ASTM A1088-13(2019)

This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: A1088 −13 (Reapproved 2019)
Standard Specification for
Steel, Sheet, Cold-Rolled, Complex Phase (CP), Dual Phase
(DP) and Transformation Induced Plasticity (TRIP)
This standard is issued under the fixed designation A1088; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope 2. Referenced Documents
1.1 This specification covers cold-rolled, complex phase 2.1 ASTM Standards:
(CP) grade, dual phase (DP) grade, and transformation induced A370 Test Methods and Definitions for Mechanical Testing
plasticity (TRIP) grade steel sheet in coils and cut lengths. of Steel Products
A568/A568M Specification for Steel, Sheet, Carbon,
1.2 Product furnished under this specification shall conform
Structural,andHigh-Strength,Low-Alloy,Hot-Rolledand
to the applicable requirements of the latest issue of Specifica-
Cold-Rolled, General Requirements for
tion A568/A568M, unless otherwise provided herein.
A941 TerminologyRelatingtoSteel,StainlessSteel,Related
1.3 Theproductisavailableinanumberofdesignationsand
Alloys, and Ferroalloys
grades with mandatory chemical requirements and mandatory
E646 Test Method for Tensile Strain-Hardening Exponents
mechanical properties that are achieved through thermal or
(n -Values) of Metallic Sheet Materials
thermal-mechanical treatments, and are designed to be com-
patible with automotive application requirements.
3. Terminology
1.4 The grade designation nomenclature of the product
3.1 Definitions—See Terminology A941 for definitions of
differs from other cold-rolled sheet products having mandatory
generalterminologyrelatingtocold-rolledsteelsheetproducts.
mechanical properties in that ordering is to tensile, rather than
3.2 Definitions:
yield strength values.
3.2.1 complex phase (CP) steel, n—steel sheet with a
1.5 The text of this specification references notes and
ferritic/bainitic matrix containing small amounts of retained
footnotes that provide explanatory material. These notes and
austenite or pearlite, or both where significant grain refinement
footnotes, excluding those in tables and figures, shall not be
iscausedbyretardedcrystallizationorprecipitationofmicroal-
considered as requirements of this specification.
loying elements.
1.6 The values stated in SI units are to be regarded as
3.2.2 dual phase (DP) steel, n—steel sheet with a ferritic
standard. No other units of measurement are included in this
matrix containing a martensitic phase present in the form of
standard.
islands.
1.7 This standard does not purport to address all of the
3.2.3 transformation induced plasticity (TRIP) steel,
safety concerns, if any, associated with its use. It is the
n—steel sheet with a mainly ferritic matrix containing retained
responsibility of the user of this standard to establish appro-
austenite where, during the forming process, retained austenite
priate safety, health, and environmental practices and deter-
can transform to martensite.
mine the applicability of regulatory limitations prior to use.
1.8 This international standard was developed in accor- 4. Classification
dance with internationally recognized principles on standard-
4.1 The material is available in several designations and
ization established in the Decision on Principles for the
grades as follows:
Development of International Standards, Guides and Recom-
4.1.1 Complex phase (CP) steel (Grades 600T/350Y, 780T/
mendations issued by the World Trade Organization Technical
500Y, and 980T/700Y),
Barriers to Trade (TBT) Committee.
4.1.2 Dual phase (DP) steel (Grades 440T/250Y, 490T/
290Y, 590T/340Y, 780T/420Y, and 980T/550Y), and
This specification is under the jurisdiction ofASTM Committee A01 on Steel,
Stainless Steel and Related Alloys and is the direct responsibility of Subcommittee
A01.19 on Steel Sheet and Strip. For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Current edition approved Nov. 1, 2019. Published November 2019. Originally contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
approved in 2013. Last previous edition approved in 2013 as A1088 – 13. DOI: Standards volume information, refer to the standard’s Document Summary page on
10.1520/A1088-13R19. the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
A1088 − 13 (2019)
1200 mm by coil, 1520 mm maximum OD, 600 mm ID, 10 000 kg
4.1.3 Transformation induced plasticity (TRIP) steel
maximum, for side reinforcement strut.
(Grades 690T/410Y and 780T/440Y).
4.2 Cold-rolled steel sheet is supplied for either exposed or
6. Chemical Composition
unexposed applications. Within the latter category, cold-rolled
6.1 The heat analysis of the steel shall conform to the
sheet is specified either “temper rolled” or “annealed last.” For
requirements shown in Table 1.
details on processing, attributes and limitations, and inspection
6.2 Each of the elements listed in Table 1 shall be included
standards, refer to Specification A568/A568M.
in the report of heat analysis, including each element in
5. Ordering Information
columns with grouped elements. When the amount of copper,
nickel, chromium, or molybdenum is less than 0.02 %, report
5.1 It is the purchaser’s responsibility to specify in the
the analysis as either <0.02 % or the actual determined value.
purchase order all ordering information necessary to describe
When the amount of vanadium, titanium, or niobium is less
the required material. Examples of such information include,
than 0.008 %, report the analysis as either <0.008 % or the
but are not limited to, the following:
actual determined value.
5.1.1 ASTM specification number and year of issue;
5.1.2 Name of product (steel sheet, cold-rolled);
NOTE 3—Niobium is also known as Columbium.
5.1.3 Designation of sheet [CP (Grades 600T/350Y, 780T/
6.2.1 See Specification A568/A568M for chemical analy-
500Y, or 980T/700Y), DP (Grades 440T/250Y, 490T/290Y,
sis procedures and product analysis tolerances.
590T/340Y, 780T/420Y, or 980T/550Y), or TRIP (Grades
690T/410Y or 780T/440Y)];
7. Mechanical Properties
5.1.4 Finish (see 8.1);
7.1 All designations and grades shall conform to the
5.1.5 Oiled or not oiled (see 8.2);
mechanical property requirements in Table 2.
5.1.6 Dimensions (show thickness, minimum or nominal,
7.1.1 All designations and grades shall conform to bake
width, flatness requirements, and length, (if cut lengths));
hardening index requirements included in Table 2. The mini-
NOTE 1—Not all producers are capable of meeting all the limitations of
mum increase in yield strength is based on the lower yield
the thickness tolerance tables in Specification A568/A568M. The pur-
stress, after a prestrained specimen has been exposed to a
chaser should contact the producer regarding possible limitations prior to
standard bake cycle of 170 °C for 20 min. The method for
placing an order.
measuring the bake hardening index is described in the Annex
5.1.7 Coil size requirements (specify maximum outside
A1.
diameter (OD), acceptable inside diameter (ID), and maximum
7.2 Mechanical property tests shall be conducted in accor-
mass);
dance with the methods specified in Specification A568/
5.1.8 Quantity;
A568M, or those prescribed by the purchaser.
5.1.9 Packaging;
5.1.10 Certification, if required, heat analysis and mechani-
7.3 Bending Properties Minimum Cold Bending Radi
...