ASTM A314 Grade 309 Introduce
ASTM A314 Grade 309 is a type of stainless steel that is commonly used for making piping systems, tubes, and plates for use in liquid service applications. It is an austenitic stainless steel grade which provides good welding properties and is easilycorroded and formed. Additionally, the grade is also resistant to oxidation and scaling, as well as possessing good strength and hardness properties. ASTM A314 Grade 309 is a non-magnetic steel that can be heat treated for better formability and strength. It may also be cold worked, annealed, and polished to achieve a desired workability. The grade is also readily machinable and can be cut, drilled, and stamped easily. It can also be arc welded with a suitable filler material for applications that require high strength and toughness.
Smelting temperature:1346°C - 1778°C
Application:Specification for stainless steel and steel rods for forging and heat
ASTM A314 Grade 309 Material Chemical Composition
The chemical composition of the ASTM A314 Grade 309 steel are as follows:
| Element | Min | Max |
|---|---|---|
| Silicon (Si) | - | 1.0000 |
| Sulfur (S) | - | 0.0300 |
| PhOsphorus (P) | - | 0.0450 |
| Nickel (Ni) | 12.0000 | 15.0000 |
| Manganese (Mn) | - | 2.0000 |
| Chromium (Cr) | 22.0000 | 24.0000 |
| Carbon (C) | - | 0.2000 |
ASTM A314 Grade 309 Material Mechanical Properties
The mechanical properties of the ASTM A314 Grade 309 steel are as follows:
| YieldRp0.2 | ≤ 259 (MPa) |
| TeileRm | ≤ 358 (MPa) |
| ImpactKV/Ku | 43(J) |
| ElongationA | 31% |
| Reduction in cross section on fractureZ | 13% |
| As-Heat-Treated Condition | Solution and Aging, Annealing, Ausaging, Q+T,etc |
| Brinell hardness (HBW) | 413 |
ASTM A314 Grade 309 Material Thermal Properties
The thermal performance parameters of the ASTM A314 Grade 309 steel are as follows:
| Temperature (°C) | 34 | 534 | 627 |
| Modulus of elasticity (GPa) | - | 297 | - |
| Mean coefficient of thermal expaion ×10-6/(°C) | - | - | 14 |
| Thermal conductivity (W/m·°C) | - | 22.3 | 31.2 |
| Specific thermal capacity (J/kg·°C) | - | 212 | - |
| Specific electrical resistivity (Ω mm²/m) | 0.24 | - | - |
| Deity (kg/dm³) | - | - | 442 |
| Poisson’s coefficient, ν | - | - | 242 |