Martensitic stainless steel seamless steel tube for oil and gas exploitation and manufacturing method thereof

A martensitic stainless steel and seamless steel pipe technology, applied in the field of steel pipe manufacturing, can solve the problems of low strength, long delivery time and high price

Active Publication Date: 2015-10-21
SHANXI TAIGANG STAINLESS STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the strength of the traditional API series of martensitic stainless steel is low, and the yield strength is between 565-655 MPa. The super martensitic stainless steel produced by Sumitomo Corporation of Japan has a high price and a long delivery time.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Embodiment 1: the manufacture method of martensitic stainless steel seamless steel pipe:

[0039] The mass percentage of present embodiment steel component is:

[0040] C 0.26; Si 0.34; Mn 0.58; P 0.020; S 0.001; Cr 13.5; the rest is Fe and unavoidable trace impurities.

[0041] The target specification is Φ165×25×4000mm, which includes the following steps:

[0042] 1. Smelting

[0043] After the pretreated molten iron is smelted in the K-OBM-S converter and refined in the VOD furnace, the molten steel can be tapped if the mass percentage of the molten steel meets the following requirements:

[0044] C 0.26; Si 0.34; Mn 0.58; P 0.020; S 0.001; Cr 13.5; the rest is Fe and unavoidable trace impurities.

[0045] 2. Pouring billet

[0046] Adopt 8.4 tons of ingot moulds, above-mentioned molten steel mold is cast into square ingot, the steel billet of upper edge length 800mm, lower edge length 670mm, taper 13%.

[0047] 3. Hot rolled billet

[0048] a heating

[0...

Embodiment 2

[0061] Embodiment 2: the manufacture method of martensitic stainless steel seamless steel pipe:

[0062] The mass percentage of present embodiment steel component is:

[0063] C 0.46; Si 0.18; Mn 0.44; P 0.018; S 0.001; Cr 13.2; the rest is Fe and unavoidable trace impurities.

[0064] The target specification is Φ220×40×4000mm, which includes the following steps:

[0065] 1. Smelting

[0066] After the pretreated molten iron is smelted in an electric furnace and refined in an AOD furnace, the molten steel can be tapped when its composition mass percentage meets the following requirements:

[0067] C 0.46; Si 0.18; Mn 0.44; P 0.018; S 0.001; Cr 13.2; the rest is Fe and unavoidable trace impurities.

[0068] 2. Pouring billet

[0069] Adopt 8.4 tons of ingot moulds, above-mentioned molten steel mold is cast into square ingot, the steel billet of upper edge length 800mm, lower edge length 670mm, taper 13%.

[0070] 3. Hot rolled billet

[0071] a heating

[0072] The ...

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Abstract

The invention discloses a martensitic stainless steel seamless steel tube for oil and gas exploitation and a manufacturing method thereof. The seamless steel tube comprises, by weight, 0.20% to 0.60% of C, 0% to 1.00% of Si, 0% to 1.00% of Mn, 12.0% to 14.0% of Cr, 0% to 0.01% of S, 0% to 0.02% of P, 0% to 0.60% of Ni and the balance iron and unavoidable impurities. The manufacturing method includes the main steps that molten steel is smelted firstly according to chemical components, a billet is formed by the molten steel in a pouring mode and forged to be a solid circular tube blank, then the circular tube blank is extruded to be a seamless steel tube in the required specification, and the high-strength, high-tenacity and corrosion-resistant martensitic stainless steel seamless steel tube meeting the use requirement can be obtained after the tempering process and the follow-up finishing process.

Description

technical field [0001] The invention relates to a martensitic stainless steel seamless steel pipe for oil and gas development and a manufacturing method thereof, belonging to the technical field of steel pipe manufacturing. Background technique [0002] As the environment for oil and gas exploitation becomes harsher, the "three high" (high temperature, high pressure, and high corrosion) oil and gas wells are gradually increasing. Among them, the "three high" oil and gas wells whose corrosive environment is the combined action of carbon dioxide and chloride ions have a higher demand for materials. Strict, not only requires high strength, but also requires corrosion resistance. The use of plain carbon steel and alloy steel can no longer meet the requirements of use, and stainless steel and its corrosion-resistant alloys have been widely used in oil well pipes. Practice has proved that martensitic stainless steel can meet the requirements of high strength, high toughness and c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/18C22C38/40
Inventor 聂飞康喜唐刘宇拓雷锋李鹏付俊生张琳张晓侯楠梁祥祥
Owner SHANXI TAIGANG STAINLESS STEEL CO LTD
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