ASTM A240/A240M A240 XM-29 Introduce
ASTM A240/A240M A240 XM-29 is a valuable reference for anyone who has to procure stainless steel products for general and stress relieved pressure vessels. It also provides comprehensive product guidance and manufacturing instructions, making it an invaluable tool for engineers, quality control personnel, and stainless steel product manufacturers.
Smelting temperature:1632°C - 1429°C
Application:Heat-resistant chrome and chrome-nickel stainless steel sheets, sheets and strips for pressure vessels
ASTM A240/A240M A240 XM-29 Material Chemical Composition
The chemical composition of the ASTM A240/A240M A240 XM-29 steel are as follows:
| Element | Min | Max |
|---|---|---|
| Nitrogen (N) | 0.2000 | 0.4000 |
| Nickel (Ni) | 2.3000 | 3.7000 |
| Chromium (Cr) | 17.0000 | 19.0000 |
| PhOsphorus (P) | - | 0.0600 |
| Sulfur (S) | - | 0.0300 |
| Manganese (Mn) | 11.5000 | 14.5000 |
| Silicon (Si) | - | 0.7500 |
| Carbon (C) | - | 0.0800 |
ASTM A240/A240M A240 XM-29 Material Mechanical Properties
The mechanical properties of ASTM A240/A240M A240 XM-29 steel can vary greatly depending on the cold working that has been applied to it. The tensile strength of the steel ranges from 515 MPa to 785 MPa, depending on the amount of cold working. The yield strength is also dependent on the amount of cold working, ranging from 275 MPa to 525 MPa. This steel is also very tough and resistant to stress corrosion cracking.
The mechanical properties of the ASTM A240/A240M A240 XM-29 steel are as follows:
| YieldRp0.2 | ≤ 687 (MPa) |
| TeileRm | ≤ 587 (MPa) |
| ImpactKV/Ku | 41(J) |
| ElongationA | 13% |
| Reduction in cross section on fractureZ | 42% |
| As-Heat-Treated Condition | Solution and Aging, Annealing, Ausaging, Q+T,etc |
| Brinell hardness (HBW) | 342 |
ASTM A240/A240M A240 XM-29 Material Thermal Properties
The thermal performance parameters of the ASTM A240/A240M A240 XM-29 steel are as follows:
| Temperature (°C) | 32 | 693 | 183 |
| Modulus of elasticity (GPa) | - | 614 | - |
| Mean coefficient of thermal expaion ×10-6/(°C) | - | - | 24 |
| Thermal conductivity (W/m·°C) | - | 24.3 | 44.2 |
| Specific thermal capacity (J/kg·°C) | - | 242 | - |
| Specific electrical resistivity (Ω mm²/m) | 0.23 | - | - |
| Deity (kg/dm³) | - | - | 432 |
| Poisson’s coefficient, ν | - | - | 224 |
ASTM A240/A240M A240 XM-29 Material Machining Technology
When machining ASTM A240/A240M A240 XM-29 steel, the most important factor is machining speed and cutting forces. Machining speeds should be kept as low as possible, and a slow and steady cutting rate is recommended. This will reduce vibrations, wear on cutting tools, and will minimize the material's tendency to work harden during the machining process. An adequate amount of coolant should also be used to facilitate a smooth cut.