ASTM A940/A940M-06

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

STANDARD published on 1.3.2006

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The information about the standard:

Designation standards: ASTM A940/A940M-06
Note: WITHDRAWN
Publication date standards: 1.3.2006
SKU: NS-4907
The number of pages: 4
Approximate weight : 12 g (0.03 lbs)
Country: American technical standard
Category: Technical standards ASTM

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Annotation of standard text ASTM A940/A940M-06 :

Keywords:
differential heat treatment, steel forgings, turbine rotor, vacuum treated steel, ICS Number Code 77.140.85 (Iron and steel forgings)

Additional information

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 either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard.

2. Referenced Documents

A788/A788M-23	Standard Specification for Steel Forgings, General Requirements
A418/A418M-15(2020)	Standard Practice for Ultrasonic Examination of Turbine and Generator Steel Rotor Forgings
A470/A470M-05(2020)	Standard Specification for Vacuum-Treated Carbon and Alloy Steel Forgings for Turbine Rotors and Shafts
A472/A472M-23	Standard Specification for Heat Stability of Steam Turbine Shafts and Rotor Forgings
A370-23	Standard Test Methods and Definitions for Mechanical Testing of Steel Products
E139-11(2018)	Standard Test Methods for Conducting Creep, Creep-Rupture, and Stress-Rupture Tests of Metallic Materials
A275/A275M-23	Standard Practice for Magnetic Particle Examination of Steel Forgings

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