Effect of original microstructure and annealing process on spheroidizing effect of high carbon fine blanking steel SK85

doi:10.13251/j.issn.0254-6051.2021.06.008

Abstract

Abstract: Aiming at the quality requirement of controlling the spheroidization rate of high carbon fine blanking steel SK85 above 90% in the end market, the important factors affecting the spheroidization effect of SK85 were found out through test and analysis. The results show that both of the original microstructure and the spheroidizing annealing process are the important factors affecting spheroidizing effect. Adopting hot rolling by low temperature coiling can result in finer microstructure with smaller lamellar spacing before annealing, and the spheroidizing tendency is better. When the spheroidizing annealing temperature is between Ac₁-Ac₃, the carbon atoms are fully diffused, and the lamellar cementite dissolves into spherules, so the spheroidizing effect is the best. The suitable process parameters for high carbon fine blanking steel SK85 so obtained ensures on the industrial production line the spheroidization rate of over 90% and good fine blanking property, which has been already recognized by users.

Key words: SK85 steel, original microstructure, spheroidization annealing, spheroidizing rate, fine blanking property

CLC Number:

TG156.21

Liu Jianfeng, Yu Jianlin, Ge Qilu, Qiu Shengtao, Tang Xiaoyong. Effect of original microstructure and annealing process on spheroidizing effect of high carbon fine blanking steel SK85[J]. Heat Treatment of Metals, 2021, 46(6): 36-40.

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