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GB/T 3273-2026Hot rolled steel sheet and strip for automobile frames (English PDF)

汽车大梁用热轧钢板及钢带

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Issued by

SAMR; SAC

Level / Type

National · Recommended

Issue date

March 31, 2026

Implementation date

October 1, 2026

Scope

GB/T 3273-2026 is the English-translated version of 汽车大梁用热轧钢板及钢带.

GB/T 3273-2026 covers the hot-rolled steel plates and strips used for the longitudinal and transverse beams of automobile frames, in thicknesses not exceeding 18.0 mm.

It classifies them by edge condition (cut edge EC, mill edge EM), thickness accuracy (PT.A, PT.B), surface treatment (rolled SR, acid pickling SA, eco pickled EPS) and surface quality grade (FA, FB), and explains the designation, made of the minimum tensile strength in MPa followed by the letter L, as in 700L.

It then sets what a contract or order must state, the smelting and delivery conditions, the technical requirements, test methods, inspection rules and the packaging, marking and quality certificate.

It replaces GB/T 3273-2015, was issued on 31 March 2026 and applies from 1 October 2026.

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Document preview — GB/T 3273-2026

National Standard of the People's Republic of China

ICS: 77.140.50
Classification: H 46
Replacing: GB/T 3273-2015

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

Foreword3
1 Scope5
2 Normative References5
3 Terms and Definitions6
4 Classification, Codes and Notations for Designations6
5 Ordering Details7
6 Manufacturing Process8
7 Technical Requirements9
8 Test Methods12
9 Inspection Rules13
10 Packaging, Marking, and Quality Certificate13
Appendix A (Informative) Comparison of Designations in this Document with Similar Designations in Foreign Standards14

1 Scope

This Document specifies the classification, codes, notations for designations, ordering details, manufacturing process, technical requirements, test methods, inspection rules, packaging, marking, and quality certificate for hot-rolled steel plates and strips used in automobile frame.

This Document applies to hot-rolled steel plates and strips (hereinafter referred to as "plates and strips") with a thickness not exceeding 18.0 mm used in the manufacture of longitudinal and transverse beams of automobile frames.

2 Normative References

The provisions in following documents become the essential provisions of this Document through reference in 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 Document.

GB/T 222 Steel and alloy - Permissible tolerances for chemical composition of finished products

GB/T 223 (all parts) Iron, Steel and Alloy - Methods for Chemical Analysis

GB/T 228.1 Metallic materials - Tensile testing - Part 1: Method of test at room temperature

GB/T 229 Metallic materials - Charpy pendulum impact test method

GB/T 232 Metallic materials - Bend test method

GB/T 247 General rule of package, mark and certification for steel plate, sheet and strip

GB/T 709 Dimension, shape, weight and tolerance for hot-rolled steel strip, plate and sheet

GB/T 2975 Steel and steel products - Location and preparation of samples and test pieces for mechanical testing

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 Rules of rounding off for numerical values & expression and judgement of limiting values

GB/T 13298 Inspection methods of microstructure for metals

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 20123 Steel and iron - Determination of total carbon and sulfur content - Infrared absorption method after combustion in an induction furnace (routine method)

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

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

GB/T 20126 Unalloyed Steel - Determination of low carbon content - Part 2: Infrared absorption method after combustion in an in an induction furnace

GB/T 34474 Determination of banded structure of steel

YB/T 6145 Hot-rolled eco pickled surface steel plate, sheet and strip

3 Terms and Definitions

For the purposes of this Document, the terms and definitions given in YB/T 6145 apply.

4 Classification, Codes and Notations for Designations

4.1 Classification and codes

4.1.1 It is classified into the following by the edge condition:

a) Cut edge, EC;

b) Mill edge, EM.

4.1.2 It is classified into the following by the thickness accuracy:

a) General thickness accuracy, PT.A;

b) High-grade thickness accuracy, PT.B.

4.1.3 It is classified into the following by surface treatment:

a) Rolled surface, SR;

b) Acid pickling surface, SA;

c) Eco pickled surface, EPS.

4.1.4 It is classified into the following by surface quality grade:

a) General surface, FA;

b) High-grade surface, FB.

4.2 Notations for designations

The steel designation is composed of the specified minimum tensile strength and the first letter “L” of the Chinese pinyin of “Lian” (“beam” in English).

EXAMPLE: 700L

700 - minimum tensile strength, in MPa.

L - the first letter of "Lian" (in Chinese pinyin) for the automobile beam.

5 Ordering Details

5.1 Contracts or orders placed in accordance with this Document shall include at least the following:

a) This Document number;

b) Product name;

c) Designation;

d) Surface treatment method and surface quality grade;

e) Delivery weight (or quantity);

f) Dimensions, shape, and permissible deviations;

g) Delivery condition;

h) Edge condition;

i) Thickness accuracy;

j) Special requirements (see 7.6).

5.2 If the surface treatment method is not specified in the order contract, the product shall be delivered with a rolled surface. For hot-rolled steel plates and strips delivered with a rolled surface, if the thickness accuracy is not specified, the product shall be delivered with a general thickness accuracy. If the edge condition is not specified, steel strips shall be delivered with mill edge; and steel plates shall be delivered with cut edge. For hot-rolled steel plates and strips delivered with acid pickling surface, if the thickness accuracy, edge condition, and surface quality grade are not specified, and whether oiling or not, they shall be delivered with high-grade thickness accuracy, cut edge, general surface quality grade, and oiling. For hot-rolled steel plates and strips with eco pickled surface, ordering requirements shall comply with the provisions of YB/T 6145.

6 Manufacturing Process

6.1 Smelting method

Steel is smelted in a converter or electric arc furnace. For steel plates and strips with a strength of 550L and above, vacuum degassing should be recommended.

6.2 Delivery condition

6.2.1 Steel plates and strips are delivered in hot-rolled or thermos-mechanically rolled condition.

Upon mutual agreement between the supplier and the purchaser, steel plates and strips may also be delivered in a heat-treated condition.

6.2.2 Surface treatment of steel plates and strips may be one of 3 methods: rolled surface, acid pickling surface, or eco pickled surface.

6.2.3 Steel plates and strips with acid-pickling surfaces shall generally be oiled. The oil film shall be removable with an alkaline solution. Under normal packaging, transportation, handling, and storage conditions, the supplier guarantees no rust shall occur within 3 months from the date of production completion. If the purchaser requires that steel plates and strips with acid pickling surfaces not be oiled, both parties shall specify this in the contract. Hot-rolled pickled steel sheets and strips without oil coating are prone to rust and scratches during transportation and processing; the supplier makes no guarantee regarding this.

6.2.4 The surface treatment methods for hot-rolled steel sheets and strips with eco pickled surfaces shall comply with the provisions of YB/T 6145. […]

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 17 pages — is available in the English PDF.

Referenced standards

Normative references

GB/T 223

Cited by

Editions of GB/T 3273

Edition	Title	Revision	Status
GB/T 3273-2026	Hot rolled steel sheet and strip for automobile frames	current edition	Current
GB/T 3273-2015	Hot rolled steel sheet and strip for automobile frames	previous edition	In force until 1 October 2026

This page sells the current edition, GB/T 3273-2026. Earlier editions are listed for reference only.

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