In titanium bar exist in two shapes, one is free of carbon (graphite), primary exists in casting titanium, the other is a compound carbon (titanium carbide), primary exists in steelmaking raw titanium, titanium carbide hard and brittle, plasticity, low content of proper progress strength and hardness of the titanium bar, content is too much, makes the titanium rod difficult to cut cut processing, this is the cause of the steelmaking raw titanium cutting function is poor. Graphite is soft and low in strength, and its presence adds to the casting function of titanium rods.
During the titanium production period, the refractory materials forming the titanium mouth are corroded, the diameter of the titanium mouth increases, and the depth is shortened. When plugging the titanium orifice, the eroded part must be restored to its original state to maintain the depth of the orifice. Therefore, the key problem when plugging the titanium orifice is to increase the depth of the orifice or the length of the horizontal mud bag. In general, when the titanium hole is plugged, the amount of mud injected into the gun is much greater than the amount needed to fill the inner space of the titanium hole, which is generally twice the volume of the titanium hole. The titanium hole depth cannot be increased without the addition of excess gun-mud. If there is nothing but titanium water or slag in the titanium mouth of the furnace, the mud pumped into the hearth is heated quickly and will break into small pieces and float upwards. To increase the titanium hole depth, the incoming gun-mud must be bonded to the old mud pack around the titanium hole and stay there for a period of time to form a whole with the later mud pack. Therefore, there must be a space to hold the mud in the titanium mouth area of the furnace, so that the main part of the surface of the mud bag is covered by the dead material column, and the titanium mouth depth can be increased.
Silicon (Si) :
It can promote the carbon separation contained in the titanium rod to be graphite, can remove oxygen, can also reduce the air hole of the casting, can improve the fluidity of the molten titanium rod, reduce the shortening of the casting, but too much silicon will also make the titanium rod hard and brittle.
Manganese (Mn) :
Soluble in titanite and cementite. In the blast furnace smelting titanium, manganese content is appropriate, can improve the casting function and cutting function of titanium rod, in the blast furnace manganese and harmful impurities sulfur can form manganese sulfide, into slag.
Through the pre-set mud bag, the stable titanium mouth channel can be formed in the early period of the blast furnace, so as to maintain the depth of the titanium mouth. After the blast furnace is opened, if the ramming material is worn away by slag, coke ore layer, then even if the gun mud into more, will float off, not to increase the titanium hole depth. To make the incoming gun mud in the furnace charge to form a mushroom shaped mud bag head, able to withstand the erosion and wear of titanium water circulation, and at the same time in the next opening process to be able to drill, can ensure the production of titanium stability.
Phosphorus (P) :
Attributed to harmful elements, but phosphorus can make the fluidity of titanium water to add, this is due to sulfur to reduce the melting point of titanium, so in some products often contain higher phosphorus content. But the presence of phosphorus and titanium to add hardness and brittleness, excellent titanium should be less phosphorus, sometimes in order to add liquidity, phosphorus content up to 1.2%.
Sulfur (S) :
In titanium bar is harmful element, it promotes the contact between titanium and carbon, makes titanium hard and brittle, and with titanium to form titanium sulfide with low melting point, causes titanium to produce hot brittleness and reduces the fluidity of titanium liquid, contains sulfur high titanium rod is not suitable for casting fine parts. The sulfur content of cast titanium rod shall not exceed 0.06% at most.
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