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Manufacturing method of submarine oil well valve base

A technology for subsea oil wells and manufacturing methods, which is applied to wellbore/well valve devices, earthwork drilling, wellbore/well parts, etc., and can solve the problem of small friction coefficient of chrome plating layer, low hardness of chrome plating layer, and easy fall off of chrome plating layer and other problems, to achieve good dispersion and coverage, to avoid quenching stress concentration cracks, to improve the effect of density and continuity

Active Publication Date: 2014-03-05
镇江市华阳机电制造有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The friction coefficient of the chrome-plated layer is small, especially the dry friction coefficient, which is the lowest among all metals, so the chrome-plated layer has good wear resistance. Falling off, the hardness of the chrome plating layer is not high

Method used

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Effect test

Embodiment 1

[0025] This embodiment provides a method for manufacturing a subsea oil well valve seat provided by the present invention. The chromium-molybdenum low-alloy steel is selected as the blank, and the component content of the chromium-molybdenum low-alloy steel includes the following components in mass percentages: carbon: 0.3%, Silicon: 0.18%, Manganese: 0.50%, Chromium: 0.90%, Molybdenum: 0.20%, Phosphorus: 0%, Sulfur: 0%, Hydrogen: 0ppm, Nickel: 0%, Vanadium: 0%, Copper: 0%, 0 % residual element, all the other are Fe, specifically comprise the following steps:

[0026] Step (1): Heat the billet to 880°C, upset the billet along the axial direction, air cool to 360°C and keep it warm for 420 minutes;

[0027] Step (2): reheat the billet in step (1) to 870°C, repeatedly upsetting along the two mutually perpendicular diameter directions of the cross section of the billet, and air-cool to 290°C for 180 minutes;

[0028] Step (3): Heat the billet in step (3) to 585°C, pull out the f...

Embodiment 2

[0037] This embodiment provides a method for manufacturing a subsea oil well valve seat. Chromium-molybdenum low-alloy steel is selected as the blank, and the component content of the chromium-molybdenum low-alloy steel includes the following components in mass percentages: carbon: 0.32%, silicon: 0.36% %, manganese: 0.70%, chromium: 1.10%, molybdenum: 0.30%, phosphorus: 0.02%, sulfur: 0.025%, hydrogen: 1.8ppm, nickel: 0.40%, vanadium: 0.03%, copper: 0.30%, 0.9% residual element, and the rest are Fe, which specifically includes the following steps:

[0038] Step (1): Heating the billet to 920°C, upsetting the billet in the axial direction, air cooling to 360°C and keeping it warm for 420 minutes;

[0039] Step (2): reheat the billet in step (1) to 890°C, repeatedly upsetting along the two mutually perpendicular diameter directions of the cross section of the billet, and air-cool to 310°C for 180 minutes;

[0040] Step (3): Heat the billet in step (3) to 615°C, pull out the fo...

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Abstract

The invention discloses a manufacturing method of a submarine oil well valve base. Chrome-molybdenum low-alloy steel is selected as a blank. The chrome-molybdenum low-alloy steel comprises the following components in percentage by mass: 0.3-0.32% of carbon, 0.18-0.36% of silicon, 0.50-0.70% of manganese, 0.90-1.10% of chrome, 0.20-0.30% of molybdenum, 0-0.02% of phosphorus, 0-0.025% of sulfur, 0-1.8ppm of hydrogen, 0-0.40% of nickel, 0-0.03% of vanadium, 0-0.30% of copper, 0-0.9% residual element and the balance of Fe. The manufacturing method disclosed by the invention can enhance the pressure resistance and toughness of the valve base and prevent the chrome coating from shedding.

Description

technical field [0001] The invention relates to a manufacturing method of a subsea oil well valve seat. Background technique [0002] Deep sea oil production has extremely strict requirements on the environment, because the rich mud, H 2 S and CO 2 Gas, and the working pressure is 35MPa~69MPa or even higher, and the temperature can reach minus 50 degrees Celsius. Although the AISI4130 (MOD) material is used, the deep-sea valve seat manufactured by the conventional forging manufacturing process is not only difficult to satisfy the process and quality, Low-temperature toughness is also difficult to meet, and it cannot be applied to harsh environments. [0003] Chromium is a kind of silver-white metal with microstrip blue, relative atomic mass is 51.99, density is 6.98-7.21g / cm3, melting point is 1875-1920℃, metal chromium is easily passivated in the air, and the surface forms An extremely thin passivation film, which exhibits the properties of noble metals. The chromium pl...

Claims

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Application Information

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IPC IPC(8): C22C38/22C22C38/24C22C38/44C22C38/46C21D8/00C25D3/06E21B34/00
Inventor 陈雨民
Owner 镇江市华阳机电制造有限公司
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