This standard specifies the classification, grade, size, shape, technical requirements, test methods, inspection rules, packaging, marking and quality certificate of stainless steel wire for cold heading. This standard is applicable to the manufacture of round cross-section stainless steel wire for bolts, screws and rivets. GB/T 4232-1993 Stainless steel wire for cold heading GB/T4232-1993 Standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Stainless steel wires for cold heading and cold forging1 Subject content and scope of application
GB/T 4232-93
Replaces GB 4232-H4
This standard specifies the classification, grade, size, shape, technical requirements, test methods, inspection rules, packaging, marking and quality certificate of stainless steel wires for cold forging.
This standard is applicable to the manufacture of high-strength stainless steel wires (hereinafter referred to as steel wire) for bolts, screws and rivets. 2 Reference standards
GB222 Chemical analysis of steel Monthly test sampling method and allowable deviation of chemical composition of finished products GB223 Chemical analysis methods for steel and alloys
GB228 Metal tensile test method
Metal upsetting test method
Dimensions, shape, weight and allowable deviation of cold drawn round steel wire GB 342
Stainless steel
GB1220
GB2103
3 Classification and brand
General provisions for acceptance, packaging, marking and quality certificate of steel wire Steel wire is divided into three categories according to its organization. Its category, brand, state and code are listed in Table 1. Table 1
Austenite
Plain
Martensite
MLoC16Vi18
MLICrI&NigTi
MI.oCI1RNi9
MLOCr1&NiSCu3
MI.ICr18Ni12
MIaCr18Ni12
MLiCr1?
MLICr13
ML1C117Ni2
State Administration of Technical Supervision1993-06-01Approved delivery status
Status will be sought
1994-01-01Implementation
4 Dimensions and appearance
GB/T 4232—93
Diameter range of steel wire: 1.0~6.0 mm in soft state, 1.0~14.0 mm in light drawing4.1
4.2 The allowable deviation of steel wire diameter shall comply with the requirements of Grade 11 or Grade 10 in Table 2 of GB 342. The requirement of Grade 10 shall be indicated in the contract, and the goods shall be supplied as Grade 11 in the specification.
4.3 The roundness of steel wire shall not be greater than half of the diameter. 4.4 Each coil of steel wire shall be neat and not scattered or deformed. 4.5 Marking and indication
The stainless steel wire for cold heading forging with a diameter of 3.αmm and a soft state and a tolerance of 10 made of MLocr18Nis is marked as: h10-3.0-GB 342
Stainless steel wire for cold heading forging MLOCF18Vi9-R-GB/T42325 Technical requirements
5.1 Chemical composition
5.1.1 The chemical composition of steel for steel wire shall conform to the specification deviation of the corresponding grade in GB 1220. The chemical composition of ML0Cr16Ni18 and MI.0Cr18Ni12 shall comply with the provisions of Table 2.
MLC16Ni28
M1.r18Ni2
Beijing Xue Zhanfen
.0.035
5.1.2 The allowable deviation of the chemical composition of sodium shall comply with the provisions of GB 222. 5.1.3 The carbon content of MI.1Cr13 shall not be less than 10.08%. 5.2 Delivery status
5.2.1 Steel wire shall be delivered in the delivery status specified in Table 1. S
15.c0--17.0c17.00-19.03
.03016.3-19.011.-13. s
Soft state (R): The steel wire is brightly heat treated or pickled after hot treatment. Light drawing (Q): The steel wire is heat treated and drawn with very little deformation. 5.2.2 According to the requirements of the strength, other conditions of wire can be provided. 5.3 Mechanical properties The mechanical properties of the steel wire shall comply with the provisions of Table 3. Table 3 Relative strength (R) M[.uCr18Nig Resistant strength 1. C--3. 0 595--740 3. C-~6. C 540-690 The rate of reduction shall not be less than 1. 0-- 3. (
>3. 0~24-
Light pull Q)
Tensile strength
640-750
560710
Elongation
Low rate!
ME.OCI18Ni12
ML.OCr1RNi9Cu3
MLC16Ni18
MLIC+1HNTi
ML.1CtlaNi1?
