ASTM A841/A841M A841 Grade F Class 7 Introduce
The requirements for ASTM A841/A841M steel are stringent in order to ensure that the material will meet the needs of the end-user. The standard requires that the material must be composed of specified amounts of iron, carbon, manganese, silicon and copper as well as trace elements such as boron, phosphorus, sulfur and lead. The standard also requires that the material must meet certain mechanical properties such as yield strength, tensile strength, and minimum elongation. Additionally, the standard specifies requirements for surface conditions, test verification, sampling, and surface finish. The standard also outlines General Requirements, which are additional requirements that must be met such as heat treatment and weldability.
Smelting temperature:1527°C - 1164°C
Application:Steel plate processed by temperature mechanical control process for pressure vessels
ASTM A841/A841M A841 Grade F Class 7 Material Chemical Composition
The chemical composition of the ASTM A841/A841M A841 Grade F Class 7 steel are as follows:
| Element | Min | Max |
|---|---|---|
| Copper (Cu) | - | 0.4000 |
| Aluminum (Al) | - | 0.0200 |
| Niobium (Nb) | - | 0.1000 |
| Vanadium (V) | - | 0.0900 |
| Molybdenum (Mo) | - | 0.5000 |
| Nickel (Ni) | - | 0.8500 |
| Chromium (Cr) | - | 0.3000 |
| PhOsphorus (P) | - | 0.0200 |
| Sulfur (S) | - | 0.0080 |
| Manganese (Mn) | 1.1000 | 1.7000 |
| Silicon (Si) | 0.1000 | 0.4500 |
| Carbon (C) | - | 0.1000 |
| Manganese (Mn) | 1.1000 | 1.7000 |
| Carbon (C) | - | 0.1000 |
| Boron (B) | - | 0.0007 |
| Aluminum (Al) | 0.0200 | - |
ASTM A841/A841M A841 Grade F Class 7 Material Mechanical Properties
ASTM A841/A841M A841 Grade F Class 7 steel also has excellent ductility and formability properties, which enable it to withstand high strain rates without exhibiting too much deformation or impact absorption. The steel's ductility is derived from its fine-grain microstructure, which is able to resist the effects of large localized strains better than a coarse-grain microstructure. The ductility of the steel is enhanced further when it is placed in a hardened state, increasing its load-bearing capacity even more.
The mechanical properties of the ASTM A841/A841M A841 Grade F Class 7 steel are as follows:
| YieldRp0.2 | ≤ 594 (MPa) |
| TeileRm | ≤ 889 (MPa) |
| ImpactKV/Ku | 31(J) |
| ElongationA | 43% |
| Reduction in cross section on fractureZ | 32% |
| As-Heat-Treated Condition | Solution and Aging, Annealing, Ausaging, Q+T,etc |
| Brinell hardness (HBW) | 212 |
ASTM A841/A841M A841 Grade F Class 7 Material Thermal Properties
The thermal performance parameters of the ASTM A841/A841M A841 Grade F Class 7 steel are as follows:
| Temperature (°C) | 14 | 297 | 857 |
| Modulus of elasticity (GPa) | - | 137 | - |
| Mean coefficient of thermal expaion ×10-6/(°C) | - | - | 32 |
| Thermal conductivity (W/m·°C) | - | 12.3 | 43.2 |
| Specific thermal capacity (J/kg·°C) | - | 211 | - |
| Specific electrical resistivity (Ω mm²/m) | 0.22 | - | - |
| Deity (kg/dm³) | - | - | 334 |
| Poisson’s coefficient, ν | - | - | 443 |
ASTM A841/A841M A841 Grade F Class 7 Material Machining Technology
The selection of adequate tooling is critical for successful machining of ASTM A841/A841M A841 Grade F Class 7 steel. The material is quite hard, requiring a tooling set with a high hardness rating and capable of withstanding high cutting speeds. High speed steel (HSS) or tungsten carbide (TC) tools are good choices for this material. HSS is typically less expensive and easier to shape, while TC is more commonly used when dealing with hard materials due to its durability and its resistance to wear.