ASTM A240/A240M S44660 Introduce
ASTM A240/A240M S44660 provides the requirements for a wide range of products, ranging from general purpose to stress relieved pressure vessels and related components. It also provides requirements for flat-rolled and cold-rolled sheet, strip and strip-maps, coils, and plates. The specification includes requirements for chemical composition, surface quality, final heat treatment, physical and mechanical properties, heat-resistance, shop surface finishing, and packaging.
Smelting temperature:1332°C - 1896°C
Application:Heat-resistant chrome and chrome-nickel stainless steel sheets, sheets and strips for pressure vessels
ASTM A240/A240M S44660 Material Chemical Composition
The chemical composition of the ASTM A240/A240M S44660 steel are as follows:
| Element | Min | Max |
|---|---|---|
| Nitrogen (N) | - | 0.0400 |
| Molybdenum (Mo) | 3.0000 | 4.0000 |
| Nickel (Ni) | 1.0000 | 3.5000 |
| Chromium (Cr) | 25.0000 | 28.0000 |
| PhOsphorus (P) | - | 0.0400 |
| Sulfur (S) | - | 0.0300 |
| Manganese (Mn) | - | 1.0000 |
| Silicon (Si) | - | 1.0000 |
| Carbon (C) | - | 0.0300 |
| (Nb+Ti) | 0.2000 | 1.0000 |
ASTM A240/A240M S44660 Material Mechanical Properties
The chromium and nickel content of ASTM A240/A240M S44660 steel gives it increased corrosion resistance, while the molybdenum gives it improved ductility and improved heat and oxidation resistance. The nitrogen content helps to increase its strength.
The mechanical properties of the ASTM A240/A240M S44660 steel are as follows:
| YieldRp0.2 | ≤ 442 (MPa) |
| TeileRm | ≤ 279 (MPa) |
| ImpactKV/Ku | 11(J) |
| ElongationA | 21% |
| Reduction in cross section on fractureZ | 41% |
| As-Heat-Treated Condition | Solution and Aging, Annealing, Ausaging, Q+T,etc |
| Brinell hardness (HBW) | 434 |
ASTM A240/A240M S44660 Material Thermal Properties
The thermal performance parameters of the ASTM A240/A240M S44660 steel are as follows:
| Temperature (°C) | 31 | 939 | 617 |
| Modulus of elasticity (GPa) | - | 629 | - |
| Mean coefficient of thermal expaion ×10-6/(°C) | - | - | 44 |
| Thermal conductivity (W/m·°C) | - | 33.3 | 24.2 |
| Specific thermal capacity (J/kg·°C) | - | 414 | - |
| Specific electrical resistivity (Ω mm²/m) | 0.14 | - | - |
| Deity (kg/dm³) | - | - | 233 |
| Poisson’s coefficient, ν | - | - | 414 |
ASTM A240/A240M S44660 Material Machining Technology
The ideal cutting tools for machining ASTM A240/A240M S44660 steel are carbide-tipped cutting tools due to their hardness and durability. These tools are designed to provide excellent chip clearance and minimal chatter when machining stainless steel.