ENGINEERING MATERIAL SPECIFICATION
STEEL, SHEET, COLD ROLLED, LOW CARBON, WSS-M1A345-A1
GENERAL FORMABILITY
STEEL, SHEET, COLD ROLLED, LOW CARBON, WSS-M1A345-A2
IMPROVED FORMABILITY
STEEL, SHEET, COLD ROLLED, LOW CARBON, WSS-M1A345-A3
HIGH FORMABILITY
STEEL, SHEET, COLD ROLLED, LOW CARBON, WSS-M1A345-A4
EXTRA HIGH FORMABILITY
1. SCOPE
The materials defined by these specifications are cold rolled low carbon steel sheet suitable for cold
forming (see para 4.1). Specification WSS-M1P94-A shall be used where precoating by the steel
supplier is required.
2. APPLICATION
These specifications were released originally for 2003 model year automotive body parts. They also
simplify material designation on Engineering Drawings when steels with mechanical properties suitable
for designing and forming the part are to be specified and components could be sourced in several
countries.
The abbreviations heading the tables (see para 4.4) indicate the country or company of origin of the
specification as follows:
ISO International Standards Organization
BS UK of GB & NI (British Standards Institute)
DIN Federal Republic of Germany (Deutsches Institute)
EN European Union
ASTM USA (American Society for Testing & Materials)
JIS Japan Industrial Standards
JFS Japan Iron and Steel Federation Standards
MES Mazda Engineering Standards
Note: Because of regional supply base variations and to make the most effective use of these
specifications, users should consult with Materials Engineering.
Note: Interstitial Free (IF) steel supplied to WSS-M1A345-A3/A4 usually contains titanium as an
alloying addition. Such titanium alloyed steels, if subsequently surface treated by a
nitrocarburising/oxidizing process, risk becoming embrittled because of the formation of an
ultrafine TiN precipitate. IF steels containing vanadium and niobium are also thought to be
prone to this effect. Accordingly, special consideration should be given for IF steel parts
intended to be subjected to the above noted surface treatment processes.
Date Action Revisions
2006 05 03 Revised European specific re: gauge & mech props; Rev 3.2.1,
3.5, 4.8, 4.14 & 4.15; Added 3.2.2 & 3.2.3 S Buckingham
2004 05 26 Revised Rev para 2 (for Ford Europe only) R. Lord
2000 09 21 Activated K J Thurgood (FAO), M Fukahori (Mazda)
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ENGINEERING MATERIAL SPECIFICATION
WSS-M1A345-A1/A4
Note: Please be aware that these specifications do not yet deal with hot dipped galvanized (ie. hot
dipped zinc) coatings. The previous sentence does not apply to Ford Europe. For Ford
Europe only, the words "hot dipped galvannealed" in paragraphs 3.4 and 4.13 (Table 7) shall
also be interpreted to mean "hot dipped galvanized".
3. REQUIREMENTS
Material specification requirements are to be used for initial qualification of materials.
3.1 STANDARD REQUIREMENTS FOR PRODUCTION MATERIALS
Material suppliers and part producers must conform to the Company's Standard Requirements
For Production Materials (WSS-M99P1111-A).
3.2 DIMENSIONS AND DIMENSIONAL TOLERANCES
3.2.1 Thickness and Thickness Tolerances (see para 4.5)
The thickness specified on the Engineering Drawing or CAD (computer aided design)
file shall be a minimum or a nominal, depending upon the vehicle model program.
3.2.2 Use of Engineering Specifications for Thickness (see also para 4.5)
This para is for FOE (Ford of Europe) and PAG (Premier Automotive Group) ONLY.
Parts newly designed (ie. not 'carry-over') for 2000 to 2006 model year, shall satisfy
the thickness and thickness tolerance requirements of ES-YC15-1N260-A(-)**.
Parts newly designed (ie. not 'carry-over') for 2006 model year onwards (beginning
with EuCD), shall satisfy the thickness and thickness tolerance requirements of
ES6G91-1N260-A(-)**.
