30CrMo circular tube billet steel casting blank internal quality control method
A technology of internal quality and control methods, applied in the field of iron and steel metallurgy, can solve problems such as production and environmental protection adverse effects, leakage, brittle fracture, etc., and achieve the effects of optimizing and improving the production process, promoting the composition of molten steel, and promoting uniform growth
Inactive Publication Date: 2016-05-25
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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Problems solved by technology
Under the joint action of stress and hydrogen sulfide gas during use, brittle fracture (called hydrogen sulfide stress corrosion) will occur suddenly when the stress is much lower than its own yield strength, often causing problems such as production leakage, which is harmful to production and adverse impact on the environment
Method used
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Experimental program
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Effect test
Embodiment
[0017] A steelmaking plant adopts 120t converter smelting → LF furnace refining → RH refining → four-machine four-stream casting machine φ350mm section continuous casting to produce 30CrMo round tube billet. At the end of converter blowing, the end point carbon is controlled at 0.09%, the end point phosphorus is 0.007%, and the end point temperature is controlled at 1690°C.
[0018] When the molten steel arrives at the LF refining furnace, the molten steel fluctuates slightly for argon blowing, and there is no major overturning phenomenon. The outbound Als is controlled at 0.040%. After the refining is completed, the molten steel is softly blown with argon. After that, set the temperature to 1600°C.
[0019] After the molten steel arrives at the station, the RH refining argon blowing argon flow rate is controlled at 1320NL / min, the processing time when the vacuum degree is less than 3mbar is 11.5min, the RH outbound Als is 0.050%, after the vacuum treatment is completed, the a...
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The invention relates to the field of ferrous metallurgy, particularly a 30CrMo circular tube billet steel casting blank internal quality control method. The invention aims to provide a 30CrMo circular tube billet steel casting blank internal quality control method for integrally enhancing the rolled material quality control and improving the circular tube billet steel casting blank internal quality in the 30CrMo circular tube billet steel casting blank production process. The method comprises the following steps: a. carrying out converter smelting; b. refining molten steel in an LF (ladle furnace); c. carrying out RH refining; and d. finally, continuously casting molten steel. The electromagnetic stirring parameters of the crystallizer are as follows: the stirring current is 350-400A, and the frequency is 2-4Hz; the solidifying tail end electromagnetic stirring parameters are as follows: the stirring current is 200-300A, and the frequency is 6.0-8.0Hz; the superheating temperature is controlled at 15-30 DEG C; and the specific water quantity for secondary cooling is controlled at 0.21-0.29 / kg steel. The method is especially suitable for producing the 30CrMo circular tube blank and steel casting blank with the cross section of phi350mm.
Description
technical field [0001] The invention relates to the field of iron and steel metallurgy, in particular to a method for controlling the internal quality of a 30CrMo round billet steel billet. Background technique [0002] 30CrMo billet steel is mainly used for the production of steel for oil well pipes used in oil and gas exploitation and transportation. P≤0.020%, S≤0.010%, V≤0.015%, Cr: 0.85%~1.05%, Mo: 0.17%~0.24%, Cu≤0.15%, Ni≤0.20%, Alt: 0.020%~0.040%, Residual element requirements: Nb≤0.010%, Ti≤0.010%, B≤0.005%, and V+Nb+Ti+B+Zr≤0.15%; As≤0.015%, Sn≤0.010%, Sb≤0.010%, Pb≤0.008 %, Bi≤0.010%, and As+Sn+Sb+Pb+Bi≤0.045%, and the balance is Fe. Under the joint action of stress and hydrogen sulfide gas during use, brittle fracture (called hydrogen sulfide stress corrosion) will occur suddenly when the stress is much lower than its own yield strength, often causing problems such as production leakage, which is harmful to production and adverse effects on the environment. Wi...
Claims
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IPC IPC(8): C22C38/02C22C38/04C22C38/12C22C38/18C22C38/16C22C38/08C22C38/06C21C5/28C21C7/072C21C7/10B22D11/115
CPCC22C38/02B22D11/115C21C5/28C21C7/072C21C7/10C22C38/04C22C38/06C22C38/08C22C38/12C22C38/16C22C38/18
Inventor 李红光陈天明郭华李扬洲陈亮郭奠荣杨文中李志强冯远超
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP