Alloy for high-temperature or ultrahigh-temperature gas cooled reactor steam generator and preparation method thereof

A high-temperature gas-cooled reactor and steam generator technology, applied in the field of Ni-Cr-Mo high-temperature alloy smelting and processing, to achieve the effects of saving energy consumption, reducing vacancies, and improving creep resistance

Inactive Publication Date: 2022-04-12
华能核能技术研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] To produce forgings or hot-rolled bar products that meet the design requirements of high-temperature gas-cooled reactors and ultra-high-temperature gas-cooled reactors, the room temperature performance of forgings or hot-rolled rod materials, transient performance at 950°C or above, durable performance at 950°C, and structural stability Strict requirements have been put forward for corrosion performance and so on. Ordinary austenitic stainless steel and nickel-based alloys can no longer meet the requirements for use.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Specifications are Preparation of large diameter ring forgings.

[0046] Ingot forging into middle ring billet

[0047] Melting out the following alloy ingots of chemical composition (percentage by weight):

[0048] C: 0.07%, P: 0.010%, S: 0.002%, Si: 0.20%, Mn: 0.20%, Cr: 22.0%, Ni: 48.1%, Cu: 0.20%, Mo: 9.0%, W: 0.7%, Al: 0.04%, Ti: 0.03%, Fe: 18.5%, Co: 0.85%, B: 0.002%, and the rest are unavoidable impurities.

[0049] In this embodiment, vacuum induction plus protective atmosphere electroslag remelting smelting process is used to cast into ingots;

[0050] Heating the ingot, using a fast forging press for forging deformation with a deformation amount of 43%, forging to a solid octagonal billet in the middle, and then performing multiple forging and hot processing on the billet;

[0051] Heat processed into an intermediate product of annular forging with an outer diameter of 1050mm and an inner diameter of 520mm, and then hot sent to a heating furnace for heati...

Embodiment 2

[0056] Specifications are Preparation of large diameter pipe fittings.

[0057] After the ingot is smelted, it is forged into an intermediate round tube billet

[0058] Melting out the following alloy ingots of chemical composition (percentage by weight):

[0059] C: 0.08%, P: 0.005%, S: 0.002%, Si: 0.02%, Mn: 0.20%, Cr: 21.6%, Ni: 47.5%, Cu: 0.20%, Mo: 9.0%, W: 0.7%, Al: 0.04%, Ti: 0.03%, Fe: 19.5%, Co: 0.87%, B: 0.002%, and the rest are unavoidable impurities.

[0060] After the ingot is heated and kept warm, a fast forging press is used for forging deformation with a deformation amount of 46%, forged to the middle octagonal specification, and then hot sent to a heating furnace for heating, and finally a radial forging machine is used to forge a black leather forging rod. The total deformation ratio of the main section should not be less than 6. After being air-cooled, the surface finish of the middle round tube blank should be Ra≤1.6μm.

[0061] Cut the polished middle...

Embodiment 3

[0068] Specifications are Preparation of hot forged bars

[0069] After the ingot is smelted, it is forged into a size of Middle black leather round billet forged steel bar

[0070] Melting out the following alloy ingots of chemical composition (percentage by weight):

[0071] C: 0.06%, P: 0.005%, S: 0.002%, Si: 0.02%, Mn: 0.18%, Cr: 21.7%, Ni: 47.6%, Cu: 0.20%, Mo: 8.9%, W: 0.7%, Al: 0.04%, Ti: 0.03%, Fe: 19.6%, Co: 0.87%, B: 0.002%, and the rest are unavoidable impurities.

[0072] Will The surface of the middle black leather round steel bar is folded, pitted, etc., and ground until the bright metal surface is exposed, and then forged by a radial forging machine to The indeterminate finished forging bar blank of black skin, and then the black skin of about 2mm on the inner and outer surfaces is removed by a machining vehicle, and the PT surface flaw detection is carried out;

[0073] For further removal of defects on the surface after PT flaw detection, it is proce...

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Abstract

The alloy comprises the following components in percentage by weight: 0.06 to 0.10 percent of C, less than or equal to 0.02 percent of P, less than or equal to 0.012 percent of S, 20.5 to 23.0 percent of Cr, more than or equal to 47.5 percent of Ni, 8.5 to 9.5 percent of Mo, 0.3 to 1.0 percent of W, less than or equal to 0.15 percent of Al, less than or equal to 0.10 percent of Ti, 17.0 to 20.0 percent of Fe, 0.001 to 0.002 percent of B, less than or equal to 1.40 percent of Co and the balance of inevitable impurities. By optimizing the alloy ratio, the structure uniformity of forgings and hot-rolled bars is greatly improved, and the requirements of high-temperature gas cooled reactors and ultrahigh-temperature gas cooled reactors for high comprehensive performance indexes of high-temperature materials are met.

Description

technical field [0001] The invention belongs to the technical field of Ni-Cr-Mo high-temperature alloy smelting and processing, and in particular relates to a high-temperature gas-cooled reactor, ultra-high-temperature gas-cooled reactor steam generator high-temperature alloy and a forging and a hot-rolled bar manufacturing process. Background technique [0002] Nuclear power is an advanced clean energy, an important part of the national energy strategy, and one of the most important measures to achieve the national goal of energy conservation and emission reduction. The high-temperature gas-cooled reactor nuclear power plant has the characteristics of high safety, simple system, high power generation efficiency, wide application, and strong economic competitiveness. It is one of the fourth-generation advanced nuclear reactor types required by the future energy market. [0003] The inlet helium temperature of the steam generator in the high-temperature gas-cooled reactor nuc...

Claims

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Application Information

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IPC IPC(8): C22C19/05C22C30/02C22C1/02C22F1/10C21D9/08B21B1/16B21J5/00F22B1/16
Inventor田洪志伍龙燕汪景新肖三平孟剑张进周振德周勤罗宝军张振鲁许杰孙惠敏
Owner华能核能技术研究院有限公司