Rolling method for negative common difference steel plate

A negative tolerance, steel plate technology, applied in the direction of metal rolling, metal rolling, rolling mill control devices, etc., can solve problems such as uneven thickness, and achieve the effects of improving product yield, reducing self-weight, and increasing load capacity

Active Publication Date: 2011-03-16
HUNAN VALIN XIANGTAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These factors that cause thickness non-uniformity are sometimes integrated and intertwined, making it difficult for existing technologies to solve

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Embodiment 1: rolling a batch of 1000 tons of ship steel plates with a thickness of 10-20mm and a width of 2080-2880mm.

[0016] (1) Hydraulic thickness control: The bending force is set at 1800-2800KN, and the thickness setting is set as follows: according to the tolerance

[0017] - Rolling with a tolerance of 0.1-0mm; thickness compensation is carried out as follows: when the plate shape is good, rolling with free bending rolls; when high-chrome iron rolls are used, when the width of the finished product changes by 400-500mm, the roll gap and thickness deviation value will change regularly 0.1mm; for wide plates above 3000mm, every time the width changes by 100mm, the roll gap thickness deviation value changes regularly by 0.1mm. When the distance between the head and the rolling mill is 400-800mm, a thickness compensation of 0.2mm is given; within 200-300mm between the head and the rolling mill, a thickness compensation of (head position x×0.3 / 300-0.3)mm is given ;...

Embodiment 2

[0024] Roll a batch of 500 tons of ship steel plates with a thickness of 20-30mm and a width of 2880-3280mm.

[0025] (1) Hydraulic thickness control: The bending force is set at 1000-2000KN, and the thickness setting is set as follows: rolling with a tolerance of 0-0.1mm. Thickness compensation is carried out as follows: when the plate shape is good, rolling with free bending rolls; when high-chrome iron rolls are used, when the finished product width changes by 400-500mm, the roll gap and thickness deviation value change regularly by 0.1mm; for wide plates above 3000mm , every time the width changes by 100mm, the deviation value of the roll gap thickness changes by 0.1mm. When the distance between the head and the rolling mill is 400-800mm, a thickness compensation of 0.2mm is given; within 200-300mm between the head and the rolling mill, a thickness compensation of (head position x×0.3 / 300-0.3)mm is given ; The distance between the tail and the rolling mill is 400-200 mm, ...

Embodiment 3

[0032] Roll a batch of 500 tons of ship steel plates with a thickness of 8-12mm and a width of 3080-3580mm.

[0033] (1) Hydraulic thickness control: The bending force is set at 2000-2800KN, and the thickness setting is set as follows: Rolling with a tolerance of -0.1mm. Thickness compensation is carried out as follows: when the plate shape is good, rolling with free bending rolls; when high-chrome iron rolls are used, when the finished product width changes by 400-500mm, the roll gap and thickness deviation value change regularly by 0.1mm; for wide plates above 3000mm Every time the width changes by 100mm, the roll gap thickness deviation value changes by 0.1mm regularly. When the distance between the head and the rolling mill is 400-800mm, a thickness compensation of 0.2mm is given; within 200-300mm between the head and the rolling mill, a thickness compensation of (head position x×0.3 / 300-0.3)mm is given ; The distance between the tail and the rolling mill is 400-200 mm, a...

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PUM

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Abstract

The invention discloses a rolling method for a negative common difference steel plate, which adopts hydraulic gauge control, temperature control, rolling schedule making and roll crown design to produce the negative common difference steel plate. The main technological parameters are as follows: the roll-bending force is set to 1000-2800KN, the basic cooling water of a working roll is regulated to 50-70%, the added water is regulated to 10-40%, the roll crown ranges from -0.15 to +0.15, and the like. The pass of rate of rolled ship steel plates the thickness negative common difference of which ranges from -0.3 to 0mm, is more than or equal to 90%, thereby improving the yield of the steel plates, reducing the cost of steel per ton and the self-weight of a ship and increasing the dead weight capacity.

Description

technical field [0001] The invention belongs to a steelmaking method, in particular to a rolling method of a -0.3-0mm complete negative tolerance steel plate. technical background [0002] Generally, the thickness tolerance range of marine steel plates is -0.3mm to 1.1mm, and the delivery thickness of negative tolerance marine steel plates only allows a tolerance range of -0.3 to 0mm. Steel plate negative tolerance rolling is an advanced rolling process. The thickness of the finished product is slightly smaller than the thickness of the steel plate order, and it is controlled within the negative tolerance range of the national standard or enterprise standard. It can improve the product yield ( The weight of the plate is calculated according to the size), and it can meet special customer requirements. For example, when used in shipbuilding, the self-weight can be reduced under the premise of ensuring strength, which can have an immediate effect on reducing rolling costs and i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B1/22B21B37/16B21B37/74B21B27/02
Inventor 曹志强罗登郑生斌吴清明肖大恒李曲全
Owner HUNAN VALIN XIANGTAN IRON & STEEL CO LTD
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