ASTM A709/A709M Grade 690 Type P Introduce
ASTM A709/A709M Grade 690 Type P steel is a hot-rolled steel plate designed for enhanced corrosion resistance in certain applications. It has a higher corrosion resistance than conventional carbon steel, making it well suited for use in arduous conditions such as those encountered in outdoor storage tanks, roadside barriers, and marine applications. ASTM A709/A709M Grade 690 Type P is available in several grades, each with unique chemical properties.
Smelting temperature:1966°C - 1664°C
Application:Structural steel for bridge
ASTM A709/A709M Grade 690 Type P Material Chemical Composition
The chemical composition of the ASTM A709/A709M Grade 690 Type P steel are as follows:
| Element | Min | Max |
|---|---|---|
| Boron (B) | 0.0010 | 0.0050 |
| Molybdenum (Mo) | 0.4500 | 0.6000 |
| Nickel (Ni) | 1.2000 | 1.5000 |
| Chromium (Cr) | 0.8500 | 1.2000 |
| PhOsphorus (P) | - | 0.0350 |
| Sulfur (S) | - | 0.0350 |
| Manganese (Mn) | 0.4500 | 0.7000 |
| Silicon (Si) | 0.2000 | 0.3500 |
| Carbon (C) | 0.1200 | 0.2100 |
ASTM A709/A709M Grade 690 Type P Material Mechanical Properties
Hardness is a measure of the resistance to abrasion, scratch, or penetration. ASTM A709/A709M Grade 690 Type P 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 Grade 690 Type P steel are as follows:
| YieldRp0.2 | ≤ 861 (MPa) |
| TeileRm | ≤ 151 (MPa) |
| ImpactKV/Ku | 31(J) |
| ElongationA | 34% |
| Reduction in cross section on fractureZ | 14% |
| As-Heat-Treated Condition | Solution and Aging, Annealing, Ausaging, Q+T,etc |
| Brinell hardness (HBW) | 442 |
ASTM A709/A709M Grade 690 Type P Material Thermal Properties
The thermal performance parameters of the ASTM A709/A709M Grade 690 Type P steel are as follows:
| Temperature (°C) | 34 | 731 | 146 |
| Modulus of elasticity (GPa) | - | 236 | - |
| Mean coefficient of thermal expaion ×10-6/(°C) | - | - | 22 |
| Thermal conductivity (W/m·°C) | - | 21.3 | 12.2 |
| Specific thermal capacity (J/kg·°C) | - | 413 | - |
| Specific electrical resistivity (Ω mm²/m) | 0.34 | - | - |
| Deity (kg/dm³) | - | - | 421 |
| Poisson’s coefficient, ν | - | - | 213 |