Seamless steel tube for nuclear power and preparation method for seamless steel tube

A technology of seamless steel pipe and nuclear power, applied in the field of thick-walled seamless steel pipe for nuclear power and its preparation, to achieve the effects of reducing composition segregation, reducing band structure, and improving band structure

Active Publication Date: 2015-12-16
PANGANG GROUP CHENGDU STEEL & VANADIUM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In addition, since the RCC-M specification restricts the metallographic structure of P280GH steel pipes in the delivery state, requiring its metallographic structure to be ferrite + pearlite, the final heat treatment of P280GH steel pipes can generally only be normalized heat treatment, not In order to improve its impact performance, the method of quenching and tempering heat treatment is adopted

Method used

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  • Seamless steel tube for nuclear power and preparation method for seamless steel tube
  • Seamless steel tube for nuclear power and preparation method for seamless steel tube
  • Seamless steel tube for nuclear power and preparation method for seamless steel tube

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preparation example Construction

[0047] A method for preparing a seamless steel pipe for nuclear power of the present invention comprises the following steps:

[0048] a. Smelting and casting: using scrap steel and sponge iron as raw materials, smelting, tapping, and continuous casting to obtain continuous casting slabs;

[0049] The invention adopts high-quality scrap steel and sponge iron as raw materials, can be smelted in an ultra-high-power electric arc furnace, and steel is tapped from the eccentric bottom of the furnace to ensure that the steel and slag are retained, and the steel is tapped without slag;

[0050] b. Hot-rolled tube: heat the continuous casting slab obtained in step a to 1260-1280°C and keep it warm for 6-7 hours; out of the furnace, when the temperature drops to 1210-1230°C, perforate the tube blank; roll the tube after perforation , the final rolling temperature is 860~900℃;

[0051] According to the specifications of the finished steel pipe, the tube blank of the corresponding speci...

Embodiment 1

[0070] Production of Ф168.3×22 P280GH steel pipe

[0071] Smelting and casting:

[0072] Using high-quality steel scrap + sponge iron as raw materials, using ultra-high-power electric arc furnace for melting, and tapping from the eccentric furnace bottom to ensure that the steel and slag are retained, and the steel is tapped without slag;

[0073] When refining, the ladle furnace is used to blow argon and stir throughout the process, and the molten steel is treated with vacuum degassing and silicon-aluminum wire feeding to ensure the stability and purity of the molten steel composition;

[0074] Electromagnetic stirring and soft reduction measures are adopted during continuous casting to control the pouring of molten steel at low superheat to reduce the component segregation of the tube billet;

[0075] Through smelting and continuous casting, a continuous casting slab of Ф280 was obtained. The chemical composition of the slab is shown in Table 1.

[0076] Table 1 Chemical c...

Embodiment 2

[0102] Production of Ф457×37 P280GH steel pipe

[0103] Smelting and casting:

[0104] Using high-quality steel scrap + sponge iron as raw materials, using ultra-high-power electric arc furnace for melting, and tapping from the eccentric furnace bottom to ensure that the steel and slag are retained, and the steel is tapped without slag;

[0105] When refining, the ladle furnace is used to blow argon and stir throughout the process, and the molten steel is treated with vacuum degassing and silicon-aluminum wire feeding to ensure the stability and purity of the molten steel composition;

[0106] Electromagnetic stirring and soft reduction measures are adopted during continuous casting to control the pouring of molten steel at low superheat to reduce the component segregation of the tube billet;

[0107] Through smelting and continuous casting, a continuous casting slab of Ф620 was obtained. The chemical composition of the slab is shown in Table 4.

[0108] Table 4 Chemical com...

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Abstract

The invention relates to a seamless steel tube and a preparation method for the seamless steel tube, in particular to a thick-wall seamless steel tube for nuclear power and a preparation method for the tube. A steel blank of the seamless steel tube is composed of, by weight percent, 0.13%-0.15% of C, 0.15%-0.38% of Si, 0.80%-1.20% of Mn, not larger than 0.015% of P, not larger than 0.001% of S, not larger than 0.25% of Cr, not larger than 0.50% of Ni, not larger than 0.10% of Mo, not larger than 0.18% of Cu, 0.020%-0.050% of Al, not larger than 0.03% of Sn and the balance Fe. Composition segregation and a banded structure of the prepared P280GH thick-wall steel tube can be obviously relieved, and original austenite grains and ferrite crystal grains are refined, so that the transverse impact toughness and other mechanical properties of the tube are obviously improved, and a metallographic structure of the seamless steel tube also can meet the requirement of the RCC-M standard.

Description

technical field [0001] The invention relates to a seamless steel pipe and a preparation method thereof, in particular to a thick-walled seamless steel pipe for nuclear power and a preparation method thereof. Background technique [0002] P280GH is a carbon steel seamless steel pipe variety with high temperature characteristics stipulated in the French specification RCC-M "Code for Design and Construction of Pressurized Water Reactor Nuclear Island Mechanical Equipment". It is widely used in the main steam system and steam generator feed water of pressurized water reactor nuclear power plants. Flow control, auxiliary water supply system and steam turbine bypass system, etc. [0003] Due to its special use conditions and high safety level, the requirements for the structure and toughness of steel pipes are much higher than those for thermal power pipes. For example, the metallographic structure should be ferrite + pearlite, and the low-temperature impact energy at -20°C should...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/42C22C38/44C22C38/20C22C38/22C22C38/16C22C38/12C22C38/08C22C38/06C21D8/10
Inventor 陈雨郭元蓉胡铂余霓张先华
Owner PANGANG GROUP CHENGDU STEEL & VANADIUM
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