Argon gas flow can't accurately adjust crack problems, are wrapped nitrogen increased by 2000 thousand times than concentration down to 800 thousand times than concentration, GaiPanLv slab edge crack by 0.87% to 0.32%
Recently, the hebei iron and steel group, hangang three steelmaking slab workshop worker HanYongJian successful transformation ladle argon protection gating system, breaking the argon gas flow can't accurate adjustment problem, wrapped nitrogen increased from the original 2000 thousand times than concentration decreased to 800 thousand times than concentration, GaiPanLv slab edge crack from 0.87% down to 0.32%.
From the molten steel ladle into the bag in, the long shuikou blow by argon protection pouring. In the wind argon protection in the process of casting, if blow argon the effect not beautiful, will not only second oxidation molten steel, and will air inhaled the numerous nitrogen to the molten steel, the molten steel nitrogen content increased will make slab edge crack rate increase exponentially, produce quality loss.
Previously, long runner gating system through the spherical valve protection argon gas quantity control, adjust the accuracy and stability is poor. Therefore, the factory workshop worker HanYongJian slab and the workers pouring system protection in repeatedly observe argon gas pipeline hard tube connection, hose connection, valve layout and installation, decided to use after the transformation of waste on hand needle type valve replacement enumerates spherical valve, adjust the argon gas flow.
Eventually, they through the many times to transform welding, overcome the spherical valve pipe size and needle type valve caliber can't directly connected and needle type valve mixes up and back to the gas problem, successful replaced the spherical valve, realize the precise regulating protection gating system argon.
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