CAUSE AND CONTROL OF BLOWHOLES AT THE ARC STARTING END OF H13 STEEL ELECTRIC SLAG INGOT
H13 mold steel is one of the most widely used materials in hot work mold steel.China is currently in a stage of rapid development of mold steel products,and there is a significant gap in product performance compared to international advanced enterprises.Improving product quality,reducing production costs,and enhancing competitiveness are the top priorities for the development of mold steel enterprises.After comple-ting the construction of the special material production line,Zhang Xuan Technology focused on H13 mold steel as its main research product.However,during the research and development process,there were blow-holes inside the arc starting end of the electric slag ingot,with a diameter of 6～20 mm and a large number and uneven distribution,which could not meet the preparation requirements of the next process for the billet steel ingot.It could only be used by cutting off the blowholes at the arc starting end of the electric slag ingot,resulting in high cutting loss,low yield,and high cost of the electric slag ingot.To this end,Zhang Xuan Technology analyzed the causes of blowhole at the arc starting end of H13 mold steel electric slag ingots,conducted screening tests on raw materials,equipment,and production preparation processes.Identified the key causes of blowhole is the high content of hydrogen.Propos measures such as slag baking,electrode ingot preparation,equipment and facility drying,optimization of arc starting slag process and slag system.Through continuous experimentation and production process optimization,the internal blowhole defects at the arc starting end of H13 mold steel electric slag ingots have been completely eliminated,resulting in a significant improvement in the quality of electric slag ingots and a nearly 10％increase in the yield of electric slag ingots.
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