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). 200 Series - Cr-Ni-Mn Austenitic Stainless Steel 300 Series - Cr-Ni Austenitic Stainless Steel 301 - Good ductility, used for molded products. Can also be hardened rapidly by machining. Weldability is good. Wear resistance and fatigue strength superior to 304 stainless steel. 302 - corrosion resistance with 304, due to the relatively high carbon content and therefore better strength. 303- By adding a small amount of sulfur and phosphorus to make it easier to cut and process than 304. 304- i.e. 18/8 stainless steel. GB grade 0Cr18Ni9. 309- has better temperature resistance than 304. 316 - After 304, the second most widely used steel grade, mainly used in the food industry, pharmaceutical industry and surgical equipment, the addition of molybdenum to obtain a special corrosion-resistant structure. 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 devices. 18/10 grade stainless steel is also commonly used in this application. [1] Stainless Steel Bucket
Type 321 - Similar properties to 304 except that the addition of titanium reduces the risk of corrosion in the weld seams of the material. 400 Series - Ferritic and martensitic stainless steels. 408 - Good heat resistance. 408-Good heat resistance, weak corrosion resistance, 11% Cr, 8% Ni. 409-The cheapest type (British and American), usually used as automobile exhaust pipes, is a ferritic stainless steel (chromium steel). 410-Martensitized (high strength chromium steel), good wear resistance, poor corrosion resistance. 416 - Sulfur is added to improve the machinability of the material. 420-"Sharpening grade" martensitic steel, similar to Brinell high-chromium steel, the earliest stainless steel. Also used for surgical knives and can be made very bright. 430 - Ferritic stainless steel, decorative, e.g. for car accessories. Good formability, but temperature resistance and corrosion resistance are poor. 440-High strength cutting tool 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 grades: 440A, 440B, 440C, and 440F (easy-to-machine). 500 Series - Heat-resistant chromium alloy steel. 600 Series - Martensitic precipitation hardening stainless steel. Stainless steel 630 - the most commonly used precipitation hardening stainless steel type, usually also called 17-4; 17%Cr, 4%Ni
Serial No. Category No. Characteristics and Uses 1. Austenitic 1Cr17Mn6Ni5N nickel section of the steel type, instead of the grade 1Cr17Ni7, cold working with magnetic. Used for railroad cars. 2. 1Cr18Mn8Ni5N nickel-saving steel, replacing 1Cr18Ni9. 3. 1Cr17Ni7 has high strength after cold working. Railroad cars, conveyor belts, bolts and nuts. 4. 1Cr18Ni9 has high strength after cold working, but the elongation is a little worse than 1Cr17Ni7. Decorative parts for construction. Y1Cr18Ni9 Improves cutting and corrosion resistance. Most suitable for automatic lathes. Bolts and nuts. Y1Cr18Ni9Se Improves cutting and abrasion resistance. Most suitable for automatic lathe. Rivets and screws. 7. 0Cr19Ni9 as stainless heat-resistant steel is the most widely used, food equipment, general chemical equipment, atomic energy industry. 8. 00Cr19Ni9 as stainless heat-resistant steel is the most widely used, food equipment, general chemical equipment, atomic energy industry. 8. 00Cr19Ni11 lower carbon content than 0Cr19Ni9 steel, superior resistance to intergranular corrosion, for the welded parts without heat treatment. 9. 0Cr19Ni9 steel, the most widely used as a stainless steel, food equipment, general chemical equipment, atomic energy industry. 9. 0Cr19Ni9N in the grade 0Cr19Ni9 on the addition of N, increased strength, plasticity does not decrease. Make the thickness of the material is reduced. As a structural strength components. 10. 0Cr19Ni10NbN in the grade 0Cr19Ni9 on the addition of N and Nb, with 0Cr19Ni9N and the same characteristics and uses. Stainless steel stair railings
11. 00Cr18Ni10N in the grade 00Cr19Ni11 on the addition of N, with the same characteristics of the above grades, the use of the same as 0Cr19Ni9N, but better resistance to intergranular corrosion. 12. 1Cr18Ni12 compared with 0Cr19Ni9, work hardening. Spinning processing, special drawing, cold heading. 13. 0Cr23Ni13 corrosion resistance, heat resistance than 0Cr19Ni9 good. 14. 0Cr25Ni20 Oxidizing than 0Cr23Ni13 good. In fact, more as a heat-resistant steel. 15. 0Cr17Ni12Mo2 in seawater and other media, corrosion resistance than 0Cr19Ni9 good. Mainly for pitting corrosion-resistant materials. 16. 0Cr18Ni12Mo2Ti is used for sulfuric acid, phosphoric acid, ant acid, acetic acid equipment, good resistance to intergranular corrosion. 