Preparation process for steel-cast roller

Abstract

The invention discloses a preparation process for a steel-cast roller. High-alloy steel of a working layer of the roller is in fully metallurgical bonding with graphitic steel of a core part of the roller. The high-alloy steel comprises, by weight, 0.5% of C, 0.5% of Si, 0.5-0.6% of Mn, 4.5% of Cr, 1.1% of Ni, 0.7% of Mo, 0.04% of Re, less than or equal to 0.03% of P, less than or equal to 0.03% of S, and the balance Fe; the graphitic steel comprises, by weight, 1.5% of C, 1.8% of Si, 0.5% of Mn, 0.6% of Ni, less than 0.2% of Cr, less than 0.3% of Mo, less than 0.03% of P, less than 0.03% of S, and the balance Fe. By means of the preparation process for the steel-cast supporting roller, the obtained roller has the advantages that the abrasion resistance and the toughness of the working layer of the roller are good, the anti-accident ability is high, the service life is long, and accordingly the manufacturing cost of the roller is reduced.

Description

technical field [0001] The invention relates to a steel casting roll configuration process. Background technique [0002] The quality of the roll not only affects the surface quality of the rolled material, but also affects the operating rate of the rolling mill, which directly restricts the economic benefits of the enterprise. In the existing production technology, the back-up rolls used in these rolling mills usually adopt integrally cast alloy semi-steel rolls, as well as partial alloy cast steel rolls, forged steel rolls and composite semi-steel rolls. Common problems in the use of back-up rolls are destructive damage such as cracks on the roll surface, peeling, and shoulder drop. According to statistics, the consumption of such abnormal damage accounts for more than 40% of the consumption of the entire back-up roll every year. The economic benefits have a great impact. The main reason for these problems is that due to the low alloy content, coarse matrix structure, lo...

AI Technical Summary

Problems solved by technology

Common problems in the use of back-up rolls are destructive damage such as cracks on the roll surface, peeling, and shoulder drop. According to statistics, the consumption of such abnormal damage accounts for more than 40% of the consumption of the entire back-up roll every year. have a great impact on the economic benefits of

The main reason for these problems is that due to the low alloy content, coarse matrix structure, low contact fatigue resistance and poor toughness of the existing back-up roll materials, they are subject to the repeated alternating of the strong rolling pressure of the rolling mill and the reverse bending force of the work roll during use. Under the action, the fatigue stress and shear stress on the roll surface exceed the strength limit of the material, resulting in destructive damage such as cracks, peeling and shoulder drop

Although the patent application: "a high-alloy centrifugal composite cast steel support roll and its manufacturing method" described in 200910001054.9 is feasible in the selection of the material of the roll working layer, the disadvantage of the technology of the invention is that the roll core is The internal tensile strength is low, and the roll is prone to breakage during use; on the other hand, the finished product rate of the inventive technology is low during the implementation process, thereby increasing the manufacturing cost of the roll and reducing the market competitiveness of the product