论文部分内容阅读
为了解决高镍铬钼合金硬面球芯复合铸铁轧辊发生的严重铸造缺陷,本文概述了采用冲洗法生产外层为高镍铬钼合金铸铁,中心为高硅球铁冲洗的材质和工艺特点。生产实践中,在外层合金铁控制较低的碳含量,加入适量的镁以提高硅含量;同时改进浇注工艺,以增加外层合金铁的初期凝固层厚度的方法。这种生产方法,有效地克服了轧辊的热裂、发裂、气孔的产生,并彻底解决了白口层不足的问题;铸造合格率达到91％以上,轧辊的表面硬度为HS75～85。热精轧厚度2.5～8mm钢板(其中薄板占2/3,合金钢占1/3～1/2),辊耗为2～3kg/t。文章对取得的效果进行了理论分析。
In order to solve the serious casting defect of the high nickel-chromium-molybdenum alloy hard-surfaced composite cast iron roll, this paper summarizes the material and process characteristics of the high-nickel-chromium-molybdenum alloy cast iron by the flushing method. Production practice, the outer layer of alloy iron control lower carbon content, adding an appropriate amount of magnesium to increase the silicon content; while improving the casting process to increase the thickness of the outer layer of the initial alloyed iron method. The production method effectively overcomes the thermal cracking, cracking and porosity of the roll, and completely solves the problem of insufficient white stratum. The casting pass rate reaches above 91% and the surface hardness of the roll is HS75 to 85. Hot finishing thickness of 2.5 ~ 8mm steel (which accounted for 2/3 sheet, alloy steel accounted for 1/3 ~ 1/2), roller consumption of 2 ~ 3kg / t. The article made a theoretical analysis of the effect achieved.