A smelting method for producing φ12-25mmhrb500e straight bars by microalloying
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A smelting method and microalloying technology, applied in the field of metallurgy, can solve problems such as brittle fracture of steel bars and increased quality risks
Active Publication Date: 2022-06-21
XINJIANG BAYI IRON & STEEL
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Adding Cr and Mn at the same time can improve the strength, but it will also cause non-ferrite pearlite structure in the steel structure, which will easily cause brittle fracture of the steel bar when it is bent, and increase the quality risk
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[0027]A smelting method for producing Φ12-25mmHRB500E straight steel bars by microalloying. %, P: ≤0.04%, N: 0.01~0.015%, Ti: 0.03~0.05%, V: 0.05~0.07%, Cr: 0.1~0.3%, the sum of the mass percentages of Cr+Mn ≤1.55%, Ceq ≤0.54%; smelting method: adding pre-deoxidized composite slag lotion in converter tapping, the mass percentage composition of the slag lotion is: fluorite 5-10%, calcium carbide 65-75%, limestone 15-25%; Ti, V-composite micro-alloying smelting process technology and process steps, control the timing of adding Ti iron and the application of new materials to increase N in molten steel, that is, the application of high-nitrogen composite strengtheners, control high Si content, add Cr, reduce Mn, and realize Ti, V composite micro Alloy production of small size Φ12-25mmHRB500E straight steel bars: the carbon content at the end of the converter is less than or equal to 0.06%, and the amount of pre-deoxidized composite slag lotion is 2.0 kg / t; The dosage of agent add...
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Abstract
The invention discloses a smelting method for producing Φ12-25mm HRB500E straight steel bar by microalloying. The chemical composition of the steel bar is: C: 0.19-0.25%, Si: 0.60-0.80%, Mn: 1.10-1.4%, S: ≤0.04%, P: ≤0.04%, N: 0.01~0.015%, Ti: 0.03~0.05%, V: 0.05~0.07%, Cr: 0.1~0.3%, the sum of the mass percentages of Cr+Mn≤1.55% , Ceq≤0.54%; smelting method: add pre-deoxidation composite slag lotion to the converter tapping, the mass percentage composition of the slag lotion is: 5‑10% fluorite, 65‑75% calcium carbide, 15‑25% limestone; converter Add pre-deoxidation composite slag lotion after tapping, and then add silicon-manganese alloy, ferrosilicon, and high-carbon ferrochromium alloy in sequence. All alloys must be added at 1 / 3 of tapping, and all alloys should be added at 3 / 4 of tapping. Finished, the high nitrogen composite strengthener is added after the addition of the converter alloy, the addition amount is 0.6-0.8kg / t, and its composition: N 12-20%, Ti 18-25%, after the titanium-iron and vanadium-nitrogen alloys are added Carry out soft blowing, the soft blowing effect can be as large as 100-200mm in diameter of exposed molten steel after breaking the steel slag.
Description
technical field [0001] The invention belongs to the technical field of metallurgy, and relates to a smelting method for producing Φ12-25mm HRB500E straight steel bars by microalloying with Ti, V, N and Cr that meets the requirements of the GB / T1499.2-2018 standard. Background technique [0002] HRB500E is a steel grade specified in GB / T1499.2-2018 "Reinforced Concrete Reinforced Steel Part 2: Hot-Rolled Ribbed Steel Bar", formerly known as Grade 4 threaded steel bar, is a kind of high-strength earthquake-resistant steel bar, which is currently used in high-rise buildings and ultra-high-rise buildings. High-strength steel bars used in high-rise buildings. In GB / T1499.2-2018, the upper limit of C, Si, Mn, P, S elements and the upper limit of Ceq (carbon equivalent) are specified, and V, Nb, Ti and other elements can be added as needed; the N content in the steel is also specified. It should be no more than 0.012%. If there is a sufficient amount of N binding elements in the s...
Claims
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