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Quenching treatment method of seamless stainless steel pipe for fluid

A stainless steel tube and processing method technology, applied in the field of steel tube quenching, can solve the problems of low return on investment, high requirements for heating furnaces, and large quenching device equipment, so as to achieve reprocessing and recycling, and reduce the rate of quenching and cracking rejects. , The effect of reducing the cost of quenching

Inactive Publication Date: 2020-04-17
NANJING WORLD SPECIAL STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these two processes are more suitable for quenching steel pipes with thicker walls. The corresponding quenching devices have larger equipment, occupy a large area, and have higher requirements for heating furnaces. For thin-walled steel pipes, the return on investment of the above two quenching devices not tall

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The material is Cr13, the outer diameter is 102mm, and the fluid with wall thickness is 6.5mm is quenched with a seamless stainless steel pipe. The method is as follows: immerse the bottom of the steel pipe heated above the austenitic temperature in water, The exit direction of the outlet is inclined downward at 5° to move in the quenching tank while rotating the steel pipe and spraying the outside of the steel pipe. The water flows through the overflow hole on the side wall of the quenching tank and overflows to the overflow pool at the bottom of the quenching tank until the temperature of the steel pipe drops. below the martensitic transformation temperature.

[0020] Wherein, the spraying to the outside of the steel pipe is carried out through nozzles that can adjust water pressure and direction. The nozzles are arranged on 7 sets of annular spray pipes arranged at intervals on the top of the quenching tank, and the intervals of the spray pipes are from dense to spar...

Embodiment 2

[0023] The material is ZG35, the outer diameter is 63.5mm, and the fluid with wall thickness is 4mm is quenched with a seamless stainless steel pipe. The method is as follows: immerse the bottom of the steel pipe heated to above the austenitic temperature in water, The exit direction of the outlet is inclined downward at 7° and moves in the quenching tank while rotating the steel pipe and spraying the outside of the steel pipe. The water flows through the overflow hole on the side wall of the quenching tank and overflows to the overflow pool at the bottom of the quenching tank until the temperature of the steel pipe drops. below the martensitic transformation temperature.

[0024] Wherein, the spraying to the outside of the steel pipe is carried out through nozzles that can adjust water pressure and direction. The nozzles are arranged on 7 sets of annular spray pipes arranged at intervals on the top of the quenching tank, and the intervals of the spray pipes are from dense to ...

Embodiment 3

[0027] The material is 30Mn, the outer diameter is 180mm, and the fluid with wall thickness is 10mm is quenched with a seamless stainless steel pipe. The outlet direction is inclined 6° downwards and moves in the quenching tank while rotating the steel pipe and spraying the outside of the steel pipe. The water flow overflows through the overflow hole on the side wall of the quenching tank to the overflow pool at the bottom of the quenching tank until the temperature of the steel pipe drops to Below the martensitic transformation temperature.

[0028] Wherein, the spraying to the outside of the steel pipe is carried out through nozzles that can adjust water pressure and direction. The nozzles are arranged on 7 sets of annular spray pipes arranged at intervals on the top of the quenching tank, and the intervals of the spray pipes are from dense to sparse along the moving direction of the steel pipe. The spray pipe is connected with the high-pressure water supply pipe, and the h...

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Abstract

The invention discloses a quenching treatment method of a seamless stainless steel pipe for a fluid, and belongs to the technical field of steel pipe quenching. The method comprises the following steps of immersing the bottom of the steel pipe heated until the temperature is above the austenite temperature into a quenching medium, rotating the steel pipe at the same time, and spraying the outer portion of the steel pipe until the temperature of the steel pipe falls below the martensite transformation temperature. Compared with an existing quenching treatment method adopting outer sprinkling and inner spraying or outer immersion and inner spraying, the method of bottom immersion and rotating outer spraying is adopted, the quenching cooling speed is high, cooling is uniform, the cost is low,quenching cracking phenomena can be effectively reduced, the surface quality of the stainless steel pipe is improved, and the cracking rejection rate of the seamless stainless steel pipe is reduced.

Description

technical field [0001] The invention belongs to the technical field of steel pipe quenching, in particular to a method for quenching seamless stainless steel pipes for fluids. Background technique [0002] Quenching can improve the hardness and wear resistance of metal workpieces. Cooling, as a key link in quenching treatment, has an important impact on the production efficiency, final product quality and economic benefits of steel pipe heat treatment. Among the various quenching technologies of steel pipes, water as a quenching medium can reduce environmental pollution, reduce the cost of steel pipes, and improve the performance of pipes. When quenching the steel pipe, the water on the surface of the steel pipe is heated and vaporized, so that the steel pipe is isolated from the water. Since the steam film is a poor conductor of heat, the cooling speed of the steel pipe is reduced. However, the cooling rate of the steel pipe during quenching must exceed the critical coolin...

Claims

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Application Information

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IPC IPC(8): C21D9/08C21D1/18
CPCC21D1/18C21D9/085
Inventor 潘金林王爵樑夏福红
Owner NANJING WORLD SPECIAL STEEL
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