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Stainless steel tube applied to high-parameter ultra-supercritical thermal power generating unit and manufacturing process thereof

A technology of ultra-supercritical and thermal power units, applied in the field of stainless steel pipes and their manufacturing processes, can solve the problems of low tensile strength and high yield strength, high surface roughness, which restrict the competitiveness of electric thermal power units, etc., and achieve yield strength And the effect of high tensile strength and good oxidation resistance

Active Publication Date: 2013-05-29
WUXI XINCHANG STEEL PIPE
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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 electric thermal power units, and even affect the healthy development of the entire industry
[0004] In the prior art, due to the unreasonable composition and process, the stainless steel tubes used in thermal power units have poor oxidation resistance, low tensile strength and high yield strength, and high surface roughness

Method used

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  • Stainless steel tube applied to high-parameter ultra-supercritical thermal power generating unit and manufacturing process thereof
  • Stainless steel tube applied to high-parameter ultra-supercritical thermal power generating unit and manufacturing process thereof
  • Stainless steel tube applied to high-parameter ultra-supercritical thermal power generating unit and manufacturing process thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The high-parameter stainless steel pipe for ultra-supercritical thermal power units in this embodiment has the following mass percentages of components: C: 0.05%, Si: 1.0%, Mn: 1.0%, Ni: 29.0%, Cr: 16.0%, Nb: 0.35%, Cu: 0.02%, N: 0.03%, Mo: 1.5%, Al: 2.8%, lanthanide rare earth: 3%, the balance is Fe; the component mass percentage of the lanthanide rare earth is: La: 16 %, Ce: 26%, Pr: 20%, Nd: 20%, Dy: 15%, and other lanthanides: 3%.

[0027] The manufacturing process of the stainless steel tube for the high-parameter ultra-supercritical thermal power unit of this embodiment is carried out according to the following steps:

[0028] (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;

[0029] (2) Carry out heat treatment ...

Embodiment 2

[0035] The high-parameter stainless steel pipe for ultra-supercritical thermal power units of this embodiment has the mass percentages of its components: C: 0.10%, Si: 0.9%, Mn: 0.8%, Ni: 32.0%, Cr: 17.0%, Nb: 0.45%, Cu: 0.03%, N: 0.02%, Mo: 2.0%, Al: 3.0%, lanthanide rare earth: 5%, the balance is Fe; the component mass percentage of described lanthanide rare earth is: La: 20 %, Ce: 25%, Pr: 25%, Nd: 15%, Dy: 13%, and other lanthanides: 2%.

[0036] The manufacturing process of the stainless steel tube for the high-parameter ultra-supercritical thermal power unit of this embodiment is carried out according to the following steps:

[0037] (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;

[0038] (2) Carry out heat treatment ...

Embodiment 3

[0044] The high-parameter stainless steel pipe for ultra-supercritical thermal power units of this embodiment is characterized in that: the mass percentage of its components is: C: 0.08%, Si: 0.8%, Mn: 1.5%, Ni: 30.0%, Cr: 15.0 %, Nb: 0.40%, Cu: 0.03%, N: 0.01%, Mo: 2.5%, Al: 2.5%, lanthanide rare earth: 4%, and the balance is Fe; the component mass percent of the lanthanide rare earth is : La: 19%, Ce: 22%, Pr: 24%, Nd: 19%, Dy: 10%, and other lanthanide elements: 6%.

[0045] The manufacturing process of the stainless steel tube for the high-parameter ultra-supercritical thermal power unit of this embodiment is carried out according to the following steps:

[0046] (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;

[0047](2...

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Abstract

The invention relates to a stainless steel tube and a manufacturing process thereof, and relates to a stainless steel tube applied to a high-parameter ultra-supercritical thermal power generating unit, and a manufacturing process of the stainless steel tube. The stainless steel tube comprises the following ingredients in percent by mass: 0.05-0.1% of C, 0.85-1% of Si, 0.8-1.5% of Mn, 29-32% of Ni, 15-17% of Cr, 0.35-0.45% of Nb, 0.02-0.03% of Cu, 0.01-0.03% of N, 1.5-2.5% of Mo, 2.5-3% of Al, 3-5% of lanthanide series rare earth and the balance of Fe. Through setup of the ingredients and process parameters, in particular the addition of an appropriate amount of a lanthanide series rare earth element, and a bright heat-treatment procedure using a pure hydrogen protecting gas, the stainless steel tube applied to the thermal power generating unit is outstanding in oxidation resistance and is high in inner and outer surface roughness, yield strength, extension strength and the like.

Description

technical field [0001] The invention relates to a stainless steel tube and a manufacturing process thereof, in particular to a stainless steel tube for a high-parameter ultra-supercritical thermal power unit and a manufacturing process thereof. Background technique [0002] Large-capacity, high-parameter ultra-supercritical thermal power generation units can improve coal combustion efficiency and reduce environmental pollution, which is the current development direction of thermal power generation units in the world. The latest plan in 2011 shows that during the 12th Five-Year Plan period in my country, the steam parameters of ultra-supercritical units will break through to 650°C / 650°C, and will reach 700°C by 2020, and the new installed capacity will be 400 million kilowatts in 2020. With the improvement of the parameters of the thermal power unit, the requirements for the pipes used in the unit also increase accordingly. Moreover, the shape of steel pipe products is compl...

Claims

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Application Information

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IPC IPC(8): C22C38/48C21D8/10C22C30/02
Inventor 郁宇新
Owner WUXI XINCHANG STEEL PIPE
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