Process for industrially producing ultrapure Inconel 690 (I-690) alloy electroslag remelting ingot of 3 tons
A process method, electroslag remelting technology, applied in the field of electroslag remelting, can solve the problems of difficult control of O content and tissue control, etc., achieve uniform structure, ensure efficiency and economy, and choose reasonable cooling water temperature Effect
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[0035] Example 1
[0036] A process method for industrially producing 3 tons of I-690 alloy electroslag remelting ingots, the specific operation steps are as follows:
[0037] 1) Prepare the electrode: the electrode size is φ430mm×2980mm. Before remelting, the electrode is cut and polished to ensure that the two ends are parallel and flat, and the cylindrical surface is polished clean. The surface must not have serious cracks, heavy skin, fins, Defects such as scarring and slag inclusion, no oxide scale or rust, and grease and refractory fragments adhered to the surface are removed; and baked at 700°C for 8 hours.
[0038] 2) Prepare the crystallizer: the size of the crystallizer is 503mm in the upper inner mouth diameter, 527mm in the lower inner mouth diameter and 2400mm in length; clean the dirt on the inner surface of the crystallizer before remelting to ensure that the surface is dry and free of dirt.
[0039] 3) Use polishing equipment to polish the surface of the copper bottom ...
Example Embodiment
[0052] Example 2
[0053] The difference from Example 1 is:
[0054] The slag material ratio used is (mass fraction): 64% calcium fluoride, 16% calcium oxide, 15% aluminum oxide, 1.5% titanium dioxide, and the rest is magnesium oxide.
[0055] The thickness of the first starting plate is 7mm, its outer diameter is 40mm larger than the diameter of the inner hole at the lower end of the mold, and the inner diameter is 17mm smaller than the diameter of the second starting plate; the thickness of the second starting plate is 40mm.
[0056] When argon is introduced into the crystallizer, the gas flow rate is 180L / min. Keep it for 35min until the residual oxygen content in the gas hood is less than 0.5% of the capacity. Adjust the argon flow rate to 55L / min. The steady-state melting rate during the steady-state melting period is 7.8 kg / min. The chemical composition analysis data of the alloy after remelting is shown in Table 4.
Example Embodiment
[0057] Example 3
[0058] The difference from Example 1 is:
[0059] The slag material ratio used is (mass fraction): 63% calcium fluoride, 14% calcium oxide, 16% alumina, 2% titanium dioxide, and the rest is magnesium oxide.
[0060] The thickness of the first starting plate is 6mm, its outer diameter is 30mm larger than the diameter of the inner hole at the lower end of the mold, and the inner diameter is 20mm smaller than the diameter of the second starting plate; the thickness of the second starting plate is 30mm.
[0061] When argon is introduced into the crystallizer, the gas flow rate is 150L / min. Keep it for 40min until the residual oxygen content in the hood is less than 0.5% of the capacity. Adjust the argon flow rate to 50L / min. The steady-state melting rate in the steady-state melting period is 7.2kg / min. The chemical composition analysis data of the alloy after remelting is shown in Table 4.
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