SY 5301-1987 General technical specifications for carbon steel and ordinary alloy steel castings for petroleum drilling and production machinery products
Some standard content:
Standard of the Ministry of Petroleum Industry of the People's Republic of China SY 5301-87
General Technical Conditions for Carbon Steel and Ordinary Alloy Steel Castings for Oil Drilling and Production Machinery
This standard was confirmed to remain valid in 1998: Issued on April 18, 1988
Implemented on June 1, 1988
Standard of the Ministry of Petroleum Industry of the People's Republic of China General Technical Conditions for Carbon Steel and Ordinary Alloy Steel Castings for Oil Drilling and Production Machinery 1 Subject Content and Scope of Application
This standard specifies the technical conditions, inspection methods and acceptance rules for steel castings. This standard applies to various steel castings for oil drilling and production machinery products. 2 Reference standards
GB 221
GB 222
GB 228
GB 229
GB 2106
3 Technical conditions
Method for indicating steel product grades
Sampling method for specimens for chemical analysis of steel
Chemical analysis method for steel and alloys
Metal tensile test method
Metal room temperature impact toughness test method
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Metal Charpy (V-notch) impact test method 3.1 Grade, chemical composition and mechanical properties of steel castings The grade, chemical composition and mechanical properties of various steel castings shall comply with GB221 and GB222. GB223, GB228. GB 229 refer to the relevant standards
3.2 Machining allowance of steel castings
The machining allowance of various steel castings shall refer to the values specified in Table A1 and Table A2 in Appendix A. 3.3 Dimensional tolerance of steel castings
3.3.1 Code, grade and value of dimensional tolerance of steel castings The code of dimensional tolerance of steel castings is CT, and the tolerance grade is divided into 16 grades. The values of each grade of tolerance shall comply with the provisions of Table 1 and Table 2. 3.3.2 The dimensional tolerance of wall thickness and rib thickness of steel castings can be reduced by one grade compared with the general dimensional tolerance. 3.3.3 Tolerance zone position
The tolerance zone should be set symmetrically to the basic size of the steel casting. When there are special requirements, it can also be set asymmetrically, but it should be indicated on the drawing.
In the part where the design requires the inclined feature, the dimensional tolerance along the inclined surface shall be symmetrically distributed, and the tolerance value shall be selected from Table 1 and Table 2 according to the basic size of the steel casting.
3.3.4: The misalignment must be within the tolerance specified in Table 1 and Table 2. When the misalignment value needs to be further limited, it shall be noted on the drawing. The value shall be selected from Table 1, Table 2 or Table 3. The smaller value, but the value shall not be the same as the value listed in Table 1 and Table 2. 3.4 Selection of dimensional tolerance grade of steel castings
3.4.1 The dimensional tolerance grade of steel castings produced in batches and in large quantities shall comply with the provisions of Table 4. 3.4.2 The dimensional tolerance grade of steel castings produced in small batches of single pieces shall comply with the provisions of Table 5. 3.5 The quality deviation of steel castings shall comply with the provisions of Table 6. 3.6 The pouring and riser of steel castings shall generally be cut before heat treatment, and the residual amount after cutting shall not exceed the provisions of Table 7. Approved by the Ministry of Petroleum Industry of the People's Republic of China on April 18, 1988 and implemented on June 1, 1988
Basic dimensions of steel castings
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Table 1 Dimensional tolerances of steel castings
Tolerance grade CT
Note: The basic dimensions of castings are given in the casting drawing and include the rest of the work. The tolerances not specified in this table are for basic dimensions of 13
CT13 to CT16 or less or less than 6mm, which are reserved for specifications that may require more precise tolerances in the future. Their tolerance values must be individually marked and can be increased by 2.-3. Casting size tolerance values
Steel castings
Basic size size
Tolerance grade
Note: The tolerance values listed in this table are only applicable to the basic dimensions of castings less than 10mm for die castings and investment castings, 2
Casting process
Tolerance grade CT
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Misalignment value
Misalignment value. mm
Within the tolerances of Table 1 and Table 2
Table 4 Dimensional tolerance grades for batch and mass production steel castings Sand mold flat modeling
Sand mold machine modeling
Mold and shell mold
Five-piece small batch production steel castings Dimensional tolerance grades Molding materials
Nominal mass of steel castings
1001000
1001 ~ 5000
5001-- 30X00
>30000
Dry and wet sand
Quality deviation of steel castings
Positive deviation of steel castings, %
