ASTM A516 GR 70 is a carbon steel plate designed for excellent weldability and toughness, particularly in normalized conditions. The chemical composition, as specified by ASTM standards, is tightly controlled to ensure performance in pressure vessel applications.
Mechanical Properties
The mechanical properties of ASTM A516 GR 70 make it ideal for pressure vessels and boilers operating under moderate to low temperatures. Its normalized condition enhances toughness and resistance to thermal stress. The following table summarizes the mechanical properties:
|
Property |
Value |
|---|---|
|
Tensile Strength |
485–620 MPa (70–90 ksi) |
|
Yield Strength (min) |
260 MPa (38 ksi) |
|
Elongation (min, 200 mm) |
17% |
|
Elongation (min, 50 mm) |
21% |
|
Hardness (HB, typical) |
140–200 HB |
|
Impact Toughness (Charpy V-notch) |
Meets ASTM requirements at -46°C |
Highlights:
Tensile Strength: 485–620 MPa ensures durability in high-pressure applications.
Yield Strength: Minimum 260 MPa supports structural integrity in demanding conditions.
Elongation: 17–21% ductility facilitates forming and fabrication without cracking.
Impact Toughness: Excellent performance at low temperatures (down to -46°C), ideal for cryogenic applications.
Compared to ASTM A516 GR 65 and ASTM A516 GR 60, ASTM A516 GR 70 offers superior strength, making it suitable for more robust pressure vessel designs while retaining excellent weldability.
Physical Properties
|
Property |
Value |
|---|---|
|
Density |
7.85 g/cm³ |
|
Melting Point |
~1510°C |
|
Thermal Conductivity |
50 W/m·K (at 20°C) |
|
Specific Heat Capacity |
470 J/kg·K |
Key Notes:
Carbon: Capped at 0.27% to maintain weldability and prevent excessive hardness.
Manganese: Enhances strength and toughness, critical for high-pressure environments.
Phosphorus and Sulfur: Low levels minimize brittleness and improve notch toughness.
Silicon and Aluminum: Ensure the steel is fully killed, reducing gas inclusions and enhancing mechanical properties.
Gangsteel's ASTM A516 GR 70 plates comply with both ASTM and ASME SA516 GR 70 standards, with additional testing available to verify chemical consistency.
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