1、Designation: A788/A788M 10An American National StandardStandard Specification forSteel Forgings, General Requirements1This standard is issued under the fixed designation A788/A788M; the number immediately following the designation indicates the yearof original adoption or, in the case of revision, t
2、he year of last revision. A number in parentheses indicates the year of last reapproval.A superscript epsilon () 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*1.1 This specification2covers
3、 a group of common require-ments that, unless otherwise specified in the individual productspecification, shall apply to steel forgings under any of thefollowing specifications issued by ASTM:ASTMDesignation TitleA266/A266M Carbon Steel Forgings for Pressure VesselComponentsA288 Carbon and Alloy Ste
4、el Forgings for MagneticRetaining Rings for Turbine GeneratorsA289/A289M Alloy Steel Forgings for Nonmagnetic Retain-ing Rings for GeneratorsA290/A290M Carbon and Alloy Steel Forgings for Rings forReduction GearsA291/A291M Steel Forgings, Carbon and Alloy, for Pinions,Gears, and Shafts for Reduction
5、 GearsA336/A336M Alloy Steel Forgings for Pressure and High-Temperature PartsA372/A372M Carbon and Alloy Steel Forgings for Thin-Walled Pressure VesselsA427/A427M Wrought Alloy Steel Rolls for Cold and HotReductionA469/A469M Vacuum-Treated Steel Forgings for GeneratorRotorsA470/A470M Vacuum-Treated
6、Carbon and Alloy SteelForgings for Turbine Rotors and ShaftsA471/A471M Vacuum-Treated Alloy Steel Forgings for Tur-bine Rotor Disks and WheelsA504/A504M Wrought Carbon Steel WheelsA508/A508M Quenched and Tempered Vacuum-TreatedCarbon and Alloy Steel Forgings for Pres-sure VesselsA521/A521M Steel, Cl
7、osed-Impression Die Forgings forGeneral Industrial UseA541/A541M Quenched and Tempered Carbon and AlloySteel Forgings for Pressure Vessel Compo-nentsA579/A579M Superstrength Alloy Steel ForgingsA592/A592M High-Strength Quenched and Tempered Low-Alloy Steel Forged Fittings and Parts forPressure Vesse
8、lsA646/A646M Premium Quality Alloy Steel Blooms and Bil-lets for Aircraft and Aerospace ForgingsA649/A649M Forged Steel Rolls Used for Corrugating Pa-per MachineryA668/A668M Steel Forgings, Carbon and Alloy, for GeneralIndustrial UseA711/A711M Steel Forging StockA723/A723M Alloy Steel Forgings for H
9、igh-Strength Pres-sure Component ApplicationA729/A729M Alloy Steel Axles, Heat Treated, for MassTransit and Electric Railway ServiceA765/A765M Carbon Steel and Low-Alloy Steel Pressure-Vessel-Component Forgings with Manda-tory Toughness RequirementsA768/A768M Vacuum-Treated 12 % Chromium Alloy Steel
10、Forgings for Turbine Rotors and ShaftsA837/A837M Steel Forgings, Alloy, for Carburizing Applica-tionsA859/A859M Age-Hardening Alloy Steel Forgings for Pres-sure Vessel ComponentsA891/A891M Precipitation Hardening Iron Base SuperalloyForgings for Turbine Rotor Disks andWheelsA909/A909M Steel Forgings
11、, Microalloy, for General Indus-trial UseA940/A940M Vacuum Treated Steel Forgings, Alloy, Differ-entially Heat Treated, for Turbine RotorsA965/A965M Steel Forgings, Austenitic, for Pressure andHigh Temperature PartsA982/A982M Steel Forgings, Stainless, for Compressorand Turbine AirfoilsA983/A983M Sp
12、ecification for Continous Grain FlowForged Carbon and Alloy Steel Crankshaftsfor Medium Speed Diesel EnginesA986/A986M Magnetic Particle Examination of ContinuousGrain Flow Crankshaft ForgingsA1021/A1021M Martensitic Stainless Steel Forgings andForging Stock for High-Temperature Ser-viceA1048/A1048M
13、 Pressure Vessel Forgings, Alloy Steel, HigherStrength Chromium-Molybdenum-Tungstenfor Elevated Temperature ServiceA1049/A1049M Stainless Steel Forgings, Ferritic/Austenitic(Duplex), for Pressure Vessels and RelatedComponents1.2 In case of conflict in requirements, the requirements ofthe individual
14、product specifications shall prevail over those ofthis specification.1.3 The purchaser may specify additional requirements (see4.2.3) that do not negate any of the provisions of either thisspecification or of the individual product specifications. Theacceptance of any such additional requirements sh
15、all bedependent on negotiations with the supplier and must beincluded in the order.1.4 If, by agreement, forgings are to be supplied in apartially completed condition, that is, all of the provisions of1This specification is under the jurisdiction of ASTM Committee A01 on Steel,Stainless Steel and Re
16、lated Alloys and is the direct responsibility of SubcommitteeA01.06 on Steel Forgings and Billets.Current edition approved Nov. 15, 2010. Published December 2010. Originallyapproved in 1984. Last previous edition approved in 2008 as A788/A788M 08a.DOI: 10.1520/A0788_A0788M-10.2For ASME Boiler and Pr
17、essure Vessel Code applications, see related Specifi-cation SA788 in Section II of that code.1*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.the product specification
