High-tenacity wear-resisting overlaying alloy welding wire for cold-rolling support roller

Abstract

The invention relates to a high-tenacity wear-resisting overlaying alloy welding wire for a cold-rolling support roller, and the overlaying alloy welding wire provided by the invention has excellent tenacity and suitable hardness. The alloy welding wire comprises the following chemical components by weight percent: 0.2-0.4% of C, 1.0-2.0% of Mn, 0.5-1.5% of Si, 3.0-6.0% of Cr, 0.5-2.0% of Mo, 1.0-3.0% of Ni, less than or equal to 0.02% of P, less than or equal to 0.01% of S, and impurities, wherein the impurities comprise mineral substances and alloy powder; the mineral substances, the content of which is 2-5%, comprises one or more than one of CaF2, CaCO3, Na3SiF6 and LiF2; the alloy powder, the total content of which is 0.3-2.0%, comprises one or more than one of vanadium, tungsten, niobium, titanium, aluminum, and the like; and 0.1-0.5% of rare earth is additionally added. The welding wire is matched with a suitable welding process, thereby acquiring the hardness of HRC (Rockwell hardness) 48-53. A low-carbon steel belt is used for wrapping the alloy powder and the mineral substances and then rolling and drawing are performed, thereby forming the welding wire. A reasonable component design is matched with HJ107, grains are refined and sulfur-removing components are added, so that the high-tenacity wear-resisting overlaying alloy welding wire is free from hot crack in an overlaying process, has the hardness and tenacity suitable for cold-rolling rollers, and meets the demand of overlaying a cold roller.

Description

technical field [0001] The invention relates to an alloy welding wire, in particular to an alloy welding wire with high toughness and high wear resistance for overlay welding of cold-rolled support rolls. Background technique [0002] The cold roll back-up roll will bear huge positive pressure and shear force when it is working, which will easily cause the roll surface to fall off in pieces. The smaller the deformation of the back-up roll during rolling, the better, which requires the hardness of the surfacing layer metal to be at least above HRC48. It is relatively easy to obtain a metal with a hardness of HRC48, but its toughness is difficult to guarantee, and the early initiation and expansion of fatigue cracks will not be avoided, resulting in roll damage. [0003] There is an urgent need to develop a surfacing alloy that has both suitable hardness to meet cold rolling industrial and mining, and sufficient toughness to delay the initiation and expansion of cracks. This...

AI Technical Summary

Problems solved by technology

It is relatively easy to obtain a metal with a hardness of HRC48, but its toughness is difficult to guarantee, and it will be impossible to avoid the early initiation and propagation of fatigue cracks, resulting in roll damage

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