Semi high speed steel cold-rolling intermediate roll and manufacturing method thereof

Abstract

The invention discloses a semi high speed steel cold-rolling intermediate roll and a manufacturing method thereof. The semi high speed steel cold-rolling intermediate roll comprises the following chemical components in percentage by weight: 0.50 to 0.90 percent of C, 0.5 to 2.00 percent of Si, 0.20 to 1.00 percent of Mn, 4.50 to 6.00 percent of Cr, 0.50 to 2.00 percent of Mo, 0.20 to 1.00 percent of V, less than or equal to 0.80 percent of Ni, less than or equal to 0.025 percent of S and less than or equal to 0.025 percent of P. The manufacturing method comprises: manufacturing a steel blank of the cold-rolling roll; roughly turning and tempering; quenching at 940 to 1,000 DEG C; and tempering at 450 to 550 DEG C for 30 to 120 hours. The surface hardness of the cold-rolling intermediate roll made of the material is 75 to 85HSD; the mechanical stress resistance, thermal stress resistance, tissue stress resistance, contact fatigue resistance, wear resistance, hot impact resistance and roll shape retaining performance of the semi high speed steel cold-rolling intermediate roll are high, and the comprehensive service performance of the semi high speed steel cold-rolling intermediate roll is high.

Description

technical field [0001] The invention relates to a cold-rolling intermediate roll for rolling cold-rolled strip steel and a manufacturing method thereof. Background technique [0002] With the development of the steel rolling industry, in order to roll high-precision cold-rolled strip steel, new continuous rolling mills or single-stand rolling mills are mainly six-high rolling mills. The six-high rolling mill includes paired intermediate rolls, work rolls, back-up rolls, etc., and the rolling contact between the opposite rolls, their contact stress is high and the load distribution is uneven, there is asymmetric wear, and due to the long machine cycle , The fatigue cycle is high, which can easily lead to serious wear and tear. [0003] In order to improve the rolling accuracy of cold-rolled strip steel and the production efficiency of the rolling mill, the development trend of the six-high rolling mill is: the rolling speed of the rolling mill is getting faster and faster, t...

AI Technical Summary

Problems solved by technology

The six-high rolling mill includes paired intermediate rolls, work rolls, back-up rolls, etc., and the rolling contact between the opposite rolls, their contact stress is high and the load distribution is uneven, there is asymmetric wear, and due to the long machine cycle , high fatigue cycle, easy to cause serious wear

[0003] In order to improve the rolling accuracy of cold-rolled strip steel and the production efficiency of the rolling mill, the development trend of the six-high rolling mill is: the rolling speed of the rolling mill is getting faster and faster, the thickness of the strip rolled by the rolling mill is getting thinner, and the deformation resistance of the rolled material is getting higher and higher. Large, which leads to rolling accidents such as slipping, hot cracking, broken strips, and steel sticking in conventional products during use

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