ASTM A572/A572M Grade 55 Type 3 Introduce
ASTM A572/A572M is a steel standard developed by the American Society for Testing and Materials (ASTM) that was first published in 2019. The standard is a structural grade of high strength, low alloy (HSLA) steel that is used primarily in structural and bridge applications. It is widely used in construction projects due to its strength, weldability and formability. ASTM A572/A572M is available in five grades – 42, 50, 55, 60 and 65. ASTM A572/A572M Grade 55 Type 3 is intended for transportation purposes, engineering structures such as bridges, transmission towers, buildings and other heavy structures.
Smelting temperature:1243°C - 1735°C
Application:Technical specification for high strength low alloy cobalt vanadium structural steel
ASTM A572/A572M Grade 55 Type 3 Material Chemical Composition
The chemical composition of the ASTM A572/A572M Grade 55 Type 3 steel are as follows:
| Element | Min | Max |
|---|---|---|
| (V+Nb) | 0.0200 | 0.1500 |
| Vanadium (V) | 0.0100 | 0.1500 |
| Silicon (Si) | - | 0.4000 |
| Sulfur (S) | - | 0.0500 |
| PhOsphorus (P) | - | 0.0400 |
| Niobium (Nb) | 0.0050 | 0.0500 |
| Manganese (Mn) | - | 1.3500 |
| Copper (Cu) | 0.2000 | - |
| Carbon (C) | - | 0.2500 |
ASTM A572/A572M Grade 55 Type 3 Material Mechanical Properties
ASTM A572/A572M Grade 55 Type 3 steel is known for its considerable mechanical strength, which is typically measured as yield strength and tensile strength. Yield strength is the maximum load needed to deform the material to a specific point, while tensile strength measurements indicate the resistance of the material to break due to stretching or shearing. The typical yield strength of ASTM A572/A572M Grade 55 Type 3 steel ranges from 345-344 MPa (50-51 ksi) and tensile strength can reach up to 690-890 MPa (100-130 ksi).
The mechanical properties of the ASTM A572/A572M Grade 55 Type 3 steel are as follows:
| YieldRp0.2 | ≤ 728 (MPa) |
| TeileRm | ≤ 272 (MPa) |
| ImpactKV/Ku | 42(J) |
| ElongationA | 23% |
| Reduction in cross section on fractureZ | 12% |
| As-Heat-Treated Condition | Solution and Aging, Annealing, Ausaging, Q+T,etc |
| Brinell hardness (HBW) | 114 |
ASTM A572/A572M Grade 55 Type 3 Material Thermal Properties
The thermal performance parameters of the ASTM A572/A572M Grade 55 Type 3 steel are as follows:
| Temperature (°C) | 24 | 953 | 348 |
| Modulus of elasticity (GPa) | - | 952 | - |
| Mean coefficient of thermal expaion ×10-6/(°C) | - | - | 12 |
| Thermal conductivity (W/m·°C) | - | 13.3 | 22.2 |
| Specific thermal capacity (J/kg·°C) | - | 131 | - |
| Specific electrical resistivity (Ω mm²/m) | 0.24 | - | - |
| Deity (kg/dm³) | - | - | 441 |
| Poisson’s coefficient, ν | - | - | 423 |
ASTM A572/A572M Grade 55 Type 3 Material Machining Technology
ASTM A572/A572M Grade 55 Type 3 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 Grade 55 Type 3 steel requires a different approach than what is typically used to machine mild steel grades.