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GB/T 18254-2016 (GB/T18254-2016)

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GB/T 18254-2016: PDF in English (GBT 18254-2016)

GB/T 18254-2016
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.140.10
H 40
Replacing GB/T 18254-2002
High-carbon Chromium Bearing Steels
ISSUED ON. AUGUST 29, 2016
IMPLEMENTED ON. JULY 1, 2017
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine of the People's Republic of China;
Standardization Administration of the People's Republic of
China.
Table of Contents
Foreword ... 3 
1 Application Scope ... 6 
2 Normative References ... 6 
3 Classification and Codes ... 8 
4 Ordering Content ... 9 
5 Dimensions, Shape and Weight ... 9 
6 Technical Requirements ... 11 
7 Test Method ... 19 
8 Inspection Rules ... 22 
9 Packaging, Marking and Quality Certification ... 25 
Annex A (Normative) Standard Diagrams of High-carbon Chromium Bearing
Steels ... 26 
Annex B (Normative) Test Method for Bluing Fracture ... 43 
Annex C (Normative) Sampling Diagrams for Microstructure, Carbide
Inhomogeneity and Microporosity ... 45 
Foreword
This Standard was drafted in accordance with the rules given in GB/T 1.1-2009.
This Standard replaces GB/T 18254-2002, High-carbon Chromium Bearing Steel.
Compared with GB/T 18254-2002, the main changes of the technical content of this
Standard are as follows.
-- it cancels the varieties of “steel tubes” (see 1, 4.1.1.5, 5.1.3, 5.3.1.9, 5.3.1.10,
5.11.3 and 5.12.4 of edition 2002);
-- it adds “classification and codes” (see Article 3);
-- it adds “end use” and “surface condition” in “ordering content” (see Article 4; Article
3 of edition 2002);
-- steels are classified into three quality grades, i.e. quality steels, high-grade quality
steels and super-grade quality steels, in accordance with the metallurgical quality
(see Table 1, 2, 5, 9, 10, 14, 15, 16; 4.1.1, 4.1.1.3, 4.2.1, Table 3, 6, 7, 5.8, Table
8 and 9 of edition 2002);
-- it changes the upper limits of delivery lengths of hot-rolled round steels and forged
round steels (see 5.1.2.1; 4.1.2.1 of edition 2002);
-- it changes the “coil weight” of wire rod (see 5.3; 4.1.2.2 of edition 2002);
-- it tightens the bend indexes of hot-rolled round steels (see Table 3; Table 2 of
edition 2002);
-- it cancels designation GCr4 and its relevant technical requirements (see Table 3,
5, 12 of edition 2002);
-- it cancels the specification of Ni + Cu ≤ 0.50% (see Table 3 of edition 2002);
-- it adds designation G8Cr15 and its relevant technical requirements (see Table 4,
8, 6.8, Table 21);
-- it tightens the content indexes of nickel, phosphorus, Sulphur and oxygen (see
Table 4, 5; Table 3 of edition 2002);
-- it adds the assessment indexes of aluminum, titanium, calcium, arsenic, antimony
and lead (see Table 5; 5.1.2 of edition 2002);
-- it changes the hardness of softened annealed steels (see Table 8; Table 5 of
edition 2002);
-- it adds the test items and standard diagrams of “centre segregation” (Table 9 and
standard diagram 4 of Annex A; Table 6 of edition 2002);
High-carbon Chromium Bearing Steels
1 Application Scope
This Standard specifies the classification and codes, ordering content, dimensions,
shape, technical requirements, test methods, inspection rules, packaging, marking and
quality certification of high-carbon chromium bearing steels.
This Standard applies to hot-rolled and forged round steels, round wire rods and cold-
drawn round steels (bar or coil shape) of high-carbon chromium bearing steels for
bearing rings and rollers (hereinafter referred to as steels).
Steels or steel billets of other varieties or specifications can be supplied as agreed on
by the supplier and the purchaser; the specific requirements shall be stated in the
contract.
2 Normative References
The following referenced documents are indispensable for the application of this
