Designation:A 1008/A 1008M –04b
Standard Specification for
Steel,Sheet,Cold-Rolled,Carbon,Structural,High-Strength Low-Alloy and High-Strength Low-Alloy with Improved Formability 1
This standard is issued under the fixed designation A 1008/A 1008M;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 (e )indicates an editorial change since the last revision or reapproval.
1.Scope*
1.1This specification covers cold-rolled,carbon,structural,high-strength low-alloy,and high-strength low-alloy with im-proved formability steel sheet,in coils and cut lengths.
1.2Cold rolled steel sheet is available in the designations as listed in 4.1.
1.3This specification does not apply to steel strip as described in Specification A 109/A 109M.
1.4The values stated in either inch-pound units or SI units are to be regarded separately as standard.Within the text,the SI units are shown in brackets.The values stated in each system are not exact equivalents;therefore,each system must be used independently of the other.
2.Referenced Documents 2.1ASTM Standards:2
A 109/A 109M Specification for Steel,Strip,Carbon (0.25Maximum Percent),Cold Rolled
A 366/A 366M Specification for Commercial Steel (CS),Sheet,Carbon (0.15Maximum Percentage),Cold-Rolled 3A 370Test Methods and Definitions for Mechanical Testing of Steel Products
A 568/A 568M Specification for Steel,Sheet,Carbon,and High-Strength,Low-Alloy,Hot-Rolled and Cold-Rolled,General Requirements for
A 620/A 620M Specification for Drawing Steel (DS),Sheet,Carbon,Cold-Rolled 3
A 941Terminology Relating to Steel,Stainless Steel,Re-lated Alloys,and Ferroalloys
E 18Test Methods for Rockwell Hardness and Rockwell Superficial Hardness of Metallic Materials
E 517Test Method for Plastic Strain Ratio r for Sheet Metal E 646Test Method for Tensile Strain-Hardening Exponents (n-Values)of Metallic Sheet Materials
3.Terminology 3.1Definitions:
3.1.1For definitions of other terms used in this specifica-tion,refer to Terminology A 941.
3.1.2stabilization —addition of one or more nitride-or carbide-forming elements,or both,such as titanium and columbium,to control the level of the interstitial elements of carbon and nitrogen in the steel.
3.1.2.1Discussion —Stabilizing improves formability and increases resistance to aging.
3.1.3vacuum degassing —process of refining liquid steel in which the liquid is exposed to a vacuum as part of a special technique for removing impurities or for decarburizing the steel.
3.2Definitions of Terms Specific to This Standard:
3.2.1aging —loss of ductility with an increase in hardness,yield strength,and tensile strength that occurs when steel that has been slightly cold worked (such as by temper rolling)is stored for some time.
3.2.1.1Discussion —Aging increases the tendency of a steel to exhibit stretcher strains and fluting.
4.Classification
4.1Cold-rolled steel sheet is available in the following designations:
4.1.1Commercial Steel (CS Types A,B,and C),4.1.2Drawing Steel (DS Types A and B),
N OTE 1—CS Type B and DS Type B describe the most common product previously included,respectively,in Specifications A 366/A 366M and A 620/A 620M.
4.1.3Deep Drawing Steel (DDS),
4.1.4Extra Deep Drawing Steel (EDDS),
4.1.5Structural Steel (SS grades 25[170],30[205],33[230]Types 1and 2,40[275]Types 1and 2,50[340],60[410],70[480],and 80[550]).
1
This specification is under the jurisdiction of ASTM Committee A01on Steel,Stainless Steel and Related Alloys and is the direct responsibility of Subcommittee A01.19on Steel Sheet and Strip.
Current edition approved July 1,2004.Published July 2004.Originally approved in 2000.Last previous edition approved in 2004as A 1008/A 1008M –04a.2
For referenced ASTM standards,visit the ASTM website,,or contact ASTM Customer Service at For Annual Book of ASTM Standards volume information,refer to the standard’s Document Summary page on the ASTM website.3
Withdrawn.
1
*A Summary of Changes section appears at the end of this standard.
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4.1.6High-Strength Low-Alloy Steel(HSLAS,in classes1 and2,in grades45[310],50[340].55[380],60[410],65[450], and70[480]in Classes1and2),and
4.1.7High-Strength Low-Alloy Steel with Improved Form-ability(HSLAS-F grades50[340],60[410],70[480],and 80[550]).
