Normas de calidad

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn. Contact ASTM International (www.astm.org) for the latest information

Designation: A 108 – 03

Standard Specification for

Steel Bar, Carbon and Alloy, Cold-Finished1
This standard is issued under the fixed designation A 108; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A superscript epsilon (e) indicates an editorial change since the last revision or reapproval. This standard has been approved for use by agencies of the Department of Defense.

1. Scope 1.1 This specification covers cold-finished carbon and alloy steel bars producedin straight length and coil to chemical compositions. Cold-finished bars are suitable for heat treatment, for machining into components, or for use in the as-finished condition as shafting, or in constructional applications, or for other similar purposes (Note 1). Grades of steel are identified by grade numbers or by chemical composition.
NOTE 1—A guide for the selection of steel bars is containedin Practice A 400.

1.2 Some end uses may require one or more of the available designations shown under Supplementary Requirements. Supplementary requirements shall apply only when specified individually by the purchaser. 1.3 The values stated in inch-pound units are to be regarded as the standard. The values given in parentheses are for information only. 2. Referenced Documents 2.1 ASTMStandards: 2 A 29/A 29M Specification for Steel Bars, Carbon and Alloy, Hot-Wrought. General Requirements for A 304 Specification for Carbon and Alloy Steel Bars Subject to End-Quench Hardenability Requirements A 322 Specification for Steel Bars, Alloy, Standard Grades A 370 Test Methods and Definitions for Mechanical Testing of Steel Products A 400 Practice for Steel Bars, Selection Guide, Composition, andMechanical Properties A 510 Specification for General Requirements for Wire Rods and Coarse Round Wire, Carbon Steel A 576 Specification for Steel Bars, Carbon, Hot-Wrought, Special Quality

A 700 Specification for Packaging, Marking, and Loading Methods for Steel Products for Domestic Shipment E 45 Test Methods for Determining the Inclusion Content of Steel E 112 Test Methods for Determining theAverage Grain Size E 381 Method of Macroetch Testing Steel Bars, Billets, Blooms, and Forgings E 527 Practice for Numbering Metals and Alloys (UNS) E 1077 Test Method for Estimating the Depth of Decarburization of Steel Specimens E 29 Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications 2.2 Other Documents: SAE Handbook and SAE J1086 Recommended Practice forNumbering Metals and Alloys (UNS)3 Federal Standard 66 C Steel, Chemical Composition and Hardenability4 ISS Steel Bar Product Guideline for Bar Steel5 3. Terminology 3.1 Definition: 3.1.1 product tolerance levels—cold-finished steel bar is produced with up to four (4) increasingly tight tolerance levels, for the individual product characteristics, dependent on the method of manufacture necessary tomeet purchaser-ordered specification requirements. (Product Tolerance Level 1 is selected, unless otherwise specified by purchaser.) 4. Ordering Information 4.1 Orders for cold-finished steel bar to this specification should include the following items to adequately describe the material: 4.1.1 Name of material, 4.1.2 ASTM specification number and date of issue, 4.1.3 Chemical composition, gradedesignation or limits, 4.1.4 Silicon level, if required,
3 Available from Society of Automotive Engineers (SAE), 400 Commonwealth Dr., Warrendale, PA 15096-0001. 4 Available from the Standardization Documents Order Desk, Bldg. 4, Section D, 700 Robbins Ave., Philadelphia, PA 19111-5094 Attn: NPODS. 5 Available from American Iron and Steel Institute (AISI), 1101 17th St., NW, Suite 1300, Washington,...