Note: (1) Grade 1 deviation is used for steel castings with strict quality requirements and batch and mass production. Grade 2 deviation is used for single and small batch production of steel castings. The nominal quality of steel castings includes the quality of castings including machining allowance and related allowance of the same production process. Investment casting
Self-hardening sand
12 ~14
The determination of nominal quality shall be based on the calculated quantity of the process. It is also allowed to be based on the actual quality of the first piece or the average quality of the first batch of castings. ③The lower deviation of the quality of steel castings can be limited by the lower deviation of the eight-inch tolerance. Except as specified in the drawings and ordering technical conditions, the quality deviation shall not be used as the basis for acceptance: the diameter of the riser or the residual height is less than
or equal to
The concave amount
is less than or equal to
The residual height is less than
or equal to
The concave amount
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Table shows the allowable deviation value of the residual amount of the pouring head of steel castings: 150
≥150～300Www.bzxZ.net
less than or equal to the machining allowance
and the residual allowance ≥3
Note: The residual height of the pouring head of low alloy steel castings after cutting is allowed to be increased by 10% compared with Table 7, but the amount of concave remains unchanged. For castings that are prone to cracks, the residual height of the riser is allowed to be appropriately increased, but it should be indicated on the process drawing. When there are special requirements for the residual amount of pouring head on the non-machined surface, it should be indicated in the drawing. mm
3.7 The surface of steel castings should be smooth and flat, and the molding sand, core sand, oxide scale, meat and scars should be cleaned up. 3.8 The flash, anti-crack ribs and chill iron on the surface of the casting should be chiseled until they are basically flush with the surface of the casting. The anti-crack ribs in the inner cavity of the steel casting that do not affect the use, appearance and assembly of the parts do not need to be removed. 3 .9 Repair welding is allowed for defects in steel castings, but it should be carried out before the final heat treatment. The scope and requirements of the repair welding shall be implemented in accordance with relevant standards and process specifications.
3.10 All steel castings need heat treatment. If there is no special requirement when ordering, the heat treatment process shall be determined by the manufacturer. 4 Test methods and acceptance rules
4.1 Casting test blocks
4.1.1 Casting test blocks for chemical analysis shall be made in the middle of pouring. 4.1.2 Test blocks for mechanical properties shall be cast separately or attached to the main body in the middle of pouring. If there is no requirement from the purchaser, the selection of test blocks shall be determined by the manufacturer. The main dimensions and cutting positions of the single casting test blocks shall comply with the requirements of the single casting test blocks for mechanical properties (Figure 1, Figure 2, Figure 3). The location of the attached casting test blocks shall be agreed upon by both parties.
4.1.3 If there is no special requirement when ordering, the thickness of the sampling position of the mechanical properties test blocks shall be 28mm. 4.2 Test methods
4.2.1 Chemical analysis sampling method shall be carried out in accordance with the provisions of GB222. Chemical composition arbitration analysis shall be carried out in accordance with the provisions of GB223. 4.2.2 Tensile test shall be carried out in accordance with the provisions of GB228. The diameter of the specimen is 10mm and the gauge length is 50mm. When the specimen is cut from the casting, the diameter of the specimen can be 5mm and the gauge length is 25mm. Impact toughness test shall be carried out in accordance with the provisions of GB2106. 4.3 Acceptance rules
4.3.1 The steel parts shall be inspected and accepted by the technical inspection department of the manufacturer. However, the purchaser has the right to re-inspect according to the items specified in the order contract.
The chemical composition of steel shall be inspected furnace by furnace according to the melting furnace, and the chemical composition of various types of steel shall comply with the provisions of Article 3.1. 4.3.24
4.3.3 The test blocks for mechanical properties shall be heat treated with the castings they represent. For cast steel grades with stable quality, the test blocks and castings are allowed to be heat treated separately.
4.3.3.1 When a batch of castings of different grades but different smelting furnaces are heat treated in the same furnace, they should be inspected according to each smelting furnace. 4.3.3.2 When a batch of steel castings of the same smelting furnace are heat treated in separate furnaces under the conditions of fixed heat treatment process and stable quality, random inspection is allowed.
