What are the features of A387GR91 steel?

A387GR91 steel is a chromium-molybdenum alloy steel. In the medium temperature ( 350 ～ 480 ℃ ) hydrogen environment. A387 Grade 91 steel has the properties of preventing hydrogen embrittlement, hydrogen corrosion, hydrogen peeling, and sulfide corrosion, and has good low temper embrittlement. It is widely used in the manufacture of fertilizer, petrochemical and thermal power plant equipment, such as ammonia synthesis reactors, coal gasifiers, shift furnaces and hydrogenation reactors.

A387GR91 steel characteristics:

A387GR91 steel is equivalent to the Chinese steel grade 10Cr9Mo1VNbN. It not only has high oxidation resistance and high temperature steam corrosion resistance, but also has good impact toughness and high and stable durable plasticity and thermal strength. When the service temperature is lower than 620℃, its allowable stress is higher than that of austenitic stainless steel. Above 550℃, the recommended design allowable stress is about twice that of T9 and 2.25Cr-1Mo steel.

Application:
A387GR91 steel can be used as high temperature superheater and reheater steel pipe for subcritical and supercritical boiler wall temperature ≤ 625, as well as high temperature header and steam piping for wall temperature ≤ 600. It can also be used as nuclear power heat exchanger and oil cracking unit furnace tube .

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