Production method of hot-rolled seamless steel pipe billet
A production method and seamless steel pipe technology, applied in the direction of improving process efficiency, etc., can solve the problems that hot-rolled seamless steel pipe blanks cannot meet the direct cold drawing production process, and achieve low yield strength, improved band structure, and easy The effect of the operation
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Embodiment 1
[0040] The production method of the hot-rolled seamless steel pipe billet of the present invention mainly includes the steps of steelmaking, continuous casting, pipe rolling and on-line heat treatment, and the seamless steel pipe billet produced by the hot-rolled seamless steel pipe billet production method is mainly used for production cylinder.
[0041] The production specifications are 159*17 hot-rolled seamless steel pipe blanks for oil cylinders. The chemical composition of the hot-rolled seamless steel pipe blanks for oil cylinders is shown in Table 1 by weight percentage (%), and the balance is Fe and other impurities.
[0042] C Si mn P S Cr Ni Cu
[0043] 0.24 0.28 0.76 0.013 0.014 0.03 0.03 0.06
[0044] Table I
[0045] In the steelmaking step, the step of pre-desulfurizing molten iron is firstly carried out, and then the molten steel is initially smelted in a 70T converter, and the molten iron is fed into the converter f...
Embodiment 2
[0059] The production method of this embodiment is exactly the same as that of Example 1, the only difference is that the specifications of the hot-rolled seamless steel pipe blanks for oil cylinders produced in this embodiment are 168*15 hot-rolled seamless steel pipe blanks for oil cylinders. The chemical composition of the hot-rolled seamless steel pipe blanks for oil cylinders is shown in Table 4 by weight percentage (%), and the balance is Fe and other impurities.
[0060] C Si mn P S Cr Ni Cu 0.25 0.28 0.80 0.012 0.013 0.03 0.03 0.07
[0061] Table four
[0062] In this embodiment, during converter smelting, the carbon content and phosphorus content are controlled during converter tapping, the carbon content is 0.13%, and the phosphorus content is 0.007%. During the alloying operation, the content of each chemical component in the molten steel is adjusted according to the content of each chemical component in the hot-rolled seamless ste...
Embodiment 3
[0069] The production method of this embodiment is exactly the same as that of Example 1, the only difference is that the specification of the hot-rolled seamless steel pipe blank for oil cylinders produced in this embodiment is 139.7*17 hot-rolled seamless steel pipe blanks for oil cylinders, the specification The chemical composition of the hot-rolled seamless steel pipe blanks for oil cylinders is shown in Table 7 by weight percentage (%), and the balance is Fe and other impurities.
[0070] C Si mn P S Cr Ni Cu 0.25 0.30 0.83 0.015 0.014 0.03 0.02 0.06
[0071] Table seven
[0072] In this embodiment, during converter smelting, the carbon content and phosphorus content are controlled when the converter is tapping, and the carbon content is 0.14%, and the phosphorus content is 0.008%. During the alloying operation, adjust the content of each chemical component in the molten steel according to the content of each chemical component in the h...
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Abstract
Description
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Application Information
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