Number (R)
Release strength
1. 0~3. d 519--60
3. 0~6. :96~610
1. 0-3. 7 450~640
3. 0--6. 9 440-- 590
1. 0~3.9450~640
3. 0~6. d
10-590
1, t--3. d 620~-776:
580--730
> 3. 0--6. 0
1. 0~-3. 40--6Uu
>3.0 -6.0 51-660
1. ~3. 1+1~640
3.n6.g400600
ME.ll'r17Ni2
1. 0~3. 0 440~5*0
3. 0--6. 0 400- 60
1. 0~3. 0 590 -~790
590~-790
3. 0 ~6.
5.4 Cold forging properties
GB/T 4232—93
Continued Table 3
Elongation
Not less than
Sectional shrinkage
Rate not less than
2*3. 0~14. 0
[- t~-3. (
3. 0--11.
1. 011. 1
light pull (Q)
tensile strength
560~710
310~-690
510--850
170--650
510-~·690
1.t~-3. t :
3. 2 --11. 0
1. 0 ~3. f
2- 3. 01-- 74. C
1. 9 ~- 3.
3. 0~-14.
1. 0 --3. 0
3. 0 ~ 11. 0
.>3. t~-11. 01
61:--76:
591--749
560-~71
51--740
160--540
510-740
460--641)
640~841
610--840
Elongation
not less than
The steel wire should be subjected to cold forging test, and the cold pre-forging should be one-third of the original test specimen height. There should be no cracks and cracks on the surface of the specimen. According to the negotiation between the supply and demand parties, it can also be forged to one-third of the original test specimen -5.5 Surface qualitybZxz.net
Sectional shrinkage
rate is not small
The surface of the steel wire should be smooth and clean. There shall be no defects such as scars, folds, scales, cracks, pits and scratches that are harmful to the use. Under special provisions, the surface of the steel wire is allowed to have individual scars, embedded points and scratches with a depth not exceeding half of the tolerance. 5.6 Special requirements
5.6.1 According to the requirements of the purchaser, austenitic steel wire can be subjected to the intermediate corrosion test. The test method shall be agreed upon by the supplier and the purchaser and shall be indicated in the contract. 5.6.2 According to the requirements of the purchaser, the surface of the steel wire shall be coated with a lubricating agent suitable for cold forging. 6 Test methods
The test methods for steel wire shall be implemented in accordance with the provisions of Table 4. 7 Inspection rules
7.1 Inspection and acceptance
The inspection and acceptance of steel wire shall be in accordance with the provisions of GB2103. 7.2 Batch rules
GB/T 4232 93
Steel wire shall be inspected in batches, and each batch shall consist of steel wires of the same brand, same furnace number, same specification and same delivery status. Table 1
Test top II
Chemical composition
Size
Surface quality
Pad extension test
Cold top destruction test
Crystal corrosion
Note: Chemical composition The supplier only performs smelting analysis. 7.3 Sample display and position
Test method
GH 233
Measure with phase trace precision measuring instrument
Visual inspection
GH 228, sample gauge length 110 nm
Coordinated by both parties
The sampling quantity and position of steel wire shall comply with the provisions of Table 4 7.4 Re-inspection and judgment rules
The re-inspection and demarcation rules shall comply with the provisions of C+B2103. 8 Packaging, marking and quality certificate
Sampling quantity and position
GB 222, each
3 reels per batch, take pieces at both ends
3 reels per batch, take pieces at one end
2 reels per batch, end at most
The packaging, marking and quality certificate of steel wire shall comply with (GB 2103 Austenitic and ferritic steel wires are packaged according to Class II, and martensitic steel wires are packaged according to Class II.
Additional Notes:
This standard was proposed by the Ministry of Metallurgical Industry of the People's Republic of China. This standard is under the jurisdiction of the Information Standards Research Institute of the Ministry of Metallurgical Industry. This standard was issued by Dalian Steel Plant.
The main drafters of this standard are Wang Xinhong and Chu Xiaoqian. The level of this standard is marked as GR/T 4232--93T
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