4.1.7.1HSLAS-F steel has improved formability when compared to HSLAS.The steel is fully deoxidized,made to fine grain practice and includes microalloying elements such as columbium,vanadium,zirconium,etc.The steel shall be treated to achieve inclusion control.
4.2When required for HSLAS and HSLAS-F steels,limi-tations on the use of one or more of the microalloy elements shall be specified on the order.
4.3Cold-rolled steel sheet is supplied for either exposed or unexposed applications.Within the latter category,cold-rolled sheet is specified either“temper rolled”or“annealed last.”For details on processing,attributes and limitations,and inspection standards,refer to Specification A568/A568M.
5.Ordering Information
5.1It is the purchaser’s responsibility to specify in the purchase order all ordering information necessary to describe the required material.Examples of such information include, but are not limited to,the following:
5.1.1ASTM specification number and year of issue;
5.1.2Name of material and designation(cold-rolled steel sheet)(include grade,type,and class,as appropriate,for CS, DS,DDS,EDDS,SS,HSLAS,or HSLAS-F)(see4.1);
5.1.2.1When a type is not specified for CS or DS,Type B will be furnished(see4.1);
5.1.2.2When a class is not specified for HSLAS,Class1 will be furnished(see4.1);
5.1.2.3When a type is not specified for SS33[230]and SS40[275],Type1will be furnished(see4.1);
5.1.3Classification(either exposed,unexposed,temper rolled,or annealed last)(see4.3);
5.1.4Finish(see9.1);
5.1.5Oiled or not oiled,as required(see9.2);
5.1.6Dimensions(thickness,thickness tolerance table(see 5.1.
6.1),width,and whether cut lengths or coils);
5.1.
6.1As agreed upon between the purchaser and the producer,material ordered to this specification will be supplied to meet the applicable thickness tolerance table shown in Specification A568/A568M;
N OTE2—Not all producers are capable of meeting all the limitations of the thickness tolerance tables in Specification A568/A568M.The pur-chaser should contact the producer regarding possible limitations prior to placing an order.
5.1.7Coil size(must include inside diameter,outside diam-eter,and maximum weight);
5.1.8Copper bearing steel(if required);
5.1.9Quantity;
5.1.10Application(part identification and description); 5.1.11Special requirements(if required),and
5.1.12A report of heat analysis will be supplied,if re-quested,for CS,DS,DDS,and EDDS.For materials with required mechanical properties,SS,HSLAS,and HSLAS-F,a report is required of heat analysis and mechanical properties as determined by the tension test.
N OTE3—A typical ordering description is as follows:ASTM A 1008-XX,cold rolled steel sheet,CS Type A,exposed,mattefinish,oiled, 0.035by30in.by coil,ID24in.,OD48in.,max weight15000lbs, thickness tolerance Table18of Specification A568/A568M,100000lb, for part No.4560,Door Panel.
or:
ASTM A1008M-XX,cold-rolled steel sheet,SS grade275,unexposed, mattefinish,oiled,0.88mm by760mm by2440mm,thickness tolerance Table A1.15of Specification A568/A568M,10000kg,for shelf bracket.
6.General Requirements for Delivery
6.1Material furnished under this specification shall con-form to the applicable requirements of the current edition of Specification A568/A568M unless otherwise provided herein.
7.Chemical Composition
7.1The heat analysis of the steel shall conform to the chemical composition requirements of the appropriate desig-nation shown in Table1for CS,DS,DDS,and EDDS and in Table2for SS,HSLAS,and HSLAS-F.
7.2Each of the elements listed in Table1and Table2shall be included in the report of the heat analysis.When the amount of copper,nickel,chromium,or molybdenum is less than 0.02%,report the analysis as<0.02%or the actual determined value.When the amount of vanadium,columbium,or titanium is less than0.008%,report the analysis as<0.008%or the actual determined value.
xposed7.3Sheet steel grades defined by this specification are suitable for welding if appropriate welding conditions are selected.For certain welding processes,if more restrictive composition limits are desirable,they shall be specified at the time of inquiry and confirmed at the time of ordering.
8.Mechanical Properties
8.1CS,DS,DDS,and EDDS:
8.1.1Typical nonmandatory mechanical properties for CS, DS,DDS and EDDS are shown in Table3.
8.1.2The material shall be capable of being bent,at room temperature,in any direction through180°flat on itself without cracking on the outside of the bent portion(see Section14of Test Methods and Definitions A370).
