ASTM A240/A240M Type 321H Introduce
The ASTM A240/A240M Type 321H steel is widely used in a range of products and applications. Some of the common applications include refrigerators, tanks and boilers, pressure vessels, heat exchangers and chemical processing equipment. It is also used in structural and infrastructure projects such as bridges, buildings and other constructions.
Smelting temperature:1939°C - 1297°C
Application:Heat-resistant chrome and chrome-nickel stainless steel sheets, sheets and strips for pressure vessels
ASTM A240/A240M Type 321H Material Chemical Composition
The chemical composition of the ASTM A240/A240M Type 321H steel are as follows:
| Element | Min | Max |
|---|---|---|
| Titanium (Ti) | - | 0.7000 |
| Silicon (Si) | - | 0.7500 |
| Sulfur (S) | - | 0.0300 |
| PhOsphorus (P) | - | 0.0450 |
| Nickel (Ni) | 9.0000 | 12.0000 |
| Manganese (Mn) | - | 2.0000 |
| Chromium (Cr) | 17.0000 | 19.0000 |
| Carbon (C) | 0.0400 | 0.1000 |
ASTM A240/A240M Type 321H Material Mechanical Properties
ASTM A240/A240M Type 321H steel has excellent mechanical properties that make it suitable for many different applications. It provides high tensile and yield strengths, a high degree of hardness, impact strength, and excellent corrosion resistance.
The mechanical properties of the ASTM A240/A240M Type 321H steel are as follows:
| YieldRp0.2 | ≤ 991 (MPa) |
| TeileRm | ≤ 938 (MPa) |
| ImpactKV/Ku | 42(J) |
| ElongationA | 11% |
| Reduction in cross section on fractureZ | 42% |
| As-Heat-Treated Condition | Solution and Aging, Annealing, Ausaging, Q+T,etc |
| Brinell hardness (HBW) | 441 |
ASTM A240/A240M Type 321H Material Thermal Properties
The thermal performance parameters of the ASTM A240/A240M Type 321H steel are as follows:
| Temperature (°C) | 31 | 899 | 184 |
| Modulus of elasticity (GPa) | - | 563 | - |
| Mean coefficient of thermal expaion ×10-6/(°C) | - | - | 34 |
| Thermal conductivity (W/m·°C) | - | 33.3 | 42.2 |
| Specific thermal capacity (J/kg·°C) | - | 232 | - |
| Specific electrical resistivity (Ω mm²/m) | 0.24 | - | - |
| Deity (kg/dm³) | - | - | 313 |
| Poisson’s coefficient, ν | - | - | 131 |
ASTM A240/A240M Type 321H Material Machining Technology
When machining ASTM A240/A240M Type 321H steel, chip formation should be monitored closely to ensure that no warping or surface defects occur. Chip breakers may be used to help reduce chip formation, while depth of cut, feed rate, and cutting speed should all be set to minimize the load applied to the tool.