Austenite corrosion-resisting nickel-based casting alloy and manufacturing process thereof

Abstract

The invention provides an austenite corrosion-resisting nickel-based casting alloy and a manufacturing process thereof, belonging to the technical field of material engineering. The austenite corrosion-resisting nickel-based casting alloy is composed of the chemical components in mass percentage: less than 0.080% of carbon (C), 21.0-25.0% of chromium (Cr), 8.0-10.0% of cobalt (Co), 5.0-8.0% of molybdenum (Mo), less than 4.0% of iron (Fe), 3.0-4.5% of niobium (Nb), less than 0.6% of silicon (Si), less than 0.6% of manganese (Mn), 0.2-0.5% of titanium (Ti), 0.2-0.5% of aluminum (Al), less than 0.015% of phosphorus (P), less than 0.015% of sulfur (S) and residual amount of nickel (Ni) and unavoidable impurity elements. The austenite corrosion-resisting nickel-based casting alloy is formed by the steps of: smelting in a non-vacuum electric arc furnace, refining by an argon oxygen decarburizing furnace and an LF (Ladle Furnace) steel ladle argon blowing refining process, and directing casting and molding under the protection of argon gas.

Description

technical field [0001] The invention relates to an austenitic corrosion-resistant nickel-based casting alloy material and its preparation process. The material has good high-temperature strength and corrosion resistance such as oxidation and sulfidation, and can be applied to long-term high-temperature oxidation and sulfidation environments in the petroleum and chemical industry fields. The joints and valves and other pressure-bearing parts that can be cast and formed, the smelting method does not use the vacuum smelting method commonly used for nickel-based alloys, and belongs to the field of material engineering technology. Background technique [0002] Compared with iron-based stainless steels, nickel-based alloys have obvious advantages in strength and corrosion resistance under many complex corrosive environments and high temperature conditions, and are widely used in many fields such as aviation and aerospace, electric power, petroleum and chemical industry. [0003] D...

AI Technical Summary

Problems solved by technology

In the process of alloy smelting and preparation, there are strict requirements on the control of the composition of alloy elements, the content of harmful elements and inclusions. In the past, the preparation process routes of vacuum smelting and vacuum casting were basically adopted. Vacuum smelting generally includes vacuum induction melting, Vacuum self-consumption remelting and electroslag remelting, etc., and casting mostly adopts the investment casting method under vacuum conditions. In this case, the weight and size of the castings are very small, which cannot be applied to large castings in the civilian field.

Images