A kind of duplex stainless steel seamless steel pipe for ethylene oxide reactor

A technology of duplex stainless steel and ethylene oxide, which is applied in the field of alloy steel, can solve the problems that cannot meet the requirements of steel pipe surface quality, material properties, mechanical properties and pitting corrosion resistance, and achieve the improvement of physical and mechanical properties. Performance, increase stability, avoid precipitation effect

Active Publication Date: 2015-11-18
JIANGSU YINHUAN PRECISION STEEL TUBE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although the existing duplex stainless steel seamless steel pipes have good properties, they still cannot meet the requirements of steel pipes for ethylene oxide reactors on surface quality, material properties, mechanical properties and pitting corrosion resistance, and there is no A steel pipe specially used for ethylene oxide reactor

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The present embodiment provides a duplex stainless steel seamless steel pipe for an ethylene oxide reactor. The mass percentages of its components are: C: 0.03%, Si: 0.5%, Mn: 1.8%, Ni: 4.5%, Cr: 22%, Cu: 2.1%, N: 0.14%, Mo: 3%, Al: 0.15%, Ru: 0.15%, Ti: 0.75%, lanthanide rare earth: 5%, and the balance is Fe; the lanthanide rare earth The mass percentages of the components are: lanthanum: 37%, cerium: 10%, samarium: 26%, neodymium: 7%, europium: 15%, and other lanthanides: 5%.

[0029] The manufacturing process of duplex stainless steel seamless steel pipe for ethylene oxide reactor is carried out according to the following steps:

[0030] (1) The composition and content of the intermediate billet tube shall be cold-rolled to the required outer diameter and wall thickness of the raw material tube through cold rolling equipment, the outer diameter error of the tube is ±0.45mm, and the wall thickness error is ±0.2mm;

[0031] (2) The intermediate blank tube obtained in ...

Embodiment 2

[0038]A duplex stainless steel seamless steel pipe for an ethylene oxide reactor provided in this example, the mass percent of its components is: C: 0.045%, Si: 0.4%, Mn: 1.5%, Ni: 6.5%, Cr: 21%, Cu: 2.3%, N: 0.17%, Mo: 2.5%, Al: 0.18%, Ru: 0.2%, Ti: 0.65%, lanthanide rare earth: 5.3%, the balance is Fe; the lanthanide rare earth The mass percentage of components is: lanthanum: 39%, cerium: 8%, samarium: 26%, neodymium: 8%, europium: 16%, and other lanthanide elements: 3%.

[0039] The manufacturing process of duplex stainless steel seamless steel pipes for ethylene oxide reactors is carried out in the following steps:

[0040] (1) The components and contents meet the requirements of raw material tubes to be cold-rolled to the required outer diameter and wall thickness of the intermediate billet tube through cold rolling equipment, the error of the outer diameter of the tube is ±0.45mm, and the error of the wall thickness is ±0.2mm;

[0041] (2) The intermediate billet tube o...

Embodiment 3

[0048] A duplex stainless steel seamless steel pipe for an ethylene oxide reactor provided in this example, the mass percent of its components is: C: 0.038%, Si: 0.35%, Mn: 2%, Ni: 5.5%, Cr: 23%, Cu: 2.4%, N: 0.2%, Mo: 3.5%, Al: 0.17%, Ru: 0.1%, Ti: 0.55%, lanthanide rare earth: 5.5%, the balance is Fe; the lanthanide rare earth The mass percentage of components is: lanthanum: 38%, cerium: 9%, samarium: 27%, neodymium: 9%, europium: 13%, and other lanthanide elements: 4%.

[0049] The manufacturing process of duplex stainless steel seamless steel pipes for ethylene oxide reactors is carried out in the following steps:

[0050] (1) The components and contents meet the requirements of raw material tubes to be cold-rolled to the required outer diameter and wall thickness of the intermediate billet tube through cold rolling equipment, the error of the outer diameter of the tube is ±0.45mm, and the error of the wall thickness is ±0.2mm;

[0051] (2) The intermediate billet tube ob...

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Abstract

The invention discloses a two-phase seamless stainless steel tube for an ethylene oxide reactor. The two-phase seamless stainless steel tube comprises the following components in percentage by mass: 0.03-0.045 percent of C, 0.35-0.5 percent of Si, 1.5-2 percent of Mn, 4.5-6.5 percent of Ni, 21-23 percent of Cr, 2.1-2.4 percent of Cu, 0.14-0.2 percent of N, 2.5-3.5 percent of Mo, 0.15-0.18 percent of Al, 0.1-0.2 percent of Ru, 0.55-0.75 percent of Ti, 5-5.5 percent of lanthanum rare earth and the balance of Fe. The two-phase seamless stainless steel tube has the characteristics that the electric corrosion rate is smaller than or equal to 10mdd; the mechanical performance is good; the pitting resistance equivalent is greater than 35. The two-phase seamless stainless steel tube is high in dimensional accuracy.

Description

Technical field [0001] The invention belongs to the technical field of alloy steel and relates to a seamless steel pipe and a manufacturing method thereof, in particular to a duplex stainless steel seamless steel pipe for an ethylene oxide reactor. Background technique [0002] Ethylene oxide is widely used in washing, pharmaceutical, printing and dyeing and other industries. However, due to its explosive nature, its reactor requirements are also very high. Due to the complex structure and extremely high technical and safety requirements of the ethylene oxide reactor, the requirements for the supporting pipes are very strict in terms of materials, processes, mechanical properties, and internal and external surfaces. [0003] Duplex stainless steel seamless steel pipe Duplex steel began industrial production and application in 1930. After more than 70 years of development and improvement, it has now developed into the third generation of duplex stainless steel represented by...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/58C21D9/08
Inventor 庄建新
Owner JIANGSU YINHUAN PRECISION STEEL TUBE CO LTD
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