ASME SA-213/SA-213M Grade T91 Introduce
ASME SA-213/SA-213M Grade T91 is a low alloy steel used in boilers and heat exchangers. It is a popular material for these applications due to its excellent corrosion resistance, high strength and good weldability. The alloy has been in production since 1961 and is available in a wide range of forms and grades, allowing for maximum flexibility and creativity when creating a project.
Smelting temperature:1113°C - 1633°C
Application:Seamless ferritic and austenitic alloy steel tubes for boilers, superheaters and heat exchangers
ASME SA-213/SA-213M Grade T91 Material Mechanical Properties
The composition of ASME SA-213/SA-213M Grade T91 steel is typically composed of iron and a variety of alloying elements. Typically, the alloying elements consist of carbon, manganese, silicon, phosphorus, sulfur, chromium, molybdenum, and nickel. These elements can be added in different proportions in order to provide the desired mechanical and physical properties.
The mechanical properties of the ASME SA-213/SA-213M Grade T91 steel are as follows:
| YieldRp0.2 | ≤ 877 (MPa) |
| TeileRm | ≤ 189 (MPa) |
| ImpactKV/Ku | 41(J) |
| ElongationA | 23% |
| Reduction in cross section on fractureZ | 32% |
| As-Heat-Treated Condition | Solution and Aging, Annealing, Ausaging, Q+T,etc |
| Brinell hardness (HBW) | 212 |
ASME SA-213/SA-213M Grade T91 Material Thermal Properties
The thermal performance parameters of the ASME SA-213/SA-213M Grade T91 steel are as follows:
| Temperature (°C) | 22 | 284 | 534 |
| Modulus of elasticity (GPa) | - | 574 | - |
| Mean coefficient of thermal expaion ×10-6/(°C) | - | - | 24 |
| Thermal conductivity (W/m·°C) | - | 13.3 | 11.2 |
| Specific thermal capacity (J/kg·°C) | - | 211 | - |
| Specific electrical resistivity (Ω mm²/m) | 0.31 | - | - |
| Deity (kg/dm³) | - | - | 444 |
| Poisson’s coefficient, ν | - | - | 421 |
ASME SA-213/SA-213M Grade T91 Material Machining Technology
Corrosion resistance is a measure of a material's ability to resist rust and other forms of oxidation. ASME SA-213/SA-213M Grade T91 steel has excellent corrosion resistance, thanks to its high alloy content. The chromium and nickel present in the alloy form a protective layer on the surface of the steel, protecting it from the elements. Other elements, such as molybdenum, silicon and phosphorus, also contribute to the alloy's corrosion resistance by increasing hardness and reducing porosity.