Exceptions to this (for FOE) shall be authorized by PDE Materials Engineering &
Testing (ME&T) via MAS (Materials Authorization
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ENGINEERING MATERIAL SPECIFICATION
WSS-M1A345-A1/A4
4.5 THICKNESS TOLERANCE (CAUTION)
If and when choosing a minimum gauge from ES-YC15-1N260-AA, if the previous choice of
gauge was nominal, it is important to avoid generating an inadvertent increase in the ACTUAL
thickness of the component, and consideration should be given to specifying the next lowest
minimum gauge e.g. for an existing 0.80 mm nominal gauge, the nearest equivalent minimum
gauge in ES-YC15-1N260-AA is 0.75 mm.
Additionally, it may be necessary to consult with JFS A 2001 or JFS A 1001, to select a
Japanese nominal gauge which satisfies the intent of ES-YC15-1N260-AA.
4.6 OTHER DIMENSIONS, TOLERANCES AND ASSOCIATED ITEMS
. Examples of the relevant national standards are EN 10131, ASTM A 568M, JFS A 2001.
4.7 STEEL CLEANLINESS REFEREE METHOD
. Examples are JFS A 2001, MES MM 101.
4.8 FORMABILITY
The SMRL may refer to National or International Standards.
4.9 SURFACE FINISH AND APPREARANCE
4.9.1 Japanese Guidance
The surface finish of the steel sheet shall be specified by the mean surface roughness
(Ra) and the surface waviness (Wca). Identification symbols shall be used as follows:
. Class 1 (known as 'W' in MES MM 101) surface shall be specified for those parts
of outer panels that require distinctness of image: Ra 0.5 - 1.2, Wca 0.6 max.
(see para 3.7).
. Class 2 (No-Symbol in MES MM 101) surface shall be specified for those parts of
outer panels that do not require distinctness of image. Such surfaces are
sometimes referred to as 'Ordinary' or 'Non-Visually Critical': Ra 0.5 - 1.5. An
example of this type of surface is a 'B' pillar (see para 3.7).
. Class 3 (known as 'N' in MES MM 101) surface shall be specified for those parts
of inner panels that are concealed during normal use: Ra 0.5 - 2.0. (see
para 3.7).
4.9.2 European Guidance
Where the surface appearance is specified, the mean surface roughness Ra (to SEP
1940 (intended to be replaced by EN 10049)) (2.5 mm cut-off length; 1 micrometer
(+/- 0.5 micrometer) band width; 12.5 mm min effective traverse length; flat skid type)
is defined thus:
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ENGINEERING MATERIAL SPECIFICATION
WSS-M1A345-A1/A4
. Class 1 (also known as 'B' (EN 10130) or full finish (FF)); Ra 1.1 - 1.6 (2.5 mm
cut-off).
Peak Density 50 ppcm (peak valley pairs per centimeter) min (at 2.5 mm cut-off).
. Class 2 (also known as 'A' (EN 10130) or General Purpose (GP)): Ra 1.1 - 1.7
(2.5 mm cut-off)
Peak Density not defined.
. Class 3
Ra and Peak Density not defined.
4.9.3 North American Guidance
Refer to the Advanced Technology and Material Engineering (AT&ME) Department in
the Dearborn PDC (Product Development Center).
