What Is ASTM A105 Code?

ASTM A105 is a standard for carbon steel forgings used in piping systems.

It applies to flanges, fittings, and valves built for high-pressure and high-temperature applications.

This code ensures strength, durability, and performance in industrial settings.

A105 Carbon Steel Material

A105 carbon steel, or A105 CS material, is a low-carbon alloy with manganese and silicon.

It’s used in oil and gas, power plants, and industrial piping because it handles pressure well and lasts in tough conditions.

SA105 is the ASME equivalent, following the same specifications and mechanical properties

Mechanical Properties of ASTM A105

A105 steel is designed to handle stress and pressure in demanding environments.

• Tensile Strength: Minimum 70 ksi (485 MPa)
• Yield Strength: Minimum 36 ksi (250 MPa)
• Elongation: Minimum 22%
• Reduction of Area: Minimum 30%
• Hardness: 137-187 HBW

These properties make A105 forgings reliable for pressure piping, valves, and industrial applications.

Chemical Composition and Properties

The effectiveness of A105 comes from its precise material composition. Each element serves a specific purpose in creating reliable industrial components:

Forging and Heat Treatment

A105 carbon steel is forged between 1700°F and 2200°F to shape flanges, fittings, and valves.

After forging, heat treatment may be required to improve mechanical properties.

The common heat treatments include:

• Annealing (A): Reduces hardness and improves machinability.
• Normalizing (N): Refines grain structure and improves strength.
• Quenching and Tempering (QT): Enhances toughness for high-stress applications.

Some parts are labeled ASTM A105N when normalized for extra strength and stability.

Welding and Machining

A105 is easy to weld using standard methods, as long as ASME Section IX welding procedures are followed.

It also machines well, making it ideal for custom fittings and precision components.

Testing and Certification

Some A105 parts undergo hydrostatic testing to check for leaks and pressure resistance.

This is required only when ASTM A961 Supplemental S57 is specified by the manufacturer.

Where Is A105 Used?

A105 carbon steel is built for high-pressure and high-temperature piping systems.

You’ll see it in:

• Flanges: Weld neck, slip-on, blind, and socket weld.
• Fittings: Tees, elbows, couplings, and reducers.
• Valves: Gate valves, check valves, and pressure controls.

These parts keep pipelines running in oil refineries, chemical plants, and power stations.

Conclusion

Now that you understand ASTM A105 specifications for carbon steel forgings, you can better evaluate materials for your high-pressure and high-temperature piping applications.

The relationship between ASTM A105 and its ASME equivalent (SA105) demonstrates how international standards work together to ensure quality and safety in industrial systems.

For high-quality industrial flanges, visit longanflange.com to explore our ASME and stainless steel range.

Reference

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