Compare / SD345 vs SD390
SD345 vs SD390
JIS G 3112 · Steel
Japanese deformed bar: yield 345–440 MPa, tensile ≥ 490 MPa, yield ratio ≤ 80 %.
JIS G 3112 · Steel
Japanese deformed bar: yield 390–510 MPa, tensile ≥ 560 MPa, yield ratio ≤ 80 %.
Mechanical
| Property | Condition | SD345 | SD390 | Difference |
|---|---|---|---|---|
| Yield strength ReH | — | 345–440MPa1 | 390–510MPa1 | +13 % |
| Tensile strength Rm | — | ≥ 490MPa1 | ≥ 560MPa1 | +14 % |
| Elongation after fracture A | test piece similar to No. 2 | ≥ 18%1 | ≥ 16%1 | −11 % |
| Yield-to-tensile ratio Fy/Fu | — | ≤ 0.81 | ≤ 0.81 | same |
Rows are matched by condition (thickness band, temperature, product form). A dash means the grade has no sourced value for that condition. Differences are SD390 relative to SD345; for ranges the lower bound is compared.