Mild Steels
Grade
Commercial Steel (CS)
Drawing/Forming Steel (DS/FS)
Deep Drawing Steel (DDS)
Extra Deep Drawing Steel (EDDS)
Hot Rolled
Uncoated
Yes
Yes
Yes
-
Uncoated
Yes
Yes
Yes
Yes
Cold Rolled
EG
Yes
Yes
Yes
Yes
HDGI
Yes
Yes
Yes
Yes
HDGA
Yes
Yes
Yes
Yes
Extra Deep Drawing Steel Plus (EDDS+)
Yes: Products Commercially Available
- - - - Yes
ArcelorMittal offers a variety of mild and drawing quality steels with a range of formability and coating conditions.
Product Characteristics
ArcelorMittal offers a wide range of Mild steels. Depending on the formability requirements the appropriate sheet steel grade may be selected. Steel grades range from Commercial Steel (CS), which have the reasonable formability to grades like Extra Deep Drawing Steel Plus (EDDS Plus) which offers superior formability.
All of these grades are low carbon grades. Some of the highly formable steels contain ultra-low levels of carbon and are fully stabilized with microalloying elements like titanium and/or niobium. These steels are also commonly known as interstitial-free steels, i.e. these steels have no free, interstitially available, carbon or nitrogen.
Application
These steels are the most widely used grades in the automotive industry. They offer excellent formability and can be used for a range of parts from simple small brackets to complicated shapes like wheelhouses and floor-pans. The lower strength of these steels, can limit their applications where dent resistance, durability and high strength requirements are essential. These grades have excellent manufacturability and can be easily joined using conventional welding techniques. Except for CS, all others grades are available as exposed quality steels, also.
Note: Information contained in this document is subject to change. Please contact our sales team whenever you place an order to ensure that your requirements are fully met. Please contact us if you have a specific requirement that is not included in the range of products and services covered by this document.
Update: August 2009
1

Representative Stress-Strain curves of various Mild Steels grades
Stress-Strain curve data is available upon request
Grade Availability - ArcelorMittal Products
Hot Rolled
Uncoated Uncoated
CS
CS Type A
CS
CS Type A
CS Type B CS Type B
EG: Electrogalvanized
HDGI: Hot-Dip-Galvanalized
HDGA: Hot-Dip-Galvannealed
EG
CS
CS Type A
CS Type B
Cold Rolled
HDGI
CS
CS Type A
CS Type B
ArcelorMittal offers several grades of Commercial Steels with various coating conditions.
Application
HDGA
CS
CS Type A
CS Type B
Commercial steels are intended for applications where the product is subject to bending or moderate forming.
Note: Information contained in this document is subject to change. Please contact our sales team whenever you place an order to ensure that your requirements are fully met. Please contact us if you have a specific requirement that is not included in the range of products and services covered by this document.
Update: August 2009
2

Chemistry
Product
CS Type A
CS Type B
CS
Processing
Depending on the applications, Commercial Steels are produced using vacuum degassed ultra-low-carbon or regular low-carbon compositions. Steels are then cast into slabs and hot rolled. Hot rolled coils are used for heavy gauge applications or further processed and cold reduced into lighter gauges. Depending upon the chemistry and hot rolling parameters the cold reduced products are further processed using batch annealing or continuously annealing technologies. Batch annealed products are available uncoated (bare) or electrogalvanized (EG). Continuously annealed products are available as bare, electrogalvanized, hot-dip-galvanized (HDGI) or hot-dip-galvannealed
(HDGA).
Typical Mechanical Properties of Commercial Steels
Coating
Chemistry
C 0.10% max, ultra-low carbon steels may be applied
C 0.02-0.15%, hence prohibits the use of ultra-low carbon
For chemistries which exceed the above three grades, Typically C > 0.15% or Mn > 0.60
Product
Yield Strength
(MPa)
Bare CS
1
CS
2
186
Bare 245
HDGI CS
2
250
HDGA CS
2
1
Batch Annealed Product
2
Continuously Annealed Product
3
The strain range for n-value is 10-20%
285
Tensile
Strength
(MPa)
317
356
360
360
Total
Elongation
(%)
44
39
36
40
R-bar
1.2
1.0
1.0
0.9 n
3
0.19
0.19
0.19
0.20
Note: Information contained in this document is subject to change. Please contact our sales team whenever you place an order to ensure that your requirements are fully met. Please contact us if you have a specific requirement that is not included in the range of products and services covered by this document.
Update: August 2009
3

