Heat,treatment,cast,iron,Cast, business, insurance Heat treatment of cast iron
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Cast iron is theearlier used material in the history, also one of the cheapest metal materials. Suchas machine bed, headstock, tailstock, internal combustion engine cylinderblock, cylinder liner, piston rings and camshafts, crankshafts are made of cast iron, in agricultural machinery,automobiles, machine tools and other industries, the cast iron is total accountfor 40%-90%. The same as steel, cast iron is mainly used the Fe, C elements as iron-basedmaterial, but has a high carbon content (more than 2.11%), also containing moresulfur, phosphorus and other impurity elements. According to metal powder supplier, in order to further improve the mechanical properties or specialproperties of cast iron, also can be add chromium, molybdenum, vanadium, copper,aluminum and other alloying elements, or improve the content of silicomanganesephosphorus and other elements, this cast iron is referred to as alloy cast iron.Common alloy cast iron has cast iron, heat-resistant cast iron,corrosion-resistant cast iron.Thecast iron that hard to be wear is called wear-resistant cast iron, general canbe formed certain amount of hardening phase to improve the wear-resistance byadding some alloying elements in cast iron. According to their workingconditions, wear resistant cast iron can be divided into antifriction cast ironand wear-resistant cast iron two categories.Antifrictioncast iron is refered to as the wear-resistant cast iron work in the lubricationconditions. Although the ordinary gray cast iron has good wear-resistance, butfor Machine tool, engine cylinder liners and piston rings and other parts, thisis still far failed to meet the requirements. The way to increase antifrictioncast iron is mainly through alloying and inoculation, common alloying elements hasCu, Mo, rare earth, Mn, Si, P, Cr, Ti, etc. , the common used inoculant isferrosilicon. Common antifriction cast iron has phosphorus-containing castiron, vanadium and titanium cast iron, boron cast iron three types and other antifrictioncast iron developed on the basis of them. Most of these cast iron were byimproving the organization of the cast iron to improve the wear resistance ofthe cast iron.The wear-resistanceof antifriction cast iron is closed to the substrate organization. Its organizationis generally distributed hard particles in a soft matrix, theoretically, thehigher the hardness of the matrix, the better the abrasion resistance, but highhardness of the substrate is not conducive to the film formation of graphite.In cast iron, the pearlite is an ideal organization. Wherein the ferrite is thesoft substrate, cementite is hard particle, while the flake graphite has lubricationrole, in order to further improve the wear resistance of pearlitic gray castiron, can increase the mass fraction of phosphorus element to 0.4%-0.7%, formedof high phosphorus cast iron. The morphology of pearlite is better the flake. Ingranular pearlite, carbide is easy to fall off to form of abrasive, so that itswear resistance is worse than pearlite, generally do not want this kind oforganization.Boron isa rich alloying element in China,the total storage is accounted for fifth in the world. Boron is a special element,atomic number is five, between metal and nonmetal, both can combine with the metaland the non-metallic. Adding a small amount of boron powder (0.01 to 0.1%) in cast iron can effectively improve the hardness ofthe cast iron, corrosion and wear resistance, therefore, the emergence of boroncast iron also caused great importance around the world, particularlyindustrial countries. Cast iron boron as antifriction material put intoindustrial, only have 50 years history. The application of boron cast iron in Chinais late, started to develop in the early 1970s, and applied to cars andtractors cylinder liner and piston rings, get good results.Source:http://www.mhcmp.com
Heat,treatment,cast,iron,Cast,