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Sheet slab C-Mn excellent high-strength sheet-band steel production process

A production process, thin slab technology, applied in the field of thin slab C-Mn plate and strip steel production process, can solve the problems affecting the economic benefits of enterprises, increasing production costs, etc.

Active Publication Date: 2008-07-23
HEBEI IRON AND STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The role of Nb, V, and Ti microalloys in steel is mainly to improve the structure and performance of products and increase the strength of products. However, adding Nb, V, and Ti microalloys to high-strength steel plates will inevitably increase production costs and affect enterprises. economic benefits

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0008] Embodiment 1: Production of C-Mn series automobile frame steel

[0009] The production process of the C-Mn series automobile beam steel of the present invention is: pure molten steel→thin slab continuous casting→heating→rough rolling→intermediate temperature control→finish rolling→laminar cooling→coiling→finished product, the composition of the steel is C: 0.193%; Mn: 1.213%; S≤0.0056%; P≤0.017%; Si≤0.316%; Als: 0.024%. The molten steel is injected into the tundish through the sliding nozzle at the bottom of the ladle. The temperature of the molten steel in the tundish is 1540°C. The molten steel in the tundish is injected into the mold through the flat submerged nozzle. The mold is a long funnel-shaped mold; the casting speed of the slab is 3.8m / min, the thickness of the casting slab out of the mold is 80mm, and the casting slab is pressed by a 10mm liquid core; the whole process of continuous casting is poured with inert gas protection. The casting slab is cooled, be...

Embodiment 2

[0011] Embodiment 2: Production of low-alloy high-strength structural C-Mn steel

[0012] The process of producing low-alloy high-strength structure C-Mn steel in the present invention is: pure molten steel→thin slab continuous casting→heating→rough rolling→intermediate temperature control→finish rolling→laminar cooling→coiling→finished product, the composition of the steel is C : 0.188%; Mn: 1.12%; S≤0.006%; P≤0.018%; Si≤0.355%; Als: 0.020%. The molten steel is injected into the tundish through the sliding nozzle at the bottom of the ladle. The temperature of the molten steel in the tundish is 1545°C. The molten steel in the tundish is injected into the mold through the flat submerged nozzle. The mold is a long funnel-shaped mold; the casting speed of the slab is 3.5m / min, the thickness of the slab exiting the crystallizer is 80mm, the above-mentioned slab is cooled, bent and straightened in the secondary cooling section, and then enters the tunnel type heating furnace. The ...

Embodiment 3

[0014] Embodiment 3: the production of C-Mn welded gas cylinder steel

[0015] The process of producing C-Mn welded gas cylinder steel in the present invention is: pure molten steel→thin slab continuous casting→heating→rough rolling→intermediate temperature control→finish rolling→laminar cooling→coiling→finished product, the composition of the steel is C: 0.17%; Mn: 0.70%; S≤0.005%; P≤0.015%; Si≤0.08%; Als: 0.025%. The molten steel is injected into the tundish through the sliding nozzle at the bottom of the ladle. The temperature of the molten steel in the tundish is 1540°C. The molten steel in the tundish is injected into the mold through the flat submerged nozzle. The mold is a long funnel-shaped mold; the casting speed of the slab is 4.2m / min, the thickness of the slab exiting the crystallizer is 72mm, the above-mentioned slab is cooled, bent and straightened in the secondary cooling section, and then enters the tunnel type heating furnace. The cast slab out of the soaking...

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Abstract

The present invention relates to a process of producing high-quality high-strength sheet steel by utilizing sheet billet and adopting continuous casting and continuous rolling process. Its technical scheme is as follows: (1) chemical components of steel are: C is 0.16-0.20%, Mn is 0.6-1.70%, S is less than or equal to 0.010%; P is less than or equal to 0.025%, Si is less than or equal to 0.55%, Als is 0.010-0.040%, Ca / Als is greater than or equal to 0.10, T(o) is less than or equal to 30 ppm, and N is less than or equal to 60 ppm; (2) sheet billet continuous casting: molten steel temperature of intermediate tank is 1530-1550 deg.C, pulling rate of casting blank is 3.0-4.5 m / min, thickness of casting blank outgoing from crystallizer is 70-85mm; (3) heating; temperalure of feeding casting blank into furnace is 900-1000 deg.C and the tapping temperature is 1100-1150 deg.C; (4) rolling; initial rolling temperature is 1050-1110 deg.C and final rolling temperature of fine rolling is 850-900 deg.C.

Description

Technical field: [0001] The invention relates to a process for producing high-strength plate and strip steel by continuous casting and rolling of thin slabs. Background technique: [0002] Thin slab continuous casting and rolling production line is a short process newly developed in the world in the early 1990s to successfully produce hot-rolled coils. It is one of the most important revolutionary technologies in the iron and steel industry after oxygen converter steelmaking and continuous steel casting. . Compared with the traditional hot-rolled coil production process, due to its unique process and characteristics, the products produced by thin slab continuous casting and rolling have fine grains and high strength, which are suitable for the production of high-strength steel plates. For example, automobile girder plates are mainly used to manufacture automobile frames. Since the automobile is subjected to complex stresses such as various impacts and torsions during the d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21B1/46
Inventor 陈礼斌孔庆福刘明哲史东日刘建华齐长发尹绍江关玉佐孙晓玲辛凤英徐杰董欣欣
Owner HEBEI IRON AND STEEL
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