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Steel forging manufacturing process for deep-sea Christmas tree equipment connectors

A deep-sea Christmas tree and manufacturing process technology, applied in metal processing equipment and other directions, to achieve the effect of eliminating tissue defects

Active Publication Date: 2011-05-25
NANJING DEV ADVANCED MFG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For structural parts such as Christmas tree connectors with special strength levels and low-temperature toughness requirements, the conventional design materials are high-nickel or high-chromium-molybdenum alloy steel, but the welding performance of connector forgings made of high-nickel or high-chromium-molybdenum alloy steel is difficult to meet For this reason, various manufacturers try to use low-alloy high-strength steel to replace high-nickel or high-chromium-molybdenum alloy steel to manufacture structural parts such as Christmas tree connectors, so we chose chromium-nickel-molybdenum low-alloy steel F65 MOD material ( The total content of alloy elements in the steel is less than 5%, which is called low-alloy steel), and the carbon equivalent (CE) of this material is 0.43-0.46. Compared with conventional high-nickel or high-chromium-molybdenum alloy steel, it not only significantly improves the welding performance , and the material price is only 62% of the price of high-nickel or high-chromium-molybdenum alloy steel materials for conventional design
However, if the F65 MOD material is selected, the low-temperature toughness of the Christmas tree equipment connector manufactured through the conventional forging manufacturing process cannot meet the requirements, and it cannot be applied to low-temperature working conditions such as deep sea

Method used

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  • Steel forging manufacturing process for deep-sea Christmas tree equipment connectors
  • Steel forging manufacturing process for deep-sea Christmas tree equipment connectors
  • Steel forging manufacturing process for deep-sea Christmas tree equipment connectors

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0081] Embodiment (process number D), concrete steps are as follows:

[0082] Step D①: Using chromium-nickel-molybdenum low-alloy steel as a blank, the chromium-nickel-molybdenum low-alloy steel blank is smelted by the process of primary smelting in an electric furnace, refining outside the furnace, and vacuum degassing. The chromium-nickel-molybdenum low-alloy steel is made of carbon, Composition of silicon, manganese, chromium, nickel, molybdenum, phosphorus, sulfur, hydrogen, niobium, vanadium and boron, its mass percentage is:

[0083] 0.10%≤carbon≤0.12%, 0.30%≤silicon≤0.35%, 1.00%≤manganese≤1.40%, 0.10%≤chromium≤0.25%, 0.50%≤nickel≤1.00%,

[0084] 0.15%≤molybdenum≤0.40%, 0≤phosphorus≤0.015%, 0≤sulfur≤0.010%, 0≤hydrogen≤2.0ppm, 0≤niobium≤0.04%, 0≤vanadium≤0.04%,

[0085] 0≤boron≤0.0005%, and, 0.43%≤carbon equivalent CE≤0.46%, carbon equivalent CE=C+Mn / 6+(Cr+Mo+V) / 5+(Ni+Cu) / 15,

[0086] Step D②: Select the square ingot according to the size of the required structural part...

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Abstract

The invention relates to a steel forging manufacturing process for deep-sea Christmas tree equipment connectors, which comprises the following steps: (1) using chromium-nickel-molybdenum low-alloy steel as the blank material; (2) selecting square ingots, heating to 1220 DEG C, cogging, pulling out the material, sawing, and taking the middle section as the blank; (3) heating to the initial forging temperature, upsetting in the directions of three-dimensional coordinates, and drawing out to obtain the isotropic blank; (4) upsetting and forging the blank to obtain an octagonal prism, punching, circularly rolling and shaping to obtain a cylindrical forging stock with a hole; (5) carrying out rough machining on the cylindrical forging stock with a hole to obtain a cylindrical workpiece with a hole; (6) heating the cylindrical workpiece with a hole to 940 DEG C, and cooling in the air to room temperature; (7) heating the cylindrical workpiece with a hole subjected to the step (6), to 930 DEG C, and quenching with water; and (8) heating the cylindrical workpiece with a hole subjected to the step (7), to 640 DEG C, and cooling in the air to room temperature.

Description

Technical field: [0001] The invention belongs to a manufacturing process of a steel forging used for a deep-sea oil tree equipment connector, and the manufacturing process is a combination of a forging process and a heat treatment process. Background technique: [0002] A Christmas tree is an assembly of various valves and fittings used for fluid control in oil and gas wells and provides access to production tubing strings. Oil and gas wellhead pressure is high, flow rate is high, and leakage is easy at the same time, oil and gas contain H- 2 S, CO 2 and other corrosive media, so there are stricter requirements on the sealing performance and material of the Christmas tree. For the sake of safety, for some high-pressure and ultra-high-pressure oil and gas wells, especially the Christmas tree components of deep-sea oil and gas wells are integrally forged with high-quality steel. The connector is one of the important components of the Christmas tree. The connector is locat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/54C22C38/44C22C38/48C22C38/46C21D1/28C21D1/25B21J5/08
Inventor 张利
Owner NANJING DEV ADVANCED MFG
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