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High-strength and high-temperature alloy for thermal power generating unit and processing technology of high-strength and high-temperature alloy

A technology for thermal power units and high-temperature alloys, applied in the field of materials and material preparation, can solve the problems of poor structure stability and corrosion resistance, high performance, low thermal strength, etc., and achieve the effect of excellent high-temperature strength performance.

Active Publication Date: 2020-07-10
HUANENG POWER INT INC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with nickel-based deformed superalloys, although the above-mentioned iron-nickel-based superalloys have advantages in raw material cost, they have low thermal strength, poor structural stability and poor corrosion resistance.
At the same time, since deformation processing is still required to obtain the structure and properties required for service, the preparation and processing technology is complicated, which makes the overall manufacturing cost higher and it is more difficult to further improve the performance

Method used

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  • High-strength and high-temperature alloy for thermal power generating unit and processing technology of high-strength and high-temperature alloy
  • High-strength and high-temperature alloy for thermal power generating unit and processing technology of high-strength and high-temperature alloy
  • High-strength and high-temperature alloy for thermal power generating unit and processing technology of high-strength and high-temperature alloy

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Experimental program
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preparation example Construction

[0028] The above-mentioned alloy preparation process mainly includes three steps of alloy melting, deformation and heat treatment, as follows:

[0029] (1) Smelting and homogenization treatment: the above-mentioned alloys are smelted in an induction electric arc furnace, the induction electric arc furnace is made of magnesium oxide basic furnace lining, the furnace is washed with pure nickel before smelting, and the alloy raw materials are subjected to shot blasting treatment before adding the alloy raw materials; the vacuum degree is controlled at Within the range of 0.3-0.5Pa, after Cr, Ni, W, Si, Mn, Mo and Fe in the alloy are completely melted, refine for 0.5-1h, and then add Al, Ti, B, Zr and C, and casting; after solidification, the ingot is homogenized in the range of 1050-1120 °C for 24-72 hours and then air-cooled to room temperature;

[0030] (2) Forging blanking: The alloy smelted and homogenized in step (1) is subjected to blank forging at 200-250°C above the γ' pr...

Embodiment 1

[0037] The high-strength high-temperature alloy for thermal power units of this embodiment comprises: C: 0.06%, Cr: 16%, Mn: 0.2%, Si: 0.15%, W: 1.6%, Mo: 1.2%, Ti: 2.2% by mass percentage %, Al: 1.4%, B: 0.002%, Zr: 0.02%, Fe: 37%, and the balance is Ni.

[0038] Alloy smelting adopts magnesium oxide basic furnace lining, and pure nickel is used to wash the furnace before smelting, and shot blasting is carried out before alloy raw materials are added. The alloy is smelted in an induction arc furnace, and the vacuum degree is controlled at 0.35Pa. After Cr, Ni, W and other elements are completely melted, it is refined for 40 minutes, and high-purity argon is introduced before adding Al, Ti, B, Zr, and C for protection. Add coke for deoxidation after Cr, Ni, W and other alloy raw materials are completely melted. , Zr, C and other elements that are easy to burn out, after stirring for 5 minutes, they are released from the furnace, and the casting temperature is 1630°C. Alloy c...

Embodiment 2

[0042] The high-strength superalloy of this embodiment includes: C: 0.07%, Cr: 15%, Mn: 0.2%, Si: 0.15%, W: 2.2%, Mo: 0.4%, Ti: 2.2%, Al: 1.4%, B: 0.002%, Zr: 0.02%, Fe: 47%, and the balance is Ni. Alloy smelting adopts magnesium oxide basic furnace lining, and pure nickel is used to wash the furnace before smelting, and shot blasting is carried out before alloy raw materials are added. The alloy is smelted in an induction arc furnace, and the vacuum degree is controlled at 0.35Pa. After Cr, Ni, W and other elements are completely melted, it is refined for 40 minutes, and high-purity argon is introduced before adding Al, Ti, B, Zr, and C for protection. Add coke for deoxidation after Cr, Ni, W and other alloy raw materials are completely melted, and the added mass should not exceed 40% of the mass of C element in the alloy raw material. After completion, add Ni-Mg alloy for secondary deoxidation, and finally add Al, Ti, B , Zr, C and other easily burnt elements, after stirrin...

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Abstract

The invention provides a high-strength and high-temperature alloy for a thermal power generating unit and a processing technology of the high-strength and high-temperature alloy. The high-strength andhigh-temperature alloy is prepared from the components in percentage by mass: 0.05-0.08% of C, 14-17% of Cr, less than or equal to 0.5% of Mn, less than or equal to 0.5% of Si, 1.0-2.5% of W, 0.3-2.0% of Mo, 2.0-2.5% of Ti, 1.0-1.5% of Al, less than or equal to 0.003% of B, less than or equal to 0.03% of Zr, 37-48% of Fe, and the balance of Ni. The processing technology comprises the steps that an electric-arc furnace is adopted at the vacuum degree not exceeding 0.5Pa to smelt pre-matched alloy furnace charge; the alloy is subjected to cogging forging with the deformation amount reaching 70%within the temperature range of 200-250 DEG C above Ni3Al (gamma') precipitation temperature; and high-temperature rolling with the deformation amount reaching 80% above the precipitation temperatureof 150-200 DEG C. The alloy has excellent high-temperature mechanical properties above 650 DEG C.

Description

technical field [0001] The invention belongs to the field of materials and material preparation, and in particular relates to a high-strength superalloy for thermal power units and a processing technology thereof. It can meet the processing and service performance requirements of thick-walled parts such as main steam pipes and headers of 700°C advanced ultra-supercritical thermal power units. Background technique [0002] As my country's electricity demand continues to increase, energy shortages and environmental pollution problems have become increasingly prominent, and the need to develop high-efficiency, energy-saving, and environmentally friendly power generation methods has become increasingly urgent. Thermal power generation has been the most important power generation technology in my country for a long time, and improving the steam parameters of the unit is considered to be the most effective way to solve the above problems. A lot of practice in the past has shown t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C30/00C22C1/02C22C33/04B22D27/00C21C7/10C21D8/00C21D1/00C22F1/10
CPCC22C30/00C22C19/056C22C38/54C22C38/50C22C38/44C22C38/06C22C38/04C22C38/02C22C1/023C22C33/04B22D27/00C21C7/10C21D8/005C21D1/00C22F1/10C21D6/004C21D1/26C21D7/13C21D1/78C21D9/0081B22D21/025C22C38/00
Inventor 严靖博杨征谷月峰袁勇孙宇明张兴营刘茜
Owner HUANENG POWER INT INC
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