1、 SURFACE VEHICLE RECOMMENDED PRACTICE J2392 APR2015 Issued 2003-03 Reaffirmed 2015-04 Superseding J2392 SEP2009 Categorization and Properties of SAE Cold Rolled Strip Steels RATIONALE J2392 has been reaffirmed to comply with the SAE five-year review policy. _ SAE Technical Standards Board Rules prov
2、ide 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 us
3、er.” 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 suggestions. Copyright 2015 SAE International All rights reserved. No part of this publication may be reproduced, stored in a
4、retrieval system or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without the prior written permission of SAE. TO PLACE A DOCUMENT ORDER: Tel: 877-606-7323 (inside USA and Canada) Tel: +1 724-776-4970 (outside USA) Fax: 724-776-0790 Email: C
5、ustomerServicesae.org SAE WEB ADDRESS: http:/www.sae.org SAE values your input. To provide feedback on this Technical Report, please visit http:/www.sae.org/technical/standards/J2392_201504 1. SCOPE This SAE recommended practice defines and establishes tolerances and attributes of cold rolled strip
6、steels. Differences between cold rolled strip and cold rolled sheet products are discussed so that process designers can make informed material selection decisions. 1.1 Purpose Cold rolled strip steels are produced to closer dimensional tolerances than cold rolled sheet steels. Cold rolled strip is
7、commercially available over a wider range of thickness and chemical compositions. Cold rolled strip is also available with finishes, tempers and edges that differ from sheet products. Cold rolled strip steels are produced in sizes as follows in Table 1: TABLE 1 - DIMENSIONAL LIMITS FOR COLD ROLLED S
8、TRIP STEELS Width, mm Thickness, mm 12.5 to 600 mm 7.6 mm and under Strip tolerance products are available in widths greater than 600 mm, however, these products are technically classified as sheet. 2. REFERENCES 2.1 Applicable Publications The following publications form a part of this specificatio
9、n to the extent specified herein. Unless otherwise specified, the latest issue of SAE and ASTM publications shall apply. 2.1.1 SAE Publications Available from SAE International, 400 Commonwealth Drive, Warrendale, PA 15096-0001, Tel: 877-606-7323 (inside USA and Canada) or 724-776-4970 (outside USA)
10、, www.sae.org. SAE J403 Chemical Compositions of SAE Carbon Steels SAE J404 Chemical Compositions of SAE Alloy Steels SAE J409 Product AnalysisPermissible Variations from Specified Chemical Analysis of a Heat or Cast of Steel SAE J911 Surface Roughness and Peak Count Measurement of Cold-Rolled Sheet
11、 Steel SAE J2329 Categorization and Properties of Low-Carbon Automotive Sheet Steels 2.1.2 ASTM Publications Available from ASTM International, 100 Barr Harbor Drive, P.O. Box C700, West Conshohocken, PA 19428-2959, Tel: 610-832-9585, www.astm.org. ASTM A 109/A 109M Standard Specification for Steel,
12、 Strip, Carbon, Cold Rolled ASTM E 430 Method for Measurement of Gloss of High Gloss Surfaces By Goniophotometry 2.2 Related Publications The following publications are provided for information purposes only and are not a required part of this specification. 2.2.1 SAE Publications Available from SAE
13、 International, 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 J1058 Standard Sheet Steel Thickness SAE J1268 Hardenability Bands for Carbon and Alloy H Steels SAE J2340 Categorization and Properties of Den
14、t Resistant, High Strength, and Ultra High Strength Automotive Sheet Steel 2.2.2 ASTM Publications Available from ASTM International, 100 Barr Harbor Drive, P.O. Box C700, West Conshohocken, PA 19428-2959, Tel: 610-832-9585, www.astm.org. ASTM A 684/A 684M Standard Specification for Steel, Strip, Hi
15、gh - Carbon, Cold Rolled 2.2.3 AIST Publications Available from Association for Iron Carbon, High Strength Low Alloy, and Alloy; Iron and Steel Society Publication, February, 1995 _ SAE INTERNATIONAL J2392 Reaffirmed APR2015 2 of 103. TEMPER DESIGNATION 3.1 Low carbon cold rolled strip is often spec
16、ified to standard tempers. Temper refers to the hardness, or strength of the steel. As hardness increases, formability decreases. In general, the degree of formability increases as the temper number increases, as indicated in Table 2. TABLE 2 - TEMPER DESIGNATORS: LOW CARBON COLD ROLLED STRIP STEELS
17、 Temper Number Temper Name Thickness Under ThicknessThrough HardnessMinimumHardnessMaximumApprox. TensileStrength (MPa)Description 1 Hard 0.6 1.0 1.8 7.6 0.6 1.0 1.8 15T90 30T76 B90 B84 620 70 Very hard and springy intended for flat work not requiring cold forming. 2 Half Hard 0.6 1.0 7.6 0.6 1.0 15
18、T83.5 30T63.5 B70 15T88.5 30T73.5 B85 450 70 Moderately hard and springy intended for limited bending defined as 90 degrees across the rolling direction around a radius equal to the thickness. 3 Quarter Hard 0.6 1.0 7.6 0.6 1.0 15T80 30T56 B60 15T85 30T67 B75 380 70 Medium soft intended for limited
19、amounts of bending, forming and drawing. May be bent 180 degrees across the rolling direction around a radius equal to the thickness. 4 Skin Rolled 0.6 1.0 7.6 0.6 1.0 15T82 30T60 B65 330 40 Soft and ductile intended for deep drawing. May be bent flat upon itself in any direction. 5 Dead Soft 0.6 1.
