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.

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

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

A473

Stainless Steel Forgings

A504/A504M

Wrought Carbon Steel Wheels

A508/A508M

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

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

A705/A705M

Age-Hardening Stainless Steel Forgings

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

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

A965/A965M

Steel Forgings, Austenitic, for Pressure and High Temperature Parts

A982/A982M

Steel Forgings, Stainless, for Compressor and Turbine Airfoils

A983/A983M

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

A1090/A1090M

Forged Rings and Hollows for Use as Base Plates in Power Transmission Structures

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 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.

1.8 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.