ASTM A470-03

Standard Specification for Vacuum-Treated Carbon and Alloy Steel Forgings for Turbine Rotors and Shafts

SCOPE
1.1 This specification covers vacuum-treated carbon and alloy steel forgings for turbine rotors and shafts.
1.2 The values stated in inch-pound units are to be regarded as the standard. The values given in parentheses are for information only.

General Information

• Status: Historical
• Publication Date: 09-Apr-2003
• ICS: 77.140.85 - Iron and steel forgings
• Technical Committee: A01 - Steel, Stainless Steel and Related Alloys
• Drafting Committee: A01.06 - Steel Forgings and Billets

Relations

• Replaces: ASTM A470-01 - Standard Specification for Vacuum-Treated Carbon and Alloy Steel Forgings For Turbine Rotors and Shafts
• Effective Date: 10-Apr-2003
• Replaced By: ASTM A470/A470M-05 - Standard Specification for Vacuum-Treated Carbon and Alloy Steel Forgings for Turbine Rotors and Shafts
• Effective Date: 01-Sep-2005

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn. Contact ASTM
International (www.astm.org) for the latest information.
Designation: A 470 – 03
Standard Specification for
Vacuum-Treated Carbon and Alloy Steel Forgings for
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Turbine Rotors and Shafts
This standard is issued under the fixed designation A 470; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the Department of Defense.
1. Scope* maximum for silicon content (see Table 1), the choice of yield
strength offset (0.2 or 0.02 %) and any tests, supplementary
1.1 This specification covers vacuum-treated carbon and
requirements, and purchase options desired.
alloy steel forgings for turbine rotors and shafts.
3.3 Forging Drawing—Each forging shall be manufactured
1.2 The values stated in inch-pound units are to be regarded
in accordance with a drawing furnished by the purchaser
as the standard. The values given in parentheses are for
showing the dimensions of the forging and bore hole, if any,
information only.
and the location of mechanical test specimens.
2. Referenced Documents 3.4 Supplementary Requirements—Supplementary require-
ments are provided. These requirements shall apply only when
2.1 ASTM Standards:
specified in the purchase order.
A 275/A 275M Test Method for Magnetic Particle Exami-
2
3.5 If the requirements of this specification are in conflict
nation of Steel Forgings
with the requirements of SpecificationA 788, the requirements
A 370 Test Methods and Definitions for MechanicalTesting
3
of this specification shall prevail.
of Steel Products
A 418 Test Method for Ultrasonic Examination of Turbine
4. Manufacture
2
and Generator Steel Rotor Forgings
4.1 Melting Process:
A 472 Test Method for Heat Stability of Steam Turbine
2
4.1.1 The steel shall be made by the basic electric-furnace
Shafts and Rotor Forgings
process.
A 751 Test Methods, Practices andTerminology for Chemi-
3
4.1.2 Provisions for subsequent secondary melting of the
cal Analysis of Steel Products
steel by the consumable electrode-electroslag or vacuum-arc
A 788 Specification for Steel Forgings, General Require-
2
remelting processes are included in Supplementary Require-
ments
ment S7.
E 139 Test Methods for Conducting Creep, Creep-Rupture,
4
4.2 Vacuum Treatment—The vacuum degassing require-
and Stress-Rupture Tests of Metallic Materials
ments of Specification A 788 are mandatory.
3. Ordering Information and General Requirements
4.3 Discard—Sufficient discard shall be taken from each
ingot to secure freedom from pipe and harmful segregation in
3.1 Material supplied to this specification shall conform to
the finished forging.
the requirements of Specification A 788, which outlines addi-
4.4 Forging Process—The forging shall receive its hot
tional ordering information, manufacturing methods and pro-
mechanical work under a press of ample power to adequately
cedures, marking, certification, production analysis variations,
work the metal throughout the maximum section of the
and additional supplementary requirements.
forging. It is important to maintain the axial center of the
3.2 In addition to the ordering information required by
forging in common with the axial center of the ingot.
Specification A 788, the purchaser shall include with the
4.5 Heat Treatment:
inquiry and order, the grade and class of steel, alternative
4.5.1 After forging and before reheating for heat treatment
for mechanical properties, the forging shall be allowed to cool
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This specification is under the jurisdiction of ASTM Committee A01 on Steel,
in a manner designed to prevent injury and accomplish
Stainless Steel, and RelatedAlloys and is the direct responsibility of Subcommittee
transformation.
A01.06 on Steel Forgings and Billets.
4.5.2 The heat treatment for mechanical properties shall
Current edition approved Apr. 10, 2003. Published June 2003. Originally
consist of double-normalizing and tempering for Grades A, B,
approved in 1962. Last previous edition approved in 2001 as A 470 – 01.
2
Annual Book of ASTM Standards, Vol 01.05.
D, and E and normalizing, quenching, and tempering for Grade
3
Annual Book of ASTM Standards, Vol 01.03.
C. In normalizing treatments, the forging may be cooled in still
4
Annual Book of ASTM Standards, Vol 03.01.
*A Summary of Changes section appears at the end of this standard.
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn. Contact ASTM
International (www.astm.org) for the latest information.
A 470–03
A
TABLE 1 Chemical R
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