Ultra-thin hot-rolled narrow strip steel production line and its supporting technology

A narrow strip steel and production line technology, applied in metal rolling, temperature control and other directions, can solve the problems of difficult production, unstable rolling, high production cost, avoid rolling temperature drop, increase rolling speed, and reduce temperature. drop effect

Inactive Publication Date: 2017-07-18
JIANGXI HONGDU STEELWORKS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The 3 / 4 continuous rolling unit is used to produce hot-rolled narrow strip steel. For small and medium-sized enterprises, it has the advantages of simplifying equipment and independent production. The thickness of production is generally 1.5-5.0mm; for production thickness below 1.3mm The ultra-thin hot-rolled narrow strip steel, due to the defects in the production line design, the rolling is unstable, the production is difficult, the yield is low, and the production cost is high

Method used

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  • Ultra-thin hot-rolled narrow strip steel production line and its supporting technology
  • Ultra-thin hot-rolled narrow strip steel production line and its supporting technology
  • Ultra-thin hot-rolled narrow strip steel production line and its supporting technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Embodiment 1: In this implementation example, the rolling steel grade is Q235, and the specification is 132×1.3mm hot-rolled narrow strip steel.

[0050] During the rolling process, the rolling temperature of the steel strip is strictly controlled. The heating temperature (soaking section), starting rolling temperature and finishing rolling temperature of the steel strip are controlled at 1200-1310°C, 1140-1260°C, and ≥855°C, respectively. In this embodiment: the heating temperature is 1290°C, the best control is 1250-1300°C; the rolling start temperature is 1250°C, the best control is 1240-1260°C; the final rolling temperature is 865°C, the best control is ≥870°C.

[0051] During the rolling process, the rolling system of the steel strip is strict. details as follows:

[0052] 1. Rough rolling: single-stand rolling, including 5 passes with Φ600 rolling mill unit at a rolling speed of 2.7mm / s, and 3 passes with a Φ500 rolling mill unit at a rolling speed of 2.6mm / s. T...

Embodiment 2

[0057] In this implementation example, the rolling steel grade is Q195, and the specification is 163×1.2mm hot-rolled narrow strip steel.

[0058] In this embodiment: the heating temperature is 1280°C, the best control is 1240-1290°C; the rolling start temperature is 1240°C, the best control is 1230-1260°C; the final rolling temperature is 878°C, the best control is ≥860°C.

[0059] 1. Rough rolling: single-stand rolling, in which the Φ600 rolling mill unit rolled 3 passes at a rolling speed of 2.7mm / s, and the Φ500 rolling mill unit rolled 3 passes at a rolling speed of 2.6mm / s. The rolling schedule of each pass is the change of the cross-sectional area of ​​the rolled billet, which is expressed by length × width, and the length of the billet will continue to stretch and become longer according to the degree of deformation. The specific changes for each pass are shown in the table below:

[0060]

[0061] 2. Intermediate and finishing rolling: There are 14 passes in total...

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Abstract

The invention discloses an ultra-thin hot-rolled narrow-strip steel production line and its supporting technology. A thermal insulation cover is installed on the steel-passing roller table from the second rough rolling mill to the first intermediate vertical rolling mill unit. The first intermediate rolling flat rolling mill and the second intermediate rolling vertical rolling mill are sequentially installed between the rolling mill unit and the second intermediate rolling flat rolling mill unit; The eighth finishing rolling flat rolling unit is installed between them. In the present invention, through the addition and modification of the main equipment and auxiliary facilities of the 3 / 4 continuous rolling mill production line, as well as the adjustment and optimization of the rolling line, billet, rolling temperature, rolling mill speed, roll matching system, etc., to achieve stable The purpose of producing ultra-thin hot-rolled narrow strip steel.

Description

technical field [0001] The invention relates to a hot-rolled narrow-strip manufacturing technology, in particular to an ultra-thin hot-rolled narrow-strip production line and its supporting technology. Background technique [0002] At present, in the situation that the supply of hot-rolled narrow strip steel market exceeds demand and the competition is becoming increasingly fierce, a kind of hot-rolled narrow strip steel with a thickness of less than 1.3mm is produced to replace cold-rolled strip steel of corresponding specifications and become an economical substitute for its products. It has important practical significance to expand the market scope of hot-rolled narrow strip steel. The 3 / 4 continuous rolling unit is used to produce hot-rolled narrow strip steel. For small and medium-sized enterprises, it has the advantages of simplifying equipment and independent production. The thickness of production is generally 1.5-5.0mm; for production thickness below 1.3mm Due to ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21B1/26B21B37/74
Inventor 郝刚葛志刚邹少江彭宏志肖长春白帆
Owner JIANGXI HONGDU STEELWORKS CO LTD
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