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Alloy steel, seamless steel pipe, manufacturing method thereof and well drilling water separating pipe

A technology of seamless steel pipe and manufacturing method, which is applied in earthwork drilling, drilling equipment, underwater drilling, etc., and can solve problems such as inability to meet the production demand of drilling risers

Inactive Publication Date: 2019-03-12
HENGYANG VALIN STEEL TUBE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The main purpose of the present invention is to provide an alloy steel, a seamless steel pipe and its manufacturing method, and a drilling riser to solve the problem that the alloy steel material in the prior art cannot meet the production requirements of the drilling riser

Method used

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  • Alloy steel, seamless steel pipe, manufacturing method thereof and well drilling water separating pipe
  • Alloy steel, seamless steel pipe, manufacturing method thereof and well drilling water separating pipe
  • Alloy steel, seamless steel pipe, manufacturing method thereof and well drilling water separating pipe

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] An alloy steel in Embodiment 1, calculated by weight percentage, the alloy steel includes: Fe, C, Si, Mn, Cr, Mo, Ni, Nb, P, S and Al. Among them, the content of each component is: 0.06%≤C≤0.12%, 0.20%≤Si≤0.50%, 1.30%≤Mn≤1.60%, 0.10%≤Cr≤0.50%, 0.10%≤Mo≤0.50, 0.15% ≤Ni≤0.30%, 0.01%≤Nb≤0.05%, 0.010%≤Al≤0.040%, P≤0.015%, S≤0.003%.

Embodiment 2

[0068] The manufacturing method of the seamless steel pipe of the second embodiment, wherein the difference between the second embodiment and the first embodiment is:

[0069] (1) Smelting of blanks

[0070] Add molten iron at a ratio of 500kg / t and scrap steel produced in the production of marine pipes at a ratio of 500kg / t as raw materials, smelt in a 45-ton electric furnace, refine in a 45-ton refining furnace, and add 2.5kg / t of silicon during the smelting process Iron, 17kg / t low-carbon ferromanganese, 2.0kg / t ferro-vanadium, 11kg / t micro-carbon ferrochromium, 9kg / t ferromolybdenum, and a small amount of aluminum wire and ferro-titanium, the above raw materials are used in a 45-ton vacuum degassing furnace process Carry out vacuum smelting of molten steel; then use round billet arc continuous casting machine for continuous casting; in the above process, control the refining furnace ladle hanging ladle molten steel temperature = liquidus temperature + (70 ~ 90) ± 10 ° C; t...

Embodiment 3

[0098] The manufacturing method of the seamless steel pipe of the third embodiment, wherein the difference between the third embodiment and the second embodiment is:

[0099] According to the ratio of 500kg / t to add molten iron and 500kg / t to add scrap steel produced by the production of marine pipe varieties, as raw materials, after smelting in a 45-ton electric furnace and refining in a 45-ton refining furnace, and adding 2.5kg / t during the smelting process Ferrosilicon, 17kg / t low-carbon ferromanganese, 2.0kg / t ferro-vanadium, 11kg / t micro-carbon ferrochrome, 9kg / t ferromolybdenum, and a small amount of aluminum wire and ferro-titanium, the above raw materials are used in a 45-ton vacuum degassing furnace The vacuum smelting of molten steel is carried out in the process; then the round billet arc continuous casting machine is used for continuous casting; Package baking for 3.5 hours, the baking temperature is above 1100°C; the casting speed is controlled at 0.610m / min; the ...

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Abstract

The invention provides alloy steel, a seamless steel pipe, a manufacturing method thereof and a well drilling water separating pipe. The alloy steel comprises components including Fe, C, Si, Mn, Cr, Mo, Ni, Nb, P, S and Al; and according to weight percentage, the C is larger than or equal to 0.06% and smaller than or equal to 0.12%, the Si is larger than or equal to 0.20% and smaller than or equalto 0.50%, the Mn is larger than or equal to 1.30% and smaller than or equal to 1.60%, the Cr is larger than or equal to 0.10% and smaller than or equal to 0.50%, the Mo is larger than or equal to 0.10% and smaller than or equal to 0.50%, the Ni is larger than or equal to 0.15% and smaller than or equal to 0.30%, the Nb is larger than or equal to 0.01% and smaller than or equal to 0.05%, the Al islarger than or equal to 0.010% and smaller than or equal to 0.040%, the P is smaller than or equal to 0.015%, and the S is smaller than or equal to 0.003%. By means of the technical scheme, the problem that an alloy steel material in the prior art cannot meet the production requirement of the well drilling water separating pipe is effectively solved.

Description

technical field [0001] The invention relates to the technical field of pipeline production and processing, in particular to an alloy steel, a seamless steel pipe and a manufacturing method thereof, and a drilling riser. Background technique [0002] With the continuous exploitation of onshore oil and natural gas resources, oil and gas exploration and development are expanding towards the sea, and offshore oil and gas exploration and development must use drilling risers. [0003] The offshore drilling riser is an important tool for offshore oil exploration and development. It is an important part connecting the offshore platform or drilling ship with the subsea wellhead. It mainly plays the role of isolating seawater and supporting various control pipelines. It is the key to the safety of the entire offshore drilling system. key link. The service conditions of the offshore drilling riser are harsh, and it needs to withstand complex and variable stresses and loads such as ver...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/48C22C33/04B21C37/06C21D8/10E21B17/00E21B7/12
Inventor 黄电源田研谢凯意王建华卓钊周正平昝启飞郭胜
Owner HENGYANG VALIN STEEL TUBE
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