18、have not been filled, then the materialmarking (see Section 17) and certification (see Section 16)shall reflect the extent to which the product specificationrequirements have been met.1.5 As noted in the Certification Section (16), the numberand year date of this specification, as well as that of th
19、e productspecification, are required to be included in the productcertification.1.6 When the SI version of a product specification isrequired by the purchase order, Specification A788/A788Mshall be used in conjunction with Test Methods A1058 insteadof Test Methods and Definitions A370.1.7 The values
20、 stated in either SI units or inch-pound unitsare to be regarded separately as standard. The values stated ineach system may not be exact equivalents; therefore, eachsystem shall be used independently of the other. Combiningvalues from the two systems may result in non-conformancewith the standard.1
21、.8 This standard does not purport to address all of thesafety concerns, if any, associated with its use. It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2. Referenced Do
22、cuments2.1 ASTM Standards:3A266/A266M Specification for Carbon Steel Forgings forPressure Vessel ComponentsA275/A275M Practice for Magnetic Particle Examinationof Steel ForgingsA288 Specification for Carbon and Alloy Steel Forgings forMagnetic Retaining Rings for Turbine GeneratorsA289/A289M Specifi
23、cation for Alloy Steel Forgings forNonmagnetic Retaining Rings for GeneratorsA290/A290M Specification for Carbon and Alloy SteelForgings for Rings for Reduction GearsA291/A291M Specification for Steel Forgings, Carbon andAlloy, for Pinions, Gears and Shafts for Reduction GearsA336/A336M Specificatio
24、n for Alloy Steel Forgings forPressure and High-Temperature PartsA370 Test Methods and Definitions for Mechanical Testingof Steel ProductsA372/A372M Specification for Carbon and Alloy SteelForgings for Thin-Walled Pressure VesselsA388/A388M Practice for Ultrasonic Examination of SteelForgingsA427/A4
25、27M Specification for Wrought Alloy Steel Rollsfor Cold and Hot ReductionA469/A469M Specification for Vacuum-Treated Steel Forg-ings for Generator RotorsA470/A470M Specification for Vacuum-Treated Carbonand Alloy Steel Forgings for Turbine Rotors and ShaftsA471/A471M Specification for Vacuum-Treated
26、 AlloySteel Forgings for Turbine Rotor Disks and WheelsA504/A504M Specification for Wrought Carbon SteelWheelsA508/A508M Specification for Quenched and TemperedVacuum-Treated Carbon and Alloy Steel Forgings forPressure VesselsA521/A521M Specification for Steel, Closed-ImpressionDie Forgings for Gene
27、ral Industrial UseA541/A541M Specification for Quenched and TemperedCarbon and Alloy Steel Forgings for Pressure VesselComponentsA551/A551M Specification for Carbon Steel Tires for Rail-way and Rapid Transit ApplicationsA579/A579M Specification for Superstrength Alloy SteelForgingsA592/A592M Specifi
28、cation for High-Strength Quenchedand Tempered Low-Alloy Steel Forged Parts for PressureVesselsA646/A646M Specification for Premium Quality AlloySteel Blooms and Billets for Aircraft and AerospaceForgingsA649/A649M Specification for Forged Steel Rolls Used forCorrugating Paper MachineryA668/A668M Spe
29、cification for Steel Forgings, Carbon andAlloy, for General Industrial UseA711/A711M Specification for Steel Forging StockA723/A723M Specification for Alloy Steel Forgings forHigh-Strength Pressure Component ApplicationA729/A729M Specification for Alloy Steel Axles, Heat-Treated, for Mass Transit an
30、d Electric Railway ServiceA751 Test Methods, Practices, and Terminology for Chemi-cal Analysis of Steel ProductsA765/A765M Specification for Carbon Steel and Low-Alloy Steel Pressure-Vessel-Component Forgings withMandatory Toughness RequirementsA768/A768M Specification for Vacuum-Treated 12 %Chromiu
31、m Alloy Steel Forgings for Turbine Rotors andShaftsA833 Practice for Indentation Hardness of Metallic Mate-rials by Comparison Hardness TestersA837/A837M Specification for Steel Forgings, Alloy, forCarburizing ApplicationsA859/A859M Specification for Age-Hardening Alloy SteelForgings for Pressure Ve
32、ssel ComponentsA891/A891M Specification for Precipitation HardeningIron Base Superalloy Forgings for Turbine Rotor Disksand WheelsA909/A909M Specification for Steel Forgings, Microalloy,for General Industrial UseA939 Practice for Ultrasonic Examination from Bored Sur-faces of Cylindrical ForgingsA94
33、0/A940M Specification for Vacuum Treated Steel Forg-ings,Alloy, Differentially Heat Treated, for Turbine RotorsA941 Terminology Relating to Steel, Stainless Steel, Re-lated Alloys, and FerroalloysA965/A965M Specification for Steel Forgings, Austenitic,for Pressure and High Temperature PartsA966/A966
34、M Practice for Magnetic Particle Examinationof Steel Forgings Using Alternating Current3For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summar
