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U-shaped seamless nickel-chromium iron alloy heat transfer tube for nuclear steam generator

A steam generator, seamless nickel-chromium technology, applied in the field of seamless tube heat transfer tubes and their manufacturing, can solve the problems of restricting the development scale and speed of the nuclear power industry, high product prices, long delivery times, etc. Chromium depletion phenomenon, improved stress resistance and intergranular corrosion resistance, long length effect

Inactive Publication Date: 2013-06-12
BAOYIN SPECIAL STEEL TUBE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Before realizing localization, only three companies in the world, Valinox in France, Sumitomo in Japan, and Sandvik in Sweden, could produce the products. The products are expensive and have a long delivery time. The 690U heat transfer tubes used in domestic nuclear power plant steam generators are 100% dependent on imports. Restricted the development scale and speed of my country's nuclear power industry

Method used

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  • U-shaped seamless nickel-chromium iron alloy heat transfer tube for nuclear steam generator
  • U-shaped seamless nickel-chromium iron alloy heat transfer tube for nuclear steam generator
  • U-shaped seamless nickel-chromium iron alloy heat transfer tube for nuclear steam generator

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] This embodiment provides a U-shaped seamless nickel-chromium-iron alloy heat transfer tube for a nuclear power steam generator, and the process is as follows figure 1 shown, proceed as follows:

[0035] (1) Preparation of the raw material pipe, the chemical composition and mass percentage of the raw material pipe are: Ni: 58%, Cr: 31%, Fe: 9%, C: 0.01-0.03%, 0<Si≤0.5%, 0<Mn≤0.5 %, 0<S≤0.01%, 0<P≤0.015%, 0<Cu≤0.05%, 0<Co≤0.016%, 0<Ti≤0.5%, 0<Al≤0.5%, 0<Nb≤0.1% , 0<B≤0.003%, 0<N≤0.05%, the sum of the above components is 100%;

[0036](2) The raw material tube is cold-rolled to an intermediate tube with an outer diameter of 28 mm and a wall thickness of 2.5 mm through cold rolling equipment. The intermediate tube is first degreased and cleaned, and then subjected to a protective atmosphere bright heat treatment, and then straightened successively after the protective atmosphere bright heat treatment and surface grinding treatment; the protective atmosphere uses pure hydr...

Embodiment 2

[0044] This embodiment provides a U-shaped seamless nickel-chromium-iron alloy heat transfer tube for a nuclear power steam generator, and the process is as follows figure 1 shown, proceed as follows:

[0045] (1) Preparation of the raw material pipe, the chemical composition and mass percentage of the raw material pipe are: Ni: 62%, Cr: 28%, Fe: 8%, C: 0.01-0.03%, 0<Si≤0.5%, 0<Mn≤0.5 %, 0<S≤0.01%, 0<P≤0.015%, 0<Cu≤0.05%, 0<Co≤0.016%, 0<Ti≤0.5%, 0<Al≤0.5%, 0<Nb≤0.1% , 0<B≤0.003%, 0<N≤0.05%, the sum of the above components is 100%;

[0046] (2) The raw material tube is cold-rolled to an intermediate tube with an outer diameter of 32 mm and a wall thickness of 3.0 mm through cold rolling equipment. The intermediate tube is first degreased and cleaned, and then subjected to a protective atmosphere bright heat treatment, and then straightened successively after the protective atmosphere bright heat treatment and surface grinding treatment; the protective atmosphere uses pure hyd...

Embodiment 3

[0054] This embodiment provides a U-shaped seamless nickel-chromium-iron alloy heat transfer tube for a nuclear power steam generator, and the process is as follows figure 1 shown, proceed as follows:

[0055] (1) Preparation of the raw material pipe, the chemical composition and mass percentage of the raw material pipe are: Ni: 59%, Cr: 29%, Fe: 11%, C: 0.01-0.03%, 0<Si≤0.5%, 0<Mn≤0.5 %, 0<S≤0.01%, 0<P≤0.015%, 0<Cu≤0.05%, 0<Co≤0.016%, 0<Ti≤0.5%, 0<Al≤0.5%, 0<Nb≤0.1% , 0<B≤0.003%, 0<N≤0.05%, the sum of the above components is 100%;

[0056] (2) The raw material pipe is cold-rolled to an intermediate pipe with an outer diameter of 38mm and a wall thickness of 3.5mm by cold rolling equipment. The intermediate pipe is first degreased and cleaned, and then subjected to bright heat treatment in a protective atmosphere, and then straightened successively after the bright heat treatment in a protective atmosphere and surface grinding treatment; the protective atmosphere uses pure h...

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Abstract

The invention discloses a U-shaped seamless nickel-chromium iron alloy heat transfer tube for a nuclear steam generator. The U-shaped seamless nickel-chromium iron alloy heat transfer tube comprises the chemical ingredients of no less than 58% of Ni, 28-31% of Cr, 8-11% of Fe, 0.01-0.03% of C, no more than 0.5% of Si, no more than 0.5% of Mn, no more than 0.01% of S, no more than 0.015% of P, no more than 0.05% of Cu, no more than 0.016% of Co, no more than 0.5% of Ti, no more than 0.5% of Al, no more than 0.1% of Nb, no more than 0.003% of B, and no more than 0.005% of N. The surface quality and the dimensional accuracy of a straight pipe are ensured by hot-extruded nickel-chromium-iron alloy tube blank via a plurality of cold-rolling deformation, online degreasing, pure-hydrogen protecting continuous bright heat treatment and vacuum heat treatment; and meanwhile, the U-shaped seamless tube for a steam generator, which is overlong, thin in wall, and is in semicircle transition at the elbow part, is manufactured by bending and forming by the principle of forming a circle by three points.

Description

technical field [0001] The invention relates to a seamless heat transfer tube and a manufacturing method thereof, in particular to a U-shaped seamless nickel-chromium-iron alloy heat transfer tube for a nuclear power steam generator, a manufacturing method thereof, and a packaging method for the heat transfer tube. Background technique [0002] As an efficient, clean and environmentally friendly energy source, nuclear power generation has been widely used around the world. At present, more than 450 nuclear power plants have been connected to the grid for power generation, with a total installed capacity of 350 million kilowatts, accounting for 17% of the world's total power generation. , and as resources such as oil and coal become more and more scarce, the proportion of nuclear power generation in the total power generation is showing an obvious upward trend. Nuclear power generation will become a new force in the future power industry, and my country's nuclear power industry...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C19/05B21C37/15
Inventor 朱海涛邓莉汤国振彭志达
Owner BAOYIN SPECIAL STEEL TUBE CO LTD
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