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ASTM A291-95(1999)

(Specification)

Standard Specification for Steel Forgings, Carbon and Alloy, for Pinions, Gears and Shafts for Reduction Gears

Standard Specification for Steel Forgings, Carbon and Alloy, for Pinions, Gears and Shafts for Reduction Gears

SCOPE
1.1 This specification covers normalized and tempered carbon steel and quenched and tempered alloy steel forgings for pinions, gears, and shafts.  
1.2 Several classes of steel are covered as follows:  
1.2.1 Class 1 is normalized and tempered carbon steel.  
1.2.2 Classes 2 to 9 , incl, are liquid quenched and tempered alloy steel.  
1.3 All classes are considered weldable under proper conditions. Welding technique is of fundamental importance and it is presupposed that welding procedure and inspection shall be in accordance with approved methods for the class of material used.  
1.4 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-Sep-1999
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
Current Stage
Ref Project

Relations

Replaced By
ASTM A291-02 - Standard Specification for Steel Forgings, Carbon and Alloy, for Pinions, Gears and Shafts for Reduction Gears
Effective Date
10-Jun-2002

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ASTM A291-95(1999) - Standard Specification for Steel Forgings, Carbon and Alloy, for Pinions, Gears and Shafts for Reduction GearsASTM A291-95(1999) - Standard Specification for Steel Forgings, Carbon and Alloy, for Pinions, Gears and Shafts for Reduction Gears
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ASTM A291-95(1999) - Standard Specification for Steel Forgings, Carbon and Alloy, for Pinions, Gears and Shafts for Reduction Gears
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NOTICE: This standard has either been superseded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
Designation: A 291 – 95 (Reapproved 1999) An American National Standard
Standard Specification for
Steel Forgings, Carbon and Alloy, for Pinions, Gears and
Shafts for Reduction Gears
This standard is issued under the fixed designation A 291; 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 4. Heat Treatment
1.1 This specification covers normalized and tempered car- 4.1 Preliminary Heat Treatment:
bon steel and quenched and tempered alloy steel forgings for 4.1.1 The forgings shall be given such preliminary heat
pinions, gears, and shafts. treatment as is proper for the design and composition. The
1.2 Several classes of steel are covered as follows: forgings shall be heated to a suitable temperature for a
1.2.1 Class 1 is normalized and tempered carbon steel. sufficient length of time for austenitization and shall be suitably
1.2.2 Classes 2 to 9, incl, are liquid quenched and tempered cooled to bring about complete transformation.
alloy steel. 4.1.2 Forgings may be immediately treated for mechanical
1.3 All classes are considered weldable under proper con- properties after preliminary heat treatment or may be rough
ditions. Welding technique is of fundamental importance and it turned prior to treatment for mechanical properties.
is presupposed that welding procedure and inspection shall be 4.2 Heat Treatment for Mechanical Properties—The forg-
in accordance with approved methods for the class of material ing shall be reheated to a temperature above the upper critical
used. temperature and held a sufficient length of time for complete
1.4 The values stated in inch-pound units are to be regarded austenitization. Class 1 shall be air cooled while Classes 2
as the standard. The values given in parentheses are for through 8 shall be liquid quenched.
information only. 4.3 Tempering—The forgings shall be tempered to develop
the specified properties. Minimum tempering temperatures
2. Referenced Documents
shall be as follows:
2.1 ASTM Standards:
Minimum Tempering Temperature
Class °F (°C)
A 275/A 275M Test Method for Magnetic Particle Exami-
2 1 and 2 1150 (620)
nation of Steel Forgings
3, 3A, and 4 1075 (580)
A 370 Test Methods and Definitions for Mechanical Testing
5, 6, 7 1050 (565)
8 1100 (595)
of Steel Products
9 1000 (540)
A 388/A 388M Practice for Ultrasonic Examination of
Heavy Steel Forgings The charge shall be cooled under uniform conditions in the
furnace at a maximum rate of 100°F (55°C) per h to 600°F
A 788 Specification for Steel Forgings, General Require-
ments (316°C).
4.4 Stress Relief—If the manufacturer elects to heat treat for
3. Ordering Information
mechanical properties prior to machining, the forgings shall be
3.1 Instructions for purchasing forgings to this specification stress relieved after machining (4.5) at a temperature that is 50
should be in accordance with Specification A 788. In addition,
