In recent years, JGJT special steel has adopted a new process and successfully developed non-magnetic steel for special transformers. The original non-magnetic steel production process has reached the domestic leading level.
High manganese non-magnetic steel has the advantages of stainless steel resistance to low temperature impact, low magnetic non-magnetic, and carbon steel with excellent mechanical properties and easy welding. It is widely used in the manufacture of key equipment for large transformers. With the continuous development of China's power transmission and transformation industry, the demand for non-magnetic steel is increasing day by day, and it has become the object of competition between major domestic and foreign steel companies. However, the content of manganese in non-magnetic steel is as high as 25% and the content of aluminum is as high as 2%, which is 20 times and 200 times that of conventional steel grades respectively. The smelting safety risk is high and the quality control is difficult. The conventional production process cannot guarantee stable production requirements.
Despite the difficulty of smelting, in order to enhance product competitiveness, JGJT will focus on non-magnetic steel. In 2017, non-magnetic steel development projects began to be planned, and industrial production started in 2018.
They found in the research process that electric furnace production is "static" smelting, the alloy "cannot move" in the furnace, and the uniformity of the molten steel is not good; the use of a new non-electric furnace smelting process can ensure that various alloys are "mixed" under the action of power To be more even. More importantly, the smelting time is greatly shortened under the new process, and the yield of the alloy can reach up to 95%.
Under the guidance of the new process, the research and development personnel spent three years, mastered the key technology of smelting high manganese and high aluminum non-magnetic steel, successfully developed special non-magnetic steel for special transformer, and became the third non-magnetic steel continuous casting and rolling production Mass supply enterprise.
"The successful development of 20Mn23AlV, a high-manganese and high-aluminum non-magnetic steel, is just a" knocking brick "for JGJT to enter the field of manganese steel. JGJT has made breakthroughs in the development of LNG high-manganese steel and other steel types based on non-magnetic steel.