Group 1.10 Pressure-Temperature Ratings

2.25Cr-1Mo alloy steel. The standard refinery heater and reformer material, chosen over Group 1.9 for its better high-temperature creep strength and hydrogen service resistance.

Standard
ASME B16.5
Group
Group 1.10
Materials
A182 F22 Cl. 3, A335 P22, A217 WC9, A387 Gr. 22 Cl. 2
Class 150 at 100 °F
290 psig (20.0 bar)
Class 150 at 600 °F
140 psig (9.7 bar)
ASME B16.5 pressure-temperature ratings for Group 1.10 materials, in psig.
Class100 °F200 °F300 °F400 °F500 °F600 °F650 °F700 °F750 °F800 °F850 °F900 °F950 °F1000 °F
Class 150290260230200170140125110958065503520
Class 300750750730705665605590570530510485450385265
Class 40010001000970940885805785755710675650600515355
Class 6001500150014551410133012101175113510651015975900775535
Class 9002250225021852115199518151765170515951525146013501160800
Class 150037503750364035303325302529402840266025402435224519301335
Class 250062506250607058805540504049054730443042304060374532202230

Interpolation between listed temperatures is permitted; extrapolation is not.

Common questions

Which materials are in ASME B16.5 Group 1.10?

A182 F22 Cl. 3, A335 P22, A217 WC9, A387 Gr. 22 Cl. 2.

What is a Class 300 Group 1.10 flange rated at 600 °F?

605 psig (41.7 bar). At 100 °F the same flange is rated 750 psig (51.7 bar).

Other material groups