The stainless steel pipe plant specializes in stainless steel pipe material classification Stainless steel pipe can be divided into Cr series (400 series), Cr-Ni series (300 series), Cr-Mn-Ni (200 series) and precipitation hardening system (600 series). .
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200 Series - Chromium-Nickel-Manganese Austenitic Stainless Steel 300 Series - Chromium-Nickel Austenitic Stainless Steel A, 301 - - - - - - - - - - - - - - - - - ----------- Excellent ductility for molding products. It can also be hardened by mechanical processing. Good weldability. The wear resistance and fatigue strength are better than 304 stainless steel.
Second, 302 ----- corrosion resistance with 304, due to the relatively high carbon content and therefore better strength.
Third, 303----- by adding a small amount of sulfur, phosphorus to make it easier than 304 cutting.
Fourth, 304 ----- 18/8 stainless steel. GB grade is 0Cr18Ni9. 309 - better temperature resistance than 304.
V. 316----- Following 304, the second most widely used type of steel, mainly used in the food industry, pharmaceutical industry and surgical equipment, add molybdenum elements to obtain a special structure of corrosion resistance. Because it has better resistance to chloride corrosion than 304 stainless steel, it is also used as "marine steel". SS316 is usually used in nuclear fuel recovery devices. 18/10 grade stainless steel pipes are also usually in line with this application level. Stainless Steel Bucket Model 321 - Except that the addition of titanium reduces the risk of material weld rust, the performance is similar to 304.
Series 400 - Ferritic and martensitic stainless steels.
408—Good heat resistance, weak corrosion resistance, 11% Cr, 8% Ni.
409 - The cheapest model (British and American), commonly used as automotive exhaust pipe, is a ferritic stainless steel (chrome steel).
410—Martensite (high strength chrome steel), good wear resistance, poor corrosion resistance.
416 - Added sulfur improves the material's processability.
420—"Blade-grade" martensitic steel, similar to Brinell's high chromium steel, the earliest stainless steel. Also used for surgical tools, can do very bright.
430—ferritic stainless steel, decorative, for example for automotive accessories. Good formability, but poor temperature resistance and corrosion resistance.
440—High-strength cutting tool steel with slightly higher carbon content. After appropriate heat treatment, it can obtain higher yield strength, and the hardness can reach 58HRC, which is among the hardest stainless steels. The most common application example is the "razor blade." There are three commonly used models: 440A, 440B, 440C, in addition to 440F (easy processing type).
Series 500 - Heat-resistant chromium alloy steel.
Series 600 - martensitic precipitation hardened stainless steel tube.
630—The most commonly used precipitation-hardening stainless steel model, also commonly called 17-4; 17% Cr, 4% Ni. 
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