Why do stainless steel putty knives use 3Crl13 stainless steel as material

Click: Time:2017-05-18 15:57:57

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Stainless steel is a steel that is not easily rusted, and in fact some stainless steel, both rust and acid (corrosion resistance). Stainless steel's stainless and corrosion resistance is due to the formation of the rich chromium-oxide film (passivated film) on its surface. The rust and corrosion are relative. Experiment shows that the steel in the atmosphere, the weak medium such as water and nitric acid oxidation, such as medium, its corrosion resistance increased with the increase of the water content of chromium in steel, when the chromium content reaches a certain percentage of steel corrosion resistance mutation, that is, from easy to rust is not easy to rust, never corrosion resistant to corrosion. There are many ways of classifying stainless steel. According to the structure of the structure at room temperature, the size of markov, austenitic body, ferrite and bi-phase stainless steel; According to the main chemical constituents, the two main systems can be made of chromium stainless steel and chrome stainless steel. Part with nitric acid resistant stainless steel, resistant to sulfuric acid according to the use of stainless steel, resistant to salt water stainless steel, etc., according to the points can be divided into the resistance to pitting corrosion type stainless steel, resistant to stress corrosion of stainless steel, stainless steel intergranular corrosion resistance, etc.; It can be classified into non-magnetic stainless steel, easy cutting stainless steel, low temperature stainless steel, high strength stainless steel etc. Because the stainless steel material has excellent corrosion resistance, formability, compatibility, and in a wide temperature range series features such as strong toughness, so in heavy industry, light industry, supplies industry and building decoration and other industries have extensive application. 

Austenitic stainless steel: stainless steel with austenitic tissue at room temperature. With Cr approximately 18%, Ni 8% ~ 10%, C about 0.1%, it has stable austenitic tissue. The austenitic chromic stainless steel includes the famous 18cr-8ni steel and the high cr-ni series of steel that increases Cr and Ni content and adds Mo, Cu, Si, Nb, Ti and other elements. Austenitic stainless steel is non-magnetic and has high toughness and plasticity, but the strength is low, can not be strengthened by phase change, only can be strengthened through cold processing. If you add S, Ca, Se, Te, etc., the elements are very easy to cut. This type of steel can be corroded by oxidizing acid, such as Mo, Cu, etc., etc. If the carbon content of such steel is less than 0.03% or Ti and Ni, the corrosion resistance can be improved. High silica austenitic stainless steel nitric acid Ken has good corrosion resistance. Because austenitic stainless steel has comprehensive and good comprehensive performance, it is widely used in all walks of life. 

Ferrite stainless steel: stainless steel, which is predominantly made of ferritic, in use. The chromium content is 11% ~ 30%, with body centered cubic crystal structure. This kind of steel is generally not containing nickel, sometimes also contains a small amount of Mo, Ti, Nb elements, this kind of steel with heat conduction coefficient is big, small expansion coefficient, good oxidation resistance, good resistance to stress corrosion, etc, used in the manufacture of air, water vapor and water resistant and oxidizing acid corrosion of components. This kind of steel has disadvantages such as plastic difference, post-weld plasticity and corrosion resistance, so it restricts its application. The application of ovens (AOD or VOD) is widely used to make carbon, nitrogen and other interstitial elements greatly reduced. 

Austenitic - ferrite duplex stainless steel: it is the stainless steel of about half of the austenitic and ferrite tissues. In the case of low C, the Cr content was 18% ~ 28%, and Ni content was 3% ~ 10%. Some steel also contain elements such as Mo, Cu, Si, Nb, Ti and N. This kind of steel both austenite and ferrite stainless steel, the characteristics of compared with ferrite, plasticity and toughness is higher, no room temperature brittleness, intergranular corrosion resistance and welding performance are significantly increased, while maintaining a ferritic stainless steel of 475 ℃ brittleness and high thermal conductivity, has the characteristics of superplasticity. Compared with austenitic stainless steel, high strength and intercrystalline corrosion and chlorinated stress corrosion were significantly improved. Two-phase stainless steel has excellent corrosion resistance and is also a type of stainless steel. 

Martensitic stainless steel: stainless steel that can adjust its mechanical properties through heat treatment, which is a kind of hardened stainless steel. The typical number is Cr13, such as 2Cr13, 3Cr13, 4Cr13 etc. The hardness is higher after the fire, different tempering temperature has different toughness combination, mainly for steam turbine blade, tableware, tool, surgical instrument. According to the chemical composition difference, martensitic stainless steel can be divided into martensitic chrome steel and martensitic chrome nickel steel. According to the different organizations and strengthening mechanism, also can be divided into martensite stainless steel, martensite and austenite (or half martensitic precipitation hardening stainless steel and maraging stainless steel, etc 

Stainless steel is the biggest difference between iron and stainless steel: stainless steel is not attracted to magnets, while iron and stainless iron can... It is true that there is no magnetism, but in the process of manufacturing, because of the material in the process of production and the iron mold... The lengthening magnetism will fade away. Stainless steel is much higher than brass. It's like white copper... Three parts: cold rolled, cold rolled medium and stainless steel wire. 

Stainless steel has the characteristic of the following aspects, the first characteristic is corrosion resistance, all metal will react with oxygen in the atmosphere, formed in the surface oxygen membrane. In general, the steel oxide film is loose, the substrate will continue to oxidize, which will cause the corrosion to expand and eventually form a cavity, which will invalidate the steel structure. Although it can be used to protect the surface by using paint or oxidized metal, the steel is corroded once it is damaged. The stainless steel oxide film is compact and protects the substrate from oxidation. The film is extremely thin, and through it can see the natural luster of the surface, making the stainless steel have a unique surface. If the protective membrane is damaged, the lotuses in steel and the oxygen in the atmosphere re-create the oxidation film and continue to protect. The second characteristic is environmental protection, stainless steel does not rust, do not cause any pollution to use environment, can be 100% recycled, is a kind of green environmental protection product, accord with sustainable development strategy. From these two characteristics, it is actually a potential economy, because it is more expensive than the average material, and of course it will last much longer. General steel structure will gradually failure due to rust, stainless steel not rust, long service life, when not in use can be completely recycled, recycle, don't waste of resources. Although the price is more expensive than the ordinary steel, it is cheaper to use in the long run. This is the three basic features of our company's stainless steel. Stainless steel can be divided into martensitic steel, austenitic steel, ferritic steel, bi-phase steel and precipitation-hardened steel. 

Ferritic steel has good corrosion resistance, resistance to chloride stress corrosion, pitting and crevice corrosion resistance and good cold working performance is widely used in both inside and outside decoration, large areas such as appliances and automobiles; Austenitic stainless steel has good mechanical properties, high temperature resistant performance of low temperature resistance, no magnetic, antibacterial properties, hot and cold processing performance, corrosion resistance and welding performance, widely used in the manufacturing industry, chemical industry, chemical fiber, fertilizer, and other fields, is one of the most consumable stainless steel; Martensite stainless steel, high hardness after quenching + tempering can get different strength and endurance, widely used in the shaft, valve, leaf, fasteners, cutting tools, springs, and other fields. Double phase stainless steel and precipitation-hardened stainless steel are the improvement of general stainless steel, better performance and more stringent conditions. So it's probably going to be more and more widely used in some wastewater treatment facilities, and it's a very promising product. 

Contrast the above characteristics of the stainless steel, it is easy to see that both stainless features, due to the only choice that could satisfy the requirement of putty knife hardness and elasticity of 2 cr13 and 3 cr13, 4 cr13, etc., but these models, the mainstream putty knife manufacturer generally choose 3 cr13 as the material of the stainless steel putty knife. 

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