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GB/T 33972-2017Hot rolled steel sheet and strip for bogie frame of high-speed train (English PDF)

高速列车转向架构架用热轧钢板及钢带

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Issued by

SAMR; SAC

Level / Type

National · Recommended

Issue date

July 12, 2017

Implementation date

April 1, 2018

Scope

GB/T 33972-2017 is the English-translated version of 高速列车转向架构架用热轧钢板及钢带.

GB/T 33972-2017 is the Chinese standard for the hot rolled steel sheet and strip used for the bogie frames of high-speed trains, in thicknesses of 3.0 mm to 25.0 mm, and for inter-city train and metro rolling stock.

It fixes the designation, ordering content, dimensions, shape and weight, technical requirements, test methods, inspection rules and the packaging, marking and quality certificate.

Grades are named from the pinyin initials Q, G and Z plus the specified minimum yield strength, as in Q355GZ. The test table sets the sampling and the method for chemical composition, tensile, bend and impact tests, grain size, non-metallic inclusions, banded structure and non-destructive testing.

An informative annex calculates an atmospheric corrosion resistance index, which must reach 6.0 where corrosion resistance is required. Issued on 12 July 2017, it has applied since 1 April 2018.

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Document preview — GB/T 33972-2017

National Standard of the People's Republic of China

ICS: 77.140.50
Classification: H 46

Issued by: State Administration for Market Regulation; Standardization Administration of the PRC

Foreword3
1 Scope4
2 Normative references4
3 Designation6
4 Ordering content6
5 Dimensions, shape and weight7
6 Technical requirements7
7 Test methods10
8 Inspection rules11
9 Packaging, marking and quality certification11
Annex A (Informative) Guide for evaluation of steel atmospheric corrosion resistance12

Foreword

This Standard was drafted in accordance with the rules given in GB/T 1.1-2009.

1 Scope

This Standard specifies the designation, ordering content, dimensions, shape, weight, technical requirements, test methods, inspection rules, packaging, marking and quality certification of hot rolled steel sheet and strip for bogie frame of high-speed train.

This Standard applies to hot rolled steel sheet and strip for bogie frame of high-speed train, with a thickness of 3.0 mm ~ 25.0 mm, as well as hot rolled steel sheet and strip for the rail transit such as inter-city trains and subways (hereinafter referred to as steel sheet and strip).

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 document.

GB/T 222, Permissible tolerances for chemical composition of steel products

GB/T 223.5, Steel and iron - Determination of acid-soluble silicon and total silicon content - Reduced molybdosilicate spectrophotometric method

GB/T 223.11, Iron, steel and alloy - Determination of chromium content - Visual titration or potentiometric titration method

GB/T 223.14, Methods for chemical analysis of iron, steel and alloy - The n-benzoy-n-phenylhydroxylamine extraction photometric method for the determination of vanadium 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 223.40, Iron, steel and alloy - Determination of niobium content by the GB/T 13298, Inspection methods of microstructure for metals

GB/T 13299, Steel - Determination of microstructure

GB/T 14977, General requirement for surface condition of hot-rolled steel plates

GB/T 17505, Steel and steel products - General technical delivery requirements

GB/T 20066, Steel and iron-sampling and preparation of samples for the determination of chemical composition

GB/T 20124, Steel and iron - Determination of nitrogen content - Thermal conductimetric method after fusion in a current of inert gas

GB/T 20125, Low-alloy steel - Determination of multi-element contents - Inductively coupled plasma atomic emission spectrometric method

3 Designation

Designation of steels consists of four parts, including the Chinese pinyin initials "Q", "G" and "Z" of "Qu" representing yield strength of steels, "Gao" of high-speed trains and "Zhuan" of bogie frame, and the specified minimum yield strength value [Translator note. "Qu" means yield; "Gao" means high-speed; "Zhuan" means bogie].

EXAMPLE: Q355GZ Q - the Chinese pinyin initial of "Qu" of steels' yield strength;

G - the Chinese pinyin initial of "Gao" of high-speed trains;

Z - the Chinese pinyin initial of "Zhuan" of bogie frame;

355 - the specified yield strength value, in MPa.

4 Ordering content

Contracts or orders based on this Standard shall include the following content.

a) a reference to this Standard;

b) product type (steel sheet and strip);

c) designation;

d) delivery condition;

5 Dimensions, shape and weight

6 Technical requirements

6.9.1 The surface of steel sheet and strip shall be free from cracks, scars, folds, bubbles, inclusions, layers and other defects detrimental to use.

6.9.2 The surface of steel sheet and strip allows local pits, indentations, scratches and other slight deficiencies which are not greater than half of the thickness tolerance of thickness, but the minimum thickness of steel sheet shall be ensured.

6.9.3 As agreed on by the purchaser and the supplier, the surface quality of steel sheet and strip can be as specified in GB/T 14977.

6.10 Other requirements

As agreed on by the purchaser and the supplier, steel sheet and strip may also be tested for other items including steel atmospheric corrosion resistance evaluation. For the evaluation of atmospheric corrosion resistance see Annex A.

7 Test methods

7.1 The chemical composition of steels shall be carried out as specified in GB/T 222,

GB/T 223.5, GB/T 223.11, GB/T 223.14, GB/T 223.23, GB/T 223.26, GB/T 223.40,

GB/T 223.53, GB/T 223.62, GB/T 223.63, GB/T 223.84, GB/T 223.85, GB/T 4336,

GB/T 20124 and GB/T 20125 or general methods. However, during arbitration, it shall be carried out as specified in GB/T 222, GB/T 223.5, GB/T 223.11, GB/T 223.14, GB/T 223.23, GB/T 223.26, GB/T 223.40, GB/T 223.53, GB/T 223.62, GB/T 223.63, GB/T 223.84 and GB/T 223.85.

7.2 The test items and test methods of steel sheet and strip shall be as specified in Table 6.

8 Inspection rules

9 Packaging, marking and quality certification

Annex A (Informative) Guide for evaluation of steel atmospheric corrosion resistance

A.1 General rules

When steel sheet and strip have a good atmospheric corrosion resistance property, the requirement is that the corrosion resistance index calculated according to this Annex shall be 6.0 or more.

A.2 Range

This Annex provides one method for the evaluation of atmospheric corrosion resistance of low-alloy steels through the chemical composition.

This Method is to calculate the corrosion resistance index of steels based on the predictive equation of the chemical composition of steels.

There are multiple corrosion resistance indexes in use all over the world, so it is necessary to consider different service environments and chemical compositions of steels when selecting one index. Based on the differences of service environments and chemical composition of steels, any index may be inapplicable; and therefore, it is necessary for the purchaser and the supplier together to decide which index to use and the size of the index in the predicted service environment.

A.3 Terminology

Low-alloy steels refers to carbon steels which contain a total content of alloying elements greater than 1% but less than 5%.

NOTE: Most "low-alloy weathering resistant steels" contain additions of elements Cr and Cu, which may also contain additions of Si, Ni, P or other alloying elements which may increase the atmospheric corrosion resistance property.

A.4 Method

A.4.1 Legault and Leckie published the equation predicting the corrosion loss of low-alloy steels after 15.5 years of exposure to different atmospheric environments based on the chemical composition of steels. This equation was based on the extensive data published by Larrabee and Coburn.

A.4.2 For use, Legault-Leckie equation in an industrial environment (Kearny, N.J.) was modified to allow calculation of the atmospheric corrosion resistance index based on […]

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.

Referenced standards

Normative references

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