GB/T 28417-2023 English PDF (GBT28417-2023)

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GB/T 28417-2023: Carbon bearing steel
GB/T 28417-2023
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.140.20
CCS H 40
GB/T 28417-2023
Replacing GB/T 28417-2012
Carbon bearing steel
ISSUED ON: NOVEMBER 27, 2023
IMPLEMENTED ON: JUNE 01, 2024
Issued by: State Administration for Market Regulation;
Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Normative references ... 5
3 Terms and definitions ... 7
4 Classification ... 7
5 Ordering content ... 7
6 Dimensions, shape, weight ... 8
7 Technical requirements ... 9
8 Test methods ... 12
9 Inspection rules ... 13
10 Packaging, marking and quality certificate ... 14
Annex A (informative) Table of comparison of designations in this document and
foreign designations ... 15
Foreword
This document was drafted in accordance with the provisions of GB/T 1.1-2020
“Directives for standardization - Part 1: Rules for the structure and drafting of
standardizing documents”.
This document replaces GB/T 28417-2012 “Carbon bearing steel”. Compared with
GB/T 28417-2012, in addition to structural adjustments and editorial changes, the main
technical changes are as follows:
a) ADD the classification (see Clause 4);
b) MODIFY the requirements for dimensions and shape (see 6.1 and 6.2 of this
document, 4.1 and 4.2 of the 2012 edition);
c) ADD the requirements for weight (see 6.3 of this document);
d) MODIFY the chemical composition (see 7.1 of this document, 5.1 of the 2012
edition);
e) ADD the requirements for mechanical properties (see 7.4 of this document);
f) DELETE the requirement for macrostructure rating according to ASTM standards
(see 5.4.3 of the 2012 edition);
g) MODIFY the qualified level of non-metallic inclusions (see 7.7 of this document,
5.5 of the 2012 edition);
h) MODIFY the requirements for decarburized layer (see 7.8 of this document, 5.6
of the 2012 edition);
i) MODIFY the internal quality to ultrasonic testing (see 7.10 of this document, 5.9.2
of the 2012 edition);
j) ADD the surface quality test requirements for high-grade high-quality steel (see
7.11.2 of this document);
k) MODIFY the test methods (see Clause 8 of this document, Clause 6 of the 2012
edition);
l) MODIFY the batching rules (see 9.2 of this document, 7.2 of the 2012 edition).
Attention is drawn to the possibility that some of the elements of this document may be
the subject of patent rights. The issuing authority of this document shall not be held
responsible for identifying any or all such patent rights.
This document was proposed by China Iron and Steel Association.
Carbon bearing steel
1 Scope
This document specifies the classification, ordering content, dimensions, shape, weight,
technical requirements, test methods, inspection rules, packaging, marking and quality
certificate of carbon bearing steel.
This document applies to hot-rolled steel bars (hereinafter referred to as steel bars) with
a nominal diameter of 20 mm ~ 150 mm for manufacturing automobile hub bearing
units. Steel bars for other purposes can refer to this document.
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 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 223.12 Methods for chemical analysis of iron, steel and alloy - The sodium
carbonate separation-diphenyl carbazide photometric method for the determination
of chromium content
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 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 4336 Carbon and low-alloy steel - Determination of multi-element contents -
Spark discharge atomic emission spectrometric method (routine method)
GB/T 6394 Determination of estimating the average grain size of metal
GB/T 8170-2008 Rules of rounding off for numerical values and expression and
judgement of limiting values
GB/T 10561 Determination of content of nonmetallic inclusions in steel -
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 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 32547 Method for magnetic flux leakage testing of round steel
GB/T 38683-2020 Method of ultrasonic testing for large inclusions in bearing steel
3 Terms and definitions
There are no terms or definitions to be defined in this document.
4 Classification
Steel bars are classified into the following two categories according to metallurgical
quality:
a) High-quality steel;
b) High-grade high-quality steel (with “A” added after the designation).
5 Ordering content
The contract or order for ordering according to this document shall include the
following contents:
a) serial number of this document;
b) designation;
c) product name;
d) specification;
e) weight (or quantity);
f) delivery status;
g) special requirements.
6 Dimensions, shape, weight
6.1 Dimensions
6.1.1 Dimensions and allowable deviations
The dimensions and allowable deviations of steel bars shall comply with the provisions
of Group 2 in GB/T 702-2017. Upon request of the purchaser, after negotiation between
the supplier and purchaser and indicated in the contract, steel bars with other
dimensions and allowable deviations can be provided.
6.1.2 Length
6.1.2.1 The usual length of steel bars is 4000 mm ~ 9000 mm.
6.1.2.2 Steel bars shall be delivered in full length within the specified length range, and
the difference between the longest and shortest steel bars in each bundle shall not
exceed 1500 mm.
6.1.2.3 The length tolerance of steel bars delivered in fixed length or multiple lengths
is ൅50 0 mm.
6.2 Appearance
6.2.1 Out-of-roundness
The out-of-roundness of steel bars shall comply with the provisions of GB/T 702-2017.
Upon request of the purchaser, after negotiation between the supplier and purchaser and
indicated in the contract, steel bars with other out-of-roundness can be provided.
6.2.2 Curvature
The curvature of steel bars shall comply with the provisions of Group 2 in GB/T 702-
2017. Upon request of the purchaser, after negotiation between the supplier and
purchaser and indicated in the contract, steel bars with other curvatures can be provided.