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Thermal treatment method for high-grade steel casing pipe with reasonable deep processing properties

A heat treatment method and performance technology, applied in heat treatment furnaces, heat treatment equipment, manufacturing tools, etc., can solve the problems of low pass rate of pipe inspection, lower product quality, thread cutter wear, etc., achieve good tempering structure, improve hardening The effect of reliability and high pass rate

Inactive Publication Date: 2012-03-28
烟台宝钢钢管有限责任公司
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to overcome the deficiencies of the above-mentioned prior art, and provide a heat treatment method for high-grade steel casings with reasonable deep processing performance, mainly to solve the problem that the existing qualified high-grade steel casings are easily damaged during thread processing and screwing. There are problems such as thread cutter wear or steel sticking, which reduces the quality of the product and the pass rate of the first inspection of the pipe.

Method used

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  • Thermal treatment method for high-grade steel casing pipe with reasonable deep processing properties
  • Thermal treatment method for high-grade steel casing pipe with reasonable deep processing properties

Examples

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Embodiment 1

[0013] Example 1, see figure 1 , taking the 3Cr steel high-grade casing as an example, first adopt the dislocation method to distribute the steel pipe 1, and then heat it in the quenching furnace. The temperature in the heating section is 960±10℃, the temperature in the soaking section is 910±10℃, and the holding time is 50 minutes. Carry out water quenching, the flow rate of the external spray is ≥3000m3 / h, the flow rate of the internal spray is ≥1000m3 / h, the water quenching time is ≥30 minutes, the specification of the inner nozzle is 130mm, and finally enters the tempering furnace, the temperature of the heating section is 695±5°C, and the temperature of the soaking section is 695 The temperature is ±5°C, and the stepping rhythm is 45 minutes.

[0014] The heat-treated high-grade steel casing in Example 1 above has been tested and found to have a yield strength of 660-700Mpa and a tensile strength of 800-860Mpa. During the threading and screwing process of the pipe, the to...

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Abstract

The present invention discloses a thermal treatment method for a high-grade steel casing pipe with reasonable deep processing properties. The method is characterized in that the method includes the following process steps: a, Steel pipe material distribution. Misaligned material distribution is carried out by means of steel pipe misalignment; b, Quenching furnace heating. The temperature of the heating section is 960 plus or minus 10 DEG C, the temperature of the soaking section is 910 plus or minus 10 DEG C, and the moisture retention period of time is 50 minutes; c, Water quenching. The external eruption flow rate is greater than or equal to 3000m3 / h, the internal eruption flow rate is greater than or equal to 1000m3 / h, the water quenching period of time is greater than or equal to 30 minutes, and an internal nozzle is 130mm long; and d, Tempering furnace heating. The temperature of the heating section is 695 plus or minus 5 DEG C, the temperature of the soaking section is 695 plus or minus 5 DEG C, and the moisture retention period of time is 45 minutes. The thermal treatment method can control the mechanical properties of a high-grade steel casing pipe to be within a proper deep processing range, so that a screwdriver experiences less abrasion during the threading of the steel pipe, both the thread quality and the thread screwing quality are good, and the qualification rate for the first inspection is high.

Description

Technical field: [0001] The invention relates to the technical field of heat treatment of high-grade steel casings, in particular to a heat treatment method for high-grade steel casings with reasonable deep processing performance. Background technique: [0002] At present, the performance requirements of high-grade steel casing standards for steel pipes are relatively wide, and the performance of pipes treated by conventional heat treatment processes is uneven. For example, the standard mechanical performance requirements for a high-grade 3Cr casing are: yield The strength is 552-758Mpa, the tensile strength is greater than 689Mpa, and the performance requirements are relatively wide. After the performance and surface quality of the steel pipe are qualified, the thread processing and screwing process of the casing must be carried out. The mechanical properties of the pipe are too high or too low. In the process of thread processing and screwing, thread cutter wear or steel s...

Claims

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Application Information

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IPC IPC(8): C21D9/08C21D1/18
Inventor 刘丽丽王玲娟吴松王光朋
Owner 烟台宝钢钢管有限责任公司
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