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GB/T 3203-2016: Carburizing steels for bearing 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 3203: Historical versions
GB/T 3203-2016: Carburizing steels for bearing---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/GBT3203-2016GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 77.140.10 H 40 Replacing GB/T 3203-1982 Carburizing steels for bearing Issued on: DECEMBER 30, 2016 Implemented on: SEPTEMBER 1, 2017 Issued by. General Administration of Quality Supervision, Inspection and Quarantine; Standardization Administration Committee. Table of ContentsForeword ... 3 1 Scope ... 5 2 Normative references ... 5 3 Classifications and codes ... 7 4 Order content ... 8 5 Size, shape, weight ... 9 6 Technical requirements ... 11 7 Test methods ... 17 8 Inspection rules ... 18 9 Packaging, marks and quality certificate ... 19ForewordThis Standard was drafted in accordance with the rules given in GB/T 1.1-2009. This Standard replaces GB/T 3203-1982 Specification for carburizing steels of bearings. Compared with GB/T 3203-1982, the main technical modifications are as follows. - added bright round steel; deleted “steel billet” (see Clause 1 of this Edition); - added “normative references” (see Clause 2 of this Edition); - added “classifications and codes” (see Clause 3 of this Edition); - added “order content” (see Clause 4 of this Edition); - modified size, shape and tolerance (see Clause 5 of this Edition; Clause 1 of Edition 1982); - added designation G23Cr2Ni2Si1Mo and relative technical requirements (see 6.1.1, 6.5, 6.6, 6.8 of this Edition); - added requirements for nickel content in G20CrMo steel and molybdenum content in G20Cr2Ni4 steel (see Table 4 of this Edition; Table 2 of Edition 1982); - modified requirements for silicon, manganese, chromium contents in G20CrNiMo and G20CrNi2Mo steels (see Table 4 of this Edition; Table 2 of Edition 1982); - tightened phosphorus and sulfur contents and added requirements for aluminum, titanium, calcium, oxygen, hydrogen contents (see Table 5 of this Edition; Table 2 of Edition 1982); - deleted flat furnace smelting method (see 2.2 of Edition 1982); - modified mechanical properties to agreement requirements and added G20CrMo steel mechanical properties; modified G20CrNiMo mechanical performance index (see 6.5 of this Edition; 2.4 of Edition 1982); Carburizing steels for bearing1 ScopeThis Standard specifies the classifications and codes, order contents, size, shape, technical requirements, test methods, inspection rules, packaging, marks and quality certificate of carburizing steels for bearing. This Standard is applicable to hot-rolled, forged, cold-drawn carburizing steels for bearing and bright round steel (hereinafter referred to as steel) for production of bearing rings and rolling body use. Agreed by the supplier and the purchaser, the steels of other designations and sizes shall be supplied. The requirements shall be specified in the contract.2 Normative referencesThe following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. GB/T 223.5, Methods for chemical analysis of iron, steel and alloy - The reduced molybdosilicate spectrophotometric method for the determination of acid-soluble silicon content GB/T 223.9, Iron steel and alloy - Determination of aluminium content - Chrom azurol S photometric method GB/T 223.11, Iron, Steel and Alloy - Determination of Chromium Content - Visual Titration or Potentiometric Titration Method GB/T 223.19, Methods for chemical analysis of iron, steel and alloy - The neocuproine-chloroform extraction photometric 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 Method GB/T 223.59, Iron, Steel and Alloy - Determination of Phosphorus Content - Bismuth Phosphomolybdate Blue Spectrophotometric Method and Antimony Phosphomolybdate Blue Spectrophotometric Method GB/T 223.60, Methods for chemical analysis of iron steel and alloy - The perchloric acid dehydration gravimetric method for the determination of silicon content GB/T 223.63, Methods for chemical analysis of iron, steel and alloy--The sodium (potassium) periodate photometric method for the determination of manganese content GB/T 223.68, Methods for Chemical Analysis of Iron, Steel and Alloy - The Potassium Iodate Titration Method after Combustion in the Pipe Furnace for the Determination of Sulfur Content