Steel strength limit with increase with thecontent of manganese, every 1% increase in the manganese content, ultimatestrength improve 98066.5 kPa, and at the same time, steel plastic limit alsocorresponding improvement. When the steel manganese content is morethan 10%, the steel of corrosion resistance increases greatly in theatmosphere, manganese can also reduce the oxygen and sulfur on the harm ofsteel, so as to improve steel Wholesale corrugated steel sheet malleability and rolling resistance. Although manganese element was found in1774, but, in the iron and steel industry manganese play an important roleuntil 1856 invention of bottom blowing Bessemer converter, and 1864 inventionopen hearth furnace process after, to be recognized. Now manganese is animportant raw material become indispensable to the iron and steel industry.
Steelmaking process, in order to improvethe quality of steel, need to get rid of the molten iron carbon, sulfur andother harmful impurity, the most simple process is to use oxidation method, butsome iron and impurity element with oxidation to produce ferrous oxide (FeO),while FeO in solubility in liquid steel, so that in liquid steel increasedoxygen, can achieve 0.25% ~ 0.45%. Oxygen content increased, the performance ofthe steel adverse effects, so steel to oxygen levels have strict requirements,generally no more than 0.02%, and even more strict. Therefore, steelmakingprocess must take off exceeds the oxygen. Manganese is active good metalpowder, the chemical performance is lively than iron, manganese willjoin steel liquid when can and FeO reaction formation insoluble in molten steelof oxide slag, floating YuGangShui level, reducing oxygen in steel. Compared with other elements (such ascalcium, aluminum, silicon), the ability of deoxidization of manganese in themolten steel is low, but because of its easy to production, the price is low,so still deeply iron and steel enterprise’s welcome, especially for refinedrimming steel speaking, using ferromanganese alloy deoxidizing is idealdeoxidizer, for manganese of deoxidizing ability is weak, it can adjust thesteel oxygen content, and unapt make oxygen off too much and not boiling. Atthe same time the existence of manganese can also make the ability of siliconand aluminums deoxidization strengthens, because MnO of deoxidizing productswith other oxide (such as Si02) can form low melting point compound and benefitfrom the liquid steel out. Sulfur exist in iron statistics (FeS) insteel liquid, steel containing sulfur high easy to produce heat brittle, reducethe mechanical properties of the steel, therefore, steelmaking process mustcontrol the content of sulfur.
Manganese and sulfur binding force greater thaniron and sulfur binding force. When adding manganese alloy after the steel [FeS] is very easy and manganese generation high meltingpoint [MnS] and turn people slag, so as to reduce the sulfur content in thesteel. Manganese can strengthen the ferrite andrefining pearlite, thereby enhancing the strength of steel, still can improvesteel hardenability, steel hardness and wear resistance. Therefore, manganese powder is animportant alloy elements. Ordinary carbon structural steel generallycontain Mn0.25 % ~ 0.8%; High quality carbon structural steel generally containMn0.7 % ~ 1.2%; In low alloy steel adding 0.8% ~ 1.7% of Mn can make thestrength of the steel than the ordinary carbon steel is increased by 20% ~ 30%;Spring steel including Mn0.4 % ~ 1.3%; Bearing steel including Mn0.3 % ~ 1.6%;Tool steel including Mn0.4 % ~ 2%; Wear resistant steel including Mn11 % ~ 15%;Heat resistant steel including Mn17 % ~ 21%; Electrical steel including Mn17 %to 19%.Source:
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