8.1.3Sheet of these designations except for EDDS are subject to aging dependent upon processing factors such as the method of annealing(continuous annealing or box annealing), and chemical composition.For additional information on aging,see Appendix X1of Specification A568/A568M.
8.1.4EDDS steel is stabilized to be nonaging and so is not subject to stretcher strains andfluting.Other steels are pro-cessed to be nonaging;please consult your supplier.
8.2SS,HSLAS and HSLAS-F:
8.2.1The available strength grades for SS,HSLAS and HSLAS-F are shown in Table4.
8.2.2Tension Tests:
8.2.2.1Requirements—Material as represented by the test specimen shall conform to the mechanical property require-ments specified in Table4.These requirements do not apply to the uncropped ends of unprocessed
coils.
8.2.2.2Number of Tests —Two tension tests shall be made from each heat or from each 50tons [45000kg].When the amount of finished material from a heat is less than 50tons [45000kg],one test shall be made.When material rolled from heat differs 0.050in.[1.27mm]or more in thickness,one tension test shall be made from the thickest and thinnest material regardless of the weight represented.8.2.2.3Tension test specimens shall be taken at a point immediately adjacent to the material to be qualified.
8.2.2.4Tension test specimens shall be taken from the full thickness of the sheet.
8.2.2.5Tension test specimens shall be taken from a loca-tion approximately halfway between the center of the sheet and the edge of the material as rolled.
TABLE 1Chemical Composition A
For Cold Rolled Steel Sheet Designations CS,DS,DDS,and EDDS
Composition,%Heat Analysis
(Element Maximum Unless Otherwise Shown Designation C Mn P S Al Si Cu Ni Cr B Mo V Cb Ti N CS Type A C ,D ,E ,F 0.100.600.0.20G 0.200.150.060.0080.CS Type B C 0.02to 0.150.600.0.20G 0.200.150.060.0080.CS Type C C ,D ,E ,F 0.080.600.0.20G 0.200.150.060.0080.DS Type A D ,H 0.080.500.0200.0300.01min ...0.200.200.150.060.0080.DS Type B 0.02to 0.080.500.0200.0300.02min ...0.200.200.150.060.0080.DDS E ,F 0.060.500.0200.0250.01min ...0.200.200.150.060.0080.EDDS I
0.02
0.40
0.020
0.020
0.01min
...
0.10
0.10
0.15
0.03
0.10
0.10
0.15
...
A Where an ellipsis (...)appears in the table,there is no requirement,but the analysis result shall be reported.
B
Chromium is permitted,at the producer’s option,to 0.25%maximum when the carbon content is less than or equal to 0.05%.C
When an aluminum deoxidized steel is required for the application,it is permissible to order Commercial Steel (CS)to a minimum of 0.01%total aluminum.D
Specify Type B to avoid carbon levels below 0.02%.E
It is permissible to furnish as a vacuum degassed or chemically stabilized steel,or both,at the producer’s option.F
For carbon levels less than or equal to 0.02%,it is permissible to use vanadium,columbium or titanium,or a combination thereof,as stabilizing elements at the producer’s option.In such cases,the applicable limit for vanadium or columbium shall be 0.10%max.and the limit on titanium shall be 0.15%max.G
When copper steel is specified,the copper limit is a minimum requirement.When copper steel is not specified,the copper limit is a maximum requirement.H
It is permissible to furnish DS Type A as a vacuum degassed steel,at the producers option.I
Shall be furnished as a vacuum degassed and stabilized steel.
TABLE 2Chemical Composition A
For Cold Rolled Steel Sheet Designations SS,HSLAS,and HSLAS-F
%Heat Analysis,Element Maximum unless otherwise shown
Designation
C Mn P S Al Si Cu B Ni Cr Mo V Cb Ti N SS:Grade 25[170]0.200.600.035
0.200.200.150.060.0080.Grade 30[205]0.200.600.0.200.200.150.060.0080.Grade 33[230]Type 10.200.600.0.200.200.150.060.0080.Grade 33[230]Type 20.150.600.0.200.200.150.060.0080.Grade 40[275]Type 10.200.900.0.200.200.150.060.0080.Grade 40[275]Type 2
0.150.600.0.200.200.150.060.0080.Grade 50[340]0.200.700.0.200.200.150.060.0080.Grade 60[410]0.200.700.0.200.200.150.060.0080.Grade 70[480]0.200.700.0.200.200.150.060.0080.Grade
80[550]
0.20
0.60
0.035
0.035
......
