Working roll for rolling medium-thickness plate with high grade and high strength and manufacture method thereof

Abstract

The invention discloses a working roll for rolling a medium-thickness plate with high grade and high strength and a manufacture method thereof. The working roll is applied to a medium-thickness plate rolling mill of a rolling steel industry. A working layer comprises the following alloy components in percentage by weight: 3.00-3.50 percent of C, 0.40-1.20 percent of Si, 0.50-1.20 percent of Mn, not more than 0.10 percent of P, not more than 0.05 percent of S, 1.30-2.50 percent of Cr, 3.20-4.50 percent of Ni, 0.20-1.00 percent of Mo, 0.20-2.00 percent of W and 1.00-1.50 percent of V. A roll core comprises the following chemical components in percentage by weight: 2.80-3.50 percent of C, 2.00-2.50 percent of Si, 0.50-1.00 percent of Mn, not more than 0.10 percent of P, not more than 0.05 percent of S, 0.20-0.50 percent of Cr, 0.20-0.60 percent of Ni, not more than 0.20 percent of Mo and not more than 0.30 percent of Re. The working roll manufactured by adopting a centrifugal composite casting process and two-section tempering production at 400-550 DEG C for 25-30 hours is the working roll for rolling the medium-thickness plate with high grade and high strength, which has the advantages of high abrasion resistance and less hardness reduction.

Description

technical field [0001] The invention relates to a roll and a manufacturing method thereof, in particular to a new material of nickel-chromium-molybdenum infinitely chilled cast iron suitable for a medium-thick plate rolling mill in the steel rolling industry, a high-grade, high-strength medium-thick plate rolling work Roller and method for its manufacture. Background technique [0002] Medium and heavy plate is an important steel product in the national economy. It is widely used in special fields such as ships, pipelines, and military industry. The market demand is large, especially pipeline steel above X70, high-strength ship plate with yield strength above 500MPa, and aircraft carriers and submarines. Extra-thick steel plate with high strength, high toughness and good lamellar tear resistance. At present, due to the relatively backward domestic production capacity and technical level, this kind still needs to be imported in large quantities. [0003] The work rolls used...

AI Technical Summary

Problems solved by technology

The reciprocating rolling has a large mechanical impact on the roll, and the thermal cracks on the roll surface are more and deeper

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