ASTM A788 / A788M - 14a

    Standard Specification for Steel Forgings, General Requirements

    Active Standard ASTM A788 / A788M | Developed by Subcommittee: A01.06

    Book of Standards Volume: 01.05


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    Abstract

    This specification covers a group of common requirements that, unless covered by the individual product specification in another ASTM document, applies to steel forgings for general use. Materials shall be produced primarily by either electric-furnace, basic oxygen, vacuum-induction (VIM), or open-hearth melting process. The primary melting may incorporate separate degassing or refining and may be followed by secondary melting, using electro slag (ESR) or vacuum arc remelting (VAR). Steel shall be forged by any of these three classes based on forging temperature: cold-worked forging, hot-cold-worked forging, or hot-worked forging. After forging, specimens shall be allowed to cool prior to reheating for heat treatment. Details of heat and product analyses for the evaluation of chemical composition are thoroughly discussed. Tension and hardness tests shall be conducted to evaluate mechanical properties such as percentage of elongation and reduction of area. Repair welding shall not be allowed unless permitted by the product specification.

    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 specification2 covers a group of common requirements that, unless otherwise specified in the individual product specification, shall apply to steel forgings under any of the following specifications issued by ASTM:

    ASTM
    Designation

    Title

    A266/A266M

    Carbon Steel Forgings for Pressure Vessel Components

    A288

    Carbon and Alloy Steel Forgings for Magnetic Retaining Rings for Turbine Generators

    A289/A289M

    Alloy Steel Forgings for Nonmagnetic Retaining Rings for Generators

    A290/A290M

    Carbon and Alloy Steel Forgings for Rings for Reduction Gears

    A291/A291M

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

    A336/A336M

    Alloy Steel Forgings for Pressure and High-Temperature Parts

    A372/A372M

    Carbon and Alloy Steel Forgings for Thin-Walled Pressure Vessels

    A427/A427M

    Wrought Alloy Steel Rolls for Cold and Hot Reduction

    A469/A469M

    Vacuum-Treated Steel Forgings for Generator Rotors

    A470/A470M

    Vacuum-Treated Carbon and Alloy Steel Forgings for Turbine Rotors and Shafts

    A471/A471M

    Vacuum-Treated Alloy Steel Forgings for Turbine Rotor Disks and Wheels

    A504/A504M

    Wrought Carbon Steel Wheels

    A508/A508M

    Quenched and Tempered Vacuum-Treated Carbon and Alloy Steel Forgings for Pressure Vessels

    A521/A521M

    Steel, Closed-Impression Die Forgings for General Industrial Use

    A541/A541M

    Quenched and Tempered Carbon and Alloy Steel Forgings for Pressure Vessel Components

    A579/A579M

    Superstrength Alloy Steel Forgings

    A592/A592M

    High-Strength Quenched and Tempered Low-Alloy Steel Forged Fittings and Parts for Pressure Vessels

    A646/A646M

    Premium Quality Alloy Steel Blooms and Billets for Aircraft and Aerospace Forgings

    A649/A649M

    Forged Steel Rolls Used for Corrugating Paper Machinery

    A668/A668M

    Steel Forgings, Carbon and Alloy, for General Industrial Use

    A711/A711M

    Steel Forging Stock

    A723/A723M

    Alloy Steel Forgings for High-Strength Pressure Component Application

    A729/A729M

    Alloy Steel Axles, Heat Treated, for Mass Transit and Electric Railway Service

    A765/A765M

    Carbon Steel and Low-Alloy Steel Pressure-Vessel-Component Forgings with Mandatory Toughness Requirements

    A768/A768M

    Vacuum-Treated 12 % Chromium Alloy Steel Forgings for Turbine Rotors and Shafts

    A837/A837M

    Steel Forgings, Alloy, for Carburizing Applications

    A859/A859M

    Age-Hardening Alloy Steel Forgings for Pressure Vessel Components

    A891/A891M

    Precipitation Hardening Iron Base Superalloy Forgings for Turbine Rotor Disks and Wheels

    A909/A909M

    Steel Forgings, Microalloy, for General Industrial Use

    A940/A940M

    Vacuum Treated Steel Forgings, Alloy, Differentially Heat Treated, for Turbine Rotors

