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GB/T 3086-2019: High carbon chromium stainless bearing steels Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure Status: Valid GB/T 3086: Historical versions
GB/T 3086-2019: High carbon chromium stainless bearing steels---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT3086-2019NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 77.140.20 H 40 Replacing GB/T 3086-2008 High carbon chromium stainless bearing steels Issued on. JUNE 04, 2019 Implemented on. MAY 01, 2020 Issued by. State Administration for Market Regulation; Standardization Administration of the PRC. Table of ContentsForeword... 3 1 Scope... 5 2 Normative references... 5 3 Classification... 7 4 Order content... 8 5 Dimensions, shape, weight... 8 6 Technical requirements... 10 7 Test methods... 14 8 Inspection rules... 16 9 Packaging, marking, and quality certification... 16 Appendix A (Informative) Comparison of this Standard’s designations with foreign standards’ designations... 17 Appendix B (Normative) Standard diagrams of micropore and twin-crystal carbide structure... 18ForewordThis Standard is drafted in accordance with the rules given in GB/T 1.1-2009. This Standard replaces GB/T 3086-2008 “High carbon chromium stainless bearing steels”. Compared with GB/T 3086-2008, the main technical changes of this Standard are as follows. - ADD the classification according to steel’s end use (see 3.2); - Specify the tolerances for steel wire’s diameter (see 5.1.2); - Tighten requirements for sulfur and nickel content of chemical composition (see Table 4; Table 3 of the 2008 edition); - Delete the smelting method of induction furnace (6.2 of the 2008 edition); - Delete the inspection requirements for upsetting and fracture (6.5 and 6.6.2 of the 2008 edition); - Modify the macrostructure evaluation standards and requirements (see 6.5.1; 6.6.1 of the 2008 edition); - Delete the provision that if the supplier can ensure the tower inspection is qualified, the tower inspection may be omitted (see 6.6.3 of the 2008 edition); - Modify the rating diagrams and methods for non-metallic inclusions and the qualification level of DS-type inclusions (see Table 8; Table 6 and Appendix B of the 2008 edition); - Modify the evaluation method of eutectic carbide and add the evaluation and requirements for eutectic carbide size (see 6.7; 6.8 of the 2008 edition); - Modify the requirements for depth of decarburization of steels (see 6.10; 6.11 of the 2008 edition); - ADD requirement for non-destructive testing (see 6.11); - Modify the lot grouping rules (see 8.2; 8.2 of the 2008 edition); - Modify the re-inspection and decision rules (see 8.4; 8.4 of the 2008 edition); - ADD a table for comparison of this Standard’s designations with foreign standards’ similar designations (see Appendix A); - Delete standard rating diagrams of macrostructure and non-metallic inclusions (see A.1~A.6 of the 2008 edition). This Standard was proposed by China Iron and Steel Association. This Standard shall be under the jurisdiction of National Technical Committee 183 on Steel of Standardization Administration of China (SAC/TC 183). Drafting organizations of this Standard. Dongbei Special Steel Group Co., Ltd., China Metallurgical Information and Standardization Institute, Pangang Group Jiangyou Changcheng Special Steel Co., Ltd., Jiangsu Shenyuan Group Co., Ltd., Heye Special Steel Co., Ltd. Main drafters of this Standard. Kang Ge, Gong Chunlin, Luan Yan, Li Peng, Hu Jin, Tu Yuguo, Zhang Beibei, Zhang Guofu, Wang Xinhe. The previous editions of the standard replaced by this Standard were released as follows. - GB/T 3086-1982, GB/T 3086-2008. High carbon chromium stainless bearing steels1 ScopeThis Standard specifies the order content, dimensions, shape, weight, technical requirements, test methods, inspection rules, packaging, marking, and quality certification of high carbon chromium stainless bearing steels. This Standard applies to hot-rolled (forged), cold-drawn, peeled, and polished round steels with a nominal diameter of 5 mm~160 mm, round wire rods with a nominal diameter of 5 mm~40 mm, and round steel wires with a nominal diameter of 1 mm~16 mm (hereinafter referred to as “steels”).2 Normative referencesThe following documents are indispensable for the application of this document. For the dated references, only the editions with the dates indicated are applicable to this document. For the undated references, the latest edition (including all the amendments) are applicable to this document. GB/T 222 Permissible Tolerances for Chemical Composition of Steel Products GB/T 223.5 Steel and iron - Determination of acid-soluble silicon and total silicon content - Reduced molybdosilicate spectrophotometric method GB/T 223.11 Iron, steel and alloy - Determination of chromium content - Visual titration or potentiometric titration method GB/T 223.18 Methods for Chemical Analysis of Iron, Steel and Alloy - The Sodium Thiosulfate Separation