| 摘要 |
FIELD: process engineering.SUBSTANCE: invention relates to metallurgy and can be used for reconditioning of worn-out working rolls. First damaged ply is removed mechanically to heat the roll to 150-270°C. Arc deposition of wear-proof coating is performed with powder wore feed to welding area in at least three plies not over 9 mm in depth. Directly after deposition said roll is heated to 250-300°C and held thereat for at least one hour followed by cooling to not over 60°C.To get built-up ply over 9 mm in depth, powder wire is pre-deposited on roll surface to produce extra sub ply of preset depth. For deposition of extra sub ply powder wire is used that contains the following elements, wt %: 0.25-0.45 C, 0.7-1.2 Cr, 0.5-1.2 Mn, 0.15-1.2 Si, Cu<0.3, Ni<0.4, Fe making the rest. For deposition of wear-proof ply powder wire is used that contains the following elements, wt %: 0.25-0.45 C, 2.0-2.7 Cr, 0.5-1.2 Mn, 0.15-1.2 Si, 7-11 W, 0.15-0.55 V, Fe and gas- and slag-forming components making the rest.EFFECT: higher wear resistance, longer life.2 cl |
