Endless hot rolling method of high grade steel

A hot continuous rolling, high-grade steel technology, applied in metal rolling and other directions, can solve the problems of inability to ensure the pass through, reduce the joint strength ratio, minimize bending deformation, prevent process obstruction, and improve rolling through the plate. rate effect

Active Publication Date: 2018-02-23
浦项股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] When such high-grade steel is shear-bonded by the above-mentioned bonding technology, a large amount of scale is mixed on the joint surface, thereby reducing the joint strength ratio, and thus, there is no way to ensure plate passability during endless continuous rolling of high-grade steel. The problem

Method used

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  • Endless hot rolling method of high grade steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-1

[0146] Using a welding wire containing 80% iron powder and 20% fluorite powder as flux, 80% Ar and 20% CO 2 Used as a shielding gas, using 280A current, 30V voltage, 10.5kJ / cm heat input and 480mm / min welding speed, on high carbon steel (S45C) with a thickness of 250mm, a width of 1000mm, and a length of 10000mm One pass of flux-cored arc welding (FCAW) was performed on the shear joint of the billet. Then, an ordinary thin steel plate is arranged on the welded part, and the high-carbon steel slab is reheated and rough-rolled for 1 hour at a temperature of 1250° C., wherein, in weight %, the ordinary thin steel plate contains: Si: 0.2% or less, Cr: 0.2% or less, C: 0.3% or less, Mn: 1.6% or less, Cu: 0.3% or less, P: 0.04% or less, S: 0.04% or less and the balance Fe. Then, shear joining was carried out and finish rolling was performed to manufacture a hot-rolled coil with a total reduction ratio of 90% or more.

Embodiment 1-2

[0148] Metal powder containing 80% iron powder and 20% fluorite powder dissolved in vacuum is sprayed on the shear joint of high-carbon steel (S45C) billets with a thickness of 250 mm, a width of 1,000 mm, and a length of 10,000 mm. At the same time, continuous strip cladding of ordinary thin strip steel, wherein, in weight %, the ordinary thin strip steel contains: Si: 0.2% or less, Cr: 0.2% or less, C: 0.3 % or less, Mn: 1.6% or less, Cu: 0.3% or less, P: 0.04% or less, S: 0.04% or less and the balance Fe. Then, at a temperature of 1250° C., the high-carbon steel slab was reheated and rough-rolled for 1 hour. Then, shear joining was carried out and finish rolling was performed to manufacture a hot-rolled coil with a total reduction ratio of 90% or more.

Embodiment 1-3

[0150] Using a welding wire containing 80% iron powder and 20% fluorite powder as flux, 80% Ar and 20% CO 2 Used as a shielding gas, using 280A current, 30V voltage, 10.5kJ / cm heat input and 480mm / min welding speed, on high carbon steel (S45C) with a thickness of 250mm, a width of 1000mm, and a length of 10000mm One pass of flux-cored arc welding (FCAW) was performed on the shear joint of the billet. Then, at a temperature of 1250° C., the high-carbon steel slab was reheated and rough-rolled for 1 hour. Then, shear joining was carried out and finish rolling was performed to manufacture a hot-rolled coil with a total reduction ratio of 90% or more.

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Abstract

The present invention discloses an endless hot rolling method of high grade steel. The endless hot rolling method of high grade steel hot strip rolling method for producing high grade steel. Accordingto the high-strength steel hot rolling method of embodiments of the present invention, the endless hot rolling method of high grade steel is joined by overlapping two ends of a plurality of joining materials and performing shear deformation includes the following steps: using Si and Cr A modified material having a smaller content than the bonding material forms a surface modification layer on atleast any of two ends overlapping the bonding material; and overlapping both ends of a plurality of bonding materials and performs shearing cut deformation.

Description

technical field [0001] The present invention relates to a hot continuous rolling method of high-grade steel, more specifically, relates to a hot continuous rolling method of high-grade steel capable of increasing the rolling pass rate of the joint, so that the partial surface modified material is produced during hot rolling. The method of minimizing the serious bending phenomenon of the surface, and the method of minimizing the phenomenon that the elements contained in the base material are diluted to the surface modification part when the surface is partially modified. Background technique [0002] Recently, an endless continuous rolling technology that enables continuous finish rolling by joining front and rear metal sheets between a rough rolling mill and a finish rolling mill is being developed. [0003] For example, it is known that the rear end of the front metal plate and the front end of the rear metal plate are overlapped up and down, and the overlapped portion of t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B1/26B21C37/02
CPCB21B1/26B21C37/02
Inventor 姜润熙韩一煜李钟燮金纯钟金镇浩
Owner 浦项股份有限公司
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