ASTM A656/A656M 345-Ⅶ Introduce
The mechanical properties of ASTM A656/A656M 345-Ⅶ steel make it a great choice for many applications. It has higher tensile strength and creep resistance than other steels and is often used in structural applications. The yield strength of ASTM A656/A656M 345-Ⅶ steel is 380 MPa and the tensile strength is 490-620 MPa. It has good toughness down to -20° C, which makes it suitable for use in a wide range of temperatures.
Smelting temperature:1812°C - 1256°C
Application:High-strength low-alloy hot-rolled structural steel plate with improved forgeability
ASTM A656/A656M 345-Ⅶ Material Chemical Composition
The chemical composition of the ASTM A656/A656M 345-Ⅶ steel are as follows:
| Element | Min | Max |
|---|---|---|
| Manganese (Mn) | - | 1.6500 |
| Copper (Cu) | - | 0.1000 |
| Vanadium (V) | - | 0.1500 |
| Nickel (Ni) | - | 0.0200 |
| PhOsphorus (P) | - | 0.0250 |
| Sulfur (S) | - | 0.0350 |
| Silicon (Si) | - | 0.6000 |
| Carbon (C) | - | 0.1800 |
| Niobium (Nb) | - | 0.1000 |
ASTM A656/A656M 345-Ⅶ Material Mechanical Properties
Elongation is a measure of a material's ductility; it is a measure of the degree to which a material can be stretched before it fractures or breaks. Elongation is typically measured in a percent format, with higher values denoting more ductile materials that can withstand greater elongation. The minimum elongation for ASTM A656/A656M 345-Ⅶ steel is 18%. This value is significantly greater than most other hot-rolled steel grades and indicates that ASTM A656/A656M 345-Ⅶ is an excellent choice for components that require stretching without risk of failure.
The mechanical properties of the ASTM A656/A656M 345-Ⅶ steel are as follows:
| YieldRp0.2 | ≤ 966 (MPa) |
| TeileRm | ≤ 134 (MPa) |
| ImpactKV/Ku | 33(J) |
| ElongationA | 22% |
| Reduction in cross section on fractureZ | 22% |
| As-Heat-Treated Condition | Solution and Aging, Annealing, Ausaging, Q+T,etc |
| Brinell hardness (HBW) | 444 |
ASTM A656/A656M 345-Ⅶ Material Thermal Properties
The thermal performance parameters of the ASTM A656/A656M 345-Ⅶ steel are as follows:
| Temperature (°C) | 12 | 518 | 392 |
| Modulus of elasticity (GPa) | - | 291 | - |
| Mean coefficient of thermal expaion ×10-6/(°C) | - | - | 32 |
| Thermal conductivity (W/m·°C) | - | 21.3 | 44.2 |
| Specific thermal capacity (J/kg·°C) | - | 424 | - |
| Specific electrical resistivity (Ω mm²/m) | 0.22 | - | - |
| Deity (kg/dm³) | - | - | 223 |
| Poisson’s coefficient, ν | - | - | 223 |
ASTM A656/A656M 345-Ⅶ Material Machining Technology
ASTM A656/A656M 345-Ⅶ steel is a type of low alloy high strength structural steel. It has a minimum yield strength of 460 MPa, an ultimate tensile strength of 690 MPa, and a minimum elongation of 22%. Machining ASTM A656/A656M 345-Ⅶ steel requires the use of specialized tools and techniques, as it is much more challenging to work with than traditional steels.