Iodimetric Method for the Determination of Copper Content GB/T 223.23 Iron, Steel and Alloy - Determination of Nickel Content - The Dimethylglyoxime Spectrophotometric Method GB/T 223.26 Iron, steel and alloy - Determination of molybdenum content - The thiocyanate spectrophotometric method3 Classification3.1 Steel, according to the processing method used, is divided into the following two categories. The processing method used for steel shall be indicated in the contract. If not indicated, it shall be supplied according to the steel for cut work. 3.2 Steel, according to the end use, is divided into the following two categories. The end use of steel shall be indicated in the contract. If not indicated, it shall be supplied according to the steel for ferrule.4 Order contentThe contract or order for ordering in accordance with this Standard shall include the following.5 Dimensions, shape, weight5.1 Dimensions, shape, and tolerances 5.1.1 The dimensions, shape, and tolerances of round steels and wire rods shall comply with the requirements of Table 1.Through consultation between the supplier and the purchaser, and indicated in the contract, the dimensions, shape, and tolerances of steel may be performed according to other dimensional accuracy. 5.1.2 The dimensions and tolerances of steel wires shall comply with the Grade h11 specified in Table 2. 5.2 Weight 5.2.1 Steel rods and wire rods are delivered according to actual weight.6 Technical requirements6.1 Designation and chemical composition 6.1.1 The designation and chemical composition (heat analysis) of steel shall comply with the requirements of Table 4. 6.2 Smelting method Steel shall be smelted by electroslag remelting. According to the requirements of the purchaser and indicated in the contract, other methods may also be used for smelting. 6.4 Mechanical properties 6.4.1 The Brinell hardness of the annealed steel with a nominal diameter greater than 16 mm shall be 197 HBW~255 HBW. 6.5 Macrostructure 6.5.1 Etching macrostructure of steel is evaluated according to GJB 9443.The qualification level shall meet the requirements of Table 6. 6.5.2 Round steels shall be inspected for tower hairline. The sample for round steels with a nominal diameter of 16 mm~150 mm shall be made according to GB/T 15711. 6.6 Microstructure The microstructure of annealed steel shall be a uniformly-distributed fine- grained pearlite, allowing the presence of dispersed primary carbides, but no twin-crystal carbides shall be present (see Figure B.1 for a typical diagram). 6.7 Heterogeneity of eutectic carbide 6.8 Non-metallic inclusions Steels shall be inspected for non-metallic inclusions in accordance with GB/T 10561-2005.The inspection results shall comply with the requirements of Table 8. 6.11 Non-destructive testing 6.11.1 Round steels shall be subjected to ultrasonic testing. For those with a nominal diameter of not more than 60 mm, it shall meet Grade AA of GB/T 4162- 2008.For those with a nominal diameter of 60 mm~120 mm, it shall meet Grade A of GB/T 4162-2008.For those with a nominal diameter of more than 120 mm, the qualification level is negotiated by both the supplier and the purchaser. 6.12 Surface quality 6.12.4 The surface of steel wires shall be free from defects such as cracks, folds, and scarring which are harmful to the use. Allowable individual mechanical scratches and pit depths shall comply with Table 11. 6.12.5 The surface of peeled round steels, polished round steels and steel wires shall comply with the provisions of GB/T 3207.7 Test methods7.1 The chemical composition analysis of steel is usually carried out according to the general methods such as GB/T 4336, GB/T 11170, GB/T 20123, GB/T 20125.However, the arbitration is based on the provisions of GB/T 223.5, GB/T 223.11, GB/T 223.18, GB/T 223.23, GB/T 223.26, GB/T 223.62, GB/T 223.63, GB/T 223.68, GB/T 223.69. 7.2 Other inspection items and test methods for steel shall comply with the requirements of Table 12.8 Inspection rules8.1 Inspection and acceptance The inspection and acceptance of steels shall be carried out by the supplier’s technical quality supervision department. The purchaser has the right to accept in accordance with the provisions of this Standard. 8.3 Sampling locations and sampling quantities The sampling locations and sampling quantities of each lot of steels shall comply with the requirements of Table 12. 8.4 Re-inspection and decision rules 8.4.1 If any item of the inspection items is unqualified (except for white spots and non-metallic inclusions), the same quantity of samples may be taken again to re-inspect the unqualified items. If the re-inspection result is still unqualified, this lot of steels is judged as unqualified.9 Packaging, marking, and quality certification9.1 The packaging, marking, and quality certification of round steels and wire rods shall comply with the provisions of GB/T 2101. ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. 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