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Description of ASTM-A471 2009ASTM A471 / A471M - 09Standard Specification for Vacuum-Treated Alloy Steel Forgings for Turbine Rotor Disks and WheelsActive Standard ASTM A471 / A471M | Developed by Subcommittee: A01.06 Book of Standards Volume: 01.05 ASTM A471 / A471MAbstract This specification covers vacuum-treated alloy steel forgings intended for use as turbine rotor disks and wheels. The steel shall be made by the basic electric-furnace process. The molten steel shall be vacuum treated using either the vacuum stream degassing process, vacuum-lift process or ladle degassing process prior to or during the pouring of the ingot in order to remove objectionable gases, particularly hydrogen. The forgings shall receive their hot mechanical work under a press, hammer, or mill of sufficient power to work the metal throughout its section. Before reheating for heat treatment, the forging shall be allowed to cool in a manner to prevent damage and to accomplish transformation. The forgings shall be heated to a suitable temperature for a sufficient length of time for complete austenitization and shall be tempered to develop the specified properties. The forgings shall be preliminarily machined on all surfaces prior to heat treatment and shall be stress relieved after machining. To measure some mechanical properties, the specimens shall be subjected to tension test, impact test, and hardness test. A non-destructive test like an ultrasonic inspection shall be made on all available surfaces to demonstrate freedom from detrimental internal indications. This abstract is a brief summary of the referenced standard. It is informational only and not an official part of the standard; the full text of the standard itself must be referred to for its use and application. ASTM does not give any warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up to date. 1. Scope 1.1 This specification covers vacuum-treated alloy steel forgings intended for use as turbine rotor disks and wheels. 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.
ASTM Standards A275/A275M Practice for Magnetic Particle Examination of Steel Forgings A370 Test Methods and Definitions for Mechanical Testing of Steel Products A388/A388M Practice for Ultrasonic Examination of Steel Forgings A751 Test Methods, Practices, and Terminology for Chemical Analysis of Steel Products A788/A788M Specification for Steel Forgings, General Requirements E139 Test Methods for Conducting Creep, Creep-Rupture, and Stress-Rupture Tests of Metallic Materials Keywords FATT requirement; steel forgings; turbine rotor disks; turbine rotor wheels; vacuum-treated low alloy steel; Generator materials--turbine; Steel forgings (turbine)--specifications; Turbine rotors/shafts; Vacuum treated steel forgings--specifications; ICS Code ICS Number Code 77.140.85 (Iron and steel forgings) DOI: 10.1520/A0471_A0471M-09 ASTM International is a member of CrossRef. ASTM A471 / A471MThe following editions for this book are also available...This book also exists in the following packages...Subscription InformationMADCAD.com ASTM Standards subscriptions are annual and access is unlimited concurrency based (number of people that can access the subscription at any given time) from single office location. For pricing on multiple office location ASTM Standards Subscriptions, please contact us at info@madcad.com or +1 800.798.9296.
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