ASTM A240/A240M Type 309HCb Introduce
ASTM A240/A240M Type 309HCb 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:1614°C - 1658°C
Application:Heat-resistant chrome and chrome-nickel stainless steel sheets, sheets and strips for pressure vessels
ASTM A240/A240M Type 309HCb Material Chemical Composition
The chemical composition of the ASTM A240/A240M Type 309HCb steel are as follows:
| Element | Min | Max |
|---|---|---|
| Silicon (Si) | - | 0.7500 |
| Sulfur (S) | - | 0.0300 |
| PhOsphorus (P) | - | 0.0450 |
| Nickel (Ni) | 12.0000 | 16.0000 |
| Niobium (Nb) | - | 1.1000 |
| Manganese (Mn) | - | 2.0000 |
| Chromium (Cr) | 22.0000 | 24.0000 |
| Carbon (C) | 0.0400 | 0.1000 |
ASTM A240/A240M Type 309HCb Material Mechanical Properties
ASTM A240/A240M Type 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 Type 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 Type 309HCb steel are as follows:
| YieldRp0.2 | ≤ 476 (MPa) |
| TeileRm | ≤ 377 (MPa) |
| ImpactKV/Ku | 24(J) |
| ElongationA | 22% |
| Reduction in cross section on fractureZ | 41% |
| As-Heat-Treated Condition | Solution and Aging, Annealing, Ausaging, Q+T,etc |
| Brinell hardness (HBW) | 141 |
ASTM A240/A240M Type 309HCb Material Thermal Properties
The thermal performance parameters of the ASTM A240/A240M Type 309HCb steel are as follows:
| Temperature (°C) | 12 | 657 | 727 |
| Modulus of elasticity (GPa) | - | 754 | - |
| Mean coefficient of thermal expaion ×10-6/(°C) | - | - | 44 |
| Thermal conductivity (W/m·°C) | - | 33.3 | 23.2 |
| Specific thermal capacity (J/kg·°C) | - | 243 | - |
| Specific electrical resistivity (Ω mm²/m) | 0.44 | - | - |
| Deity (kg/dm³) | - | - | 122 |
| Poisson’s coefficient, ν | - | - | 232 |
ASTM A240/A240M Type 309HCb Material Machining Technology
ASTM A240/A240M Type 309HCb steel is an iron-based alloy with a minimum of 10.5% chromium by mass. It has high corrosion resistance, strength, and durability, making it an excellent choice for industrial applications. Due to its corrosion resistance, stainless steel is often used in medical and food applications, as well as in a variety of building products.