A516 Grade 70 is a type of carbon steel plate widely used for pressure vessel applications. It is known for its good combination of strength and toughness, which allows it to perform reliably under high pressures and fluctuating temperatures. The steel is carefully controlled to ensure excellent weldability, making it a preferred choice for fabricating large and complex vessels in the oil, gas, and chemical industries. Its ability to resist brittle fracture, even at lower temperatures, also makes it suitable for low-temperature service and storage tanks. Overall, it is a versatile and dependable material commonly specified for critical equipment that requires high integrity and long-term performance.
| Component Elements Properties | Metric | English | Comments |
|---|---|---|---|
| Carbon, C | 0.31 % | 0.31 % | may vary with plate thickness |
| Iron, Fe | 98.315 % | 98.315 % | as balance |
| Manganese, Mn | 0.85 - 1.2 % | 0.85 - 1.2 % | |
| Phosphorus, P | 0.035 % | 0.035 % | |
| Silicon, Si | 0.15 - 0.40 % | 0.15 - 0.40 % | |
| Sulfur, S | 0.040 % | 0.040 % |
| Mechanical Properties | Metric | English | Comments |
|---|---|---|---|
| Tensile Strength, Ultimate | 485 - 620 MPa | 70300 - 89900 psi | |
| Tensile Strength, Yield | 260 MPa | 37700 psi | |
| Elongation at Break | 17 % | 17 % | in 200mm |
| 21 % | 21 % | in 50mm | |
| Modulus of Elasticity | 200 GPa | 29000 ksi | Typical Carbon Steel |
| Bulk Modulus | 160 GPa | 23200 ksi | Typical for Steel |
| Poissons Ratio | 0.29 | 0.29 | Typical Carbon Steel |
| Shear Modulus | 80.0 GPa | 11600 ksi | Typical for Steel |
applications
Pressure Vessels
A516 Grade 70 is widely used for fabricating pressure vessels in the oil, gas, and petrochemical industries. It is suitable for vessels that store or process liquids and gases under high pressure and temperature, including reactors, separators, and process vessels.
Boilers and Heat Exchangers
This grade is commonly employed in power generation and industrial heating systems. It is used for boiler drums, headers, and heat exchanger components where resistance to thermal stress and elevated temperatures is essential.
Storage Tanks
It is a preferred material for large storage tanks designed to hold crude oil, refined petroleum products, and chemicals. It is often specified for tanks built to industry standards, providing good structural integrity and resistance to environmental loads.
Cryogenic Equipment
Due to its excellent toughness at low temperatures, A516 Grade 70 is used in cryogenic storage and processing equipment. It is suitable for LPG, LNG, and other low-temperature applications where resistance to brittle fracture is critical.
Industrial Machinery and Piping
The steel is used in various heavy industrial components such as compressors, pressure piping, and process equipment. Its combination of strength and weldability makes it ideal for systems that require reliable performance under demanding conditions.
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What is the difference between A516 grade 60 and grade 70?
ASTM A516 Grade 70 offers higher strength (tensile & yield) than Grade 60, making it suitable for higher pressure/temperature applications, while Grade 60 provides better ductility for moderate conditions, with Grade 70 typically having slightly higher carbon and manganese content to achieve its increased strength, though both remain excellent for boilers and pressure vessels.
What is a 516 GR 70 equivalent to?
Common equivalents include ASME SA516 GR 70, EN 10028 P355GH, and BS1501 224-490 A & B, suitable for similar pressure vessel applications.
How is the weldability of A516 Grade 70?
A516 Grade 70 has excellent weldability and can be welded using standard methods such as SMAW, GMAW, FCAW, and SAW. Preheat may be required for thicker plates or in cold weather to prevent hydrogen cracking.
Does A516 Grade 70 require heat treatment?
It is commonly supplied in the normalized condition to ensure good toughness. Post‑weld heat treatment (PWHT) may be specified based on thickness, material toughness requirements, and design code rules.