to 100°F (28 to 55°C) below the last previous tempering
a detailed drawing, sketch, or written description of the forging temperature but in no case below 1000°F (540°C). The
should be included with the inquiry or order.
forgings shall be cooled under uniform conditions in the
3.2 Supplementary requirements are provided and shall furnace at a maximum rate of 100°F (55°C)/h to 600°F
apply only when specified in the purchase order.
(316°C).
4.5 Machining:
4.5.1 Rough machining before heat treatment for mechani-
This specification is under the jurisdiction of ASTM Committee A-1 on Steel,
cal properties may be performed at the option of the manufac-
Stainless Steel and Related Alloys, and is the direct responsibility of Subcommittee
A01.06 on Steel Forgings and Billets.
turer.
Current edition approved July 15, 1995. Published September 1995. Originally
4.5.2 If the producer elects to heat treat for mechanical
published as A291 – 46. Last previous edition A291 – 92.
2 properties prior to machining, the forgings shall be stress
Annual Book of ASTM Standards, Vol 01.05.
Annual Book of ASTM Standards, Vol 01.03.
Copyright © ASTM, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959, United States.
A 291
relieved after machining. full-size prolongation left on one end of each individual
4.5.3 Boring—Forgings, after being heat treated for me- forging or on both ends of the multiple forging if the forgings
chanical properties and subsequently bored, shall be stress are made in multiple. The nominal or specified outside rough-
relieved. machined diameter or thickness of the forgings, disregarding
large ends, collars and flanges, shall determine the size of
5. General Requirements
prolongations for test specimens.
5.1 Unless otherwise specified herein, the requirements of 7.1.3.3 The axis of the longitudinal tension test specimen
Specification A 788 shall apply to forgings supplied to this shall be located at any point 1 ⁄4 in. (31.75 mm) below the
specification. surface of the forging. The axis of the tangential test specimen
shall be located as near to the surface of the forging as
6. Chemical Requirements
practicable.
6.1 The steel shall conform to the requirements for chemical 7.2 Brinell Hardness:
composition prescribed in Table 1. 7.2.1 The material shall conform to the requirements for
6.2 The limits for elements other than carbon, manganese, hardness as prescribed in Table 3. Brinell hardness tests shall
phosphorus, sulfur, and silicon in Class 2 alloy shall be agreed be made on prepared areas on the forgings after machining to
upon between the manufacturer and purchaser. the sizes ordered by the purchaser and after stress relieving if
stress relieving is required.
7. Mechanical Requirements
7.2.2 Number and Location of Tests—On each forging 8 in.
7.1 Tensile and Impact Requirements: (203 mm) and over in diameter, four Brinell hardness tests
shall be made on the outside surface of that portion of the
7.1.1 The material shall conform to the requirements for
tensile and impact properties prescribed in Table 2 when tested forging on which teeth will be cut, two tests being made on
each helix 180° apart and the tests on the two helices shall be
in accordance with Test Methods and Definitions A 370 and
impact properties (see S2) when agreed upon between the 90° apart. On each forging under 8 in. in diameter, two Brinell
purchaser and the supplier. hardness tests shall be made, one on each helix 180° apart.
7.1.2 Classification—The nominal or specified rough- Hardness tests shall be performed at the quarter-face width of
machined diameter or thickness of solid forgings, disregarding the tooth portion diameter. On shaft forgings, two hardness
large ends, collars and flanges, or the nominal rough-machined tests shall be made on each end 180° apart.
wall thickness of bored forgings shall determine the size 7.2.3 Test Method—Tests shall be made in accordance with
classification. Test Methods and Definitions A 370.
7.1.3 Number, Location, and Orientation of Test Specimens:
8. Retreatment
7.1.3.1 At least one tension test specimen either longitudinal
8.1 If the results of the mechanical tests of any forging do
or tangential at the option of the manufacturer shall be taken
not conform to the specified requirements, the manufacturer
from each forging unless a number of forgings are forged and
may retreat the forging one or more times, but not more than
treated in multiple, in which case one tension test specimen
three additional times without approval of the purchaser.
shall be taken from each end of the multiple forging. When
impact tests are specified in accordance with Supplementary
9. Dimensions and Tolerance
Requirement S2, one set of impact tests shall also b
...