0.20
0.20
0.15
0.06
0.008
0.008
0.008
...
HSLAS:C
Grade 45[310]Class 10.22  1.650.0.200.200.150.060.005min 0.005min 0.005min ...Grade 4
5[310]Class 20.15  1.650.0.200.200.150.060.005min 0.005min 0.005min ...Grade 50[340]Class 10.23  1.650.0.200.200.150.060.005min 0.005min 0.005min ...Grade 50[340]Class 20.15  1.650.0.200.200.150.060.005min 0.005min 0.005min ...Grade 55[380]Class 10.25  1.650.0.200.200.150.060.005min 0.005min 0.005min ...Grade 55[380]Class 20.15  1.650.0.200.200.150.060.005min 0.005min 0.005min ...Grade 60[410]Class 10.26  1.650.0.200.200.150.060.005min 0.005min 0.005min ...Grade 60[410]Class 20.15  1.650.0.200.200.150.060.005min 0.005min 0.005min ..
.
Grade 65[450]Class 10.26  1.650.0.200.200.150.060.005min 0.005min 0.005min D Grade 65[450]Class 20.15  1.650.0.200.200.150.060.005min 0.005min 0.005min D Grade 70[480]Class 10.26  1.650.0.200.200.150.160.005min 0.005min 0.005min D Grade 70[480]
Class 20.15  1.650.0.200.200.150.160.005min 0.005min 0.005min
D
HSLAS-F:C
Grade 50[340]and 60[410]0.15  1.650.0.200.200.150.060.005min 0.005min 0.005min D Grade 70[480]and 80[550]
0.15  1.650.0.200.200.150.160.005min 0.005min 0.005min
D
A Where an ellipsis (...)appears in the table,there is no requirement but,the analysis shall be reported.
B
When copper is specified,the copper limit is a minimum requirement.When copper steel is not specified,the copper limit is a maximum requirement.C
HSLAS and HSLAS-F steels contain the strengthening elements columbium (niobium),vanadium,titanium,and molybdenum added singly or in combination.The minimum requirements only apply to the microalloy elements selected for strengthening of the steel.D
The purchaser has the option of restricting the nitrogen content.It should be noted that,depending on the microalloying scheme (for example,use of vanadium)of the producer,nitrogen may be a deliberate
addition.Consideration should be made for the use of nitrogen binding elements (for example,vanadium,
titanium).
8.2.2.6Tension test samples shall be taken with the length-wise axis of the test specimen parallel to the rolling direction (longitudinal test).
8.2.2.7Test Method —Yield strength shall be determined by either the 0.2%offset method or the 0.5%extension under load method unless otherwise specified.8.2.3Bending Properties :
8.2.3.1The suggested minimum inside radii for cold bend-ing are listed in Appendix X1and is discussed in more detail in Specification A 568/A 568M (Section 6).Where a tighter
bend radius is required,where curved or offset bends are involved,or where stretching or drawing are also a consider-ation,the producer shall be consulted.
9.Finish and Appearance 9.1Surface Finish :
9.1.1Unless otherwise specified,the sheet shall have a matte finish.When required,specify the appropriate surface texture and condition.For additional information,see the Finish and Condition section of Specification A 568/A 568M.
TABLE 3Typical Ranges of Mechanical Properties A
(Nonmandatory)B
For Cold Rolled Steel Sheet Designations CS,DS,DDS and EDDS
Designation
Yield Strength C
Elongation in 2in.[50
mm]%C
r m Value D n -Value E
ksi
MPa
CS Types A,B,and C 20to 40[140to 275]$30F F
DS Types A and B 22to 35[150to 240]$36  1.3to 1.70.17to 0.22DDS 17to 29[115to 200]$38  1.4to 1.80.20to 0.25EDDS
15to 25
[105to 170]
$40
1.7to
2.10.23to 0.27
A
These typical mechanical properties apply to the full range of steel sheet thicknesses.The yield strength tends to increase,the elongation decreases and some of the formability values tend to decrease as the sheet thickness decreases.B
The typical mechanical property values presented here are nonmandatory.They are provided to assist the purchaser in specifying a suitable steel for a given application.Values outside of these ranges are to be expected.C
Yield Strength and elongation are measured in the longitudinal direction in accordance with Test Methods and Definitions A 370.D
Average plastic strain ratio (r m value)as determined by Test Method E 517.E
The strain hardening exponent (n-value)as determined by Test Method E 646.F
No typical properties have been established.
