Modified manufacturing process for high-chromium cast iron composite roll through forged steel roll neck and equipment

Abstract

The invention discloses a modified manufacturing process for a high-chromium cast iron composite roll through a forged steel roll neck and equipment. The material comprises, by mass, 3.0%-3.6% of C, 0.60%-1.20% of Si, 0.30%-1.20% of Mn, 3.0%-5.0% of Ni, 1.0%-2.0% of Cr, 0.40%-1.2% of Mo, 0.1%-2% of W, 0.5%-1.0% of Cu, 0%-0.05% of P, 0%-0.03% of S, 0.04%-0.06% of Mg, 0.1%-0.3% of Nb, 0.1%-0.30% of Ti, 0.2%-0.6% of V, 0.05%-0.2% of B, 1.5%-2.5% of Ba, 1%-2% of Ca, 1%-3% of Sb, 0.02%-0.18% of N, 1.0%-2.0% of Y/RE and the balance Fe and inevitable microelements. Yttrium-based rare earth nodulizing and compound inoculating of Ba, Ca and silicon iron are adopted, and modification treatment is conducted by adding Nb, Ti, V, B, and Sb, so that the mechanical property of the roll is improved. The strength of the roll is improved through the forged steel roll neck. Overall in-mold heating and fusion casting are conducted on a core rod through an induction heater. Forming is conducted through a water cooled crystallizer. A composite layer interface can be dynamically controlled. The process is simple, the efficiency is high, power consumption is small, the cost is low, composition segregation is avoided, and the service life of the roll is long.

Description

technical field [0001] The invention belongs to the technical field of metal pressure processing, and in particular relates to a process and equipment for an improved forged steel roll neck high-chromium cast iron composite roll, which is suitable for manufacturing composite rolls in the steel rolling industry. Background technique [0002] The roll is known as the "mother of steel". It is a tool for plastically deforming metal materials in the rolling production of steel, aluminum, copper and other metals. Rolling is an indispensable key component and the most important bulk consumption component, and its consumption cost is about 5% to 15% of the steel rolling production cost. If factors such as production downtime, reduced production and increased equipment maintenance due to roll consumption are considered, the proportion of production costs will be even higher. [0003] Rolling mill is an important equipment in metal pressure processing and production, and it is a rema...

AI Technical Summary

Problems solved by technology

Therefore, when the core material is cast steel, a good composite interface cannot be obtained.

[0012] 3) Composite rolls with forged steel cores with high strength and high toughness cannot be produced

At present, it is mainly manufactured by the centrifugal composite casting process in China. Due to the limitation of the manufacturing process, the core is made of nodular cast iron. Due to the low strength of nodular cast iron, it is easy to break the roll during steel rolling production, which seriously affects the steel rolling production and product quality.

[0023] At present, centrifugal bainite rolls are usually used in the rolling of finished bars, slitting racks, and strips. This roll has the following shortcomings in the long-term use process: 1. The hardness drop is large, and the centrifugal bainite rolls From one use to the last use, the material structure changes greatly, the hardness and wear resistance decrease rapidly, and the rolling tonnage can decrease by 50-70 tons; 2. The thermal fatigue resistance is poor, and the rolls work at high temperature for a long time. Due to the thermal fatigue resistance of the roll, after a period of use, the roll is prone to cracks and surface blocks, which seriously affects the quality of the rolled piece; 3. The centrifugal bainite roll has low toughness and high brittleness, and roll breakage occurs from time to time

However, it is still a brittle material. Under the service conditions of high impact, failure phenomena such as fragmentation and fracture often occur, which is manifested by insufficient toughness, which limits its application.

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