390MPa grade cold-rolled phosphorus-containing IF high-strength steel strip and LF-RH duplex production process thereof

A LF-RH, production process technology, used in the manufacture of converters, lighting and heating equipment, bell-type furnaces, etc., can solve the problems of surface inclusion defects, high production costs, and long production cycles of steel strip products. The effect of reducing surface inclusion defects, shortening production cycle, and simplifying production process

Inactive Publication Date: 2018-11-20
GANSU JIU STEEL GRP HONGXING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the production cycle of this process is long, the production cost is high, and the castability of the conventional continuous casting process is poor, and there are inclusion defects on the surface of the produced steel strip product, and the yield ratio is high.

Method used

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  • 390MPa grade cold-rolled phosphorus-containing IF high-strength steel strip and LF-RH duplex production process thereof
  • 390MPa grade cold-rolled phosphorus-containing IF high-strength steel strip and LF-RH duplex production process thereof
  • 390MPa grade cold-rolled phosphorus-containing IF high-strength steel strip and LF-RH duplex production process thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] In this example, the composition of the steel strip in weight percentage is C: 0.0050%, Si: 0.0300%, Mn: 0.55%, P: 0.0700%, S: 0.0053%, Als: 0.0314%, Nb: 0.0500%, Ti: 0.0350 %, B: 0.0005%. The specific production process is as follows:

[0024] (1) Converter molten steel smelting: put the blast furnace molten iron into the converter, tapping C=0.044%, S=0.011%, O=0.0599%; the tapping temperature is 1678°C, no deoxidizer, alloy and synthetic slag are added during the tapping process of the converter and small lime;

[0025] (2) Refining of LF molten steel: transfer the molten steel obtained in the converter to the LF furnace to fix the oxygen, add 0.17kg of aluminum wire for every 0.0001% [O]; add 8.34kg of lime per ton of molten steel after the addition of aluminum wire, LF adopts micro positive pressure operation, Control the Als content in molten steel to 0.0089%, and the RH arrival temperature to 1653°C;

[0026] (3) RH molten steel refining: The molten steel is v...

Embodiment 2

[0034] The composition of the steel strip in this embodiment is calculated by weight percentage, C: 0.0048%, Si: 0.0430%, Mn: 0.60%, P: 0.0550%, S: 0.0042%, Als: 0.0400%, Nb: 0.0350%, Ti: 0.0207%, B: 0.0010%. The specific production process is as follows:

[0035] (1) Converter molten steel smelting: put the blast furnace molten iron into the converter, tapping C=0.056%, S=0.009%, O=0.0482%; the tapping temperature is 1675°C, no deoxidizer, alloy, synthetic slag is added during the tapping process of the converter and small lime;

[0036] (2) Refining of LF molten steel: transfer the molten steel obtained in the converter to the LF furnace to fix the oxygen, add 0.17kg of aluminum wire for every 0.0001% [O]; add 8.34kg of lime per ton of molten steel after the addition of aluminum wire, LF adopts micro positive pressure operation, Control the Als content in molten steel to 0.0097%, and the RH arrival temperature to 1651°C;

[0037] (3) RH molten steel refining: The molten s...

Embodiment 3

[0045] In this embodiment, the composition of the steel strip is calculated by weight percentage, C: 0.0047%, Si: 0.0550%, Mn: 0.588%, P: 0.0601%, S: 0.0080%, Als: 0.0200%, Nb: 0.0384%, Ti: 0.0150%, B: 0.0008%. The specific production process is as follows:

[0046] (1) Converter molten steel smelting: put blast furnace molten iron into converter, tapping C=0.042%, S=0.008%, O=0.0557%; tapping temperature is 1676°C, no deoxidizer, alloy and synthetic slag are added during the tapping process of converter and small lime;

[0047] (2) Refining of LF molten steel: Transfer the molten steel obtained in the converter to the LF furnace to fix the oxygen, add 0.17kg of aluminum wire for every 0.0001% [O]; add 8.34kg of lime per ton of molten steel after the addition of aluminum wire, and LF adopts micro positive pressure operation, Control the Als content in molten steel to 0.0093%, and the RH arrival temperature to 1656°C;

[0048] (3) RH molten steel refining: The molten steel i...

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Abstract

The invention discloses a 390MPa grade cold-rolled phosphorus-containing IF high-strength steel strip and an LF-RH duplex production process thereof, and belongs to the technical field of production of interstitial-free steel. The steel strip comprises, by weight, less than or equal to 0.0050% of C, 0.030-0.055% of Si, 0.55-0.60% of Mn, 0.055-0.070% of P, less than or equal to 0.008% of S, 0.020-0.040% of Als, 0.035-0.050% of Nb, 0.015-0.035% of Ti, 0.0005-0.0010% of B and the balance Fe, Ca, Cr and inevitable trace elements. The production process flow comprises the steps of blast furnace hotmetal smelting, converter molten steel smelting, LF molten steel refining, RH molten steel refining, CSP sheet billet continuous casting and rolling, pickling cold continuous rolling, cover furnace annealing, leveling and inspection, packaging and storage. The composition design thoughts of micro-carbon smelting, [Nb, Ti] microalloying and solid solution strengthening of P and Mn are adopted, the390MPa grade cold-rolled phosphorus-containing IF high-strength steel strip with stable chemical compositions and stable mechanical properties is obtained through an LF-RH duplex refining process, hot rolling, cold rolling and an annealing process, the production cycle is short, the production cost is low, the steel strip is stable in quality, and the requirements of the automobile industry on the high-strength steel strip can be met.

Description

technical field [0001] The invention belongs to the technical field of interstitial atom-free steel production, and relates to a 390MPa grade cold-rolled phosphorus-containing IF high-strength steel strip and its LF-RH duplex production process, especially to a CSP thin slab continuous casting and rolling production line and LF- 390MPa grade cold-rolled phosphorus-containing IF high-strength steel strip produced by RH duplex process and its new production process. Background technique [0002] IF steel, that is, interstitial atom-free steel, is to add strong carbonitride-forming elements such as niobium and / or titanium to the micro-carbon steel, and completely fix the interstitial atoms such as carbon and nitrogen in the micro-carbon steel into carbonitride compounds, thereby A pure ferritic steel without interstitial atoms is obtained. IF steel has been widely used in the field of automobile processing due to its excellent deep drawing properties. The 390MPa grade cold-ro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/28C21C7/00C21C7/068C21C7/10C21D1/26C21D6/00C21D8/02C21D9/663C22C38/02C22C38/04C22C38/06C22C38/26C22C38/28C22C38/32B22D11/111B21C37/02
Inventor 罗晓阳赵小龙赵占彪王强狄彦军王瑾李积鹏李发业马明胜苏晓智
Owner GANSU JIU STEEL GRP HONGXING IRON & STEEL CO LTD
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