Steel pipe and preparation method and application thereof
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A manufacturing method and technology for steel pipes, applied in the field of steel pipe manufacturing, can solve the problem that steel pipes cannot meet high strength, high toughness, SSC resistance and MIC resistance at the same time.
Active Publication Date: 2020-12-11
HENGYANG VALIN STEEL TUBE +1
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[0003] The main purpose of this application is to provide a steel pipe, its preparation method and application, so as to solve the problem that the steel pipe prepared by the existing method cannot meet the characteristics of high strength, high toughness, SSC resistance and MIC resistance at the same time
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Embodiment 1
[0044] In terms of weight percentage, the chemical composition of oil well pipe is: C 0.12%, Si 0.22%, Mn 0.55%, Cu0.97%, Al0.35%, Ce 0.15%, Cr 1.02%, Mo 0.83%, Nb 0.002%, V 0.21%, Ti 0.001%, N 0.003%, S 0.001%, P 0.002%, O 0.002%, Ca 0.005%, and the balance is Fe; the sum of the weight percentages of elements Cu, Al and Ce is 1.47 %.
[0045] The manufacturing method of the oil well pipe of the present application is as follows:
[0046] (1) The raw materials are mixed according to the chemical composition described in this application, and the oil pipe steel is smelted through the smelting methods of electric furnace and out-of-furnace refining. The oxygen content (O) and the sulfur content (S) are both not greater than 0.005wt%, and then the Ce element is added, Stir evenly and cast to obtain a steel ingot with a diameter of 220mm;
[0047] (2) The steel ingot is electroslag remelted, cast into a steel ingot with a diameter of 220mm, and the chemical composition of the st...
Embodiment 2
[0056] The difference with embodiment 1 is:
[0057] In terms of weight percentage, the chemical composition of oil well pipe is: C 0.15%, Si 0.23%, Mn 0.56%, Cu0.98%, Al0.45%, Ce 0.15%, Cr 1.03%, Mo 0.85%, Nb 0.003%, V 0.005%, Ti0.002%, N 0.004%, S 0.001%, P 0.002%, O 0.003%, B 0.001%, and the balance is Fe; among them, the sum of the weight percentages of Cu, Al and Ce is 1.58%.
Embodiment 3
[0059] The difference with embodiment 1 is:
[0060] In terms of weight percentage, the chemical composition of the oil well pipe is: C 0.14%, Si 0.24%, Mn 0.59%, Cu1.19%, Al0.25%, Ce 0.15%, Cr 1.01%, Mo 0.82%, V 0.13%, N 0.004%, S 0.001%, P 0.002%, O 0.003%, B 0.001%, and the balance is Fe; wherein, the sum of the weight percentages of Cu, Al and Ce is 1.59%.
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Abstract
The invention provides a steel pipe and a preparation method and application thereof. The preparation method comprises the steps that raw materials are obtained through burdening according to the following chemical components, specifically, the raw materials comprise, by weight, 0.08-0.30% of C, less than or equal to 0.5% of Si, less than or equal to 1.0% of Mn, 0.5-2.0% of Cu, less than or equalto 1.0% of Al, 0.01-0.2% of Ce, 0.5-1.5% of Cr, 0.5-1.5% of Mo, less than or equal to 0.3% of V, less than or equal to 0.005% of N, less than or equal to 0.005% of O, less than or equal to 0.005% of S, less than or equal to 0.005% of P and the balance Fe; and the raw materials are sequentially subjected to smelting, pouring, electroslag remelting, rolling and heat treatment, the steel pipe is obtained, and when the content of O and the content of S in a reaction product system are not larger than 0.005wt%, Ce is added. The steel pipe prepared through the method has the advantages of being highin strength and toughness, resistant to sulfide stress corrosion and microbial corrosion and the like, and structural function integration is achieved.
Description
technical field [0001] The present application relates to the field of steel pipe manufacturing, in particular, to a steel pipe, its preparation method and application. Background technique [0002] With the deepening of wells and the harshness of corrosive environments, oil and gas well pipes should have high strength and high corrosion resistance. Steel pipes exposed to H 2 In the acidic environment of S, hydrogen brittle fractures from sulfide stress corrosion cracking (SSC) will occur, and the higher the strength of the steel, the easier it is to cause SSC. In addition, in recent years, oil and gas pipeline breakage accidents caused by microbial corrosion (MIC) have occurred frequently, causing huge economic losses to the oil and gas industry. The pitting corrosion caused by MIC is also the crack source of SSC cracking, and the two corrosions promote each other, which brings great challenges to corrosion protection. Therefore, the oil and gas field industry is eager t...
Claims
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Application Information
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