SAE J1442-1993 HIGH-STRENGTH, HOT-ROLLED STEEL PLATES, BARS, AND SHAPES.pdf
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1、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 therefr
2、om, 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 written comments and suggestions. QUESTIONS REGARDING THIS DOCUMENT: (412) 772-8512 FAX: (412) 776-0243 TO PLACE A DOCU
3、MENT ORDER; (412) 776-4970 FAX: (412) 776-0790 Copyright 1993 Society of Automotive Engineers, Inc. All rights reserved.Printed in U.S.A. SURFACE VEHICLE 400 Commonwealth Drive, Warrendale, PA 15096-0001 RECOMMENDED PRACTICE Submitted for recognition as an American National Standard J1442 REV. NOV93
4、 Issued1984-06 Revised1993-11 Superseding J1442 DEC88 (R) HIGH-STRENGTH, HOT-ROLLED STEEL PLATES, BARS, AND SHAPES ForewordThis Document has not changed other than to put it into the new SAE Technical Standards board Format. 1.ScopeThis SAE Recommended Practice covers six levels of high strength car
5、bon and high-strength low- alloy steel plates, bars, and shapes for structural use. The six strength levels are 290, 345, 415, 450, 485, and 550 MPa or 42, 50, 60, 65, 70, and 80 ksi minimum yield point. Different chemical compositions are used to achieve the specified mechanical properties. In some
6、 cases there are significant differences in chemical composition for the same strength level, depending on the fabricating requirements. Because the chemical compositions may vary significantly among the producers, despite the required mechanical properties being the same, it is important that the f
7、abricator consult with the producer to determine the relative effects of the producers composition on the forming, welding, and field service requirements. The products within the scope of this document include the following: a.PlatesFlat hot-rolled steel (cut length only) greater than 200 mm (8 in)
8、 wide and greater than 5.8 mm (0.230 in) thick, and greater than 1220 mm (48 in) wide and greater than 4.6 mm (0.179 in) thick. For sheet and strip products (less than 5.8 mm (0.230 in) thickness), refer to SAE J1392. b.BarsRounds, squares, and hexagons of all sizes (cut length only, flats 5.2 mm (0
9、.203 in) and greater in thickness but not greater than 150 mm (6 in) wide, and flats greater than 5.8 mm (0.229 in) thick and over 150 mm (6 in) to 204 mm (8 in) wide. c.Structural ShapesHot-rolled flanged sections having at least one dimension of the cross section 75 mm (3 in) or greater. (Size gro
10、upings for tensile property classification are listed in ASTM A 6/A 6M Table A.) d.Bar Size ShapesHot-rolled flanged sections having a maximum dimension of the cross section less than 75 mm (3 in). 1.1IntroductionHigh-strength steel discussed in this SAE Recommended Practice involves hot-rolled plat
11、es, bars, structural shapes, and bar size shapes. The strength is achieved through chemical composition and rolling pratice; it is not achieved through quenching and tempering or additional rolling operations. SAE J1442 Revised NOV93 -2- 2.References 2.1Applicable PublicationsThe following publicati
12、ons form a part of the specification to the extent specified herein. 2.1.1ASTM PUBLICATIONSAvailable from ASTM, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959. ASTM A 6/A 6MGeneral Requirements for Rolled Steel Plates, Shapes, Sheet Piling, and Bars of Structural Use ASTM A 370Standard Meth
13、ods and Definitions for Mechanical Testing of Steel Products ASTM A 572/A 572MSpecification for High-Strength Low-Alloy Columbium-Vanadium Steels of Structural Quality ASTM A 588/A 588MSpecification for High-Strength Low-Alloy Structural Steel with 50 ksi (345 MPa) Minimum Yield Point to 4 in thick
14、ASTM A 656/A 656MSpecification for Hot-Rolled Structural Steel, High-Strength Low-Alloy Plate with Improved Formability ASTM G 101Guide for Estimating the Atmospheric Corrosion Resistance of Low Alloy Steels 3.General InformationThe specific grades are identified by the minimum yield point expressed
15、 in MPa, that is 290, 345, 415, 450, 485, and 550 or in ksi, that is 42, 50, 60, 65, 70, and 80 ksi. They are further identified at some strength levels with the suffixes A, W, and F. Chemical composition and processing variables are the bases for the suffix differences. The A suffix generally ident
16、ifies the relatively higher carbon compositions compared to the W and F suffix grades. Also, the A suffix grades specify a difference between the minimum yield point and the minimum tensile strength of at least 105 MPa or 15 ksi. Grades 290A, 345A, 415A, and 450A are similar to grades contained in A
17、STM A 572/A 572M. The W suffix identifies a grade with improved atmospheric corrosion resistance. The corrosion resistance of this steel in most environments is substantially better than that of carbon structural steels with or without copper addition. When properly exposed to the atmosphere, this s
18、teel can be used bare (unpainted) for many applications. For methods of estimating the atmospheric corrosion resistance of low-alloy steels, see ASTM G 101. The F suffix grades are the most formable grades in this practice. They are characterized by lower carbon content than the A and W suffix grade
19、s, and are normally made to killed steel fine grain and sulfide inclusion control practices. Due to the lower carbon content, the difference between the yield point and tensile strength is generally less than the difference in the A and W suffix grades. The F suffix grades, which normally are availa
20、ble only in Plates and Bar Size Flats, specify a difference between minimum yield point and minimum tensile strength of at least 70 MPa or 10 ksi although some producers use a chemical composition that provides differences of approximately 105 MPa or 15 ksi. It is important to note that these grades
21、 possess superior formability at their respective strength levels. The relatively smaller difference between the yield point and tensile strength does not lessen this high degree of formability. Grades 345F, 415F, 485F, and 550F are similar to grades contained in ASTM A 656/A 656M. When killed steel
22、 is required, the suffix K should follow the grade designation, 290AK (42AK), or 345AK (50AK), or 415AK (60AK). SAE J1442 Revised NOV93 -3- Because these steels are characterized by their special mechanical properties obtained in the as-rolled conditions, they are not intended for any heat treatment
23、 by the purchaser either before, during, or after fabrication. The fabricator should not subject these steels to such heat treatments without assuming responsibility for the resulting mechanical properties. For certain applications, these steels may be annealed, normalized, or stress relieved with s
24、ome effect on the mechanical properties; it is recommended that prior to such heat treatments, the purchaser should consult the producer to determine the need for and the effect on mechanical properties. All grades and chemical compositions discussed in the practice are weldable despite the differen
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