ASTM-A920 › Historical Revision Information
Standard Specification for Steel Bars, Microalloy, Hot-Wrought, Special Quality, Mechanical Properties
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This specification covers standards for hot-wrought, special quality microalloyed carbon steel bars intended for use in applications where as-rolled mechanical properties are desired. A typical end use includes hydraulic cylinder shafts. The typical chemical composition of microalloyed carbon steel shall contain carbon, manganese, phosphorus, sulfur, and vanadium. Heat and product analyses shall be conducted wherein the material shall conform to the required chemical composition for vanadium, columbium (niobium), and molybdenum. The elements and specified chemical ranges shall not exceed the required limits. The steel bars shall undergo tension test and conform to the mechanical property requirements such as yield strength, tensile strength, and elongation.
Scope
1.1 This specification covers hot-wrought, special quality microalloyed carbon steel bars intended for use in applications where as-rolled mechanical properties are desired. A typical end use is hydraulic cylinder shafts.
1.2 The bars shall be furnished to chemical composition and mechanical properties as provided herein. Chemical composition is based on standard carbon steel grades modified to include microalloying elements such as columbium (niobium), vanadium, or molybdenum. Three strength classes are available, designated 75 [520], 80 [550], and 100 [690], corresponding to the minimum yield strength in ksi.
1.3 Sections and sizes of bar steels available are covered in Specification A 29/A 29M
1.4 Supplementary Requirements S1 to S5 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; Carbon steel bars/shapes--specifications; Hot wrought steel bars--specifications; Microalloy steel--specifications; ICS Number Code 77.140.20 (Steels of high quality)
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Document Number
ASTM-A920/A920M-07
Revision Level
2007 EDITION
Status
Superseded
Modification Type
Revision
Publication Date
Nov. 1, 2007
Document Type
Specification
Page Count
3 pages
Committee Number
A01.15