Ultrapure smelting method of low-alloy high-strength steel
A low-alloy high-strength, pure technology, applied in the field of vacuum induction melting, can solve the problem of inability to achieve ultra-pure, and achieve the effect of improving hot working performance, improving service performance, and reducing ductile-brittle transition temperature
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Embodiment 1
[0025] Use high-purity, thermodynamically stable CaO crucible to melt low-alloy high-strength steel. The melting process includes: charging → melting period → refining period → condensation → deoxidation, desulfurization period → pouring; among them, charging, melting period, pouring Using conventional techniques. The specific process is:
[0026] (1) 50kg CaO forming crucible for smelting crucible, CaO purity ≥ 98.5wt%;
[0027] (2) Alloy raw materials: According to the composition requirements, the constituent elements of steel such as industrial pure Fe, polysilicon, metal manganese and metal chromium, as well as deoxidizing and desulfurizing agents.
[0028] In this step, the deoxidizing and desulfurizing agent is a Si-Ca master alloy: Si: 25wt%, Ca 75wt%.
[0029] (3) Alloy charging: put the main raw materials Fe, Cr, and Si into the crucible, and put Mn and deoxidizing and desulfurizing agents into different compartments of the alloy feeding hopper;
[0030] (4) Alloy...
Embodiment 2
[0040] Use high-purity, thermodynamically stable CaO crucible to melt low-alloy high-strength steel. The melting process includes: charging → melting period → refining period → condensation → deoxidation, desulfurization period → pouring; among them, charging, melting period, pouring Using conventional techniques. The specific process is:
[0041] (1) 50kg CaO forming crucible for smelting crucible, CaO purity ≥ 98.5wt%;
[0042] (2) Alloy raw materials: According to the composition requirements, the constituent elements of steel such as industrial pure Fe, polysilicon, metal manganese and metal chromium, as well as deoxidizing and desulfurizing agents.
[0043] In this step, the deoxidizing and desulfurizing agents are Si-Ca master alloys: Si: 25wt%, Ca: 75wt%.
[0044] (3) Alloy charging: put the main raw materials Fe, Cr, and Si into the crucible, and put Mn and deoxidizing and desulfurizing agents into different compartments of the alloy feeding hopper;
[0045] (4) All...
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