This standard specifies the technical requirements, acceptance rules, test methods, certificates and marks for shaft forgings of AC and DC motors. JB/T 1271-2002 Technical requirements for shaft forgings of AC and DC motors JB/T1271-2002 Standard download decompression password: www.bzxz.net

1CS77.140.85
Machinery Industry Standard of the People's Republic of China
B/T12712002
Replaces JB/T1271—1993
Specification for shaft forglngs for AC and DC clcctric machinery2002-12-27 issued
2003-04-01 implementation
The State Economic and Trade Commission of the People's Republic of China issued Preliminary
1 Scope
2 Normative reference documents
3 Ordering requirements,
4 Technical requirements.
Manufacturing process
4.2 Chemical composition
4.3 Mechanical properties
Ultrasonic velocity
Magnetic particle inspection or cold pickling inspection
4.6 Surface quality
5 Inspection rules and test monitoring methods
Chemical composition analysis.
5.2 Mechanical properties Mechanical performance test.
5.3 Acoustic wave flaw detection
5.4 Magnetic powder or cold pickling test
5.5 Equipment classification and inspection
5.6 Retest
5.7 Reheat treatment
G Acceptance and certificate of conformity,
Marking and packaging,
Table [Mechanical properties...
0 2 Mass fraction of chemical components
Table 3 Reduced product analysis 1, lower limit allowable deviation Table 4 Remote classification and inspectionbZxz.net
J/T1271—2002
This standard replaces B/T12711993 Technical conditions for AC and DC motor shaft whip parts 3. Compared with B/T1271-1903, this standard has the following changes: JB/T1271-2002
According to GB/T1.1-2000) & Standardization Work Guidelines Part 1: Standard Structure and Editing Rules and related standards, the original standard has been edited and revised:
Open-hearth cold refining method is removed;
Table 2 and Table 1 respectively add 1BMnMaNb steel grade composition and mechanical properties: In Table 2, the chemical composition of P and S are reduced from 0.030% to 0.025% respectively: In Table 3, the allowable deviation of the analysis of the finished product of large-section forgings is added: In the mechanical properties, 5, 6, 7 and 8 are appropriately improved. The magnetic particle inspection method is added for the bearing parts of grade forgings. This standard is proposed by China Machinery Industry Federation. The standard is under the jurisdiction of Deyang Large Components Research Institute. This standard was drafted by China Second Heavy Machinery Group Corporation and Dongfang Electric Corporation. The main drafters of this standard are Liu Gaoshu and Long Ben. This standard was first issued in 1972, revised for the first time in 1985, and revised for the second time in 1993. 1 Specification
Technical conditions for AC and DC motor shaft forgings
JB/T1271-2002
This standard specifies the technical requirements, acceptance rules, test methods, certificates and marks for AC and DC motor shaft forgings. This standard applies to the ordering, manufacturing and inspection of AC and DC motor shaft forgings. This standard does not apply to spindle yoke plating. 2 Normative references
The following documents become references to this standard through reference. For any dated referenced document, its subsequent revision (excluding errata) or revised version is not applicable to this standard. However, the parties who reach an agreement based on this standard are encouraged to study whether these normative original versions can be used. For any undated referenced document, its latest version applies to this standard. GB/T222 Sampling method for chemical analysis of steel and allowable difference of chemical composition of finished products GB/T223.3~78 Chemical analysis method of iron and alloy GH/T226 Macrostructure and defect corrosion test method of steel (AB/T226·1991, ISO4969:1980) GB/T228 Metal tensile test method GB229 Metal impact test method (GBT229-1994, ISO14B:1983) JB/T8467 Ultrasonic flaw detection method for plated parts B/T8468 Forged steel parts Powder inspection method
3 Order requirements
3.1 The purchaser shall specify the forging grade, steel grade, technical requirements, inspection frequency and other additional instructions in the order contract or technical agreement. 3.2 The purchaser shall provide the forging order drawing indicating the transmission and mechanical properties test specimen position (provide the sealed processing size if necessary), and mark the drawing as follows:
Forging grade×Number of this standard
4 Technical requirements
4.1 Manufacturing process
4.1.1 Sliding
Forging steel shall be smelted in a magnetic arc furnace. Other smelting methods may be used with the consent of the purchaser. 4.1.2 Head and tail cutting
The upper and lower left margins of the steel ingot for forgings shall be sufficient to ensure that the forgings have no shrinkage cavities and unacceptable segregation. 4.1.3 Forging
4.1.3.1 The forging machine and forging materials shall be selected according to the size of the forgings, so that the entire cross section of the forgings can be fully forged. The center line of the forging and the ingot shall roughly coincide.
