Machining of stainless steels and super alloys: traditional by Helmi A. Youssef

By Helmi A. Youssef

Provides a complete description for machining applied sciences of stainless steels and large alloys with attention to present business applications.

  • Presents present and up to date advancements with regards to conventional and nontraditional machining strategies of stainless steels and great alloys
  • Arranges different types of stainless steels and tremendous alloys in qualitative and quantitative shape, as on the topic of their machining characteristics,  supplying the reader with information about optimal operating situation for every material
  • Proposes a 10-level machinability chart to rank vital grades of stainless steels
  • Arranges the machinability score of the main regular tremendous alloys in a descending order
  • Presents non-traditional machining methods besides a few hybrid tactics that have been utilized effectively to stainless steels and tremendous alloys

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Extra resources for Machining of stainless steels and super alloys: traditional and nontraditional techniques

Sample text

Martensitic alloys are used for applications such as cutlery, surgical tools, instruments, valves, rivets, screws, hand tools, vegetable choppers, razor blades, riffle barrels, mining machinery, bolts, nuts, and aircraft fittings. 3). This category makes up over 70% of the total stainless steel production. 15% C, a minimum of 16% Cr, and sufficient Ni and/or Mn to retain an austenitic structure at all temperatures from the cryogenic region to the melting point of the alloy. These alloys cannot be hardened by heat treatment and are nonmagnetic.

2. 3). 3 are free‐machining versions, since they contain free‐ machining additives such as S and Se. As Austenitic alloys are costly they should not be specified where less expensive ferritic or martensitic alloys would be adequate. Austenitic alloys of standard series 300 may cost twice as much as the ferrite variety due to their expensive alloying elements (Ni and Cr). Mn and N (series 200) are substituted for some of the Ni to produce a lower cost, but of somewhat lower‐ quality alloy. Austenitic alloys are used in a wide variety of applications, such as kitchenware, fittings, welded constructions, lightweight transportation equipment, furnace and heat exchanger parts, and equipment for several chemical environments.

Nitrogen, N In austenitic and duplex stainless steels, nitrogen increases the resistance to localized pitting attack and intergranular corrosion. Nitrogen when added, it provides strengthening to SSs. 8. Niobium, Nb Its addition prevents intergranular corrosion, particularly in the HAZ (heat affected zone) after welding. Nb helps preventing the formation of chromium carbides that can rob the microstructure of the required amount of Cr for passivation. In ferritic stainless steels, the addition of Nb is an effective way to improve the thermal fatigue resistance.

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