Steel for R4-grade mooring cables and preparation method thereof
A mooring chain and ton steel technology is applied in the field of R4 grade mooring chain steel and its preparation, which can solve the problems of high alloy composition, internal cracks in the material, influence on welding performance, etc., so as to reduce the amount of inclusions and preparation. cost, the effect of improving alloy yield
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Embodiment 1
[0025] Prepare a steel for mooring chains of R4 grade with a diameter of 120mm. The chemical composition of molten steel is calculated by weight percentage: C: 0.165%, Si: 0.193%, Mn: 1.29%, P: 0.020%, S: 0.015% , Cu: 0.02%, Cr: 0.95%, Ni: 0.87%, Mo: 0.33%, Al: 0.037%, As: 0.0040%, Sb: 0.0035%, Sn: 0.0028%, N: 0.0032%, O: 0.0016% , H: 0.0013%;
[0026] Its preparation method includes the steps of molten iron desulfurization, converter smelting, argon blowing, LF furnace refining, RH furnace vacuum treatment, continuous casting, billet heating, rolling, air cooling, and non-destructive testing, wherein:
[0027] When the molten iron is desulfurized, the magnesium powder desulfurization process is adopted to control the sulfur content S of the molten iron leaving the station to 0.010%, and the desulfurization slag in the tank must be cleaned;
[0028] During converter smelting, the amount of steel scrap loaded accounts for 10% of the total amount loaded; the converter adopts to...
Embodiment 2
[0039] Prepare a steel for mooring chains of R4 grade with a diameter of 105mm. The chemical composition of molten steel is calculated by weight percentage: C: 0.191%, Si: 0.25%, Mn: 1.27%, P: 0.013%, S: 0.012% , Cu: 0.012%, Cr: 0.89%, Ni: 0.83%, Mo: 0.29%, Al: 0.037%, As: 0.0036%, Sb: 0.0022%, Sn: 0.0034%, N: 0.0027%, O: 0.0011% , H: 0.0009%.
[0040] The preparation method includes the steps of molten iron desulfurization, converter smelting, argon blowing, LF furnace refining, RH furnace vacuum treatment, continuous casting, billet heating, rolling, air cooling, and nondestructive testing, wherein:
[0041] When the molten iron is desulfurized, the magnesium powder desulfurization process is adopted to control the sulfur content S of the molten iron leaving the station to 0.010%, and the desulfurization slag in the tank must be cleaned;
[0042] During converter smelting, the amount of steel scrap loaded accounts for 15% of the total amount loaded; the converter adopts top...
Embodiment 3
[0053] Prepare a steel for R4 grade mooring chains with a diameter of 125mm. The chemical composition of molten steel is calculated by weight percentage: C: 0.20%, Si: 0.25%, Mn: 1.35%, P: 0.025%, S: 0.025% , Cu: 0.02%, Cr: 1.23%, Ni: 1.09%, Mo: 0.290%, Al: 0.35%, As: 0.0027%, Sb: 0.0015%, Sn: 0.0031%, N: 0.0023%, O: 0.0012% , H: 0.0014%.
[0054] The preparation method includes the steps of molten iron desulfurization, converter smelting, argon blowing, LF furnace refining, RH furnace vacuum treatment, continuous casting, billet heating, rolling, air cooling, and nondestructive testing, wherein:
[0055] When the molten iron is desulfurized, the magnesium powder desulfurization process is adopted to control the sulfur content S of the molten iron leaving the station to 0.009%, and the desulfurization slag in the tank must be cleaned;
[0056] During converter smelting, the amount of steel scrap loaded accounts for 12% of the total amount loaded; the converter adopts top-bott...
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