ASTM A709/A709M A709 Grade 690W Type Q Introduce
The {stnadard} specification provides a minimum yield of 46,000 psi (320MPa) and a minimum tensile strength of 65,000 psi (450MPa) for the corresponding 690W Type Q grade. For a thickness up to 3.5" (89mm), the impact requirements can be met at room temperature.
Smelting temperature:1494°C - 1628°C
Application:Structural steel for bridge
ASTM A709/A709M A709 Grade 690W Type Q Material Chemical Composition
The chemical composition of the ASTM A709/A709M A709 Grade 690W Type Q steel are as follows:
| Element | Min | Max |
|---|---|---|
| Vanadium (V) | 0.0300 | 0.0800 |
| Molybdenum (Mo) | 0.4000 | 0.6000 |
| Nickel (Ni) | 1.2000 | 1.5000 |
| Chromium (Cr) | 1.0000 | 1.5000 |
| PhOsphorus (P) | - | 0.0350 |
| Sulfur (S) | - | 0.0350 |
| Manganese (Mn) | 0.9500 | 1.3000 |
| Silicon (Si) | 0.1500 | 0.3500 |
| Carbon (C) | 0.1400 | 0.2100 |
ASTM A709/A709M A709 Grade 690W Type Q Material Mechanical Properties
Hardness is a measure of the resistance to abrasion, scratch, or penetration. ASTM A709/A709M A709 Grade 690W Type Q steel has excellent hardness, with a Brinell hardness ranging from 170HB to 365HB, depending on the grade. This allows the steel to withstand heavy wear and tear without losing strength or shape.
The mechanical properties of the ASTM A709/A709M A709 Grade 690W Type Q steel are as follows:
| YieldRp0.2 | ≤ 437 (MPa) |
| TeileRm | ≤ 687 (MPa) |
| ImpactKV/Ku | 12(J) |
| ElongationA | 43% |
| Reduction in cross section on fractureZ | 24% |
| As-Heat-Treated Condition | Solution and Aging, Annealing, Ausaging, Q+T,etc |
| Brinell hardness (HBW) | 442 |
ASTM A709/A709M A709 Grade 690W Type Q Material Thermal Properties
The thermal performance parameters of the ASTM A709/A709M A709 Grade 690W Type Q steel are as follows:
| Temperature (°C) | 23 | 677 | 366 |
| Modulus of elasticity (GPa) | - | 728 | - |
| Mean coefficient of thermal expaion ×10-6/(°C) | - | - | 21 |
| Thermal conductivity (W/m·°C) | - | 32.3 | 21.2 |
| Specific thermal capacity (J/kg·°C) | - | 134 | - |
| Specific electrical resistivity (Ω mm²/m) | 0.41 | - | - |
| Deity (kg/dm³) | - | - | 422 |
| Poisson’s coefficient, ν | - | - | 113 |