【文章內(nèi)容簡介】 dium in work or surface is attached to the corrosive medium of steel parts, when the surface of existing nonmetal inclusions, due to nonmetallic inclusions and steel substrate electrode parts of a different corrosion micro cell [37], will be in nonmetallic inclusions in the boundary of the steel basic and electrochemical corrosion occurred.6) inclusion of influence on the performance of the steel heat treatmentNonmetal inclusions in steel is usually heattreatment quenching cracking when the one of the main reasons. This is because inclusion in steel destroyed the continuity.7) inclusion of steel welding performance influenceNonmetallic inclusion of steel welding influence on the performance of the main product is easy to cause in the weld seam or heat affected zone crack. Steel of the nonmetallic inclusions in the studyGood quality of metal materials not only meet the technical standard chemical position of requirements, nonmetallic inclusions in the material also wants as far as possible less, because even a small amount of nonmetal inclusion also can affect the mechanical properties of the metal, reduce the material quality. These slab of the nonmetallic inclusions destroyed the continuity of the steel and dense sex, the quality of the products of metal has a very important impact. In the continuous casting slab more nonmetallic inclusions, quenching will stress concentration and cause crack, reduce fatigue strength, and even to make the work directly scrap, the existence of the inclusion, can make the parts in the corrosive medium in inclusion in place causes corrosion. Nonmetallic inclusion of metal materials quality affects not only depends on the amount of and the position of the inclusions and, appearance and distribution state relevant。 The appearance of adverse distribution, such as: the distribution of grain boundaries, chains, be rolling into strips of inclusion of mechanical properties of especially big influence. Under external force often nonmetal inclusions in existing local stress concentration, when stress is big enough to broken material. So inclusion types, content and distribution is usually think that assess the quality of steel products is one of important index, and is listed as highquality steel and high quality steel factory routine inspection programs.Continuous casting solidification speed, inclusion floatation and there too scattered, continuous casting steel and refractory slag contact, the opportunity is exposed to the air, so, mingled with plicated source, according to the research results of the past, and put forward the inclusion of source, type and reduce the inclusion of the measures. Inclusion sourceAccording to the steel smelting process, in the following each link may cause of billet inclusions produce [and] :1) the steel slag converterThe effect of the steel slag relatively poor when the steel slag ladle into the more, plus used ladle some not too clean, when many of the steel slag wrapped in the molten steel with clip, polluted the molten steel. Some furnace times blowing refining is not good, direct pouring, of deoxidizing products and a suspension of the molten steel slag can39。t fully rise, also caused the molten steel pollution [23] [3].2) ladle, middle bag that lining erosionIn the process of production of ladle lining things into erosion if molten steel, especially when the temperature in the ladle finer LF the knot of material erosion, can cause molten steel ladle lining erosion pollution. A large number of tundish stuffing (clay brick powder) and insulating board of molten steel in the pollution, and the filling of the tundish pollution extremely easily through the dipped into the molten steel nozzles into mould, by the formation of the inclusion size is also the biggest, the destruction of the performance of the steel also the most obvious. In addition, pouring later coating erosion after appearing, tundish knot into the molten steel material erosion and cause pollution.3) the molten steel secondary oxidationThe molten steel tundish by big pack to should be adopted to protect the seal, but in actual use, the upper steel flow tend to show in the air and cause the second oxidation. And in the course of oxygen and high pressure casting in the protection of the walls of the steel and the formation of oxide NingRu mould easily into the solidified shell.Finer blow argon, if only pursue rapid cooling or shorten refining time, can make the argon gas pressure is too high, make big pack liquid surface flipping too big, on the one hand, cause the water two times bare steel oxidation, on the other hand, liquid level excessive flipping make surface slag layer incorporated into the molten steel, steel pollution.4) tundish pollutionCasting process, and the upper and lower furnace connection of molten steel, usually because production organization or other reasons, the connection is bad, the molten steel in the furnace can39。t poured again, tundish liquid surface is too low, with the upper! (scroll into the mould. Tundish not clean, sundry and refractory pieces and molten steel pollution.5) mould liquid surface waveIf tundish plug open and close and adjust the great drawing speed is by artificial control, mould sometimes volatile liquid surface, and former period nozzles dipped into the side holes in the small Angle, insert depth often changes in order to change the position of the nozzle slag line, intensifies the mould the liquid surface wave, protection of steel slag was rushed to the outlet flow to arc plate edge 1/2 position gathered together, and was involved in the molten steel flow of steel, and mould surface wave is apt to cause the most under slab crescent in the green shell surface early subcutaneous wrapped slag. The classification of the nonmetallic inclusions1) inclusions points according to the sourceSteel of inclusions in accordance with the source can be divided into the endogenous