Molybdenum – to increase corrosion resistance (particularly in sulfite, sulfate, acetic acid and acetate solutions and salt water atmosphere), increase creep resistance, increase strength at elevated temperatures, expand range of passivity and counteract tendency to pit.Manganese – to improve hot working properties, increase yield and tensile strengths (above 2%), partially replace nickel and stabilize the austenitic structure.Silicon – to increase scaling resistance and resist carburizing at high temperatures.Nickel – to stabilize the austenitic structure, improve forming properties, increase ductility, high temperature strength and corrosion resistance (particularly in industrial and marine atmospheres, chemical, food and textile processing industries).Suncor uses this type in some products such as Quick Attach Wedges, however, these parts have a plating to protect against further corrosion. Varieties such as grade 440 find major applications as products that must resist atmospheric oxidation, mildly corrosive chemicals and wet or dry corrosion. ![]() The Martensitic grades are hardenable by heat treatment and are magnetic. Ferritic grades are magnetic and nonhardenable. Suncor Stainless does not typically use ferritic grades of stainless steel. They can be softened by “annealing” heat treating. However, they can be magnetic to a small degree, especially in formed parts. The Austenitic grades are generally nonmagnetic and hardenable only by cold working. Grade 304 and 316 are the most important members of the Austenitic family and are the most widely used. Suncor Stainless mainly uses grade 304 and 316 stainless steel from the 300 series.
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