A516Gr70 and P355GH Pressure Vessel Steel Comparison

Material Overview

A516Gr70: A carbon steel plate (ASTM A516/A516M) designed for moderate to low-temperature pressure vessels. Grade 70 is widely used for its strength and ASME certification.
P355GH: A non-alloy steel (EN 10028-2) optimized for high-temperature applications, common in European boiler and vessel manufacturing.

Key Properties

Chemical Composition: A516Gr70 has higher carbon (0.27% max) and lower manganese (0.85–1.20%) than P355GH (carbon 0.10–0.22%, manganese 1.00–1.70%). P355GH's lower sulfur (0.015% max vs. 0.035%) enhances weldability.
Mechanical Properties: A516Gr70 offers a yield strength of 260 MPa and tensile strength of 485–620 MPa, ideal for high-pressure environments. P355GH provides a yield strength of 355 MPa and tensile strength of 510–650 MPa, suited for elevated temperatures.
Temperature Performance: A516Gr70 excels in low to moderate temperatures (-50°C to 200°C), while P355GH resists oxidation and creep up to 400°C.
Weldability: Both are highly weldable, but P355GH's lower sulfur reduces weld imperfections, and A516Gr70 may need preheating for thicker sections.

Applications

A516Gr70: Preferred in North America, the Middle East, and Asia for oil and gas tanks, boilers, and low-temperature vessels due to its ASME certification and global availability.
P355GH: Common in Europe for high-temperature boilers, heat exchangers, and chemical equipment, aligning with EN standards.

Selection Considerations

Operating Conditions: Choose A516Gr70 for high-pressure, low-temperature applications and P355GH for high-temperature environments.
Standards: A516Gr70 meets ASME requirements, critical for North American projects. P355GH complies with European PED standards.
Availability: A516Gr70 is more globally accessible, often cost-effective. P355GH is prevalent in Europe.

A516Gr70 is ideal for high-pressure, low-temperature vessels with global applicability, while P355GH suits high-temperature European projects. Consider operating conditions, standards, and availability to select the best material for safety and performance.

A516Gr70P355GH