TABLE 4Mechanical Property Requirements A
For Cold Rolled Steel Sheet Designations SS,HSLAS,and HSLAS-F
Designation
Yield Strength,min
Tensile Strength,min
Elongation 50mm,min,%
ksi
[MPa]ksi [MPa]SS:
Grade 25[170]25[170]42[290]26Grade 30[205]
30[205]45[310]24Grade 33[230]Types 1and 233[230]48[330]22Grade 40[275]Types 1and 240[275]52[360]20Grade 50[340]50[340]65[410]18Grade 60[410]60[410]75[480]12Grade 70[480]70[480]85[540]6
Grade 80[550]
80B
[550]
82
[565]
C
HSLAS:Grade 45[310]Class 145[310]60[410]22Grade 45[310]Class 245[310]55[380]22Grade 50[340]Class 150[340]65[450]20Grade 50[340]Class 250[340]60[410]20Grade 55[380]Class 155[380]70[480]18Grade 55[380]Class 255[380]65[450]18Grade 60[410]Class 160[410]75[520]16Grade 60[410]Class 260[410]70[480]16Grade 65[450]Class 165[450]80[550]15Grade 65[450]Class 265[450]75[520]15Grade 70[480]Class 170[480]85[585]14Grade 70
[480]Class 270[480]80[550]14
HSLAS-F:
Grade 50[340]50[340]60[410]22Grade 60[410]60[410]70[480]18Grade 70[480]70[480]80[550]16Grade 80[550]
80[550]90[620]14
A For coil products,testing by the producer is limited to the end of the coil.Mechanical properties throughout the coil shall comply with the minimum values specified.B
On this full-hard product,the yield strength approaches the tensile strength and since there is no halt in the gage or drop in the beam,the yield point shall be taken as the yield stress at 0.5%extension under load.C
There is no requirement for elongation in 2in.for SS Grade
80.
For additional information see“Finish and Condition”sec-tion of Specification A568/A568M.
9.2Oiling:
9.2.1Unless otherwise specified,the sheet shall be oiled.
9.2.2When required,specify the sheet to be furnished not oiled(dry).
10.Retests and Resamples
10.1Retests—If the results on an original tension test specimen are within2ksi[14MPa]of the required tensile strength,within1ksi[7MPa]of the required yield point,or within two percentage points of the required elongation,a retest shall be permitted for which one test specimen selected at random shall be tested.If the results of this retest specimen satisfy the specified mechanical properties and all other re-quirements of the applicable specification are satisfied,the material shall be accepted.Retests are permitted in accordance with Specification A568/A568M.
10.2Resamples—Resamples are permitted in accordance with Specification A568/A568M.
11.Certification
11.1A report of heat analysis shall be supplied,if requested, for CS,DS,DDS,and EDDS steels.For material with required mechanical properties,SS,HSLAS,and HSLAS-F,a report is required of heat analysis and mechanical properties as deter-mined by the tension test.
11.2The report shall include the purchase order number,the ASTM designation number and year date,product designation, grade,type or class,as applicable,the heat number,and as required,heat analysis and mechanical properties as indicated by the tension test.
11.3A signature is not required on the test report.However, the document shall clearly identify the organization submitting the report.Notwithstanding the absence of a signature,the organization submitting the report is responsible for the content of the report.
11.4A Material Test Report,Certificate of Inspection,or similar document printed from or used in electronic form from an electronic data interchange(EDI)transmission shall be regarded as having the same validity as a counterpart printed in the certifier’s facility.The content of the EDI transmitted document must meet the requirements of the invoked ASTM standard(s)and conform to any existing EDI agreement be-tween the purchaser and the supplier.Notwithstanding the absence of a signature,the organization submitting the EDI transmission is responsible for the content of the report. 12.Product Marking
12.1In addition to the requirements of Specification A568/ A568M,each lift or coil shall be marked with the designation shown on the order(CS(Type A,B,or C),DS(Type A or B), DDS,EDDS,SS,HSLAS,or HS
LAS-F).The designation shall be legibly stenciled on the top of each lift or shown on a tag attached to each coil or shipping unit.
13.Keywords
13.1carbon steel sheet;cold-rolled steel sheet;steel sheet; commercial steel;drawing steel;deep drawing steel;extra deep drawing steel;high-strength low-alloy steel;high-strength low-alloy steel with improved formability;structural
steel

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