Preparation method of nodular cast iron of alloy for roll

Abstract

The invention discloses a preparation method of nodular cast iron of alloy for a roll. The nodular cast iron comprises the following components in percentage by mass: 3.6-3.8% of C, 1.8-2.0% of Si, 0.5-0.7% of Mn, 0.01-0.04% of P, 0.01% of S, 0.1-0.3% of Cr, 0.11-0.14% of Mo, 1.5-2.0% of Ni, 0.4-0.6% of Mg, 0.04-0.06% of Mo, 0.06-0.1% of Nb, 0.1-0.15% of Ti, 0.2-0.4% of V and the balance of Fe and inevitable trace elements. According to the preparation method, matching of alloy elements is reasonably optimized, the mass percentages of Ni and Cr are optimized and Nb, Ti and V are added for improving the components of the roll, so that the morphology of carbides in the roll can be improved, the bending strength, impact toughness, deflection, area reduction rate, after-fracture elongation percentage and yield strength of the roll can be enhanced further, the problems that the inner surface layer of a hole slot in a finished-rolled roll body is peeled off can be solved, and the single-slot rolling quantity of a rolling mill can be increased.

Description

technical field [0001] The invention relates to a method for preparing nodular cast iron, in particular to a method for preparing alloy nodular cast iron for rolls. Background technique [0002] Iron and steel materials play an important role in social and economic life, and rolling steel into products requires a large amount of rolls. Therefore, the quality of the roll directly affects the quality and production cost of the steel. As the steel rolling process becomes increasingly automated, continuous and heavy-duty, the use conditions of the rolls are also becoming increasingly harsh. Equipping rolling mills with high-performance rolls has become an important research topic in the roll industry, and the optimization of roll materials is undoubtedly the basis for manufacturing high-performance rolls. [0003] Most of the existing roll materials are made of high-strength low-alloy structural steel. The degree of alloying of this type of material is low. After the final hea...

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Problems solved by technology

[0003] Existing roll materials mostly use high-strength low-alloy structural steel. The degree of alloying of this type of material is low. After the final heat treatment, the depth of the hardened layer can only meet the general requirements, and the tendency of spalling and cracking is serious during use. Low rolling life