Under ASTM A204/ A204M standard specification, there are 3 steel grades: A204 Gr A, A204 Gr B, A204 Gr C. Among them, ASTM A204 Gr B steel is most widely used and it is equivalent to EN10028-2 16Mo3 steel.
ASTM A204 Gr B steel Chemical Composition:
| Grade | C | Si | Mn | P | S | Mo |
| ASTM A204 Gr B | 0.20-0.27 | 0.13-0.45 | 0.90-0.98 | 0.035 | 0.035 | 0.45–0.60 |
ASTM A204 Gr B steel Mechanical Property:
| Grade | ASTM A204 Gr B |
| Tensile strength, kis [MPa] | 70-90 [485-620] |
| Yield strength, min, kis [MPa] | 40 [275] |
| Elongation in 8 in. [200 mm], min, % | 17 |
| Elongation in 2 in. [50 mm], min, % | 21 |
ASTM A204 Gr B steel equivalent grades:
DIN17155: 15Mo3
EN10028-2: 16Mo3
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