ASTM A573 / A573M
This specification covers structural quality carbonmanganese-silicon steel plates in three tensile strength ranges intended primarily for service at atmospheric temperatures where improved notch toughness is important.Plates covered by this specification are limited to a maximum thickness of 1.5 in. [40 mm].If the steel is to be welded, it is presupposed that a welding procedure suitable for the grade of steel and intended use or service will be utilized.
| Grades | Description |
|---|---|
| Grade 58 | - |
| Grade 65 | - |
| Grade 70 | - |
Chemical Properties
| Grade | Carbon | Manganese | Phosphorus,max | Sulfur,max | Silicon | |
|---|---|---|---|---|---|---|
| 1⁄2 in. [13 mm] and under | Over 1⁄2 in. [13 mm] to 11⁄2 in.,[40 mm], incl | |||||
| Grade 58 [400] | 0.23 | 0.23 | 0.60–0.90 | 0.030 | 0.030 | 0.10–0.35 |
| Grade 65 [450] | 0.24 | 0.26 | 0.85–1.20 | 0.030 | 0.030 | 0.15–0.40 |
| Grade 70 [485] | 0.27 | 0.28 | 0.85–1.20 | 0.030 | 0.030 | 0.15–0.40 |
Note: A For each reduction of 0.01 percentage point below the specified maximum for carbon, an increase of 0.06 percentage points above the specified maximum for manganese is permitted, up to a maximum of 1.50 % for Grades 58 and 65; and up to a maximum of 1.60 % for Grade 70.
Mechanical Properties
| Grades |
Tensile strength,min: ksi [MPa] |
Yield strength,min: ksi [MPa] |
Elongation in 8 in. [200 mm] minB,C , % |
Elongation in 2 in. [50 mm], minB,C , % |
|---|---|---|---|---|
| Grade 58 [400] | 58–71 [400–490] |
32 [220] |
21 | 24 |
| Grade 65 [450] | 65–77 [450–530] |
35 [240] |
20 | 23 |
| Grade 70 [485] | 70–90 [485–620] | 42 [290] | 18 | 21 |
