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ASTM A29/A29M-20

ASTM A29/A29M-20

Standard Specification for General Requirements for Steel Bars, Carbon and Alloy, Hot-Wrought

2020-07-08 /Active

This guide covers a group of requirements for carbon and alloy steel bars under each of the following specifications: hot-rolled carbon steel bars, cold-finished carbon steel bars, hot-rolled alloy steel bars, and cold-finished alloy steel bars. Heat and product analysis shall be performed on several grades of carbon steel bars, wherein the material shall conform to the required chemical composition for carbon, manganese, phosphorus, and sulfur. Several grades of alloy steel bars shall also undergo heat and product analysis and shall meet the required chemical composition for carbon, manganese, phosphorus, sulfur, silicon, nickel, chromium, and molybdenum. When compositions other than those indicated in the specified chemical components are required, the composition limits shall be prepared using the specified ranges and limits for carbon steel and alloy steel. The material shall undergo grain size test and shall conform to the specified grain size requirement. Mechanical tests shall also be performed on the steel test specimens.


1.1 This specification2 covers a group of common requirements which, unless otherwise specified in the purchase order or in an individual specification, shall apply to carbon and alloy steel bars under each of the following ASTM specifications (or under any other ASTM specification which invokes this specification or portions thereof):

Title of Specification


Hot-Rolled Carbon Steel Bars:


 Steel Bars, Carbon, Quenched and Tempered


 Steel Bars and Shapes, Carbon Rolled from “T'' Rails


 Steel Bars, Carbon, Merchant Quality, M-Grades


 Steel Bars, Carbon, Hot-Wrought, Special Quality


 Steel Bars, Carbon, Merchant Quality, Mechanical Properties


 Steel Bars, Carbon, Hot-Wrought, Special Quality, Mechanical Properties


 Steel Bars for Springs, Carbon and Alloy


Cold-Finished Carbon Steel Bars:


 Steel Bars, Carbon and Alloy, Cold-Finished


 Cold-Drawn Stress-Relieved Carbon Steel Bars Subject to Mechanical Property Requirements


Hot-Rolled Alloy Steel Bars:


 Steel Bars, Alloy, Standard Grades


 Carbon and Alloy Steel Bars Subject to End-Quench Hardenability Requirements


 Steel Bars, Alloy, Hot-Wrought or Cold-Finished, Quenched and Tempered


 Steel Bars, Alloy, Hot-Wrought, for Elevated Temperature or Pressure-Containing Parts, or Both


Cold-Finished Alloy Steel Bars:


 Steel Bars, Alloy, Hot-Rolled or Cold-Finished, Quenched and Tempered


 Steel Bars, Carbon, Hot-Wrought or Cold-Finished, Special Quality, for Pressure Piping Components




A These designations refer to the latest issue of the respective specifications, which appear either in the Annual Book of ASTM Standards, Vol 01.05, or as reprints obtainable from ASTM.

1.2 In case of any conflict in requirements, the requirements of the purchase order, the individual material specification, and this general specification shall prevail in the sequence named.

1.3 The values stated in either inch-pound units or SI 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 used independently of the other, and values from the two systems shall not be combined.

1.4 For purposes of determining conformance to this specification and the various material specifications referenced in 1.1, dimensional values shall be rounded to the nearest unit in the right-hand place of figures used in expressing the limiting values in accordance with the rounding method of Practice E29.

Note 1: Specification A29/A29M previously listed dimensional tolerances for cold-finished bars; these are now found in Specification A108.

1.5 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.

1.6 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.

alloy steel bars; carbon steel bars; cold finished steel bars; general delivery requirements; hot wrought steel bars; steel bars;
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