Manufacturing method of 825 anti-corrosion alloy bar material with super-large diameter

Abstract

The invention discloses a manufacturing method of 825 anti-corrosion alloy bar material with a diameter phi of 1300 mm. The purpose is to solve the technical problem that the risks that chemical compositions and homogeneity do not meet a standard stipulation can be caused, and segregation and porosity existing in a macroscopic examination structure can be caused when the diameter of a steel ingotis increased. According to an electric furnace and electroslag smelting novel technology and forging technology, 1, the technical route comprises the steps of smelting through a non-vacuum induction furnace, processing through an LF furnace, processing through a VOD furnace, conducting electroslag remelting, processing through an 8000 t high-speed forging machine, smoothing on a lathe and conducting packaging; 2, according to the specific solving measures and beneficial effects, (1) a superior raw material is selected to avoid drag-in of a harmful element; (2) the slag whitening time of the LFfurnace is prolonged to effectively reduce the content of D-type inclusion; (3) the vacuum degree of VOD is reduced, the degassing time is shortened, and the content of gas elements is reduced; (4) in the pouring process, ultra-low carbon protecting slag is used for optimizing the surfaces of electrodes, and the deficiency of double skin of the surfaces of the electrodes is overcome; and (5) increasing of the ingot case of steel ingot electroslag meets the requirement for the size of the finished products of phi 1300 mm, and meanwhile, the annealing requirements are increased to avoid the risk of cracking of the steel ingot.

Description

technical field [0001] The invention belongs to the field of metal material manufacturing, and in particular relates to a method for manufacturing an 825 corrosion-resistant alloy rod with a diameter of φ1300 mm, which is resistant to general corrosion and local corrosion and has good strength and toughness. Background technique [0002] 825 corrosion-resistant alloy is a Ni-Fe-Cr-Mo-Cu corrosion-resistant alloy stabilized with titanium, and its domestic designation is GB NS142. This alloy has good general corrosion resistance, local corrosion performance and good process performance, and is mainly used for heat exchangers, pipes, valves and pumps dealing with hot sulfuric acid and chloride-containing solutions. Previously, the diameter of 825 alloy bars produced in China was not greater than 400mm, but now it is necessary to produce 825 alloy bars with a diameter of φ1300mm to meet the needs of a key domestic project, and the technical indicators should reach: Inclusions: A...

AI Technical Summary

Problems solved by technology

825 alloy rods with a diameter of φ1300mm are ultra-large-sized rods in China, and there is no domestic manufacturer. As far as we know, there is only one foreign company that can produce corrosion-resistant alloy rods with similar specifications. The production technology is kept secret and there is no public document

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