(Identical to ASTM Specification A /A M (R) except for deletion of , revision of Table 1 footnote A, and editorial corrections to Table 2.) 1. A Class B Stressproof TG&P Cold Finished Bar Round Turned Ground Polished, A Round Bar, A Rod, A TG&P Rod, A TG&P Round Rod . See the chemical composition and physical properties of ASTM A Grade cold-drawn, stress relieved, annealed bar, find alternative materials, and.

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It covers multiple grades and numerous conditions of stress-relieved cold drawn bars to meet minimum mechanical property requirements. Combining values from the satm systems may result in nonconformance with the speci? If restraightened, then the same number of tests are again required. One class, B, is cold drawn with a311 than normal heavy drafts to provide higher strength levels, and four grades provide improved machinability. This specification covers cold-drawn, stress-relieved carbon steel bars subject to mechanical property requirements.

Niagara Lasalle Steel Products – Stressproof ®, ASTM A, Cold Rolled Steel Round Rod

Class A are normal-draft cold-drawn and stress-relieved rounds, squares, hexagons, and flats. Materials and Manufacture 6. Restricted Incidental Elements S2.

Parts you are now heat treating from Rc 23 to Rc Seams deeper than this are rejectable. One class, B, is cold drawn with higher than normal heavy drafts to provide higher aastm levels, and four grades provide improved machinability. The area of the sample to be examined should be agreed upon between the purchaser and the manufacturer, and the test specimen should be hardened by heating and quenched before being polished to avoid pits.


Tension test shall be made to conform to the requirements specified. Within the text, the SI units are shown in brackets. NOTE 2— When turned bars are speci? This was followed by the highest temperature stress relieving treatment possible astj obtain a combination of properties, including strength, wear resistance, minimum warpage and excellent machinability.

The degree of restriction and the number of elements so restricted are both subject to agreement between the manufacturer and the purchaser. Nonmetallic Inclusion Requirements Microscopical S4. A lot q311 consist of bars of the same size from the same heat which have been stress relieved in the same stationary furnace charge.

A Steel Bar | Capital Steel & Wire

Within the limits of good manufacturing and inspection practices, the bars shall be free of injurious seams, laps, segregation, or other imperfections asfm, due to their nature, degree, or extent, will interfere with the use of the material in machining or fabrication of suitable parts.

Where secondary melting is employed, the heat shall be de? The yield strength shall be determined at 0.

Maximum seam depth of 0.

Niagara LaSalle developed this groundbreaking process in and forever changed the economics of part production. Have questions about your specific products?

If this test indicates stresses are out of specification, the die is not used. The importance of high temperature stress relieving to obtain maximum ductility, minimum warpage and excellent machinability is a major part of the original patent.


Niagara LaSalle is exceptionally responsive to the needs of our customers and puts a high priority on providing uniformity in the machinability of our products in order to improve productivity for you. The bars are a31 in two classes, A and B. Resulfurized steels are not subject to inclusion ratings.


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. To further improve quality, Niagara LaSalle reduced the standard seam depth a311 for StressProof from 0.

Warpage tests are also regularly made as part of a standard quality assurance procedure. The report shall include the name ast, the manufacturer, ASTM designation and year date and revision letter, if any, class and grade, heat number, size, and grain size if requested.

A311 Steel Bar

The result is a steel bar product that meets stringent standards and provides a wide variety of benefits, including:. The cast or heat analysis shall conform to the chemical composition requirements specified. Although it also can be induction hardened, it should be watched for quench cracks.

The heavy draft stress-relieved Class B came atm existence with the release of the specification.