ASTM-A921 Standard Specification for Steel Bars, Microalloy, Hot-Wrought, Special Quality, for Subsequent Hot Forging

ASTM-A921 - 1993 R16 EDITION - CURRENT
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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. The steel specimens shall be killed and shall conform to the fine grain size requirement. Heat analysis and product analysis shall be performed wherein the specimens shall conform to the required chemical compositions of vanadium, columbium, and molybdenum.

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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 exact equivalents; therefore, each system must be used independently of the other. Combining values from the two systems may result in nonconformance with the specification.

1.6 Unless the order specifies the applicable “M” specification designation, the material shall be furnished to the inch-pound units.

Keywords

carbon steel bars; microalloyed steel; steel bars;; ICS Number Code 77.140.20 (Steels of high quality)

To find similar documents by ASTM Volume:

01.05 (Steel--Bars, Forgings, Bearing, Chain, Tool)

To find similar documents by classification:

77.140.20 (Stainless steels Including alloyed steels, corrosion-resistant steels, heat-resisting steels, etc.)

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Document Number

ASTM-A921/A921M-93(2016)

Revision Level

1993 R16 EDITION

Status

Current

Modification Type

Reapproval

Publication Date

Sept. 1, 2016

Document Type

Specification

Page Count

3 pages

Committee Number

A01.15