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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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 extent in Flat Rolled Products, Tubular Products, Wire Products, Forging Products, and Casting Products.

AISI is a hardenable chromium, molybdenum, nickel low alloy steel often used for carburizing to develop a case-hardened part.

This case-hardening will result in good wear characteristics. In the carburized condition this alloy is used for gears, ring gears, shafts and crankshafts. Machining adtm done prior to carburizing to within as close a tolerance as possible.


Machining may be done by conventional means prior to heat treatment – after carburizing machining is usually limited to grinding. Forming characteristics of alloy are good in the annealed condition.

ASTM A | Speaking of Precision Blog

The alloy may be welded by conventional methods, usually gas or arc welding. Preheating at F is beneficial and subsequent heating after welding is recommended – qstm the approved weld procedure for the method used.

This alloy may be hardened by heating to F followed by a water quench.

Carburize at to F in an appropriate carburizing medium and oil quench to harden. Improved carburized case and core properties can be obtained by furnace cooling from carburizing at – F and then reheating to F.

ASTM A331 Rods for Construction, Length: 3 & 6 m

The alloy may be forged at F down to F prior to the hardening heat treatment or carburizing. Hot working may be accomplished prior to hardening astmm carburizing. Consult the alloy supplier for information as to temperatures.

The alloy may be cold worked in the annealed condition by conventional methods. Cold working, as with machining, should be done to as ashm a tolerance as possible before heat treatment or carburizing. From there it may be air cooled. Not applicable to this alloy.


Tempering of carburized parts is done at to F and this will result astj the alloy having a core strength of approximately ksi minimum with Rockwell C case hardness of Tempering a3311 heat treated and water quenched parts not carburized is done at F to F with greater hardness the lower the tempering temperature. Hardening is done by oil quench from F. Following carburizing of heavy sections a reheat at F will enhance both case and core properties of the alloy.

Alloy Steels Material Property Data Sheet – Product availability and request a quote

This alloy is typically used for carburized parts where a hardened case is desired for wear resistance. Mean S331 Thermal Expansion. Modulus of Elasticity Tension.