sae_j2340-1999_高强度和超高强度汽车钢板.pdf

SAE Technical Standards Board Rules provide that: “This report is published by SAE to advance the state of technical and engineering sciences. The use of this report is 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 reaffirmed, revised, or cancelled. SAE invites your ments and suggestions. TO PLACE A DOCUMENT ORDER: (724) 776-4970 FAX: (724) 776-0790 SAE WEB ADDRESS yright 1999 Society of Automotive Engineers, Inc. All rights reserved. Printed in . SURFACE VEHICLE monwealth Drive, Warrendale, PA 15096-MENDED PRACTICE Submitted for recognition as an American National Standard J2340 ISSUED OCT1999 Issued 1999-10 Categorization and Properties of Dent Resistant, High Strength, and Ultra High Strength Automotive Sheet Steel Foreword—The primary reason higher strength steels are used is because their yield and tensile strengths are higher than those of low-carbon sheet steel, which are described in SAE J2329. Higher strength steels are desirable for dent resistance, increased load bearing capability, better crash energy management, or for 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 mended to patibility of the strength and forming characteristics. Strength in these steels is achieved through position (alloying) and special processing. Special processing includes mechanical rolling techniques, temperature control in hot rolling, and time/temperature control in annealing of cold-reduced steel. Further or additional thermal treatment may modify the origi