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ASTM A1088 - 13.pdf

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ASTM A1088 - 13.pdf

Designation A1088 − 13Standard Specification forSteel, Sheet, Cold-Rolled, Complex Phase CP, Dual PhaseDP and Transformation Induced Plasticity TRIP1This standard is issued under the fixed designation A1088; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon indicates an editorial change since the last revision or reapproval.1. Scope1.1 This specification covers cold-rolled, complex phaseCP grade, dual phase DP grade, and transformation inducedplasticity TRIP grade steel sheet in coils and cut lengths.1.2 Product furnished under this specification shall conformto the applicable requirements of the latest issue of Specifica-tion A568/A568M, unless otherwise provided herein.1.3 The product is available in a number of designations andgrades with mandatory chemical requirements and mandatorymechanical properties that are achieved through thermal orthermal-mechanical treatments, and are designed to be com-patible with automotive application requirements.1.4 The grade designation nomenclature of the productdiffers from other cold-rolled sheet products having mandatorymechanical properties in that ordering is to tensile, rather thanyield strength values.1.5 The text of this specification references notes andfootnotes that provide explanatory material. These notes andfootnotes, excluding those in tables and figures, shall not beconsidered as requirements of this specification.1.6 The values stated in SI units are to be regarded asstandard. No other units of measurement are included in thisstandard.1.7 This standard does not purport to address all of thesafety concerns, if any, associated with its use. It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use. Some specifichazards statements are given in Section 7 on Hazards.2. Referenced Documents2.1 ASTM Standards2A370 Test Methods and Definitions for Mechanical Testingof Steel ProductsA568/A568M Specification for Steel, Sheet, Carbon,Structural, and High-Strength, Low-Alloy, Hot-Rolled andCold-Rolled, General Requirements forA941 Terminology Relating to Steel, Stainless Steel, RelatedAlloys, and FerroalloysE646 Test Method for Tensile Strain-Hardening Exponentsn -Values of Metallic Sheet Materials3. Terminology3.1 DefinitionsSee Terminology A941 for definitions ofgeneral terminology relating to cold-rolled steel sheet products.3.2 Definitions3.2.1 complex phase CP steel, nsteel sheet with aferritic/bainitic matrix containing small amounts of retainedaustenite or pearlite, or both where significant grain refinementis caused by retarded crystallization or precipitation of microal-loying elements.3.2.2 dual phase DP steel, nsteel sheet with a ferriticmatrix containing a martensitic phase present in the form ofislands.3.2.3 transformation induced plasticity TRIP steel,nsteel sheet with a mainly ferritic matrix containing retainedaustenite where, during the forming process, retained austenitecan transform to martensite.4. Classification4.1 The material is available in several designations andgrades as follows4.1.1 Complex phase CP steel Grades 600T/350Y, 780T/500Y, and 980T/700Y,4.1.2 Dual phase DP steel Grades 440T/250Y, 490T/290Y, 590T/340Y, 780T/420Y, and 980T/550Y, and1This specification is under the jurisdiction of ASTM Committee A01 on Steel,Stainless Steel and Related Alloys and is the direct responsibility of SubcommitteeA01.19 on Steel Sheet and Strip.Current edition approved Nov. 1, 2013. Published November 2013. DOI10.1520/A1088-132For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standard’s Document Summary page onthe ASTM website.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States1Copyright by ASTM Intl all rights reserved;4.1.3 Transformation induced plasticity TRIP steelGrades 690T/410Y and 780T/440Y.4.2 Cold-rolled steel sheet is supplied for either exposed orunexposed applications. Within the latter category, cold-rolledsheet is specified either “temper rolled” or “annealed last.” Fordetails on processing, attributes and limitations, and inspectionstandards, refer to Specification A568/A568M.5. Ordering Information5.1 It is the purchaser’s responsibility to specify in thepurchase order all ordering information necessary to describethe required material. Examples of such information include,but are not limited to, the following5.1.1 ASTM specification number and year of issue;5.1.2 Name of product steel sheet, cold-rolled;5.1.3 