316L stainless steel pipe if it contains impurities, not only its surface quality, the impact of its performance is immeasurable. And if want to reduce the 316L stainless steel pipe impurities, improve its purity, it is necessary to start from the production process. The following is to improve the purity of 316L stainless steel pipe method.
1, To avoid impurities into the steel.
a. Manufacturers in the procurement of raw materials (scrap, ferroalloy, etc.), slagging information (lime, fluorite, etc.), deoxidized data quality and baking, boring;
b. Stainless steel pipe manufacturers of steel-making workshop lining, ladle and pouring system with the quality of refractory materials and baking;
c. Progressive steelmaking gas (argon, oxygen, nitrogen, etc.) purity (can not have water, etc.);
d. Avoid secondary oxidation of molten steel during tapping and pouring.
2, Removed from the steel. Manufacturers in the production of the method is selected AOD, VOD and other furnace outside the fine; for those who have special requirements, but also for electroslag remelting vacuum arc furnace. VOD and three-step essence than the AOD essence, steel oxygen, nitrogen, carbon can reach a lower level, which is particularly important for ferritic stainless steel tube; electric furnace steel C, S, N is much higher than the AOD furnace Essential steel, AOD essence after the carbon content of ≤ 0.02%. Some studies have shown that the EAF and then by the electroslag remelting of the 18-8 type chrome nickel stainless steel pipe, the pitting corrosion resistance is better than the electric single steel. In non-ferrous metals harmful impurities, many elements of low melting point, high vapor pressure, so it is easy to evaporate at high temperatures. In the AOD, VOD essence of the process, because the high temperature of the carbon and oxygen reaction and through the argon, oxygen and other gas mixing, are conducive to accelerate the evaporation of these harmful impurities removed. VOD essence in this regard is even more favorable. Comparison of the content of non - metallic inclusions in the stainless steel tube after the essence, the comparison between the EAF and the AOD essence steel. Found that AOD essence of steel in the non-metallic inclusions much lower than the electric furnace steel. In the electric furnace steel and AOD secondary fine steel grinding rate comparison, obviously AOD fine steel grinding rate is lower than the electric furnace steel.
