A nickel-based corrosion-resistant alloy pipe and its manufacturing method

Abstract

The invention discloses a nickel-base anti-corrosion alloy pipe for a high-temperature gas-cooled reactor steam generator and a manufacturing method of the nickel-base anti-corrosion alloy pipe. The nickel-base anti-corrosion alloy pipe comprises the components of, by weight, 0.03-0.04% of C, less than or equal to 0.010% of P, less than or equal to 0.010% of S, 20.0-23.0% of Cr, greater than or equal to 58.0% of Ni, 8.5-9.5% of Mo, 3.3-3.8% of Nb, 0.35-0.60% of Al, 0.35-0.60% of Ti, 0.002-0.005% of Mg, 3.0-5.0% of Fe, 0.90-1.0% of Al and Ti, and the balance unavoidable impurities. According tothe nickel-base anti-corrosion alloy pipe, the pipe structure is even, the grain size reaches 3-5 grades, the tensile strength at the room temperature is higher than or equal to 700 MPa, the yield strength is higher than or equal to 300 MPa, and the ductility is higher than or equal to 40%; the high-temperature strength at the temperature of 750 DEG C is higher than or equal to 500 MPa, the yieldstrength is higher than or equal to 210 MPa, and the ductility is higher than or equal to 90%; flattening is conducted till the inner wall distance is two times of the wall thickness, cracks cannot be generated on a sample after flattening is conducted, pipes are subjected to the hydrostatic test under the water pressure being 20 MPa one by one, and the phenomenon of water leakage or sweating cannot occur; and the pipes are subjected to liquid permeation testing one by one, the permeation defect is not allowed to occur on the surface, extrapolation is conducted for 105 hours at the temperature of 750 DEG C and the endurance strength is higher than or equal to 75.3 MPa, and the manufacturing requirements of the high-temperature gas-cooled reactor steam generator are met.

Description

technical field [0001] The invention belongs to the technical field of nickel-based corrosion-resistant alloy seamless pipe material processing, and in particular relates to a nickel-based corrosion-resistant alloy pipe material for a high-temperature gas-cooled reactor steam generator and a manufacturing method thereof. 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 energy conservation and emission reduction goals. The modular high-temperature gas-cooled reactor nuclear power plant has the characteristics of high safety, simple system, high power generation efficiency, wide application, and economic competitiveness. It is one of the fourth-generation advanced nuclear reactor types required by the future energy market. The inlet helium temperature of the steam generator in the high-temperature gas-cooled reactor nuclear power plant is as...

AI Technical Summary

Problems solved by technology

The inlet helium temperature of the steam generator in the high-temperature gas-cooled reactor nuclear power plant is as high as 750°C, so that the long-term working temperature of the steam generator inlet chamber and the parts in the heat exchange assembly also reaches 750°C. Performance, transient performance at 750°C, durable performance at 750°C, structural stability, corrosion performance, etc. put forward strict requirements, and ordinary austenitic stainless steel and nickel-based alloys can no longer meet the requirements for use