Designation of sheet [CP Grades 600T/350Y, 780T/500Y, or 980T/700Y, DP Grades 440T/250Y, 490T/290Y,590T/340Y, 780T/420Y, or 980T/550Y, or TRIP Grades690T/410Y or 780T/440Y];5.1.4 Finish see 8.1;5.1.5 Oiled or not oiled see 8.2;5.1.6 Dimensions show thickness, minimum or nominal,width, flatness requirements, and length, if cut lengths;NOTE 1Not all producers are capable of meeting all the limitations ofthe thickness tolerance tables in Specification A568/A568M. The pur-chaser should contact the producer regarding possible limitations prior toplacing an order.5.1.7 Coil size requirements specify maximum outsidediameter OD, acceptable inside diameter ID, and maximummass;5.1.8 Quantity;5.1.9 Packaging;5.1.10 Certification, if required, heat analysis and mechani-cal property report;5.1.11 Application part identification and description; and5.1.12 Special requirements if any.NOTE 2Typical ordering descriptions are as follows steel sheet,cold-rolled, DP Grade 590T/340Y,ASTMA1088, oiled, minimum 1.00 by1200 mm by coil, 1520 mm maximum OD, 600 mm ID, 10 000 kgmaximum, for side reinforcement strut.6. Chemical Composition6.1 The heat analysis of the steel shall conform to therequirements shown in Table 1.6.2 Each of the elements listed in Table 1 shall be includedin the report of heat analysis, including each element incolumns with grouped elements. When the amount of copper,nickel, chromium, or molybdenum is less than 0.02 , reportthe analysis as either 0.02 or the actual determined value.When the amount of vanadium, titanium, or niobium is lessthan 0.008 , report the analysis as either 0.008 or theactual determined value.NOTE 3Niobium is also known as Columbium.6.2.1 See Specification A568/A568M for chemical analy-sis procedures and product analysis tolerances.7. Mechanical Properties7.1 All designations and grades shall conform to themechanical property requirements in Table 2.7.1.1 All designations and grades shall conform to bakehardening index requirements included in Table 2. The mini-mum increase in yield strength is based on the lower yieldstress, after a prestrained specimen has been exposed to astandard bake cycle of 170C for 20 min. The method formeasuring the bake hardening index is described in the AnnexA1.7.2 Mechanical property tests shall be conducted in accor-dance with the methods specified in Specification A568/A568M, or those prescribed by the purchaser.7.3 Bending Properties Minimum Cold Bending RadiiHigh-strength sheet steels are commonly fabricated by coldbending. There are many interrelated factors that affect theability of a steel to cold form over a given radius under shopconditions. These factors include thickness, strength level,degree of restraint, relationship to rolling direction, chemistry,TABLE 1 Chemical RequirementsASteel Sheet Designations, CP, DP, and TRIPComposition, Heat Analysis Element, max unless otherwise shownDesignation/Grade C MnAlSiCPSCuBNi CrMoCVNbDTiCNCP600T/350Y 0.18 5.30 0.080 0.015 0.20 0.50 1.00 0.35 ...780T/500Y 0.18 5.50 0.080 0.015 0.20 0.50 1.00 0.35 ...980T/700Y 0.25 5.20 0.080 0.015 0.20 0.50 1.00 0.35 ...DP450T/250Y 0.15 3.00 0.080 0.015 0.20 0.50 1.00 0.35 ...490T/290Y 0.15 3.40 0.080 0.015 0.20 0.50 1.00 0.35 ...590T/340Y 0.17 4.75 0.080 0.015 0.20 0.50 1.40 0.35 ...780T/420Y 0.18 5.40 0.080 0.015 0.20 0.50 1.40 0.35 ...980T/550Y 0.23 6.00 0.080 0.015 0.20 0.50 1.40 0.35 ...TRIP690T/410Y 0.32 6.20 0.12 0.015 0.20 0.50 0.60 0.40 ...780T/440Y 0.32 6.70 0.12 0.015 0.20 0.50 0.60 0.40 ...AWhere an ellipsis ... appears in the table, there is no requirement but, the analysis shall be reported.BWhen copper is specified, the copper limit is a minimum requirement. When copper steel is not specified, the copper limit is a maximum requirement.CThe producer shall report the individual composition of each element in the grouping.DNiobium Nb is also known as Columbium Cb.A1088 − 132Copyright by ASTM Intl all rights reserved;and base metal microstructure. The table in Appendix X1 liststhe suggested minimum inside radius for 90 cold bending forthe grades of steel in this specification. They presuppose “hardway” bending bend axis parallel to rolling direction andreasonably good shop forming practices. Where possible, theuse of larger radii or “easy way” bends is recommended forimproved performance.8. Finish and Appearance8.1 Surface Finish8.1.1 Unless otherwise specified, the sheet shall have amatte finish. When required, specify the appropriate surfacetexture and condition. For additional information, see theFinish