A high-pressure water descaling method for alloy steel plates

A high-pressure water descaling and alloy steel plate technology, applied in metal rolling, metal rolling, metal processing equipment, etc., can solve the problems of high cost of descaling and unclean descaling, and achieves no increase in equipment investment and enhanced descaling. net capacity, reducing the effect of furnace pig iron scale

Inactive Publication Date: 2018-02-02
SHANDONG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is exactly to provide a kind of high pressure water descaling method that is used for alloy steel plate in view of above-mentioned existing defect, adopts different methods to carry out systematic descaling at descaling box, rough rolling mill, finish rolling mill respectively, to overcome Problems of unclean descaling and high cost of descaling of steel plates with high alloy content

Method used

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  • A high-pressure water descaling method for alloy steel plates

Examples

Experimental program
Comparison scheme
Effect test

Embodiment １

[0026] The melting chemical composition of a certain low Cr and Mo alloy steel plate is shown in Table 1.

[0027] Table 1 Melting chemical composition of a certain low Cr and Mo alloy steel plate, %

[0028] .

[0029] After the slab 6 is heated in the heating furnace 1, the descaling box 3, the roughing mill 4 and the finishing mill 5 are descaled along the roller table 2 by different methods.

[0030] (1) The slab 6 is heated and kept warm, the temperature of the soaking section is 1220°C; the heating rate is 5.7min / cm; the temperature of the heating furnace 1 is 1105°C.

[0031] (2) Descaling box 3 descaling, water temperature: 8°C; number of upper and lower working nozzles: 112; nozzle flow rate: 30L / min; spray angle: 25°; nozzle outlet water pressure: 28MPa; vertical spray height: 130mm.

[0032] (3) Rotate 90° in front of the roughing mill 4 to change the position of the high-pressure water strike, bite into the gap between the upper and lower rolls at a slow speed,...

Embodiment 2

[0035] Example 2 A certain high Cr, Mo alloy steel plate, its melting chemical composition is shown in Table 2.

[0036] Table 2 Melting chemical composition of a certain high Cr, Mo alloy steel plate, %

[0037] .

[0038] After the slab 6 is heated in the heating furnace 1, the descaling box 3, the roughing mill 4 and the finishing mill 5 are descaled along the roller table 2 by different methods.

[0039] (1) The slab 6 is heated and kept warm, the soaking zone temperature: 1210°C; the heating rate: 5.6min / cm; the furnace temperature is 1117°C.

[0040] (2) Descaling box 3 descaling, water temperature: 9°C; number of upper and lower working nozzles: 116; nozzle flow rate: 31L / min; spray angle: 23°; nozzle outlet water pressure: 28MPa; vertical spray height: 120mm.

[0041] (3) Rotate 90° in front of the roughing mill 4 to change the position of the high-pressure water strike, bite into the gap between the upper and lower rolls at a slow speed, and completely remove the ...

Embodiment 3

[0044] Example 3 A certain high-Ni alloy steel plate, its melting chemical composition is shown in Table 3.

[0045] Table 3 Melting chemical composition of a certain high-Ni alloy steel plate, %

[0046] .

[0047] After the slab 6 is heated in the heating furnace 1, the descaling box 3, the roughing mill 4 and the finishing mill 5 are descaled along the roller table 2 by different methods.

[0048] (1) The slab 6 is heated and kept warm, the soaking zone temperature: 1230°C; the heating rate: 6.0min / cm; the furnace temperature is 1120°C.

[0049] (2) Descaling tank 3, water temperature: 5°C; number of upper and lower working nozzles: 122; nozzle flow rate: 32L / min; spray angle: 18°; nozzle outlet water pressure: 30MPa; vertical spray height: 112mm.

[0050] (3) Rotate 90° in front of the roughing mill 4 to change the position of the high-pressure water strike, bite into the gap between the upper and lower rolls at a slow speed, and completely remove the stubborn residual...

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Abstract

The invention discloses a high-pressure water descaling method for alloy steel plates. When a plate blank is heated, a heating temperature and a soaking temperature are controlled so as to reduce oxide scale produced in a furnace. Low-temperature high-pressure water is used for descaling in a descaling box, and by regulating the parameters of nozzles, hitting force and water quantity in unit area on the surface of the plate blank are increased so as to enhance the capability of clearing the oxide scale. The plate blank rotates for 90 degrees before a roughing mill so as to change high-pressure water hit positions and is slowly fed into a gap between upper and lower rollers. By controlling a small rolling reduction quantity and jet water pressure, stubborn remaining scales are thoroughly removed, after descaling, the plate blank anticlockwise rotates for 90 degrees to the initial position, and then, normal rolling operation is carried out. During the descaling of a finishing mill rack, high-pressure water jet descaling is separately carried out in the front three times to clear the oxide scale. The high-pressure water descaling method solves the problem that the descaling of the hot-rolled steel plates with high alloy content is not thorough without increasing equipment investment, saves energy, is favorable to environmental protection and makes a remarkable progress.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a high-pressure water descaling method for alloy steel plates. Background technique [0002] In the production of medium and heavy plates, the slab is almost rolled in a heating furnace after being heated at a high temperature and kept for a certain period of time. Generally, the soaking temperature is 1200-1300°C. At this high temperature, the Fe on the surface of the slab is oxidized Generate three oxides, commonly known as scales, from the outside to the inside: Fe 2 o 3 , Fe 3 o 4 , FeO, the vast majority of these three oxides are FeO, accounting for about 95% of the total scale. If the oxide scale is not removed, it will be pressed into the steel plate by the roll during the rolling process, forming surface quality defects such as pitting, scarring, and indentation. In order to improve the surface quality, domestic and foreign iron and steel enterprises have adopted ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21B45/08B21B37/00
CPCB21B37/00B21B45/08
Inventor 侯登义冯勇
Owner SHANDONG IRON & STEEL CO LTD
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