ASTM A Standard Specification for Cold Finished Alloy Steel Bars. Find the most up-to-date version of ASTM A at Engineering See the chemical composition and physical properties of ASTM A Grade Steel, find alternative materials, and connect with suppliers.

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ASTM A | Speaking of Precision Blog

Consult the alloy supplier for information as to temperatures. In the carburized condition this alloy is used for gears, ring gears, shafts and crankshafts.

The alloy may be forged at F down ashm F a33 to the hardening heat treatment or carburizing. Forming characteristics of alloy are good in the annealed condition. There were over 19, cancelled or superceded specifications, commercial item descriptions and standards when I first prepared my list of Obsolete Federal Specifications for cold finished steel in Sometimes the replacement standard or specification contain different product requirements.

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A request for an assist always results in a prompt response from the appropriate supplier expert or an answer from PMPA Staff. This site uses cookies.

Following carburizing of heavy sections a reheat at F will enhance both case and core properties of the alloy. Cold working, as with machining, should be done to as close a tolerance as possible before heat treatment or carburizing.


This alloy is typically used for carburized parts where a hardened case is desired for wear resistance. Click Here to Email Me.

Distributors will offer small quantity buys while mills will generally only sell asgm quantities, with delivery times anywhere from 10 to 50 weeks depending on size and form required This material is stocked primarily in Bar Products by 59 distributors but is also available to a lesser extent in Flat Rolled Products, Tubular Products, Wire Products, Forging Products, and Casting Products.

The alloy may be welded by conventional methods, usually gas or arc welding. Where do you go for an assist when wierd, strange, and unusual specifications appear in a quote package?

Sign up for our Newsletter. Carburize at to F in an appropriate carburizing medium and oil quench to harden. Speaking of Precision Blog Sensemaking for the precision machining industry. Satm working may be accomplished prior to hardening a31 carburizing. Machining is done prior to carburizing to within as close a tolerance as possible.

From there it may be air cooled. Hardening is done by oil quench from F.

Machining may be done by conventional means prior to heat treatment – after carburizing axtm is z331 limited to grinding. These specifications, standards and descriptions often specify mandatory product attributes.

Tempering of carburized parts is done at to F and this will result in the alloy having a core strength of approximately ksi minimum with Rockwell C case hardness of The alloy may be cold worked in the annealed condition by conventional methods.


This alloy may be hardened by heating to F followed by a water quench. Create a free website or blog at WordPress. AISI is a hardenable chromium, molybdenum, nickel low alloy steel often used for carburizing to develop a case-hardened part.

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Asfm carburized case and core properties can be obtained by furnace cooling from carburizing at – F and then reheating to F. To find out more, including how to control cookies, see here: Preheating at F is beneficial and subsequent heating after welding is recommended – consult the approved weld procedure for the method used. Modulus of Elasticity Tension. The time to catch an obsolete specification is during contract review, before there are commitmemnts to material and or sunk costs of material, production and inspection.

Not applicable to this alloy. This case-hardening will result in good wear characteristics. By continuing to use this website, you agree to their use. Tempering of heat treated and water quenched parts not carburized is done at F to F with greater hardness the lower the tempering temperature. Mean Coeff Thermal Expansion.