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Ultra fast cooling and conventional laminar flow cooling method for medium plate

An ultra-fast cooling and laminar cooling technology, applied in the field of metallurgy, can solve the problems of difficult to control the shape of the steel plate, difficult to correct the shape of the steel plate, difficult to produce medium and thick plates, etc., to achieve good process performance, improve cooling speed, and adjust flexibly Effect

Active Publication Date: 2012-06-27
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the field of medium and heavy plate production, due to problems such as low final cooling temperature and limited capacity of straightening machines, it is difficult to control the shape of the steel plate, which has brought many difficulties to the production of medium and heavy plates
For example, when high-grade steel is produced and the final cooling temperature is low, the strength of the steel plate is much greater than the maximum straightening capacity of the straightening machine, which makes it difficult to correct the shape of the steel plate and reduces the yield of the steel plate

Method used

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  • Ultra fast cooling and conventional laminar flow cooling method for medium plate
  • Ultra fast cooling and conventional laminar flow cooling method for medium plate
  • Ultra fast cooling and conventional laminar flow cooling method for medium plate

Examples

Experimental program
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Effect test

Embodiment 1

[0035] Straightening first and then forward cooling method: to produce EH36 ship plate with a thickness of 40mm, using attached figure 1 The deployed equipment implements straightening first and then forward cooling technology, which is characterized by the use of ultra-fast cooling equipment alone. Step 1 is shown in the attachment figure 2 : Step 1: Dephosphorize the steel billet heated to 1000~1200℃, and then transport it from the conveyor roller table to the rolling mill for multiple passes to make a final-rolled medium-thick plate with a target thickness of 40mm or more. See step 2 Attached image 3 After the steel plate 6 exits the rolling mill 1, it is transported by the conveyor roller table. The rapid (at full roll speed) air cooling passes through the ultra-rapid cooling equipment 2 and the conventional laminar flow cooling equipment 3. The passing speed is the maximum roller table speed, and the two sets of water cooling equipment are not turned on. , Straightening st...

Embodiment 2

[0037] The method is basically the same as that of the above-mentioned Example 1, the difference is that the ultra-fast cooling equipment 2 is used alone to cool the 40mm thick EH36 marine steel plate 6 to 550°C, see attached Figure 5 Step 4. The cooling rate is controlled at 30°C / s, Image 6 As shown in step 5, the super fast cooling water supply pressure is also 0.5 MPa, and the steel plate 6 is transported to the cooling bed after controlled cooling. Example 2: Ultra-rapid cooling equipment 2 After straightening first and then forward cooling process, compared with the conventional laminar cooling, first straightening and then forward cooling process, the yield strength of the steel plate is increased by 8-12%, and the tensile strength is increased by 4 -6%.

[0038] Examples 1 and 2 both use ultra-fast cooling equipment alone. Example 1 "cools the steel plate to 450°C, the cooling rate is controlled at 15°C / s, and the ultra-fast cooling water supply pressure is 0.5MPa,", Exam...

Embodiment 3

[0040] Straightening first and then forward cooling method: to produce 50mm thickness EH36 ship plate, according to the attached figure 1 The shown combined arrangement of ultra-rapid cooling equipment 2 and conventional laminar flow cooling equipment 3, the steel plate 6 is heated to 1200 ℃, rolled into a steel plate with a thickness of 50 mm, see attached figure 2 Step 1: After the steel plate 6 exits the rolling mill 1, it is transported by the conveyor roller table, and the rapid air cooling passes through the ultra-rapid cooling equipment 2 and the conventional laminar flow cooling equipment 3. The two sets of water cooling equipment are not turned on, see attached image 3 Step 2. Go to the straightening machine 5 for straightening. After the straightening is completed, the drive motor of the transfer roller reverses, so that the steel plate 6 is reversed and quickly air cooled through the ultra-fast cooling device 2 and the conventional laminar flow cooling device 3, see at...

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Abstract

The invention discloses an ultra fast cooling and conventional laminar flow cooling method for a medium plate, comprising the steps of rolling to obtain a medium plate of 40-100mm; positively and quickly air cooling the medium plate by delivering through a post-rolling cooling device to a straightening machine, inversing a transmission roller motor after the medium plate is straightened, so that the plate is subjected to quick air cooling by the post-rolling cooling device and returned to a post-rolling roller before an ultra fast cooling device by the post-rolling cooling device; controlling a program which calculates the water cooling procedure according to the cooling starting step, ultra fast cooling stopping step, laminar flow cooling stopping step and self-tempering temperature of the rolling process of the medium plate; controlling the ultra fast cooling device or / and a conventional laminar flow cooling device by a process instruction to carry out the cooling program corresponding to the steel plate; allowing the steel plate to pass through the cooling device and the straightening machine and sending to a cooling bed. Great cooling speed, sectional cooling and cooling speed big range adjustable process is realized by using the method provided in the invention, by use of the ultra fast cooling device alone or in combination with the laminar flow cooling.

Description

Technical field [0001] The invention belongs to the technical field of metallurgy, and particularly relates to a method for realizing a medium-thickness plate first straightened and then positively cooled by using ultra-fast cooling and conventional laminar cooling equipment. Background technique [0002] Ultra Fast Cooling (UFC), as a controlled cooling device with extremely strong cooling capacity, has significant advantages in the production of high-strength Nb-containing steel by controlled rolling and controlled cooling, which can reduce the use of Nb elements and make The above-mentioned problems that occur during the rolling of Nb-containing steel can be easily solved. The new generation TMCP (Thermo Mechanical Control Process) technology with ultra-fast cooling technology as the core can maximize the contribution of Nb element to the strength and toughness, and is one of the most effective ways to produce low-cost high-strength steel. [0003] The central idea of ​​this te...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B45/02
Inventor 王丙兴王昭东田勇袁国李勇韩毅胡啸
Owner NORTHEASTERN UNIV
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