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1.1 This practice for ultrasonic examination covers turbine and generator steel rotor forgings covered by Specifications A469/A469M, A470/A470M, A768/A768M, and A940/A940M. This practice shall be used for contact testing only.  
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1.3 This practice is intended to provide a means of inspecting cylindrical forgings so that the inspection sensitivity at the forging center line or bore surface is constant, independent of the forging or bore diameter. To this end, inspection sensitivity multiplication factors have been computed from theoretical analysis, with experimental verification. These are plotted in Fig. 1 (bored rotors) and Fig. 2 (solid rotors), for a true inspection frequency of 2.25 MHz, and an acoustic velocity of 2.30 in./s × 105 in./s [5.85 cm/s × 105 cm/s]. Means of converting to other sensitivity levels are provided in Fig. 3. (Sensitivity multiplication factors for other frequencies may be derived in accordance with X1.1 and X1.2 of Appendix X1.)  
FIG. 1 Bored Forgings
Note 1: Sensitivity multiplication factor such that a 10 % indication at the forging bore surface will be equivalent to a 1/8 in. [3 mm] diameter flat bottom hole. Inspection frequency: 2.0 MHz or 2.25 MHz. Material velocity: 2.30 in./s × 105 in./s [5.85 cm/s × 105 cm/s].
FIG. 2 Solid Forgings
Note 1: Sensitivity multiplication factor such that a 10 % indication at the forging centerline surface will be equivalent to a 1/8 in. [3 mm] diameter flat bottom hole. Inspection frequency: 2.0 MHz or 2.25 MHz. Material velocity: 2.30 in./s × 105 in./s [5.85 cm/s × 105 cm/s].
FIG. 3 Conversion Factors to Be Used in Conjunction with Fig. 1 and Fig. 2 if a Change in the Reference Reflector Diameter is Required
1.4 Considerable verification data for this method have been generated which indicate that even under controlled conditions very significant uncertainties may exist in estimating natural discontinuities in terms of minimum equivalent size flat-bottom holes. The possibility exists that the estimated minimum areas of natural discontinuities in terms of minimum areas of the comparison flat-bottom holes may differ by 20 dB (factor of 10) in terms of actual areas of natural discontinuities. This magnitude of inaccuracy does not apply to all results but should be recognized as a possibility. Rigid control of the actual frequency used, the coil bandpass width if tuned instruments are used, and so forth, tend to reduce the overall inaccuracy which is apt to develop.  
1.5 This practice for inspection applies to solid cylindrical forgings having outer diameters of not less than 2.5 in. [64 mm] nor greater than 100 in. [2540 mm]. It also applies to cylindrical forgings with concentric cylindrical bores having wall thicknesses of 2.5 [64 mm] in. or greater, within the same outer diameter limits as for solid cylinders. For solid sections less than 15 in. [380 mm] in diameter and for bored cylinders of less than 7.5 in. [190 mm] wall thickness the transducer used for the inspection will be different than the transducer used for larger sections.  
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This test method deals with the acceptance criteria for the magnetic particle examination of forged steel crankshafts and forgings having large main bearing journal or crankpin diameters. Covered here are three classes of forgings, which shall be evaluated under two areas of inspection, namely: major critical areas, and minor critical areas. During inspection, magnetic particle indications shall be classified as: surface indications, which include nonmetallic inclusions or stringers, open or twist cracks, flakes, or pipes; open or pinpoint indications; and non-open indications. Procedures for dimpling, depressing, inspection, and product marking are also mentioned.
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1.2.3 Class 3 (formerly covered in Supplementary Requirement S1 of Specification A456 – 64 (1970)).  
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1.4 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.  
1.5 Unless the order specifies the applicable “M” specification designation, the material shall be furnished to the inch units.  
1.6 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

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This specification covers standards for forged carbon steel piping components, that is, flanges, fittings, valves, and similar parts, for use in pressure systems at ambient and higher-temperature service conditions. Materials shall be subjected to heat treatment (annealing, normalizing, tempering, or quenching). Material shall conform to carbon, manganese, phosphorus, sulfur, silicon, copper, nickel, chromium, molybdenum and vanadium contents. The forgings shall be subjected to tension, hardness and hydrostatic tests, with the latter applicable when required. Material shall adhere to tensile strength, yield strength, elongation, reduction of area, and hardness requirements. Guidelines for retreatment, repair by welding, and product marking are given.
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1.1 This specification2 covers forged carbon steel piping components for ambient- and higher-temperature service in pressure systems. Included are flanges, fittings, valves, and similar parts ordered either to dimensions specified by the purchaser or to dimensional standards such as the MSS, ASME, and API specifications referenced in Section 2. Forgings made to this specification are limited to a maximum weight of 10 000 lb [4540 kg]. Larger forgings may be ordered to Specification A266/A266M. Tubesheets and hollow cylindrical forgings for pressure vessel shells are not included within the scope of this specification. Although this specification covers some piping components machined from rolled bar and seamless tubular products (see 5.2), it does not cover raw material produced in these product forms.  
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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.
SCOPE
1.1 This specification covers vacuum-treated alloy steel forgings intended for use as turbine rotor disks and wheels.  
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ASTM A275/A275M-23(Practice)
Standard Practice for Magnetic Particle Examination of Steel Forgings

