Precise surfacing welding method of high-hardness cold and hot rolls

Abstract

The invention relates to a precise surfacing welding method of high-hardness cold and hot rolls. The precise surfacing welding method comprises the following steps: (1) selecting die steel deposited metal components to prepare a surfacing alloy enabling the hardness of cold roll surfaces to be larger than 60 HRC for standby application; (2) cladding the covering surface of the alloy product after surfacing welding in the step (1) with metal components for standby application; (3) carrying out surfacing welding on the alloy product after surfacing welding in the step (2) with the preheating and interpass temperatures higher than 280 DEG C; and (4) carrying out high-temperature tempering on the alloy product after surfacing welding in the step (3), and carrying out secondary high-temperature tempering on cold-rolled working rolls with a higher demand for tenacity. The precise surfacing welding method is reasonable in conception and simple in operation procedure, the hard-face surfacing welding repairing or composite manufacturing of cold rolls and steel plate hot continuous rolling function rolls with high strength can be met, and the method is high in reliability and quality reproducibility.

Description

technical field [0001] The invention relates to the technical field of precision welding, in particular to a high-hardness cold-rolled and hot-rolled high-hardness cold-rolled and hot-rolled machine for wear-resistant parts surfacing repair and composite manufacturing represented by high-hardness cold-rolled rolls and hot-rolled functional rolls (including moulds) whose hardness requirements are ≥ 60HRC. Precision surfacing method for rolls. Background technique [0002] In modern times, there are more and more wear-resistant parts with high roller (die) surface hardness requirements. Such as: strip steel, stainless steel; aluminum, copper, titanium plate reversible rolling mill cold rolling work roll, leveling, straightening and other functional rolls; 60-100kg high-strength steel plate hot rolling coiler auxiliary roll, pinch roll and other functional rolls. Molds include cold extrusion and hot extrusion tools and molds, such as spinning dies and extrusion dies. [0003...

AI Technical Summary

Problems solved by technology

[0004] The reality is that although there is no lack of research and application reports on the surfacing materials and processes of the above-mentioned wear-resistant parts, the actual hardness of the surfacing layer is mostly in the range of <60HRC