ASTM Steel Grades
Common American (US) Steel Grades as per ASTM include grades 36, 32, 50, 55, 60, 65 and 70 for open sections (I Beams, T beam, Channels), which correspond to the yield strength of the steel in ksi (kilopounds per square inch). For closed sections (hollow sections), grades are presented in A, B, and C with Yield Strengths provided.
Ultimate Strengths are also available for all grades. Gravities have been converted to metric units as well (MPa).
ASTM Steel Grade Designations
| Grade | Section Types | Fy (ksi) | Fy (MPa) | Fu (ksi) | Fu (MPa) |
|---|---|---|---|---|---|
| 36 | Open Sections | 36 | 248 | 58 | 400 |
| 42 | Open Sections | 42 | 290 | 60 | 414 |
| 50 | Open Sections | 50 | 345 | 65 | 448 |
| 55 | Open Sections | 55 | 379 | 70 | 483 |
| 60 | Open Sections | 60 | 414 | 75 | 517 |
| 65 | Open Sections | 65 | 448 | 80 | 552 |
| 70 | Open Sections | 70 | 483 | 90 | 621 |
| A | Circular Section, Rectangular Tube, Square Tube | 36 | 248 | 58 | 400 |
| B | Circular Section, Rectangular Tube, Square Tube | 42 | 290 | 58 | 400 |
| C | Circular Section, Rectangular Tube, Square Tube | 46 | 317 | 62 | 427 |