General Information Principal Design Features steel has a higher 0. It is hardenable by heat treatment, quench and tempering to develop to ksi tensile strength. Applications Used for crankshafts, couplings and cold headed parts. Forming Forming of steel in the annealed condition is readily accomplished. Welding steel is weldable by all of the welding methods. However with its higher carbon content it is important to use both pre-heat at to F and post-heat at to F practice per an approved welding procedure.
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You are on page 1of 6 Search inside document Designation: A 90b Reapproved Standard Specication for Steel Bars, Carbon, Hot-Wrought, Special Quality1 This standard is issued under the xed designation A ; the number immediately following the designation indicates the year of original 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.
Scope 1. Special quality bar applications include forging, heat treating, cold drawing, machining, and many structural uses. A guide for the selection of steel bars is contained in Practice A Hot-wrought special quality carbon steel bars are produced in cut lengths and coils; the manufacturer should be consulted regarding sections and sizes available in coils, produced to a chemical composition.
Referenced Documents 2. Ordering Information 3. NOTE 1A typical ordering description is as follows: 10 lb, carbon steel bars, hot rolled 1 in.
Current edition approved March 1, Published March Originally approved in Last previous edition approved in as A 90b Materials and Manufacture 4. The primary melting may incorporate separate degassing or rening and may be followed by secondary melting using electroslag remelting or vacuum arc remelting.
Where secondary melting is employed, the heat shall be dened as all of the ingots remelted from a single primary heat.
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