SY 5302-1987 General technical requirements for grey iron castings for petroleum drilling and production machinery products
Some standard content:
Ministry of Petroleum Industry of the People's Republic of China Standard SY5302-87
This standard was confirmed to be valid in 1998, and this is hereby stated. General Technical Specifications for Gray Iron Castings for Oil Drilling and Production Machinery Products
Published on April 18, 1988
Ministry of Petroleum Industry of the People's Republic of China
Implementation on June 1, 1988
1 Main Content and Scope of Application
Ministry of Petroleum Industry of the People's Republic of China Standard General Technical Specifications for Gray Iron Castings for Oil Drilling and Production Machinery Products
SY 5302-87
1.1 This standard specifies the various quality indicators of gray iron castings, as well as the various contents of their inspection, transfer and acceptance. 1.2 This standard applies to ordinary or low-alloy gray iron castings for oil drilling and production machinery with tensile strength as the main test performance. Any special requirements for products should be indicated in the corresponding drawings or relevant technical documents. 2. Grades and properties
Gray iron castings for oil drilling machinery, the grades of tensile strength classification of single cast test bars are shown in Table 1. Qiu 1
Note, (1) *HT" refers to the first letter of the Chinese pinyin of the word "grey". The tensile strength ob is greater than or equal to, N/mm
(2) Under stable production conditions, HT100 and HT150 gray iron castings are exempted from mechanical performance inspection. (3) During acceptance, the tensile strength of the gray iron of the grade should be within the range of (can be +100) N/mm. 2.1.1 General mechanical properties, under the premise of stable production, the test sample needs to be cast in a group of at least three bars in the dry mold by vertical casting with the same batch of molten iron from the same furnace and the same grade.
2.1.2 Modeling materials for test pieces (including sand particle size and adhesive The binder) should be similar to or consistent with the casting mold material. The molten iron used for pouring should be representative, and the initial, ladle or boundary molten iron should not be used for pouring. The single casting test bar is shown in Figure 1.
2.1.3 Generally, the parts cast from the same ladle of molten iron are a batch; the sampling method for the single test bar is as follows: a, for each casting weight of 2t of cast iron of grade HT200 or above (including HT200) or castings with a pouring weight of 1.5-2.0t, a group of samples should be taken.
b, for the same grade of molten iron, if the iron is continuously tapped for 2 times, a sample should be taken for individual inspection at least once. c, for mass production, under the premise of the most stable quality, the discarded grade of cast iron should be spot-checked at least once per furnace. 2 .1.4 When more than one batch of molten iron (from different furnaces or ladle) is used to cast the same casting, each batch of molten iron shall meet the requirements of this standard and be inspected separately.
SY5302-87
Approved by the Ministry of Petroleum Industry of the People's Republic of China on April 18, 1988 and implemented on June 1, 1988. 2.1.5 When the specimen is damaged or defective according to the regulations, it is allowed to cut the specimen from the actual casting or other attached casting parts to determine its properties. 2.1.6 For castings with special requirements, it is allowed to use attached casting test bars (blocks) or other sampling methods , but it should be indicated in the drawings or relevant technical documents.
2.1.7 The test drop should have the same sand falling temperature as the casting: the test bar should be unpacked after it turns black. When the casting needs to be subjected to non-aging heat treatment, the test bar should be heat treated together with the casting, and the position should be consistent with the heat treatment conditions of the casting.
2.1.8 Each test bar should be marked.
2.2 The tensile strength of general castings should be based on the tensile strength of the tensile test specimen processed by single casting test lifting as the acceptance basis, and shall be carried out in accordance with the provisions of GB977 "Test Methods for Mechanical Properties of Gray Cast Iron". The tensile test specimens used are shown in Figures 2 and 3. 扎金
SY 5302-—B7
Note: The length of the sample is the minimum length 30
The rest is 12.5
2.2.1 At least one sample should be taken from each batch of castings for tensile test. If the tensile strength of this sample is qualified, the mechanical properties of this batch of castings are qualified. If the test result is unqualified, two samples from the same batch or group of samples should be taken for re-testing, and the test results must all be qualified. If one of them is unqualified, the mechanical properties of this batch of castings are not qualified. 2.2.2 If the test result is unqualified due to the following reasons during the test, the test is invalid. 2.2.2.1 The sample is improperly installed on the testing machine or improperly operated. 2.2.2.2 The sample is defective or the sample is improperly cut. 2.2.2.3 The sample is broken outside the parallel section.
