a234 vs a105

ASTM A105

• Material: Forged Carbon Steel.
• Component Type: Primarily for forged components like flanges, fittings, and valves.
• Application: Moderate to high-temperature pressure service.
• Key Feature: Good machinability, weldable with proper procedures. 

ASTM A234

• Material: Carbon and Alloy Steel.
• Component Type: Pipe fittings (elbows, reducers, tees).
• Application: Moderate to high-temperature pressure applications, often butt-welded.
• Grades: Includes various grades like WPB (Weldable, Pressure, Grade B), WPC, WP11, WP22, WP91, etc., indicating different alloys or properties. 

Main Distinction

• A105 is a material specification for forged products (flanges, blocks).
• A234 is a material specification for fittings (elbows, tees, reducers). 

Which to Use?

• Choose A105 for forged components like flanges or threaded fittings.
• Choose A234 (e.g., WPB) for butt-welded fittings like elbows, tees, and reducers in pressure piping systems.