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This test method covers the procedures for the standard practice of performing magnetic particle examination on steel forgings. The inspection medium shall consist of finely divided ferromagnetic particles, whose size, shape and magnetic properties, both individually and collectively, shall be taken into account. Forgings may be magnetized in the longitudinal or circular direction by employing the surge or continuous current flow methods. Magnetization may be applied by passing current through the piece or by inducing a magnetic field by means of a central conductor, such as a prod or yoke, or by coils. While the material is properly magnetized, the magnetic particles may be applied by either the dry method, wet method, or fluorescent method. The parts shall also be sufficiently demagnetized after inspection so that residual or leakage fields will not interfere with future operations to which the steel forgings shall be used for. Indications to be evaluated are grouped into three broad classes, namely: surface defects, which include laminar defects, forging laps and folds, flakes (thermal ruptures caused by entrapped hydrogen), heat-treating cracks, shrinkage cracks, grinding cracks, and etching or plating cracks; subsurface defects, which include stringers of nonmetallic inclusions, large nonmetallics, cracks in underbeads of welds, and forging bursts; and nonrelevant or false indications, which include magnetic writing, changes in section, edge of weld, and flow lines.
SIGNIFICANCE AND USE
4.1 For ferromagnetic materials, magnetic particle examination is widely specified for the detection of surface and near surface discontinuities such as cracks, laps, seams, and linearly oriented nonmetallic inclusions. Such examinations are included as mandatory requirements in some forging standards such as Specification A508/A508M.  
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1.2 Only direct current or rectified alternating (full or half wave) current shall be used as the electric power source for any of the magnetizing methods. Alternating current is not permitted because its capability to detect subsurface discontinuities is very limited and therefore unsuitable.  
1.2.1 Portable battery powered electromagnetic yokes are outside the scope of this practice.
Note 1: Guide E709 may be utilized for magnetic particle examination in the field for machinery components originally manufactured from steel forgings.  
1.3 The minimum requirements for magnetic particle examination shall conform to practice standards of Practice E1444/E1444M. If the requirements of this practice are in conflict with the requirements of Practice E1444/E1444M, the requirements of this practice shall prevail.  
1.4 This practice and the applicable material specifications are expressed in both inch-pound units and SI units. However, unless the order specifies the applicable “M” specification designation [SI units], the material shall be furnished to inch-pound units.  
1.5 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system are not necessarily exact equivalents; therefore, to ensure conformance with the standard, each system shall be used independently of the other, and values from the two systems shall not be combined.  
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ASTM A388/A388M-23(Practice)
Standard Practice for Ultrasonic Examination of Steel Forgings

ABSTRACT
This practice covers the examination procedures for the contact, pulse-echo ultrasonic examination of heavy steel forgings by the straight and angle-beam techniques. An ultrasonic, pulsed, reflection type of instrument shall be used and shall provide linear presentation for at least 75% of the screen height. The 5% linearity referred to is descriptive of the screen presentation of amplitude. The electronic apparatus shall contain an attenuator, search units, transducers, couplants, reference blocks, and DGS scales. The forging shall be machined to provide cylindrical surfaces for radial examination in the case of round forgings. The ends of the forgings shall be machined perpendicular to the axis of the forging for the axial examination. Faces of disk and rectangular forgings shall be machined flat and parallel to one another. The procedures to be performed are as follows: ultrasonic examination of the forgings; straight-beam examination with establishment of the instrument sensitivity and calibration either by the reflection, reference-block technique, or DGS method; and angle-beam examination used for rings and hollow forgings.
SIGNIFICANCE AND USE
4.1 This practice shall be used when ultrasonic inspection is required by the order or specification for inspection purposes where the acceptance of the forging is based on limitations of the number, amplitude, or location of discontinuities, or a combination thereof, which give rise to ultrasonic indications.  
4.2 The ultrasonic quality level shall be clearly stated as order requirements.
SCOPE
1.1 This practice2 covers the examination procedures for the contact, pulse-echo ultrasonic examination of steel forgings by the straight and angle-beam techniques. The straight beam techniques include utilization of the DGS (Distance Gain-Size) method. See Appendix X3.  
1.2 This practice is to be used whenever the inquiry, contract, order, or specification states that forgings are to be subject to ultrasonic examination in accordance with Practice A388/A388M.  
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 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.  
1.5 This practice and the applicable material specifications are expressed in both inch-pound units and SI units. However, unless the order specifies the applicable “M” specification designation [SI units], the material shall be furnished to inch-pound units.  
1.6 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
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ASTM A336/A336M-23(Specification)
Standard Specification for Alloy Steel Forgings for Pressure and High-Temperature Parts

