ASTM A788/A788M-18 - 1.3.2018
 
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 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

Carbon and 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 Continuous 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

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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.

1.9 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.

 
2. Referenced Documents

A1021/A1021M-26

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

A966/A966M-15(2025)

Standard Practice for Magnetic Particle Examination of Steel Forgings Using Alternating Current

A1058-19

Standard Test Methods for Mechanical Testing of Steel Products´Metric

A470/A470M-05(2025)

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

A471/A471M-19(2024)

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

A504/A504M-18(2023)

Standard Specification for Wrought Carbon Steel Wheels

A508/A508M-23a

Standard Specification for Quenched and Tempered Vacuum-Treated Carbon and Alloy Steel Forgings for Pressure Vessels (Includes all amendments and changes 11/30/2023).

A521-A521M-06

Standard Specification for Steel, Closed-Impression Die Forgings for General Industrial Use

A541-A541M-05

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

A551/A551M-08(2023)

Standard Specification for Carbon Steel Tires for Railway and Rapid Transit Applications

A579-A579M-20

Standard Specification for Superstrength Alloy Steel Forgings (Withdrawn 2024)

A427-A427M-10

Standard Specification for Wrought Alloy Steel Rolls for Cold and Hot Reduction

A469/A469M-07(2022)

Standard Specification for Vacuum-Treated Steel Forgings for Generator Rotors

E428-08

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

E1290-08

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

E1820-25de2

Standard Test Method for Measurement of Fracture Toughness (Includes all amendments and changes 8/17/2026).

E1916-24

Standard Guide for Identification of Mixed Lots of Metals

ANSI/ASME B46.1

Surface Texture (Surface Roughness, Waviness and Lay)

ASME Boiler and Pressure Vessel Code

SAE AMS 2750

Pyrometry

A982/A982M-10(2025)

Standard Specification for Steel Forgings, Stainless, for Compressor and Turbine Airfoils

A751-25

Standard Test Methods and Practices for Chemical Analysis of Steel Products

A765/A765M-24

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

A768-A768M-05

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

A833-19

Standard Test Method for Indentation Hardness of Metallic Materials by Comparison Hardness Testers

A837/A837M-17(2022)

Standard Specification for Steel Forgings, Alloy, for Carburizing Applications

A859/A859M-23

Standard Specification for Age-Hardening Alloy Steel Forgings for Pressure Vessel Components

A891/A891M-24

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

A909/A909M-06(2026)

Standard Specification for Steel Forgings, Microalloy, for General Industrial Use

A939-A939M-15

Standard Practice for Ultrasonic Examination from Bored Surfaces of Cylindrical Forgings

A940-A940M-06

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

A941-26a

Standard Terminology Relating to Steel, Stainless Steel, Related Alloys, and Ferroalloys (Includes all amendments and changes 4/15/2026).

A965/A965M-26

Standard Specification for Steel Forgings, Austenitic, for Pressure and High Temperature Parts

A649/A649M-25

Standard Specification for Forged Steel Rolls Used for Corrugating Paper Machinery

A668/A668M-23

Standard Specification for Steel Forgings, Carbon and Alloy, for General Industrial Use

A711/A711M-17(2022)

Standard Specification for Steel Forging Stock

A723/A723M-18a(2023)

Standard Specification for Alloy Steel Forgings for High-Strength Pressure Component Application (Includes all amendments and changes 4/17/2023).

A729/A729M-17(2022)

Standard Specification for Carbon and Alloy Steel Axles, Heat-Treated, for Mass Transit and Electric Railway Service

A983/A983M-06(2026)

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

A986/A986M-01(2026)

Standard Specification for Magnetic Particle Examination of Continuous Grain Flow Crankshaft Forgings

A991/A991M-25

Standard Test Method for Conducting Temperature Uniformity Surveys of Furnaces Used to Heat Treat Steel Products

A266/A266M-24

Standard Specification for Carbon Steel Forgings for Pressure Vessel Components

A275/A275M-23

Standard Practice for Magnetic Particle Examination of Steel Forgings

A288-18(2023)

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

A592/A592M-24

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

A646/A646M-25

Standard Specification for Premium Quality Alloy Steel Blooms and Billets for Forgings

A289-A289M-97

Standard Specification for Alloy Steel Forgings for Nonmagnetic Retaining Rings for Generators

A290/A290M-26

Standard Specification for Carbon and Alloy Steel Forgings for Rings for Reduction Gears

A291/A291M-26

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

A336/A336M-23

Standard Specification for Alloy Steel Forgings for Pressure and High-Temperature Parts

A370-26

Standard Test Methods and Definitions for Mechanical Testing of Steel Products

A372/A372M-20(2025)

Standard Specification for Carbon and Alloy Steel Forgings for Thin-Walled Pressure Vessels

A388/A388M-26

Standard Practice for Ultrasonic Examination of Steel Forgings

E23-25

Standard Test Methods for Notched Bar Impact Testing of Metallic Materials

E112-25

Standard Test Methods for Determining Average Grain Size

E165/E165M-23

Standard Practice for Liquid Penetrant Testing for General Industry

E380-93

Standard Practice for Use of the Internation System of Units (SI) (the Modernized Metric System) (Withdrawn 1997)

E399-24

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

A1049/A1049M-18(2023)

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