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Nickel-chromium-tungsten-series high-temperature alloy seamless tube for 700-DEG C ultra-supercritical boiler and manufacturing method for nickel-chromium-tungsten-series high-temperature alloy seamless tube

An ultra-supercritical boiler and high-temperature alloy technology, applied in the field of nickel-chromium-tungsten high-temperature alloy seamless pipes, can solve the problem of no corresponding reference experience in hot processing and cold processing, difficulty in controlling smelting components and element segregation, and affecting 700 °C Problems such as the industrial production process of materials for ultra-supercritical boilers, to achieve the effect of good surface quality, small size deviation, good structure and stability of strength

Active Publication Date: 2018-08-31
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] In the existing technology, it is difficult to control the smelting composition and element segregation, and there is no corresponding reference experience for hot processing and cold processing, which affects the industrial production process of materials for 700°C ultra-supercritical boilers

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A nickel-chromium-tungsten series high-temperature alloy seamless pipe for a 700°C ultra-supercritical boiler in this embodiment has the following weight percentages of main components: C: 0.08%, Si: 0.35%, Mn: 0.49%, P: 0.005% , S: 0.002%, Cr: 22.20%, Co: 0.06%, Al: 0.36%, Mo: 1.31%, Fe: 0.27%, W: 13.86%, B: 0.006%, La: 0.03%, Ni: 60.85% , Also contains V: 0.018%, Cu: 0.003%, Ti: 0.05%, Nb: 0.019% and other trace elements.

[0027] The manufacturing method of the nickel-chromium-tungsten superalloy seamless pipe for the 700°C ultra-supercritical boiler of the present embodiment comprises the following steps:

[0028] (1) The alloy is smelted by vacuum induction, cast into a Ф325×2800mm ingot, and then electroslag remelted into a Ф430mm ingot, and subjected to a homogenization heat treatment at 1200℃×24h. Such soaking treatment can reduce the degree of segregation of alloying elements.

[0029] (2) The steel ingot obtained in step (1) is opened into a 320 octagonal bi...

Embodiment 2

[0041] A nickel-chromium-tungsten series high-temperature alloy seamless pipe for a 700°C ultra-supercritical boiler in this embodiment has the following weight percentages of main components: C: 0.09%, Si: 0.36%, Mn: 0.47%, P: 0.004% , S: 0.001%, Cr: 22.18%, Co: 0.05%, Al: 0.35%, Mo: 1.33%, Fe: 0.28%, W: 13.88%, B: 0.005%, La: 0.03%, Ni: 60.84% , also contains V: 0.018%, Cu: 0.004%, Ti: 0.05%, Nb: 0.018%, La: 0.03% and other trace elements.

[0042] The manufacturing method of the nickel-chromium-tungsten superalloy seamless pipe for the 700°C ultra-supercritical boiler of the present embodiment comprises the following steps:

[0043] (1) The alloy is smelted by vacuum induction, cast into a Ф325×2800mm ingot, and then electroslag remelted into a Ф430mm ingot, and subjected to a homogenization heat treatment at 1200℃×24h. Such soaking treatment can reduce the degree of segregation of alloying elements.

[0044] (2) The steel ingot obtained in step (1) is opened into a 320mm...

Embodiment 3

[0055] A nickel-chromium-tungsten series high-temperature alloy seamless pipe for a 700°C ultra-supercritical boiler in this embodiment has the following weight percentages of main components: C: 0.09%, Si: 0.36%, Mn: 0.48%, P: 0.005% , S: 0.002%, Cr: 22.06%, Co: 0.05%, Al: 0.35%, Mo: 1.32%, Fe: 0.27%, W: 13.85%, B: 0.006%, La: 0.03%, Ni: 60.97% , also contains V: 0.018%, Cu: 0.004%, Ti: 0.05%, Nb: 0.019% and other trace elements.

[0056] The manufacturing method of the nickel-chromium-tungsten superalloy seamless pipe for the 700°C ultra-supercritical boiler of the present embodiment comprises the following steps:

[0057] (1) The alloy is smelted by vacuum induction, cast into a Ф325×2800mm ingot, and then electroslag remelted into a Ф430mm ingot, and subjected to a homogenization heat treatment at 1200℃×24h. Such soaking treatment can reduce the degree of segregation of alloying elements.

[0058] (2) The steel ingot obtained in step (1) is opened into a 320 octagonal bi...

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Abstract

The invention relates to a nickel-chromium-tungsten-series high-temperature alloy seamless tube for a 700-DEG C ultra-supercritical boiler. The nickel-chromium-tungsten-series high-temperature alloy seamless tube comprises the following components in percentage by weight: 0.06-0.10% of C, 0.25-0.50% of Si, 0.30-0.50% of Mn, less than or equal to 0.03% of P, less than or equal to 0.010% of S, 22.00%-23.00% of Cr, less than or equal to 1.0% of Co, less than or equal to 0.5% of Al, 1.00-2.00% of Mo, less than or equal to 1.0% of Fe, 13.5-14.5% of W, less than or equal to 0.015% of B, 0.01-0.05% of La and the balance of Ni and trace elements. According to the nickel-chromium-tungsten-series high-temperature alloy seamless tube disclosed by the invention, components are controlled, parameters are limited, and a certain amount of elements such as W, Mo and La is added, and a manufacturing method adopts a vacuum induction and electroslag re-melting smelting process, a hot-extrusion and cold-rolling process, and the like, so that the nickel-chromium-tungsten-series high-temperature alloy seamless tube has very good high-temperature strength and corrosion resistance as well as very good stability of a long-term aged structure and strength, and the structure and the performances completely meet use requirements of a tube for the 700-DEG C ultra-supercritical boiler.

Description

technical field [0001] The invention relates to a nickel-chromium-tungsten high-temperature alloy seamless pipe, in particular to a high-temperature alloy seamless pipe used for a 700°C ultra-supercritical boiler. Background technique [0002] my country is currently the world's largest coal producer and consumer, as well as the world's largest CO2 emitter. In response to climate change, my country is now facing enormous pressure to reduce CO2 emissions, and coal-fired thermal power is the largest and most concentrated source of CO2 emissions in my country. There are three possible technical approaches for reducing CO2 emissions in coal-fired thermal power plants: carbon capture and storage technology, coal-biomass co-combustion technology, and improving the efficiency of thermal power units. The way is to improve the efficiency of thermal power units. The main way to improve the efficiency of thermal power units is to improve steam parameters and develop supercritical and ...

Claims

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Application Information

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IPC IPC(8): C22C19/05C22F1/10C23G1/10
CPCC22C19/055C22F1/10C23G1/10
Inventor 高佩吴青松丛生达曾凡博黄程耀
Owner JIANGSU YINHUAN PRECISION STEEL TUBE CO LTD
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