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Introduction to Surface Hardening of Steels

case-hardened part Consequently a high car-bon potential may be suitable for short carbur-izing times but not for prolonged carburizing Selection of carbon potential also depends on the carburizing response of a particular steel Carburizing Steels Carburizing steels for case hardening usually have base-carbon contents of approximately

440C is a high carbon straight chromium high hardenability martensitic stainless steel generally supplied in the annealed condition with a maximum Brinell hardness of 269 (Rc29) or annealed and cold drawn with a maximum Brinell hardness of 285 (Rc31) Characterised by good corrosion resistance in mild domestic and industrial environments including fresh water organic

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Metal forging is a metal forming process that involves applying compressive forces to a work piece to deform it and create a desired geometric change to the material The forging process is very important in industrial metal manufacture particularly in the extensive iron and steel manufacturing industry

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AISI 4140 is a chromium-molybdenum alloy steel The chromium content provides good hardness penetration and the molybdenum content ensures uniform hardness and high strength AISI 4140 chrome-molybdenum steel can be oil hardened to a relatively high level of hardness The desirable properties of the AISI 4140 include superior toughness good

GUIDE TO STAINLESS STEEL FINISHES Mechanically Polished and Brushed Finishes The number of additional finishing processes can be minimised by selecting as the starting point the closest mill finish to the desired end result Applied finishes will have a direct bearing on the surface appearance and the environ-mental performance of the

BLASTING TECHNICAL INFORMATION FACTORS THAT AFFECT BLAST FINISHING ARE: 1 Media delivery systems 2 Blast containment enclosures media recovery and dust collection systems 3 Media used in industrial blasting systems 1 MEDIA DELIVERY SYSTEMS There are three media delivery systems that propel and deliver media for high speed impact to the part

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Common media for quenching include special-purpose polymers forced air convection freshwater saltwater and oil Water is an effective medium when the goal is to have the steel to reach maximum hardness However using water can lead to metal cracking or becoming distorted

The Difference Between Casting Forging Casting is the process where metal is heated until molten While in the molten or liquid state it is poured into a mold or vessel to create a desired shape Forging is the application of thermal and mechanical energy to steel billets or ingots to cause the material to change shape while in a solid state

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