SY 5310-1987 General Specifications for Investment Castings for Petroleum Drilling and Production Machinery SY5310-1987 Standard download decompression password: www.bzxz.net

Ministry of Petroleum Industry of the People's Republic of China Standard SY5310-87
This standard was confirmed to be valid in 1998, and this is hereby stated. General Technical Conditions for Investment Castings for Petroleum Drilling Machinery Products
Published on April 18, 1988
Ministry of Petroleum Industry of the People's Republic of China
Implementation on June 1, 1988
Ministry of Petroleum Industry of the People's Republic of China Standard for Investment Castings for Petroleum Drilling Machinery Products
This standard applies to investment castings made of carbon steel and low alloy steel for petroleum drilling machinery products. 1 Definition
1.1 Investment Castings
SY 5310-87
A refractory slurry that can solidify at room temperature is applied to a consumable mold (usually paraffin or molten metal). After the slurry solidifies, the mold is removed by heating to produce a cavity. Then, the molten metal is poured into this cavity, and the metal product produced after solidification is the investment casting. 1.2 Basic dimensions of castings
The basic dimensions of castings are the dimensions given on the casting drawings, which should include machining allowances. 2 Basic provisions
Codes, grades and values ​​of casting dimensional tolerances 2.1
The code for casting dimensional tolerances is CT, and the tolerance grades are divided into 9 grades. The tolerance values ​​of each grade are listed in Table 5. 2.2 The wall thickness dimensional tolerance can be reduced by one grade compared to the general dimensional tolerance. 2.3 Tolerance zone position
The tolerance zone should be set symmetrically to the basic dimensions of the casting, that is, half of the tolerance takes positive values ​​and the other half takes negative values. When there are special requirements, asymmetric settings can also be adopted, but they should be indicated on the drawings. 3 Technical requirements
The chemical composition of carbon steel castings shall comply with the provisions of Table 1. Table
Chemical composition of carbon steel castings
0.22~-0.32
0.42~~0.52
0.50-0.80
0.60-0.80
0.50-0.80
The chemical composition of alloy steel castings shall conform to the provisions of Table 2. Cheng
.200.45
0*20~0.45
0.20-0-45
Table 2 Chemical composition of alloy steel castings
ZG40Cr
ZG 35CrMa
ZG 20CrMo
0.35-0.45l0.50--0.80f0-20~-0-40/0.80~1-10 points,
030~0-400.50~0.800-20~0.400.80-~1.100.20-~D.300.15~0.250.50~0.800.20~0-400.500.800.04-0.60Approved by the Ministry of Petroleum Industry of the People's Republic of China on April 18, 1988%
Implemented on June 1, 1988
SY5310-87
Castings should be delivered after heat treatment.
The mechanical properties of carbon steel castings after annealing, normalizing or normalizing and tempering should meet the requirements of Table 3. 3.4
The mechanical properties of alloy steel castings after normalizing and tempering shall comply with the requirements of Table 4. 3.5
Table 3 Mechanical properties of plain steel castings
Service point
ZG 40Cr
ZG 35CrMa
ZG 20CrMo
≥280
Tensile strength
au,MPa
Elongation
Mechanical properties of alloy steel castings
Tensile strength
Ob,MPa
≥600
Elongation
Sectional reduction
A,%
Sectional reduction
Rate limit,%
Impact toughness
a+J/cm2
Impact toughness
arJ/cm*
The size and geometric shape of the casting shall conform to the requirements of the casting drawing, and its dimensional tolerance shall conform to the provisions of Table 5. Table 6
Basic dimensions of castings
Tolerance values ​​of casting dimensions
131179
143~197
156～217
135180
3.7 Selection of dimension tolerances
SY5310—87
3.7.1 Table 5 does not specify the tolerance values ​​of CT1 and CT2, which is reserved for future requirements of more precise tolerances. 3.7.2 For batch and mass production of investment castings, the dimension tolerance of castings using water glass and quartz sand shell materials can be selected from CT57 grade, and the dimension tolerance of castings using ethyl silicate and corundum powder shell materials can be selected from CT4~6 grades. When the basic dimension of the casting is less than or equal to 16mm, its tolerance grade can be increased by 1~2 grades. 3.7.3 For investment castings produced in single pieces and small batches, the dimensional tolerance of castings made of water glass and quartz sand shell materials can be selected from CT68, which cannot be lower than CT9. The dimensional tolerance of castings made of ethyl silicate and corundum powder shell materials can be selected from CT5 to 7. 3.8 Casting surface quality
3.8.1 Castings are allowed to have mold parting surfaces, push rod and core head marks, but they must be within the dimensional tolerance range. Castings are allowed to have defects that can be removed by processing.
