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Stainless steel 310S is austenitic chromium, nickel stainless steel (.08% max carbon) with good oxidation resistance and strength at high temperatures. It resist oxidation in continuous service up to 2000ºF gave decreasing sulphur gasses are not present. It is additionally utilized for intermittent service at temperatures up to 1900°F due to it resists rescaling and has a low coefficient of expansion. This factor reduces the tendency of the steel to warp in heat service. 310s are same as 310 aside from lower carbon content to minimize carbide precipitation during welding.
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US 309/309S (UNS S30900/S30908) steel
TYPES 309 AND 309S are austenitic chromium-nickel stainless steels that provide excellent corrosion resistance and heat resistance plus good strength at room and elevated temperatures. Type 309S is identical to Type 309 except for a lower carbon content that minimizes carbide precipitation and improves weldability.
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Type 416HT Stainless Steel is a stainless steel which is martensitic and has been hardened by heat treatment to higher strength and hardness levels.
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Alloy 409 is a general purpose, chromium, titanium stabilized, ferritic stainless steel whose primary application is automotive exhaust systems. It contains 11% chromium which is the minimum amount for the formation of the passive surface film which gives stainless steels their corrosion resistance.
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With better strength at higher temperatures, Type 422 (S42200) is an appealing alternative to Type 403. Type 422 is a hardenable martensitic stainless steel which is being widely used for high temperatures up to 1200°F. It is capable of being heat treated to various high strength levels. It is often used in aircraft and power industries who require high strength/weight ratios from room temperature to 1200°F.
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Alloy 420 is a hardenable, martensitic stainless steel that is a modification of Alloy 410. Similar to 410, it contains a minimum of 12% chromium, just sufficient enough to give corrosion resistant properties. Alloy 420 has higher carbon content than Alloy 410 which is designed to optimize strength and hardness characteristics. It has good ductility it the annealed condition but is capable of being hardened up to Rockwell hardness 50 HRC, the highest hardness of the 12% chromium grades.
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