ASTM A240/A240M S21400 Introduce
ASTM A240/A240M S21400 is an international standard that specifies requirements for chromium and chromium-nickel stainless steel plate, sheet, and strip for pressure vessels and for general applications. It applies to the following grades: type 304, 304L, 316, 316L, 321, and 347, for rolled and forged products; and type 304H, 347H, 17-4PH, 630, and 631/N08367, for hot- and cold-rolled sheet and strip.
Smelting temperature:1856°C - 1184°C
Application:Heat-resistant chrome and chrome-nickel stainless steel sheets, sheets and strips for pressure vessels
ASTM A240/A240M S21400 Material Mechanical Properties
Another mechanical property of ASTM A240/A240M S21400 steel is its hardness. This type of steel is typically between 26 and 29 on the Rockwell B scale. This degree of hardness is ideal for construction and other applications as it enables the material to withstand wear and tear better than softer metals.
The mechanical properties of the ASTM A240/A240M S21400 steel are as follows:
| YieldRp0.2 | ≤ 765 (MPa) |
| TeileRm | ≤ 822 (MPa) |
| ImpactKV/Ku | 32(J) |
| ElongationA | 11% |
| Reduction in cross section on fractureZ | 23% |
| As-Heat-Treated Condition | Solution and Aging, Annealing, Ausaging, Q+T,etc |
| Brinell hardness (HBW) | 212 |
ASTM A240/A240M S21400 Material Thermal Properties
The thermal performance parameters of the ASTM A240/A240M S21400 steel are as follows:
| Temperature (°C) | 42 | 515 | 768 |
| Modulus of elasticity (GPa) | - | 216 | - |
| Mean coefficient of thermal expaion ×10-6/(°C) | - | - | 14 |
| Thermal conductivity (W/m·°C) | - | 11.3 | 44.2 |
| Specific thermal capacity (J/kg·°C) | - | 424 | - |
| Specific electrical resistivity (Ω mm²/m) | 0.33 | - | - |
| Deity (kg/dm³) | - | - | 341 |
| Poisson’s coefficient, ν | - | - | 314 |
ASTM A240/A240M S21400 Material Machining Technology
ASTM A240/A240M S21400 steel is more difficult to work with due to its high temperature strength, low ductility, and high yield strength. When machining, the tool must be sharp, and a wider cutting edge must be used to avoid tool failure. Additionally, stainless steel is not suitable for welding, as it requires special procedures to prevent cracking or corrosion.