500MPa-grade niobium-containing screw-thread reinforcing steel bar and manufacturing method thereof
A technology of threaded steel bar and manufacturing method, which is applied to the 500MPa grade niobium-containing threaded steel bar and its manufacturing field, can solve the problems of high production difficulty and insufficient strengthening effect, and achieves reduction of the addition of precious alloy elements, reduction of production operation difficulty, and high steel strength. Effect
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Embodiment 1
[0049] A kind of 500MPa level niobium-containing threaded steel bar, its chemical composition and the mass fraction of each composition are shown in Table 1, the precipitates of the Nb-containing compound contained in it, and the RE-containing compound (in this embodiment, RE selects La) and / or See Table 2 for the number of inclusions containing Ti compounds.
[0050] A method for manufacturing 500MPa grade niobium-containing rebar, comprising the following steps:
[0051] Step 1, molten steel smelting
[0052] The molten iron is smelted into molten steel in a converter. When the tapping temperature is 1660°C, the mass fraction of carbon is 0.13%, the mass fraction of oxygen is 0.04%, the mass fraction of sulfur is 0.03%, and the mass fraction of phosphorus is 0.02%. Add silicon and manganese in the process of ~3 / 4, and adjust the content of C, Si, and Mn elements in molten steel after tapping to obtain molten steel;
[0053] Step 2: Inclusion Control
[0054] According to ...
Embodiment 2
[0065] A 500MPa level niobium-containing threaded steel bar, the chemical composition and the mass fraction of each composition are shown in Table 1, the precipitates of the Nb-containing compound contained in it, and the RE-containing compound (in this embodiment, RE selects Y) and / or See Table 2 for the number of inclusions containing Ti compounds.
[0066] A method for manufacturing 500MPa grade niobium-containing rebar, comprising the following steps:
[0067] Step 1, molten steel smelting
[0068] Melt molten iron and steel scrap (by mass ratio, molten iron:scrap = 5:1) into molten steel in a converter, tapping temperature 1670°C, carbon mass fraction 0.08%, oxygen mass fraction 0.06%, sulfur mass fraction 0.036% , when the mass fraction of phosphorus is 0.01%, silico-manganese is added in the process of tapping 1 / 3 to 3 / 4, and after tapping, the content of C, Si and Mn element components in molten steel is adjusted to obtain molten steel;
[0069] Step 2: Inclusion Con...
Embodiment 3
[0079] A kind of 500MPa level niobium-containing threaded steel bar, its chemical composition and the mass fraction of each composition are shown in Table 1, the precipitates of the Nb-containing compound contained in it, and the RE-containing compound (in this embodiment, RE selects Ce) and / or See Table 2 for the number of inclusions containing Ti compounds.
[0080] A method for manufacturing 500MPa grade niobium-containing rebar, comprising the following steps:
[0081] Step 1, molten steel smelting
[0082] Melt molten iron and steel scrap (by mass ratio, molten iron:scrap = 1:2) into molten steel in an electric furnace, tapping temperature 1640°C, carbon mass fraction 0.12%, oxygen mass fraction 0.05%, sulfur mass fraction 0.03% , when the mass fraction of phosphorus is 0.036%, silico-manganese is added in the process of tapping 1 / 3 to 3 / 4, and after tapping, the content of C, Si, and Mn element components in molten steel is adjusted to obtain molten steel;
[0083] Ste...
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