Electroslag remelting process of martensitic precipitation hardening stainless steel
A technology of electroslag remelting and precipitation hardening, applied in the field of electroslag production of S-containing steel, which can solve the problems of large removal amount and difficulty in controlling the burning loss of steel grade S
Active Publication Date: 2020-11-27
HENAN ZHONGYUAN SPECIAL STEEL EQUIP MFG CO LTD
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Problems solved by technology
In order to improve the machinability of steel, a certain amount of S is properly added to the steel grade. The main function of electroslag development in the early stage is to remove S. The removal amount of S content in the electroslag process is relatively large, so it is difficult to control the burning loss of steel grade S.
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Embodiment 1
[0026] Embodiment 1: The present invention requires S: 0.015%-0.030%, calculated according to the burning loss rate of electroslag S, and controlling the electrode blank S: 0.030%-0.045%. The melting point of this steel is 1400 ℃ ~ 1440 ℃, acid ternary slag is used for electroslag remelting, and the slag is CaF 2 : 60-70%, Al 2 o 3 : 20-30%, SiO 2 : 8% to 12%, the melting point of electroslag material is controlled at 1300°C to 1340°C. Before electroslag remelting, the slag is baked at 800°C for 4 hours to remove moisture. Crystallizer selection Q510mm / Q560mm crystallizer. The floating rust on the surface of the electrode blank and forging is treated by shot blasting machine. After the dummy electrode is welded on the consumable billet, put it into the heating furnace for heat preservation. The temperature rises to ≤150°C, and the temperature is kept at 450°C for ≥4 hours. The welding part is wrapped with asbestos cloth and taken out as needed. After the electrode blank ...
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Abstract
The invention relates to a martensitic precipitation-hardening stainless steel electroslag remelting process. In order to achieve good machinability, proper S content needs to be controlled in steel.For extremely high electroslag control difficulty, the content S of an electrode billet needs to be controlled in a certain range, the burning loss of the S in the electroslag meets the target requirement, the surface of the electrode billet for electroslag needs to be subjected to shot blasting or polishing treatment, baking and preheating can be performed according to the requirements before use, SiO2-containing acid slag is selected in the electroslag system and properly proportioned with fluorite and alumina, the melting point of the slag is controlled to be in a range of being 100-200 DEGC lower than the melting point of the steel, the smelting current is rapidly controlled to be stable after electroslag remelting, the current fluctuation range is controlled to be + / -10% of the set current, the electroslag remelting process is protected by argon, the flow is controlled by an ingot case, the air blowing manner can adopt down-shot or flat blowing, silico-calcium powder or powderedaluminium is added for deoxidizing according to the slag color in the electroslag remelting process, and by taking the previous measures, the burnout rate of S in the electroslag process is 38-50%.
Description
technical field [0001] The invention belongs to the technical field of electroslag production of S-containing steel, and in particular relates to an electroslag remelting process of martensitic precipitation hardening stainless steel. Background technique [0002] 17-4PH is a martensitic precipitation hardening stainless steel, which contains copper, niobium and other elements, and has the characteristics of high strength, hardness and corrosion resistance. After heat treatment, the mechanical properties of the product are more perfect, and the compressive strength can reach 1100-1300mpa. It has good attenuation performance, strong thermal corrosion fatigue and water drop resistance, and is widely used in aerospace, mechanical parts and other aspects. In order to improve the machinability of steel, a certain amount of S is appropriately added to the steel grade. The main function of electroslag development in the early stage is to remove S. The amount of S content removed d...
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IPC IPC(8): C22B9/18
CPCC22B9/18
Inventor 黄开元李晓杰韩德鸿翟文进王文洋
Owner HENAN ZHONGYUAN SPECIAL STEEL EQUIP MFG CO LTD