Pipe material with excellent high temperature strength and stability and preparation method of pipe material

Abstract

The invention relates to a pipe material with excellent high temperature strength and stability and a preparation method of the pipe material. The pipe material is prepared from the following alloy components by weight percent: 0.03 to 0.06 percent of C, 6 to 10 percent of Ni, 15 to 20 percent of Cr, 2.0 to 6.5 percent of Al, 1.0 to 3.0 percent of Mo, 4.5 to 8.0 percent of W, 1.5 to 2.0 percent ofNb, less than or equal to 1.0 percent of Ti, less than or equal to 0.1 percent of Zr, less than or equal to 0.01 percent of B, and the balance of Fe. The prepared alloy is smelted into alloy mother liquid, then the alloy mother liquid is prepared into alloy cast ingot, and the alloy cast ingot is rolled into a molded sheet in a range of 850 to 1100 DEG C; and the solid-solution treatment and theaging treatment are performed for the rolled sheet, and the pipe material with excellent high temperature strength and stability is obtained. The pipe material has good high temperature machining performance; and moreover, the high temperature strength and toughness are excellent, the yield strength at 700 DEG C is not lower than 300MPa, the extension rate is higher than 40 percent, and the shrinkage rate of a fracture surface is higher than 80 percent.

Description

technical field [0001] The invention belongs to the field of metal materials, and in particular relates to a pipe material with excellent high-temperature strength and stability and a preparation method thereof. Background technique [0002] High chromium martensitic heat-resistant steel has been widely used because of its low cost and excellent performance. The high chromium content ensures that the alloy has good oxidation resistance and corrosion resistance, which further ensures the performance of the alloy under severe working conditions. Among them, the most representative is 9-12Cr martensitic heat-resistant steel, which has been widely used in supercritical and ultra-supercritical thermal power units. However, with the gradual increase of steam parameters of thermal power units, the performance requirements of materials are becoming more and more stringent. Traditional materials have been difficult to meet the impact of steam temperature rise on materials. Therefo...

AI Technical Summary

Problems solved by technology

However, austenitic heat-resistant steel has disadvantages such as high thermal expansion coefficient, poor heat transfer, and high cost.

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