Welded steel tube for carrier roller and manufacturing method thereof

Abstract

The invention discloses a welded steel tube for a carrier roller and a manufacturing method thereof. The welded steel tube comprises the compositions of, by mass, 0.050%-0.150% of C, 0.05%-0.26% of Si, 0.5%-1.50% of Mn, less than or equal to 0.010% of P, less than or equal to 0.005% of S, 0.02%-0.05% of Al, 0.1%-0.5% of Cr, 0.01%-0.05% of Nb, 0.01%-0.05% of V, 0.01%-0.05% of Ti and the balance Feand unavoidable impurities, a carbon equivalent Ceq is less than or equal to 0.4%, and a cold crack sensitivity index Pcm is less than or equal to 0.2%. The technical problems that machinability and the usage requirements of the welded steel tube for the carrier roller are inconsistent in the prior art, forming precision control is insufficient and the production requirements of the carrier rollercannot be met are solved. The technical effects that chemical elements of reasonable proportions are used, excellent cold-forming property and welding properties are achieved, the cracking of base metal or weld joints in pipe making is avoided effectively, and through reasonable hot rolling process design, the finished steel coil of hot rolling strip used for produced carrier rollers has a good shape and surface quality, good formability and abrasion resistance to adapt to the processing requirements of welded steel tubes used for the carrier rollers and meet the requirements for the use of welded steel tubes for the carrier rollers.

Description

technical field

[0001] The invention relates to the technical field of welded steel pipes for idlers, in particular to a welded steel pipe for idlers and a manufacturing method thereof. Background technique

[0002] The idler roller is an important part of the belt conveyor. The function of the idler roller is to support the conveyor belt, reduce the running resistance of the conveyor belt, and keep the sag of the conveyor belt within a certain limit to ensure the smooth operation of the conveyor belt. The idlers account for about 30% to 40% of the weight of the whole machine, and bear more than 70% of the resistance. There are many types and large quantities. The service life of the idlers directly affects the normal operation of the conveyor. With the increase of block size, transportation volume and transportation distance of modern coal transportation, and at the same time in a high-sulfur environment, in the actual use process, the idler roller is often worn by the conv...

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