ASTM A105 and ASME SA105 are essentially the same material specification, but there is a key difference between them, primarily related to standards and the organization that publishes them.
Comparison: ASTM A105 vs ASME SA105
| Specification | ASTM A105 | ASME SA105 |
|---|---|---|
| Material Type | Carbon steel for forged flanges, fittings, and valves. | Same as A105, carbon steel for forged flanges, fittings, and valves. |
| Standard Organization | Published by ASTM International. | Published by ASME (American Society of Mechanical Engineers). |
| Scope of Use | Used for forged carbon steel piping components. | Used for forged carbon steel piping components. |
| Chemical Composition | Same as SA105, with standard carbon and alloy content. | Identical chemical composition to ASTM A105. |
| Mechanical Properties | Identical mechanical properties as SA105. | Identical mechanical properties as ASTM A105. |
| Applications | Primarily for flanges, fittings, and valves used in high-pressure and high-temperature systems. | Same applications as A105 in high-pressure and high-temperature piping systems. |
| Difference | Published by ASTM for use in a wider range of applications. | Published by ASME for pressure piping and high-temperature applications. |
| Welding and Forging | Excellent weldability and forging properties for industrial applications. | Same weldability and forging properties as ASTM A105. |
Key Differences:
ASTM A105: Published by ASTM (American Society for Testing and Materials), a standard used widely in various industries.
ASME SA105: Published by ASME (American Society of Mechanical Engineers), used specifically for pressure-containing applications like boilers and pressure vessels in line with ASME codes.
Summary:
ASTM A105 and ASME SA105 are almost identical in terms of material composition and mechanical properties.
The difference lies in the standard organization-ASTM A105 is used more broadly, while ASME SA105 is typically referenced in pressure equipment and vessel codes as governed by ASME standards.
In practice, both specifications are often used interchangeably, but the reference to ASME SA105 is more specific to pressure-related applications.