ABSTRACT
This specification deals with ferritic alloy steel forgings for high-pressure and high-temperature parts, such as boilers, pressure vessels, and associated equipment. The steel grades covered here include the following: Grade F1; Grade F11, Classes 1, 2, and 3; Grade F12; Grade F5; Grade F5A; Grade F9; Grade F6; Grades F21 and F22, Classes 1 and 3; Grade F91, Grade F3V; and Grade F22V. Other steel grades may also be treated under this specification. Alloy steels shall be melted, forged, and rough machined at stipulated conditions. Except as permitted for Grade F22V, steel forgings shall be annealed or normalized and tempered, but may alternatively be liquid quenched and tempered as well. Impact and Charpy V-notch tests shall be performed wherein specimens shall conform to specified mechanical requirements such as notch toughness, tensile strength, yield strength, elongation, and reduction of area. Materials shall also undergo heat and product analyses and conform to specified chemical requirements.
SCOPE
1.1 This specification2 covers ferritic steel forgings for boilers, pressure vessels, high-temperature parts, and associated equipment.  
1.2 Forgings made of steel grades listed in Specification A335/A335M may also be ordered under this specification. The chemical, tensile, heat treatment, and marking requirements of Specification A335/A335M shall apply, except the forging shall conform to the chemical requirements of Tables 1 and 2 of Specification A335/A335M only with respect to heat analysis. On product analysis they may deviate from these limits to the extent permitted in Table 1 of this specification.  
1.3 Supplementary Requirements S1 to S10 are provided for use when additional testing or inspection is desired. These shall apply only when specified individually by the purchaser in the order.  
1.4 Unless the order specifies the applicable “M” specification designation, the material shall be furnished to the inch-pound units.  
1.5 Specification A336/A336M formerly included austenitic steel forgings, which are now found in Specification A965/A965M.  
1.6 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system are not necessarily exact equivalents; therefore, to ensure conformance with the standard, each system shall be used independently of the other, and values from the two systems shall not be combined.  
1.7 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

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ASTM
ASTM A472/A472M-23(Specification)
Standard Specification for Heat Stability of Steam Turbine Shafts and Rotor Forgings

ABSTRACT
This measurement method covers the procedures for the standard practice of determining the heat stability of steam turbine and rotor forgings to ensure stability at operating temperature. Surface and test band preparation, and heating and cooling procedures prior to stability measurements are detailed. Interpretation of the results of cold and hot measurements is also described.
SCOPE
1.1 This specification covers the determination of heat stability of steam turbine shafts and rotor forgings to ensure stability at operating temperature. This specification is not ordinarily applicable to generator rotor forgings.  
1.2 This specification is expressed in both inch-pound units 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 specification, the SI units are shown in brackets. The values stated in each system are not necessarily exact equivalents; therefore, to ensure conformance with the standard, each system shall be used independently of the other, and values from the two systems shall not be combined.  
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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

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ASTM
ASTM A473-23a(Specification)
Standard Specification for Stainless Steel Forgings

ABSTRACT
This specification covers austenitic, austenitic-ferritic, ferritic, and martensitic stainless steel forgings for general use, and for low- or high-temperature service. The different solution heat treatment and annealing treatment received by the steel material are presented in details. The steel shall conform to the specified chemical composition and room temperature mechanical requirements. The forgings shall be produced with prolongations for testing, unless otherwise specified. The number of and procedure for tension test for forgings depending on their weight are presented. The tension test specimens shall be taken from the test prolongations or from the forgings.
SCOPE
1.1 This specification covers austenitic, austenitic-ferritic, ferritic, and martensitic stainless steel forgings for general use, and for low- or high-temperature service.  
1.2 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.  
1.3 Supplementary requirements from Specification A788/A788M may be specified when additional testing, inspection, or processing is required.  
1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

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