ASTM A105 Carbon Steel Forgings Testing

Scope

ASTM A105 testing covers verification of forged carbon steel piping components against the chemical, mechanical, and metallurgical requirements of the specification. The testing confirms that the component meets the limits required for use in ambient- and elevated-temperature pressure piping service.

Key aspects of the testing scope include:

• Chemical composition – verification of carbon, manganese, phosphorus, sulfur, silicon, and the residual/alloy elements against the specification limits, including calculation of the carbon equivalent (CE), which governs weldability
• Tensile properties – tensile strength, yield strength, and elongation determined per ASTM A370 to confirm the material meets the minimum mechanical requirements
• Hardness – hardness testing (typically Brinell) against the specified maximum, which relates to both machinability and the controlled strength of the component
• Heat treatment condition – verification that the component was supplied in the required condition; certain sizes and applications require the forging to be heat treated (annealed, normalized, or normalized and tempered)
• Excluded items – the specification does not cover tube sheets or hollow cylindrical forgings for pressure vessel shells
• Units – results reported in inch-pound units with SI equivalents

Applications

• Pressure piping components – verification of forged flanges, fittings, valve bodies, and connectors used in pressurized piping systems in process and energy industries
• Oil and gas industry – testing of A105 components used in upstream, midstream, and downstream piping where pressure-containing integrity is essential
• Petrochemical and chemical processing – confirming forged components meet A105 requirements for service in process piping systems
• Power generation – verification of carbon steel forged piping components used in power plant piping operating at ambient and elevated temperatures
• Incoming material verification – confirming that purchased A105 components match their material certification before installation in a pressure system
• Component qualification – establishing that a forging supplier’s product meets the full A105 requirement set before approval
• Failure investigation support – verifying whether an A105 component met its specified chemistry and properties as part of investigating a piping failure

Benefits

• Confirms fitness for pressure service – A105 testing verifies the combination of chemistry, strength, ductility, and condition needed for a forged component to be used safely in a pressure piping system
• Carbon equivalent verification supports weldability – because A105 components are frequently welded into piping, confirming the carbon equivalent is within limits is essential to ensure the component can be welded without cracking
• Covers the full requirement set in one engagement – chemical, tensile, hardness, and heat-treatment verification can be performed together to fully qualify a component against the specification
• Supports material acceptance and traceability – testing provides the documented evidence needed to accept A105 components and maintain traceability in regulated pressure-system applications
• Recognized industry specification – A105 is a widely accepted reference for carbon steel piping forgings, so verification against it provides a consistent, accepted basis for component acceptance across the supply chain