Stainless Steel Grades Applications

Stainless steel models, according to the composition can be divided into Cr system (400 series), Cr-Ni system (300 series), Cr-Mn-Ni (200 series) and precipitation hardening system (600 series).

Commonly used stainless steel grade hardness table #

200 Stainless Steel Series - Chromium-Nickel-Manganese austenitic stainless steel(Controversial use in food) #

201,202, etc.: austenitic stainless steel, manganese instead of nickel, corrosion resistance is relatively poor, widely used in China as a cheap alternative to the 300 series.

300 Stainless Steel Series - Chromium-Nickel Austenitic Stainless Steel #

Austenitic, non-magnetic or weakly magnetic. Chromium-nickel austenitic stainless steel. Due to compositional segregation during smelting or improper heat treatment, a small amount of martensite or ferrite organization in austenitic 304 stainless steel can be caused. In this way, 304 stainless steel will have magnetic properties in it.

• 301 Stainless Steel - Ductile and used for molded products. Can also be hardened rapidly by machining. Weldability is good. Wear resistance and fatigue strength superior to304 stainless steelThe
• 302 stainless steel - corrosion resistance with 304, due to the relatively high carbon content and therefore better strength.
• 303 Stainless Steel - By adding small amounts of sulfur and phosphorus to make it easier to cut and machine than 304.
• 304 Stainless Steel - Generic type; i.e. 18/8 Stainless Steel.GB grade 0Cr18Ni9.
• 309 Stainless Steel - Better temperature resistance than 304.
• Stainless steel 316 - after 304, the second most widely used grade, mainly in the food industry and surgical equipment, with the addition of molybdenum to give it a special structure that resists corrosion. It is also used as a "marine steel" due to its better resistance to chloride corrosion than 304, while SS316 is commonly used in nuclear fuel recovery units. 18/10 grade stainless steel is also commonly used in this application.
• 321 Stainless Steel - Properties are similar to 304 except that the addition of titanium reduces the risk of corrosion in the welds of the material.

400 Stainless Steel Series - Ferritic and Martensitic Stainless Steels #

Martensitic or ferritic type, magnetic.

• Model 408 Stainless Steel - Good heat resistance, weak corrosion resistance, 11% of Cr, 8% of Ni.
• Model 410 Stainless Steel - Martensitic (high strength chromium steel), good wear resistance, poor corrosion resistance.
• Model 416 Stainless Steel - Sulfur has been added to improve the machinability of the material.
• Type 420 Stainless Steel - "Cutting Edge Grade" martensitic steel, similar to Brinell High Chrome Steel, the earliest of the stainless steels. Also used for surgical knives and can be made very bright.
• Type 430 stainless steel - ferritic stainless steel, decorative, e.g. for car accessories. Good molding properties, but temperature resistance and corrosion resistance to be poor.
• Type 440 stainless steel - high-strength cutting edge steel, slightly higher carbon content, after appropriate heat treatment can obtain high yield strength, hardness can reach 58HRC, belong to the hardest stainless steel. The most common application example is "razor blades". There are three commonly used types: 440A, 440B, 440C, and 440F (easy-to-machine type).

500 Stainless Steel Series-Heat Resistant Chromium Alloy Steels #

600 Stainless Steel Series - Martensitic precipitation hardening stainless steel. #

• 630 stainless steel - most commonly usedPrecipitation hardening stainless steelModels, often also called 17-4; 17%Cr, 4%Ni.