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A kind of rebar containing Ti and preparation method thereof

A technology of rebar and molten steel, which is applied in the field of alloy steel, can solve the problems of rebar with many chemical components, complex adjustment of chemical composition, and various performances to be improved, so as to achieve the effect of eliminating internal defects and uniform grain distribution

Active Publication Date: 2020-06-19
福建三宝钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the final rebar produced has many chemical components, and the adjustment of chemical components is more complicated, and various properties need to be improved.

Method used

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  • A kind of rebar containing Ti and preparation method thereof
  • A kind of rebar containing Ti and preparation method thereof
  • A kind of rebar containing Ti and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] A Ti-containing rebar, including the following chemical composition in weight percentage: C: 0.20%, Si: 0.40%, Mn: 1.20%, Ti: 0.015%, Nb: 0.015%, P: 0.045%, S: 0.045%.

[0061] The preparation method of above-mentioned screw steel, comprises the steps:

[0062] (1) Converter smelting: add steel scrap, supply oxygen (oxygen pressure 0.8MPa, gun position 1.4m), add 1.2wt% lime (accounting for the weight fraction of scrap steel) to make slag, blow argon gas at the bottom of the whole process, the flow rate is 60NL / min, the end point For temperature measurement and sampling, first add a deoxidizer to deoxidize. The main components of the deoxidizer are Si: 0.4%, Ca: 4%, Al: 15%, and silicon-manganese, ferrosilicon, ferro-niobium and ferro-titanium are added for alloying, and the steel is tapped for 1 / 5 starts to add alloy, and all the addition is completed before 3 / 4 of the steel is tapped. The order of alloy addition is silicomanganese-ferrosilicon-ferro-niobium-ferro-tit...

Embodiment 2

[0068] A Ti-containing rebar, including the following chemical composition in weight percentage: C: 0.25%, Si: 0.55%, Mn: 1.40%, Ti: 0.025%, Nb: 0.020%, P: 0.025%, S: 0.025%.

[0069] The preparation method of above-mentioned screw steel, comprises the steps:

[0070] (1) Converter smelting: add molten iron, supply oxygen (oxygen pressure 0.9MPa, gun position 1.8m), add 2.8wt% lightly burned dolomite (accounting for the mass fraction of molten iron) to make slag, and blow argon gas at the bottom during the whole process, with a flow rate of 100NL / Min, temperature measurement and sampling at the end point, first add a deoxidizer to deoxidize, the main components of the deoxidizer are Si: 0.6%, Ca: 6%, Al: 18%, then add silicomanganese, ferrosilicon, ferro-niobium and ferro-titanium for alloying, Alloys start to be added at 1 / 5 of the steel, and all are added before 3 / 4 of the steel is tapped. The order of alloy addition is silicomanganese-ferrosilicon-ferro-niobium-ferro-titan...

Embodiment 3

[0076] A Ti-containing rebar, including the following chemical composition in weight percentage: C: 0.22%, Si: 0.45%, Mn: 1.30%, Ti: 0.020%, Nb: 0.018%, P: 0.035%, S: 0.035%.

[0077] The preparation method of above-mentioned screw steel, comprises the steps:

[0078] (1) Converter smelting: add scrap steel and molten iron, supply oxygen (oxygen pressure 0.85MPa, gun position 1.6m), add 2.0wt% magnesium balls (accounting for the percentage of the total mass of scrap steel and molten iron) to make slag, and blow argon gas at the bottom of the whole process, Flow rate is 80NL / min, temperature measurement and sampling at the end point, first add deoxidizer for deoxidation, the main components of deoxidizer are Si: 0.5%, Ca: 5%, Al: 16%, then add silicomanganese, ferrosilicon, ferro-niobium and ferro-titanium Carry out alloying, start to add alloys at 1 / 5 of the tapping, and complete the addition before 3 / 4 of the tapping, the order of alloy addition is silicomanganese-ferrosilico...

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Abstract

The invention relates to the technical field of alloy steel, in particular to Ti-contained screw-thread steel and a preparation method of the Ti-contained screw-thread steel. The Ti-contained screw-thread steel comprises, by weight, 0.20-0.25% of C, 0.40-0.55% of Si, 1.20-1.40% of Mn, 0.015-0.025% of Ti, 0.015-0.020% of Nb, not larger than 0.045% of P and not larger than 0.045% of S. The Ti-contained screw-thread steel has the advantages of high strength, low cost and corrosion resistance.

Description

technical field [0001] The invention relates to the technical field of alloy steel, in particular to a Ti-containing threaded steel and a preparation method thereof. Background technique [0002] Rebar is a common name for hot-rolled ribbed steel bars. Usually with 2 longitudinal ribs and transverse ribs evenly distributed along the length. The shape of the transverse rib is spiral, herringbone and crescent. Expressed in millimeters of nominal diameter. The nominal diameter of a ribbed steel bar is equivalent to the nominal diameter of a smooth round steel bar of equal cross-section. The ribbed steel bar mainly bears the tensile stress in the concrete. Due to the effect of the ribs, it has a greater bonding capacity with the concrete, so it can better withstand the action of external forces. The grade of ordinary hot-rolled steel bar is composed of HRB and the minimum yield point of the grade. H, R, and B are the English initials of the three words Hotrolled, Ribbed, an...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/14C22C38/12C22C33/06C21C7/06C21D8/08C21D1/26C21D1/18
CPCC21C7/06C21D1/18C21D1/26C21D8/08C22C33/06C22C38/02C22C38/04C22C38/12C22C38/14
Inventor 陈贵和涂文兴张盛梁
Owner 福建三宝钢铁有限公司
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