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Precise stainless steel tube for nuclear power unit, and its making technology

A technology for nuclear power units and stainless steel pipes, which is applied in the field of precision stainless steel pipes for nuclear power units and its manufacturing process. It can solve the problems of low tensile strength and high yield strength, high surface roughness, and high cost, and achieve excellent corrosion resistance. , Good anti-corrosion performance, guarantee the effect of anti-corrosion performance

Active Publication Date: 2013-04-24
JIANGSU YINHUAN PRECISION STEEL TUBE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Expensive raw materials and supporting import costs will greatly restrict the competitiveness of my country's nuclear power units, and even affect the healthy development of the entire industry
[0004] In the prior art, due to unreasonable composition and process, precision stainless steel tubes for nuclear power units have low corrosion resistance, low tensile strength and high yield strength, and high surface roughness

Method used

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  • Precise stainless steel tube for nuclear power unit, and its making technology

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The precision stainless steel pipe for nuclear power unit of this embodiment has the mass percentage of its components: C: 0.04%, Si: 0.3%, Mn: 1.0%, Ni: 14.0%, Cr: 15.0%, Nb: 0.2%, Cu : 2.5%, N: 0.18%, Mo: 0.15%, Al: 0.2%, lanthanide rare earth: 6%, the balance is Fe; the mass percentage of lanthanide rare earth is: La: 35%, Ce: 15% , Sm: 20%, Nd: 13%, Gd: 12%, and other lanthanides: 5%.

[0025] The manufacturing process of the precision stainless steel tube for the nuclear power unit of the present embodiment is carried out in the following steps:

[0026] (1) The intermediate blank tube whose composition and content meet the required raw material tube is cold-rolled to the required tube outer diameter and wall thickness through cold rolling equipment, the error of the outer diameter of the tube is ±0.50mm, and the error of the wall thickness is ±0.25mm;

[0027] (2) Carry out heat treatment to the intermediate billet tube obtained in step (1), the temperature is 89...

Embodiment 2

[0033] The precision stainless steel tube for nuclear power unit of this embodiment has the mass percentages of its components: C: 0.04%, Si: 0.15%, Mn: 0.8%, Ni: 13.0%, Cr: 17.0%, Nb: 0.4%, Cu : 3.5%, N: 0.15%, Mo: 0.25%, Al: 0.3%, lanthanide rare earth: 8%, the balance is Fe; the mass percentage of lanthanide rare earth is: La: 40%, Ce: 12% , Sm: 25%, Nd: 11%, Gd: 10%, and other lanthanides: 2%.

[0034] The manufacturing process of the precision stainless steel tube for the nuclear power unit of the present embodiment is carried out in the following steps:

[0035] (1) The intermediate blank tube whose composition and content meet the required raw material tube is cold-rolled to the required tube outer diameter and wall thickness through cold rolling equipment, the error of the outer diameter of the tube is ±0.50mm, and the error of the wall thickness is ±0.25mm;

[0036] (2) Carry out heat treatment to the intermediate billet tube obtained in step (1), the temperature is ...

Embodiment 3

[0042] The precision stainless steel tube for nuclear power unit of this embodiment has the mass percentages of its components: C: 0.05%, Si: 0.25%, Mn: 0.9%, Ni: 15.0%, Cr: 16.0%, Nb: 0.3%, Cu : 3.0%, N: 0.20%, Mo: 0.20%, Al: 0.2%, lanthanide rare earth: 7%, the balance is Fe; the mass percentage of lanthanide rare earth is: La: 39%, Ce: 14% , Sm: 24%, Nd: 10%, Gd: 5%, and other lanthanides: 8%.

[0043] The manufacturing process of the precision stainless steel tube for the nuclear power unit of the present embodiment is carried out in the following steps:

[0044] (1) The intermediate blank tube whose composition and content meet the required raw material tube is cold-rolled to the required tube outer diameter and wall thickness through cold rolling equipment, the error of the outer diameter of the tube is ±0.50mm, and the error of the wall thickness is ±0.25mm;

[0045] (2) Carry out heat treatment to the intermediate billet tube obtained in step (1), the temperature is 9...

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Abstract

The invention relates to a stainless steel tube and its making technology, and concretely relates to a precise stainless steel tube for a nuclear power unit, and its making technology. The precise stainless steel tube comprises the following components, by mass, 0.04-0.05% of C, 0.15-0.3% of Si, 0.8-1% of Mn, 13-15% of Ni, 15-17% of Cr, 0.2-0.4% of Nb, 2.5-3.5% of Cu, 0.15-0.2% of N, 0.15-0.25% of Mo, 0.2-0.3% of Al, 6-8% of lanthanide rare earth, and the balance Fe. The limitation of the components and technological parameters, the addition of proper amounts of lanthanide rare earth elements, and the pure hydrogen protection gas bright-heat treatment operation make the stainless steel tube have a good corrosion resistance, and simultaneously the internal surface roughness, the external surface roughness, the yield strength, the tensile strength and the like of the precise stainless steel tube for a nuclear power unit are high.

Description

technical field [0001] The invention relates to a stainless steel tube and its manufacturing process, in particular to a precision stainless steel tube for nuclear power units and its manufacturing process. Background technique [0002] Nuclear power is an important direction of world energy development and a major basic project involving the lifeline of national economic development. China currently has 15 nuclear power units, while the world has a total of 441 nuclear power units in operation; China's total installed capacity of nuclear power accounts for about 1.2% of the country's total installed capacity, while the global average of nuclear power installed capacity is 17%. According to the statistics of relevant international organizations, due to the dual pressure of energy and environment, coupled with the technological progress of nuclear power in the world, the whole world will set off a climax of nuclear power construction. In March 2006, the State Council passed ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/48C21D8/10
Inventor 庄建新王国建
Owner JIANGSU YINHUAN PRECISION STEEL TUBE CO LTD
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