4.1.32 During the forging process, the forging machine shall be driven by the end of the forging with better steel quality, and the forging machine shall be extended according to the requirements of the customer's drawings.
4.1.4 Heat treatment
4.1.4.1 The heat treatment of the forgings shall be carried out according to the requirements of JB/T1271-2002
203inSi
35CtMo||, unless the customer specifies the type of heat treatment. Generally, it can be carried out according to the provisions of Table 1. tt||18MnMoN
Heat treatment type
Normalizing, tempering
Normalizing, tempering
Normalizing, tempering
Direct preparation for certification
Position: mm1
≥300~500
>500--750
>750--1000
300~·500
×500-750
>750--1000
-5 30K)
>300---500
> 500 -. 750
>750--1000
>300~·500
>500~·750
(c250)
300-500
>500~ 750
Table 1 Mechanical properties
According to the agreement between the two parties
(=-18)
:2:45;
: =48)
3-30 yuan
4.1.4.2 When the mechanical properties of the whole piece in the normalized and tempered state do not meet the certain requirements, the supplier is allowed to adjust the forgings. 4.1.5 Mechanical processing
The forgings to be delivered shall meet the size and surface roughness requirements specified in the order drawing. 4.2 Chemical analysis
4.2.1 The melting analysis of the steel for the forging shall meet the requirements of Table 2. When the forgings are analyzed as finished products, the mass fraction of their chemical composition shall meet the requirements of Table 2, but the deviation from Table 3 is allowed. 4.22
Mass fraction of chemical composition in Table 2
20250si
20MnMo
35C:Mo
BMnMoNb
0.32--0.40
0.42--0.50
11.160.22
0.17--.0.23
0.12--0.20|| tt||U.16i~0.22
0.50--0.80
0.50-1.30
0.40~0.70
1.20~-1.60
1.2G 1.50
0.17~0.3?
0.17~1.37
0.17~-0.37
0.20--0.60
0.20 -0.40
n.t5~0.2.
0.15~-U.25
0.45--0.60
D.A02D--D.045
Specified
Maximum range
4.3 Mechanical properties
Table 3 Crystallization analysis Allowable deviation beyond the upper and lower limits of the specified maximum diameter of rough-machined silver parts
>290~410
4.3.1 The tangential properties of forgings shall comply with the provisions of Table 1. 410--570
>570--810
JB/T1271-2002
>810--1140
4.3.2 When the diameter of the test part is less than 250mm, a longitudinal performance specimen shall be taken, and the test results must reach the specified values ​​in brackets in Table 1. 4.4 Ultrasonic flaw detection
4.4.1 After the final treatment, the ultrasonic flaw detection shall be carried out. 4.4.2 For the forgings subjected to ultrasonic flaw detection, the surface roughness R shall be 6.3m1. 4.4.3 The forging surface shall not be contaminated with foreign matter that may affect the test results, such as paint, scale, dirt, etc. 4.4.4 The ultrasonic flaw detection results shall meet the following requirements: No defects such as cuts, cracks, and end holes are allowed. a) Defects with a diameter less than 20,000 mm are not counted. Single, dispersed non-metallic impurities with an equivalent diameter of 2mm~6mm are allowed to exist, but their spacing should not be less than 5 times the diameter of the larger defect. d) In the center of the forging, dense non-metallic impurities with an equivalent diameter of 2mm are allowed to exist, but the dense defect area shall not exceed 1/3 of the measured diameter. In the center of the forging, dense non-metallic impurities with an equivalent diameter of 2mm~3mm are allowed to exist, but the dense defect area shall not exceed 1/3 of the measured diameter.
Except the central parts specified in the above) and e), other parts are not allowed to have dense defects and continuous defects: f)
) For the transmission end journal with a diameter less than or equal to 50 mm, the equivalent point diameter of 5mm--6mm is not allowed to exceed 15.
