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Method for preparing rare earth-containing seamless steel tube for petroleum cracking

A seamless steel pipe, oil cracking technology, applied in the direction of pipes, rigid pipes, mechanical equipment, etc., can solve the problems of high compressive strength and corrosion resistance of pipelines, harsh operating conditions of cracking devices, and high concentration, and achieve low cost. , good promotion value, good economic effect

Inactive Publication Date: 2012-04-04
INNER MONGOLIA BAOTOU STEEL UNION
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, domestically exploited crude oil has the disadvantages of high concentration of wax and sulfur and high viscosity, which makes the conditions for cracking units used in oil production and transportation more stringent, and the requirements for the compressive strength and corrosion resistance of pipelines are higher

Method used

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  • Method for preparing rare earth-containing seamless steel tube for petroleum cracking
  • Method for preparing rare earth-containing seamless steel tube for petroleum cracking
  • Method for preparing rare earth-containing seamless steel tube for petroleum cracking

Examples

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Embodiment Construction

[0011] The smelting production process of steel is: molten iron→converter smelting→LF refining→VD degassing→round billet continuous casting. Converter smelting adopts desulfurized molten iron, deoxidation and alloying of silicomanganese, ferromanganese and ferrochrome alloys, and the whole process is blown with argon according to normal refining; The chemical composition of each example is shown in Table 1.

[0012] Each example composition of table 1 (mass percentage / %)

[0013]

[0014] The rolling process of seamless steel pipe is: round billet → sawing → heating → piercing → pipe rolling → tension reduction → sampling → cooling → cutting head and tail → straightening → inspection → packaging → weighing → storage. The temperature of the round billet is 1260-1280°C when it is pierced; the temperature when it is rolled is 1200-1220°C; Apply the Ф180MPM unit to roll the seamless steel pipe with the specification of Ф245mm×16mm.

[0015] The heat treatment process of roll...

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Abstract

The invention relates to a method for preparing a rare earth-containing seamless steel tube for petroleum cracking. The method is characterized in that: a steel material of the seamless steel tube comprises the following chemical ingredients in percentage by mass: 0.09 to 0.15 percent of C, 0.22 to 0.50 percent of Si, 0.31 to 0.60 percent of Mn, 4.00 to 6.00 percent of Cr, 0.45 to 0.65 percent of Mo, less than or equal to 0.02 percent of P, less than or equal to 0.02 percent of S, 0.002 to 0.005 percent of Re and the balance of Fe, wherein the total mass fraction of all the ingredients is 100 percent; continuous casting blank rounding punching temperature of the material is between 1,250 and 1,280 DEG C; the tube rolling temperature is between 1,180 and 1,220 DEG C; the sizing / stretch-reducing temperature is between 820 and 860 DEG C; a heat treatment process of normalizing and tempering is adopted, and the normalizing temperature is between 860 and 880 DEG C and is kept for 70 to 80 minutes; and the tempering temperature is between 730 and 750 DEG C and is kept for 90 to 100 minutes. The method has the advantages that: the prepared seamless steel tube has extremely high compression strength and corrosion resistance, and each performance meets the requirement of the seamless steel tube for the petroleum cracking under rigorous conditions.

Description

Technical field: [0001] The invention relates to a preparation method of a seamless steel pipe for petroleum cracking containing rare earth, belonging to the field of metallurgical materials. Background technique: [0002] With the development of the economy, the number of petroleum refining and chemical projects continues to increase, making the demand for corrosion-resistant cracking pipes used in petroleum refining and chemical equipment also continue to increase. The steel used for petroleum cracking seamless steel pipes should have good strength, toughness and mechanical properties. At present, the materials used to prepare seamless steel pipes for petroleum cracking are basically obtained by adding alloy elements such as Cr and Mo to low-carbon steel and adopting quenching and tempering treatment. The steel produced by this method can meet the requirements of general conditions. Requirements for seamless steel pipes for petroleum cracking. However, the domestically e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/22C21D8/10F16L9/02
Inventor 石晓霞刘金王金龙马爱清丰小东张行刚惠志国宋江波
Owner INNER MONGOLIA BAOTOU STEEL UNION
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