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Classified according to the composition of Cr stainless steel pipe (400 series), Cr-Ni (300 series), Cr-Mn-Ni (200 series) and precipitation hardening (600 series). 200 series-chromium-nickel-manganese austenitic stainless steel 300 series-chromium-nickel austenitic stainless steel.

301—–ductile, for forming products. Can also be machined fast hardening. Good weldability. Abrasion resistance and fatigue strength than 304 stainless steel.
302—–corrosion resistance with 304, due to the relatively high carbon intensity is better.

303—–by adding a small amount of sulfur and phosphorus make it easier for 304 machining.
304—–18/8 stainless steel. GB grades for 0Cr18Ni9. 309-have a better temperature resistance than 304.
After 316—–following the 304, the second most widely used steel, mainly for the food industry, pharmaceutical and surgical equipment, adding molybdenum to give it a special corrosion-resistant structure. Compared with 304 stainless steel tube, because it has better resistance to chloride corrosion and thus “shipping steel” to use. SS316 is usually used for nuclear fuel recycling equipment. 18/10 stainless steel pipe is usually in line with the application level.
Model 321-apart from added titanium reduces the risk of weld corrosion properties similar to 304.
400 series-ferritic and Martensitic stainless steels.

408-good heat resistance, low corrosion resistance, 11% Ni Cr,8%.
409-the cheapest model (British and American), usually used as automobile exhaust pipes, is a ferritic stainless steel (chromium steel).
410-martensite (high strength steel), good wear resistance, corrosion resistance is poor.
416-sulfur added to improve the processing properties of the material.
420-“cutting class” Martensitic steels, stainless steel similar to Brandt’s high chromium steel the first. Also used for surgical tools, can be very bright.
430-ferritic stainless steel, decorative, for example for car accessories. Good formability, but worse in heat resistance and corrosion resistance.
440-cutting tool steel with high strength, carbon is slightly higher, after suitable heat treatment can obtain a higher yield strength, hardness 58HRC, belongs to the most hardened stainless steel columns. The most common example is the application of “razor blade”. There are three commonly used models: 440A, 440B, 440C, another 440F (processing).
500 series-heat-resisting chromium steel.

600 series-Martensitic precipitation hardening stainless steel tube.

Source: http://www.steel-tubes.com/