2.2.2.4 There are casting defects on the fracture of the sample. 2.2.2.5 The testing equipment is faulty.
2.2.3 When castings need to be subjected to deflection, flexibility or other special tests, this should be noted in the drawings or relevant technical documents. 2.2.4 When the thickness of the main surface of the casting (8) is not more than 4mm or more than 50mm, its performance or sampling method should be agreed upon separately. 2.3 For castings with hardness requirements, the test should generally be conducted at the end of the tensile test specimen. If hardness measurement is required on the casting, the test location should be noted in the drawings or relevant technical documents. The surface layer with a thickness of not less than 2mm should be cut off. 2.3.1 The rough hardness of the machined surface of the casting should generally be controlled below the hardness HB255. 2.3.2 When there are no special requirements, the non-machined surface of the casting is generally not subjected to impact hardness inspection. 2.3.3 The Brinell hardness inspection of gray iron castings should be carried out in accordance with the requirements of GB231 "Metal Brinell Hardness Test Method". 2.4 When the mechanical properties of the castings fail to meet the requirements, heat treatment is allowed. If necessary, some alloy elements may be added to ensure the castings meet the requirements for microstructure or other special use conditions. 3 Metallographic structure and chemical composition
3.1 The chemical composition of general gray iron castings is determined by each production unit. When there are no special requirements, they should generally be subject to tensile strength and not be used as the basis for acceptance of castings. It is only used as a reference to ensure mechanical properties, improve ingredients and control quality. 3.2 Chemical analysis samples, in principle, take white ladles. When necessary, take samples of castings, and allow the use of spectral analysis technology for measurement. However, spectral analysis technology shall not be used as a tailor-made analysis. 3.3 The metallographic structure of carbon cast iron parts shall not be inspected. When there are special requirements, they can be inspected according to GB7216 "Gray Cast Iron Metallography".
4 Casting cleaning and appearance quality
4.1 The appearance quality of castings should be inspected one by one.
The user has the right to provide samples to the production unit. SY5302—87
4.1.1 The mold sand and core sand on the casting should be removed cleanly, and the gate, fleshy, scars, etc. should be scraped off and smoothed. 4.1.2 The residual traces after the riser is removed are allowed to be convex or concave 1.5mm on the non-machined surface if it does not affect the appearance and performance. On the machined surface, it should comply with the provisions of Table 2.
Chen Wu Fanxue
Out, mm
Not more than 2/3 of the machining allowance at that place, and ensure that there is no less than 2mm11 machining allowance
4.1.3 The misshape value of the casting should not exceed one-half of the machining allowance at that place on the machined surface, and there should be no less than 2mm plus two allowances. On the non-machined surface, it should comply with the provisions of Table 3. Rough non-machined base push surface, no misshape traces shall be found. Table
Note: (") If necessary, the misalignment value can be adjusted appropriately, and the value of
is within the tolerance of Table 5, mm
(2) When there are special requirements, the maximum allowable misalignment value should be indicated in the drawings or relevant technical documents. For example, the tolerance grade of this standard is CT10, and the maximum misalignment value is 1.0mm.
4.1.4 Misalignment marks on non-processed surfaces should be polished and smoothed. 4.2 The roughness of the casting surface should be evaluated in accordance with GB6060.1 "Casting surface of surface roughness comparison sample". 4.2.1 Different surfaces of the same casting are allowed to have different roughness levels. 4.2.2 The evaluation of the casting surface roughness is based on the "main casting surface" as the acceptance condition. The "main casting surface" refers to the non-processed surface and the largest surface to be processed that affects the appearance and performance of the inner and outer surfaces of the casting. The roughness of non-"main casting surfaces" is allowed to be reduced by one level for inspection. 4.2 .3 The casting surface roughness of the casting shall be indicated in the corresponding drawings or relevant technical documents. Otherwise, it shall be accepted according to the parameter value R50. See Table 4.
and inspection.
