Description
ASTM A1008 / A1008M
ASTM A1008 is a standard specification produced by ASTM International for cold-rolled, carbon, structural, and high-strength low-alloy with improved formability steel sheet. It’s widely used in applications like automotive components, appliances, and construction materials due to its versatility, strength, and formability.
Key Properties
- Smooth and clean surface finish due to cold rolling
- Excellent dimensional accuracy and tight thickness tolerance
- Good formability – suitable for bending, drawing, and stamping
- Available in a wide range of strength levels (CS to UHSS)
- Consistent mechanical and surface quality
- Good weldability for most grades
- Ideal for applications requiring surface appearance
- Not corrosion-resistant – usually coated or painted for protection
ASTM A1008 grades
1. Commercial Steel (CS)
- CS Type A
- CS Type B (most commonly used)
- CS Type C
2. Drawing Steel (DS)
- DS Type A
- DS Type B
3. Structural Steel (SS) Grades
- SS Grade 30
- SS Grade 33
- SS Grade 36
- SS Grade 40
- SS Grade 45
4. High-Strength Low-Alloy Steel (HSLAS)
- HSLAS Grades 45, 50, 55, 60, 70, 80
5. High-Strength Low-Alloy Steel with Improved Formability (HSLAS-F)
- HSLAS-F Grades 50, 55, 60
ASTM A1008 Chemical Composition
| Grade | C (max) | Mn (max) | P (max) | S (max) |
|---|---|---|---|---|
| CS Type B | 0.02–0.15 | 0.60 | 0.030 | 0.035 |
| DS Type B | ≤ 0.06 | ≤ 0.50 | 0.030 | 0.035 |
| SS Grade 36 | 0.08–0.20 | 0.60–1.00 | 0.030 | 0.035 |
| HSLAS Grade 50 | ≤ 0.12 | ≤ 1.60 | 0.030 | 0.035 |
ASTM A1008 Mechanical Properties
| Grade | Yield Strength (MPa) | Tensile Strength (MPa) | Elongation (%) (50 mm gauge) |
|---|---|---|---|
| CS Type B | ≥ 170 | ≥ 270 | 28–40% (depending on thickness) |
| DS Type B | ≥ 140 | ≥ 270 | 30–42% |
| SS Grade 36 | ≥ 250 | ≥ 360 | 20–28% |
| HSLAS Grade 50 | ≥ 345 | ≥ 450 | ≥ 22% |
Applications
- Automotive panels
- Home appliances
- Furniture
- Construction components
- Electrical panels
- Tubing and general fabrication
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