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4.3.3.3 When the capacity of the smelting furnace is less than or equal to 500kg, under the conditions of stable smelting process. Steel castings of the same grade can be treated as a batch of castings of the same smelting furnace. 4.3.4 All types of steel castings shall be tested for the following mechanical properties according to the melting furnace. Carbon steel: yield strength, tensile strength, elongation, section shrinkage or impact toughness. Alloy steel: yield strength, tensile strength: elongation, section shrinkage, impact toughness. Each test shall use one tensile test specimen and three impact test specimens, >220
-
4.3.4.1 The results of the tensile test shall comply with the provisions of Article 3.1: The half-mean of the impact test results shall comply with the provisions of Article 3.1, and any of the three impact values shall not be less than two-thirds of the specified value. 4.3.4.2 When the results of the tensile test and impact test are lower than the specified values in Article 4.3.4.1, the test items shall be retested. 4.3.4.3 For the retest of the tensile test, two spare specimens shall be taken from the same batch for testing. If one of them fails to meet the requirements of Article 3.1, the castings of this batch shall be reheat treated. 4.3.4.4 For the retest of the impact toughness, three spare specimens shall be taken from the same batch for testing, and the requirements of Article 4.3.4.1 shall be met. The result shall be added to the original result and the average value shall be recalculated. The new average value shall meet the requirements of Article 3.1, otherwise the castings of this batch shall be reheat treated. 4.3.4.5 Without the consent of the purchaser, the number of reheat treatments shall not exceed two times (except tempering). 4.3.4.6 The reheat treatment of the key casting shall be carried out in accordance with the provisions of Article 4.3.3, and then all mechanical property tests shall be carried out in accordance with the provisions of Article 4.3.4. 4.3.5 If the test specimen fails due to casting defects, machining, heat treatment, etc., the test shall be deemed invalid and another spare specimen shall be taken for inspection.
4.3.6 When spare specimens are insufficient, it is allowed to cut from the steel casting or from the rough section of the specimen. The cutting position is determined by the manufacturer, and the test results are valid for the batch of steel castings represented. 5 Factory mark and certificate of conformity
5.1 The qualified steel casting shall be marked with a qualified mark on the outer surface of the casting by the competent department of the manufacturer. 5.2 Steel castings shall be accompanied by a quality certificate issued by the manufacturer before leaving the factory. The casting quality certificate shall include the following contents: @Manufacturer name or code; 2Casting drawing number or part number: 3Casting steel grade: 4Smelting furnace number, chemical composition and mechanical properties, 5Standard number. In addition to the above items, the casting qualification certificate shall also be accompanied by the test results of the items if there are special provisions in the order technical conditions.
Parts maximum size
120-260
260~360
>360~500
2 500--800
>800-[250
2 1250~ 200
2000~3150
>3150~ 5000
Position during pouring
Bottom side
Bottom side
Bottom side
Bottom side
Bottom side
Bottom side
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Appendix A
Machining allowance of steel castings
(reference part)
Machining allowance of steel castings with grade 1 precision
Part base
>120 ～>260
≤120
～630
≥800
Machining allowance of steel castings with grade 1 precision
Part maximum size porcelain injection position≤120
> 120～260
?260~360
>360~500
>500～800
>800~1250
1250-2000
>2000 ~3150
>3150 ~ 5000
> 5(H0--8(0
Bottom and side
Bottom side
Bottom side
~260
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Machining allowance of steel castings with grade II precision
260/360500
>1250>
2315025000>6300
Machining allowance of steel castings with grade T precision
~5000~6300~8000
Note: (1 Basic dimensions of parts are the dimensions given on the part drawing, excluding mechanical machining allowance. The basic dimensions of parts in the table are allowed to be selected according to the maximum dimensions of the parts.
②For steel castings requiring grade II precision, it should be specified in the drawings or ordering technical conditions. For the same casting, Different parts of the casting are allowed to use different accuracy levels.
The machining allowance of the hole is generally the top surface machining allowance, but when there are more than two holes in a row on the steel casting and the center distance is large, the allowance is allowed to be larger.
① For steel castings with high requirements for surface roughness, as well as parts with high technical requirements such as gears and cylinders, and large castings that require rough machining and heat treatment, the machining allowance can be appropriately increased.
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For steel castings with complex shapes and easy deformation, in order to compensate for bending deformation, the allowance can be appropriately increased. @The machining allowance of extra-large steel castings is allowed to be appropriately increased. Additional remarks:
This standard was proposed by the Professional Standardization Technical Committee for Petroleum and Natural Gas Exploration and Development Equipment and Materials of the Ministry of Petroleum Industry. This standard was drafted by Baoji Petroleum Machinery Factory. The responsible drafters of this standard are Wu Dongxian and Ma Zhonghai. This standard remains valid after the review in 199, and the review result has been approved by the State Administration of Petroleum and Chemical Industry.2 Steel castings shall be accompanied by a quality certificate issued by the manufacturer before leaving the factory. The casting quality certificate shall include the following contents: @Manufacturer name or code;
2 Casting drawing number or part number:
() Cast steel grade:
Melting furnace number, chemical composition and mechanical properties, 5 Standard number.
In addition to the above items, the casting quality certificate shall also be accompanied by the test results of the items if there are special provisions in the ordering technical conditions.
