ASTM A709/A709M Grade 345W Type B Introduce
ASTM A709/A709M Grade 345W Type B steel is a high-strength, low-alloy structural steel made to the specification ASTM A709/A709M. It is designed to provide superior corrosion resistance and enhanced strength at elevated temperatures, making it suitable for use in construction applications and other applications where corrosion resistance and strength are required. The steel is available in a variety of grades and shapes to meet the needs of many different applications.
Smelting temperature:1647°C - 1729°C
Application:Structural steel for bridge
ASTM A709/A709M Grade 345W Type B Material Chemical Composition
The chemical composition of the ASTM A709/A709M Grade 345W Type B steel are as follows:
| Element | Min | Max |
|---|---|---|
| Copper (Cu) | 0.2000 | 0.4000 |
| Vanadium (V) | 0.0100 | 0.1000 |
| Nickel (Ni) | - | 0.5000 |
| Chromium (Cr) | 0.4000 | 0.7000 |
| PhOsphorus (P) | - | 0.0400 |
| Sulfur (S) | - | 0.0500 |
| Manganese (Mn) | 0.7500 | 1.3500 |
| Silicon (Si) | 0.1500 | 0.5000 |
| Carbon (C) | - | 0.2000 |
| Manganese (Mn) | 0.7500 | 1.3500 |
ASTM A709/A709M Grade 345W Type B Material Mechanical Properties
ASTM A709/A709M Grade 345W Type B steel is a highly engineered, low-alloy structural steel commonly used in modern engineering applications due to its exceptional combination of mechanical properties that make it an ideal choice for creating structures that need to be strong, durable, and yet lightweight. The steel is part of a family of steels known as ASTM A709/A709M Grade 345W Type B, and is produced in a variety of grades with different chemical compositions, mechanical properties, and physical characteristics.
The mechanical properties of the ASTM A709/A709M Grade 345W Type B steel are as follows:
| YieldRp0.2 | ≤ 852 (MPa) |
| TeileRm | ≤ 465 (MPa) |
| ImpactKV/Ku | 44(J) |
| ElongationA | 42% |
| Reduction in cross section on fractureZ | 14% |
| As-Heat-Treated Condition | Solution and Aging, Annealing, Ausaging, Q+T,etc |
| Brinell hardness (HBW) | 421 |
ASTM A709/A709M Grade 345W Type B Material Thermal Properties
The thermal performance parameters of the ASTM A709/A709M Grade 345W Type B steel are as follows:
| Temperature (°C) | 14 | 114 | 174 |
| Modulus of elasticity (GPa) | - | 762 | - |
| Mean coefficient of thermal expaion ×10-6/(°C) | - | - | 33 |
| Thermal conductivity (W/m·°C) | - | 44.3 | 41.2 |
| Specific thermal capacity (J/kg·°C) | - | 321 | - |
| Specific electrical resistivity (Ω mm²/m) | 0.12 | - | - |
| Deity (kg/dm³) | - | - | 212 |
| Poisson’s coefficient, ν | - | - | 411 |