Introduction to Stainless Steel

Stainless steels are corrosion resistant steels with a minimum of 10.5 per cent of chromium (Cr). The family or type terms ferritic, martensitic, austenitic and duplex are introduced. The main property of stainless steels, their corrosion resistance, is outlined. The affect of chromium, nickel and molybdenum on corrosion resistance is mentioned. Other useful properties of stainless steels, such as their high (oxidation resistance) and low (cryogenic) temperature resistance and work hardening are also mentioned. Welding, brazing and soldering as joining methods are also described briefly. A short list of example grades, such as 1.4016 (430S17) 1.4512 (409S19) ferritics, 1.4028 (420S45) martensitic, 1.4362 1.4462 (2205) duplex, 1.4301 (304) 1.4307 (304S11) 1.4404 (316S31) 1.4541 (321S31) 1.4539 (904L) and 1.4547 (6% Mo) are also shown.


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