ASTM A709 Grade 50W vs ASTM A709 HPS 100W
Property comparison of ASTM A709 Grade 50W and ASTM A709 HPS 100W, both carbon steel.
| Property | ASTM A709 Grade 50W | ASTM A709 HPS 100W | Difference |
|---|---|---|---|
| Yield strength | 345 MPa | 690 MPa | +100% |
| Tensile strength | 485 MPa | 760 MPa | +57% |
| Elongation | 19 % | 18 % | -5% |
| Elastic modulus | 200,000 MPa | 200,000 MPa | 0% |
| Shear modulus | 77,000 MPa | 77,000 MPa | 0% |
| Poisson ratio | 0.3 | 0.3 | 0% |
| Density | 7,850 kg/m³ | 7,850 kg/m³ | 0% |
| Thermal conductivity | 64.3 W/m·K | 64.3 W/m·K | 0% |
| Specific heat | 458 J/kg·K | 458 J/kg·K | 0% |
| Coefficient of thermal expansion | 0.000012 1/K | 0.000012 1/K | 0% |
Difference is ASTM A709 HPS 100W relative to ASTM A709 Grade 50W. Values are taken from the representative row of each material; both materials may have multiple heat treatments or conditions on their individual pages.
Identification
- grade
- Grade 50W [345W]
- standard
- ASTM A709/A709M
- heat treatment
- As-rolled
- grade
- HPS 100W [HPS 690W]
- standard
- ASTM A709/A709M
- heat treatment
- Quenched and tempered
About ASTM A709 bridge steel
A709 is the dedicated structural steel specification for bridges, with grade designations matching AASHTO requirements. Grade 50 covers most girders and stringers; HPS 70W and HPS 100W are high-performance weathering grades for long-span and severe-environment bridges.
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