17. 00Cr17Ni14Mo2 for 0Cr17Ni12Mo2 ultra-low carbon steel, better than 0Cr17Ni12Mo2 intergranular corrosion resistance. 18. 0Cr17Ni12Mo2 for sulfuric acid, phosphoric acid, acetic acid equipment, good resistance to intergranular corrosion. 18 ．0Cr17Ni12Mo2N in the grade 0Cr17Ni12Mo2 to add N, improve strength, do not reduce the plasticity, so that the thickness of the material is thinned. For better corrosion resistance and higher strength parts. 19 ． 00Cr17Ni13Mo2N in grade 00Cr17Ni14Mo2 add N, with the same characteristics of the above grades, the use of the same with 0Cr17Ni12Mo2, but better crystal corrosion resistance. 20. 0Cr18Ni12Mo2Cu2 corrosion resistance, pitting corrosion resistance is better than 0Cr17Ni12Mo2. Used for sulfuric acid resistant materials. 21. 00Cr18Ni14Mo2Cu2 for 0Cr18Ni12Mo2Cu2 ultra-low carbon steel, better than 0Cr18Ni12Mo2Cu2 intergranular corrosion resistance 22. 0C19Ni13Mo3 point corrosion resistance than 0Cr17Ni12Mo2. For dyeing equipment materials. 23. 00Cr19Ni13Mo3 for 0Cr19Ni13Mo3 ultra-low carbon steel, better than 0Cr19Ni13Mo3 intergranular corrosion resistance. 24. 0Cr18Ni16Mo5 Heat exchanger for absorbing chloride-containing solutions, acetic acid equipment, phosphoric acid equipment, bleaching devices, etc., used in 00Cr17Ni14Mo2 and 00Cr17Ni13Mo3 can not be applied to the environment. 25 ． 1Cr18Ni9Ti for welding core, antimagnetic instrumentation, medical equipment, acid-resistant containers and equipment lined transport piping and other equipment and parts. 26 ． 0Cr18Ni11Ti add Ti to improve the resistance to intergranular corrosion, not recommended for decorative parts. 27. 0Cr18Ni11Nb with Nb to improve intergranular corrosion resistance. 28. 28. Austenitic stainless steel 0Cr18Ni9. Stainless steel with austenitic organization at room temperature. Steel containing Cr about 18%, Ni 8% to 10%, C about 0.1%, with a stable austenitic organization. Austenitic chromium-nickel stainless steel, including the famous 18Cr-8Ni steel and on the basis of the increase in Cr, Ni content and the addition of Mo, Cu, Si, Nb, Ti and other elements to develop a high Cr-Ni series of steel. Austenitic stainless steel is non-magnetic and has high toughness and plasticity, but the strength is low, it is not possible to make it strengthened by phase change, only through cold working for strengthening. If you add S, Ca, Se, Te and other elements, it has good machinability. Such steel in addition to oxidizing acid medium corrosion resistance, if it contains Mo, Cu and other elements can also be resistant to sulfuric acid, phosphoric acid, as well as formic acid, acetic acid, urea and other corrosion. The carbon content of such steel if less than 0.03% or Ti, Ni, can significantly improve its resistance to intergranular corrosion performance. High silicon austenitic stainless steel concentrated nitric acid Ken has good corrosion resistance. As a result of the austenitic stainless steel has a comprehensive and good overall performance, in all walks of life in a wide range of applications. 29. 0Cr18Ni13Si4 in grade 0Crl 9Ni9 increase Ni, add Si, improve stress corrosion fracture resistance. Used in environments containing more chloride ions. 30. Austenitic - ferritic duplex stainless steel 0Cr26Ni5Mo2 is austenitic and ferrite organization of about half of the stainless steel. In the case of low C content, Cr content of 18% to 28%, Ni content of 3% to 10%. Some steels also contain Mo, Cu, Si, Nb, Ti, N and other alloying elements. This type of steel has both austenitic and ferritic stainless steel features, compared with ferritic, plasticity, toughness is higher, no room temperature brittleness, intergranular corrosion resistance and welding performance are significantly improved, while also maintaining a ferritic stainless steel 475 ℃ brittleness and thermal conductivity is high, with superplasticity and other characteristics. Compared with austenitic stainless steel, high strength and resistance to intergranular corrosion and chloride stress corrosion has improved significantly. Duplex stainless steel has excellent pore corrosion resistance, is also a nickel-saving stainless steel. 31. 1Cr18Ni11Si4A1Ti production of high temperature concentrated nitric acid medium parts and equipment 32. 