ASTM A249/A249M Type 348 Introduce
ASTM A249/A249M Type 348 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:1112°C - 1719°C
Application:Welded austenitic steel tubes for boilers, superheaters, heat exchangers and condensers
ASTM A249/A249M Type 348 Material Mechanical Properties
ASTM A249/A249M Type 348 is suitable for use in applications that require the weldability and corrosion resistance of stainless steel. The various grades of steel covered in this specification are chosen to best suit the application and climate in which they are used. Tubes meeting ASTM A249/A249M standards will ensure high quality, accurate dimensions and good mechanical properties that meet the requirements of the specified application.
The mechanical properties of the ASTM A249/A249M Type 348 steel are as follows:
| YieldRp0.2 | ≤ 582 (MPa) |
| TeileRm | ≤ 781 (MPa) |
| ImpactKV/Ku | 32(J) |
| ElongationA | 23% |
| Reduction in cross section on fractureZ | 34% |
| As-Heat-Treated Condition | Solution and Aging, Annealing, Ausaging, Q+T,etc |
| Brinell hardness (HBW) | 312 |
ASTM A249/A249M Type 348 Material Thermal Properties
The thermal performance parameters of the ASTM A249/A249M Type 348 steel are as follows:
| Temperature (°C) | 24 | 197 | 537 |
| Modulus of elasticity (GPa) | - | 914 | - |
| Mean coefficient of thermal expaion ×10-6/(°C) | - | - | 24 |
| Thermal conductivity (W/m·°C) | - | 41.3 | 32.2 |
| Specific thermal capacity (J/kg·°C) | - | 313 | - |
| Specific electrical resistivity (Ω mm²/m) | 0.41 | - | - |
| Deity (kg/dm³) | - | - | 322 |
| Poisson’s coefficient, ν | - | - | 434 |
ASTM A249/A249M Type 348 Material Machining Technology
When it comes to machining, ASTM A249/A249M Type 348 steel is extremely versatile. It possesses several advantages that make it an ideal solution for many industrial applications. One of the biggest advantages of machining ASTM A249/A249M Type 348 steel is its superior resistance to corrosion and abrasion. This quality makes it suitable for both indoors and outdoors applications, as well as use in environments with high levels of moisture or moisture changes. The material is also highly resistant to general wear and tear as well as cracking, meaning that it can handle high-stress applications. Furthermore, ASTM A249/A249M Type 348 steel can be formed into a range of intricate and complex shapes, making it an ideal solution for intricate and complex designs.