ASME SA-249/SA-249M N08904 Introduce
ASME SA-249/SA-249M N08904 is a specification for austenitic stainless steel welded and seamless tubes. It is one of the most commonly used materials in the manufacture of boilers and other forms of heat transfer equipment due to its excellent thermal properties. It is one of the most widely used varieties of stainless steel and is highly resistant to corrosion, making it one of the most popular choices for boilers, heat exchangers and condensers. It has a low thermal conductivity and a low thermal expansion coefficient and is therefore an excellent choice for heat transfer applications where low thermal conductivity is required.
Smelting temperature:1647°C - 1616°C
Application:Welded austenitic steel tubes for boilers, superheaters, heat exchangers and condensers
ASME SA-249/SA-249M N08904 Material Mechanical Properties
The mechanical properties of the ASME SA-249/SA-249M N08904 steel are as follows:
| YieldRp0.2 | ≤ 936 (MPa) |
| TeileRm | ≤ 196 (MPa) |
| ImpactKV/Ku | 44(J) |
| ElongationA | 23% |
| Reduction in cross section on fractureZ | 23% |
| As-Heat-Treated Condition | Solution and Aging, Annealing, Ausaging, Q+T,etc |
| Brinell hardness (HBW) | 444 |
ASME SA-249/SA-249M N08904 Material Thermal Properties
The thermal performance parameters of the ASME SA-249/SA-249M N08904 steel are as follows:
| Temperature (°C) | 22 | 948 | 199 |
| Modulus of elasticity (GPa) | - | 129 | - |
| Mean coefficient of thermal expaion ×10-6/(°C) | - | - | 41 |
| Thermal conductivity (W/m·°C) | - | 24.3 | 44.2 |
| Specific thermal capacity (J/kg·°C) | - | 322 | - |
| Specific electrical resistivity (Ω mm²/m) | 0.24 | - | - |
| Deity (kg/dm³) | - | - | 143 |
| Poisson’s coefficient, ν | - | - | 434 |