Cooling method for controlling lateral bending deformation after rolling of marine L-shaped steel

A cooling method and side control technology, applied in metal rolling, temperature control, metal rolling, etc., to achieve good realizability, increase yield, and reduce severe side bending

Active Publication Date: 2021-07-09
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of the above technical problems, the present invention provides a cooling method for controlling side bending deformation of marine L-shaped steel after rolling, which applies forced water cooling with different strengths and adjustable strength to different parts of the L-shaped steel to improve the cooling uniformity of the L-shaped steel, thereby improving Severe side bending deformation of L-shaped steel after cooling to normal temperature on the upper cooling bed

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  • Cooling method for controlling lateral bending deformation after rolling of marine L-shaped steel

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Embodiment 1

[0021] A cooling method for controlling side bending deformation of marine L-shaped steel after rolling, comprising the following steps:

[0022] Step 1: After finishing the finish rolling of the billeted L-shaped steel billet for marine use, the L-shaped steel for marine use 6 after final rolling is obtained, followed by rapid cooling treatment, and different strengths are applied to the three parts of the L-shaped marine steel 6 after final rolling cooling, such as figure 1 As shown, the nozzles of No. I water tank 1 and No. II water tank 2 are used to water-cool the positions on both sides of the panel, the nozzles of No. III water tank 3 and No. IV water tank 4 are used to water-cool the positions on both sides of the web, and the nozzles of No. V water tank 5 are used. The nozzle is water-cooled at the R angle position, and the cooling intensity is: the cooling intensity at the R angle position > the cooling intensity at both sides of the panel > the cooling intensity at ...

Embodiment 2

[0032] A cooling method for controlling side bending deformation of marine L-shaped steel after rolling, comprising the following steps:

[0033] Step 1: after finishing rolling of the billeted L-shaped steel billet for marine use, the L-shaped steel for marine use after final rolling is obtained, followed by rapid cooling treatment, and different intensities of cooling are applied to the three parts of the L-shaped marine steel after final rolling, The cooling method is the same as in Example 1, and the cooling intensity is: the cooling intensity at the R angle position > the cooling intensity at both sides of the panel > the cooling intensity at both sides of the web plate, the overall cooling rate of L-shaped steel for ships is 50°C / s, and the cooling time is is 6s, and the final cooling temperature is 620°C, and the marine L-shaped steel after final cooling is obtained;

[0034] Step 2: After the final cooling, the marine L-shaped steel returns to temperature at 711-719°C,...

Embodiment 3

[0043] A cooling method for controlling side bending deformation of marine L-shaped steel after rolling, comprising the following steps:

[0044]Step 1: after finishing rolling of the billeted L-shaped steel billet for marine use, the L-shaped steel for marine use after final rolling is obtained, followed by rapid cooling treatment, and different intensities of cooling are applied to the three parts of the L-shaped marine steel after final rolling, The cooling method is the same as in Example 1, and the cooling intensity is: the cooling intensity at the R angle position > the cooling intensity at both sides of the panel > the cooling intensity at both sides of the web plate, the overall cooling rate of marine L-shaped steel is 70°C / s, and the cooling time is is 3s, the final cooling temperature is 670°C, and the marine L-shaped steel after final cooling is obtained;

[0045] Step 2: After the final cooling, the marine L-shaped steel returns to temperature at 754-765°C, and the...

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Abstract

The invention discloses a cooling method for controlling lateral bending deformation after rolling of marine L-shaped steel, and belongs to the field of manufacturing of marine structural steel. The cooling method comprises the following steps that water cooling with different strengths is applied to each part of the L-shaped steel according to section characteristics and heat dissipation rules of the L-shaped steel, so that the cooling strength of an R angle position is greater than that of two sides of a panel and two sides of a web; the cooling strength of the positions of the two sides of the panel is larger than that of the positions of the two sides of the web, so that the uniformity of the cooling temperature of the L-shaped steel in the cooling process is improved, serious lateral bending of the L-shaped steel caused by uneven cooling is eliminated or relieved, the effects of improving the steel quality and increasing the yield are achieved, and the yield can be increased to 95% or above from 83% of an existing cooling technology; and the bending amount H is reduced from 0.1 m or more to 0.01-0.05 m.

Description

technical field [0001] The invention belongs to the field of marine structural steel manufacturing, in particular to a cooling method for controlling side bending deformation of marine L-shaped steel after rolling. Background technique [0002] Hot-rolled L-shaped steel is mainly used in the shipbuilding industry and is an important steel for hull structure. With the rapid development of the shipbuilding industry at home and abroad, the demand for L-shaped steel is increasing day by day, and the market prospect is increasingly broad. Compared with foreign countries, there are problems of low production efficiency and finished product rate in the production of domestic marine L-shaped steel, and its finished product rate has been maintained at about 83% for a long time. L-shaped steel is a flat asymmetric cross-section profile, and the heat storage of each part is different. At present, the cooling method of domestic L-shaped steel is mainly natural air cooling, which causes...

Claims

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Application Information

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IPC IPC(8): B21B37/74B21B45/02
CPCB21B37/74B21B45/0203
Inventor 赵宪明李杰
Owner NORTHEASTERN UNIV
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