and Condition section of Specification A568/A568M.8.2 Oiling8.2.1 Unless otherwise specified, the sheet shall be oiled.8.2.2 When required, specify the sheet to be furnished notoiled dry.9. Retests and Disposition of Non-Conforming Material9.1 Retests, conducted in accordance with the requirementsof the section on Retests and Disposition of Non-ConformingMaterial of Specification A568/A568M, are permitted when anunsatisfactory test result is suspected to be the consequence ofthe test method procedure.9.2 Disposition of non-conforming material shall be subjectto the requirements of Specification A568/A568M.10. Dimensions and Permissible Variations10.1 All dimensions and permissible variations shall com-ply with the requirements of Specification A568/A568M.11. Keywords11.1 cold-rolled sheet; complex phase steel; dual phasesteel; steel; steel sheet; transformation induced plasticity steelANNEXMandatory InformationA1. BAKE HARDENABLE INDEXA1.1 Determination of Bake Hardening IndexA1.1.1 The bake hardening index BHI is determined by atwo-step procedure using a standard longitudinal rollingdirection tensile-test specimen, prepared in accordance withTest Methods A370. The test specimen is first strained intension. The magnitude of this tensile “pre-strain” shall be 2 extension under load. The test specimen is then removedfrom the test machine and baked at a temperature of 170C fora period of 20 minutes. Referring to Fig. A1.1, the bakehardening BHI of the material is calculated as followsBHI 5 B 2 A A1.1whereA flow stress at 2 extension under load.B yield strength upper yield strength BU or lower yieldstrength BL after baking at 170C for 20 min.A1.1.2 The original test specimen cross section width andthickness is used in the calculation of all engineering strengthsin this test.A1.1.3 The pre-straining of 2 in tension is intended tosimulate a modest degree of forming strain, while the subse-quent baking is intended to simulate a paint-curing or similartreatment. In the production of actual parts, forming strains andbaking treatments can differ from those employed here and, asa result; final properties can differ from the values obtainedunder these controlled conditions.TABLE 2 Mechanical Property Requirements Longitudinal, Cold Rolled Steel Sheet Designations CP, DP, and TRIPADesignation Grade Yield Strength,min, MPaTensile Strength,min, MPaElongation in 50mm, min, n ValueBBake HardeningIndex, min, MPaLower YieldCP 600T/350Y 350 600 16 ... 30780T/500Y 500 780 10 ... 30980T/700Y 700 980 7 ... 30DP 450T/250Y 250 450 27 0.16 30490T/290Y 290 490 25 0.15 30590T/340Y 340 590 21 0.14 30780T/420Y 420 780 14 0.10 30980T/550Y 550 980 8 ... 30TRIP 690T/410Y 410 690 21 0.19 30780T/440Y 440 780 19 0.16 30AWhere an ellipsis . . . appears in this table, there is no requirement.Bn ValueStrain-hardening exponent as determined by Test Method E646, 10-20 strain.A1088 − 133Copyright by ASTM Intl all rights reserved;APPENDIXNonmandatory InformationX1. BENDING PROPERTIESX1.1 Table X1.1 lists suggested minimum inside radii forcold bending.FIG. A1.1 Representation of bake Hardening IndexA1088 − 134Copyright by ASTM Intl all rights reserved;ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the riskof infringement of such rights, are entirely their own responsibility.This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years andif not revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for additional standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 phone, 610-832-9555 fax, or serviceastm.org e-mail; or through the ASTM websitewww.astm.org. Permission rights to photocopy the standard may also be secured from the Copyright Clearance Center, 222Rosewood Drive, Danvers, MA 01923, Tel 978 646-2600; http//www.copyright.com/TABLE X1.1 Suggested Minimum Inside Radii for Cold BendingANOTE 1t equals a radius equivalent to the steel thickness.NOTE 2The suggested radii should be used as minimums for 90bends in actual shop practice.Designation Grade Minimum InsideRadius for ColdBendingBCP 600T/350Y 2t780T/500Y 3t980T/700Y 4tDP 450T/700Y 11⁄2t490T/290Y 2t590T/340Y 2t780T/420Y 21⁄2t980T/550Y 3tTRIP 690/410Y 21⁄2t780T/440Y 21⁄2tAMaterial that does not perform satisfactorily, when fabricated in accordancewith the requirements in this table may be subject to rejection pending negotiationwith the steel supplier.BBending capability may be limited by coating designation.A1088 − 135Copyright by ASTM Intl all rights reserved;

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