ASTM A472/A472M-05
(Test Method)Standard Test Method for Heat Stability of Steam Turbine Shafts and Rotor Forgings
Standard Test Method for Heat Stability of Steam Turbine Shafts and Rotor Forgings
SCOPE
1.1 This test method covers the determination of heat stability of steam turbine shafts and rotor forgings to ensure stability at operating temperature. This test method is not ordinarily applicable to generator rotor forgings.
1.2 This test method is expressed in both inch-pound unit and in SI units; however, unless the purchase order or contract specifies the applicable M specification designation (SI units), the inch-pound units shall apply. The values stated in either inch-pound units or SI units are to be regarded separately as standard. Within the test method, the SI units as shown in brackets. 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 nonconformance with the standard.
1.3 Supplementary requirements of an optional nature are provided for use at the option of the purchaser. The supplementary requirements shall apply only when specified individually by the purchaser in the purchase order or contract.
1.4 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
Relations
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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 472/A472M–05
Standard Test Method for
1
Heat Stability of Steam Turbine Shafts and Rotor Forgings
This standard is issued under the fixed designationA472/A 472M; 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.
1. Scope* centered and machined with allowance to finish to the purchas-
er’s drawing. Material for mechanical tests may be removed
1.1 This test method covers the determination of heat
before or after the stability test at the manufacturer’s option,
stability of steam turbine shafts and rotor forgings to ensure
unless check tests after the stability test are required by the
stability at operating temperature. This test method is not
purchaser.
ordinarily applicable to generator rotor forgings.
3.2 With prior approval from the purchaser, the forgings
1.2 This test method is expressed in both inch-pound unit
may be stress-relieved as part of the heat stability test. When
and in SI units; however, unless the purchase order or contract
this is done, the stress-relieving temperature shall be within 50
specifies the applicable M specification designation (SI units),
to 100°F [30 to 55°C] below final tempering temperature.
the inch-pound units shall apply. The values stated in either
Rotate the forgings at 2 to 4 r/min and hold at stress-relieving
inch-pound units or SI units are to be regarded separately as
temperature for at least 2 h/in. [2 h/25 mm] of maximum radial
standard. Within the test method, the SI units as shown in
thickness, after which the temperature may be decreased to the
brackets. The values stated in each system may not be exact
specified heat stability test temperature and the test performed.
equivalents;therefore,eachsystemshallbeusedindependently
of the other. Combining values from the two systems may
4. Heat Stability Test Bands
result in nonconformance with the standard.
4.1 The supplier shall mark positionsA, B, C, and D, spaced
1.3 Supplementary requirements of an optional nature are
90°apartcircumferentially,preferablyonanendoftheforging.
provided for use at the option of the purchaser. The supple-
Markings shall be retained throughout all subsequent opera-
mentary requirements shall apply only when specified indi-
tions.
vidually by the purchaser in the purchase order or contract.
4.2 Preferably, there shall be a minimum of 5 test bands,
1.4 This standard does not purport to address all of the
denoted as 1, 2, 3, 4, and 5, machined on the circumference of
safety concerns, if any, associated with its use. It is the
the forging. Numbering shall start at the left side of the forging
responsibility of the user of this standard to establish appro-
drawing. Bands 1 and 5 shall be located as close to the end of
priate safety and health practices and determine the applica-
the forging as practical. Band 3 shall be located as near to
bility of regulatory limitations prior to use.
midlength as practical. Bands 2 and 4 shall be located
2. Ordering Information approximately equidistant between 1 and 3, and 3 and 5,
respectively.
2.1 It shall be the responsibility of the purchaser to specify
4.3 When the shipped length of the barrel portion of the
all requirements necessary for testing under this specification.
forging is less than 8 ft [2.4 m], bands 2 and 4 may be omitted.
Requirements to be considered include, but are not limited to,
4.4 The purchaser’s drawing may show the desired number
the following:
and location of bands and shall indicate that portion of the
2.1.1 ASTM designation and year date,
forging that shall be located within the heating chamber. Bands
2.1.2 The minimum test temperature,
1 and 5 are to be located outside of the heating chamber.
2.1.3 The portion of the forging to be subjected to the heat
Preferably, the gland areas/packing seal areas are inside the
stability test temperature, and
heating chamber.
2.1.4 Supplementary or other special requirements.
4.5 The test bands shall be machined with the forging
3. Procedure
running on centers except in the cases of forgings weighing
over 125 000 lb [56.7 metric tons] the machining shall be
3.1 The heat stability test shall be conducted by the forging
performed with the forgings running on steady rests. Readings
supplier after final heat treatment and after the forging has been
shall be taken with the forging running on centers except in the
cases of forgings weighing over 125 000 lb [56.7 metric tons]
1
This test method is under the jurisdiction of ASTM Committee A01 on Steel,
where readings may be taken with the forgings running on
Stainless Steel, and RelatedAlloys and is the direct responsibility of Subco
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.