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ASTM A940

1996 Edition, September 10, 1996

Complete Document

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

Includes all amendments and changes through Reapproval Notice , 2001


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Detail Summary

Superseded By: ASTM A940/A940M

EN
Additional Comments:
W/D S/S BY ASTM A940/A940M
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Product Details:

  • Revision: 1996 Edition, September 10, 1996
  • Published Date: January 2001
  • Status: Superseded By:
  • Superseded By: ASTM A940/A940M
  • Document Language: English
  • Published By: ASTM International (ASTM)
  • Page Count: 4
  • ANSI Approved: Yes
  • DoD Adopted: No

Description / Abstract:

1. Scope

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.