ASTM A709/A709M A709 Grade 345W Type A Introduce
The ASTM A709/A709M steel standard was first issued in 1965 as A709-65 and has since undergone several revisions. The latest version is the 2020 edition, which replaced the A709-13 specification from 2013. The 2020 edition was released earlier in the year in response to the Coronavirus pandemic, and is designed to help ensure that the quality and safety of construction materials remains high, despite the accelerating shift towards automated production.
Smelting temperature:1174°C - 1589°C
Application:Structural steel for bridge
ASTM A709/A709M A709 Grade 345W Type A Material Chemical Composition
The chemical composition of the ASTM A709/A709M A709 Grade 345W Type A steel are as follows:
| Element | Min | Max |
|---|---|---|
| Copper (Cu) | 0.2500 | 0.4000 |
| Vanadium (V) | 0.0200 | 0.1000 |
| Nickel (Ni) | - | 0.4000 |
| Chromium (Cr) | 0.4000 | 0.6500 |
| PhOsphorus (P) | - | 0.0400 |
| Sulfur (S) | - | 0.0200 |
| Manganese (Mn) | 0.8000 | 1.2500 |
| Silicon (Si) | 0.3000 | 0.6500 |
| Carbon (C) | - | 0.1900 |
ASTM A709/A709M A709 Grade 345W Type A Material Mechanical Properties
Elasticity is a measure of an object's ability to return to its original shape after being subjected to a load. ASTM A709/A709M A709 Grade 345W Type A steel is highly elastic, with an elastic modulus ranging from 190GPa to 300GPa. This allows the steel to be compressed or twisted without permanently deforming, allowing it to return to its original shape when the load is removed.
The mechanical properties of the ASTM A709/A709M A709 Grade 345W Type A steel are as follows:
| YieldRp0.2 | ≤ 333 (MPa) |
| TeileRm | ≤ 544 (MPa) |
| ImpactKV/Ku | 31(J) |
| ElongationA | 22% |
| Reduction in cross section on fractureZ | 11% |
| As-Heat-Treated Condition | Solution and Aging, Annealing, Ausaging, Q+T,etc |
| Brinell hardness (HBW) | 332 |
ASTM A709/A709M A709 Grade 345W Type A Material Thermal Properties
The thermal performance parameters of the ASTM A709/A709M A709 Grade 345W Type A steel are as follows:
| Temperature (°C) | 22 | 655 | 332 |
| Modulus of elasticity (GPa) | - | 471 | - |
| Mean coefficient of thermal expaion ×10-6/(°C) | - | - | 24 |
| Thermal conductivity (W/m·°C) | - | 32.3 | 41.2 |
| Specific thermal capacity (J/kg·°C) | - | 342 | - |
| Specific electrical resistivity (Ω mm²/m) | 0.23 | - | - |
| Deity (kg/dm³) | - | - | 244 |
| Poisson’s coefficient, ν | - | - | 434 |