ASTM A276 XM-21 Introduce
ASTM A276 XM-21 steel is an alloy of iron, chromium and nickel. The alloy is classified as a stainless steel since it contains at least 10.5% chromium. ASTM A276 XM-21 steel has a very high corrosion resistance and also possess good mechanical properties. This makes it an ideal choice for applications requiring extreme toughness and strength. ASTM A276 XM-21 steel can be heat-treated to obtain the desired hardness and strength.
Smelting temperature:1727°C - 1913°C
Application:Stainless steel bars and profiles
ASTM A276 XM-21 Material Chemical Composition
The chemical composition of the ASTM A276 XM-21 steel are as follows:
| Element | Min | Max |
|---|---|---|
| Nitrogen (N) | 0.1600 | 0.3000 |
| Nickel (Ni) | 8.0000 | 10.0000 |
| Chromium (Cr) | 18.0000 | 20.0000 |
| PhOsphorus (P) | - | 0.0450 |
| Sulfur (S) | - | 0.0300 |
| Manganese (Mn) | - | 2.0000 |
| Silicon (Si) | - | 1.0000 |
| Carbon (C) | - | 0.0800 |
ASTM A276 XM-21 Material Mechanical Properties
The mechanical properties of the ASTM A276 XM-21 steel are as follows:
| YieldRp0.2 | ≤ 291 (MPa) |
| TeileRm | ≤ 587 (MPa) |
| ImpactKV/Ku | 11(J) |
| ElongationA | 13% |
| Reduction in cross section on fractureZ | 22% |
| As-Heat-Treated Condition | Solution and Aging, Annealing, Ausaging, Q+T,etc |
| Brinell hardness (HBW) | 131 |
ASTM A276 XM-21 Material Thermal Properties
The thermal performance parameters of the ASTM A276 XM-21 steel are as follows:
| Temperature (°C) | 33 | 354 | 989 |
| Modulus of elasticity (GPa) | - | 628 | - |
| Mean coefficient of thermal expaion ×10-6/(°C) | - | - | 33 |
| Thermal conductivity (W/m·°C) | - | 24.3 | 14.2 |
| Specific thermal capacity (J/kg·°C) | - | 232 | - |
| Specific electrical resistivity (Ω mm²/m) | 0.44 | - | - |
| Deity (kg/dm³) | - | - | 321 |
| Poisson’s coefficient, ν | - | - | 344 |
ASTM A276 XM-21 Material Machining Technology
ASTM A276 XM-21 covers hot-finished or cold-finished bars, including rounds, angles, channels, tees and hexagons, as well as flats and other shapes such as hollows and convex shapes. To ensure the quality of stainless steel materials conforming to ASTM A276 XM-21, tests shall be performed on a series of key properties, such as composition, mechanical properties, corrosion resistance, and strength. Products that meet the necessary requirements must be labeled with ASTM A276 XM-21.