ASTM A311 PDF

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. The stress relieving temperature selection is based on 60 years of experience and thorough documentation. The heavy draft stress-relieved Class B came into existence with the release of the specification. Therefore, a warpage test is always performed on the first bar drawn through either a new or reground die. Warpage tests are also regularly made as part of a standard quality assurance procedure.

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More A 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.

Scope 1. One class, B, is cold drawn with higher than normal heavy drafts to provide higher strength levels, and four grades provide improved machinability. 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.

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