ASTM A249/A249M S31703 Introduce
ASTM A249/A249M S31703 steel is an austenitic stainless steel specifically designed for use in boiler, superheater, and heat exchanger tubes. Its high chromium and nickel content make it highly resistant to corrosion and oxidation, and its high strength-to-weight ratio makes it suitable for a range of applications. Furthermore, the steel offers improved heat resistance and good weldability, making it ideal for operations involving higher temperatures.
Smelting temperature:1171°C - 1981°C
Application:Welded austenitic steel tubes for boilers, superheaters, heat exchangers and condensers
ASTM A249/A249M S31703 Material Chemical Composition
The chemical composition of the ASTM A249/A249M S31703 steel are as follows:
| Element | Min | Max |
|---|---|---|
| Silicon (Si) | - | 1.0000 |
| Sulfur (S) | - | 0.0300 |
| PhOsphorus (P) | - | 0.0450 |
| Nickel (Ni) | 11.0000 | 15.0000 |
| Molybdenum (Mo) | 3.0000 | 4.0000 |
| Manganese (Mn) | - | 2.0000 |
| Chromium (Cr) | 18.0000 | 20.0000 |
| Carbon (C) | - | 0.0300 |
ASTM A249/A249M S31703 Material Mechanical Properties
Elongation is a measure of the amount of elasticity that a material has when it reaches its yield strength. The elongation of ASTM A249/A249M S31703 steel ranges from 16% to 36%. The higher the elongation, the more elasticity and flexibility the steel has, allowing it to undergo greater loading before reaching its permanent deformation point.
The mechanical properties of the ASTM A249/A249M S31703 steel are as follows:
| YieldRp0.2 | ≤ 588 (MPa) |
| TeileRm | ≤ 799 (MPa) |
| ImpactKV/Ku | 21(J) |
| ElongationA | 11% |
| Reduction in cross section on fractureZ | 33% |
| As-Heat-Treated Condition | Solution and Aging, Annealing, Ausaging, Q+T,etc |
| Brinell hardness (HBW) | 421 |
ASTM A249/A249M S31703 Material Thermal Properties
The thermal performance parameters of the ASTM A249/A249M S31703 steel are as follows:
| Temperature (°C) | 12 | 575 | 962 |
| Modulus of elasticity (GPa) | - | 339 | - |
| Mean coefficient of thermal expaion ×10-6/(°C) | - | - | 11 |
| Thermal conductivity (W/m·°C) | - | 22.3 | 42.2 |
| Specific thermal capacity (J/kg·°C) | - | 434 | - |
| Specific electrical resistivity (Ω mm²/m) | 0.34 | - | - |
| Deity (kg/dm³) | - | - | 111 |
| Poisson’s coefficient, ν | - | - | 242 |
ASTM A249/A249M S31703 Material Machining Technology
Machinability is a measure of how easily a material can be cut, drilled, or finished using machine tools. ASTM A249/A249M S31703 steel has a high machinability rating and can be easily cut, drilled, or finished using machine tools.