What is the temperature range for ASTM A516 Grade 70?
SA 516 Gr 70 operates effectively from very low temperatures, often down to -46°C (-50°F), due to its excellent notch toughness, making it great for cryogenic service, while its upper limit is around 538°C (1000°F) for non-corrosive applications, though maximum allowable service temperatures can be lower (e.g., 371°C-454°C) depending on the specific ASME code section and application.
ASTM A516 Grade 70 is a low-alloy carbon steel plate intended for pressure vessels and boiler applications. It combines moderate to high tensile strength, excellent weldability, and low-temperature toughness, making it suitable for industrial applications under moderate to high pressure and sub-zero temperature conditions.
Key Characteristics
Yield strength: 260–350 MPa
Tensile strength: 485–620 MPa
Elongation: ≥21%
Impact-tested at -29°C
Good weldability and formability
Suitable for moderate-pressure service
Grade Designation
ASTM A516/A516M
Grade 70
Low-alloy steel for pressure service
Carbon equivalent low for welding
Thickness range 6–150 mm
Recognized internationally for industrial boilers
Comparison: ASTM A516 Grade 70 vs Q345R
Yield strength: Q345R slightly higher (≥345 MPa).
Cold impact: A516 Grade 70 better at -29°C.
Weldability: Q345R easier due to lower carbon.
Standard: A516 Grade 70 follows ASTM; Q345R follows GB.
Common Application
Steam boilers
Moderate-pressure tanks
Pressure vessels
Heat exchangers
Petrochemical and chemical plants
Power generation facilities requiring low-temperature toughness
What industries commonly use A516 Grade 70?
It is widely used in power generation, petrochemical, chemical processing, and industrial plants. Applications include steam boilers, moderate-pressure vessels, heat exchangers, and storage tanks. Its combination of strength, ductility, and low-temperature toughness ensures safe and reliable operation in industrial facilities.
What is the yield strength of A516 Grade 70?
Yield strength ranges from 260–350 MPa, providing adequate resistance to permanent deformation. Combined with ductility, it ensures safe operation in boilers, pressure vessels, and storage tanks, allowing reliable fabrication, installation, and long-term service in moderate-pressure industrial applications.
What are common applications of A516 Grade 70?
Common applications include industrial boilers, pressure vessels, heat exchangers, storage tanks, and petrochemical vessels. Its tensile strength, ductility, and low-temperature impact toughness allow safe handling of pressure and temperature variations, making it widely used in power generation, chemical, and petrochemical industries.
Chemical Composition of ASTM A516 GR 70 and Equivalent Materials
|
Standard/Grade |
C (Max %) |
Si (%) |
Mn (%) |
P (Max %) |
S (Max %) |
Ni (Max %) |
Cr (Max %) |
Mo (Max %) |
|---|---|---|---|---|---|---|---|---|
|
ASTM A516 GR 70 |
0.27 |
0.15–0.40 |
0.85–1.20 |
0.035 |
0.035 |
0.40 |
0.30 |
0.08 |
Mechanical Properties of ASTM A516 GR 70
|
Standard/Grade |
Thickness |
Yield Strength (Min MPa) |
Tensile Strength (MPa) |
Elongation (Min %) |
Impact Toughness (Optional) |
|---|---|---|---|---|---|
|
ASTM A516 GR 70 |
6–40mm |
260 |
485–620 |
21% |
Charpy V-notch at -20°C/-46°C |
|
40–100mm |
260 |
485–620 |
17% |
1. Can A516 Grade 70 be machined or formed?
Yes, ASTM A516 Grade 70 can be rolled, cut, and machined using standard industrial equipment. Its good ductility and moderate tensile strength allow fabrication into boilers, tanks, and pressure vessels. Proper tooling ensures uniform thickness and smooth edges, reducing stress concentration and cracking risks, ensuring reliable operation under moderate to high-pressure service.
2. What is ASTM A516 Grade 70?
It is a high-strength, low-alloy carbon steel plate for pressure vessels, boilers, and storage tanks. It offers high tensile strength, ductility, and impact toughness at low temperatures, meeting ASTM A516/A516M standards. Widely used in petrochemical, chemical, and power generation industries, it ensures safe operation under moderate to high-pressure conditions.
3.How does A516 Grade 70 differ from A516 Grade 65?
Grade 70 has higher tensile and yield strength than Grade 65 while maintaining similar ductility and weldability. It is preferred for higher-pressure or low-temperature applications, providing enhanced mechanical performance and structural safety for boilers, pressure vessels, and storage tanks.
4.Is protective coating required for A516 Grade 70?
Protective coating is recommended in humid, outdoor, or corrosive environments. Common coatings include paint, epoxy lining, or galvanizing. While indoor use may not require coating, surface protection improves durability, reduces maintenance, and enhances safety for industrial boilers, pressure vessels, and storage tanks under moderate to high-pressure conditions.
5. What is the tensile strength of A516 Grade 70?
Tensile strength ranges from 485–620 MPa, providing resistance to internal pressure and stress. Combined with ductility, it ensures safe fabrication and operation of boilers, heat exchangers, and storage tanks, making A516 Grade 70 suitable for industrial applications with moderate to high pressures and varying temperatures.
6. Can A516 Grade 70 be used at low temperatures?
Yes, it is impact-tested at -29°C, providing excellent low-temperature toughness. This prevents brittle fracture in cold environments, making it suitable for industrial boilers, storage tanks, and pressure vessels operating under sub-zero conditions in petrochemical, chemical, and power industries.
7. How is A516 Grade 70 tested for quality?
ASTM A516 Grade 70 undergoes tensile testing, impact testing (-29°C), and visual inspections. Thickness, yield, tensile strength, and elongation are verified. Proper quality control ensures mechanical performance, low-temperature toughness, and weldability, guaranteeing safe operation in boilers, pressure vessels, and moderate-pressure storage tanks.
If you want to learn more about ASTM A516 GR 70 GNEE's products, you can send an email toinfo@gneesteels.com . We are more than happy to assist you.