GB/T 223.69, Iron, Steel and Alloy-Determination of Carbon Contents- Gas-volumetric Method after Combustion in the Pipe Furnace GB/T 223.77, Methods for chemical analysis of iron, steel and alloy - The flame atomic absorption spectrometric method for the determination of calcium content GB/T 223.82, Steel and iron - Determination of hydrogen content - Inert gas impulse fusion heat conductivity method GB/T 223.84, Steel and iron - Determination of titanium content - Diantipyrylmethane spectrophotometric method GB/T 224-2008, Determination of depth of decarburization of steels GB/T 225, Steel-hardenability test by end quenching (Jominy test) GB/T 226, Etch test for macrostructure and defect of steels GB/T 228.1, Metallic materials - Tensile testing - Part 1. Method of test at room temperature GB/T 229, Metallic Materials - Charpy Pendulum Impact Test Method GB/T 231.1, Metallic materials - Brinell hardness test - Part 1. Test method GB/T 702-2008, Hot-rolled Steel Bars - Dimensions, Shape, Weight and Tolerances GB/T 905-1994, Dimension, shape, weight and tolerance for cold-drawn round, square and hexagonal steels GB/T 908-2008, Forged Bars - Dimensions, Shape, Weight and Tolerances GB/T 1979, Standard diagrams for macrostructure and defect of structural steels GB/T 2101, General provisions on acceptance, package, marking and quality certificate for profile steel GB/T 2975, Steel and Steel Products - Location and Preparation of Test Pieces for Mechanical Testing GB/T 3207-2008, Bright steel GB/T 4162, Forged and Rolled Steel Bars - Method for Ultrasonic Testing GB/T 4336, Carbon and low-alloy steel - Determination of multi-element contents - Spark discharge atomic emission spectrometric method (routine method) GB/T 6394-2002, Metal - Methods for estimating the average grain size GB/T 10561-2005, Steel - Determination of Content of Nonmetallic Inclusions - Micrographic Method Using Standards Diagrams GB/T 11261, Steel and Iron-Determination of oxygen content - The pulse heating inert gas fusion-infra-red absorption method GB/T 15711, Steel Products - Method for Etch Test of Tower Sample GB/T 20066, Steel and Iron-Sampling and Preparation of Samples for the Determination of Chemical Composition GB/T 20123, Steel and iron - Determination of total carbon and sulfur content Infrared absorption method after combustion in an induction furnace (routine method) GB/T 20125, Low-alloy steel - Determination of multi-element contents - Inductively coupled plasma atomic emission spectrometric method YB/T 4307, Iron, Steel and Alloy - Determination of Oxygen, Nitrogen and Hydrogen Contents - TOF-mass Spectroscopy Method after Fusion in a Current of Inert Gas3 Classifications and codes3.1 Classified according to metallurgical quality. a) high-quality steel; b) advanced high-quality steel ("A" is added after designation). 6.2 Smelting method Steel shall be vacuum degassed or electroslag-remelting smelt. High-quality steel shall use electroslag remelting smelting. 6.3 Delivery status The delivery status of steel shall comply with the requirements of Table 7. Agreed by the supplier and the purchaser, indicated in the contract, it can be delivered in other statuses. Table 7 -- Steel delivery status Steel type Delivery status Code Delivery hardness / HBW not greater than G20Cr2Ni4 Other designation Hot rolled round steel Hot rolled WHR (or AR) - - Hot-rolled annealing WHR + SA 241 229 Forged round steel Hot forged WHF - - Hot-forged annealing WHF + SA 241 229 Cold drawn round steel Cold drawn WCD 241 229 Bright round steel Peeled or polished a SF or SP 241 229 a Agreed by both parties, it can be delivered in coil status. 6.4 Delivery hardness The delivery hardness of steel shall comply with the provisions of Table 7. The hardness of other delivery status of steel shall be agreed by the supplier and the purchaser, indicated in the contract. 6.5 Mechanical properties According to user requirements, steel mechanical properties can be tested. The longitudinal mechanical properties of steel of which the sample is prepared by heat treatment through rough blank shall be determined in accordance with the requirements of Table 8. 6.13.3 Required by the purchaser, agreed by the supplier and the purchaser, indicated in the contract,... ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. 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