A cold-packing production process of high-density, high-purity fine-grained ball steel

A technology of production process and compactness, which is applied in the field of cold-packing production process of high-density, high-purity fine-grained ball steel, which can solve the problems of coarse as-cast structure, high connection requirements, and inability to spread the billet in time. problems, to achieve the effect of improving the ability to absorb inclusions and improving the purity of molten steel and reducing energy consumption
CN112281061BActive Publication Date: 2022-06-07JIANGSU LIHUAI IRON AND STEEL CO LTD +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
JIANGSU LIHUAI IRON AND STEEL CO LTD
Publication Date
2022-06-07

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Abstract

The invention discloses a cold-packing production process of high-density and high-purity fine-grained ball steel, comprising the following processes: molten iron pre-desulfurization-converter smelting-LF furnace refining-RH vacuum treatment-continuous casting-big round billet casting Billet slow cooling-heating-rolling-cooling-high temperature slow cooling in the pit-exit finishing-packing and storage. The heating of the present invention adopts the temperature control of the cold charging of the ball-milled steel round billet, and adopts the combination of differential temperature rolling and single-pass high-pressure rolling, which increases the deformation of the core of the billet and improves the internal compactness of the steel. and grain size. The grinding ball steel produced by the patent of the present invention has excellent low-magnification structure (center porosity≤1.0 level, general porosity≤0.5 level), high purity (type A inclusions≤1.0 level, B type inclusions≤0.5 level, C type inclusions Inclusions ≤ 0.5 grade, D-type inclusions ≤ 1.0 grade), fine austenite grains (austenite grain size ≥ 6.5 grades) advantages. The produced grinding ball steel has good impact toughness and high fatigue life through the conventional rolling process.
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Description

technical field

[0001] The invention belongs to the technical field of steel for wear-resistant balls, and particularly relates to a cold-packing production process of high-density, high-purity, fine-grain grinding ball steel. Background technique

[0002] Although high carbon content can improve the wear resistance of steel ball steel, when such steel balls are rolled, if the carbide cannot be diffused at high temperature by high temperature heating for a long time, massive carbides will be precipitated in the structure. Lumpy carbides can have a very adverse effect on the wear resistance and fatigue properties of steel balls.

[0003] For the breaking of steel balls, it is mainly affected by two aspects: on the one hand, the breaking of the steel ball during the manufacturing process; on the other hand, the breaking of the steel ball during use. cost of the ball.

[0004] The control of broken balls in the production process of steel balls mainly lies in the adjustment o...

Claims

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