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.