GB/T 3203-2016 PDF in English
GB/T 3203-2016 (GB/T3203-2016, GBT 3203-2016, GBT3203-2016)
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Carburizing steels for bearing
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GB/T 3203-2016: PDF in English (GBT 3203-2016) GB/T 3203-2016
GB
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 Contents
Foreword ... 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 ... 19
Foreword
This 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 bearing
1 Scope
This 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 references
The 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 Gas
3 Classifications and codes
3.1 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 PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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