3.8.2 Castings should eliminate the pouring mouth and meet the following requirements. The non-machined surface should be flush with the casting surface, the most concave part of the machined surface should have a machining amount of no less than 0.5mm, and the highest part should protrude from the casting surface ≤3mm. 3.8.3 Castings are not allowed to have defects such as cracks, cold shuts, pores, penetrating looseness and penetrating slag inclusions. The scabs, sand sticking, long edges and scale on the inner and outer surfaces of the castings must be thoroughly removed to make the casting surface almost smooth. 3.8.4 The wheel of the casting should be clear, with distinct edges and corners. 3.8.5 On the non-processed and processed surfaces of the castings, a single hole is allowed at a distance of not less than 1.5 times the diameter of the defect from the wheel edge, and its maximum depth is allowed to be within the provisions of Table 6, but not more than 1/4 of the wall thickness, and there is no similar defect at the corresponding position on the reverse side. The size and number of allowable defects of castings are shown in Table 6. Table 6 Size and number of defects allowed in chain parts Maximum diameter of armored parts True hole diameter, mm Go--100 100~260 260~400 Hole depth Wall thickness>6mm Number of holes, pieces/10cm* Concentrated defects Spacing; length Number allowed, Note: ① On the non-machined and machined surfaces of castings, single holes with a diameter less than or equal to 0.5mm and a depth less than 0.3mm are not treated as defects. ③ Concentrated defects refer to surface looseness, scars and dense small holes with a diameter of 5mm. The distance between the concentrated defects and another defect is
.
3.9 Casting defects are allowed to be repaired by welding, but it must be approved by the technical inspection department under the premise of ensuring the performance and appearance quality. Repair welding of castings should be carried out before the final heat treatment. 3.10 Investment castings should be heat treated, and the castings that have been corrected for deformation should be subjected to stress relief treatment after correction. 3.11 The surface roughness Ra value of investment castings should not be greater than 12.5Ⅱ. 3
SY5310-87
Surface decarburization is allowed for investment castings, but the decarburization depth shall not exceed the specified value in Table 7. 3.122
Table? Allowable value of decarburization layer depth
Casting wall
Deepness of decarburization layer on one side
For machining allowance of investment castings, see Appendix A (reference). 3.1.35
3.1.4For the draft angle during investment casting, see Appendix B (reference). 3.1.5For the minimum wall thickness of investment castings, see Appendix C (reference). 4 Inspection regulations and test methods
4.1 Chemical analysis shall be conducted for each melting furnace number, and the results of chemical analysis shall comply with the provisions of Tables 1 and 2. The arbitration analysis of chemical analysis shall be conducted in accordance with GB223-81 "Chemical Analysis Methods for Iron, Steel and Alloys". 4.2The mechanical properties of investment castings shall be checked regularly according to the stable production situation. The tensile test shall be carried out in accordance with the provisions of GB228-76 "Metal Tensile Test Method", the punchout test shall be carried out in accordance with the provisions of GB229-84 "Metal Charpy (U-Notch) Impact Test Method", and the hardness test shall be carried out in accordance with the provisions of GB231-84 "Metal Brinell Hardness Test Method". 4.3 Castings that need to be inspected for decarburization layer shall be inspected in accordance with GB22478 "Microscopic Determination of Decarburization Layer Thickness of Steel". When the depth of decarburization layer exceeds the specified range, carburization treatment is allowed, and then sampling and re-inspection are allowed, but the number of samples shall not be less than 3. 4.4.100% of the castings shall be inspected for appearance quality. The appearance quality inspected by conventional measuring tools shall comply with the relevant provisions and requirements of clauses 3.6 to 3.11.
4.5 The castings shall be inspected and accepted by the technical department of the manufacturer, and the ordering unit has the right to conduct re-inspection. 5.1 For castings with a mass exceeding 5kg, the qualified mark of the manufacturer's inspection department and the smelting number or chain manufacturing sequence number shall be marked on the cleaned non-machined surface; castings with a mass less than 5kg may be labeled. 5.2 Each batch of castings shall be accompanied by a certificate of conformity with the provisions of the standard when leaving the factory. The casting certificate of conformity shall include the following: a. Manufacturer name or code; b. Drawing number or part number; c. Material brand; d. Smelting furnace number, chemical composition and mechanical properties; e. This standard number.
5.3 The packaging of castings should ensure that there is no mechanical damage and rust during transportation.
Maximum size of the gap between the two sides of the casting
>100~250
>250~500
Cutting
Increase the thickness of the casting
1. The slope of the machined surface:
SY 5310--87
Attachment A
Machining allowance of molten casting
(reference part)
Machining allowance of single side of casting
Grinding process
Appendix B
Casting mold control slope of molten casting
(reference part)
Polishing
Die draft slope of investment casting
Combination of increasing and decreasing casting wall thickness
Non-machined surface slope of wall thickness 5~10mm
Range 2. Non-machined surface slope of wall thickness less than 5mm Casting height, mm
>20～50
>50~100
Casting outer surface
0*20°
With pouring
Reducing casting wall thickness
Non-machined surface of wall 10 blood
Non-addition.7.Casting slope
Casting inner surface
0'30"
Sintering surface area, cmbzxz.net
Minimum wall thickness, mm
Additional instructions:
$Y 5310--87
Appendix ℃
Minimum allowable wall thickness of castings
(reference)
This standard is proposed by the Machinery Manufacturing Department of the Ministry of Petroleum Industry. Minimum allowable wall thickness of castings
This standard is technically managed by the Shishan Exploration and Development Equipment and Materials Professional Standards Committee. This standard was drafted by the Second Petroleum Machinery Factory of the Ministry of Petroleum Industry. The main drafter of this standard is Gao Guilan.
100~-225
225-400
This standard continues to be effective 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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