ASTM A656/A656M Type 7 Grade 60 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 Type 7 Grade 60 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:1671°C - 1348°C
Application:High-strength low-alloy hot-rolled structural steel plate with improved forgeability
ASTM A656/A656M Type 7 Grade 60 Material Chemical Composition
The chemical composition of the ASTM A656/A656M Type 7 Grade 60 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) | - | 0.1500 |
| Nitrogen (N) | - | 0.0300 |
| Niobium (Nb) | - | 0.1000 |
| Sulfur (S) | - | 0.0350 |
| Niobium (Nb) | - | 0.1000 |
ASTM A656/A656M Type 7 Grade 60 Material Mechanical Properties
Tests are conducted to verify the mechanical properties, such as the yield strength, tensile strength, and elongation, of the ASTM A656/A656M Type 7 Grade 60 steel, as required by the standard. There are several types of tests that can be used to verify the material's properties, including Charpy V-notch impact testing and mechanical property testing. The Charpy V-notch test is used to evaluate the toughness of the steel; a high toughness translates to a higher resistance to deformation. Mechanical property testing is used to evaluate the material's tensile strength, yield strength, and elongation, as well as its ductility, resistance to shrinking and thermal expansion, and other properties.
The mechanical properties of the ASTM A656/A656M Type 7 Grade 60 steel are as follows:
| YieldRp0.2 | ≤ 927 (MPa) |
| TeileRm | ≤ 334 (MPa) |
| ImpactKV/Ku | 23(J) |
| ElongationA | 34% |
| Reduction in cross section on fractureZ | 12% |
| As-Heat-Treated Condition | Solution and Aging, Annealing, Ausaging, Q+T,etc |
| Brinell hardness (HBW) | 222 |
ASTM A656/A656M Type 7 Grade 60 Material Thermal Properties
The thermal performance parameters of the ASTM A656/A656M Type 7 Grade 60 steel are as follows:
| Temperature (°C) | 11 | 287 | 983 |
| Modulus of elasticity (GPa) | - | 561 | - |
| Mean coefficient of thermal expaion ×10-6/(°C) | - | - | 14 |
| Thermal conductivity (W/m·°C) | - | 23.3 | 11.2 |
| Specific thermal capacity (J/kg·°C) | - | 423 | - |
| Specific electrical resistivity (Ω mm²/m) | 0.43 | - | - |
| Deity (kg/dm³) | - | - | 324 |
| Poisson’s coefficient, ν | - | - | 443 |
ASTM A656/A656M Type 7 Grade 60 Material Machining Technology
ASTM A656/A656M Type 7 Grade 60 steel is a type of low alloy high strength structural steel. It has a minimum yield strength of 460 MPa, an ultimate tensile strength of 690 MPa, and a minimum elongation of 22%. Machining ASTM A656/A656M Type 7 Grade 60 steel requires the use of specialized tools and techniques, as it is much more challenging to work with than traditional steels.