Parts maximum size
120-260
260~360
>360~500
2 500--800
>800-[250
2 1250~ 200
2000~3150
>3150~ 5000
Position during pouring
Bottom side
Bottom side
Bottom side
Bottom side
Bottom side
Bottom side
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Appendix A
Machining allowance of steel castings
(reference part)
Machining allowance of steel castings with grade 1 precision
Part base
>120 ～>260
≤120
～630
≥800
Machining allowance of steel castings with grade 1 precision
Part maximum size porcelain injection position≤120
> 120～260
?260~360
>360~500
>500～800
>800~1250
1250-2000
>2000 ~3150
>3150 ~ 5000
> 5(H0--8(0
Bottom and side
Bottom side
Bottom side
~260
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Machining allowance of steel castings with grade II precision
260/360500
>1250>
2315025000>6300
Machining allowance of steel castings with grade T precision
~5000~6300~8000
Note: (1 Basic dimensions of parts are the dimensions given on the part drawing, excluding mechanical machining allowance. The basic dimensions of parts in the table are allowed to be selected according to the maximum dimensions of the parts.
②For steel castings requiring grade II precision, it should be specified in the drawings or ordering technical conditions. For the same casting, Different parts of the casting are allowed to use different accuracy levels.
The machining allowance of the hole is generally the top surface machining allowance, but when there are more than two holes in a row on the steel casting and the center distance is large, the allowance is allowed to be larger.
① For steel castings with high requirements for surface roughness, as well as parts with high technical requirements such as gears and cylinders, and large castings that require rough machining and heat treatment, the machining allowance can be appropriately increased.
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For steel castings with complex shapes and easy deformation, in order to compensate for bending deformation, the allowance can be appropriately increased. @The machining allowance of extra-large steel castings is allowed to be appropriately increased. Additional remarks:
This standard was proposed by the Professional Standardization Technical Committee for Petroleum and Natural Gas Exploration and Development Equipment and Materials of the Ministry of Petroleum Industry. This standard was drafted by Baoji Petroleum Machinery Factory. The responsible drafters of this standard are Wu Dongxian and Ma Zhonghai. This standard remains valid after the review in 199, and the review result has been approved by the State Administration of Petroleum and Chemical Industry.2 Steel castings shall be accompanied by a quality certificate issued by the manufacturer before leaving the factory. The casting quality certificate shall include the following contents: @Manufacturer name or code;
2 Casting drawing number or part number:
() Cast steel grade:
Melting furnace number, chemical composition and mechanical properties, 5 Standard number.
In addition to the above items, the casting quality certificate shall also be accompanied by the test results of the items if there are special provisions in the ordering technical conditions.
Parts maximum size
120-260
260~360
>360~500
2 500--800
>800-[250
2 1250~ 200
2000~3150
>3150~ 5000
Position during pouring
Bottom side
Bottom side
Bottom side
Bottom side
Bottom side
Bottom side
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Appendix A
Machining allowance of steel castings
(reference part)
Machining allowance of steel castings with grade 1 precision
Part base
>120 ～>260
≤120
～630
≥800
Machining allowance of steel castings with grade 1 precision
Part maximum size porcelain injection position≤120
> 120～260
?260~360
>360~500
>500～800
>800~1250
1250-2000
>2000 ~3150
>3150 ~ 5000
> 5(H0--8(0
Bottom and side
Bottom side
Bottom side
~260
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Machining allowance of steel castings with grade II precision
260/360500
>1250>
2315025000>6300
Machining allowance of steel castings with grade T precision
~5000~6300~8000
Note: (1 Basic dimensions of parts are the dimensions given on the part drawing, excluding mechanical machining allowance. The basic dimensions of parts in the table are allowed to be selected according to the maximum dimensions of the parts.
②For steel castings requiring grade II precision, it should be specified in the drawings or ordering technical conditions. For the same casting, Different parts of the casting are allowed to use different accuracy levels.
The machining allowance of the hole is generally the top surface machining allowance, but when there are more than two holes in a row on the steel casting and the center distance is large, the allowance is allowed to be larger.
① For steel castings with high requirements for surface roughness, as well as parts with high technical requirements such as gears and cylinders, and large castings that require rough machining and heat treatment, the machining allowance can be appropriately increased.
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For steel castings with complex shapes and easy deformation, in order to compensate for bending deformation, the allowance can be appropriately increased. @The machining allowance of extra-large steel castings is allowed to be appropriately increased. Additional remarks:
This standard was proposed by the Professional Standardization Technical Committee for Petroleum and Natural Gas Exploration and Development Equipment and Materials of the Ministry of Petroleum Industry. This standard was drafted by Baoji Petroleum Machinery Factory. The responsible drafters of this standard are Wu Dongxian and Ma Zhonghai. This standard remains valid after the review in 199, and the review result has been approved by the State Administration of Petroleum and Chemical Industry.
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