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Medium-temperature oxidation-resistant nickel-based corrosion-resistant alloy and preparation process thereof

A technology for corrosion-resistant alloy and preparation process, applied in the field of corrosion-resistant alloy, can solve the problems of poor cold and hot processing performance, high manufacturing cost, difficult welding, etc., and achieve the effects of excellent corrosion resistance, low production cost, and moderate room temperature strength.

Pending Publication Date: 2021-12-24
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Some experimental devices plan to use corrosion-resistant alloys such as Inconel 671, Inconel 625, and Hastelloy C-276, but these materials more or less have problems such as poor cold and hot workability, difficult welding, poor corrosion resistance, and high manufacturing costs. question

Method used

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  • Medium-temperature oxidation-resistant nickel-based corrosion-resistant alloy and preparation process thereof
  • Medium-temperature oxidation-resistant nickel-based corrosion-resistant alloy and preparation process thereof
  • Medium-temperature oxidation-resistant nickel-based corrosion-resistant alloy and preparation process thereof

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Embodiment Construction

[0027] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0028] Three 20kg ingots were melted in a vacuum induction furnace, and the ingots were directly forged and hot-rolled into bars with a diameter of 14mm. The initial deformation temperature of forging and hot rolling is 1150-1170°C, and the final deformation temperature is not lower than 950°C. The chemical composition of hot-rolled bars is shown in Table 1.

[0029] The heat treatment system of the alloy of the present invention is solid solution at 1100-1150° C., the holding time varies depending on the size of the finished alloy, and the minimum holding time is 30 minutes.

[0030] Table 1 adopts three kinds of alloy chemical composition (wt.%) of the present invention of vacuum induction furnace smelting

[0031]

[0032] No.1, No.2 and No.3 alloys in Table 1 were solid solution treated at 1150°C for 30min, and the instantaneous mechanical properties...

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Abstract

The invention discloses a medium-temperature oxidation-resistant nickel-based corrosion-resistant alloy and a preparation process thereof, and belongs to the technical field of corrosion-resistant alloys. The alloy comprises the following chemical components of, in percentage by weight, less than or equal to 0.02% of C, 16%-24% of Cr, 4%-9% of Mo, less than or equal to 1.2% of Ti, 6%-15% of Fe, less than or equal to 0.006% of B and the balance Ni. The alloy belongs to a solid solution strengthened nickel-based corrosion-resistant alloy and has excellent high-temperature oxidation resistance. When the alloy is used under the supercritical conditions that PO4 < 3-> serves as a main component, SO4 < 2- >, NO3 < - >, H < + >, OH < - > and other multi-ions coexist, the temperature ranges from 350 DEG C to 600 DEG C, and the pressure intensity ranges from 20 MPa to 30 MPa, the corrosion resistance of the alloy is obviously better than that of Inconel 671, Inconel 625 and Hastelloy C-276, and the alloy can be used as a reactor material for wastewater treatment and municipal sludge equipment under the supercritical water oxidation environment condition.

Description

technical field [0001] The invention relates to the technical field of corrosion-resistant alloys, in particular to a medium-temperature oxidation-resistant nickel-based corrosion-resistant alloy and a preparation process thereof. Background technique [0002] At present, with the expansion of my country's cities and the rapid development of industrial enterprises, the service conditions of corrosion-resistant materials have become more and more stringent. People have been pursuing the development of superalloys with more outstanding performance, and at the same time hope to obtain greater versatility. However, this requirement itself is a contradiction. At present, there is no "universal" alloy. Therefore, according to the requirements of the use environment, taking into account the performance and cost and refining the development of alloys, it is a hot spot and an inevitable trend in the development of corrosion-resistant alloys at home and abroad. . At present, my country...

Claims

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Application Information

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IPC IPC(8): C22C19/05C22C1/02C22F1/10
CPCC22C19/055C22C1/023C22F1/10
Inventor 马颖澈查向东李昊泽高明梁田刘奎
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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