Production process of Nb-containing mill coil for automobile

A production process and narrow strip steel technology, applied in the field of metallurgy, can solve problems such as TiN inclusions, achieve the effects of less inclusions, improved toughness, and increased strength

Inactive Publication Date: 2010-08-04
NANJING IRON & STEEL CO LTD
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  • Summary
  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the problem that TiN inclusions are easily generated when Ti is added in the prior art, the object of the present invention is to provide a production process for hot-rolled narrow strip steel for automobiles containing Nb, which has the advantages of simple production process, low energy consumption, low equipment investment, and production High efficiency, good product quality, improved toughness while increasing strength, and better comprehensive mechanical properties

Method used

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Embodiment Construction

[0014] A production process of TL1114Nb hot-rolled narrow strip steel for automobiles, including the following processes: raw material preparation, EAF eccentric bottom tapping electric arc furnace smelting, LF refining outside the furnace, VD vacuum degassing treatment, CCM continuous casting, continuous casting slab throwing Shot, flaw detection, heating, 3 / 4 continuous rolling, coiling steel strip.

[0015] Among them, the raw material preparation process: the furnace charge is composed of high-quality scrap steel, molten iron and pig iron, and the total amount of harmful residual elements is controlled within 0.15%; the amount of molten iron added to each furnace is greater than 40%; all raw materials entering the furnace are kept dry, and the alloy is added after baking.

[0016] EAF electric furnace smelting process: before tapping, the carbon content is ≤0.06%, and the phosphorus content is ≤0.008%; the compound medium aluminum deoxidizer adopts low-carbon ferromanganese...

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PUM

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Abstract

The invention discloses a production process of a Nb-containing mill coil for automobile; the production process comprises the following working procedures: raw material preparation, EAF eccentric bottom tapping arc furnace smelting, LF external refining, VD vacuum arc degassing processing, CCM continuous casting, continuous-casting shot blasting, fault detection, heating, 3/4 continuous system rolling and curling steel belt; in the invention, Nb is used as microalloying element and has obvious refined grain action; the toughness is improved while improving intensity, the cold bending property is good and the integrated mechanical property is high; continuous casting production process is adopted, rolling in one heat is used, the energy consumption is low, the production period is short and the comprehensive rolling yield is high.

Description

technical field [0001] The invention belongs to the field of metallurgy and relates to a production process of Nb-containing hot-rolled narrow strip steel for automobiles. Background technique [0002] The steel for hot-rolled automobile beams is mainly used to manufacture the frame (chassis) of automobiles, and the steel for longitudinal beams and cross beams of the car is mainly low-alloy steel and carbon steel. Steel for automobile girders is an important load-bearing part and safety part for automobile structure. The forming and manufacturing process is complicated, and the material requires high strength, toughness, cold bending and fatigue resistance. At present, wide-band steel is used for shearing to produce hot-rolled automobile beams in China, and there is no production process for narrow-strip steel. Compared with the production of narrow strip steel after shearing, the edge of narrow strip steel is a natural edge, and the comprehensive performance is better than...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/52C21C7/06C21C7/10B22D11/114B22D11/04B21B37/74
CPCY02P10/20
Inventor 朱俊虹马照红郜书忠俞日军
Owner NANJING IRON & STEEL CO LTD
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