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Seamless steel tube and preparation method of seamless steel tube

A technology for seamless steel pipes and tube blanks, which is applied in the field of steel pipe manufacturing, can solve the problem that seamless steel pipes cannot be applied to the needs of oil and gas field exploitation, and achieves the effects of improving tempering stability, increasing strength and toughness, and improving strength and toughness.

Inactive Publication Date: 2018-10-16
HENGYANG VALIN STEEL TUBE
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The main purpose of the present invention is to provide a seamless steel pipe and a preparation method of the seamless steel pipe to solve the problem that the seamless steel pipe in the prior art cannot be applied to the exploitation needs of oil and gas fields with high pressure, high temperature and severe corrosion environment

Method used

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  • Seamless steel tube and preparation method of seamless steel tube
  • Seamless steel tube and preparation method of seamless steel tube
  • Seamless steel tube and preparation method of seamless steel tube

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preparation example Construction

[0032] According to another aspect of the present invention, a kind of preparation method of steel pipe is provided, such as figure 1 As shown, it includes the following steps: S1, preparing raw materials according to the above-mentioned ratio of seamless steel pipes, and smelting the raw materials to obtain a billet; S2, rolling the billet to obtain a pipe billet; and S3, performing heat treatment on the pipe billet, Get seamless steel pipe.

[0033] The use of the above-mentioned raw materials can make the strength, toughness and hydrogen sulfide stress corrosion resistance of the seamless steel pipe meet the production requirements of oil and gas fields with high pressure, high temperature and severe corrosion environment.

[0034] In the above step S1, in order to further improve the hydrogen sulfide stress corrosion resistance of the material, the prepared raw materials include any one or more of molten iron, high-quality steel scrap, iron alloy and aluminum. Among them,...

Embodiment 1 to 19 and comparative example 1 to 6

[0043] Embodiments 1 to 19 and comparative examples 1 to 6 were prepared in the following way:

[0044] (1) Smelting of blanks

[0045] The scrap steel produced by adding molten iron and producing oil well pipe varieties is used as raw materials, smelted in a 45-ton electric furnace and refined in a 45-ton refining furnace, and ferrosilicon, low-carbon ferromanganese, ferro-vanadium, micro-carbon ferrochromium, and ferromolybdenum are added during the smelting process , and a small amount of aluminum wire and ferro-titanium, the above-mentioned raw materials are vacuum smelted with molten steel in a 45-ton vacuum degassing furnace; Molten steel temperature = liquidus temperature + (80 ~ 110) ± 10 ℃; tundish baking for 3 hours, the baking temperature is above 1100 ℃; the casting speed is controlled at 0.64m / min; the vibration frequency adjustment range of the crystallizer is 200opm , amplitude adjustment range ± 3mm, offset adjustment range 20%; crystallizer cooling water cont...

Embodiment 20

[0059] The difference from Example 1 is that in the arc continuous casting process, the casting speed is controlled at 0.2m / min; the mold vibration frequency is 160opm, the amplitude is ±1mm, and the offset adjustment range is 5%.

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Abstract

The invention provides a seamless steel tube and a preparation method of the seamless steel tube. Relative to the total weight of the seamless steel tube, the seamless steel tube is prepared from thefollowing components in percent by weight: 0.18-0.32% of C, 0.15-0.50% of Si, 0.35-0.65% of Mn, 0.40-0.85% of Cr, 0.50-1.00% of Mo, 0.05-0.15% of V, 0.01-0.05% of Al, less than 0.015% of P, less than0.003% of S and the balance Fe and inevitable impurities. By strictly controlling the chemical constituent contents of raw materials, the chemical components are reasonably proportioned, so that the strength, toughness and hydrogen sulfide stress corrosion resistance of the obtained seamless steel tube can meet the exploiting demands on high-pressure and high-temperature oil and gas fields in severe corrosive environments.

Description

technical field [0001] The invention relates to the technical field of steel pipe manufacturing, in particular to a seamless steel pipe and a method for preparing the seamless steel pipe. Background technique [0002] With the increasing demand for global oil and natural gas energy, the development of conventional oil and gas fields in the past can no longer meet the current market demand. Oil and gas exploration and development are expanding towards unconventional oil and gas resources in high pressure, high temperature and harsh corrosive environments. Facing the working environment with severe corrosive media such as hydrogen sulfide, the corrosion of oil and gas pipes used has attracted more and more attention. Therefore, higher corrosion resistance requirements have been put forward for oil and gas pipes. The national iron and steel development plan proposes to increase the exploration of oil and gas resources, and focus on the investigation and exploration of unconvent...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/22C22C38/24C22C38/06C21D8/10F16L9/02
CPCC21D8/105C22C38/02C22C38/04C22C38/06C22C38/22C22C38/24F16L9/02Y02P10/20
Inventor 黄电源田研谢凯意邹喜洋卓钊周正平昝启飞
Owner HENGYANG VALIN STEEL TUBE
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