    A965/A965M

    Steel Forgings, Austenitic, for Pressure and High Temperature Parts

    A982/A982M

    Steel Forgings, Stainless, for Compressor and Turbine Airfoils

    A983/A983M

    Specification for Continous Grain Flow Forged Carbon and Alloy Steel Crankshafts for Medium Speed Diesel Engines

    A986/A986M

    Magnetic Particle Examination of Continuous Grain Flow Crankshaft Forgings

    A1021/A1021M

    Martensitic Stainless Steel Forgings and Forging Stock for High-Temperature Service

    A1048/A1048M

    Pressure Vessel Forgings, Alloy Steel, Higher Strength Chromium-Molybdenum-Tungsten for Elevated Temperature Service

    A1049/A1049M

    Stainless Steel Forgings, Ferritic/Austenitic (Duplex), for Pressure Vessels and Related Components

    1.2 In case of conflict in requirements, the requirements of the individual product specifications shall prevail over those of this specification.

    1.3 The purchaser may specify additional requirements (see 4.2.3) that do not negate any of the provisions of either this specification or of the individual product specifications. The acceptance of any such additional requirements shall be dependent on negotiations with the supplier and must be included in the order.

    1.4 If, by agreement, forgings are to be supplied in a partially completed condition, that is, all of the provisions of the product specification have not been filled, then the material marking (see Section 17) and certification (see Section 16) shall reflect the extent to which the product specification requirements have been met.

    1.5 As noted in the Certification Section (16), the number and year date of this specification, as well as that of the product specification, are required to be included in the product certification.

    1.6 When the SI version of a product specification is required by the purchase order, Specification A788/A788M shall be used in conjunction with Test Methods A1058 instead of Test Methods and Definitions A370.

    1.7 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.

    1.8 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.


    2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

    ASTM Standards

    A266/A266M Specification for Carbon Steel Forgings for Pressure Vessel Components

    A275/A275M Practice for Magnetic Particle Examination of Steel Forgings

    A288 Specification for Carbon and Alloy Steel Forgings for Magnetic Retaining Rings for Turbine Generators

    A289/A289M Specification for Alloy Steel Forgings for Nonmagnetic Retaining Rings for Generators

    A290/A290M Specification for Carbon and Alloy Steel Forgings for Rings for Reduction Gears

    A291/A291M Specification for Steel Forgings, Carbon and Alloy, for Pinions, Gears and Shafts for Reduction Gears

    A336/A336M Specification for Alloy Steel Forgings for Pressure and High-Temperature Parts

    A370 Test Methods and Definitions for Mechanical Testing of Steel Products

    A372/A372M Specification for Carbon and Alloy Steel Forgings for Thin-Walled Pressure Vessels

    A388/A388M Practice for Ultrasonic Examination of Steel Forgings

    A427/A427M Specification for Wrought Alloy Steel Rolls for Cold and Hot Reduction

    A469/A469M Specification for Vacuum-Treated Steel Forgings for Generator Rotors

    A470/A470M Specification for Vacuum-Treated Carbon and Alloy Steel Forgings for Turbine Rotors and Shafts

    A471/A471M Specification for Vacuum-Treated Alloy Steel Forgings for Turbine Rotor Disks and Wheels

    A504/A504M Specification for Wrought Carbon Steel Wheels

    A508/A508M Specification for Quenched and Tempered Vacuum-Treated Carbon and Alloy Steel Forgings for Pressure Vessels

    A521/A521M Specification for Steel, Closed-Impression Die Forgings for General Industrial Use

    A541/A541M Specification for Quenched and Tempered Carbon and Alloy Steel Forgings for Pressure Vessel Components

    A551/A551M Specification for Carbon Steel Tires for Railway and Rapid Transit Applications

    A579/A579M Specification for Superstrength Alloy Steel Forgings

    A592/A592M Specification for High-Strength Quenched and Tempered Low-Alloy Steel Forged Parts for Pressure Vessels

    A646/A646M Specification for Premium Quality Alloy Steel Blooms and Billets for Aircraft and Aerospace Forgings

    A649/A649M Specification for Forged Steel Rolls Used for Corrugating Paper Machinery

