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A preparation method for high-strength plastic austenitic stainless steel cap screw forgings for nuclear power

An austenitic stainless steel, high-strength technology, applied in the direction of screws, threaded fasteners, connecting components, etc., can solve the problem that it is difficult to meet the high strength, high plasticity, corrosion resistance and high temperature stress relaxation resistance of cap screw forgings at the same time. Achieve the effect of improving solid solution strengthening effect, increasing strength and toughness, and improving high temperature stress relaxation resistance

Active Publication Date: 2018-01-23
沈阳科金特种材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to solve the problems existing in the prior art that it is difficult to simultaneously satisfy the high strength, high plasticity, corrosion resistance and high temperature stress relaxation resistance of cap screw forgings. A preparation method for plastic austenitic stainless steel cap screw forgings, so as to obtain high-strength plastic austenitic stainless steel cap screw forgings with excellent comprehensive performance, and realize its application in nuclear main pumps

Method used

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  • A preparation method for high-strength plastic austenitic stainless steel cap screw forgings for nuclear power
  • A preparation method for high-strength plastic austenitic stainless steel cap screw forgings for nuclear power
  • A preparation method for high-strength plastic austenitic stainless steel cap screw forgings for nuclear power

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The composition of the base metal electrode for electroslag is controlled at: Ni 12.20~12.60%, Cr 17.50~17.80%, Mo2.50~2.75%, Mn 1.50~1.80%, Si 0.30~0.50%, C 0.025~0.035%, Co≤ 0.05%, N0.04~0.06%, the balance of Fe. The electroslag electrode prepared in this example has the following components: Ni 12.46%, Cr 17.68%, Mo2.71%, Mn 1.76%, Si 0.34%, C 0.032%, Co≤0.016%, N 0.053%, Fe balance . During the electroslag process, the melting current is controlled at 9500-12000A, and the remelting voltage is controlled at 65-80V. In this example, the melting current is 10500A, the melting voltage is 72V, and the electroslag is formed into a Φ500mm electroslag ingot.

[0024] The electroslag steel ingot is heated to 1160°C in the furnace. After the holding time meets the requirements, it is out of the furnace for forging. The billet size of the first firing is 250mm square, and the forging ratio is 3. The second firing is from 250mm square to 86 square. The forging ratio is 8.6, a...

Embodiment 2

[0032] The prepared electrode for electroslag is composed of Ni 12.34%, Cr 17.53%, Mo 2.75%, Mn 1.66%, Si 0.40%, C 0.030%, Co≤0.018%, N 0.059%, and the balance is Fe. The slag smelting current is 10300A, the smelting voltage is 74V, and the electroslag is formed into a Φ500mm electroslag ingot.

[0033] The electroslag steel ingot is heated to 1155°C in the furnace. After the holding time meets the requirements, it is out of the furnace for forging. The blank size of the first firing is 250mm square, and the forging ratio is 3. The second firing is from 250mm square to 86 square. The forging ratio is 8.6, and the total forging ratio is greater than 10.

[0034] After the billet forging is completed, the billet is subjected to solution treatment at 1060°C for 4 hours and water-cooled to room temperature, and then the billet is machined. The size of the billet after machining reaches a square size of 73 mm.

[0035] After the machining is completed, the blank is subjected to cold...

Embodiment 3

[0041] The prepared electrode for electroslag is composed of Ni 12.53%, Cr 17.52%, Mo 2.60%, Mn 1.69%, Si 0.44%, C 0.029%, Co≤0.020%, N 0.058%, and the balance is Fe. The slag smelting current is 11200A, the smelting voltage is 75V, and the electroslag is formed into a Φ500mm electroslag ingot.

[0042] The electroslag steel ingot is heated to 1158°C in the furnace. After the holding time meets the requirements, it is taken out of the furnace for forging. The blank size of the first firing is 250mm square, and the forging ratio is 3. The second firing is from 250mm square to 86 square. The forging ratio is 8.6, and the total forging ratio is greater than 10.

[0043] After the billet forging is completed, the billet is subjected to solution treatment at 1070°C for 4 hours and water-cooled to room temperature, and then the billet is machined. The size of the billet after machining reaches a square size of 74mm.

[0044] After the machining is completed, the blank is subjected ...

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Abstract

Disclosed is a preparing method for a high-strength plastic austenitic stainless steel cap screw forging for nuclear power. The method comprises the following steps: firstly, smelting, wherein the composition of a base material electrode for ASME SA-479 316 material electroslag and the electroslag steel ingot size are controlled; secondly, forging, wherein the beginning forging temperature and the finish forging temperature of forging are controlled; thirdly, solid-solution treatment, wherein the solid-solution treatment condition and the temperature rise speed are controlled, and after solid-solution treatment is completed, a blank is subject to machining treatment; fourthly, cold-deformation treatment, wherein the size and deformation amount obtained after deformation are controlled; and fifthly, heat treatment is carried out, the heat treatment temperature, the heat preservation time and the temperature rise speed are controlled, and after heat treatment is completed, the cap screw forging delivery size is achieved through machining; and the tensile strength of the cap screw forging obtained through the method is above 699 MPa, and even reaches 751 MPa, the yield strength is above 509 MPa, the ductility is above 40%, the area reduction is above 65%, and the intergranular corrosion performance and the high-temperature stress relaxation resistance performance meet the requirements.

Description

technical field [0001] The invention relates to a method for preparing a stainless steel cap screw forging, in particular to a method for preparing a high-strength plastic austenitic stainless steel cap screw forging for nuclear power, and belongs to the technical field of metallurgy. Background technique [0002] CAP1400 refers to the advanced passive nuclear power technology with an installed capacity of 1.4 million kilowatts. It is the third-generation nuclear power technology with independent intellectual property rights clearly proposed in my country's "National Medium and Long-term Science and Technology Development Program Outline". The CAP1400 project aims to form a large-scale advanced pressurized water pump with independent intellectual property rights in my country, greater power, higher safety and longer life on the basis of the current AP1000 technology with better safety and economy, through digestion, absorption and re-innovation In order to get rid of the situ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23P15/00C22C38/58C22C38/52C22C38/02C22B9/18C21D8/00
CPCB23P15/00C21D8/00C22B9/18C22C38/001C22C38/02C22C38/52C22C38/58F16B35/00
Inventor 赵忠刚萨仁格日乐刘晓书栾威威王海棠张俊峰伦建伟栾晓宇
Owner 沈阳科金特种材料有限公司
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