Method for improving quenching uniformity of inner-spraying and outer-sprinkling quenching system

A quenching system and uniformity technology, which is applied in the direction of quenching device, furnace type, furnace, etc., can solve the problems of increased production cost and performance qualification rate not meeting 100% requirements, so as to improve the qualification rate, uniformity and stability The effect of sexiness and convenient operation

Inactive Publication Date: 2019-12-31
DALIPAL PIPE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The existing technology can also improve the hardenability of the material to achieve the requirement of improving the uniformity of the performance of the entire steel pipe, that is, by adding a small amount of alloying elements such as Mn, Cr, Mo, etc., to improve the hardenability. For example, Baotou Steel uses 30MnCr22 material to adjust Quality L80-1 steel grade, the Cr element is intentionally added to the material to improve hardenability, but in mass production, the pass rate of the first inspection is only 94.8%, and the pass rate after the re-inspection is only 99.4%, which increases the production cost, but The final performance qualification rate still does not meet the 100% requirement

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Production of steel pipes with a specification of φ127mm and a wall thickness of 11.1mm;

[0028] According to the process requirements, the outer surface water replenishment system and the outer shower water system are turned on at the same time;

[0029] According to the specifications of the steel pipes to be produced, the ratio of the external surface water replenishment system is set to 55%.

[0030] According to the process requirements, set the interval between the outer water spray system and the inner water spray system as 2s;

[0031] After the hot steel pipe is turned over to the radial rotating wheel, it rotates with the rotating wheel and is pressed by the pressing wheel;

[0032] Turn on the cooling water system, 2 seconds after the outer shower system and the outer surface water replenishment system are turned on, and then turn on the inner water spray system, in which the inner water spray system and the outer surface water replenishment system share a ...

Embodiment 2

[0036] Production of steel pipes with a specification of φ177.8mm and a wall thickness of 8.05mm;

[0037] According to the process requirements, the outer surface water replenishment system and the outer shower water system are turned on at the same time;

[0038] According to the specifications of the steel pipe to be produced, set the ratio of the external surface water replenishment system to 25%;

[0039] According to the process requirements, set the interval between the outer water spray system and the inner water spray system as 2s;

[0040] After the hot steel pipe is turned over to the radial rotating wheel, it rotates with the rotating wheel and is pressed by the pressing wheel;

[0041] Turn on the cooling water system, 2 seconds after the outer shower system and the outer surface water replenishment system are turned on, and then turn on the inner water spray system, in which the inner water spray system and the outer surface water replenishment system share a ma...

Embodiment 3

[0045] Production of steel pipes with a specification of φ244.5mm and a wall thickness of 11.99mm;

[0046] According to the process requirements, the outer surface water replenishment system and the outer shower water system are turned on at the same time;

[0047] According to the specifications of the steel pipes to be produced, the proportion of the external surface water replenishment system is set to 65%;

[0048] After the hot steel pipe is turned over to the radial rotating wheel, it rotates with the rotating wheel and is pressed by the pressing wheel;

[0049] Turn on the cooling water system, 2 seconds after the outer shower system and the outer surface water replenishment system are turned on, and then turn on the inner water spray system, in which the inner water spray system and the outer surface water replenishment system share a main pipeline, and the flow rate is set at 900-1300m 3 / h, the flow rate of the shower water system is set to 1800~2400m 3 / h;

[00...

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PUM

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Abstract

The invention discloses a method for improving the quenching uniformity of an inner-spraying and outer-sprinkling quenching system and relates to the technical field of thermal treatment of seamless tubes. The main point of the method lies in that a water replenishing device is designed in the quenching system, part of cooling water which is hindered by a compacting device is replenished, different water replenishing processes are adopted according to the property requirements of steel tubes with different specifications and different steel grades, thus the uniformity of the quenching effect is improved, the problem that the overall-length property of the steel tubes is non-uniform is solved, the qualified rate of the steel tubes is improved, and the characteristics that the system is simple, operation is convenient and fast, and the effects are good are achieved.

Description

technical field [0001] The invention relates to the technical field of heat treatment of seamless pipes, in particular to a method for improving the quenching uniformity of an inner spray and outer shower quenching system. Background technique [0002] Bench quenching is a new type of quenching and cooling of steel pipes that has emerged in recent years. It is to place the steel pipe on the quenching bench and press it tightly. While the steel pipe is rotating, the steel pipe is cooled by axial flow on the inner surface and laminar flow on the outer surface. Water quenching technology. When quenching, the steel pipe is placed on the radial rotating wheel and rotates together with the radial rotating wheel, both of which have the same linear speed. At the same time, the steel pipe is compressed with a compression device to limit the beating of the steel pipe during rotation. However, during quenching, the pressure wheel placed on the upper part of the steel pipe also blocks ...

Claims

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Application Information

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IPC IPC(8): C21D9/08C21D11/00C21D1/18C21D1/667
CPCC21D1/18C21D1/667C21D9/085C21D11/00
Inventor 李英真张佳龙高林
Owner DALIPAL PIPE
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