The difference between the stainless steel and stainless iron, you know

Stainless steel is very common in daily life appliance, stainless steel kitchen utensils, stainless steel equipment, etc. , but the stainless iron a lot of people may be very strange, what is the difference between stainless steel and stainless steel, how to distinguish? Chemical water pump, usually adopt stainless steel 304316201, etc. Is a kind of stainless steel, stainless iron types are: 409, 410, 430, 444, belong to the martensite and ferrite stainless steel, with the magnets will have magnetic, austenitic stainless steel 201, 202, 304, 321, 316 l, etc. Stainless steel is the floorboard of the stainless steel and the acid steel in general. Stainless steel is weak media such as air, steam and water corrosion resistant steel, acid steel is refers to the chemical etching media such as acid, alkali, salt corrosion of the steel. The difference between stainless steel and stainless steel containing nickel composition of high and low. Stainless steel and stainless iron how to identify? Stainless steel ( Also known as stainless acid-resistant steel) Refers to the resistance to chemical medium such as air or acid corrosion of the steel. Stainless steel is not rusty, only on the corrosion behavior of different medium is different. Commonly used stainless steel commonly used stainless steel based on the characteristics of its organization, can be divided into martensite stainless steel and ferritic stainless steel and three types of austenitic stainless steel. 1, austenitic stainless steel in steel containing 18% Cr in 8 ~ 11% Ni, is austenitic stainless steel. Such as 1 cr18ni9 is a typical steel grade. This kind of steel because of the addition of nickel, enlarged the austenitic area, thus at room temperature can get single phase of metastable austenitic organization. Because of containing high chromium and nickel, and a single-phase austenitic organization, thus has higher chemical stability than chromium stainless steel, has better corrosion resistance, is the application of stainless steel. 18 - 8 stainless steel in annealing state organization of austenite + carbide, carbide exists, is of great damage to the corrosion resistance of steel, therefore usually use solid solution treatment methods, namely the steel is heated to 1100 ℃ after water, to dissolve carbide at high temperature of austenite, again by fast cooling, at room temperature on single-phase austenitic organization. 2, martensite stainless steel commonly used the carbon content of martensite stainless steel is 0. 1 to 0. 45%, chromium content of 12 ~ 14%, belong to the chromium stainless steel, usually refers to Cr13 stainless steel. Typical steel grade 1 cr13, 2 cr13 and 3 cr13, 4 cr13, etc. This kind of steel is generally used to make can withstand the load and corrosion resistance of various valve, pump, etc and some stainless tool etc. In order to improve the corrosion resistance, the carbon content of martensite stainless steel are controlled in a very low content scope, generally not more than 0. 4%. The lower carbon content, the corrosion resistance of steel is better, and the higher the carbon content, the higher the carbon content in the matrix, and the higher strength and hardness of the steel; Carbon content is higher, the formation of chromium carbide quantity is, the more its corrosion resistance becomes more worse. It is not hard to see from this, the strength of the 4 cr13, hardness index is better than that of 1 cr13, but its corrosion resistance is better than 1 cr13. 1 cr13 and 2 cr13 with air, steam and other medium corrosion resistance, is often used as corrosion of steel. In order to get good comprehensive performance, often using high temperature quenching + tempering, 600~700℃） , get tempered sorbite, to make turbine blade, boiler tube fittings, etc. And 3 cr13 and 4 cr13 steel, due to the high carbon content, corrosion resistance is relatively less, through the quenching + tempering at low temperature ( 200~300℃） , get tempered martensite, with high strength and hardness, HRC 50) , so often used as a tool steel, medical apparatus and instruments, cutting, hot oil pump shaft etc. 3 of the commonly used ferritic stainless steel and ferritic stainless steel carbon content less than 0. 15%, chromium content of 12 ~ 30%, also belong to chromium stainless steel, the typical steel grade 1 cr17ti have 0 1 cr17 cr13,,, 1 cr28, etc. Because the carbon content reduced accordingly, chromium content increases accordingly, the steel is heated from room temperature to high temperature ( 960~1100℃） Organization, and its microstructure is always single phase ferrite. The plastic, corrosion resistance, weldability is better than that of martensite stainless steel. For high chromium iron, ferrite stainless steel, the oxidation resistance of medium corrosion ability is stronger, with the increase of chromium content, corrosion resistance and to further improve. Adding titanium steel could refine the grain size, stable carbon and nitrogen, improving steel toughness and weldability. Ferritic stainless steel, as a result of heating and cooling without phase change, so can't use heat treatment to strengthen the steel. If the grain coarsening in the process of heating, can only be applied to improve cold plastic deformation and recrystallization organization, improve performance. If this kind of steel in 450 ~ 550 ℃, will cause the embrittlement of steel, called & other; 475 ℃ brittleness & throughout; 。 Through the heated to about 600 ℃ cold quickly again, can eliminate the embrittlement. Should also pay attention to this kind of steel in 600 ~ 800 ℃ heating for a long time also will produce hard and brittle & sigma; Phase, make the material produces & sigma; The brittleness. In addition, in more than 9250 c quenching, produces the intercrystalline corrosion tendency and grain coarsening of brittleness. The phenomenon of the welding parts are serious problems. The former can be resolved through 650 ~ 815 ℃ short temper. This kind of steel strength obviously lower than the martensitic stainless steel, mainly used in the manufacture of corrosion resistant parts, widely used in nitric acid and the nitrogen fertilizer industry. Commonly known as the stainless iron is ferritic and martensitic stainless steel stainless steel. To distinguish it from rust prevention performance is good, with the most common austenitic stainless steel.
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