4.5 Magnetic particle inspection or cold pickling inspection
5.5 For the specified II-level work, the bearing parts shall be magnetically inspected and cold pickled by the purchaser: the inspection results shall not have cracks, cracks, etc., and 15 defects with a length of 1mm~3mm are allowed to exist in each bearing part, but no more than one defect is allowed in an area of ​​25cm
4.6 Surface quality
The surface of the fake part shall not have cracks, cracks and other defects that affect the use. Local defects can be removed, and the removal depth should be 75% of the finishing allowance of the part.
JB/T1271—2002
5 Inspection rules and test methods
5.1 Chemical composition analysis
5.1.1 Chemical composition sampling shall be carried out in accordance with the provisions of GB/T222. 5.1.2 Chemical composition analysis shall be carried out in accordance with the provisions of GB/1223.3~78. 5.1.9 Finished product analysis samples shall be collected from the white forging or the extended part of the full-size general part at a diameter away from the surface, or from the mechanical properties sample. 5.2 Mechanical properties inspection
5.2.1 Sampling position and quantity
5.2.1.1 Sampling shall be carried out at both ends of the forging. Flange sampling shall be carried out on the flange section or on the specially forged 0. The buyer shall test at the better end of the forging, and the supplier shall test at the other end of the forging. Two eccentricity specimens and impact specimens shall be collected at each end. 5.2.1.2 For forgings with center holes, the sample shall be collected at 1/2 of the thickness. For forgings without center holes, the sample shall be collected at 1 flat diameter from the surface. 5.2.2 Tensile test
Perform in accordance with the provisions of GB/T228.
5.2.3 Impact test
Perform in accordance with the provisions of GB/T229.
5.3 Ultrasonic flaw detection
Perform in accordance with the provisions of JR/T8467
5.4 Powder-free or cold pickling inspection
5.4.1 The surface roughness of the magnetic particle inspection is R.3.2um. 6.4.2 The powder-free inspection is carried out in accordance with the provisions of GB/T8468. 5.4.3 The surface roughness R of the cold pickling inspection is 0.Bum. 5.4.4 Cold touch test shall be carried out in accordance with the provisions of GR/T226. First, filter with 15% (mass fraction) persulfate, then dissolve with 10% (mass fraction) acid water. After pickling, conduct the second inspection. The first inspection shall be carried out 1(m after pickling, and the second inspection shall be carried out not less than 12h after pickling.
5.5 Grading and inspection of forgings
Grading and inspection of forgings shall be carried out in accordance with the provisions of Table 4. Table 4 Grading and inspection of forgings
General preparation
6.6 Retest
Inspection items
Chemical analysis, bending strength, section yield rate
Chemical analysis, bending strength, tensile strength, section length rate, section shrinkage, external absorption test, ultrasonic flaw detection
Chemical analysis, bending strength, tensile strength, section length rate, frequency shrinkage rate. Ultrasonic flaw detection
Chemical analysis, bending strength, tensile strength, section length rate, frequency shrinkage rate. Ultrasonic flaw detection , magnetic powder or holding washing inspection
5.6.1 When the mechanical properties test results do not meet the current requirements, the test requirements are allowed to be carried out
3%-5% of the batch film parts of the same smelting number and the same drawing number are sampled
All the parts are tested
The parts are tested
5.6.2 If one sample fails the mechanical properties test, two samples should be cut from the test ring adjacent to the test sample for retest. If there are white spots or cracks on the sample, retest is not allowed. The retest results of the two samples must not meet the specified requirements. 5.7 To the new heat treatment
If any mechanical property test result of the fake part is still unqualified , the forgings shall be re-heat treated during the supply period, but the re-heat treatment shall not exceed three times (excluding heat treatment). Forgings that have been re-heat treated shall be inspected and accepted according to the provisions of this standard and the requirements of the order technical agreement. 5.2.1 Sampling: Re-delivery acceptance 6 Acceptance and certificate of conformity
6.1 The technical inspection department of the Russian party shall inspect and accept the forgings in accordance with the provisions of this standard and the requirements of the order technical agreement. 4
JB/T1271---2002
8.2 The purchaser may re-inspect in accordance with the provisions of this standard and the order technical agreement. After the inspection, if any non-compliance with the provisions of this standard and the order technical agreement is found, the two parties may negotiate to deal with it. 6.3 Forgings that should be delivered, The purchaser shall be provided with a product certificate and a factory certificate that include all the inspection data that can be inspected in the standard and order technical agreement. The person in charge of the quality inspection department shall sign or stamp on them. 6.4 For the rough-processed and delivered parts, after the inspection and testing, a product certificate shall be written (one certificate for each part of the rough-processed and I-level parts). The product certificate shall be signed or stamped by the person in charge of the quality inspection department. 6.5 The product certificate shall include the following contents: a) Contract number
6) Order drawing number:
) Standard number and forging grade:
d) Forging number, smelting furnace number and forging number (forging card number) 1e Technical requirements test results.