35、y page onthe ASTM website.A788/A788M 102A982/A982M Specification for Steel Forgings, Stainless,for Compressor and Turbine AirfoilsA983/A983M Specification for Continuous Grain FlowForged Carbon and Alloy Steel Crankshafts for MediumSpeed Diesel EnginesA986/A986M Specification for Magnetic Particle E
36、xamina-tion of Continuous Grain Flow Crankshaft ForgingsA991/A991M Test Method for Conducting TemperatureUniformity Surveys of Furnaces Used to Heat Treat SteelProductsA1021/A1021M Specification for Martensitic StainlessSteel Forgings and Forging Stock for High-TemperatureServiceA1048/A1048M Specifi
37、cation for Pressure Vessel Forgings,Alloy Steel, Higher Strength Chromium-Molybdenum-Tungsten for Elevated Temperature ServiceA1049/A1049M Specification for Stainless Steel Forgings,Ferritic/Austenitic (Duplex), for Pressure Vessels and Re-lated ComponentsA1058 Test Methods for Mechanical Testing of
38、 SteelProductsMetricE23 Test Methods for Notched Bar Impact Testing ofMetallic MaterialsE112 Test Methods for Determining Average Grain SizeE165 Practice for Liquid Penetrant Examination for GeneralIndustryE380 Practice for Use of the International System of Units(SI) (The Modernized Metric System)4
39、E399 Test Method for Linear-Elastic Plane-Strain FractureToughness KIcof Metallic MaterialsE428 Practice for Fabrication and Control of Metal, Otherthan Aluminum, Reference Blocks Used in UltrasonicTestingE1290 Test Method for Crack-Tip Opening Displacement(CTOD) Fracture Toughness MeasurementE1820
40、Test Method for Measurement of Fracture Tough-nessE1916 Guide for Identification and/or Segregation of MixedLots of Metals3. Terminology3.1 Terminology A941 is applicable to this specification.Additional terms and wording more applicable to forgings areas noted in this section.3.2 Forging Definition
41、s:3.2.1 steel forging, nthe product of a substantially com-pressive plastic working operation that consolidates the mate-rial and produces the desired shape. The plastic working maybe performed by a hammer, press, forging machine, or ringrolling machine, and must deform the material to produce aness
42、entially wrought structure.3.2.1.1 DiscussionHot rolling operations may be used toproduce blooms or billets for reforging.3.3 Forging Geometries:3.3.1 bar forging, nforging that has no bore and having anaxial length greater than its maximum cross sectional dimen-sion.3.3.1.1 DiscussionMore than one
43、cross sectional shape orsize may be included. Sometimes referred to as a solid forging.3.3.2 hollow forging, nforging (also known as a shellforging or a mandrel forging) in which (a) the axial length isequal to or greater than the diameter, and (b) the forging lengthand wall thickness are produced b
44、y hot working over a mandrel(usually water cooled) such that the bore diameter remainsessentially the same as that of the mandrel.3.3.2.1 DiscussionUnless a hollow ingot has been used,the starting slug is hot trepanned or punched after upsetting andthe bore diameter adjusted to suit the forging mand
45、rel. Theoutside diameter may be contoured if required. The workpieceis forged between the upper die and lower dies while themandrel is supported by cranes or manipulators to facilitaterotation.3.3.3 ring forging, ntype of hollow forging in which (a)the axial length is less than the diameter, (b) the
46、 wall thicknessis reduced, and (c) the outside diameter is increased by hotworking between the top die and a mandrel supported ontemporary saddles.3.3.3.1 DiscussionForging between the top die and themandrel enables the ring diameter to be increased whilereducing the wall thickness, without increasi
47、ng the axiallength.3.3.4 ring rolling, ninvolves the use of specialized equip-ment whereby a hot punched, trepanned, or bored disk is (a)hot worked between a powered outer roller and an idling innerroller, such that the wall thickness is reduced and the outsidediameter is increased, and (b) the axia
48、l length of the ring is notintended to increase and may be contained by a radiallyoriented tapered roller.3.3.5 disk forging, nforging, sometimes referred to as apancake forging, that has (a) an axial length appreciably lessthan its diameter, (b) may be dished on one or both faces, and(c) final forg
49、ing includes upsetting operations to reduce theheight of the stock and increase its diameter.3.3.5.1 DiscussionSince much of the hot working is donein axially compressing the stock, the central area may notreceive sufficient consolidation. To counter this effect, consid-eration is usually given to the initial saddening (see 3.3.7)ofthe ingot or billet.3.3.6 slab forging, nforging, sometimes referred to as aforged plate, that is usually square or rectangular in shape, witha thickness appreciably smaller than the other dimension. Thehot working may include upsetting.3.3.
