A bd2 alloyed white cast iron roll and its manufacturing process

CN121802285BActive Publication Date: 2026-06-26CHENGDU SANQIANG ROLLING CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
CHENGDU SANQIANG ROLLING CO LTD
Filing Date
2026-03-12
Publication Date
2026-06-26

AI Technical Summary

Technical Problem

Existing BD2 alloy ductile iron rolls suffer from a problem of stress concentration and asynchronous microstructure transformation in the deep groove section, leading to hot cracking and delayed fracture, and resulting in high production costs.

Method used

By employing stepped-hole pre-casting and precise reheat spraying quenching processes, combined with micro-alloying technology, and controlling the chemical composition and heat treatment process, the temperature consistency between the deep groove section and the roller body surface is ensured. Furthermore, AlN nanoparticles are used for grain boundary pinning to achieve uniform transformation and strengthening of the microstructure.

Benefits of technology

This solved the problem of asynchronous stress concentration and microstructure transformation in the deep groove section, reduced the amount of precious alloys used, improved the hardness uniformity and crack resistance of the rolls, and extended their service life.

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Abstract

The application relates to a BD2 alloy nodular cast iron roller and a preparation process thereof, and relates to the technical field of rollers, and comprises smelting and pouring, stepped hole type pre-casting, and accurate back-temperature spray quenching treatment. Through the synergistic process of the stepped hole type pre-casting and the accurate back-temperature spray quenching, the problems of easy cracking and uneven hardness of the BD2 deep groove roller are solved from two aspects of physical structure and thermodynamics. Through a further micro-alloying improvement scheme, the traditional BD2 alloy strengthening idea of serious dependence on expensive nickel elements is broken through, trace amounts of aluminum and nitrogen elements are accurately introduced on the basis of reducing the nickel content, the in-situ synthesis and uniform dispersion distribution of high-melting-point AlN nano particles are realized by using the strong chemical affinity of the two in the iron liquid and a synchronous feeding technology of cored wires.
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