20、0 7.6 0.6 1.0 15T78.5 30T53 B55 300 40 Soft and ductile intended for deep drawing applications where stretcher straining and fluting is not objectionable. 3.2 Low carbon cold rolled strip is available in tempers other than standard by agreement between strip user and strip producer. 4. CHEMICAL COMP
21、OSITION 4.1 Cold rolled strip steels are produced from a wide range of hot band alloys. In general, cold rolled strip steel products may be produced from any grade of steel that is available for hot band substrate. With the exception of strip produced to standard tempers (hardness), other public spe
22、cifications govern the applicable composition limits. 4.2 Low Carbon Steel Specified To Temper When cold rolled strip is specified to a standard temper, chemical composition limits are given by Table 3. TABLE 3 - HEAT ANALYSIS COMPOSITION - WT % Element Temper 1, 2, 3 Number 4, 5 Carbon, max. 0.25 0
23、.15 Manganese, max. 0.60 0.60 Phosphorus, max. 0.025 0.025 Sulfur, max. 0.025 0.025 _ SAE INTERNATIONAL J2392 Reaffirmed APR2015 3 of 104.3 Carbon cold rolled strip steels are available in chemical compositions defined by SAE J403. 4.4 Alloy cold rolled strip steels are available in chemical composi
24、tions defined by SAE J404. 4.5 Cold rolled high strength low alloy strip steels are produced to chemical compositions defined by SAE J2340. 4.6 Fully stabilized cold rolled strip steels are available with chemical limits defined by SAE J2329, Grade 5. 4.7 Special chemical compositions and restricted
25、 versions of standard SAE grades are available subject to hot band substrate availability. Chemical analysis limits for these grades are defined by agreement between strip user and strip producer. 4.8 Permissible product analysis variations from specified ladle chemical analysis are defined in SAE J
26、409. 5. THICKNESS TOLERANCES 5.1 Across the full range of nominal thickness, cold roll strip thickness tolerances range from 58% to 83% of the corresponding thickness tolerances for cold rolled sheet steels. 5.2 Standard cold rolled strip tolerances for carbon, alloy, high strength low alloy, fully
27、stabilized and special alloy steels appear in Table 4. 5.3 Non standard tolerances, either wider or closer, may be specified subject to strip producer capabilities. Such tolerances are by agreement between strip user and strip producer. TABLE 4 - THICKNESS TOLERANCES OF COLD ROLLED STRIP STEELS(1)No
28、minal Thickness (mm) Width (mm) 12.5 to less than 300 Width (mm) 300 to less than 450 Width (mm) 450 to 600 6.40 - 7.60 0.080 0.090 0.100 4.00 - 6.39 0.065 0.080 0.090 3.20 - 3.99 0.055 0.070 0.080 1.80 - 3.19 0.045 0.055 0.070 1.00 - 1.79 0.035 0.045 0.060 0.75 - 0.99 0.030 0.040 0.050 0.50 - 0.74
29、0.025 0.035 0.040 0.38 - 0.49 0.020 0.025 0.030 0.25 - 0.37 0.013 0.020 0.025 0.25 0.007 0.015 0.020 1. Measured 10 mm or more in from edge; and on narrower than 25 mm, at any place between edges. (plus and minus, mm) 6. EDGES AND WIDTH TOLERANCES 6.1 Cold rolled strip may be specified with many dif
30、ferent types of edge conditions produced by rolling, slitting or other mechanical means. 6.2 No. 1 Edge is a prepared edge of a specified contour (round or square), which is produced when a very accurate width is required, or when an edge condition suitable for electroplating is required, or both. 6
31、.3 No. 2 Edge is a natural mill edge carried through the cold rolling from the hot rolled strip without additional processing of the edge. 6.4 No. 3 Edge is an approximately square edge produced by slitting on which the burr is not eliminated. This edge is most frequently specified for cold rolled s
32、trip steels. _ SAE INTERNATIONAL J2392 Reaffirmed APR2015 4 of 106.5 No. 4 Edge is a rounded edge produced by edge rolling either the natural edge of hot rolled strip or slit strip edge. This edge is produced when the width tolerance and edge condition are not as exacting as for No. 1 edge. 6.6 No.
