Millarray for producing ultra-fine crystal bar and milling method thereof

A technology of ultra-fine grain and rolling mill, which is applied in the direction of metal rolling, metal rolling, manufacturing tools, etc., can solve the problems of low accuracy and insufficient temperature control ability, so as to improve performance, save the amount of alloy elements, and save energy. socially realized effects

Inactive Publication Date: 2009-09-02
CHINA IRON & STEEL RES INST GRP +1
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can overcome the problems of insufficient temperature control ability and low accuracy of the existing rolling line

Method used

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  • Millarray for producing ultra-fine crystal bar and milling method thereof

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Embodiment Construction

[0039] The present invention will be further described below in conjunction with drawings and embodiments.

[0040] figure 1 It is a schematic diagram of the overall layout of the rolling line, and the heating furnace and cooling bed are not shown. Among them, 1-3 are the water-through cooling sections after the middle rolling, pre-finishing and finishing mills respectively. The 18 rolling mills all use high-precision short-stress line rolling mills, which are arranged alternately horizontally and vertically, which can realize continuous torsion-free rolling of bars. Rolling mills 1-10 are micro-tension rolling, and rolling mills 11-18 are tension-free rolling controlled by vertical loops.

[0041] The water-piercing devices of the three water-piercing cooling sections adopt segmental turbulent-flow water coolers, which are installed on hydraulic reciprocating traverse trolleys, which can be equipped with conveying roller tables, and can be combined with each other for singl...

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Abstract

The invention belongs to the field of metal material molding and processing, in particular relates to a mill array for producing an ultra-fine crystal bar and a milling method thereof. The milling method comprises the following steps: a coarse milling section, a middle milling section and a finish milling section with a water penetration cooling section at the rear are continuously milled without twist, mills are horizontally and alternately arranged, wherein a post finish milling section is arranged in front of the finish milling section, and water penetration cooling sections are respectively arranged at the rear of the middle milling section and / or the finish milling section. The mill array has strong temperature control capability and effectively solves the problem that the temperature control capability of the prior bar milling lines is insufficient; an ultra-fine crystal bar is milled at low temperature, can be controlled to be cooled after being milled in the middle middling section and the preliminary finish milling section and can be controlled above a transformation point in the finish milling section; heavy draught cumulation deformation is adopted to induce the phase change of ferrite, after being milled, the ultra-fine crystal bar mill can be controlled to be cooled to keep fine crystal left, and organizations which are fined into 3 mu m and use the ferrite as a base body are obtained, thus the strength of the steel can be increased by at least one level through the effects of fine crystal reinforcement and phase change reinforcement without the necessity of adding an alloying element.

Description

technical field [0001] The invention belongs to the field of metal material forming and processing, and in particular relates to a rolling mill train and rolling method for producing ultra-fine-grained rods. Background technique [0002] The strength and toughness of steel can be improved by reducing the grain size of the microstructure. The smaller the austenite grain size, the greater the deformation of the austenite before the cooling phase transformation, and the final ferrite-pearlite structure. The smaller the grain size. Grain refinement is the most effective way to improve the strength and toughness of steel, and the research on the grain refinement of bar has also shifted from simple rapid cooling after rolling to deformation-induced ferrite transformation. Deformation-induced ferrite transformation (DIFT) refers to the phase transformation phenomenon in which austenite is cooled to a certain temperature range above the transformation point and transformed into fer...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B1/16B21B45/02
Inventor 潘家冰杨现亮
Owner CHINA IRON & STEEL RES INST GRP
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