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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A request for an assist always results in a asym response from the appropriate supplier expert or an answer from PMPA Staff. Improved carburized case and core properties can asm obtained by furnace cooling from carburizing at – F and then reheating to F.
These specifications, standards and descriptions often specify mandatory product attributes. There were over 19, cancelled or superceded specifications, commercial item descriptions and standards when I first prepared my list of Obsolete Federal Specifications for cold finished steel in In the carburized condition this alloy is used for gears, ring gears, shafts and crankshafts.
Preheating at F is beneficial and subsequent heating after welding is recommended – aatm the approved weld procedure for the method used. From there it may be air cooled. 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 Speaking of Precision Blog Sensemaking for the precision machining industry.
Forming characteristics of alloy are good in the annealed condition. To find out more, including how to control cookies, see here: This alloy may be hardened by heating to F followed asgm a water quench.
This alloy is typically used for carburized parts where a hardened case is desired for w331 resistance. Consult the alloy supplier for information as to temperatures.
ASTM A331 Grade 4140H
Hot working may be accomplished prior to hardening or carburizing. Sometimes the replacement standard or specification contain different product requirements. 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.
Machining may be done by conventional means prior to heat treatment – after carburizing machining is usually limited to grinding. This case-hardening will result in good wear characteristics. Hardening is done by oil quench from F.
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Mean Coeff Thermal Expansion. 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.
By continuing to use this website, you agree to their use. The alloy may be cold worked in the annealed condition by conventional methods. AISI is a hardenable chromium, molybdenum, nickel low alloy steel often used for carburizing to develop a case-hardened part.
The alloy may be welded by conventional methods, usually gas or arc welding. Carburize at to F in an appropriate carburizing medium and oil quench to harden.
Following carburizing of heavy sections a reheat at F will enhance both case and core properties of the alloy. Sign up for our Newsletter.
Tempering of heat treated and water quenched parts not carburized is done at F to F with greater hardness the lower the tempering temperature.
Cold working, as with machining, should be done to as close a tolerance as possible before heat treatment or carburizing.