ASTM A572/A572M 55 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:1597°C - 1951°C
Application:Technical specification for high strength low alloy cobalt vanadium structural steel
ASTM A572/A572M 55 Type 2 Material Chemical Composition
The chemical composition of the ASTM A572/A572M 55 Type 2 steel are as follows:
| Element | Min | Max |
|---|---|---|
| Vanadium (V) | 0.0100 | 0.1500 |
| Silicon (Si) | - | 0.4000 |
| Sulfur (S) | - | 0.0500 |
| PhOsphorus (P) | - | 0.0400 |
| Manganese (Mn) | - | 1.3500 |
| Copper (Cu) | 0.2000 | - |
| Carbon (C) | - | 0.2500 |
ASTM A572/A572M 55 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 55 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 55 Type 2 steel are as follows:
| YieldRp0.2 | ≤ 185 (MPa) |
| TeileRm | ≤ 483 (MPa) |
| ImpactKV/Ku | 32(J) |
| ElongationA | 12% |
| Reduction in cross section on fractureZ | 41% |
| As-Heat-Treated Condition | Solution and Aging, Annealing, Ausaging, Q+T,etc |
| Brinell hardness (HBW) | 133 |
ASTM A572/A572M 55 Type 2 Material Thermal Properties
The thermal performance parameters of the ASTM A572/A572M 55 Type 2 steel are as follows:
| Temperature (°C) | 14 | 491 | 875 |
| Modulus of elasticity (GPa) | - | 623 | - |
| Mean coefficient of thermal expaion ×10-6/(°C) | - | - | 33 |
| Thermal conductivity (W/m·°C) | - | 22.3 | 32.2 |
| Specific thermal capacity (J/kg·°C) | - | 211 | - |
| Specific electrical resistivity (Ω mm²/m) | 0.34 | - | - |
| Deity (kg/dm³) | - | - | 223 |
| Poisson’s coefficient, ν | - | - | 331 |
ASTM A572/A572M 55 Type 2 Material Machining Technology
ASTM A572/A572M 55 Type 2 is a high strength low alloy steel grade used in a variety of structural applications. It is commonly used in bridges, buildings, construction equipment, transmission towers, machinery parts, and other structures. Due to its superior mechanical properties, it is often machined to create industrial products such as: nuts, bolts, washers, shafts and pins. Machining ASTM A572/A572M 55 Type 2 steel requires a different approach than what is typically used to machine mild steel grades.