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Cast steel part for ultra-supercritical thermal power generating unit and production process of cast steel part

A thermal power unit, ultra-supercritical technology, applied to the improvement of process efficiency, casting mold, casting mold composition, etc., can solve the problems of difficult production, poor mechanical properties, etc., to achieve improved solid solubility, good thermal stability, The effect of improving toughness

Active Publication Date: 2015-09-02
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 cast steel part for an ultra-supercritical thermal power unit and its production process, the purpose of which is to solve the problems of poor mechanical properties and difficult production of cast steel parts

Method used

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  • Cast steel part for ultra-supercritical thermal power generating unit and production process of cast steel part
  • Cast steel part for ultra-supercritical thermal power generating unit and production process of cast steel part
  • Cast steel part for ultra-supercritical thermal power generating unit and production process of cast steel part

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A cast steel component used for an ultra-supercritical thermal power unit, the steps of its production process are as follows:

[0027] (1) Using an intermediate frequency furnace with a quartz sand lining for melting, steel shavings, rust-free low-carbon punched briquettes and micro-carbon ferrochrome are mixed and then heated and melted by an intermediate frequency furnace to form molten steel in a molten state.

[0028] (2) Put the molten steel into the AOD refining furnace for refining.

[0029] (3) Ferrosilicon and electrolytic manganese are added to the refined molten steel for smelting.

[0030] (4) Add the returned material of the same grade after derusting for smelting, and after the molten steel is melted, take a sample and analyze its chemical composition with a spectrometer.

[0031] (5) According to the results of chemical composition analysis, the alloy composition of molten steel is fine-tuned; the added alloy material is baked to 200°C before adding.

...

Embodiment 2

[0047] A cast steel component used for an ultra-supercritical thermal power unit, the steps of its production process are as follows:

[0048] (1) Using an intermediate frequency furnace with a quartz sand lining for melting, steel shavings, rust-free low-carbon punched briquettes and micro-carbon ferrochrome are mixed and then heated and melted by an intermediate frequency furnace to form molten steel in a molten state.

[0049] (2) Put the molten steel into the AOD refining furnace for refining.

[0050] (3) Ferrosilicon and electrolytic manganese are added to the refined molten steel for smelting.

[0051] (4) Add the returned material of the same grade after derusting for smelting, and after the molten steel is melted, take a sample and analyze its chemical composition with a spectrometer.

[0052] (5) According to the results of chemical composition analysis, the alloy composition of molten steel is fine-tuned; the added alloy material is baked to 200°C before adding.

...

Embodiment 3

[0068] A cast steel component used for an ultra-supercritical thermal power unit, the steps of its production process are as follows:

[0069] (1) Using an intermediate frequency furnace with a quartz sand lining for melting, steel shavings, rust-free low-carbon punched briquettes and micro-carbon ferrochrome are mixed and then heated and melted by an intermediate frequency furnace to form molten steel in a molten state.

[0070] (2) Put the molten steel into the AOD refining furnace for refining.

[0071] (3) Ferrosilicon and electrolytic manganese are added to the refined molten steel for smelting.

[0072] (4) Add the returned material of the same grade after derusting for smelting, and after the molten steel is melted, take a sample and analyze its chemical composition with a spectrometer.

[0073] (5) According to the results of chemical composition analysis, the alloy composition of molten steel is fine-tuned; the added alloy material is baked to 200°C before adding.

...

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Abstract

The invention discloses a cast steel part for an ultra-supercritical thermal power generating unit. The cast steel part is characterized by being prepared from the following chemical components in percentage by weight: 0.15 to 0.20% of C, not greater than 0.60% of Si, 0.4 to 0.8% of Mn, not greater than 0.02% of P, not greater than 0.015% of S, 2.2 to 2.5% of Cr, not greater than 0.5% of Ni, 0.5 to 0.8% of Mo, not greater than 0.5% of Cu, 0.3 to 0.4% of V, and the balance of Fe and inevitable micro impurities. The invention further discloses a process for producing the cast steel part. The cast steel part is high in wear resistance, corrosion resistance and heat resistance, high in toughness, and applicable to the ultra-supercritical thermal power generating unit.

Description

technical field [0001] The invention relates to an ultra-supercritical thermal power unit and its production process, in particular to a cast steel component for an ultra-supercritical thermal power unit and its production process. Background technique [0002] The so-called supercritical unit refers to the unit whose main steam pressure is greater than the critical pressure of water of 22.12 MPa, while the subcritical unit usually refers to the unit whose outlet pressure is 15.7-19.6 MPa. Traditionally, the supercritical unit is divided into two levels: one is the conventional supercritical parameter unit, its main steam pressure is generally about 24 MPa, and the temperature of the main steam and reheat steam is 540-560 ° C; For critical units, the main steam pressure is 25-35 MPa and above, and the temperature of main steam and reheat steam is generally above 580°C. [0003] The cast steel components (such as cylinders, semi-ring castings, etc.) are important components ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/46C22C38/24C22C33/06C21C7/06B22C9/02
CPCY02P10/20
Inventor 蔡建黄高翔郑明华刘薇刘渊毅黄志达
Owner SANMING CITY YIJUN MACHINERY FOUNDRY
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