ASTM A684/A684M 1075 Introduce
ASTM A684/A684M 1075 steel is a medium carbon, low alloy steel often used for the construction of various structural components. The steel has excellent weldability and formability and good mechanical properties, making it suitable for a variety of applications. The steel has a tensile strength of 696MPa and a yield strength of 485MPa, making it strong enough for applications such as bridge components and vehicle frames. The steel also has a good impact energy of 27J at -20 degrees Celsius, making it suitable for applications where the steel needs to be resistant to impacts, such as crane booms. The steel also has good hardness and machinability, allowing it to be easily cut and fabricated. This makes it suitable for a variety of applications and is one of the reasons why it is so widely used.
Smelting temperature:1481°C - 1581°C
Application:Cold rolled high carbon steel strip
ASTM A684/A684M 1075 Material Chemical Composition
The chemical composition of the ASTM A684/A684M 1075 steel are as follows:
| Element | Min | Max |
|---|---|---|
| Carbon (C) | 0.7000 | 0.8000 |
| Manganese (Mn) | 0.4000 | 0.7000 |
| PhOsphorus (P) | - | 0.0300 |
| Sulfur (S) | - | 0.0350 |
| Silicon (Si) | 0.1500 | 0.3000 |
| Nickel (Ni) | - | 0.3000 |
| Chromium (Cr) | - | 0.2500 |
| Molybdenum (Mo) | - | 0.1000 |
| Copper (Cu) | - | 0.3000 |
| (Cr+Ni+Cu+Mo) | - | 0.8000 |
| Silicon (Si) | 0.1500 | 0.3000 |
| Nickel (Ni) | - | 0.3000 |
| Molybdenum (Mo) | - | 0.1000 |
| Copper (Cu) | - | 0.3000 |
| Chromium (Cr) | - | 0.2500 |
ASTM A684/A684M 1075 Material Mechanical Properties
One of the major advantages of ASTM A684/A684M 1075 steel is its corrosion resistance. Increased chromium and molybdenum contents make the steel more resistant to corrosion in different environments, including salt water and certain acidic solutions. Chromium forms a protective oxide layer on the surface of the steel, which helps to prevent further corrosion. The nickel content also improves corrosion resistance, making it a great choice for marine applications.
The mechanical properties of the ASTM A684/A684M 1075 steel are as follows:
| YieldRp0.2 | ≤ 331 (MPa) |
| TeileRm | ≤ 764 (MPa) |
| ImpactKV/Ku | 33(J) |
| ElongationA | 41% |
| Reduction in cross section on fractureZ | 22% |
| As-Heat-Treated Condition | Solution and Aging, Annealing, Ausaging, Q+T,etc |
| Brinell hardness (HBW) | 343 |
ASTM A684/A684M 1075 Material Thermal Properties
The thermal performance parameters of the ASTM A684/A684M 1075 steel are as follows:
| Temperature (°C) | 31 | 632 | 671 |
| Modulus of elasticity (GPa) | - | 313 | - |
| Mean coefficient of thermal expaion ×10-6/(°C) | - | - | 41 |
| Thermal conductivity (W/m·°C) | - | 33.3 | 23.2 |
| Specific thermal capacity (J/kg·°C) | - | 433 | - |
| Specific electrical resistivity (Ω mm²/m) | 0.31 | - | - |
| Deity (kg/dm³) | - | - | 422 |
| Poisson’s coefficient, ν | - | - | 132 |
ASTM A684/A684M 1075 Material Machining Technology
Due to its combination of excellent mechanical properties, ASTM A684/A684M 1075 steel is often used in applications where strength, formability, and machinability are essential. The steel is often used in bridge components, such as girders and beams, vehicle frames, guardrails, and crane booms. The steel is also often used in tilting chassis, used in applications such as forklifts and cranes, due to its high strength and formability. The steel also has good machinability, allowing it to be efficiently cut and drilled for fabrication.