| Ti-Mo-Ni alloy is a near-alpha corrosion-resistant titanium alloy.Its nominal composition is Ti-0.3Mo-0.8Ni.It has excellent corrosion resistance,process plasticity and weldability.It is mainly used in chemical industry,seawater desalination,petroleum exploitation and other fields.In this paper,a 2400 kW electron beam cooled bed furnace of an enterprise ingot smelting branch was used as example.Taking the 736 mm titanium-molybdenum-nickel alloy ingot as the research object,eight kinds of electrode preparation schemes were designed according to the quality requirements of titanium-molybdenum-nickel ingot and tube.The production of titanium-molybdenum-nickel ingot by electron beam cooled bed furnace was carried out,and the 38*1.2 mm tube was processed.On this basis,the volatilization loss rate of each element,chemical composition uniformity and surface quality of the ingot during smelting process were studied and analyzed,and the quality of the tube produced by Ti-Mo-Ni ingot was tracked,verified and compared.The main results are as follows:(1)Ti-Mo-Ni ingot produced by single electron beam Cold-bed furnace melting has low impurity content,uniform chemical composition in both longitudinal and transverse directions and good surface quality,which meets the requirements of GB/T3620.1-2007 standard.It is processed into pipes with the specification of 38*1.2 mm,and the product quality meets the requirements of GB/T 3625-2007 standard.(2)When the melting power is controlled from 1200 kW to 1600 k W and the vacuum is not more than 0.133 Pa,the volatilization loss rate of metals is 1.5-2.5%.Titanium is the main volatilization loss,while nickel has very little volatilization loss,and molybdenum,iron,oxygen,nitrogen and carbon are almost not lost.(3)The analysis of homogeneity of chemical composition,loss rate of metal volatilization,surface quality of ingot and subsequent product quality shows that the key technological parameters adopted in this production test,such as smelting vacuum,smelting power,smelting speed and electron beam scanning pattern,match reasonably and can meet the needs of Ti-Mo-Ni ingot production.(4)From the analysis of homogeneity of chemical composition of Ti-Mo-Ni ingot and stability of pipe material,the results show that eight kinds of electrode preparation processes can meet the production requirements of Ti-Mo-Ni ingot uniformly,and the product quality is equivalent to that of two vacuum consumable arc furnace smelting.However,from the comparative analysis of production cost of ingot and tube,adding70% returned burden can reduce the cost by more than 50%,27% and 16% respectively compared with the traditional process,which is more in line with the needs of industrialized low-cost production.This subject is closely related to the actual production,which provides practical guidance for the industrialized production of low-cost Ti-Mo-Ni ingots,and also finds a breakthrough point for high-quality and efficient recovery of pure Ti and Ti-Mo-Ni residues in enterprises.On the premise of guaranteeing the quality of products,the production cost can be reduced and the recycling of titanium resources can be realized. |
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