JB/T 9180.2-1999 General technical requirements for steel refrigeration extrusions
Some standard content:
JB/T9180.2-1999
This standard adopts the relevant chapters of the German Technical Standards compiled by the German Engineers Association and the relevant contents of the Japanese Industrial Standard JIS G3539-1980 "Description of Carbon Steel for Cold Forging" and ISO 4954 "Steel for Cold Forging and Cold Extrusion". This standard is a revision of ZB132009-89 "General Technical Conditions for Cold Extruded Steel Parts". During the revision, only editorial changes were made according to relevant regulations, and the technical content was not changed. This standard replaces ZBJ32009-89 from the date of implementation. This standard is proposed and managed by the National Technical Committee for Forging Standardization. The drafting unit of this standard: Beijing Institute of Mechanical and Electrical Engineering. Drafters of this standard: Li Chuanjin, Wang Bingyi
1 Scope
Machinery Industry Standard of the People's Republic of China
General Specifications for Cold Extruded Steel Parts
General specifications for cold extruded steel partsJB/T 9180.2--- 1999
Replaces ZBJ3200989
This standard specifies the technical requirements for common materials, heat treatment, mechanical properties and surface quality of cold extruded steel parts, as well as the acceptance methods, inspection rules and markings, packaging and transportation. This standard is applicable to cold extruded steel parts mass-produced by cold extrusion. 2 Referenced standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards will be revised. Parties using this standard should explore the possibility of using the latest versions of the following standards. GB/T 224--1987
GB/T 226---1991
GB/T 228--1987
GB/T 231---1984
GB/T 233---1982
GB/T 699--- 1988
GB/T 700—1988
GB/T 1220--1992
GB/T 1591---1994
GB/T 2828---1987
GB/T 2829---1987
Method for determination of the depth of decarburized layer of steel
Method for acid etching test of macrostructure and defects of steelMetal tensile test method
Metal Brinell hardness test method
Metal upsetting test method
Technical conditions for high-quality carbon structural steel
Carbon structural steel
Stainless steel bars
Low-alloy high-strength structural steel
Batch inspection counting sampling procedure and sampling table (applicable to inspection of continuous batches) Periodic inspection counting sampling procedure and sampling table (applicable to inspection of production process stability) GB/T 6478-1986
Technical conditions for cold heading steel
JB/T9180.1-1999Tolerances for cold extruded steel partsWJ2681977Technical conditions for cold extruded 37.57mm steel grenade assemblies3 Technical elements
3.1 Raw materials
3.1.1 The raw materials used for cold extruded parts shall comply with the relevant material standards of GB/T700, GB/T699, GB/T1591, GB/T1220, GB/T6478WJ268, and meet the material supply status or other requirements. Common steel grades for cold extruded parts are shown in Table 1. Table 1
Carbon steel and
High quality carbon structural steelwwW.bzxz.Net
Q195.Q215,Q235,Q255,08.10,15.20.25.30.35.40.15.50.ML08.MI.10.MI.15,ML.20.ML30,ML35,ML10.ML15.S15A
Approved by the State Machinery Industry Bureau on 1999-06-24 238
Implemented on 2000-01-01
Alloy structural steel
Stainless acid-resistant steel
JB/T9180. 2-1999
Table 1 (end)
15Cr.20Cr.10Cr.20Mn2.20CrMo,30CrMo,35CrMo,42CrMo.40MnB.20CrMnTi.MI.15Cr.ML20Cr.ML40Cr.M1L5MnB,ML30CrMo,ML35CrMo,MI.12CrMooCr13,1Cr13.2Cr13,4Cr13.oCr18Ni9Ti1Cr18Ni9ri3.1.2 The raw materials of cold extrusion parts shall be accompanied by the factory qualification certificate. The cold extrusion parts manufacturer may conduct re-inspection according to the technical conditions, and the production can be put into production only after the re-inspection is qualified. The items and contents of the re-inspection include: a) Appearance inspection
The surface of the material should be smooth, and no cracks, scars, inclusions, folds, cracks, shrinkage holes, bubbles, mechanical damage, oil stains, rust and other defects are allowed. The roundness and dimensional tolerance of the material shape should meet the supply requirements. b) Chemical analysis and metallographic inspection
The chemical element content of the raw materials should meet the requirements of the relevant standards. According to the requirements, the depth of the decarburized layer can be measured and the level of carbide segregation can be determined. The specific requirements are determined by negotiation between the supply and demand parties. c) Mechanical property inspection
Mechanical property inspection shall be carried out according to the relevant material standards. The inspection items include yield point, tensile strength, elongation after fracture3, cross-sectional shrinkage, Brinell hardness HB and cold forging test. 3.1.3 When the surface state, size and tolerance of the material cannot meet the requirements, peeling, cold drawing, grinding or other corresponding methods shall be used to improve the surface quality of the material.
