Dipti Metal Industries is a global leader in manufacturing and supplying ASTM A234 WP9 (Class 1 & Class 3), UNS K90941 alloy steel components used in high-temperature service. Our offerings include seamless and welded pipes, elbows, tees, reducers, forged flanges, and pressure vessel plates made from A335 P9, A182 F9, and A387 Gr.9 equivalents.

What is WP9 / UNS K90941?

UNS K90941 corresponds to Chrome-Molybdenum Alloy Steel Grade 9, used in elevated temperature applications. It meets the following international standards:

• ASTM A234 WP9 – Buttweld Pipe Fittings (Cl.1 & Cl.3)
• ASTM A335 P9 – Seamless Alloy Steel Pipe
• ASTM A182 F9 – Forged Fittings and Flanges
• ASTM A387 Gr.9 – Pressure Vessel Plates

Applications of WP9 / K90941

• Steam pipelines and boiler tubes
• Refinery and power plant piping
• High-pressure and high-temperature fluid systems
• Petrochemical equipment and pressure vessels
• Furnace, superheater and reheater service

Product Range – WP9 / UNS K90941

Buttweld Pipe Fittings (ASTM A234 WP9 Cl.1 & Cl.3)

We manufacture elbows, reducers, tees, crosses, stub ends in Class 1 and Class 3 variants. Available in schedules 40 to 160 and XXS for seamless and welded use.

Alloy Steel Pipes (ASTM A335 P9)

Seamless alloy steel pipes suitable for high-temperature applications in power plants, refineries and chemical industries.

Forged Flanges & Fittings (ASTM A182 F9)

Weld neck, socket weld, blind, threaded flanges and high-pressure forged elbows, couplings, bushings in F9 grade.

Pressure Vessel Plates (ASTM A387 Gr.9)

Chrome-moly plates for fabrication of boilers and pressure vessels subjected to elevated temperatures.