ASTM A656/A656M Type 3 Grade 345 Introduce
The maximum carbon content of the Type 3 Grade 345 grade should not exceed 0.18%. ASTM A656/A656M Type 3 Grade 345 is available in standard form in widths and lengths of 120 - 480 inches and mill lengths up to 960 inches. Lengths should generally be limited to the maximums shown depending on product form. ASTM A656/A656M Type 3 Grade 345 is typically produced as hot rolled coils or sheets, cold rolled coils or sheets, and pickled coils or sheets depending on needs.
Smelting temperature:1231°C - 1817°C
Application:High-strength low-alloy hot-rolled structural steel plate with improved forgeability
ASTM A656/A656M Type 3 Grade 345 Material Chemical Composition
The chemical composition of the ASTM A656/A656M Type 3 Grade 345 steel are as follows:
| Element | Min | Max |
|---|---|---|
| Carbon (C) | - | 0.1800 |
| Manganese (Mn) | - | 1.6500 |
| PhOsphorus (P) | - | 0.0250 |
| Sulfur (S) | - | 0.0300 |
| Silicon (Si) | - | 0.6000 |
| Vanadium (V) | - | 0.0800 |
| Nitrogen (N) | - | 0.0300 |
| Niobium (Nb) | 0.0800 | 0.1000 |
ASTM A656/A656M Type 3 Grade 345 Material Mechanical Properties
ASTM A656/A656M Type 3 Grade 345 steel is a type of hot-rolled structural steel that is widely used for applications requiring high strength and good formability. It has excellent strength and ductility, making it suitable for a variety of applications, from bridges and construction to shipbuilding and industrial equipment.
The mechanical properties of the ASTM A656/A656M Type 3 Grade 345 steel are as follows:
| YieldRp0.2 | ≤ 991 (MPa) |
| TeileRm | ≤ 679 (MPa) |
| ImpactKV/Ku | 34(J) |
| ElongationA | 24% |
| Reduction in cross section on fractureZ | 34% |
| As-Heat-Treated Condition | Solution and Aging, Annealing, Ausaging, Q+T,etc |
| Brinell hardness (HBW) | 244 |
ASTM A656/A656M Type 3 Grade 345 Material Thermal Properties
The thermal performance parameters of the ASTM A656/A656M Type 3 Grade 345 steel are as follows:
| Temperature (°C) | 32 | 157 | 461 |
| Modulus of elasticity (GPa) | - | 414 | - |
| Mean coefficient of thermal expaion ×10-6/(°C) | - | - | 32 |
| Thermal conductivity (W/m·°C) | - | 42.3 | 24.2 |
| Specific thermal capacity (J/kg·°C) | - | 223 | - |
| Specific electrical resistivity (Ω mm²/m) | 0.24 | - | - |
| Deity (kg/dm³) | - | - | 143 |
| Poisson’s coefficient, ν | - | - | 113 |
ASTM A656/A656M Type 3 Grade 345 Material Machining Technology
ASTM A656/A656M Type 3 Grade 345 is highly formable and can be readily welded, machined, and cold worked. It easily bends, curves, and can be cut to the required size and shape. It is possible that an increased amount of formability may be available in ASTM A656/A656M Type 3 Grade 345 as compared to standard carbon steels.