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Hot rolling method and apparatus for hot steel sheet

A technology of steel plates and heaters, applied in workpiece heating devices, metal rolling, metal rolling, etc., can solve problems such as incompensation, large heaters, and insufficient temperature rise

Inactive Publication Date: 2005-09-28
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If you want to compensate the temperature drop of more than 200°C at the front end or the end end, you need a large heater, and the investment will be very large
On the other hand, if a general-sized solenoid-type induction heater is used, it cannot compensate for the temperature drop of more than 200°C at the front and rear ends of the rough bar, and therefore, in addition to shape defects, there are still defects at the front or tail. The portion where the temperature has not risen sufficiently, so the remaining low temperature portion must be clipped

Method used

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  • Hot rolling method and apparatus for hot steel sheet
  • Hot rolling method and apparatus for hot steel sheet
  • Hot rolling method and apparatus for hot steel sheet

Examples

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Effect test

no. 1 example

[0092] It is known that when obtaining a hot-rolled steel sheet with predetermined material properties in the width direction, that is, no change in material (properties) in the width direction, the temperature in the width direction of the rough bar on the feed side of the finishing mill must be adjusted to The distribution plot remains uniform. In the past, it was thought that if an edge heater was used to increase the temperature of the temperature drop portion of both edges of the rough bar caused by rough rolling, the temperature profile in the width direction of the rough bar would become uniform.

[0093] However, the material properties of the finish-rolled hot-rolled steel sheet vary in the width direction after heating both edges of the rough bar with an edge heater.

[0094] Therefore, the inventors conducted various experiments to find the cause, and as a result, found that the cause was present when the slab was heated in the heating furnace.

[0095] That is, b...

no. 2 example

[0119] In addition, the inventors have also found that if the finish rolling is performed so that there is a temperature difference in the width direction of the steel sheet before the finish rolling is performed to produce a special steel sheet having different characteristics in the width direction of the steel strip, especially the hole expansion characteristic and the elongation characteristic, , then through hot rolling, the hole expansion characteristics of the steel plate can be effectively improved by using the hot finish rolling temperature.

[0120]For example, when a high tensile strength steel strip of the 590 MPa grade comprising 0.09 to 0.11% carbon, 1.30 to 1.50% silicon, 1.25 to 1.45% manganese, not more than 0.010% phosphorus and not more than 0.002% sulfur is applied In the case of beams or other automobile parts, this part is cut in the width direction of the steel strip. From the shape of this part (derived), the main processing is reaming forming near the ...

no. 3 example

[0136] In the hot rolling device shown in Fig. 1, two transverse induction heaters 2 having different core widths are provided, that is, a transverse induction heater 23 with a core width greater than that of the rough bar 4 and a core A transverse induction heater 24 with a width smaller than that of the rough bar is provided with an edge heater 6 to form a hot rolling device.

[0137] A thermometer 22 in the width direction of the feed side is arranged on the feed side of the two transverse induction heaters with different core widths, and a thermometer 25 in the width direction of the discharge side is arranged on the discharge side. The rough bar 4 rolled by a roughing mill is conveyed in the direction of the arrow by conveying rollers. Use the feed side width direction thermometer 22 to measure the temperature profile in the width direction of the crude rod 4, then use the temperature rise controller to determine the temperature distribution due to the transverse inductio...

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Abstract

A hot rolling method and apparatus for producing hot rolled steel sheet free from variation in material properties in the width direction by making a temperature profile uniform over the entire width direction of a rough bar at a finishing mill entry side or exit side are provided, which hot rolling method of steel sheet heating a rolling material while changing a temperature rise in a width direction of the rolling material so that a temperature profile in a width direction of the rolling material at the finishing mill (7) entry side or exit side becomes uniform, for example, heating so that at least the temperature rise at a center of the rolling material in the width direction becomes greater than the temperature rises at intermediate parts between that center and the two edges in the width direction or heating so that the temperature rises at the two edges of the roughing mill in the width direction become greater than the temperature rises at the intermediate parts in the width direction of the width direction.

Description

technical field [0001] The present invention relates to hot rolling of steel plates, and more particularly, to a method for making the temperature in the width direction of a rough bar on the feed side of a finishing mill a predetermined temperature profile (profile ) to produce a hot-rolled method and apparatus for hot-rolled steel sheets with high yield. technical background [0002] As shown in Figure 1, the hot rolling of steel plate is carried out like this: a low-temperature slab 2 is loaded into a heating furnace 1 to reheat the slab to a predetermined temperature, utilize a rough rolling mill 3 to reheat the slab The slab 2 is rolled to a predetermined thickness to obtain a rough bar 4, the front end and the tail end of the rough bar are cut off by a shearing machine 5, and the two edges are heated by an edge heater 6 to compensate for the rough bar. The temperature drop at the two edges in the width direction of the bar 4 is finished rolled into a predetermined hot...

Claims

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Application Information

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IPC IPC(8): B21B1/26B21B37/74B21B45/00
CPCB21B45/004B21B1/26B21B37/74B21B2261/21C21D8/0263C21D8/0447C21D8/0478C21D2221/02B21B45/00
Inventor 吉田满木村宽野口浩嗣中本武广坂上浩喜高桥航也吉山智明山田彻哉岩尾雄介
Owner NIPPON STEEL CORP
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