9% Ni steel ultra-large rotor forging for ultra-low temperature engineering and its preparation method
A technology for rotor forgings and super-large specifications, which is applied in the field of ultra-low temperature engineering 9% Ni steel super-sized rotor forgings and its preparation, and achieves the effects of excellent room temperature and low temperature mechanical properties, good grain state, and good internal structure uniformity.
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Image
Examples
preparation example Construction
[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%, Mn 0.50~0.80%, S≤0.003%, P≤0.008%, Cr≤0.20%, Ni 9.50%~10.0%, Mo 0.08 ~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 corre...
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...
PUM
| Property | Measurement | Unit |
|---|---|---|
| diameter | aaaaa | aaaaa |
| tensile strength | aaaaa | aaaaa |
| thickness | aaaaa | aaaaa |
Abstract
Description
Claims
Application Information
Login to View More