Application of high casting speed process under heavy reduction of No.65 high carbon steel billet
The core difficulty in achieving high casting speed in the production of high carbon hard wire steel is the internal quality control of casting billet.The heavy pressing technology of billet is a new technology that can im-prove the internal quality of hard wire steel produced by billet.In order to study the effect of heavy reduction for high carbon steel billet in the high casting speed production process,Guangxi Iron and Steel Group Co.,Ltd.con-ducted single roll heavy reduction study on No.65 hard wire steel with 165 mm× 165 mm cross-section billet.The research results based on a large number of engineering practices and model calculations indicate that the effective re-duction range under single roll heavy reduction is between 0.40 and 0.79 for the center solid phase fraction.In the appropriate reduction range,single roll heavy reduction can simultaneously improve center porosity,center shrink-age,and center segregation.Single roll heavy reduction at position with central solid phase fraction less than 0.30 can lead to cracking and negative segregation during reduction,and the improvement effect on shrinkage is also poor.Moreover,after solidification,no ideal effect of"welding"shrinkage is found with single roll reduction of 15 mm.Within the effective reduction range,single roll heavy reduction is carried out,as the reduction amount in-creasing,the improvement of center segregation and shrinkage of billet becomes more obvious,but the reduction amount is limited by equipment capacity.Through model guidance and production practice,ultimately achieving sta-ble production of high carbon hard wire steel with a cross-sectional area of 165 mm× 165 mm at least 2.5 m/min.
billethigh casting speedhard wire steelsegregationsingle roll heavy reduction
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