3.1.4 During the processing of cold extrusion parts, if the product material is found to have foreign metal inclusions, internal cracks, shrinkage holes, bubbles, interlayers, peeling and serious non-metallic inclusions, the defective products should be removed; if they cannot be removed, the products shall be scrapped according to the situation according to the plate (ingot) or furnace (tank). If white spots are found, the entire furnace shall be scrapped.
3.1.5 When the broken material is made by shearing or other mechanical processing methods, the end face of the broken material is not allowed to have tearing and serious burrs. 3.2 Heat treatment
3.2.1 Heat treatment of raw materials before cold extrusion
The raw materials need to be heat treated before cold extrusion to improve the plasticity of the material and reduce the deformation resistance of the material. The hardness after heat treatment is shown in Table 2.
3.2.2 Heat treatment of cold extrusion parts
Cold extrusion parts are generally not heat treated after forming. If the product needs to be heat treated, specific provisions must be made in the product drawings. Table 2
Carbon structural steel
08,ML08
35,ML35
3.3 Shapes and dimensions of cold extruded parts
Alloy structural steel
15Cr.ML15Cr
20Cr.ML20Cr
40Cr.M1.40Cr
15Mn,Ml.15MnB
20CrMnTi
35CrMo,ML.35CrMo
42CrMo,M142CrMo
Stainless acid-resistant steel
OCr18Ni9Ti
ICr18Ni9Ti
The shapes and dimensions of cold extruded parts shall comply with the requirements of the drawings and technical documents. The tolerance of cold extrusion parts shall comply with the requirements of J13/T9180.1 or the drawing requirements agreed upon by both parties. 239
3.4 Surface quality of cold extrusion parts
JB/T 9180.2 -1999
The surface quality of cold extrusion parts shall comply with the requirements of product drawings. Generally, cracks, folds, shrinkage holes, bruises and other defects are not allowed. The depth of defects on the processed surface should be less than 1/2 of the processing allowance. 3.5 Mechanical properties of cold extrusion parts
3.5.1 Fiber structure
The fiber structure of cold extrusion parts should have a fiber direction that conforms to the shape, and generally no inspection is required. If there are special requirements for the metal flow direction or fiber structure, they should be specified in the relevant technical conditions. 3.5.2 Mechanical properties
Cold extrusion parts are generally not subject to mechanical property inspections. If there are special requirements, they must be specified in the product drawings. 3.6 Test methods
The test methods shall be as specified in Table 3.
Test items
Test methods
3.7 Inspection rules
Tensile test
GB/T228
Hardness test
GB/T231
Macrostructure
GB/T 226
Cold forging
GB/1233
Decarburized layer
GB/T224
Cold extrusions shall be inspected and accepted by the production quality inspection department according to the cold extrusion drawings and technical documents. They shall be accompanied by a product quality certificate before leaving the factory.
3.7.1 General inspection
General inspection refers to the appearance inspection and precision inspection of cold extrusions according to the provisions of the cold extrusion drawings and technical documents. Appearance inspection can be carried out by touching, visual inspection, light reflection, internal and external surface roughness inspection instrument and other methods to inspect the appearance quality of cold extrusions.
Precision inspection is to use special inspection tools or universal measuring tools to inspect the size, shape and position tolerance of cold extrusion parts. 3.7.2 Supplementary inspection
Supplementary inspection refers to the inspection outside the general inspection, including the inspection of hardness, decarburization depth, macrostructure, fiber structure, cleanliness and rust prevention.
3.7.3 Acceptance method
Since cold extrusion parts are mass-produced, random inspection or full inspection can be carried out as needed. The random inspection method shall be carried out in accordance with the provisions of G1B/T2828 or GB/T2829.
When cold extrusion parts are supplied, deviations from the ordered quantity are allowed, and the deviation value shall be agreed upon by the supply and demand parties. 3.8 Marking, packaging and transportation
3.8.1 Cold extrusion parts are generally not marked. When marking is required, the supply and demand parties shall agree. 3.8.2 Cold extrusion parts shall be free of dirt and metal chips, and cold extrusion parts without metal coating shall be coated with rust inhibitor. Under normal transportation and storage conditions, it should be guaranteed that there will be no rust within three months from the date of leaving the factory. 3.8.3 Packaging requirements
Each batch of cold extrusion parts should be supplied with a certificate of conformity. Its main contents include: a) name of cold extrusion parts, cold extrusion part number; b) material brand, quantity, and date of leaving the factory; c) quality inspection and qualified mark;
d) manufacturer's name.
3.8.4 The anti-rust, packaging, transportation methods and requirements of cold extrusion parts should be indicated in the order agreement. 240
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