Representative Stress-Strain Curve
Stress-Strain curve data is available upon request
Fatigue
Strain Life Parameters for Commercial Steels
Fatigue Strength Coefficient (MPa)
Fatigue Ductility Coefficient
Fatigue Strength Exponent
Fatigue Ductility Exponent
Cyclic Strength Coefficient (MPa)
Cyclic Strain Hardening Exponent
Endurance Limit, 5 x 10
6
cycles (MPa)
1067
0.384
-0.145
-0.531
885
0.198
159
Note: Information contained in this document is subject to change. Please contact our sales team whenever you place an order to ensure that your requirements are fully met. Please contact us if you have a specific requirement that is not included in the range of products and services covered by this document.
Update: August 2009
4

Strain Life Curve for Commercial Steels
Grade Availability - ArcelorMittal Products
Hot Rolled
Uncoated Uncoated
DSA DSA
DSB
EG: Electrogalvanized
HDGI: Hot-Dip-Galvanalized
HDGA: Hot-Dip-Galvannealed
DSB
EG
DSA
DSB
Cold Rolled
HDGI
-
FSB
ArcelorMittal offers several grades of Drawing and Forming Steels with various coating conditions.
Application
Exhibits formability suitable to fabricate parts that are subject to severe drawing during processing
Chemistry
DS/FS Type A
DS/FS Type B
Product Chemistry
C 0.10% max, ultra-low carbon steels may be applied
C 0.02-0.15%, hence prohibits the use of ultra-low carbon
HDGA
-
FSB
Note: Information contained in this document is subject to change. Please contact our sales team whenever you place an order to ensure that your requirements are fully met. Please contact us if you have a specific requirement that is not included in the range of products and services covered by this document.
Update: August 2009
5

Processing
Depending on the application, Drawing / Forming Steels are produced using vacuum degassed ultra-low-carbon or regular low-carbon compositions. Steels are then cast into slabs and hot rolled. Hot rolled coils are used for heavy gauge applications or further processed and cold reduced into lighter gauges. The cold reduced products is then further processed using batch annealing or continuously annealing technologies. Batch annealed products are available uncoated (bare) or electrogalvainized (EG). Continuously annealed products are available as bare, electrogalvanized, hot-dip-galvanized (HDGI) or hot-dip-galvannealed (HDGA).
Typical Microstructure of Drawing / Forming Steel
Drawing Steel containing 100% ferrite. Magnification: 500X
Note: Information contained in this document is subject to change. Please contact our sales team whenever you place an order to ensure that your requirements are fully met. Please contact us if you have a specific requirement that is not included in the range of products and services covered by this document.
Update: August 2009
6

Typical Mechanical Properties of Drawing / Forming Steels
Coating Product
Yield Strength
(MPa)
Tensile
Strength
(MPa)
Total
Elongation
(%) r-bar
Bare/EG DS
1
172 310 46 1.74
Bare/EG DS
2
FS
2
192 326 44 1.56
HDGI 225 346 41 1.42
HDGA FS
2
220 335 42
J
1
Batch Annealed Product
2
Continuously Annealed Product
3
The strain range for n-value is 10-20%
J
JIS test. All others ASTM tests
Representative Stress-Strain Curves for Drawing / Forming Steels
1.29 n
3
0.21
0.20
0.21
0.20
Stress-Strain curve data is available upon request
Aging
DS / FS grades are free of aging for at least six (6) months
Note: Information contained in this document is subject to change. Please contact our sales team whenever you place an order to ensure that your requirements are fully met. Please contact us if you have a specific requirement that is not included in the range of products and services covered by this document.
Update: August 2009
7

Formability
Angular Stretch Bend Test Results for Drawing / Forming Steels
Sheared Edge Stretching Test Results for for Drawing / Forming Steels
Product
CR-DS
CR-DS
Gauge
(mm)
0.77
1.19
Average
Hole Expansion
(%)
145.1
152.1
Fatigue
Strain Life Parameters of Drawing / Forming Steels
Fatigue Strength Coefficient (MPa)
Fatigue Ductility Coefficient
Fatigue Strength Exponent
Fatigue Ductility Exponent
Cyclic Strength Coefficient (MPa)
Cyclic Strain Hardening Exponent
Endurance Limit, 5 x 10
6
cycles (MPa)
796
0.425
-0.129
-0.513
716
0.207
138
Note: Information contained in this document is subject to change. Please contact our sales team whenever you place an order to ensure that your requirements are fully met. Please contact us if you have a specific requirement that is not included in the range of products and services covered by this document.
Update: August 2009
8