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Low-cost and high-performance SPA-H hot rolled steel coil and preparation method thereof

A hot-rolled steel coil, high-performance technology, applied in the direction of manufacturing converters, improving process efficiency, etc., to achieve the effect of improving elongation, avoiding bending cracking problems, and good surface quality

Inactive Publication Date: 2017-07-14
NINGBO IRON & STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0017] The technical problem to be solved by the present invention is to provide a low-cost high-performance SPA-H hot-rolled steel coil and its preparation method. The SPA-H hot-rolled steel coil has excellent plasticity and toughness, improves cold working performance, and avoids SPA-H The problem of bending cracking caused by large deformation in the use of H steel coils can reduce quality objections; by adjusting the content of C and Cr in the composition of SPA-H steel, adjusting the content of Als, and adopting a suitable rolling process and controlled cooling process, the quality of SPA-H steel can be improved. Comprehensive performance to produce low-cost, high-performance SPA-H hot-rolled steel coils; direct loading of rolled steel production to achieve energy saving and emission reduction, the concept of green steel

Method used

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  • Low-cost and high-performance SPA-H hot rolled steel coil and preparation method thereof
  • Low-cost and high-performance SPA-H hot rolled steel coil and preparation method thereof
  • Low-cost and high-performance SPA-H hot rolled steel coil and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0051]After the composition is designed, the molten iron is pretreated, then smelted in a 180t converter, nitrogen and argon are switched, and the molten steel is tapped; blowing is performed once before tapping, and the tapping time is 5 minutes; the alloy is added before tapping 4 / 5; Double slag blocking, the slag thickness at the station is 80mm; ladle furnace making reduced slag operation, the processing time is 18 minutes, and the ladle is weakly blown with Ar (bright circle ≤ 200mm) for 6 minutes before the processing is completed; the ladle furnace processing is completed and the continuous casting ladle is poured for 12 minutes .

[0052] The weight percentages of the components of the above-mentioned molten steel after tapping are as follows: C 0.07%, Si 0.25%, Mn 0.38%, P 0.085%, S 0.006%, Cu 0.25%, Ni 0.08%, Cr 0.50%, Als 0.015% ; The rest is iron and unavoidable impurities.

[0053] The molten steel is continuously cast to obtain a slab, in which the liquidus temp...

Embodiment 2

[0058] After the composition is designed, the molten iron is pretreated, then smelted in a 180t converter, nitrogen and argon are switched, and the molten steel is tapped; the blowing is done once before tapping, and the tapping time is 6 minutes; the alloy is added before tapping 4 / 5; Double slag blocking, the slag thickness at the station is 80mm; the ladle furnace makes the reduced slag operation, the processing time is 20 minutes, and the ladle is weakly blown with Ar (bright circle ≤ 200mm) for 8 minutes before the end of the treatment; the time from the end of the refining treatment to the opening of the continuous casting ladle is 15 minutes.

[0059] The weight percentages of the components of the above-mentioned molten steel after tapping are as follows: C 0.08%, Si 0.30%, Mn 0.43%, P 0.090%, S 0.004%, Cu 0.27%, Ni 0.09%, Cr 0.55%, Als 0.020% ; The rest is iron and unavoidable impurities.

[0060] The molten steel is continuously cast to obtain a slab, in which the li...

Embodiment 3

[0065] After the composition is designed, the molten iron is pretreated, then smelted in a 180t converter, nitrogen and argon are switched, and the molten steel is tapped; blowing is performed once before tapping, and the tapping time is 8 minutes; the alloy is added before tapping 4 / 5; Double slag blocking, the slag thickness at the station is 80mm; the ladle furnace makes the reduced slag operation, the processing time is 22 minutes, and the ladle is weakly blown with Ar (bright circle ≤ 200mm) for 10 minutes before the end of the treatment; the time from the end of the refining treatment to the opening of the continuous casting ladle is 20 minutes.

[0066] The weight percentages of the components of the above-mentioned molten steel after tapping are as follows: C 0.095%, Si 0.35%, Mn0.48%, P 0.105%, S 0.007%, Cu 0.35%, Ni 0.20%, Cr 0.60%, Als 0.045% ; The rest is iron and unavoidable impurities.

[0067] The molten steel is continuously cast to obtain a slab, in which the ...

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Abstract

The invention relates to a low-cost and high-performance SPA-H hot rolled steel coil and a preparation method thereof. The low-cost and high-performance SPA-H hot rolled steel coil comprises, by mass, 0.07%-0.095% of C, 0.25%-0.35% of Si, 0.38%-0.48% of Mn, 0.085%-0.105% of P, 0.007% of S or the less, 0.25%-0.35% of Cu, 0.08%-0.20% of Ni, 0.50%-0.60% of Cr, 0.015%-0.045% of Als and the balance Fe and inevitable impurities. The preparation method comprises the steps of composition design, hot metal pretreatment, converter smelting, ladle furnace treatment, continuous casting, hot continuous rolling, laminar cooling and reeling, and the SPA-H hot rolled steel coil is obtained. The SPA-H hot rolled steel coil has excellent plasticity and toughness, cold processing performance is improved, the problem of bending cracking of large deformation in the using process of the SPA-H steel coil is avoided, quality objections are reduced, and comprehensive performance of SPA-H steel is improved.

Description

technical field [0001] The invention belongs to the field of hot-rolled steel coil and its preparation, in particular to a low-cost and high-performance SPA-H hot-rolled steel coil and its preparation method. Background technique [0002] Currently producing container steel with a yield strength of 350MPa, there are many cracks on the surface of the slab, the continuous casting is prone to steel breakage, insufficient strength margin, and low plasticity and toughness. Insufficient strength margin caused some steel coils to be rejected; there was a high probability of cracks on the surface of the casting slab and it could not be directly loaded, which was not conducive to energy saving and emission reduction; Conducive to the user's use. [0003] The results of the actual performance investigation on the production performance of SPA-H series steel coils are shown in Table 1 and Table 2: [0004] Table 1 SPA-H series steel thickness, performance range statistical table [...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/04C22C38/02C22C38/06C22C38/20C21C5/30C21C7/072C21C7/076C21D8/00
CPCC21C5/30C21C7/072C21C7/076C21D8/005C21D2211/005C21D2211/009C22C38/02C22C38/04C22C38/06C22C38/20Y02P10/20
Inventor 欧阳炜赵彦灵罗石念刘万善唐小勇李洪鹏周德锋丘祥光张军霞
Owner NINGBO IRON & STEEL
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