Tubular threaded fitting and lubricant film-forming composition used therefor

A technology for threaded joints and compositions, which is applied in lubricating compositions, threaded connections, pipes/pipe joints/fittings, etc., can solve the problems of washing away the coated grease, worrying about the harmfulness of the human body, and the adverse effects of the environment, etc. Rust generation, excellent seizure resistance, and airtightness ensuring effect

Active Publication Date: 2015-04-15
NIPPON STEEL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the threaded joint is connected, the applied grease may be washed away or spilled to the outside, especially due to harmful heavy metals such as lead, and cause adverse effects on the environment, especially marine life
In addition, the coating operation of compound grease deteriorates the operating environment and operating efficiency, and there are also concerns about its harmfulness to the human body.

Method used

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  • Tubular threaded fitting and lubricant film-forming composition used therefor
  • Tubular threaded fitting and lubricant film-forming composition used therefor
  • Tubular threaded fitting and lubricant film-forming composition used therefor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1、4、6 and comparative example 2～3

[0144] For pipe thread joints made of Cr-Mo steel of composition A shown in Table 1, a manganese phosphate coating (Rz: 12 μm) with a thickness of 15 μm was formed on the surface of the sleeve after grinding and finishing, followed by spraying at room temperature. A lubricating film having a film thickness of 50 μm having the compositions shown in each of the Examples and Comparative Examples in Table 3. On the surface of the pin, a zinc phosphate coating (Rz: 8 μm) with a thickness of 12 μm was formed after finishing by grinding, and then a lubricating coating was formed similarly to the surface of the sleeve.

Embodiment 2

[0146] For a threaded joint made of 13% Cr steel of composition B shown in Table 1, after grinding and finishing the surface of the sleeve, Ni strike plating was first applied by electroplating, followed by Cu plating with a thickness of 7 μm (total plating thickness is 8 μm). The Rz of the plating surface was 2 μm. On this plated film, a lubricating film having a film thickness of 50 μm having the composition shown in Example 2 in Table 3 was formed by room temperature spray coating. On the surface of the pin (Rz=2 μm), a lubricating film with a thickness of 50 μm was formed similarly to the surface of the sleeve.

Embodiment 3

[0148] For threaded joints made of 13% Cr steel of composition B shown in Table 1, after finishing by grinding and Ni strike plating by electroplating, a copper-tin-zinc alloy with a thickness of 7 μm was formed on the surface of the sleeve Plating film (Rz: 2 μm) (total coating thickness: 8 μm). On this plated film, a lubricating film having a thickness of 50 μm having the composition of Example 3 shown in Table 3 was formed. On the surface of the pin (Rz=2 μm), a lubricating film was formed similarly to the surface of the sleeve.

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Abstract

Provided is a composition for forming a lubricant film on a tubular threaded fitting, the composition being characterized by containing melamine cyanurate, a basic aromatic organic acid metal salt, and at least one species selected from: a pine resin-based material; wax; a metal soap; and a lubricating powder.

Description

technical field [0001] The invention relates to a tubular threaded joint for the connection of steel pipes, especially oil well pipes, and a surface treatment method thereof. [0002] This application claims priority based on Patent Application No. 2012-174117 for which it applied to Japan on August 6, 2012, The content is used here. Background technique [0003] Oil well pipes such as tubing and casing used in oil well drilling for excavation of crude oil and diesel oil are generally connected (connected) using tubular threaded joints. Conventionally, the depth of an oil well has been 2000 to 3000 m, but in recent years deep oil wells such as offshore oil fields have sometimes reached a depth of 8000 to 10000 m. The length of oil well pipes is typically more than ten meters, and multiple casings are used to surround the pipes in which fluids such as crude oil flow inside. Therefore, the number of oil well pipes connected by threaded joints will reach a huge number. [000...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10M163/00C10M125/02C10M125/18C10M129/40C10M133/42C10M159/02C10M159/04C10M159/24C10N10/04C10N30/00C10N40/00F16L15/04
CPCC10N2230/12C10M2207/125C10M2205/18C10M163/00C10M2207/126C10M2215/222C10N2230/06C10N2250/14C10M2201/041C10M169/044E21B17/042C10M2219/046C10M2203/1006C10N2280/00C10N2250/10C10M2205/16F16L58/182C10M2201/042C10M2205/163C10M2207/1253C10M2207/28C10M2207/2805C10M2209/10C10M2209/1003C10M2217/0403C10M169/04C10N2030/06C10N2030/12C10N2040/34C10N2050/023C10N2050/02C10N2080/00C10N2050/10C10N2010/04
Inventor 后藤邦夫田中雄二
Owner NIPPON STEEL CORP
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