ASTM A921/A921M-93(2022)
Standard Specification for Steel Bars, Microalloy, Hot-Wrought, Special Quality, for Subsequent Hot Forging

Standard No.

ASTM A921/A921M-93(2022)

Release Date

2022

Published By

American Society for Testing and Materials (ASTM)

Latest

ASTM A921/A921M-93(2022)

Scope

1.1 This specification covers hot-wrought, special quality microalloyed carbon steel bars intended for use as hot forging stock. The bars shall be hot-wrought, as-wrought, unless thermal treatment is necessary to ensure cold shearability. 1.2 The bars shall be furnished to chemical composition only. Chemical composition is based on standard carbon steel grades modified to include microalloying elements such as columbium (niobium), vanadium, or molybdenum. Desired mechanical properties are developed in the subsequent hot forging and controlled cooling operations. 1.3 Sections and sizes of bar steel available are covered in Specification A29/A29M. 1.4 Supplementary Requirements S1 to S6 are provided for use when additional controls or requirements are desired. These shall apply only when specified on the purchase order. 1.5 The values stated in either inch-pound units or SI units are to be regarded separately as standard. Within the text and tables, 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. 1.6 Unless the order specifies the applicable “M” specification designation, the material shall be furnished to the inchpound units. 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.

ASTM A921/A921M-93(2022) Referenced Document

• ASTM A29/A29M Standard Specification for Steel Bars, Carbon and Alloy, Hot-Wrought and Cold-Finished, General Requirements for
• ASTM A576 Standard Specification for Steel Bars, Carbon, Hot-Wrought, Special Quality
• ASTM A788/A788M Standard Specification for Steel Forgings, General Requirements
• ASTM E45 Standard Test Methods for Determining the Inclusion Content of Steel

ASTM A921/A921M-93(2022) history

• 2022 ASTM A921/A921M-93(2022) Standard Specification for Steel Bars, Microalloy, Hot-Wrought, Special Quality, for Subsequent Hot Forging
• 2016 ASTM A921/A921M-93(2016) Standard Specification for Steel Bars, Microalloy, Hot-Wrought, Special Quality, for Subsequent Hot Forging
• 1993 ASTM A921/A921M-93(2011) Standard Specification for Steel Bars, Microalloy, Hot-Wrought, Special Quality, for Subsequent Hot Forging
• 1993 ASTM A921/A921M-93(2005) Standard Specification for Steel Bars, Microalloy, Hot-Wrought, Special Quality, for Subsequent Hot Forging
• 1993 ASTM A921/A921M-93(1999) Standard Specification for Steel Bars, Microalloy, Hot-Wrought, Special Quality, for Subsequent Hot Forging