Production method of X80 pipeline steel wide and thick plate
A production method and technology for wide and thick plates, applied in the production field of X80 pipeline steel wide and thick plates, can solve problems such as increasing the difficulty of plate shape control, and achieve the effects of improving low-temperature drop hammer crack arrest performance, uniform performance, and easy plate shape control.
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Embodiment 1
[0020] Embodiment 1: The production method of X80 pipeline steel wide and thick plate, the thickness of the steel plate is 30.8mm, and the width of the steel plate is 4350mm.
[0021] The mass percentage of chemical composition of steel is: C=0.04%, Si=0.07%, Mn=1.73%, P=0.009%, S=0.0012%, Als=0.039%, Nb=0.062%, Ti=0.016%, Cr= 0.18%, Mo=0.17%, Ni=0.19%, Cu=0.13%, B=0.0003%, Ca=0.0012%, Pcm=0.16%, the balance is Fe and unavoidable impurities;
[0022] The key process steps and parameters are:
[0023] (1) Smelting: Converter tapping temperature 1623°C, end point [C]=0.045%, end point [O]=680ppm; after tapping, argon blowing and strong stirring, stirring time 31min, molten steel temperature after stirring 1557°C, [C]= 0.025%; then enter the LF furnace for heating and refining, deoxidation and alloying, and then enter the RH furnace for vacuum treatment; 200m of pure Ca line is fed out of LF, and 150m of pure Ca line is fed out of RH; [Si]=0.04% after LF furnace .
[0024] (2)...
Embodiment 2
[0029] Embodiment 2: The production method of X80 pipeline steel wide and thick plate, the thickness of the steel plate is 25.7mm, and the width of the steel plate is 4365mm.
[0030] The mass percentage of chemical composition of steel is: C=0.04%, Si=0.06%, Mn=1.71%, P=0.008%, S=0.0010%, Als=0.032%, Nb=0.055%, Ti=0.018%, Cr= 0.25%, Mo=0.11%, Ni=0.25%, Cu=0.13%, B=0.0002%, Ca=0.0015%, Pcm=0.16%, the balance is Fe and unavoidable impurities;
[0031] The key process steps and parameters are:
[0032] (1) Smelting: Converter tapping temperature 1632°C, end point [C]=0.05%, end point [O]=651ppm; after tapping, argon blowing and strong stirring, stirring time 39min, molten steel temperature after stirring 1545°C, [C]= 0.02%; then enter the LF furnace for heating and refining, deoxidation and alloying, and then enter the RH furnace for vacuum treatment; 200m of pure Ca line is fed out of the LF station, and 150m of pure Ca line is fed out of the RH station; [Si]=0.04% after the L...
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