ASTM A656/A656M Type 3 Grade 80 Introduce
ASTM A656/A656M Type 3 Grade 80 sets the requirements for product specifications, including the steel grade, surface finish and chemistry of the alloy. The steel grade includes the chemical composition of the alloy, and notes such as the melting temperature, heat treatment and degassing temperature, as well as the type of coil line used for production. The surface finish requirements for the steel, such as the hisses, surface defects, and surface stability, are also outlined.
Smelting temperature:1926°C - 1198°C
Application:High-strength low-alloy hot-rolled structural steel plate with improved forgeability
ASTM A656/A656M Type 3 Grade 80 Material Chemical Composition
The chemical composition of the ASTM A656/A656M Type 3 Grade 80 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 Type 3 Grade 80 Material Mechanical Properties
Elongation is a measure of a material's ductility; it is a measure of the degree to which a material can be stretched before it fractures or breaks. Elongation is typically measured in a percent format, with higher values denoting more ductile materials that can withstand greater elongation. The minimum elongation for ASTM A656/A656M Type 3 Grade 80 steel is 18%. This value is significantly greater than most other hot-rolled steel grades and indicates that ASTM A656/A656M Type 3 Grade 80 is an excellent choice for components that require stretching without risk of failure.
The mechanical properties of the ASTM A656/A656M Type 3 Grade 80 steel are as follows:
| YieldRp0.2 | ≤ 171 (MPa) |
| TeileRm | ≤ 594 (MPa) |
| ImpactKV/Ku | 31(J) |
| ElongationA | 41% |
| Reduction in cross section on fractureZ | 33% |
| As-Heat-Treated Condition | Solution and Aging, Annealing, Ausaging, Q+T,etc |
| Brinell hardness (HBW) | 214 |
ASTM A656/A656M Type 3 Grade 80 Material Thermal Properties
The thermal performance parameters of the ASTM A656/A656M Type 3 Grade 80 steel are as follows:
| Temperature (°C) | 21 | 866 | 419 |
| Modulus of elasticity (GPa) | - | 773 | - |
| Mean coefficient of thermal expaion ×10-6/(°C) | - | - | 12 |
| Thermal conductivity (W/m·°C) | - | 21.3 | 22.2 |
| Specific thermal capacity (J/kg·°C) | - | 444 | - |
| Specific electrical resistivity (Ω mm²/m) | 0.32 | - | - |
| Deity (kg/dm³) | - | - | 442 |
| Poisson’s coefficient, ν | - | - | 332 |
ASTM A656/A656M Type 3 Grade 80 Material Machining Technology
The cutting parameters for machining ASTM A656/A656M Type 3 Grade 80 steel should be optimized for the specific application, based on the tool material and geometry being used. Generally, cutting speed should be kept between 30 and 100 m/min, and feed rate should range from 0.05 to 0.4 mm/tooth. These parameters should be adjusted depending on the type of operation being performed.