Stainless steel grades 200 – chrome – nickel – manganese series, 300 series – chrome – nickel, 301, 302, 303, 304, 309, 316, 321, 400 series – ferritic and martensitic stainless steel, 408, 409, 410, 416, 420, 430, 440, 500 series – heat resistant chromium alloy steel, 600 series – martensitic precipitation hardening stainless steel.
Stainless Steel Grades Group
Series 200 – chrome-nickel – manganese austenitic stainless steel
The 300 series – chrome-nickel austenitic stainless steel
Model 301 – good ductility, for molding products; Also can rapidly harden by mechanical processing. Good weldability. Abrasion resistance and fatigue strength is better than that of 304 stainless steel.
Model 302-304, has corrosion resistance due to the relatively high carbon intensity and better.
Model 303 – adding a small amount of sulfur and phosphorus from 304 is more likely to machining.
Model 304 – GM model; The 18/8 stainless steel. GB brand of 0 cr18ni9.
Model 309 – compared with 304 has better temperature resistance.
Model 316 – after 304, the second to get the most widely used types of steel, mainly used in the food industry and surgical equipment, add molybdenum elements make it get a kind of corrosion-resistant special structure. As compared with 304, it has a better ability to resist chloride corrosion and therefore as “Marine steel” to use. SS316 is usually used for nuclear fuel recycling equipment. 18/10 grade stainless steel usually also fits the application level.
Model 321 – except for adding the titanium reduces the weld material corrosion risk besides other performance similar to 304.
Series 400 – ferritic and martensitic stainless steel
Weak model 408 – good heat resistance, corrosion resistance, 11% Cr, 8% Ni.
Model 409 – the cheapest model, commonly used in the automobile exhaust pipe, is ferritic stainless steel (chrome steel).
Model 410 – martensite chromium steel (high strength), good wear resistance, corrosion resistance is poor.
Model 416 – added sulfur improved the processing properties of materials.
Model 420 – level “RJ” martensitic steel, such as the Brinell high chromium steel stainless steel at the earliest. Also used in surgical tools, it can be very light.
Model 430 – ferritic stainless steel, decoration, such as for car accessories. Good formability, but the temperature resistance and corrosion resistance to poor.
Model 440 – cutting steel, high strength carbon is a bit high after appropriate heat treatment can obtain higher yield strength and hardness can reach 58 HRC, belongs to the most hardened stainless steel. The most common application example is the “razor blade. There are three commonly used models: 440 a, 440 b, 440 c, and 440 f (processing).
Series 500 – heat-resistant chrome alloy steel
The 600 series – martensitic precipitation hardening stainless steel
Model 630 – the most common precipitation hardening stainless steel models, usually also called 17-4ph;