GB/T 34484.2-2018 PDF in English
GB/T 34484.2-2018 (GB/T34484.2-2018, GBT 34484.2-2018, GBT34484.2-2018)
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GB/T 34484.2-2018 | English | 320 |
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Heat-treatable steels -- Part 2: Alloy steels for quenching and tempering
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Standards related to (historical): GB/T 34484.2-2018
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GB/T 34484.2-2018: PDF in English (GBT 34484.2-2018) GB/T 34484.2-2018
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.140.10
H 40
Heat-treatable steels - Part 2.Alloy steels for quenching and
tempering
(ISO 683-2.2016, Heat-treatable steels, alloy steels and free-cutting steels - Part
2.Alloy steels for quenching and tempering, MOD)
ISSUED ON. SEPTEMBER 17, 2018
IMPLEMENTED ON. JUNE 01, 2019
Issued by. State Administration for Market Regulation;
National Standardization Administration.
Table of Contents
Foreword... 3
1 Scope... 4
2 Normative references... 4
3 Ordering content... 6
4 Dimensions, shape, weight... 6
5 Technical requirements... 7
5.1 Designation and chemical composition... 7
5.2 Smelting method... 9
5.3 Delivery status... 9
5.4 Mechanical properties... 10
5.5 Macrostructure... 13
5.6 Non-metallic inclusions... 13
5.7 Grain size... 13
5.8 Ultrasonic testing... 13
5.9 Remanence... 14
5.10 Surface quality... 14
6 Test method... 14
7 Inspection rules... 15
7.1 Inspection and acceptance... 15
7.2 Group-batching rules... 15
7.3 Sampling quantity and sampling location... 15
7.4 Re-inspection and determination rules... 15
8 Packaging, marking, quality certificate... 15
Appendix A (Informative) Structural changes of this Part compared with ISO 683-
2.2016... 16
Appendix B (Informative) Technical differences between this Part and ISO 683-2.2016
and the reasons... 18
Appendix C (Informative) Comparison of domestic and foreign designations... 21
Appendix D (Normative) Sampling position for mechanical properties test... 22
Foreword
GB/T 34484 "Heat-treatable steel" is divided into two parts.
- Part 1.Non-alloy steel;
- Part 2.Alloy steels for quenching and tempering.
This Part is Part 2 of GB/T 34484.
This Part was drafted in accordance with the rules given in GB/T 1.1-2009.
This Part uses the redrafting method, to modify and adopt ISO 683-2.2016 "Heat-
treatable steels, alloy steels and free-cutting steels - Part 2.Alloy steels for quenching
and tempering".
Compared with ISO 683-2.2016, this Part has structural adjustments. Appendix A lists
the comparison of chapter and article numbers between this Part and ISO 683-2.2016.
There are technical differences between this Part and ISO 683-2.2016.The clauses
involved in these differences have been marked by a vertical single line (丨) in the outer
margin position. Appendix B gives a list of corresponding technical differences and
their reasons.
For ease of use, this Part has made the following editorial changes.
- CHANGE the standard name from "Heat-treatable steels, alloy steels and free-
cutting steels - Part 2.Alloy steels for quenching and tempering" to "Heat-treatable
steels - Part 2.Alloy steels for quenching and tempering";
- DELETE the informative Appendix D and references in ISO 683-2.2016.
This Part was proposed by the China Iron and Steel Association.
This Part shall be under the jurisdiction of the National Technical Committee for Steel
Standardization (SAC/TC 183).
Drafting organizations of this Part. Daye Special Steel Co., Ltd., Metallurgical Industry
Information Standards Research Institute, Jiangyin Xingcheng Special Steel Co., Ltd.,
Xiwang Special Steel Co., Ltd.
The main drafters of this Part. Chen Jun, Yan Chengming, Li Bopeng, Hu Ruihai, Bai
Yun, Meng Yu, Zhang Lingtong, Li Wenshuang.
Heat-treatable steels - Part 2.Alloy steels for quenching and
tempering
1 Scope
This Part of GB/T 34484 specifies the ordering content, size, shape, weight, technical
requirements, test methods, inspection rules, packaging, marking, quality certificate of
alloy steels delivered in quenched and tempered state.
This Part applies to rolled round steel which has a nominal diameter not exceeding 310
mm and rolled square steel which has a nominal side length not exceeding 280 mm
(hereinafter referred to as steel).
2 Normative references
The following documents are essential to the application of this document. For the dated
documents, only the versions with the dates indicated are applicable to this document;
for the undated documents, only the latest version (including all the amendments) is
applicable to this standard.
GB/T 222 Permissible tolerances for chemical composition of steel products
GB/T 223.9 Iron, steel and alloy - Determination of aluminium content - Chrome
azurol S photometric method
GB/T 223.11 Iron, steel and alloy - Determination of chromium content - Visual
titration or potentiometric titration method (GB/T 223.11-2008, ISO 4937.1986,
MOD)
GB/T 223.13 Methods for chemical analysis of iron, steel and alloy - The
ammonium ferrous sulfate titration method for the determination of vanadium
content
GB/T 223.17 Methods for chemical analysis of iron, steel and alloy - The diantipyryl
methane spectrophotometry for the determination of titanium 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 6394 Determination of estimating the average grain size of metal
GB/T 10561-2005 Steel - Determination of content of nonmetallic inclusions -
Micrographic method using standards diagrams (ISO 4967.1998, IDT)
GB/T 17505 Steel and steel products - General technical delivery requirements
(GB/T 17505-2016, ISO 404.2013, MOD)
GB/T 20066 Steel and iron - Sampling and preparation of samples for the
determination of chemical composition (GB/T 20066-2006, ISO 14284.1996, IDT)
GB/T 20123 Steel and iron - Determination of total carbon and sulfur content
Infrared absorption method after combustion in an induction furnace (routine
method)
3 Ordering content
The contract or order for ordering according to this Part shall include the following
content.
a) This Part number;
b) Product name;
c) Designation;
d) Smelting method (see 5.2);
e) Surface hardness (see 5.4);
f) Grain size (see 5.7);
g) Ultrasonic testing (see 5.8);
h) Remanence (see 5.9);
i) Weight (or quantity);
j) Dimensions and shape (see Chapter 4);
k) Special requirements.
4 Dimensions, shape, weight
4.1 The dimensions and allowable deviations of steel shall comply with the provisions
of Group 2 in GB/T702-2017.
7 Inspection rules
7.1 Inspection and acceptance
7.1.1 Inspection and acceptance of steel products before leaving factory shall be
conducted by the supplier's quality department.
7.1.2 The supplier shall ensure that the delivered steel products comply with the
provisions of this Part or the contract. If necessary, the purchaser shall have the right to
inspect and accept any inspection item specified in this Part or the contract.
7.2 Group-batching rules
Steel products shall be inspected and accepted in batches. Each batch shall consist of
steel products of the same designation, furnace number, size, heat treatment system
(furnace).
7.3 Sampling quantity and sampling location
The sampling quantity and sampling location of steel products shall comply with the
provisions of Table 6.
7.4 Re-inspection and determination rules
7.4.1 The re-inspection and determination rules of steel products shall be implemented
in accordance with the provisions of GB/T 17505.
7.4.2 Steel products that fail the re-inspection are allowed to be re-heat treated and
submitted for acceptance as a new batch. The re-heat treatment can be tempered
multiple times, but shall not exceed two quenching.
8 Packaging, marking, quality certificate
The packaging, marking, quality certificate of steel products shall comply with the
relevant provisions of GB/T 2101.
...... Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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