    A668/A668M Specification for Steel Forgings, Carbon and Alloy, for General Industrial Use

    A711/A711M Specification for Steel Forging Stock

    A723/A723M Specification for Alloy Steel Forgings for High-Strength Pressure Component Application

    A729/A729M Specification for Alloy Steel Axles, Heat-Treated, for Mass Transit and Electric Railway Service

    A751 Test Methods, Practices, and Terminology for Chemical Analysis of Steel Products

    A765/A765M Specification for Carbon Steel and Low-Alloy Steel Pressure-Vessel-Component Forgings with Mandatory Toughness Requirements

    A768/A768M Specification for Vacuum-Treated 12 % Chromium Alloy Steel Forgings for Turbine Rotors and Shafts

    A833 Practice for Indentation Hardness of Metallic Materials by Comparison Hardness Testers

    A837/A837M Specification for Steel Forgings, Alloy, for Carburizing Applications

    A859/A859M Specification for Age-Hardening Alloy Steel Forgings for Pressure Vessel Components

    A891/A891M Specification for Precipitation Hardening Iron Base Superalloy Forgings for Turbine Rotor Disks and Wheels

    A909/A909M Specification for Steel Forgings, Microalloy, for General Industrial Use

    A939/A939M Practice for Ultrasonic Examination from Bored Surfaces of Cylindrical Forgings

    A940/A940M Specification for Vacuum Treated Steel Forgings, Alloy, Differentially Heat Treated, for Turbine Rotors

    A941 Terminology Relating to Steel, Stainless Steel, Related Alloys, and Ferroalloys

    A965/A965M Specification for Steel Forgings, Austenitic, for Pressure and High Temperature Parts

    A966/A966M Practice for Magnetic Particle Examination of Steel Forgings Using Alternating Current

    A982/A982M Specification for Steel Forgings, Stainless, for Compressor and Turbine Airfoils

    A983/A983M Specification for Continuous Grain Flow Forged Carbon and Alloy Steel Crankshafts for Medium Speed Diesel Engines

    A986/A986M Specification for Magnetic Particle Examination of Continuous Grain Flow Crankshaft Forgings

    A991/A991M Test Method for Conducting Temperature Uniformity Surveys of Furnaces Used to Heat Treat Steel Products

    A1021/A1021M Specification for Martensitic Stainless Steel Forgings and Forging Stock for High-Temperature Service

    A1048/A1048M Specification for Pressure Vessel Forgings, Alloy Steel, Higher Strength Chromium-Molybdenum-Tungsten for Elevated Temperature Service

    A1049/A1049M Specification for Stainless Steel Forgings, Ferritic/Austenitic (Duplex), for Pressure Vessels and Related Components

    A1058 Test Methods for Mechanical Testing of Steel Products--Metric

    E23 Test Methods for Notched Bar Impact Testing of Metallic Materials

    E112 Test Methods for Determining Average Grain Size

    E165/E165M Practice for Liquid Penetrant Examination for General Industry

    E399 Test Method for Linear-Elastic Plane-Strain Fracture Toughness KIc of Metallic Materials

    E428 Practice for Fabrication and Control of Metal, Other than Aluminum, Reference Blocks Used in Ultrasonic Testing

    E1290 Test Method for Crack-Tip Opening Displacement (CTOD) Fracture Toughness Measurement

    E1820 Test Method for Measurement of Fracture Toughness

    E1916 Guide for Identification of Mixed Lots of Metals

    Other Standards

    ANSI/ASMEB46.1 Surface Texture (Surface Roughness, Waviness and Lay) Available from American National Standards Institute (ANSI), 25 W. 43rd St., 4th Floor, New York, NY 10036, http://www.ansi.org.

    ASMEBoilerandPressur


    ICS Code

    ICS Number Code 77.140.85 (Iron and steel forgings)

    UNSPSC Code

    UNSPSC Code 31132100(Steel forgings)


    Referencing This Standard

    DOI: 10.1520/A0788_A0788M-14A

    ASTM International is a member of CrossRef.

    Citation Format

    ASTM A788 / A788M-14a, Standard Specification for Steel Forgings, General Requirements, ASTM International, West Conshohocken, PA, 2014, www.astm.org

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