Marking and packaging
1 On the end face of the better end of the forging, the supplier's factory name or logo, contract number, forging number (card number), steel grade and other steel marks shall be marked, and the forging shall be painted with white paint.
.2 During the weighing process, the forgings should be prevented from being damaged by friction.5. For Grade II work specified in the regulations, the bearing parts shall be inspected and tested by the purchaser: the inspection results shall be free of defects such as cracks, cracks, etc., and 15 defects with a length of 1mm~3mm are allowed to exist in each bearing part, but no more than one defect is allowed in an area of ​​25cm. 4.6 Surface quality: There shall be no cracks on the surface of the fake part, and defects that affect the use. Local defects are allowed to be removed, and the removal depth should be 75% of the finishing allowance of the part.
JB/T1271—2002
5 Inspection rules and test methods
5.1 Chemical composition analysis
5.1.1 Chemical composition sampling shall be carried out in accordance with the provisions of GB/T222. 5.1.2 Chemical composition analysis shall be carried out in accordance with the provisions of GB/1223.3~78. 5.1.9 Finished product analysis samples shall be collected from the white forging or the extended part of the full-size general part at a diameter away from the surface, or from the mechanical properties sample. 5.2 Mechanical properties inspection
5.2.1 Sampling position and quantity
5.2.1.1 Sampling shall be carried out at both ends of the forging. Flange sampling shall be carried out on the flange section or on the specially forged 0. The buyer shall test at the better end of the forging, and the supplier shall test at the weaker end of the forging. Two eccentricity specimens and impact specimens shall be collected at each end. 5.2.1.2 For forgings with center holes, samples shall be collected at 1/2 of the thickness. For forgings without center holes, samples shall be collected at 1 flat diameter from the surface. 5.2.2 Tensile test
Perform in accordance with GB/T228.
5.2.3 Impact test
Perform in accordance with GB/T229.
5.3 Ultrasonic flaw detection
Perform in accordance with JR/T8467.
5.4 Powder-free or cold pickling inspection
5.4.1 The surface roughness of magnetic particle inspection is R.3.2um. 6.4.2 Powder-free inspection is carried out in accordance with GB/T8468. 5.4.3 The surface roughness R of cold pickling inspection is 0.Bum. 5.4.4 Cold touch test shall be carried out in accordance with the provisions of GR/T226. First, filter with 15% (mass fraction) persulfate, then dissolve with 10% (mass fraction) acid water. After pickling, conduct the second inspection. The first inspection shall be carried out 1(m after pickling, and the second inspection shall be carried out not less than 12h after pickling.
5.5 Grading and inspection of forgings
Grading and inspection of forgings shall be carried out in accordance with the provisions of Table 4. Table 4 Grading and inspection of forgings
General preparation
6.6 Retest
Inspection items
Chemical analysis, bending strength, section yield rate
Chemical analysis, bending strength, tensile strength, section length rate, section shrinkage, external absorption test, ultrasonic flaw detection
Chemical analysis, bending strength, tensile strength, section length rate, frequency shrinkage rate. Ultrasonic flaw detection
Chemical analysis, bending strength, tensile strength, section length rate, frequency shrinkage rate. Ultrasonic flaw detection , magnetic powder or holding washing inspection
5.6.1 When the mechanical properties test results do not meet the current requirements, the test requirements are allowed to be carried out
3%-5% of the batch film parts of the same smelting number and the same drawing number are sampled
All the parts are tested
The parts are tested
5.6.2 If one sample fails the mechanical properties test, two samples should be cut from the test ring adjacent to the test sample for retest. If there are white spots or cracks on the sample, retest is not allowed. The retest results of the two samples must not meet the specified requirements. 5.7 To the new heat treatment
If any mechanical property test result of the fake part is still unqualified , the forgings shall be re-heat treated during the supply period, but the re-heat treatment shall not exceed three times (excluding heat treatment). Forgings that have been re-heat treated shall be inspected and accepted according to the provisions of this standard and the requirements of the order technical agreement. 5.2.1 Sampling: Re-delivery acceptance 6 Acceptance and certificate of conformity
6.1 The technical inspection department of the Russian party shall inspect and accept the forgings in accordance with the provisions of this standard and the requirements of the order technical agreement. 4
JB/T1271---2002
8.2 The purchaser may re-inspect in accordance with the provisions of this standard and the order technical agreement. After the inspection, if any non-compliance with the provisions of this standard and the order technical agreement is found, the two parties may negotiate to deal with it. 6.3 Forgings that should be delivered, The purchaser shall be provided with a product certificate and a factory certificate that include all the inspection data that can be inspected in the standard and order technical agreement. The person in charge of the quality inspection department shall sign or stamp on them. 6.4 For the rough-processed and delivered parts, after the inspection and testing, a product certificate shall be written (one certificate for each part of the rough-processed and I-level parts). The product certificate shall be signed or stamped by the person in charge of the quality inspection department. 6.5 The product certificate shall include the following contents: a) Contract number
6) Order drawing number:
) Standard number and forging grade:
d) Forging number, smelting furnace number and forging number (forging card number) 1e Technical requirements test results.
