SAE J2745-2024 先进高强度汽车钢板的分类及性能

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entirely voluntary, and its applicability and suitability for any particular use, including any patent infringement arising therefrom, is the sole responsibility of the user.”

SAE reviews each technical report at least every five years at which time it may be revised, reaffirmed, stabilized, or cancelled. SAE invites your written comments and

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recording, or otherwise, without the prior written permission of SAE.

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SAE WEB ADDRESS: http://www.sae.org

For more information on this standard, visit

https://www.sae.org/standards/content/J2745_202402/

SURFACE VEHICLE

RECOMMENDED PRACTICE

J2745™

FEB2024

Issued 2007-07

Reaffirmed 2015-04

Stabilized 2024-02

Superseding J2745 APR2015

Categorization and Properties of Advanced High Strength Automotive Sheet Steels

RATIONALE

SAE J2745 covers advanced high strength automotive sheet steels that are now incorporated in SAE J2947.

STABILIZED NOTICE

This document has been declared “STABILIZED” by SAE Metals Technical Committee and will no longer be subjected to

periodic reviews for currency. Users are responsible for verifying references and continued suitability of technical

requirements. Newer technology may exist.

SAE INTERNATIONAL J2745™ FEB2024 Page 1 of 12

FOREWORD

The grades described in this specification are distinguished by their higher yield strengths, tensile strengths, and

formability than those of conventional low-carbon sheet steel, which are described in SAE J2329. Dual Phase and

Martensitic grades along with TRIP grades are being incorporated in this specification. Higher strength steels are

desirable for dent resistance, increased load bearing capability, better crash energy management, better intrusion control

performance, or part mass reduction through a decrease in sheet metal thickness.

An increase in strength generally leads to reduced ductility or formability. Care must be taken in designing parts, tooling,

and fabrication processes to obtain the greatest benefit from the higher strength sheet steels. Consultation in grade

selection between user and steel producer is recommended to insure compatibility of the strength, forming, and joining

characteristics.

Strength in these steels is achieved through chemical composition (alloying) and thermo-mechanical processing. Thermo-

mechanical processing includes mechanical rolling techniques, temperature control in hot rolling, and time/temperature

control in annealing of cold-reduced steel. Steel users should be aware that further thermal treatment may modify the as-

produced mechanical properties.

1. SCOPE

This SAE Recommended Practice defines various grades of continuously cast high-strength sheet steels and establishes

mechanical property ranges. These sheet steels can be formed, welded, assembled and painted in automotive

manufacturing processes. They can be specified as hot-rolled or cold-rolled sheet. Furthermore, they can be coated

(hot-dipped galvanized, hot-dipped galvannealed, and electrogalvanized) or uncoated. Not all combinations of strength,

dimensions and coatings may be commercially available; consult your steel supplier for details.

2. REFERENCES

2.1 Applicable Publications

The following publications form a part of this specification to the extent specified herein. Unless otherwise indicated, the

latest issue of SAE and ASTM publications shall apply.

SAE INTERNATIONAL J2745™ FEB2024 Page 2 of 12

2.1.1 SAE Publications

Available from SAE, 400 Commonwealth Drive, Warrendale, PA 15096-0001, Tel: 877-606-7323 (inside USA and

Canada) or 724-776-4970 (outside USA), www.sae.org.

SAE J1562 Selection of Zinc and Zinc-Alloy (Hot Dipped and Electrodeposited) Coated Steel Sheet

SAE J2329 Categorization and Properties of Low Carbon Automotive Sheet Steels

SAE J2340 Categorization and Properties of Dent Resistant, High Strength, and Ultra High Strength Automotive

Sheet Steel

2.1.2 ASTM Publications

Available from ASTM, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959, Tel: (610) 832-9585, www.astm.org.

ASTM A 370 Standard Test Methods and Definitions for Mechanical Testing of Steel Products

ASTM A 980 Standard Specification for Steel Sheet, Carbon, Ultra High Strength Cold Rolled

ASTM E 8/E 8M Standard Test Methods of Tension of Metallic Materials

ASTM E 517 Standard Test Method for Plastic Strain Ratio r for Sheet Metal

ASTM E 646 Standard Test Method for Tensile Strain-Hardening Exponents (n value) of Metallic Sheet

Materials

ASTM A 568/A 568M General Requirements Specification for Steel, Sheet, Carbon, Structural, and High-Strength,

Low-Alloy, Hot-Rolled and Cold-Rolled

ASTM A 635/A 635M Standard Specification for Steel, Sheet and Strip, Heavy-Thickness Coils, Hot-Rolled Carbon,

Structural, High Strength Low-Alloy with Improved Formability

ASTM A 924/A 924M General Requirements for Steel Sheet Metallic Coated by the Hot Dip Process

2.1.3 ISO Publications

Available from ANSI, 25 West 43rd Street, New York, NY 10036-8002, Tel: 212-642-4900, www.ansi.org.

ISO 377-1 Selection of preparation of samples and test pieces of wrought steel

ISO 6892 Metallic materials—Tensile testing at ambient temperature

ISO 7438 Metallic materials—Bend test

ISO 7500 Metallic materials—Verification of static uniaxial testing machines

ISO 9513 Metallic materials—Calibration of extensometers used in uniaxial testing

ISO 10113 Metallic materials—Sheet and strip—Determination of plastic strain ratio

ISO 10275 Metallic materials—Sheet and strip—Determination of tensile strain hardening exponent

ISO TS 16630 Hole expansion testing

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标签： #钢 #钢板 #高强度

摘要：

本文详细解读SAE J2745-2024标准，系统介绍了先进高强度汽车钢板的分类体系、力学性能指标与关键应用特性。该标准涵盖了从双相钢到马氏体钢等先进钢种的定义与技术要求，为汽车工程师在轻量化设计与碰撞安全性能优化中提供了权威的选材依据。通过解析其屈服强度、抗拉强度、延伸率及成形性等核心参数，帮助行业从业者快速掌握不同等级高强度钢板的性能差异与适用场景，助力提升整车制造质量与可靠性。

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