GB/T 34484.1-2017 PDF in English
GB/T 34484.1-2017 (GB/T34484.1-2017, GBT 34484.1-2017, GBT34484.1-2017)
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Heat-treatable steels -- Part 1: Non-alloy steels
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Standards related to (historical): GB/T 34484.1-2017
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GB/T 34484.1-2017: PDF in English (GBT 34484.1-2017) GB/T 34484.1-2017
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.140.10
H 40
Heat-treatable steels - Part 1: Non-alloy steels
(ISO 683-1:2016, Heat-treatable steels, alloy steels and free-cutting
steels - Part 1: Non-alloy steels for quenching and tempering, MOD)
ISSUED ON: OCTOBER 14, 2017
IMPLEMENTED ON: JULY 01, 2018
Issued by: General Administration of Quality Supervision, Inspection and
Quarantine;
Standardization Administration of the People's Republic of
China.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative references ... 4
3 Classification and codes ... 6
4 Ordering content ... 6
5 Size, shape, weight ... 6
6 Technical requirements ... 6
6.1 Designation and chemical composition ... 6
6.2 Smelting method ... 7
6.3 Delivery state... 7
6.4 Mechanical properties ... 7
6.5 Macrostructure ... 11
6.6 Grain size ... 11
6.7 Surface quality ... 11
6.8 Special requirements... 11
7 Test methods ... 11
8 Inspection rules ... 12
8.1 Inspection and acceptance... 12
8.2 Batching rules... 12
8.3 Sampling quantity and sampling site ... 12
8.4 Reinspection and rules for determination ... 12
9 Packaging, marks and quality certificate ... 13
Annex A (informative) Structural changes between this Part and ISO 683-
1:2016 ... 14
Annex B (informative) Technical differences between this Part and ISO 683-
1:2016 as well as reasons ... 15
Annex C (informative) Comparison on domestic and foreign designations ... 18
Annex D (normative) Sampling positions for mechanical properties test ... 19
Foreword
GB/T 34484 “Heat-treatable steels” consists of two parts:
- Part 1: Non-alloy steels;
- Part 2: Alloy steels for quenching and tempering.
This Part is Part 1 of GB/T 34484.
This Part was drafted in accordance with the rules given in GB/T 1.1-2009.
This Part uses redrafting method to modify and adopt ISO 683-1:2016 “Heat-
treatable steels, alloy steels and free-cutting steels - Part 1: Non-alloy steels for
quenching and tempering”.
Compared with ISO 683-1:2016, this Part made structural adjustments. Annex
A lists the comparison on sub-clause number between this Part and ISO 683-
1:2016.
This Part has technical differences compared with ISO 683-1:2016. The terms
involved in these differences have been marked by a vertical single line (∣) on
the outer margins. Annex B lists corresponding technical differences and
reasons.
For the ease of use, this Part made the following editorial modifications:
- modified the standard name to “Heat-treatable steels - Part 1: Non-alloy
steels”;
- deleted the Bibliography in ISO 683-1:2016.
This Part was proposed by China Iron and Steel Association.
This Part shall be under the jurisdiction of National Technical Committee on
Steels of Standardization Administration of China (SAC/TC 183).
The drafting organizations of this Part: Northeast Special Steel Group Beiman
Special Steel Co., Ltd., Metallurgical Industry Information Standards Institute.
Main drafters of this Part: Qian Chengyun, Yan Chengming, Luan Yan.
Heat-treatable steels - Part 1: Non-alloy steels
1 Scope
This Part of GB/T 34484 specifies classification and codes, ordering content,
size, shape, weight, technical requirements, test methods, inspection rules,
packaging, marks and quality certificate for heat-treatable non-alloy steels.
This Part is applicable to the rolled bars with a nominal diameter or thickness
not greater than 310mm (hereinafter referred to as the steel).
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 222, Permissible tolerances for chemical composition of steel products
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 223.23, 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 223.53, Methods for chemical analysis of iron, steel and alloy - The
flame atomic absorption spectrophotometric method for the determination of
copper content
GB/T 223.60, Methods for chemical analysis of iron, steel and alloy - The
perchloric acid dehydration gravimetric method for the determination of
silicon content
GB/T 223.62, Methods for chemical analysis of iron, steel and alloy; The butyl
acetate extraction photometric method for the determination of phosphorus
content
3 Classification and codes
According to heat treatment delivery state, the classification and codes of the
steel are:
a) Normalizing N;
b) Quenching and tempering QT.
4 Ordering content
The contract or order placed under this Part shall include the following:
a) Reference to this Part;
b) Product name;
c) Designation;
d) Smelting method (see 6.2);
e) Delivery state (see 6.3);
f) Weight (or quantity);
g) Size and shape (see Clause 5);
h) Processing method;
i) Special requirements.
5 Size, shape, weight
5.1 The size, shape and allowable deviation of the steel shall meet the relevant
regulations of GB/T 702. Specific requirements shall be specified in the contract.
5.2 The steel is delivered by actual weight. After negotiation between the
supplier and the purchaser, it can also be delivered by theoretical weight.
6 Technical requirements
6.1 Designation and chemical composition
6.1.1 The designation and chemical composition (melting analysis) of the steel
6.5 Macrostructure
6.5.1 There shall be no visible residual shrinkage holes, bubbles, cracks,
inclusions, peeling, and white spots on the acid immersion macrostructure test
piece of the steel cross section.
6.5.2 The conforming level of acid leaching macrostructure of the steel shall
meet the requirements of Table 5.
Table 5 -- Macrostructure structure defect and conforming level
6.6 Grain size
According to the requirements of the purchaser, the actual grain size of the steel
can be inspected. The grain size is level 5 or finer.
6.7 Surface quality
The surface of the steel shall be smooth, without cracks, folds, scars and scales.
If the above defects exist, local grinding is allowed. However, the maximum
grinding point shall ensure the minimum allowable size of the steel.
6.8 Special requirements
Agreed by the supplier and the purchaser and indicated in the contract, it can
carry out non-metallic inclusion inspection, ultrasonic inspection. The specific
conforming level is determined through negotiation between the supplier and
the purchaser.
7 Test methods
7.1 The inspection items and test methods of each batch of the steel shall meet
the requirements of Table 6.
7.2 The chemical composition of the steel is analyzed according to GB/T 4336,
GB/T 20123 or general test methods. However, the arbitration shall be based
on the regulations of GB/T 223.11, GB/T 223.23, GB/T 223.26, GB/T 223.53,
GB/T 223.60, GB/T 223.62, GB/T 223.64, GB/T 223 .69, GB/T 223.72.
Table 6 -- Inspection items
8 Inspection rules
8.1 Inspection and acceptance
8.1.1 The inspection and acceptance of the steel exiting the factory are carried
out by the supplier’s quality and technical supervision department.
8.1.2 The supplier must ensure that the delivered steel meets the provisions of
this Part or the contract. When necessary, the purchaser has the right to inspect
and accept any inspection items specified in this Part or the contract.
8.2 Batching rules
The steel shall be inspected and accepted by batches. Each batch shall be
composed of steels of the same designation, the same heat number, the same
variety, the same size, and the same heat treatment system (heat).
8.3 Sampling quantity and sampling site
The sampling quantity and sampling site of each batch of steel inspection items
shall meet the requirements of Table 6.
8.4 Reinspection and rules for determination
The reinspection and determination of steel shall meet the requirements of
GB/T 17505.
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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