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 sstm form required This x331 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.

ASTM A331 Grade 4718

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 is 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. 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 – consult the approved weld procedure for the method used. This alloy may be hardened by heating to F followed by a water quench.

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

Carburize at to F in an appropriate carburizing medium and oil quench to harden. Improved carburized wstm and core properties can be obtained by furnace cooling from carburizing at – F and then reheating to F. 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 or 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 close 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 in the alloy having a core strength of approximately ksi minimum with Rockwell C case hardness of Tempering of heat treated and water quenched parts not carburized is done at F zstm 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. This alloy is typically used for carburized parts where a hardened case is desired for wear resistance.

Mean Coeff Thermal Expansion. Modulus of Elasticity Tension.