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A cast steel part for nuclear power unit and its production process

A production process and technology for nuclear power units, which are applied in the field of zero-defect and high-quality cast steel parts for nuclear use and their production processes, can solve the problems of difficult production, low product quality, and poor mechanical properties of cast steel parts, etc. Achieve the effect of preventing the coarsening of grains, delaying precipitation, and improving solid solubility

Active Publication Date: 2018-12-07
SANMING CITY YIJUN MACHINERY FOUNDRY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention provides a nuclear cast steel part and its production process, and its purpose is to solve the problems of poor mechanical properties, low product quality and difficult production of cast steel parts

Method used

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  • A cast steel part for nuclear power unit and its production process
  • A cast steel part for nuclear power unit and its production process
  • A cast steel part for nuclear power unit and its production process

Examples

Experimental program
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Effect test

Embodiment 1

[0033] A cast steel component used for nuclear power units, the steps of its production process are as follows:

[0034] (1) Steel shavings and low-carbon punched briquettes without rust are heated and melted in an electric furnace to form molten steel in a molten state.

[0035] (2) Send the molten steel into the oxygen top-blown converter, and oxidize and remove Si, Mn, P, S, C, Ni and Cr from the molten steel to obtain low-impurity molten steel.

[0036] (3) Refining and purifying low-impurity molten steel in an AOD refining furnace.

[0037] (4) Add ferrosilicon, electrolytic manganese, low-carbon ferrochrome and metal zirconium to the refined molten steel for smelting.

[0038] (5) Add the cleaned and returned material of the same grade for smelting. After the molten steel is melted, take a sample of the molten steel for chemical composition analysis, that is, use a portable spectrometer to quickly analyze the chemical composition of the molten steel sample in front of t...

Embodiment 2

[0062] A cast steel component used for nuclear power units, the steps of its production process are as follows:

[0063] (1) Steel shavings and low-carbon punched briquettes without rust are heated and melted in an electric furnace to form molten steel in a molten state.

[0064] (2) Send the molten steel into the oxygen top-blown converter, and oxidize and remove Si, Mn, P, S, C, Ni and Cr from the molten steel to obtain low-impurity molten steel.

[0065] (3) Refining and purifying low-impurity molten steel in an AOD refining furnace.

[0066] (4) Add ferrosilicon, electrolytic manganese, low-carbon ferrochrome and metal zirconium to the refined molten steel for smelting.

[0067] (5) Add the cleaned and returned material of the same grade for smelting. After the molten steel is melted, take a sample of the molten steel for chemical composition analysis, that is, use a portable spectrometer to quickly analyze the chemical composition of the molten steel sample in front of t...

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Abstract

The invention discloses a zero-defect high-quality cast steel part for nuclear power. The cast steel part is characterized in that the cast steel part is chemically composed of, by weight, 0.18% to 0.20% of C, less than or equal to 0.60% of Si, 0.60% to 0.80% of Mn, less than or equal to 0.02% of P, less than or equal to 0.015% of S, 1.35% to 1.50% of Cr, less than or equal to 0.50% of Ni, 0.90% to 1.10% of Mo, 0.20% to 0.30% of V, less than or equal to 0.025% of Sn, 0.08% to 0.12% of Zr, the balance Fe and unavoidable trace impurities. The invention further discloses a technology used for producing the cast steel part, and according to the technology, the cast steel part has no defects, is high in quality, and is good in abrasion resistance and corrosion resistance, and high in toughness when in the high-temperature environment, and therefore, the cast steel part is suitable for a nuclear power unit.

Description

technical field [0001] The invention relates to a cast steel part and its production process, in particular to a nuclear zero-defect high-quality cast steel part and its production process. Background technique [0002] Cast steel parts for nuclear use are used in key positions of nuclear equipment. Because other processes cannot be manufactured or the production cost is too high technically, nuclear parts for nuclear use are produced by casting as needed. Nuclear equipment is high-end equipment. Due to the needs of operating environment, safety and durability, there are higher requirements for some performance and quality of cast steel parts. In addition to meeting the conventional mechanical performance requirements, since its operation often reaches a high temperature above 500°C, it is required to have good performance at high temperatures. [0003] The cast steel parts (such as cylinders, half-ring castings, etc.) are important parts of nuclear power units, and their q...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/50C22C38/46C22C38/44C22C38/28C22C38/24C22C38/22C22C38/04C22C38/02C22C33/06C21D1/18C21C7/06
CPCC21C7/0006C21C7/06C21D1/18C22C33/06C22C38/008C22C38/02C22C38/04C22C38/22C22C38/24C22C38/28C22C38/44C22C38/46C22C38/50
Inventor 刘渊毅蔡建黄高翔郑明华刘薇
Owner SANMING CITY YIJUN MACHINERY FOUNDRY
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