document. For dated references, only the edition dated applies to this document. For
undated references, the latest edition of the referenced documents (including all
amendments) applies to this Standard.
GB/T 223.5, Steel and Iron – Determination of Acid-soluble Silicon and Total Silicon
Content - Reduced Molybdosilicate Spectrophotometric Method
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 223.23, 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 223.29, Iron, Steel and Alloy – Determination of Lead Content – Carrier
Precipitation-Xylenol Orange Spectrophotometric Method
GB/T 223.31, Iron, Steel and Alloy – Determination of Arsenic Content – Distillation-
molybdenum Blue Spectrophotometric Method
GB/T 223.47, Methods for Chemical Analysis of Iron, Steel and Alloy – The Carrier
Precipitation-Molybdenum Blue Photometric Method for the Determination of
Antimony Content
GB/T 223.50, Methods for Chemical Analysis of Iron, Steel and Alloy – The
Phenylfuorone-CTMAB Direct Photometric Method for the Determination of Tin
Content
GB/T 223.53, Methods for Chemical Analysis of Iron, Steel and Alloy – The Flame
Atomic Absorption Spectrophotometric Method for the Determination of Copper
Content
GB/T 223.62, Methods for Chemical Analysis of Iron, Steel and Alloy – The Butyl
Acetate Extraction Photometric Method for the Determination of Phosphorus
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 223.77, Methods for Chemical Analysis of Iron, Steel and Alloy – The Flame
Atomic Absorption Spectrometric Method for the Determination of Calcium Content
GB/T 223.85, Iron, Steel and Alloy – Determination of Sulfur Content – Infrared
Absorption Method after Combustion in an Induction Furnace
GB/T 223.86, Iron, Steel and Alloy – Determination of Total Carbon Content –
Infrared Absorption Method after Combustion in an Induction Furnace
GB/T 224-2008, Determination of Depth of Decarburization of Steels
GB/T 226, Test Method for Macrostructure and Defect of Steel by Etching
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 1814, Inspection Method for Steel Work Fractures
GB/T 1979, Standard Diagrams for Macrostructure and Defect of Structure Steels
GB/T 2101, General Requirement of Acceptance, Packaging, Marking and
Certification for Section Steel
GB/T 4336, Carbon and Low-Alloy Steel – Determination of Multi-Element Contents
– Spark Discharge Atomic Emission Spectrometric Method (Routine Method)
GB/T 10561-2005, Steel – Determination of Content of Nonmetallic Inclusions –
Micrographic Method Using Standard Diagrams
GB/T 11261, Steel and Iron – Determination of Oxygen Content – The Pulse
Heating Inert Gas Fusion-Infra-Red Absorption Method
GB/T 14981-2009, Dimension, Shape, Mass and Tolerance for Hot-rolled Round
Wire Rod
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
GB/T 5293, Metallic Materials - Forging Test
3 Classification and Codes
3.1 Steels are specified into the following in accordance with metallurgical quality.
a) quality steels;
b) high-grade quality steels (adding “A” after designation);
c) super-grade quality steels (adding “E” after designation).
3.2 Steels are classified into the following in accordance with casting process.
a) moulded steels;
b) continuously cast steels.
3.3 Steels are classified into the following in accordance with processing method for
application.
a) steels for pressure processing, UP;
b) steels for machining, UC.
3.4 Steels are classified into the following in accordance with end use.
a) for rings, T;
b) for rollers, G;
Table 3 – Bend of Steels dimensions in millimeters
Steel type
Bend
not greater than
Bend per meter Total bend
Hot-rolled round steels 3.0 0.3% × steels’ length
Hot-rolled annealed round st...
......
 
(Above excerpt was released on 2017-04-29, modified on 2021-06-07, translated/reviewed by: Wayne Zheng et al.)
Source: https://www.chinesestandard.net/PDF.aspx/GBT18254-2016