ASTM A572/A572M Grade 345 Type 2 Introduce
The primary purpose of the ASTM A572/A572M standard is to provide performance standards for HSLA steel used in transportation and construction applications. This standard helps to ensure that HSLA steel meets the requirements specified for a particular application.
Smelting temperature:1768°C - 1659°C
Application:Technical specification for high strength low alloy cobalt vanadium structural steel
ASTM A572/A572M Grade 345 Type 2 Material Chemical Composition
The chemical composition of the ASTM A572/A572M Grade 345 Type 2 steel are as follows:
| Element | Min | Max |
|---|---|---|
| Vanadium (V) | 0.0100 | 0.0500 |
| Silicon (Si) | - | 0.4000 |
| Sulfur (S) | - | 0.0500 |
| PhOsphorus (P) | - | 0.0400 |
| Manganese (Mn) | - | 1.3500 |
| Copper (Cu) | 0.2000 | - |
| Carbon (C) | - | 0.2300 |
ASTM A572/A572M Grade 345 Type 2 Material Mechanical Properties
The surface hardness of this steel is also notable, with the Brinell hardness scale value ranging from 216–302 for different grades. Brinell hardness is a measure of how hard a material is when subjected to an indentation test. ASTM A572/A572M Grade 345 Type 2 steel is also known for its good ductility, which is a measure of the material's ability to be drawn into a wire form without breaking.
The mechanical properties of the ASTM A572/A572M Grade 345 Type 2 steel are as follows:
| YieldRp0.2 | ≤ 899 (MPa) |
| TeileRm | ≤ 645 (MPa) |
| ImpactKV/Ku | 41(J) |
| ElongationA | 44% |
| Reduction in cross section on fractureZ | 21% |
| As-Heat-Treated Condition | Solution and Aging, Annealing, Ausaging, Q+T,etc |
| Brinell hardness (HBW) | 133 |
ASTM A572/A572M Grade 345 Type 2 Material Thermal Properties
The thermal performance parameters of the ASTM A572/A572M Grade 345 Type 2 steel are as follows:
| Temperature (°C) | 11 | 448 | 564 |
| Modulus of elasticity (GPa) | - | 178 | - |
| Mean coefficient of thermal expaion ×10-6/(°C) | - | - | 43 |
| Thermal conductivity (W/m·°C) | - | 22.3 | 12.2 |
| Specific thermal capacity (J/kg·°C) | - | 111 | - |
| Specific electrical resistivity (Ω mm²/m) | 0.11 | - | - |
| Deity (kg/dm³) | - | - | 434 |
| Poisson’s coefficient, ν | - | - | 411 |
ASTM A572/A572M Grade 345 Type 2 Material Machining Technology
There are several machining methods that can be used to create parts out of ASTM A572/A572M Grade 345 Type 2 steel. These methods include traditional turning, milling, drilling, grinding, and broaching. Each of these methods uses different tools and has its own associated advantages and disadvantages.