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

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...

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

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