"Casting surface roughness comparison sample" needs to be well preserved and shall not be damaged, rusted or oily, and shall be checked regularly as appropriate. 4.2.5 Casting surface roughness refers to the microscopic geometric characteristics composed of small interval peaks and valleys on the casting surface caused by non-casting defects. It is generally less than Alloy material, casting process and cleaning method. 4
Roughness parameters
, nominal values
Shell casting!
Sand casting
Investment casting
Shell casting
Sand casting
$Y5302-87
Note, (1) ×× is the roughness that can be achieved by taking special measures. (2) Yanzhang indicates the roughness that can be achieved, steam
4.3 Except for defects that are permitted to exist or removed by processing, castings shall not have defects such as cracks, pores, slag inclusions, cold shuts and spots that affect strength, appearance, workability and performance. 4.3.1 In the pressure-bearing parts of castings, defects such as sparseness and sand limit shall not be found, and airtight pressure leakage shall not occur. The airtightness test shall fully consider the properties of the medium and its pressure holding pressure and time. 4.3.2 Non-destructive testing shall be carried out on important load-bearing parts and load-bearing parts. 4.3.3 Castings that can still be repaired and have repair value shall be repaired according to regulations, and the repair scope and requirements of defects for key parts shall be clearly specified.
Parts Dimension Tolerances
The geometrical dimension tolerances of castings are shown in Table 5.
5.1 Once the dimensional tolerance accuracy level of castings is determined, it shall be indicated in the drawings or relevant technical documents, otherwise it shall be accepted according to CT9 level. For castings produced by dry molds and hand molding, when the tolerance level is not marked, they should be accepted according to CT11 level. Different parts of the same casting are allowed to use different accuracy levels, but it should be noted. 5.1.1 The "main dimensions" marked on the drawing should be used as the acceptance criteria for the inspection of casting dimensions. In the first inspection of castings, in addition to the line-checking of its "main dimensions" item by item, all dimensions should be evaluated. 5.1.2 The inspection of the "main dimensions" of castings should be noted in the drawings or relevant technical documents. Its "main dimensions" refer to the processing and non-processing dimensions related to assembly that affect processing and performance. 5.1.3 The dimensional tolerance values of castings should be distributed symmetrically in half. If there are special requirements, asymmetrical distribution is allowed, but it should be noted. 5.1.4 For parts with generally stable quality, the inspection department shall conduct random inspections regularly or in batches, with a random inspection rate of 2%, but not less than three pieces. 5.2 For the inspection of non-"main dimensions" and wall thickness and rib thickness of castings, the dimensional tolerance values are allowed to be reduced by one level. Important castings with complex inner cavities should be dissected and inspected regularly. 5.3 The error caused by the misshape value should be within the corresponding dimensional tolerance range and should not be added to the corresponding tolerance value. The geometric dimension deviation caused by the casting draft is not calculated as deviation. 5.4 The casting fillet not specified in the drawing shall be made according to R3~~5mm. 6 Acceptance of first piece and rejection of castings
The user has the right to inspect the first piece. Products with reliable quality are allowed to be exempted from inspection, but the user has the right to re-inspect the quality of the castings. The re-inspection 5
Basic dimensions
$Y 5302—87
Table 5 Casting dimensional tolerance values
Note: (1) CT is the abbreviation of Casting Tolerances. 1.5
(2) The tolerance values of CT1 and CT2 are not specified, which is reserved for more precise tolerances. The quantity and method should be explained in the relevant technical documents. 10
Note: The first piece is the first piece or the first batch of products produced by the operator, production object or manufacturing process (including tooling). 13
6.1 When the part does not meet the requirements of the specified material grade, the geometric size is out of tolerance or has other defects, and seriously affects the processing and use performance of the casting, it can be collected.
Other
Castings should be treated to eliminate internal stress and soften annealing when necessary, but it should be indicated in the relevant technical documents. 7.1
2The surface of the casting should be painted with red primer, and the heated parts. The fully machined parts and the large machined surfaces of the sky castings are allowed not to be painted with red primer. 7.3 The weight deviation of castings should be controlled. When there is no special requirement, it shall not be used as the acceptance basis of castings, but can be used as technical data control for economic benefits and quality stability.
7.4 For large castings, important castings should be marked with "marks", "reduction numbers", etc. on their non-machined surfaces, and the data should be kept for inspection.
