Designation: A – 91 (Reapproved ) e1 Standard Specification for Steel Bars, Alloy, Standard Grades 1 This s. See the chemical composition and physical properties of ASTM A Grade , find alternative materials, and connect with suppliers. Alloy Hot Rolled Round Steel Bar ASTM A Hot rolled alloy bars are used when increased strength, toughness, wear resistance and fatigue resistance are .

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These steels can be expected to contain 0. Bar applications include forging, heat treating, cold drawing, machining and many structural components Note 1.

Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend. Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor service astm. Where secondary remelting is employed, the heat shall be defined as all of the cast product remelted from a single primary heat.

This abstract is a brief summary of the referenced standard. This standard has been approved for use by agencies of the Department of Defense.

Where minimum and maximum sulfur contents are shown, it is indicative of resulfurized steel Silicon may be speci? The producer should be consulted in establishing the proper practice. Such steels are identi? Link to Active This link will always route to the current Active version of the standard. This standard is subject to revision at any time by the responsible technical committee and must be reviewed every?

Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. Aircraft Quality or Magna? If the usual titanium additive is not permitted, the steels can be expected to contain up to 0. This low carbon nickel chromium molybdenum alloy is a low cost steel with good carburized properties.


This medium carbon, chromium-molybdenum, through-hardening alloy steel has a good hardenability with high strength and toughness as well as good fatigue and impact resistance after heat treating. 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. It is the most widely used carburizing alloy.

The steel shall be furnished as strand cast or ingot cast. Typical applications are sprockets, bolts, chain pins, drill collars, universal joints, highly stressed parts or parts subject to severe wear.

Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters. A superscript epsilon e indicates an editorial change since the last revision or reapproval.

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

Typical applications would be camshafts, axles, shafts, pistons, gears and bearings.

Standard – Standard Specification for Steel Bars, Alloy, Standard Grades ASTM A –

For best machining, it is often used in the annealed condition; however, when the amount of machining necessary is minimal or asttm the risk of distortion in heat treating a finished part is paramount, it is typically used in the quenched and tempered condition.

Cold Working Quality S4. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the risk of a3222 of such rights, are entirely their own responsibility.

Hot rolled alloy bars are used when increased strength, toughness, wear resistance and fatigue resistance are required. Typical applications for hot rolled bar include gears, pinions, shafts, and other applications where it is helpful to have a steel that can be readily machined and carburized to controlled case depths.


Workmanship, Finish, astj Appearance 7. ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentioned in this standard.

ASTM A – 13() Standard Specification for Steel Bars, Alloy, Standard Grades

The report shall include the name of the manufacturer, ASTM designation and year date and revision letter, if any, type and grade, heat number, qstm size. Materials and Manufacture 5.

See Supplementary Requirement S9 or S Where secondary melting is employed, the heat shall be de? Immediately after hot forming, the bars shall be allowed asm cool to a temperature below the critical range under suitable conditions to prevent imperfections caused by too rapid cooling.

A — 91 Reapproved e1 Standard Speci? Current edition approved Aug.

ASTM A322 1991 Standard Specification for Steel Bars, Alloy, Standard Grades

Cold Shearing Quality S3. This specification covers hot-wrought alloy steel bars. The nickel content contributes to case toughness at high strength with above average core toughness. These elements are considered as incidental and may be present to the astmm maximum amounts: A guide for the selection of steel bars is contained in Practice A Sections and sizes of bar steel available are covered in Speci? The chromium and molybdenum a3222 the proper formation of carbides resulting in good surface hardness and wear.

Grain Size Fine S B Standard alloy steels can be produced asym a lead range of 0. The bars shall be free of pipe, cracks, and flakes. ASTM Spec. It can be readily nitride for improved surface wear. The need for 0.

Historical Version s – view previous versions of standard.