Patent ID: 8584923

Claim:
A shear-joining method for endless hot rolling materials of high carbon steel comprising: shear-joining a pair of metal bars having a thickness, the metal bars comprising high carbon steel having, in terms of weight %, 0.30% to 1.20% C, inevitable impurities, and balance Fe, or comprising 0.15% to 1.5% C, containing at least one of Cr, Ni, Mo, V, Ti, W, B, Nb, and Sb, inevitable impurities, and balance Fe, such that a joined surface of the joined metal bars is formed to be inclined in a thickness direction of the metal bars, in a hot rolling plant by a joiner having upper and lower blades adapted to join the metal bars after overlapping a trailing end of a leading one of the metal bars and a leading end of a trailing one of the metal bars, wherein the shear-joining of the metal bars is executed under a condition in which a stroke ratio ranges from 1.55 to 1.7, wherein the stroke ratio represents a value obtained by calculating a sum of a distance moved by the upper blade of the joiner and a distance moved by the lower blade of the joiner and dividing by the thickness of the metal bars, and wherein portions of the metal bars to be joined are descaled at a pressure of 50 MPa or less.