7.5 When the standards cited in this standard are revised, the newly revised standards should be implemented.
For castings to be transferred out, the quality certificate should be filled out piece by piece or in batches and submitted to the user for acceptance, which should indicate +a: casting drawing number, name and quantity.
b: material brand (including batch number, furnace number). c. Inspection results and this standard number.
d, casting transfer date.
sY 5302--87
Appendix A
Expected Mechanical Properties of Castings
(Supplement)
The expected mechanical properties of grey iron castings of different wall thicknesses are shown in the following table.
Casting thickness,
less than or equal to
Tensile strength ob greater than or equal to, N/mm
Note: (1) The values listed in this table are of reference value only when the iron grade is fixed, the casting wall thickness is uniform and the shape is simple. Otherwise, they can only provide approximate tensile strength values at different wall thicknesses. (2) If the supply and demand parties agree, samples can also be taken from the castings with the above properties to determine their tensile strength values as the basis for acceptance. 7
$Y5302—87
Appendix B
Selection of casting dimension tolerances
(Supplement)
The recommended grades of casting dimension tolerances are shown in the following table. Process
Mallet cast iron
Aluminum alloy
11～14
11~～13
(1) For castings produced in small batches, F molds or hand molding processes are generally used. Note:
(2) When the basic size of the casting is ≤10mm, its tolerance grade is increased by three grades, when the basic size of the casting is >10～16mm, its tolerance grade is increased by two grades, and when the basic size of the casting is >16～25mm, its tolerance grade is increased by one grade. 8
SY5302-87
Attached test bar (block)
(Supplement)
The attached test bar (block) of castings is shown in Figure C1 and Figure C2. 3050bzxz.net
Attached test bar in Figure C1
Note: (1) The strength of HT100 grade grey iron castings is too low in thick sections and has no practical value. (2) When the wall thickness of the casting exceeds 300mm, the total mechanical properties shall be determined by the supplier and the buyer. (3) The mechanical properties of the test piece (block) attached shall be in accordance with GB5675 Grey Cast Iron Classification, 50
Figure C2 Attached test block
R15(R25)
The recommended draft angle of castings is shown in the table below
Die height H, mm
>18~50
>60-120
>120250
>250~100
>400-630
>830-1000
$Y 5302—87
Appendix D
Starting slope
(reference)
Note: (1) Type A increases thickness and is used for thin-walled or surface-processed castings, and Type C reduces thickness and is used for thick-walled castings (2) Self-contained sand holes, generally the height should be smaller than the width or diameter, and the mold draft rate on each side is 3. (3) The process is relatively mature and metal molds are used. When machine molding, the mold draft should be taken at a lower value, 10
0°24"
Gray cast iron is used for chemical composition. See the table below
Gray cast magnesium
Cast iron raw materials
Wall thickness, mm
SY5302-87
Appendix E
Chemical composition
(reference)
Additional notes:
This standard is proposed by the Machinery Manufacturing Department of the Petroleum Industry Belt. S
1 -8 ~2., 2
fen,duo
0,B～1,0
.D~1.2
This standard is under the jurisdiction of the Standardization Institute of Petroleum Exploration and Development Materials Research Institute of the Ministry of Petroleum Industry. This standard was drafted by Jinan Diesel Engine Factory and the responsible drafter of this standard was Zhang Tiemei.2. The inspection of the "main dimensions" of castings shall be indicated in the drawings or relevant technical documents. The "main dimensions" refer to the processed and non-processed dimensions related to assembly that affect processing and performance. 5.1.3 The dimensional tolerance values of castings shall be distributed symmetrically in half. When there are special requirements, asymmetrical distribution is allowed, but it shall be indicated. 5.1.4 For parts with generally stable quality, the inspection department shall conduct random inspections regularly or in batches, with a random inspection rate of 2%, but not less than three pieces. 5.2 For the inspection of non-"main dimensions" of castings and wall thickness and rib thickness, the dimensional tolerance values are allowed to be reduced by one level for selection. Important castings with complex inner cavities shall be dissected and inspected regularly. 5.3 The error caused by the misshapen value shall be within the corresponding dimensional tolerance range and shall not be added to the corresponding tolerance value. The geometric dimension deviation caused by the draft angle of the casting shall not be calculated as deviation. 5.4 Casting fillets not indicated in the drawings shall be made according to R3~~5mm. 6 Acceptance of first piece and rejection of castings
The user has the right to inspect the first piece. Products with good quality are exempted from inspection, but the user has the right to re-inspect the quality of the castings. The re-inspection is 5
Basic dimensions
$Y 5302—87
Table 5 Casting dimension tolerance values
Note: (1) CT is the abbreviation of Casting Tolerances. 1.5
(2) The tolerance values of CT1 and CT2 are not specified, which is reserved for more precise tolerances. The number and method should be explained in the relevant technical documents. 10
Note, the first piece is the first piece or the first batch of products produced by the operator, production object or manufacturing process (including tooling), 13
6,1 When the piece does not meet the specified material grade requirements, the geometric size is out of tolerance or has other defects, and seriously affects the processing and use performance of the casting, it can be accepted.
