ASTM A709 Grade 100 steel specification for Structural Steel for Bridges.
ASTM A709 Grade 100 steel is carbon and high-strength low-alloy steel structural shapes, plates, and bars and quenched and tempered alloy steel.
ASTM A709 Grade 100 material chemical composition
| Grade | C | Mn | P max | S max | Si | Cr |
| Grade 100 | 0.15-0.21 | 0.80-1.10 | 0.035 | 0.035 | 0.40-0.80 | 0.50-0.80 |
ASTM A709 Grade 100 structural steel mechanical properties
| Grade | Steel plate thickness,mm | Section steel thickness,mm | Yield strength [mpa] | Tensile strength [mpa] | Elongation min % | |||
| Steel plate | Section steel | |||||||
| 8in[200mm] | 2in[50mm] | 8in[200mm] | 2in[50mm] | |||||
| 100 | ≤65 | ... | [690]min | 760-895 | ... | 18 | ... | ... |
| 65-100 | [620]min | 690-895 | ... | 16 | ... | ... | ||
When the ASTM A709 Grade 100 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. See Appendix X3 of Specification A 6/A 6M for information on weldability.
A6/A6M Specification for General Requirements for Rolled Structural Steel Bars, Plates, Shapes, and Sheet Piling
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