ASTM A516 Gr 70 for Pressure Vessel Steel Plate

Gangsteel, a leading manufacturer and exporter of pressure vessel and boiler steel plates, supplies premium ASTM A516 GR 70 steel plates engineered for high-pressure and low-temperature applications. Widely used in industries such as oil and gas, petrochemical, and power generation, ASTM A516 GR 70 is a preferred choice for pressure vessel fabrication due to its excellent strength, toughness, and weldability. This article details its chemical composition, mechanical properties, and key applications, providing essential information for engineers and fabricators.

Chemical Composition

The chemical composition of ASTM A516 GR 70 is carefully controlled to ensure weldability, toughness, and resistance to brittle fracture, making it ideal for pressure vessel steel plates. The table below outlines its composition per ASTM standards:

Key Notes:

• Carbon: Limited to 0.27% to ensure weldability and prevent excessive hardness, critical for pressure vessel applications.
• Manganese: The 0.85–1.20% range enhances strength and toughness under high-pressure conditions.
• Phosphorus and Sulfur: Low levels (0.035% max) improve notch toughness, essential for low-temperature performance.
• Aluminum: Ensures the steel is fully killed, reducing gas inclusions and enhancing uniformity.

Gangsteel’s ASTM A516 GR 70 plates comply with ASME SA516 GR 70 standards, with rigorous testing to verify chemical consistency.

Mechanical Properties

ASTM A516 GR 70 is typically supplied in a normalized condition, enhancing its toughness and suitability for pressure vessels. The table below summarizes its mechanical properties:

Highlights:

• Tensile Strength: The 485–620 MPa range ensures durability in high-pressure environments, ideal for pressure vessel steel plates.
• Yield Strength: A minimum of 260 MPa supports structural integrity under stress.
• Elongation: 17–21% ductility allows for fabrication without cracking.
• Impact Toughness: Excellent performance at low temperatures (down to -46°C) makes it suitable for cryogenic pressure vessels.

Compared to ASTM A516 GR 65 (450–585 MPa) and ASTM A516 GR 60 (415–550 MPa), ASTM A516 GR 70 offers superior strength for more demanding pressure vessel applications.

Applications

ASTM A516 GR 70 is a cornerstone material for pressure vessel fabrication due to its robust properties. Key applications include:

• Pressure Vessels: Used in oil and gas processing, chemical reactors, and LNG storage tanks, where high strength and low-temperature toughness are critical.
• Boilers: Essential for power generation, providing thermal stability and durability under high-pressure conditions.
• Cryogenic Equipment: Suitable for low-temperature applications due to its excellent impact toughness.
• Industrial Fabrication: Its weldability and formability support complex assemblies in pressure vessel manufacturing.

Gangsteel’s ASME SA516 GR 70 plates are manufactured to meet ASME standards, ensuring compliance for global pressure vessel projects.

Weldability

ASTM A516 GR 70 is fully killed carbon steel, offering excellent weldability with standard processes such as SMAW, GTAW, and SAW. Its low carbon content minimizes weld imperfections, while normalization enhances grain structure for improved toughness. Gangsteel provides plates in normalized or hot-rolled conditions to meet specific fabrication requirements for pressure vessels.

Comparison with Other A516 Grades

To aid material selection, the table below compares ASTM A516 GR 70 with other A516 grades:

For global equivalents, such as EN P355GH, refer to Gangsteel’s ASME SA516 GR 70 Equivalent Grade guide.

Why Choose Gangsteel?

Gangsteel is a global leader in supplying ASTM A516 GR 70 and ASME SA516 GR 70 plates, offering:

• Certified Quality: Plates undergo ultrasonic testing, Charpy impact tests, and chemical analysis to meet ASTM/ASME standards.
• Customization: Available in various thicknesses and normalized conditions for pressure vessel fabrication.
• Global Supply: Competitive pricing and reliable delivery for industries worldwide.
• Technical Support: Expert guidance on selecting ASTM A516 GR 70 versus ASTM A516 GR 65, ASTM A516 GR 60, or ASTM A516 GR 55.

Gangsteel Solution

ASTM A516 GR 70 is a high-performance steel plate optimized for pressure vessel applications, offering exceptional strength, toughness, and weldability. Gangsteel’s ASME SA516 GR 70 plates ensure reliability for demanding projects. For more on equivalent standards, explore our ASME SA516 GR 70 Equivalent Grade guide.