Stainless steel 455 is a martensitic, age-hardenable alloy yielding strength characteristics that are roughly 3 times the strength of standard 304 stainless. 445 resists staining in normal atmospheres and shows no corrosion in fresh water, good ductility and toughness. This alloy is extremely stable during heat-treating making it able to be machined to close tolerance prior to aging.
17-4, also known as 630 stainless, can be heat treated to high levels of strength and hardness, and good for machining and is corrosion resistant. Often used in petroleum and chemical industries, as well as in aircraft parts.
303 Stainless machines well and cuts clean and maintains it resistance to corrosion in temperatures up to 1500 degrees F. Good applications include repeat machining, fittings and fasteners.
Type 403 stainless is a corrosion and heat resistant 12% Cr martensitic alloy, very similar to stainless type 410, with the exception of a slightly lower maximum silicon content and a slightly lower maximum chromium content. Good levels of strength, toughness and ductility may be obtained with this alloy.
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