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Production process of ultrahigh-strength large-wall-thickness underwater Christmas tree wellhead connector forge piece

An underwater Christmas tree and ultra-high-strength technology, applied in metal processing equipment and other directions, can solve problems such as underwater wellheads and Christmas trees that cannot be used to produce large wall thicknesses, and achieve improved equipment performance, increased service life, and high performance. The effect of material hardenability

Pending Publication Date: 2021-10-22
苏州雷格姆亨瑞能源装备工程有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the defect that the 8630 material cannot be used to produce large-wall-thick underwater wellheads and Christmas trees, the present invention provides a production process for ultra-high-strength large-wall-thickness underwater Christmas tree wellhead connector forgings. By adjusting the chemical composition of the material Ratio, improve the forging process, formulate a new heat treatment process to improve the performance of 8630 materials

Method used

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  • Production process of ultrahigh-strength large-wall-thickness underwater Christmas tree wellhead connector forge piece
  • Production process of ultrahigh-strength large-wall-thickness underwater Christmas tree wellhead connector forge piece

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Embodiment Construction

[0016] The technical solutions of the present invention will be further described below in combination with preferred embodiments.

[0017] The production process of the ultra-high-strength and large-wall-thick underwater Christmas tree wellhead connector forging according to the present invention is characterized in that: the production steps are as follows:

[0018] a. Cutting material: chemical composition and weight percentage: C: 0.25~0.33, Si: 0.1~0.4, Mn: 0.65~1.1, S≤0.01, P≤0.015, Cr: 0.6~1.1, Ni: 0.6~0.99 , Mo:0.3~0.5, Al≤0.03, Nb≤0.02, V≤0.06, Ti≤0.025, Sn≤0.015, Sb≤0.02, As≤0.02, Pb≤0.01, Bi≤0.01, B≤0.0005, N:≤ 0.012, H≤1.6ppm, O≤25ppm, CE(IIW)≥(Qualified CE-0.03) *see note The steel billet is used as the raw material; then the smelting process of EF+LF+VD bottom injection vacuum protection pouring is adopted

[0019] b. Forging: Put the billet into the forging furnace, heat the billet at a heating rate not higher than 110°C / h, first heat the billet to 850°C and k...

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Abstract

The invention discloses a production process of ultrahigh-strength large-wall-thickness underwater Christmas tree wellhead connector forge piece. The production process comprises the following production steps: discharging; forging; heat treatment after forging; quenching and tempering heat treatment; and nondestructive inspection and machining. The production process has the advantages that the performance of a 8630 material is improved by adjusting the chemical component proportion of the material, improving a forging process and formulating a new heat treatment process, so that the 8630 material has extremely high material hardenability when the ultrahigh-strength and large-wall-thickness underwater Christmas tree wellhead connector forge piece is produced; and the material design thickness exceeding the standard requirement is obtained, and the required comprehensive mechanical performance with the uniform total cross section is met, so that the equipment performance is improved, the service life is prolonged, and the use safety of the product is ensured.

Description

technical field [0001] The invention relates to a production process of an ultra-high-strength and large-wall-thick underwater Christmas tree wellhead connector forging. Background technique [0002] my country's deep-water oil and gas development is faced with harsh marine environments and terrain conditions such as internal waves and typhoons, and the seabed topography and engineering site conditions are complex; However, the deep water emergency rescue capability is still in a blank state. Therefore, it is necessary to combine independent innovation and international cooperation to innovate the technology development model of offshore oil engineering. And all of this requires high-performance materials as the basis. [0003] Subsea wellheads and Christmas trees are important unit equipment in the development of offshore oil and gas fields, and are also key equipment in subsea production systems. For a long time, underwater wellhead and Christmas tree equipment have been...

Claims

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Application Information

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IPC IPC(8): C21D1/25C21D1/78C21D6/00C21D8/00C22C38/02C22C38/04C22C38/06C22C38/44C22C38/46C22C38/48C22C38/50C22C38/54C22C38/60B21J5/00
CPCC21D1/78C21D1/25C21D6/004C21D6/005C21D6/008C21D8/005C22C38/02C22C38/04C22C38/06C22C38/44C22C38/48C22C38/46C22C38/50C22C38/008C22C38/60C22C38/002C22C38/54B21J5/00
Inventor 周勇葛辉
Owner 苏州雷格姆亨瑞能源装备工程有限公司