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Steel tube with low temperature resistance and high strength and production method thereof

A production method and high-strength technology, applied in the direction of temperature control, etc., can solve the problems of low strength of seamless steel pipes, poor low-temperature weather resistance of seamless steel pipes, etc.

Inactive Publication Date: 2010-05-19
崔永贵
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Problems solved by technology

[0003] The purpose of the present invention is to provide a low temperature resistant high strength steel pipe and its production method, which solves 20 # Seamless steel pipe has low strength, 16Mn20 # Seamless steel pipes have problems such as poor low temperature weather resistance

Method used

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Embodiment

[0011] 1. The basic metallurgical process is EAF white slag + LFV vacuum degassing

[0012] 1) EAF white residue:

[0013] Furnace materials are made of low S, P machine steel, cut ends and high-quality pig iron; alloys need to prepare low-carbon chromium, low-carbon manganese, molybdenum iron, aluminum ingots, etc.; the reducing agent uses calcium carbide 2-3kg / t, and the amount of carbon powder must be burnt through. , Deoxidation of aluminum powder to keep white slag; decarburization amount ≥ 0.30%, slag amount [C] ≤ 0.04%, but not overoxidation; slag temperature ≥ 1650 ° C with low carbon Fe-Mn to adjust Mn: slag [C] , [P], T℃ meet the requirements and adjust Mn to 0.30%; net boiling time ≥ 5 minutes; insert Al0.8kg / t after slag removal, must use iron rod to insert molten steel; add alloy to the specified range according to the analysis results Inside; tapping temperature 1650±10°C; Al mixed to 0.75%, aluminum ingots are added to the ladle along with the steel flow.

[0...

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Abstract

The invention discloses a steel tube with low temperature resistance and high strength and a production method thereof. The steel tube comprises the following alloy components in percentage by weight: C, 0.16-0.20; Si 0.40-0.50; Mn, 1.40-1.60; V, 0.02-0.15; Nb, 0.02-0.06; Ti, 0.02-0.025; Cr, not more than 0.20; Ni, not more than 0.20; P, not more than 0.025; S, not more than 0.015; Mo, not more than 0.10; and the balance of Fe. The components are used as raw materials and subject to steel bloom, perforation, tube rolling and hot sizing to obtain sulphur-resistant oil well pipes, wherein the heating temperature in the perforation working procedure is 1,100-1,300 DEG C and the heating time is 55 minutes; and in the hot sizing working procedure, steel tubes the steel outlet temperature of which is above 800 DEG C are ensured to be subject to air cooling. The invention solves the problems that No. 20 seamless steel tubes have low strength and 16Mn No.20 seamless steel tubes have low low-temperature and poor weather resistance.

Description

technical field [0001] The invention relates to a petroleum steel pipe and a production method thereof, in particular to a low-temperature resistant high-strength steel pipe and a production method thereof. Background technique [0002] With the development of a large number of oil and gas fields in western my country, the construction of the pipeline network of the West-East Gas Transmission is becoming more and more dense, and the requirements for pipelines are also constantly increasing. While the domestic original 20 # Seamless steel pipe has low strength, 16Mn20 # Seamless steel pipes have problems such as poor low temperature weather resistance. Contents of the invention [0003] The purpose of the present invention is to provide a low temperature resistant high strength steel pipe and its production method, which solves 20 # Seamless steel pipe has low strength, 16Mn20 # Seamless steel pipes have problems such as poor low temperature weather resistance. [0004...

Claims

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Application Information

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IPC IPC(8): C22C38/58C22C38/50C22C38/38C22C38/28C22C38/14C21D8/10B21C37/06B21B37/74
Inventor 崔永贵
Owner 崔永贵
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