Other
Castings should be treated to eliminate internal stress, and soften annealing should be performed when necessary, but it should be noted in the relevant technical documents. 7.1
2 The surface of the casting should be painted with red primer, and the heated parts. The large machined surface of the fully machined parts and the day castings is not allowed to be painted with red primer. 7.3 The weight deviation of the casting should be controlled. When there is no special requirement, it shall not be used as the acceptance basis for casting, but can be used as technical data control for economic benefits and quality stability.
7.4 For large castings, important castings should be marked with "marks", "reduction numbers", etc. on their non-machined surfaces, and the data should be kept for reference.
7.5 When the standards cited in this standard are revised, the newly revised standards should be followed.
7.6 For castings to be transferred out, quality certificates should be filled out piece by piece or in batches and submitted to the user for acceptance, which should indicate +a: casting drawing number, name and quantity.
b: material brand (including batch number, furnace number).
d: date of transfer of castings.
sY 5302--87
Appendix A
Expected Mechanical Properties of Castings
(Supplement)
The expected mechanical properties of grey iron castings of different wall thicknesses are shown in the following table.
Casting thickness,
less than or equal to
Tensile strength ob greater than or equal to, N/mm
Note: (1) The values listed in this table are of reference value only when the iron grade is fixed, the casting wall thickness is uniform and the shape is simple. Otherwise, they can only provide approximate tensile strength values at different wall thicknesses. (2) If the supply and demand parties agree, samples can also be taken from the castings with the above properties to determine their tensile strength values as the basis for acceptance. 7
$Y5302—87
Appendix B
Selection of casting dimension tolerances
(Supplement)
The recommended grades of casting dimension tolerances are shown in the following table. Process
Mallet cast iron
Aluminum alloy
11～14
11~～13
(1) For castings produced in small batches, F molds or hand molding processes are generally used. Note:
(2) When the basic size of the casting is ≤10mm, its tolerance grade is increased by three grades, when the basic size of the casting is >10～16mm, its tolerance grade is increased by two grades, and when the basic size of the casting is >16～25mm, its tolerance grade is increased by one grade. 8
SY5302-87
Attached test bar (block)
(Supplement)
The attached test bar (block) of castings is shown in Figure C1 and Figure C2. 3050
Attached test bar in Figure C1
Note: (1) The strength of HT100 grade grey iron castings is too low in thick sections and has no practical value. (2) When the wall thickness of the casting exceeds 300mm, the total mechanical properties shall be determined by the supplier and the buyer. (3) The mechanical properties of the test piece (block) attached shall be in accordance with GB5675 Grey Cast Iron Classification, 50
Figure C2 Attached test block
R15(R25)
The recommended draft angle of castings is shown in the table below
Die height H, mm
>18~50
>60-120
>120250
>250~100
>400-630
>830-1000
$Y 5302—87
Appendix D
Starting slope
(reference)
Note: (1) Type A increases thickness and is used for thin-walled or surface-processed castings, and Type C reduces thickness and is used for thick-walled castings (2) Self-contained sand holes, generally the height should be smaller than the width or diameter, and the mold draft rate on each side is 3. (3) The process is relatively mature and metal molds are used. When machine molding, the mold draft should be taken at a lower value, 10
0°24"
Gray cast iron is used for chemical composition. See the table below
Gray cast magnesium
Cast iron raw materials
Wall thickness, mm
SY5302-87
Appendix E
Chemical composition
(reference)
Additional notes:
This standard is proposed by the Machinery Manufacturing Department of the Petroleum Industry Belt. S
