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ASTM A311 / A311M - 04(2010) Standard Specification for Cold-Drawn, Stress-Relieved Carbon Steel Bar

ASTM A311 / A311M

This specification covers cold-drawn, stress-relieved carbon steel bars subject to mechanical property requirements. The bars are furnished in two classes, A and B. Class A are normal-draft cold-drawn and stress-relieved rounds, squares, hexagons, and flats. Class B are heavy-draft cold-drawn and stress-relieved rounds and hexagons. The steel shall be made by one or more of the following primary processes: open-hearth, basic-oxygen, or electric-furnace. The cast or heat analysis shall conform to the chemical composition requirements specified. Tension test shall be made to conform to the requirements specified.

This abstract is a brief summary of the referenced standard. It is informational only and not an official part of the standard; the full text of the Standard itself must be referred to for its use and application. ASTM does not give any warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up to date.

1. Scope


1.1 This specification covers two classes, nine grades, and four conditions of stress-relieved cold-drawn carbon steel bars produced to mechanical property requirements. One class, B, is cold drawn with higher than normal (heavy) drafts to provide higher strength levels, and four grades provide improved machinability.

1.2 Supplementary Requirements, S1 through S6, of an optional nature are provided.

1.3 The values stated in inch-pound units or SI units are to be regarded as the Standard. Within the text, the 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.


2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the Standard.
ASTM Standards

A29/A29M Specification for steel Bars, Carbon and Alloy, Hot-Wrought, General Requirements for
A108 Specification for steel Bar, Carbon and Alloy, Cold-Finished
A370 Test Methods and Definitions for Mechanical Testing of steel Products
E527 Practice for Numbering Metals and Alloys in the Unified Numbering System (UNS)


Index Terms


carbon steel bars; cold finished steel bars; steel bars; Carbon steel bars/shapes--specifications; Cold-drawn steel bars; Hardenability (steel)--specifications; Stress-relieved steel bars; Structural steel (SS) bars--specifications;




ICS Code


ICS Number Code 77.140.60 (Steel bars and rods)



DOI: 10.1520/A0311_A0311M-04R10

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ASTM A311 / A311M (Steel Standards)
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