4.10 PAINTABILITY
. Examples are MES MN 606, ESB-M2P130-A (Class 1 surface applications),
ESB-M2P129-B (Class 2 and 3 surface applications)
4.11 CHARACTERISTICS OF COLD ROLLED MATERIALS (WSS-M1A345-A1/A2)
TABLE 1: Typical Values Based On European Practice
(For Uncoated and (Electrolytically Coated))
r n
Grade Yield Strength Tensile Strength % Elongation (A80) 90 90 r - bar n - bar
(Re) (MPa) (Rm) (MPa) (80 mm GL)
1) 4) 4) 2) 4) 3) 3)
DC01(+ZE) 169-221 288 - 362 33 - 46 1.47 - 2.39 0.18 - 0.22 n/a n/a
DC03(+ZE) 157 - 212 289 - 343 36 - 48 1.79 - 2.33 0.19 - 0.23 n/a n/a
DC04(+ZE) 149 - 198 277 - 331 36 - 49 1.90 - 2.74 0.19 - 0.23 n/a n/a
DC05(+ZE) 136 - 204 279 - 323 40 - 51 1.89 - 2.82 0.19 - 0.25 n/a n/a
(n/a means not applicable)
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ENGINEERING MATERIAL SPECIFICATION
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Notes:
1) The values of yield stress are the 0.2% proof stress for products which do not present a
definite yield point, and the lower yield stress (Rel) for others. For thin gauges, the yield
stress value tends to increase. Up to 20 MPa is typical for < 0.7 mm and > 0.5 mm. Up
to 40 MPa is typical for < 0.5 mm.
2) For thin gauges, the % elongation value tends to decrease. Up to 2 units is typical for <
0.7 mm and > 0.5 mm.
3) The values of r90 and n90 only apply to products of thickness > 0.5 mm.
4) Test specimens taken in the transverse (i.e., 90° to the rolling) direction.
TABLE 2: Typical Values Based on North American Practice
(For Uncoated and Electrolytically Coated)
Test specimens and method based on ASTM standards. Values for Yield, Tensile Strength and
Elongation area based on specimens taken in the longitudinal direction (0 deg to rolling).
r n
Grade Yield Strength Tensile Strength % Elongation (A50) 90 90 r - bar n - bar
(Re) (MPa) (Rm) (MPa) (50 mm GL)
CS 170 - 229 285 - 350 37 - 44 n/a n/a 1.40 - 2.10 0.164 - 0.225
DS 148 - 216 273 - 339 38 - 51 n/a n/a 1.46 - 2.15 0.182 - 0.249
DDS 135 - 206 274 - 331 39 - 50 n/a n/a 1.63 - 2.32 0.190 - 0.264
(n/a means not applicable)
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ENGINEERING MATERIAL SPECIFICATION
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TABLE 3: Typical Values Based on Japanese Practice
(For Uncoated and Electrolytically Coated; Thickness 0.80 mm.)
Test specimens and method based on JIS Z 2201 and JFS T 2001. Values for Yield, Tensile Strength
and Elongation area based on specimens taken in the longitudinal direction (0° to rolling). The figures
in brackets (parentheses) for Yield strength and %Elongation, indicate typical values.
r n
Grade Yield Strength Tensile Strength % Elongation (A50) 90 90 r - bar n - bar
(Re) (MPa) (Rm) (MPa) (50 mm GL)
SPCN1/ 135 - 255 270 min 39 - 48 n/a n/a n/a n/a
(195) (43)
JSC270C
SPCN2/ 125 - 215 270 min 42 - 51 n/a n/a 1.2 min n/a
JSC270D (170) (45)
(n/a means not applicable)
4.12 CHARACTERISTICS OF COLD ROLLED MATERIALS (WSS-M1A345-A3/A4)
TABLE 4: Typical Values Based On European Practice
(For Uncoated and (Electrolytically Coated))
r n
Grade Yield Strength Tensile Strength % Elongation (A80) 90 90 r - bar n - bar
(Re) (MPa) (Rm) (MPa) (80 mm GL)
1) 4) 4) 2) 4) 3) 3)
DC06(+ZE) 116 - 164 275 - 307 41 - 50 2.04 - 2.84 0.22 - 0.26 n/a n/a
(n/a means not applicable)
Notes:
1. The values of yield stress are the 0.2% proof stress for products which do not present a
definite yield point and the lower yield stress (Rel) for others. For thin gauges, the yield
stress value tends to increase. Up to 20 MPa is typical for < 0.7 mm and > 0.5 mm. Up to
40 MPa is typical for < 0.5 mm.
2. For thin gauges, the % elongation value tends to decrease. Up to 2 units is typical for <
0.7 mm and > 0.5 mm.
