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ASTM A940-96

Current Revision

Standard Specification for Vacuum Treated Steel Forgings, Alloy, Differentially Heat Treated, for Turbine Rotors

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1.1 This specification covers vacuum treated, alloy steel forgings, differentially heat treated for turbine rotors.

1.2 Differential heat treatment of a rotor forging involves subjecting two portions of the forging concurrently to two different austenitizing temperatures followed by two different cooling rates for normalizing and quenching, and then tempering, to achieve creep resistance in the high pressure (HP) portion and high toughness in the low pressure (LP) portion.

1.3 The values stated in inch-pound units are to be regarded as the standard. The values given in parentheses are for information only.


SDO ASTM: ASTM International
Document Number A940
Publication Date Sept. 10, 1996
Language en - English
Page Count 4
Revision Level 96
Supercedes
Committee A01.06
Publish Date Document Id Type View
Sept. 10, 1996 A0940-96 Revision
Sept. 10, 1996 A0940-96R01 Reaffirmation