1 -8 ~2., 2
fen,duo
0,B～1,0
.D~1.2
This standard is under the jurisdiction of the Standardization Institute of Petroleum Exploration and Development Materials Research Institute of the Ministry of Petroleum Industry. This standard was drafted by Jinan Diesel Engine Factory and the responsible drafter of this standard was Zhang Tiemei.2. The inspection of the "main dimensions" of castings shall be indicated in the drawings or relevant technical documents. The "main dimensions" refer to the processed and non-processed dimensions related to assembly that affect processing and performance. 5.1.3 The dimensional tolerance values of castings shall be distributed symmetrically in half. When there are special requirements, asymmetrical distribution is allowed, but it shall be indicated. 5.1.4 For parts with generally stable quality, the inspection department shall conduct random inspections regularly or in batches, with a random inspection rate of 2%, but not less than three pieces. 5.2 For the inspection of non-"main dimensions" of castings and wall thickness and rib thickness, the dimensional tolerance values are allowed to be reduced by one level for selection. Important castings with complex inner cavities shall be dissected and inspected regularly. 5.3 The error caused by the misshapen value shall be within the corresponding dimensional tolerance range and shall not be added to the corresponding tolerance value. The geometric dimension deviation caused by the draft angle of the casting shall not be calculated as deviation. 5.4 Casting fillets not indicated in the drawings shall be made according to R3~~5mm. 6 Acceptance of first piece and rejection of castings
The user has the right to inspect the first piece. Products with good quality are exempted from inspection, but the user has the right to re-inspect the quality of the castings. The re-inspection is 5
Basic dimensions
$Y 5302—87
Table 5 Casting dimension tolerance values
Note: (1) CT is the abbreviation of Casting Tolerances. 1.5
(2) The tolerance values of CT1 and CT2 are not specified, which is reserved for more precise tolerances. The number and method should be explained in the relevant technical documents. 10
Note, the first piece is the first piece or the first batch of products produced by the operator, production object or manufacturing process (including tooling), 13
6,1 When the piece does not meet the specified material grade requirements, the geometric size is out of tolerance or has other defects, and seriously affects the processing and use performance of the casting, it can be accepted.
Other
Castings should be treated to eliminate internal stress, and soften annealing should be performed when necessary, but it should be noted in the relevant technical documents. 7.1
2 The surface of the casting should be painted with red primer, and the heated parts. The large machined surface of the fully machined parts and the day castings is not allowed to be painted with red primer. 7.3 The weight deviation of the casting should be controlled. When there is no special requirement, it shall not be used as the acceptance basis for casting, but can be used as technical data control for economic benefits and quality stability.
7.4 For large castings, important castings should be marked with "marks", "reduction numbers", etc. on their non-machined surfaces, and the data should be kept for reference.
7.5 When the standards cited in this standard are revised, the newly revised standards should be followed.
7.6 For castings to be transferred out, quality certificates should be filled out piece by piece or in batches and submitted to the user for acceptance, which should indicate +a: casting drawing number, name and quantity.
b: material brand (including batch number, furnace number).
d: date of transfer of castings.
sY 5302--87
Appendix A
Expected Mechanical Properties of Castings
(Supplement)
The expected mechanical properties of grey iron castings of different wall thicknesses are shown in the following table.