00Cr18Ni5Mo3Si2 has a ferrite-nasaloidal duplex organization, good resistance to stress corrosion rupture performance, pitting corrosion resistance and 00Crl7Nil3M02 comparable to a higher strength for chloride-containing environments, used in oil refining, chemical fertilizer, papermaking, Fertilizer, paper, petroleum, chemical and other industrial heat exchangers and condensers, etc. 33 ferritic 0Cr13A1 cooling from high temperatures does not produce significant hardening, turbine materials, quenching parts, composite steel 34 00Cr12 than 0Crl3 carbon content is low, bending properties of the welded parts, machining properties, high temperature oxidation resistance. For automobile exhaust treatment device, boiler combustion chamber, nozzle 35. ferritic stainless steel 1Cr17 in the use of the state of ferrite organization of stainless steel. Chromium content in 11% ~ 30%, with body-centered cubic crystal structure. This kind of steel generally does not contain nickel, sometimes also contains a small amount of Mo, Ti, Nb and other elements, this kind of steel has a large coefficient of thermal conductivity, coefficient of expansion is small, good oxidation resistance, good resistance to stress corrosion and other characteristics, mostly used in the manufacture of atmospheric corrosion, water vapor, water and oxidizing acid corrosion-resistant parts. This type of steel exists in poor plasticity, plasticity and corrosion resistance after welding is significantly reduced and other shortcomings, thus limiting its application. The application of extra-oven refining technology (AOD or VOD) can make carbon, nitrogen and other interstitial elements greatly reduced, so that this type of steel to obtain a wide range of applications. Mostly used for building interior decoration, heavy oil burner parts, household appliances, household appliances parts! 36. Y1Cr17 than lCrl7 improve cutting performance. Used for automatic lathes, bolts, nuts, etc. 37. 1Cr17Mo is an improved grade of 1Crl7, more resistant to salt solution than lCrl7, used as automobile exterior materials. 38. 00Cr30Mo2 High O-Mo system, C, N is reduced to a very low level. Corrosion resistance is very good. Used for equipment related to organic acids such as acetic acid and lactic acid, and for manufacturing caustic soda equipment. Resistant to halogen ion stress corrosion rupture, resistance to pitting corrosion 39. 00Cr27Mo2 Requirements for performance, use, corrosion resistance and soft magnetism similar to 00Cr30M02 40. martensitic 1Cr12 as turbine blades and high stress parts of a good stainless and heat-resistant steel 41. Martensitic Stainless Steel 1Cr13 heat treatment can be adjusted to adjust the mechanical properties of the stainless steel, commonly known as a class of hardening stainless steel, is a class of stainless steel. Hardenable stainless steel. Typical grades for the 1Cr13 type, such as 2Cr13, 3Cr13, 4Cr13 and so on. Higher hardness after fire, different tempering temperature with different toughness combinations, mainly used for steam turbine blades, cutlery, surgical instruments. According to the difference in chemical composition, martensitic stainless steel can be divided into martensitic chromium steel and martensitic chromium-nickel steel two categories. According to the different organization and strengthening mechanism, can also be divided into martensitic stainless steel, martensite and semi-austenitic (or semi-martensitic) precipitation hardening stainless steel and martensitic aging stainless steel. 42. 1Cr13Mo is a high strength steel grade with higher corrosion resistance than 1Crl3. Turbine blades, high temperature parts. 43 ．Y1Cr13 stainless steel in the best cutting performance of the steel. It is used for automatic lathes. 44. 2Cr13 has high hardness and good corrosion resistance in hardened condition. Good corrosion resistance. For turbine blades. 45. 3Cr13 has higher hardness than 2Cr13 after quenching, and is used for cutting tools, nozzles, valve seats and valves. Valve seat, valve, etc. 46. 3Cr13Mo for high hardness and high wear resistance of hot oil pump shaft, valve piece, valve bearings, medical stakes spring and other parts. 47. Y3Cr13 improve the hardness of 2Cr13 after quenching, for knife edge tool. 47. Y3Cr13 improve 3Crl corrosion cutting performance of steel. 48. 1Cr17Ni12 has a high strength of nitric acid and organic acid corrosion-resistant components. Cellar and equipment. 49. 7Cr17 Higher strength nitric acid and organic acid corrosion resistant parts. Cellar and equipment. 50. 8Cr17 hardened state, harder than 7Crl7, but higher than 11Crl7 toughness. For cutting tools, valves. 51. 11Cr7 In all stainless steel, heat-resistant steel, the amount of hardness is high. For nozzles, bearings. 52. Y11Cr17 In 11Crl7 to improve the cutting ability of 7 steel. For automatic lathes. 53. 0Cr17Ni4Cu4Nb Precipitation hardening steel grade with added copper. Shafts, turbine parts.