ASTM A656/A656M A656 Type 3 Grade 50 Introduce
ASTM A656/A656M is available in four grades: 50, 60, 70 and 80 (most popular) and 100 with the construction industry often using the materials for structural applications. The symbol A denotes that the material is structural steel. Following it, the number marks the yield strength of the material. A typical application for the ASTM A656/A656M A656 Type 3 Grade 50 is in bridges, buildings, and other construction structures where weight savings and improved formability is critical. It is also used for food processing and handling equipment, marine equipment, and other industrial applications.
Smelting temperature:1124°C - 1128°C
Application:High-strength low-alloy hot-rolled structural steel plate with improved forgeability
ASTM A656/A656M A656 Type 3 Grade 50 Material Chemical Composition
The chemical composition of the ASTM A656/A656M A656 Type 3 Grade 50 steel are as follows:
| Element | Min | Max |
|---|---|---|
| Carbon (C) | - | 0.1800 |
| Manganese (Mn) | - | 1.6500 |
| PhOsphorus (P) | - | 0.0250 |
| Sulfur (S) | - | 0.0300 |
| Silicon (Si) | - | 0.6000 |
| Vanadium (V) | - | 0.0800 |
| Nitrogen (N) | - | 0.0300 |
| Niobium (Nb) | 0.0080 | 0.1000 |
| Sulfur (S) | - | 0.0350 |
ASTM A656/A656M A656 Type 3 Grade 50 Material Mechanical Properties
Tensile strength is the maximum stress that can be applied to a material before it yields or breaks. It is also an indication of a material's ductility; the higher the tensile strength, the more ductile a material is considered to be. The minimum specified tensile strength for ASTM A656/A656M A656 Type 3 Grade 50 steel is 150 ksi. This yields the material with excellent formability and makes it suitable for applications subject to high stress levels.
The mechanical properties of the ASTM A656/A656M A656 Type 3 Grade 50 steel are as follows:
| YieldRp0.2 | ≤ 482 (MPa) |
| TeileRm | ≤ 113 (MPa) |
| ImpactKV/Ku | 32(J) |
| ElongationA | 42% |
| Reduction in cross section on fractureZ | 23% |
| As-Heat-Treated Condition | Solution and Aging, Annealing, Ausaging, Q+T,etc |
| Brinell hardness (HBW) | 133 |
ASTM A656/A656M A656 Type 3 Grade 50 Material Thermal Properties
The thermal performance parameters of the ASTM A656/A656M A656 Type 3 Grade 50 steel are as follows:
| Temperature (°C) | 12 | 113 | 154 |
| Modulus of elasticity (GPa) | - | 383 | - |
| Mean coefficient of thermal expaion ×10-6/(°C) | - | - | 32 |
| Thermal conductivity (W/m·°C) | - | 32.3 | 11.2 |
| Specific thermal capacity (J/kg·°C) | - | 433 | - |
| Specific electrical resistivity (Ω mm²/m) | 0.41 | - | - |
| Deity (kg/dm³) | - | - | 213 |
| Poisson’s coefficient, ν | - | - | 123 |
ASTM A656/A656M A656 Type 3 Grade 50 Material Machining Technology
When machining ASTM A656/A656M A656 Type 3 Grade 50 steel, the tool selection and cutting parameters must be carefully selected and optimized in order to get the desired result. Carbide and high speed steel tool materials are the most common materials used in machining ASTM A656/A656M A656 Type 3 Grade 50 steel. However, powder metallurgy high speed steel and CBN/cermet inserts, coated with an AlCrN coating, are also suitable for machining applications. When using carbide and high speed steel cutting tools, two flute and high helix angle tools should be used, as they are more efficient than one flute tools. Additionally, positive rake geometry and a chamfer can provide better chip control and a better finish.