| 摘要 |
PURPOSE:To obtain a traveler, having excellent high-temperature softening resistance and capable of sufficiently withstanding frictional heat with a ring, by subjecting an alloy steel wire consisting of a specific composition to quenching, then soft nitriding or nitriding treatment and forming a compound and diffusion layers from the outermost surface. CONSTITUTION:The aimed traveler obtained by forming an alloy steel wire consisting of 0.6-1.2% C, <=1.0% Si, <=1.0% Mn, 11.0-20.0% Cr, 1.0-2.0% Mo, 0.05-0.6% V and the remainder of Fe and impurities as a material into a traveler of a given shape, then subjecting the formed wire to vacuum quenching at, e.g. 1,030 deg.C, and soft nitriding or nitriding treatment. Furthermore, the nitriding treatment is carried out by, e.g. holding the traveler at 570 deg.C in a blend gas of 50% RX gas consisting of 24% CO, 30% H2, 45% N2, 1% CO2 and 1% CH4 and 50% NH2 gas at 570 deg.C for 4hr and quenching the resultant traveler in N2 gas atmosphere. |
