Large forged high-speed steel cold roll and manufacturing method thereof

Abstract

The invention discloses a large forged high-speed steel cold roll and a manufacturing method thereof. The cold roll comprises the following chemical constituents in percentage by mass: 0.90-1.20% of C, 0.20-1.20% of Si, 0.20-1.00% of Mn, 6.00-12.00% of Cr, 2.00-5.00% of Mo, 1.00-4.00% of V, 0.80-2.00% of W, not greater than 0.80% of Ni, not greater than 0.02% of P, not greater than 0.02% of S, and the balance of Fe and inevitable impurities. The manufacturing method for the cold roll comprises the process steps of steel ingot refining, billet forging, pre-heat treatment, machining, final heat treatment and the like. The surface layer hardness of a roll body of the cold roll manufactured by the manufacturing method disclosed by the invention is 88-98 HSD; the cold roll is excellent in wear resistance, high in roughness holding capacity and high in structure stability. According to the manufacturing process disclosed by the invention, chroming process steps are reduced and production cost is decreased.

Description

technical field [0001] The invention relates to a cold rolling roll and a manufacturing method thereof, in particular to a forged high-speed steel cold rolling roll and a manufacturing method thereof. Background technique [0002] As an important tool in the steel rolling industry, the roll is the most important consumable part of the steel rolling equipment. A cold roll is a working part that processes metal into shape by extrusion in a cold state. The cold rolls have to bear a lot of rolling stress during the working process. In addition to the welding seams, inclusions, edge cracks and other problems of the rolled pieces, the working conditions are harsh, which is easy to cause instantaneous high temperature, so that the cold rolls are subjected to strong thermal shocks and are easy to Cause cracks, sticking rolls, peeling and even scrapping. Because the cold roll is subjected to great stress during the working process, the surface of the cold roll often suffers from pe...

AI Technical Summary

Problems solved by technology

However, when the above-mentioned chromium steel series cold rolls are rolling thin plates or silicon steel sheets, slippage often occurs between the work rolls and the rolled material during the rolling process; shortly after the work rolls are used, the surface roughness of many work rolls sharply Reduced, directly affects the surface quality of the rolled plate and product qualification rate

These conditions are caused by the poor wear resistance of the work rolls and poor surface roughness retention

Due to the limitation of the material itself, conventional high-carbon chromium steel cold rolls are difficult to have good anti-accident ability while having high wear resistance. environment, the limitations of conventional high-carbon chromium steel cold roll materials are also highlighted

At present, these problems are generally solved by frequent replacement of work rolls or texturization and chrome plating of work rolls, but these methods will not only reduce the operating rate of cold rolling mills and affect the production schedule; moreover, texturization and chrome plating of work rolls are expensive and increase production. cost, but also cause environmental pollution

However, the raw material cost, production cost and production difficulty of forged high-speed steel cold rolls are significantly higher than those of cast high-speed steel cold rolls.

Therefore, forged high-speed steel has limited use in the production of cold rolls, and can only be used to manufacture small cold rolls