ASTM A240/A240M 309HCb Introduce
The ASTM A240/A240M 309HCb 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:1578°C - 1314°C
Application:Heat-resistant chrome and chrome-nickel stainless steel sheets, sheets and strips for pressure vessels
ASTM A240/A240M 309HCb Material Chemical Composition
The chemical composition of the ASTM A240/A240M 309HCb steel are as follows:
| Element | Min | Max |
|---|---|---|
| Nickel (Ni) | 12.0000 | 16.0000 |
| Chromium (Cr) | 22.0000 | 24.0000 |
| PhOsphorus (P) | - | 0.0450 |
| Sulfur (S) | - | 0.0300 |
| Manganese (Mn) | - | 2.0000 |
| Silicon (Si) | - | 0.7500 |
| Carbon (C) | 0.0400 | 0.1000 |
ASTM A240/A240M 309HCb Material Mechanical Properties
ASTM A240/A240M 309HCb is a popular steel grade used. It is widely used in chromium and chromium-nickel stainless steel plate, sheet, and strip for pressure vessels and for general applications. ASTM A240/A240M 309HCb steel has excellent mechanical properties, including excellent tensile and yield strength. It also has very good corrosion resistance and is used widely in many application fields.
The mechanical properties of the ASTM A240/A240M 309HCb steel are as follows:
| YieldRp0.2 | ≤ 855 (MPa) |
| TeileRm | ≤ 519 (MPa) |
| ImpactKV/Ku | 13(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) | 221 |
ASTM A240/A240M 309HCb Material Thermal Properties
The thermal performance parameters of the ASTM A240/A240M 309HCb steel are as follows:
| Temperature (°C) | 21 | 571 | 623 |
| Modulus of elasticity (GPa) | - | 513 | - |
| Mean coefficient of thermal expaion ×10-6/(°C) | - | - | 12 |
| Thermal conductivity (W/m·°C) | - | 31.3 | 21.2 |
| Specific thermal capacity (J/kg·°C) | - | 112 | - |
| Specific electrical resistivity (Ω mm²/m) | 0.33 | - | - |
| Deity (kg/dm³) | - | - | 224 |
| Poisson’s coefficient, ν | - | - | 211 |
ASTM A240/A240M 309HCb Material Machining Technology
When machining ASTM A240/A240M 309HCb 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.