Manufacturing apparatus for hot-rolled steel plate and manufacturing method for steel plate

A hot-rolled steel plate and manufacturing device technology, applied in the direction of braking/tensioning devices, metal rolling, manufacturing tools, etc., can solve problems such as hindering cooling water drainage, achieve excellent mechanical properties, increase cooling water volume, and promote rapid cooling Effect

Active Publication Date: 2012-04-18
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, when the cooling water is sprayed inside the shell of the final rolling mill, the erected portion of the shell becomes a wall, which may hinder the drainage of the cooling water.

Method used

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  • Manufacturing apparatus for hot-rolled steel plate and manufacturing method for steel plate
  • Manufacturing apparatus for hot-rolled steel plate and manufacturing method for steel plate
  • Manufacturing apparatus for hot-rolled steel plate and manufacturing method for steel plate

Examples

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Embodiment

[0123] Hereinafter, the present invention will be described in further detail based on examples. However, the present invention is not limited to these Examples.

[0124] In the example, let Q q 0.33[m 3 / (m 2 ·s)], h is 0.35[m], observed Figure 12 The gap distance W between the end portion of the uniform cooling width as shown and the housing erected portion 11gr sw Changes in case of stagnant water on the steel plate. The results are shown in Table 1. Here, when the tip of the cooling nozzle was not submerged in water and drainage was possible, it was evaluated by ○, and when the tip of the cooling nozzle was submerged in water, it was evaluated by ×. In addition, in each case, the left side of calculated formula (1) is shown together.

[0125] [Table 1]

[0126] W sw (m)

[0127] It can be seen from Table 1 that the gap distance W sw In the case of 0.44 [m], 0.32 [m], and 0.20 [m], the cooling water supplied from the header is smoothly discharged downw...

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Abstract

Provided are a manufacturing apparatus with high drainability for a hot-rolled steel plate and a manufacturing method for a steel plate, in a hot-rolled steel plate production line. In a manufacturing apparatus for a hot-rolled steel plate, a last stand thereof has a pair of raised portions in a housing, and a cooling device has a plurality of upper surface cooling nozzle arrays which are arranged in a transfer direction and which inject a cooling water onto an upper surface of a steel plate, a plurality of lower surface cooling nozzle arrays which are arranged along the transfer direction and which inject the cooling water onto the lower surface of the steel plate, and an upper surface guide on the upper surface side of the steel plate. The end of the cooling device on the last stand side is arranged between the raised portions. When the uniform cooling width is (W), the average gap distance between the ends of the uniform cooling width and the raised portions is (Wsw), the gravitational acceleration is (g), the average water rate density at the uniform cooling width is (Qq), and the value determined from (Wsw) and the average distance (h) between the upper surface guide and the upper surface of the steel plate is (C), a predetermined relationship is satisfied.

Description

technical field [0001] The present invention relates to a manufacturing device of a hot-rolled steel plate and a manufacturing method of a steel plate. Specifically, it relates to an apparatus for manufacturing a hot-rolled steel sheet excellent in drainage of a cooling medium, and a method for manufacturing a steel sheet using the apparatus. Background technique [0002] Steel materials used for automobiles, structural materials, and the like are required to have excellent mechanical properties such as strength, workability, and toughness. In order to comprehensively improve these mechanical properties, it is effective to refine the structure of the steel. Therefore, many methods of manufacturing steel materials having a fine structure have been searched for. Furthermore, by achieving microstructure, it is possible to manufacture a high-strength hot-rolled steel sheet having excellent mechanical properties even if the addition amount of alloy elements is reduced. [0003...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B45/02B21B1/26B21B39/08B21B39/14
CPCB21B45/0218B21B1/26B21B39/08B21B39/14B21B45/02
Inventor 宝诸知史原口洋一小林一晓
Owner NIPPON STEEL CORP
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