9% Ni steel super-large-sized rotor forging applied to ultralow-temperature engineering and preparation method thereof
A technology for oversized, rotor forgings, used in metal processing equipment, furnace types, manufacturing tools, etc., to achieve good grain condition, excellent room temperature and low temperature mechanical properties, and good internal structure uniformity.
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[0033] The invention provides a method for preparing a 9% Ni steel ultra-large rotor forging for ultra-low temperature engineering, comprising the following steps:
[0034] Weigh the corresponding raw materials according to the following weight percentages: C 0.02~0.06%, Si≤0.20%, Mn0.50~0.80%, S≤0.003%, P≤0.008%, Cr≤0.20%, Ni 9.50%~10.0%, Mo0 .08~0.14%, Cu0.10~0.20%, Al≤0.015%, As≤0.005%, Sn≤0.005%, Sb≤0.0015%, Pb≤0.005%, Bi≤0.005%, H≤1.0ppm, O≤ 20ppm, N≤50ppm, the balance is high-purity Fe;
[0035] The weighed raw materials are smelted by vacuum induction-electroslag remelting process, and the obtained smelting liquid is cast to obtain steel ingots;
[0036] Stepwise heating and forging the steel ingot to obtain a rotor forging;
[0037] The rotor forging is sequentially subjected to preliminary heat treatment and performance heat treatment to obtain a 9% Ni steel ultra-large rotor forging for ultra-low temperature engineering.
[0038]The present invention weighs corres...
Embodiment 1
[0077] Weigh raw materials according to the following weight percentages: C 0.05%, Si 0.16%, Mn 0.74%, S 0.002%, P0.007%, Cr 0.12%, Ni 9.71%, Mo 0.09%, Cu 0.15%, Al 0.006%, As 0.003%, Sn0.002%, Sb 0.0012%, Pb 0.002%, Bi 0.002%, H 0.5ppm, O 10ppm, N 36ppm, the balance is high-purity Fe;
[0078] The weighed raw materials are smelted by vacuum induction-electroslag remelting process, and the obtained smelting liquid is cast to obtain steel ingots; the parameters of the vacuum induction-electroslag remelting include: the parameters of vacuum induction melting include: the chemical power is 700kW , the rate of power increase is 200kW / h; the refining temperature is 1570°C, and the vacuum degree is <0.1Pa; at the end of refining, Ca is used for early deoxidation, and after the composition is adjusted to pass, Ni-Mg alloy is used for final deoxidation, and the final tapping temperature is controlled at 1590°C ; The electroslag remelting process preferably includes: 4 sets / sets of vac...
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