Supporting roller with roughness keeping capability and manufacturing method thereof

Abstract

The invention discloses a supporting roller with a roughness keeping capability, comprising the following chemical components in mass percentage: 0.40-0.70% of C, 0.40-0.80% of Si, 0.50-0.80% of Mn, 4.5-5.5% of Cr, 0.40-1.00% of Mo, 0.30-0.50% of V, 0.40-0.60% of Ni. The supporting roller further comprises one or two of 0.05-0.30% of Nb and 0.05-0.30% of Ti, and residual amounts of Fe and unavoidable impurities. The invention further discloses a manufacturing method of the supporting roller; and the roughness keeping capability of the manufactured supporting roller is greatly improved.

Description

Technical field [0001] The invention relates to the field of metallurgical roll manufacturing, in particular to a backing roll used in a cold strip rolling mill and a manufacturing method thereof. Background technique [0002] Large-scale plate and strip rolling mills are the key process equipment of modern metallurgical enterprises, and backup rolls are the key core components of rolling mills, used to support work rolls or intermediate rolls and enhance their rigidity. The performance of the back-up roll directly determines the stability of the rolling mill, the forward movement of the production line, production consumption and product quality. [0003] At present, the high-grade back-up rolls of the cold rolling production lines of major steel mills mainly use 5% Cr forged steel series, with C content between 0.4 and 0.6 wt.%, Cr content between 2.0 and 5.0 wt.%, and a small amount of Alloying elements such as Mo and V. The 5% Cr forged steel backing roll can meet the product...

AI Technical Summary

Problems solved by technology

5% Cr forged steel backup rolls can meet the production needs of ordinary plates, but when matching high wear-resistant work rolls (or intermediate rolls) to produce high-surface quality plates such as automotive outer panels and home appliance panels, it exposes the problem of rapid roughness attenuation. Problem, when the roughness Ra value decays to less than 0.1μm (for a unit on site), it will cause slippage between the back-up roll and the work roll (or intermediate roll), forcing the machine to stop and replace the back-up roll in advance

However, this solution does not fundamentally solve the problem of rapid attenuation of roll surface roughness during the rolling process, and controlling the number of roll-changing rolling kilometers will reduce production efficiency and increase production costs when producing high value-added products

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