ASTM A1011/A1011M SS Grade 55 Introduce
ASTM A1011/A1011M SS Grade 55 is a versatile low-carbon, high-strength steel with a variety of applications in the automotive and construction industries. Its mechanical properties depend primarily on its chemical composition and can be further improved by adding specific elements. Additionally, ASTM A1011/A1011M SS Grade 55 has a number of other advantageous properties, such as corrosion and wear resistance, good weldability, and economical cost. As a result, it is an ideal choice for many types of structural and non-structural components.
Smelting temperature:1123°C - 1571°C
Application:Standard Specification for Steel Sheet and Strip, Hot-Rolled, Carbon, Structural, High-Strength Low-Alloy, High-Strength Low-Alloy with Improved Formability
ASTM A1011/A1011M SS Grade 55 Material Chemical Composition
The chemical composition of the ASTM A1011/A1011M SS Grade 55 steel are as follows:
| Element | Min | Max |
|---|---|---|
| Vanadium (V) | - | 0.0080 |
| Titanium (Ti) | - | 0.0250 |
| Sulfur (S) | - | 0.0400 |
| PhOsphorus (P) | - | 0.0350 |
| Nickel (Ni) | - | 0.2000 |
| Niobium (Nb) | - | 0.0080 |
| Molybdenum (Mo) | - | 0.0600 |
| Manganese (Mn) | - | 1.3500 |
| Copper (Cu) | - | 0.2000 |
| Chromium (Cr) | - | 0.1500 |
| Carbon (C) | - | 0.2500 |
ASTM A1011/A1011M SS Grade 55 Material Mechanical Properties
ASTM A1011/A1011M SS Grade 55 is a hot rolled, affinity-annealed, low carbon steel with a substrate of 2.25-3.0 percent carbon and micro-alloying elements. The alloying elements provide a stronger and more uniform material structure and increased tensile strength. This makes it suitable for applications such as structural beams, agricultural uses, and high pressure applications like pressurized gas lines.
The mechanical properties of the ASTM A1011/A1011M SS Grade 55 steel are as follows:
| YieldRp0.2 | ≤ 842 (MPa) |
| TeileRm | ≤ 876 (MPa) |
| ImpactKV/Ku | 33(J) |
| ElongationA | 34% |
| Reduction in cross section on fractureZ | 21% |
| As-Heat-Treated Condition | Solution and Aging, Annealing, Ausaging, Q+T,etc |
| Brinell hardness (HBW) | 123 |
ASTM A1011/A1011M SS Grade 55 Material Thermal Properties
The thermal performance parameters of the ASTM A1011/A1011M SS Grade 55 steel are as follows:
| Temperature (°C) | 13 | 212 | 785 |
| Modulus of elasticity (GPa) | - | 735 | - |
| Mean coefficient of thermal expaion ×10-6/(°C) | - | - | 43 |
| Thermal conductivity (W/m·°C) | - | 13.3 | 32.2 |
| Specific thermal capacity (J/kg·°C) | - | 144 | - |
| Specific electrical resistivity (Ω mm²/m) | 0.23 | - | - |
| Deity (kg/dm³) | - | - | 223 |
| Poisson’s coefficient, ν | - | - | 242 |
ASTM A1011/A1011M SS Grade 55 Material Machining Technology
The machining of ASTM A1011/A1011M SS Grade 55 steel is a process that needs to be done with precision and care. It is important to consider the type of process, cutting tools, and speeds used to ensure a quality result. Milling, turning, drilling, and grinding are all common processes that can be used to machine ASTM A1011/A1011M SS Grade 55 steel, but each process requires different speeds, cutting tools, and lubricants. By following the guidelines outlined in this article, a reliable, quality end-product can be achieved.