ASTM A656 Grade 70 is a high-strength, low-alloy structural steel with the following properties:
| Property | Value |
|---|---|
| Yield Strength (min) | 485 MPa (70 ksi) |
| Tensile Strength (min) | 550 MPa (80 ksi) |
| Elongation in 2″ (min) | 17% |
| Elongation in 8″ (min) | 14% |
ASTM A656 Grade 70 steel is commonly used in:
ASTM A656 Grade 70 is typically produced through controlled rolling or thermo-mechanical controlled processing. Available dimensions include:
| Product Type | Thickness (in/mm) | Width (in/mm) | Length (in/mm) |
|---|---|---|---|
| Mill Plate | 0.437 – 1.00 / 11.1 – 25.4 | 72 – 120 / 1800 – 3050 | 120 – 1020 / 3050 – 25910 |
| Temper Leveled Plate | 0.100 – 0.50 / 2.54 – 13 | 48 – 96 / 1200 – 2400 | 72 – 720 / 1800 – 18300 |
ASTM A656 Grade 70 can be welded using common fusion and resistance methods. However, oxyacetylene welding is not recommended. Proper welding procedures should be followed to maintain the steel’s high-strength properties.
| Grade | Yield Strength (min ksi) | Tensile Strength (min ksi) | Elongation in 2″ (min %) |
|---|---|---|---|
| Grade 50 | 50 | 60 | 23 |
| Grade 60 | 60 | 70 | 20 |
| Grade 70 | 70 | 80 | 17 |
| Grade 80 | 80 | 90 | 15 |
While ASTM A656 Grade 70 may have a higher initial cost compared to standard structural steels, its high strength-to-weight ratio allows for thinner sections, leading to potential savings in material costs, transportation, and installation.
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