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

An optical comparator test is made of a mold from each new or reground die measuring the internal geometry of the die. Workmanship, Finish, and Appearance The yield strength shall be determined at 0. Seams deeper than that stated above are rejected.


The bars are furnished in two classes, A and B. To further improve quality, Niagara LaSalle reduced the standard seam depth tolerance satm StressProof from 0.

Although it also can be induction hardened, it should be watched for quench cracks. Ground and Polished with special close tolerances available on order. The aztm relieving temperature selection is based on 60 years of experience and thorough documentation.

Resulfurized steels are not subject to inclusion ratings.

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

Every order is inspected for surface defects with a magnetic or roto bar tester. One class, B, is cold drawn with higher than normal heavy drafts to provide higher strength levels, and four grades provide improved machinability. The values stated in each system are not exact equivalents, therefore, each system must be used independently of the other.


This specification covers cold-drawn, stress-relieved carbon steel bars subject to mechanical property requirements.

A311 Class B Stressproof TG&P

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.

If this test indicates stresses are out of specification, the die is not used. You can rely on Niagara LaSalle for all of your steel bar needs. astn

Niagara LaSalle developed this groundbreaking process in and forever changed the economics of part production. A lot shall consist of bars of the same size from the same heat which have been stress relieved in the same stationary furnace charge. Within the text, the SI units are shown in brackets. This was followed by the highest temperature stress relieving treatment possible to obtain a combination of properties, including strength, wear resistance, minimum warpage and excellent machinability.

Link to Active This link will always route to the current Active version of the standard. The degree of restriction and the number of elements so restricted are both subject to agreement between the manufacturer and the purchaser. A uniform material which provides exceptional quality for Production, maintenance or special machine parts.

Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. The cast or heat analysis shall conform to the chemical composition requirements specified.


Combining values from the two systems may result in nonconformance with the specification. Nonmetallic Inclusion Requirements Microscopical S4.

Tension test shall be made to conform to the requirements specified. Routine warpage tests are also conducted throughout the life of the die. Details of these requirements shall be agreed upon between the manufacturer and the purchaser.

Within the text, the SI units are shown in brackets. Historical Version s – view previous versions of standard.

A Steel Bar | Capital Steel & Wire

Therefore, a warpage test is always performed on the first bar drawn through either a new or reground die. Class A are normal-draft cold-drawn and stress-relieved rounds, squares, hexagons, and flats. Within the limits of good manufacturing and inspection practices, the bars shall be free of injurious seams, laps, segregation, or other imperfections that, due to their nature, degree, or extent, will interfere with the use of the material in machining or fabrication of suitable parts.

To learn more about StressProof or any of our specialty products, please contact us. Combining values from the two systems may result in nonconformance with the speci?