Marking and packaging
1 On the end face of the better end of the forging, the supplier's factory name or logo, contract number, forging number (card number), steel grade and other steel marks shall be marked, and the forging shall be painted with white paint.
.2 During the weighing process, the forgings should be prevented from being damaged by friction.5. For Grade II work specified in the regulations, the bearing parts shall be inspected and tested by the purchaser: the inspection results shall be free of defects such as cracks, cracks, etc., and 15 defects with a length of 1mm~3mm are allowed to exist in each bearing part, but no more than one defect is allowed in an area of ​​25cm. 4.6 Surface quality: There shall be no cracks on the surface of the fake part, and defects that affect the use. Local defects are allowed to be removed, and the removal depth should be 75% of the finishing allowance of the part.
JB/T1271—2002
5 Inspection rules and test methods
5.1 Chemical composition analysis
5.1.1 Chemical composition sampling shall be carried out in accordance with the provisions of GB/T222. 5.1.2 Chemical composition analysis shall be carried out in accordance with the provisions of GB/1223.3~78. 5.1.9 Finished product analysis samples shall be collected from the white forging or the extended part of the full-size general part at a diameter away from the surface, or from the mechanical properties sample. 5.2 Mechanical properties inspection
5.2.1 Sampling position and quantity
5.2.1.1 Sampling shall be carried out at both ends of the forging. Flange sampling shall be carried out on the flange section or on the specially forged 0. The buyer shall test at the better end of the forging, and the supplier shall test at the weaker end of the forging. Two eccentricity specimens and impact specimens shall be collected at each end. 5.2.1.2 For forgings with center holes, samples shall be collected at 1/2 of the thickness. For forgings without center holes, samples shall be collected at 1 flat diameter from the surface. 5.2.2 Tensile test
Perform in accordance with GB/T228.
5.2.3 Impact test
Perform in accordance with GB/T229.
5.3 Ultrasonic flaw detection
Perform in accordance with JR/T8467.
5.4 Powder-free or cold pickling inspection
5.4.1 The surface roughness of magnetic particle inspection is R.3.2um. 6.4.2 Powder-free inspection is carried out in accordance with GB/T8468. 5.4.3 The surface roughness R of cold pickling inspection is 0.Bum. 5.4.4 Cold touch test shall be carried out in accordance with the provisions of GR/T226. First, filter with 15% (mass fraction) persulfate, then dissolve with 10% (mass fraction) acid water. After pickling, conduct the second inspection. The first inspection shall be carried out 1(m after pickling, and the second inspection shall be carried out not less than 12h after pickling.
