A pipe joint and its preparation method

A technology of pipe joints and weight percentages, which is applied in the field of pipe joints and its preparation, can solve problems such as harsh deep-sea environments, and achieve the effects of improving strength and plasticity, improving corrosion resistance, and improving low-temperature impact resistance

Active Publication Date: 2021-06-15
YANTAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Because the pipe joints have strict requirements on the purity, compactness and compositional uniformity of 30CrNiMo, especially in the harsh deep sea environment, deep sea oil production puts forward strict requirements on the strength, low temperature impact performance and corrosion resistance of large diameter pipe joints , the existing 30CrNiMo forged pipe joints cannot meet the needs of users, resulting in the use of deep-sea oil production pipe joints must rely on imports, so there is an urgent need for a pipe joint and its preparation method to meet user needs

Method used

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  • A pipe joint and its preparation method
  • A pipe joint and its preparation method
  • A pipe joint and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A pipe joint, its chemical composition and weight percentage are: carbon 0.27%, manganese 0.66%, phosphorus ≤ 0.020%, sulfur ≤ 0.015%, silicon 0.13%, nickel 0.72%, chromium 0.81%, molybdenum 0.33%, aluminum 0.01% , niobium 0.015%, vanadium 0.03%, copper ≤ 0.15%, the balance is iron and unavoidable impurities. The total amount of copper, niobium, aluminum, vanadium and unavoidable impurities is less than or equal to 1.00%. The unavoidable impurities include nitrogen, oxygen, and hydrogen, wherein nitrogen≤100ppm, oxygen≤30ppm, and hydrogen≤1.6ppm.

[0034] The preparation method of the above-mentioned pipe joint comprises the following steps:

[0035] (1) Smelting, using electric furnace smelting, ladle furnace refining, vacuum casting, vacuum degassing and electroslag remelting;

[0036] (2) Forging; 10,000 tons of hydraulic press is used for free forging, the initial forging temperature is 1250°C, the final forging temperature is 750°C, and the forging ratio is 5; the...

Embodiment 2

[0040]A pipe joint, its chemical composition and weight percentage are: carbon 0.34%, manganese 1.09%, phosphorus ≤ 0.020%, sulfur ≤ 0.015%, silicon 0.37%, nickel 0.93%, chromium 1.09%, molybdenum 0.47%, aluminum 0.031% , niobium 0.035%, vanadium 0.06%, copper ≤ 0.15%, the balance is iron and unavoidable impurities. The total amount of copper, niobium, aluminum, vanadium and unavoidable impurities is less than or equal to 1.00%. The unavoidable impurities include nitrogen, oxygen, and hydrogen, wherein nitrogen≤100ppm, oxygen≤30ppm, and hydrogen≤1.6ppm.

[0041] The preparation method of the above-mentioned pipe joint comprises the following steps:

[0042] (1) Smelting, using electric furnace smelting, ladle furnace refining, vacuum casting, vacuum degassing and electroslag remelting;

[0043] (2) Forging: 10,000-ton hydraulic press is used for free forging, the initial forging temperature is 1200°C, the final forging temperature is 800°C, and the forging ratio is 5; the fir...

Embodiment 3

[0047] A pipe joint, its chemical composition and weight percentage are: carbon 0.30%, manganese 0.88%, phosphorus ≤ 0.020%, sulfur ≤ 0.015%, silicon 0.23%, nickel 0.80%, chromium 0.90%, molybdenum 0.40%, aluminum 0.020% , niobium 0.022%, vanadium 0.04%, copper ≤ 0.15%, the balance is iron and unavoidable impurities. The total amount of copper, niobium, aluminum, vanadium and unavoidable impurities is less than or equal to 1.00%. The unavoidable impurities include nitrogen, oxygen, and hydrogen, wherein nitrogen≤100ppm, oxygen≤30ppm, and hydrogen≤1.6ppm.

[0048] The preparation method of the above-mentioned pipe joint comprises the following steps:

[0049] (1) Smelting, using electric furnace smelting, ladle furnace refining, vacuum casting, vacuum degassing and electroslag remelting;

[0050] (2) Forging; 10,000 tons of hydraulic press is used for free forging, the initial forging temperature is 1250°C, the final forging temperature is 750°C, and the forging ratio is 5; th...

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Abstract

The invention discloses a pipe joint, whose chemical composition and weight percentage are: carbon 0.27-0.34%, manganese 0.66-1.09%, phosphorus ≤ 0.020%, sulfur ≤ 0.015%, silicon 0.13-0.37%, nickel 0.72-0.93% , chromium 0.81-1.09%, molybdenum 0.33-0.47%, aluminum 0.01-0.031%, niobium 0.015-0.035%, vanadium 0.03-0.06%, copper ≤ 0.15%, and the balance is iron and unavoidable impurities. In the present invention, by rationally controlling the dosage of each component, each component synergizes and promotes each other, improves the strength and plasticity of the material, and improves the low-temperature impact resistance of the forging; adopts the post-forging heat treatment process and the heat treatment of quenching and tempering of the present invention process, refining the precipitation strengthening phase, improving the corrosion resistance of steel, and further improving the low temperature impact resistance of forgings.

Description

technical field [0001] The invention relates to the technical field of production of oil and gas forgings, in particular to a pipe joint and a preparation method thereof. Background technique [0002] The current Christmas tree pipe joints are mainly forged with AISI8630 (30CrNiMo). 30CrNiMo is a typical quenched and tempered steel, which has high yield strength, tensile strength and fatigue strength, good plasticity and toughness, and good comprehensive performance. 30CrNiMo is widely used, mainly used in high-pressure chemical containers with high pressure and frequent fluctuations, and also used in pressure pipes, plastic molds, important components, etc. Because the pipe joints have strict requirements on the purity, compactness and compositional uniformity of 30CrNiMo, especially in the harsh deep sea environment, deep sea oil production puts forward strict requirements on the strength, low temperature impact performance and corrosion resistance of large diameter pipe ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/42C22C38/44C22C38/46C22C38/48C21D9/08C21D1/18C21D8/10B21J5/00
CPCB21J5/002C21D1/18C21D8/105C21D9/085C22C38/002C22C38/02C22C38/04C22C38/06C22C38/42C22C38/44C22C38/46C22C38/48
Inventor 张文彦李霞张尚洲朱礼龙张华陈淑英孟范超
Owner YANTAI UNIV
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