Tensile Strength of ASTM A516 Gr 70 Boiler Plate

What is Tensile Strength of ASTM A516 Gr 70 Boiler Plate?

As a premier manufacturer and exporter of pressure vessel and boiler steel plates, Gangsteel supplies high-quality ASTM A516 GR 70 steel plates engineered for superior performance in high-pressure and low-temperature environments.

The tensile strength of ASTM A516 GR 70 is a critical factor for engineers and fabricators designing pressure vessels and boilers for industries such as oil and gas,petrochemical, and power generation. This article provides a detailed overview of the tensile strength, related mechanical properties, and applications of ASTM A516 GR 70, ensuring compliance with industry standards.

Tensile Strength and Mechanical Properties

The tensile strength of ASTM A516 GR 70 is a key attribute that makes it ideal for demanding applications. As a normalized carbon steel plate, it offers excellent strength, toughness, and weldability. The following table summarizes its mechanical properties, with a focus on tensile strength, as specified by ASTM standards:

Key Highlights:

• Tensile Strength: Ranging from 485 to 620 MPa (70–90 ksi), ASTM A516 GR 70 provides robust resistance to pressure-induced stresses, making it suitable for boiler and pressure vessel fabrication.
• Yield Strength: A minimum of 260 MPa ensures structural integrity under high-pressure conditions.
• Elongation: 17–21% ductility supports forming and fabrication without compromising strength.
• Impact Toughness: Excellent performance at low temperatures (down to -46°C) ensures reliability in cryogenic applications, such as LNG storage tanks.

The high tensile strength of ASTM A516 GR 70 compared to ASTM A516 GR 65 (450–585 MPa) and ASTM A516 GR 60 (415–550 MPa) makes it the preferred choice for applications requiring enhanced strength and durability.

Chemical Composition Supporting Tensile Strength

The tensile strength of ASTM A516 GR 70 is influenced by its carefully controlled chemical composition, which ensures weldability and toughness. Below is the chemical composition as per ASTM standards:

Key Notes:

• Carbon: Limited to 0.27% to balance strength and weldability, preventing excessive hardness that could reduce ductility.
• Manganese: The 0.85–1.20% range enhances tensile strength and toughness, critical for high-pressure boiler applications.
• Phosphorus and Sulfur: Low levels (0.035% max) minimize brittleness, supporting the material’s high tensile strength and notch toughness.
• Silicon and Aluminum: Ensure the steel is fully killed, improving uniformity and contributing to consistent mechanical properties.

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

Applications of ASTM A516 Gr 70

The high tensile strength of ASTM A516 GR 70 makes it a top choice for:

• Boilers: Used in power generation for components requiring high tensile strength and thermal stability.
• Pressure Vessels: Ideal for oil, gas, and chemical processing due to its ability to withstand high-pressure environments.
• Low-Temperature Service: Suitable for cryogenic applications, such as LNG storage, thanks to its excellent impact toughness.
• Fabrication: Its combination of strength and ductility supports complex forming and welding processes.

Gangsteel ensures that ASME SA516 GR 70 plates are manufactured to meet stringent ASME standards, guaranteeing performance in critical applications.

Comparison with Other Grades

For material selection, comparing ASTM A516 GR 70 with other grades is essential. The table below highlights key differences:

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

Weldability and Processing

The tensile strength of ASTM A516 GR 70 is complemented by its excellent weldability, owing to its low carbon content and fully killed nature. It supports standard welding processes (SMAW, GTAW, SAW) with minimal risk of weld imperfections. Normalization further enhances its grain structure, improving both strength and toughness. Gangsteel offers ASTM A516 GR 70 in hot-rolled or normalized conditions to meet specific fabrication requirements.

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 tensile strength verification to meet ASTM/ASME standards.
• Customization: Available in various thicknesses and finishes to suit project needs.
• Global Supply: Competitive pricing and reliable delivery for industries worldwide.
• Technical Expertise: Guidance on selecting ASTM A516 GR 70 versus ASTM A516 GR 65, ASTM A516 GR 60, or ASTM A516 GR 55.

Conclusion

The tensile strength of ASTM A516 GR 70, ranging from 485–620 MPa, combined with its excellent weldability and low-temperature toughness, makes it a premier choice for boiler and pressure vessel applications. Gangsteel’s ASME SA516 GR 70 plates are manufactured to the highest standards, ensuring reliability and performance. For more on equivalent standards, explore our ASME SA516 GR 70 Equivalent Grade guide.