3. The values of r90 and n90 only apply to products of thickness > 0.5 mm.
4. Test specimens taken in the transverse (i.e., 90° to the rolling) direction.
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TABLE 5: Typical Values Based on North American Practice
(For Uncoated and Electrolytically Coated)
Test specimens and method based on ASTM standards. Values for Yield, Tensile Strength and
Elongation are based on specimens taken in the longitudinal direction (0 deg to rolling).
r n
Grade Yield Strength Tensile Strength % Elongation (A50) 90 90 r - bar n - bar
(Re) (MPa) (Rm) (MPa) (50 mm GL)
EDDS 116 - 183 275 - 326 40 - 51 n/a n/a 1.60 - 2.41 0.209 - 0.269
(n/a means not applicable)
TABLE 6: Typical Values Based on Japanese Practice
(For Uncoated and Electrolytically Coated; Thickness 0.80 mm.)
Test specimens and method based on JIS Z 2201 and JFS T 2001. Values for Yield, Tensile Strength
and Elongation area based on specimens taken in the longitudinal direction (0 deg to rolling). The
figures in brackets (parentheses) for Yield strength and %Elongation, indicate typical values.
r n
Grade Yield Strength Tensile Strength % Elongation (A50) 90 90 r - bar n - bar
(Re) (MPa) (Rm) (MPa) (50 mm GL)
SPCN3
120 - 195 270 min 44 - 52 n/a n/a 1.4 min n/a
JSC270E (160) (47)
SPCN4
110 - 175 270 min 46 - 54 n/a n/a 1.6 min n/a
JSC270F (145) (49)
(n/a means not applicable)
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4.13 CHARACTERISTICS OF COLD ROLLED MATERIALS (WSS-M1A345-A1/A2/A3/A4)
TABLE 7: Typical Values Based On European Practice
(For Hot Dipped Galvannealed)
r n
Grade Yield Strength Tensile Strength % Elongation (A80) 90 90 r - bar n - bar
(Re) (MPa) (Rm) (MPa) (80 mm GL)
1) 4) 4) 2) 4) 3) 3)
DX51D + ZF 185 - 241 306 - 366 34 - 42 1.10 - 2.30 0.17 - 0.21 n/a n/a
DX52D + ZF 166 - 216 279 - 327 37 - 46 1.34 - 2.40 0.19 - 0.23 n/a n/a
DX53D + ZF 155 - 185 287 - 311 41 - 49 1.82 - 2.46 0.20 - 0.24 n/a n/a
DX54D + ZF 146 - 174 287 - 313 38 - 48 1.76 - 2.42 0.20 - 0.24 n/a n/a
DX56D + ZF
(n/a means not applicable)
Notes:
1) The values of yield stress are the 0.2% proof stress for products which do not present a
definite yield point, and the lower yield stress (Rel) for others. For thin gauges, the yield
stress value tends to increase. Up to 20 MPa is typical for < 0.7 mm and > 0.5 mm. Up
to 40 MPa is typical for < 0.5 mm.
2) For thin gauges, the % elongation value tends to decrease. Up to 2 units is typical for <
0.7 mm and > 0.5 mm.
3) The values of r90 and n90 only apply to products of thickness > 0.5 mm.
4) Test specimens taken in the transverse (i.e., 90° to the rolling) direction.
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ENGINEERING MATERIAL SPECIFICATION
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TABLE 8: Typical Values Based on North American Practice
(For Hot Dipped Galvannealed)
Test specimens and method based on ASTM standards. Values for Yield, Tensile Strength and
Elongation area based on specimens taken in the longitudinal direction (0 deg to rolling).
r n
Grade Yield Strength Tensile Strength % Elongation (A50) 90 90 r - bar n – bar
(Re) (MPa) (Rm) (MPa) (50 mm GL)
CS 223 - 315 323 - 379 33 - 45 n/a n/a 1.05 - 1.39 0.161 - 0.240
DS 165 - 230 294 - 344 39 - 47 n/a n/a 1.37 - 1.78 0.197 - 0.240
DDS 140 - 188 289 - 330 41 - 50 n/a n/a 1.68 - 2.09 0.226 - 0.265
EDDS 124 - 176 286 - 331 42 - 50 n/a n/a 1.70 - 2.31 0.223 - 0.265
n/a means not applicable)
TABLE 9: Typical Values Based on Japanese Practice
(For Hot Dipped Galvannealed; Thickness 0.80 mm.)
