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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Speaking of Precision Blog Sensemaking for the precision machining industry. In the carburized condition a31 alloy is used for gears, ring gears, shafts and crankshafts. Improved carburized case and core properties can be obtained by furnace cooling from carburizing at – F and then reheating to F. Click Here to Email Me.

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Consult the alloy supplier for information as to temperatures. The alloy may be cold worked in the annealed condition by conventional methods. Machining may be done by conventional means prior to heat treatment – after carburizing machining is usually limited to grinding.

This site uses cookies. Following carburizing of w331 sections a reheat at F will enhance both case and core properties of the alloy. Create a free website or blog at WordPress. Hot working may be accomplished prior sstm hardening or carburizing. The alloy may be forged at F down to F prior to the hardening heat treatment or carburizing.

ASTM A331 Grade 4140H

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. Mean Coeff Thermal Expansion.

ASTM A | Speaking of Precision Blog

From there it may be air cooled. Machining is done prior to carburizing to within as close a tolerance as possible. This case-hardening will result in good wear characteristics.

These specifications, standards and descriptions often specify mandatory product attributes.

AISI is a hardenable chromium, molybdenum, nickel low alloy steel often used for carburizing to develop a case-hardened part. There were over 19, cancelled or superceded specifications, commercial item descriptions and standards when I first prepared my list of Obsolete Federal Specifications for cold finished steel in For Email Marketing you can trust. This alloy may be hardened by heating to F followed by a water quench.

Tempering of heat treated and water quenched parts not carburized is done at F to F with greater hardness the lower the tempering temperature. Not applicable to this alloy. A request for an assist always results in a prompt response from the appropriate supplier expert or an answer from PMPA Staff. To find out more, including how to control cookies, see here: This alloy is typically used for carburized parts where a hardened case is desired for wear resistance.

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Forming characteristics of alloy are good in the annealed condition. Sometimes the replacement standard or specification contain different product requirements. By continuing to use this website, you agree to their use.

Where do you go for an assist when wierd, strange, and unusual specifications appear in a quote package? Cold working, as with machining, should be done to as close a tolerance as possible before heat treatment or carburizing.

The alloy may be welded by conventional methods, usually adtm or arc welding. Distributors will offer small quantity buys while mills will generally only sell large 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 a33 in Flat Rolled Products, S331 Products, Wire Products, Forging Products, and Casting Products.

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Hardening is done by oil quench from F. Carburize at to F in an appropriate carburizing medium and oil quench atsm harden. 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

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