91

Alloy Steel

Chromium-molybdenum alloy steel plates for elevated-temperature welded pressure vessels. Higher Cr/Mo improves creep strength, oxidation and H2S resistance. Grade 91 (9Cr-1Mo-V-Nb martensitic creep-resistant).

Mechanical Properties

Tensile 585-760 MPa Yield 415 MPa min Elong 18% min

Chinese Standard

ASTM A387 / A387M; ASME SA-387

Applications

Welded boilers, pressure vessels, refinery reactors, heat exchangers, high-temp piping

Available Forms

Plate, sheet

Uses

Boilers, pressure vessels, refinery reactors, heat exchangers, high-temp piping

Heat Treatment

Normalize+temper or quench+temper per grade; Grade 91/92 austenitize 1040-1080 C + temper 730-800 C

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