What is the Difference Between ASME SA 516 GR 70 and A105?

ASME SA 516 GR 70 is a carbon steel plate for pressure vessels, while ASTM A105 is a forged carbon steel for piping components like flanges and fittings.At Gangsteel, we manufacture ASME SA 516 GR 70 plates that integrate seamlessly with A105 forgings for robust pressure systems. This article compares their composition, properties, and applications to clarify their roles in industrial projects.

Overview of SA 516 GR 70 and A105

ASME SA 516 GR 70, equivalent to ASTM A 516 GR 70, is a carbon steel plate specification designed for welded pressure vessels operating at moderate and low temperatures (down to -46°C). It is renowned for its high tensile strength (485-620 MPa) and Hydrogen Induced Cracking (HIC) resistance, making it ideal for oil and gas applications. ASTM A105, on the other hand, is a specification for forged carbon steel components used in high-pressure piping systems, such as flanges, valves, and fittings, suitable for both ambient and high-temperature service.

Gangsteel’s SA 516 GR 70 plates are designed to complement A105 forgings, ensuring strong, reliable welds in composite pressure vessel and piping assemblies.

Chemical Composition Comparison

The chemical compositions of SA 516 GR 70 and A105 reflect their different manufacturing processes (rolling vs. forging):

Gangsteel’s SA 516 GR 70 plates are tested for HIC per NACE TM0284, with sulfur content as low as 0.003%, ensuring reliability in sour gas environments. A105’s slightly higher carbon content supports its forging process, but its weldability aligns well with SA 516 plates.

Mechanical Properties Comparison

The mechanical properties reflect the different applications of plates and forgings:

SA 516 GR 70, as used in ASME SA 516 GR 65, is designed for large-scale pressure vessels, while A105’s forging process makes it ideal for smaller, high-pressure components like flanges.

Manufacturing and Heat Treatment

• SA 516 GR 70: Produced through controlled rolling and normalized at 900-950°C to achieve a fine-grain structure, enhancing toughness and weldability. Stress-relieving at 620-650°C is optional for welded structures.
• A105: Forged at high temperatures and typically normalized at 870-930°C or quenched and tempered, resulting in a dense microstructure for high-pressure piping components.

Gangsteel’s SA 516 GR 70 plates are optimized for welding with A105 forgings, ensuring strong, defect-free joints. Our plates undergo ultrasonic testing (ASTM A435) and Charpy V-notch impact tests to guarantee compatibility.

Applications and Selection Criteria

• SA 516 GR 70 Applications:
  • Oil and Gas: High-pressure pressure vessels and pipelines, especially in sour gas environments requiring HIC resistance.
  • Petrochemical: Reactors and heat exchangers operating at pressures up to 500 bar.
  • Power Generation: Boilers at temperatures up to 450°C, often paired with ASME SA 516 GR 60.
• A105 Applications:
  • Piping Systems: Forged flanges, elbows, and valves in high-pressure oil and gas pipelines.
  • Petrochemical: Fittings for chemical processing equipment.
  • Power Generation: Steam line components requiring high-temperature strength.

Gangsteel’s SA 516 GR 70 plates are designed to integrate with A105 forgings, providing a complete solution for pressure vessel and piping systems. Our plates are available in thicknesses from 6mm to 200mm (custom up to 300mm), ensuring versatility.

Why Choose SA 516 GR 70 with A105?

The combination of SA 516 GR 70 and A105 is ideal for composite systems:

• Complementary Properties: SA 516 GR 70’s high tensile strength and weldability pair well with A105’s forged strength.
• HIC Resistance: SA 516 GR 70’s low sulfur content ensures reliability in sour service, complementing A105’s corrosion resistance.
• Global Standards: Both meet ASME and ASTM requirements, ensuring compliance for international projects.
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Gangsteel’s Commitment to Quality

Gangsteel ensures the quality of our SA 516 GR 70 plates through:

• Testing: Ultrasonic (ASTM A435), HIC (NACE TM0284), and impact tests at -46°C.
• Certifications: MTCs per EN 10204 3.1, verified by SGS and BV.
• Global Supply: Export to over 50 countries with 3-7 day delivery to Asia.

Our plates, such as ASTM A 516 GR 55, are designed for seamless integration with A105 forgings, ensuring robust pressure systems.

Conclusion

ASME SA 516 GR 70 is a carbon steel plate for pressure vessels, offering high tensile strength and HIC resistance, while ASTM A105 is a forged carbon steel for piping components. Gangsteel’s ASME SA 516 GR 70 plates complement A105 forgings, providing reliable solutions for high-pressure systems. Contact Gangsteel for customized plates and competitive pricing to support your projects.

Keywords: ASME SA 516 GR 70 vs A105, carbon steel plates vs forgings, pressure vessel steel, Gangsteel plates