Test specimens and method based on JIS Z 2201 and JFS T 2001. Values for Yield, Tensile Strength
and Elongation area based on specimens taken in the longitudinal direction (0 deg to rolling). The
figures in brackets (parentheses) for Yield strength and % Elongation, indicate typical values. %
Elongation values are applicable where the sum of the minimum coating mass for BOTH surfaces
exceeds 90 g/m2.
r n
Grade Yield Strength Tensile Strength % Elongation (A50) 90 90 r - bar n - bar
(Re) (MPa) (Rm) (MPa) (50 mm GL)
SPCM1
175 – 295 270 min 36 – 45 n/a n/a n/a n/a
JAC270C (235) (40)
SPCM2
125 – 215 270 min 41 – 50 n/a n/a 1.2 min n/a
JAC270D (170) (44)
SPCM3
120 – 195 270 min 43 – 51 n/a n/a 1.4 min n/a
JAC270E (155) (46)
SPCM4
110 – 175 270 min 45 – 53 n/a n/a 1.6 min n/a
JAC270F (145) (48)
Note: The above grades are taken from JFS A 3011 and MES MM 108.
(n/a means not applicable)
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ENGINEERING MATERIAL SPECIFICATION
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4.14 REFERENCE DOCUMENTS
The reference documents are:
ASTM A 366M BS 1449 ASTM E 8M WSS-M1P94-A
EN 10049 ASTM A 568M EN 10002 ISO 3574
ESB-M2P130-A ESB-M2P129-B ISO 6892 DIN 1623
JIS G 3141 JFS A 2001 JFS A 3011 MES MN 606
ISO 2566/1 JIS Z 2201 JFS T 2001 JFS A 1001
ASTM A 620M EN 10130 ASTM A 963M EN 10131
SEP 1940 ASTM A 969M ES MM 101 MES MM 108
ES-YC15-1N260-AA ES-6H52-00001-A(-) WSS-M99P1111-A V1P-03-132
WSS-M99P9999-A1 ES6G91-1N260-A(-)
4.15 METHOD OF SPECIFYING
The specification on the Engineering Drawing or CAD (computer aided design) file shall
include, if applicable, the surface quality; also the coating(s) defined by WSS-M1P94-A.
e.g. Steel, Sheet, Cold Rolled, Low Carbon, Improved Formability, uncoated, for a non-visible
bracket of 2 mm thickness, would be specified thus:
. Steel to WSS-M1A345-A2: Class 3
e.g. Steel, Sheet, Cold Rolled, Low Carbon, High Formability, uncoated, for a visible exterior
body panel, would be specified thus:
. Steel to WSS-M1A345-A3: Class 1
e.g. Steel, Sheet, Cold Rolled, Low Carbon, Improved Formability, coated with double sided
Electrolytic Zinc, (typical European usage), for the boot (trunk) inner panel, would be specified
thus:
. Steel to WSS-M1A345-A2, coated to WSS-M1P94-A: 50G50G-EL, Class 2
e.g. Steel, Sheet, Cold Rolled, Low Carbon, Improved Formability, differentially coated with
double sided Electrolytic Zinc, (typical North American usage), for the bonnet (hood) outer
panel, would be specified thus:
. Steel to WSS-M1A345-A2, coated to WSS-M1P94-A: 98G60G-EL, Class 1
NOTE: This document is dedicated to the memory of the late Brian Lawrence Edwards (1939 -
1999), whose foresight developed the first of this style of specifications in 1994.
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