Casting thickness,
less than or equal to
Tensile strength ob greater than or equal to, N/mm
Note: (1) The values listed in this table are of reference value only when the iron grade is fixed, the casting wall thickness is uniform and the shape is simple. Otherwise, they can only provide approximate tensile strength values at different wall thicknesses. (2) If the supply and demand parties agree, samples can also be taken from the castings with the above properties to determine their tensile strength values as the basis for acceptance. 7
$Y5302—87
Appendix B
Selection of casting dimension tolerances
(Supplement)
The recommended grades of casting dimension tolerances are shown in the following table. Process
Mallet cast iron
Aluminum alloy
11～14
11~～13
(1) For castings produced in small batches, F molds or hand molding processes are generally used. Note:
(2) When the basic size of the casting is ≤10mm, its tolerance grade is increased by three grades, when the basic size of the casting is >10～16mm, its tolerance grade is increased by two grades, and when the basic size of the casting is >16～25mm, its tolerance grade is increased by one grade. 8
SY5302-87
Attached test bar (block)
(Supplement)
The attached test bar (block) of castings is shown in Figure C1 and Figure C2. 3050
Attached test bar in Figure C1
Note: (1) The strength of HT100 grade grey iron castings is too low in thick sections and has no practical value. (2) When the wall thickness of the casting exceeds 300mm, the total mechanical properties shall be determined by the supplier and the buyer. (3) The mechanical properties of the test piece (block) attached shall be in accordance with GB5675 Grey Cast Iron Classification, 50
Figure C2 Attached test block
R15(R25)
The recommended draft angle of castings is shown in the table below
Die height H, mm
>18~50
>60-120
>120250
>250~100
>400-630
>830-1000
$Y 5302—87
Appendix D
Starting slope
(reference)
Note: (1) Type A increases thickness and is used for thin-walled or surface-processed castings, and Type C reduces thickness and is used for thick-walled castings (2) Self-contained sand holes, generally the height should be smaller than the width or diameter, and the mold draft rate on each side is 3. (3) The process is relatively mature and metal molds are used. When machine molding, the mold draft should be taken at a lower value, 10
0°24"
Gray cast iron is used for chemical composition. See the table below
Gray cast magnesium
Cast iron raw materials
Wall thickness, mm
SY5302-87
Appendix E
Chemical composition
(reference)
Additional notes:
This standard is proposed by the Machinery Manufacturing Department of the Petroleum Industry Belt. S
1 -8 ~2., 2
fen,duo
0,B～1,0
.D~1.2
This standard is under the jurisdiction of the Standardization Institute of Petroleum Exploration and Development Materials Research Institute of the Ministry of Petroleum Industry. This standard was drafted by Jinan Diesel Engine Factory and the responsible drafter of this standard was Zhang Tiemei.5 When the standards cited in this standard are revised, the newly revised standards shall be followed. 6 For castings to be transferred out, quality certificates shall be filled out piece by piece or in batches and submitted to the user for acceptance, which shall indicate: a. casting drawing number, name and quantity. b. material brand (including batch number and heat). c. inspection results and this standard number. d. casting transfer date.
sY 5302--87
Appendix A
Expected Mechanical Properties of Castings
(Supplement)
The expected mechanical properties of grey iron castings of different wall thicknesses are shown in the following table.
Casting thickness,
less than or equal to
Tensile strength ob greater than or equal to, N/mm
Note: (1) The values listed in this table are of reference value only when the iron grade is fixed, the casting wall thickness is uniform and the shape is simple. Otherwise, they can only provide approximate tensile strength values at different wall thicknesses. (2) If the supply and demand parties agree, samples can also be taken from the castings with the above properties to determine their tensile strength values as the basis for acceptance. 7
$Y5302—87
Appendix B
Selection of casting dimension tolerances
(Supplement)
The recommended grades of casting dimension tolerances are shown in the following table. Process
Mallet cast iron
Aluminum alloy
11～14
11~～13
(1) For castings produced in small batches, F molds or hand molding processes are generally used. Note:
(2) When the basic size of the casting is ≤10mm, its tolerance grade is increased by three grades, when the basic size of the casting is >10～16mm, its tolerance grade is increased by two grades, and when the basic size of the casting is >16～25mm, its tolerance grade is increased by one grade. 8
SY5302-87
Attached test bar (block)
(Supplement)
The attached test bar (block) of castings is shown in Figure C1 and Figure C2. 3050
Attached test bar in Figure C1
Note: (1) The strength of HT100 grade grey iron castings is too low in thick sections and has no practical value. (2) When the wall thickness of the casting exceeds 300mm, the total mechanical properties shall be determined by the supplier and the buyer. (3) The mechanical properties of the test piece (block) attached shall be in accordance with GB5675 Grey Cast Iron Classification, 50
Figure C2 Attached test block
R15(R25)
The recommended draft angle of castings is shown in the table below
Die height H, mm
>18~50
>60-120
>120250
>250~100
>400-630
>830-1000
$Y 5302—87
Appendix D
Starting slope
(reference)
Note: (1) Type A increases thickness and is used for thin-walled or surface-processed castings, and Type C reduces thickness and is used for thick-walled castings (2) Self-contained sand holes, generally the height should be smaller than the width or diameter, and the mold draft rate on each side is 3. (3) The process is relatively mature and metal molds are used. When machine molding, the mold draft should be taken at a lower value, 10
0°24"
Gray cast iron is used for chemical composition. See the table below
Gray cast magnesium
Cast iron raw materials
Wall thickness, mm
SY5302-87
Appendix E
Chemical composition
(reference)
Additional notes:
This standard is proposed by the Machinery Manufacturing Department of the Petroleum Industry Belt. S
1 -8 ~2., 2
fen,duo
0,B～1,0
.D~1.2
This standard is under the jurisdiction of the Standardization Institute of Petroleum Exploration and Development Materials Research Institute of the Ministry of Petroleum Industry. This standard was drafted by Jinan Diesel Engine Factory and the responsible drafter of this standard was Zhang Tiemei.5 When the standards referenced in this standard are revised, the newly revised standards shall be followed. .6 For castings to be transferred out, quality certificates should be filled out piece by piece or in batches and submitted to the user for acceptance, which should indicate +a: casting drawing number, name and quantity.
