A Control Method for Eliminating Vibration Mark Defects of Billet Cold Heading Steel

Abstract

The present invention relates to the technical field of cold heading steel production, in particular to a control method for eliminating the vibration mark defect of billet cold heading steel, which specifically includes: 1) the quaternary alkalinity R of mold mold slag is 0.99 to 1.30, and R={w (CaO)+w(MgO)} / {w(S i o 2 )+w(Al 2 o 3 )}; 2) Mold slag melting temperature Tm and the lowest liquidus temperature T in cast steel grades 1 meet T 1 -430≤Tm≤T 1 -400; 3) Mold flux viscosity η and casting speed v satisfy η=0.2 / v+0.02; 4) Mold vibration frequency f and casting speed v satisfy the relationship f=78v+4.4; the present invention does not change the original continuous casting process Under the premise of the parameters, select the physical and chemical parameters of mold slag reasonably and accurately, and set the sinusoidal vibration parameters of the mold reasonably and accurately. Effectively improve the lubrication effect of mold slag, avoid sticking, increase heat transfer to ensure casting speed; accelerate the formation of slag, increase the thickness of slag film to increase the inflow of slag at the meniscus of the mold, thereby improving the billet shell Lubrication between the mold copper plate and improve the quality of the final product.

Description

technical field [0001] The invention relates to the technical field of cold heading steel production, in particular to a control method for eliminating vibration mark defects of billet cold heading steel. Background technique [0002] Cold heading steel is often used to manufacture spare parts for cold pier forming and fasteners such as bolts and screws. In recent years, with the development of the machining industry, the market has become more and more strict on the performance and reliability of supporting fasteners. The quality of cold heading steel also puts forward stricter requirements. Due to the small size of the cross-section of the billet mold, the heat dissipation of the mold is relatively fast, so the control of the amount of carbon content in the mold powder for controlling lubrication and heat transfer is relatively high. High-viscosity mold slag controls billet vibration marks, but too high carbon content and viscosity will lead to insufficient mold slag supp...

AI Technical Summary

Problems solved by technology

Due to the small size of the cross-section of the billet mold, the heat dissipation of the mold is relatively fast, so the control of the amount of carbon content in the mold powder for controlling lubrication and heat transfer is relatively high. High-viscosity mold slag controls billet vibration marks, but too high carbon content and viscosity will lead to insufficient mold slag supply, resulting in poor lubrication, and in severe cases, hook-shaped vibration marks will appear, resulting in a high rate of crack defects in the wire rod rolling process. High, great impact on variety quality