Alloy steel support roll of rolling mill and manufacturing process thereof

Abstract

The invention discloses an alloy steel support roll of a rolling mill and a manufacturing process thereof. The alloy steel in the alloy steel support roll of a rolling mill comprises the metal elements such as silicon, manganese, chromium, molybdenum, nickel, vanadium, niobium and the like; the carbon content is 0.45-0.55%; and the contents of sulphur and phosphorous are both less than or equal to 0.025%. The manufacturing method comprises a smelting process, a forging process and a heat treatment process, wherein the heat treatment process comprises an after-forging heat treatment process, a preparation heat treatment process, a quenching heat treatment process and a final annealing process. A power-frequency electromagnetic induction heating device and a water spraying device are adopted in the quenching heat treatment process. Through the improvement of the material, namely the heat treatment process, the continuous rolling time of the support roll can be prolonged by over 2 hours; the surface hardness, quenching depth, surface wear-resisting property and the capability resisting accidents such as fracture and the like are obviously improved; the comprehensive performance is obviously improved; the wear of the support roll is reduced; and the roll exchange frequency is obviously reduced.

Description

technical field [0001] The invention relates to a support roll used in metal cold rolling and / or hot rolling equipment, in particular to an alloy steel support roll of a rolling mill and a manufacturing process thereof. Background technique [0002] Prior Art In the metal cold rolling production process, the back-up roll is the main support structure of the rolling mill. Due to the material problems of the back-up roll itself and the harsh working environment, the back-up roll often fails or even is scrapped. Such as: excessive wear, cracks or even breakage of the support roller. But to sum up, there are only three issues: one is the level of wear resistance, the other is the depth of the effective hardened layer, and the third is the size of the crack resistance (including resistance to spalling). Therefore, in order to improve the service life of the cold support roll, firstly, the support roll must have a suitable material with high wear resistance; The roll surface mus...

AI Technical Summary

Problems solved by technology

But to sum up, there are only three issues: one is the level of wear resistance, the other is the depth of the effective hardened layer, and the third is the size of the crack resistance (including resistance to peeling)

However, it is difficult to meet the above requirements with the support rollers manufactured by the prior art

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