ASTM A709/A709M Grade 690W Type H Introduce
ASTM A709/A709M Grade 690W Type H steel is produced to meet a variety of specifications, including the ASTM A709/A709M specification, which is the most commonly used specification for structural steel. The ASTM A709/A709M specification covers high-strength, low-alloy structural steel sections, plates, bars, and shapes with improved atmospheric corrosion resistance that provide an economic solution to many structural and fabrication needs. The grade and type should be specified as well as the tensile strength, yield strength, elongation, impact resistance, and notch toughness requirements.
Smelting temperature:1425°C - 1655°C
Application:Structural steel for bridge
ASTM A709/A709M Grade 690W Type H Material Chemical Composition
The chemical composition of the ASTM A709/A709M Grade 690W Type H steel are as follows:
| Element | Min | Max |
|---|---|---|
| Boron (B) | 0.0005 | 0.0050 |
| Vanadium (V) | 0.0300 | 0.0800 |
| Molybdenum (Mo) | 0.2000 | 0.3000 |
| Nickel (Ni) | 0.3000 | 0.7000 |
| Chromium (Cr) | 0.4000 | 0.6500 |
| PhOsphorus (P) | - | 0.0350 |
| Sulfur (S) | - | 0.0350 |
| Manganese (Mn) | 0.9500 | 1.3000 |
| Silicon (Si) | 0.2000 | 0.3500 |
| Carbon (C) | 0.1200 | 0.2100 |
ASTM A709/A709M Grade 690W Type H 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 Grade 690W Type H 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 Grade 690W Type H steel are as follows:
| YieldRp0.2 | ≤ 742 (MPa) |
| TeileRm | ≤ 935 (MPa) |
| ImpactKV/Ku | 21(J) |
| ElongationA | 22% |
| Reduction in cross section on fractureZ | 43% |
| As-Heat-Treated Condition | Solution and Aging, Annealing, Ausaging, Q+T,etc |
| Brinell hardness (HBW) | 442 |
ASTM A709/A709M Grade 690W Type H Material Thermal Properties
The thermal performance parameters of the ASTM A709/A709M Grade 690W Type H steel are as follows:
| Temperature (°C) | 12 | 645 | 547 |
| Modulus of elasticity (GPa) | - | 485 | - |
| Mean coefficient of thermal expaion ×10-6/(°C) | - | - | 43 |
| Thermal conductivity (W/m·°C) | - | 24.3 | 14.2 |
| Specific thermal capacity (J/kg·°C) | - | 423 | - |
| Specific electrical resistivity (Ω mm²/m) | 0.21 | - | - |
| Deity (kg/dm³) | - | - | 433 |
| Poisson’s coefficient, ν | - | - | 323 |