b: Material brand (including batch number and furnace number). c. Test results and standard number.
d, casting transfer date.
sY 5302--87
Appendix A
Expected Mechanical Properties of Castings
(Supplement)
The expected mechanical properties of grey iron castings of different wall thicknesses are shown in the following table.
Casting thickness,
less than or equal to
Tensile strength ob greater than or equal to, N/mm
Note: (1) The values listed in this table are of reference value only when the iron brand is fixed, the casting wall thickness is uniform and the shape is simple. Otherwise, they can only provide approximate tensile strength values at different wall thicknesses. (2) If both the supplier and the buyer agree, samples may be taken from the castings with the above properties to determine their tensile strength values as the basis for acceptance. 7
$Y5302—87
Appendix B
Selection of casting dimension tolerances
(Supplement)
The recommended grades of casting dimension tolerances are shown in the table below. Process
Forgeable cast iron
Aluminum alloy
11～14
11~～13
(1) For castings produced in single pieces and small batches, F-die or hand-molding processes are generally used. Note:
(2) When the basic dimension of the casting is ≤10mm, its tolerance grade is increased by three grades; when the basic dimension of the casting is >10～16mm, its tolerance grade is increased by two grades; when the basic dimension of the casting is >16～25mm, its tolerance grade is increased by one grade. 8
SY5302-87
Attached test bar (block)
(Supplement)
The attached test bar (block) of castings is shown in Figure C1 and Figure C2. 3050
Attached test bar in Figure C1
Note: (1) The strength of HT100 grade grey iron castings is too low in thick sections and has no practical value. (2) When the wall thickness of the casting exceeds 300mm, the total mechanical properties shall be determined by the supplier and the buyer. (3) The mechanical properties of the test piece (block) attached shall be in accordance with GB5675 Grey Cast Iron Classification, 50
Figure C2 Attached test block
R15(R25)
The recommended draft angle of castings is shown in the table below
Die height H, mm
>18~50
>60-120
>120250
>250~100
>400-630
>830-1000
$Y 5302—87
Appendix D
Starting slope
(reference)
Note: (1) Type A increases thickness and is used for thin-walled or surface-processed castings, and Type C reduces thickness and is used for thick-walled castings (2) Self-contained sand holes, generally the height should be smaller than the width or diameter, and the mold draft rate on each side is 3. (3) The process is relatively mature and metal molds are used. When machine molding, the mold draft should be taken at a lower value, 10
0°24"
Gray cast iron is used for chemical composition. See the table below
Gray cast magnesium
Cast iron raw materials
Wall thickness, mm
SY5302-87
Appendix E
Chemical composition
(reference)
Additional notes:
This standard is proposed by the Machinery Manufacturing Department of the Petroleum Industry Belt. S
1 -8 ~2., 2
min, duo
0,B～1,0
.D~1.2
This standard is under the jurisdiction of the Standardization Institute of Petroleum Exploration and Development Materials Research Institute, Ministry of Petroleum Industry. This standard was drafted by Jinan Diesel Engine Factory and the responsible drafter of this standard was Zhang Tiemei.
Tip: This standard content only shows part of the intercepted content of the complete standard. If you need the complete standard, please go to the top to download the complete standard document for free.