5.5 Grading and inspection of forgings
Grading and inspection of forgings shall be carried out in accordance with the provisions of Table 4. Table 4 Grading and inspection of forgings
General preparation
6.6 Retest
Inspection items
Chemical analysis, bending strength, section yield rate
Chemical analysis, bending strength, tensile strength, section length, section shrinkage, external absorption test, ultrasonic flaw detection
Chemical analysis, bending strength, tensile strength, section length, frequency shrinkage. Ultrasonic flaw detection
Chemical analysis, bending strength, tensile strength, section length, frequency shrinkage. Ultrasonic flaw detection. , magnetic powder or holding washing inspection
5.6.1 When the mechanical properties test results do not meet the current requirements, the following test requirements are allowed:
3%-5% of the batch film parts of the same smelting number and the same drawing number are sampled for testing
The parts are tested
5.6.2 If one sample fails the mechanical properties test, two samples shall be cut from the test ring adjacent to the test sample for retest. If there are white spots or cracks on the sample, retest is not allowed. The retest results of the two samples must not meet the specified requirements. 5.7 To new heat treatment
If any mechanical property test result of the fake part is still unqualified , the forgings shall be re-heat treated during the supply period, but the re-heat treatment shall not exceed three times (excluding heat treatment). Forgings that have been re-heat treated shall be inspected and accepted according to the provisions of this standard and the requirements of the order technical agreement. 5.2.1 Sampling: Re-delivery acceptance 6 Acceptance and certificate of conformity
6.1 The technical inspection department of the Russian party shall inspect and accept the forgings in accordance with the provisions of this standard and the requirements of the order technical agreement. 4
JB/T1271---2002
8.2 The purchaser may re-inspect in accordance with the provisions of this standard and the order technical agreement. After the inspection, if any non-compliance with the provisions of this standard and the order technical agreement is found, the two parties may negotiate to deal with it. 6.3 Forgings that should be delivered, The purchaser shall be provided with a product certificate and a factory certificate that include all the inspection data that can be inspected in the standard and order technical agreement. The person in charge of the quality inspection department shall sign or stamp on them. 6.4 For the rough-processed and delivered parts, after the inspection and testing, a product certificate shall be written (one certificate for each part of the rough-processed and I-level parts). The product certificate shall be signed or stamped by the person in charge of the quality inspection department. 6.5 The product certificate shall include the following contents: a) Contract number
6) Order drawing number:
) Standard number and forging grade:
d) Forging number, smelting furnace number and forging number (forging card number) 1e Technical requirements test results.
Marking and packaging
1 On the end face of the better end of the forging, the supplier's factory name or logo, contract number, forging number (card number), steel grade and other steel marks shall be marked, and the forging shall be painted with white paint.
.2 During the weighing process, the forgings should be prevented from being damaged by friction.2 The purchaser may conduct re-inspection according to the provisions of this standard and the order technical agreement. After the inspection, if any non-compliance with the provisions of this standard and the order technical agreement is found, the supplier and the supplier may negotiate and deal with it. 6.3 For the forgings to be delivered, the purchaser shall be provided with a product certificate and a factory certificate containing all the inspection data that can be tested in the standard and the order technical agreement, which shall be signed or stamped by the person in charge of the quality inspection department. 6.4 For the forgings delivered after rough processing, after the inspection and testing are qualified, a product certificate shall be written (one certificate for each for the first and second grade parts). The product certificate shall be signed or stamped by the person in charge of the quality inspection department. 6.5 The product certificate shall include the following contents: a) Contract number
6) Order drawing number:
7) Standard number and forging grade:
8) Forging number, smelting furnace number and forging number (forging card number) 9) Inspection results of technical requirements.
Marking and packaging
.1 The supplier's factory name or logo, contract number, rough number (card number), steel grade, etc. should be marked on the end face of the good end of the forging, and the forging should be marked with white paint.
.2 During the weighing process, the forging should be prevented from being damaged by collision and friction.2 The purchaser may conduct re-inspection according to the provisions of this standard and the order technical agreement. After the inspection, if any non-compliance with the provisions of this standard and the order technical agreement is found, the supplier and the supplier may negotiate and deal with it. 6.3 For the forgings to be delivered, the purchaser shall be provided with a product certificate and a factory certificate containing all the inspection data that can be tested in the standard and the order technical agreement, which shall be signed or stamped by the person in charge of the quality inspection department. 6.4 For the forgings delivered after rough processing, after the inspection and testing are qualified, a product certificate shall be written (one certificate for each for the first and second grade parts). The product certificate shall be signed or stamped by the person in charge of the quality inspection department. 6.5 The product certificate shall include the following contents: a) Contract number
6) Order drawing number:
7) Standard number and forging grade:
8) Forging number, smelting furnace number and forging number (forging card number) 9) Inspection results of technical requirements.
Marking and packaging
.1 The supplier's factory name or logo, contract number, rough number (card number), steel grade, etc. should be marked on the end face of the good end of the forging, and the forging should be marked with white paint.
.2 During the weighing process, the forging should be prevented from being damaged by collision and friction.
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