ASTM A470/A470M-05

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 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.
1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

General Information

• Status: Historical
• Publication Date: 31-Aug-2005
• 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 A470-03 - Standard Specification for Vacuum-Treated Carbon and Alloy Steel Forgings for Turbine Rotors and Shafts
• Effective Date: 01-Sep-2005
• Replaced By: ASTM A470/A470M-05e1 - Standard Specification for Vacuum-Treated Carbon and Alloy Steel Forgings for Turbine Rotors and Shafts
• Effective Date: 01-Sep-2005
• Referred By: ASTM A788/A788M-23 - Standard Specification for Steel Forgings, General Requirements
• Effective Date: 01-Sep-2005
• Referred By: ASTM A418/A418M-15(2020) - Standard Practice for Ultrasonic Examination of Turbine and Generator Steel Rotor Forgings
• 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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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/A 470M – 05
Standard Specification for
Vacuum-Treated Carbon and Alloy Steel Forgings for
1
Turbine Rotors and Shafts
This standard is issued under the fixed designationA 470/A 470M; 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* A 751 Test Methods, Practices andTerminology for Chemi-
cal Analysis of Steel Products
1.1 This specification covers vacuum-treated carbon and
A 788 Specification for Steel Forgings, General Require-
alloy steel forgings for turbine rotors and shafts.
ments
1.2 The values stated in either SI units or inch-pound units
E 139 Test Methods for Conducting Creep, Creep-Rupture,
are to be regarded separately as standard. The values stated in
and Stress-Rupture Tests of Metallic Materials
each system may not be exact equivalents; therefore, each
system shall be used independently of the other. Combining
3. Ordering Information and General Requirements
values from the two systems may result in non-conformance
3.1 Material supplied to this specification shall conform to
with the standard.
the requirements of Specification A 788, which outlines addi-
1.3 This standard does not purport to address all of the
tional ordering information, manufacturing methods and pro-
safety concerns, if any, associated with its use. It is the
cedures, marking, certification, production analysis variations,
responsibility of the user of this standard to establish appro-
and additional supplementary requirements.
priate safety and health practices and determine the applica-
3.2 In addition to the ordering information required by
bility of regulatory limitations prior to use.
Specification A 788, the purchaser shall include with the
2. Referenced Documents inquiry and order, the grade and class of steel, alternative
2
maximum for silicon content (see Table 1), the choice of yield
2.1 ASTM Standards:
strength offset (0.2 or 0.02 %), and any tests, supplementary
A 275/A 275M Test Method for Magnetic Particle Exami-
requirements, and purchase options desired.
nation of Steel Forgings
3.3 Forging Drawing—Each forging shall be manufactured
A 293 Specification for Steel Forgings, Carbon and Alloy,
3
in accordance with a drawing furnished by the purchaser
for Turbine Generator Rotors and Shafts
showing the dimensions of the forging and bore hole, if any,
A 370 Test Methods and Definitions for MechanicalTesting
and the location of mechanical test specimens.
of Steel Products
3.4 Supplementary Requirements—Supplementary require-
A 418 Test Method for Ultrasonic Examination of Turbine
ments are provided. These requirements shall apply only when
and Generator Steel Rotor Forgings
specified in the purchase order.
A 472 Test Method for Heat Stability of Steam Turbine
3.5 If the requirements of this specification are in conflict
Shafts and Rotor Forgings
with the requirements of SpecificationA 788, the requirements
of this specification shall prevail.
1 4. Manufacture
This specification is under the jurisdiction of ASTM Committee A01 on Steel,
Stainless Steel, and RelatedAlloys and is the direct responsibility of Subcommittee
4.1 Melting Process:
A01.06 on Steel Forgings and Billets.
4.1.1 The steel shall be made by the basic electric-furnace
Current edition approved Sept. 1, 2005. Published September 2005. Originally
process.
approved in 1962. Last previous edition approved in 2003 as A 470 – 03.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
4.1.2 Provisions for subsequent secondary melting of the
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
steel by the consumable electrode-electroslag or vacuum-arc
Standards volume information, refer to the standard’s Document Summary page on
remelting processes are included in Supplementary Require-
the ASTM website.
3
Withdrawn. ment S7.
*A Summary of Changes section appears at the end of this standard.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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A 470/A 470M – 05
A
TABLE 1 Chemical Requirements
Grade A Grade B Grade C Grade D Grade E
Ni-Mo-V Ni-Mo-V Ni-Cr-Mo-V Cr-Mo-V Ni-Mo-V
Carbon 0.22–0.30 0.22–0.30 0.28 0.25–0.35 0.30
Manganese 0.20–0.60 0.20–0.60 0.20–0.60 1.00 0.70
Phosphorus 0.012 0.012 0.012 0.012 0.025
Sulfur 0.012 0.012 0.015 0.015 0.025
BBB,CB B
Silicon
Nickel 3.20–3.70 3.20–3.70 3.25–4.00 0.75 2.00 min.
Chromium 0.75 0.75 1.25–2.00 1.05–1.50 0.75
D
Molybdenum 0.40–0.60 0.40–0.60 0.25–0
...