33、5 Edge is an approximately square edge produced from slit edge material on which the burr is eliminated usually by rolling or filing. 6.7 No. 6 Edge is a square edge produced by edge rolling the natural edge of hot rolled strip or slit edge strip. This edge is produced when the width tolerance and e
34、dge condition are not as exacting as for No. 1 edge. 6.8 Skived edges are custom shaped edges produced by mechanical edge shaving with special tools. 6.9 Some edges are not available over the entire range of cold rolled strip thickness and width. 6.10 Width tolerances for different edges are defined
35、 in ASTM A109/A109M. 7. FINISH 7.1 Cold rolled strip steels are usually specified to one of the following finishes. 7.1.1 Number 1 or Matte (Dull) Finish is a finish without luster produced by rolling on rolls roughened by mechanical or other means. This finish is especially suitable for paint adhes
36、ion and may aid drawing by reducing contact friction between die and steel. 7.1.2 Number 2 or Regular Bright Finish is produced by rolling on moderately smooth rolls. 7.1.3 Number 2-1/2 or Better Bright finish is a smooth finish suitable for those plating applications where high luster is not requir
37、ed. 7.1.4 Number 3 or Best Bright finish is generally of high luster produced by special rolling practices, including the use of specially prepared rolls. It is the highest quality finish commonly produced and is particularly suited for bright plating. The production of this finish requires extreme
38、care in processing and extensive inspection. Paper interleaving is frequently used for protection. In addition to the surface roughness values in Table 5, the user and producer may agree on goniophotometric measurement values (Rs/DI) as defined in ASTM E 430. TABLE 5 - TYPICAL SURFACE ROUGHNESS MEAS
39、UREMENT RANGES Surface Microinches Maximum Number 1 or Matte (Dull) 80 Ra Number 2 or Regular Bright 20 Ra Number 2-1/2 or Better Bright 10 Ra Number 3 or Best Bright 4 Ra 1. Due to vagaries in measuring surface roughness, as well as the inherent variability in such rolled surfaces, these values are
40、 only typical, and values outside these ranges would not be considered unexpected. 2. Measured either parallel with or across the rolling direction. 3. Tested in accordance with SAE J911.8. HIGH CARBON AND ALLOY COLD ROLLED STRIP STEELS 8.1 High carbon steels are those whose maximum specified carbon
41、 contents exceed 0.25 weight percent. 8.2 High carbon and alloy cold rolled strip steels are supplied as either untempered or as Hardened and Tempered. Untempered products are supplied as-produced; the end user will often heat treat the part after forming. Hardened and tempered strip is given a quen
42、ch and temper heat treatment prior to shipment; the end user does not need to heat treat to achieve maximum strength. _ SAE INTERNATIONAL J2392 Reaffirmed APR2015 5 of 108.3 Untempered high carbon and alloy cold rolled strip steels are supplied in four product types. 8.3.1 Spheroidized Annealed is i
43、ntended for applications requiring maximum formability. It is normally produced to give the lowest maximum hardness for each carbon range. The microstructure of this type consists of spheroidal carbides in a matrix which is essentially free of pearlite. 8.3.2 Annealed is intended for applications re
44、quiring moderate cold forming. It is produced to a maximum hardness. The microstructure is mostly a spheroidal structure, but may contain some vestiges of pearlite. 8.3.3 Table 6 shows approximate relationships between steel grade and hardness for spheroidized annealed and annealed high carbon steel
45、s. Hardness limits for alloy steels are usually higher than the corresponding high carbon steel and are usually established by agreement between strip user and strip producer. TABLE 6 - APPROXIMATE RELATIONSHIP BETWEEN STEEL GRADE, ANNEALING TREATMENT AND HARDNESS FOR COLD ROLLED STRIP STEEL Grade H
46、R15T HR30T HRB Annealed Steel 1035 86 68 78 1045 87 70 80 1050 87 71 82 1055/1060 88 72 84 1065 89 73 85 1070 89 74 86 1074 89 74 87 1080 89 75 88 1095 90 77 91 Spheriodized Annealed Steel 1035 85 66 75 1045 86 68 77 1050 86 69 79 1055/1060 87 70 71 1065 87 71 72 1070 88 72 83 1074 88 72 84 1080 89
47、74 86 1095 89 75 88 8.3.4 Full Hard high carbon and alloy strip steels are hard and springy steels intended for flat applications not requiring cold forming. Full hard is cold rolled, with or without preparatory treatment, to minimum hardness requirements. The prior treatment and amount of cold redu
48、ction are varied to produce hardness requirements as established by consumer and producer. 8.4 Hardened and Tempered Cold Rolled High Carbon and Alloy Strip 8.4.1 Hardened and tempered cold rolled high carbon steel strip is produced by continuously heat treating the metal resulting in very high strength and hardness.
