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Process for producing V-N micro alloy high strength steel band using thin plate blank continuously casting and continuously rolling technology

A thin slab continuous casting and micro-alloying technology, applied in metal rolling and other directions, can solve the problems of steel plate toughness and formability to be improved, achieve small difference in grain size, increase cooling rate, and prevent a large amount of dissolution and growth. Effect

Inactive Publication Date: 2007-10-31
GUANGZHOU PEARL RIVER STEEL & IRON
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because foreign V and V-N microalloy steels are mainly produced by precipitation strengthening technology, the toughness and formability of steel plates still need to be improved.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Chemical composition of molten steel: 0.03~0.04%C-0.2~0.3%Si-0.7~0.9%Mn-0.02~0.025%P-0.008~0.010%S-0.03~0.05%V-0.015-0.025%Alt-0.010~0.013% N. Process: Billet entering furnace temperature: 920-950°C; soaking temperature: 1130-1150°C; starting rolling temperature: 1000-1100°C; final rolling temperature: 840-860°C; coiling temperature: 550-600°C.

[0042] The grain size and mechanical properties of the steel strip are shown in Table 4.

[0043] Strip thickness

Embodiment 2

[0045] Chemical composition of molten steel: 0.05~0.06%C-0.02~0.05%Si-1.2~1.4%Mn-0.015~0.020%P-0.003~0.008%S-0.06~0.10%V-0.015-0.025%Alt-0.0~0.018% N.

[0046] Process: Billet entering furnace temperature: 950-1000°C; soaking temperature: 1100-1140°C; starting rolling temperature: 1000-1100°C; final rolling temperature: 840-860°C; coiling temperature: 550-600°C.

[0047] The grain size and mechanical properties of the steel strip are shown in Table 5.

[0048] Strip thickness

Embodiment 3

[0050] Chemical composition of molten steel: 0.06~0.08%C-0.2~0.5%Si-1.4~1.6%Mn-0.015~0.020%P-0.001~0.004%S-0.013~0.15%V-0.030-0.05%Alt-0.022~0.025% N.

[0051] Process: Billet entering furnace temperature: 900-950°C; soaking temperature: 1100-1130°C; starting rolling temperature: 1000-1100°C; final rolling temperature: 840-860°C; coiling temperature: 550-600°C.

[0052] The grain size and mechanical properties of the steel strip are shown in Table 6.

[0053] Strip thickness

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Abstract

The continuous thin plate blank casting and rolling process for producing high strength V-N micro alloy steel belt includes smelting and refining in electric furnace or converter, continuous casting, heating after solidification inside bottom heating furnace, hot rolling, laminated flow cooling and winding. The continuous thin plate blank casting and rolling process has the technological parameters of: furnace entering temperature of cast blank 900-1050 deg c, homogeneous heating temperature 1050-1250 deg c, initially rolling temperature 1000-1170 deg c, finally rolling temperature 840-950 deg c and winding temperature 530-670 deg c. The molten steel contains: C 0.03-0.08 wt%, Si 0.01-0.8 wt%, Mn 0.1-2.0 wt%, V 0.01-0.20 wt%, Al 0.01-0.06 wt% and N 0.002-0.03 wt%. The produced high strength and fine grain steel belt and plate has ferrite grain size smaller than 6.0 micron, yield strength of 420-700 MPa, and excellent toughness, welding performance and forming performance.

Description

technical field [0001] The invention belongs to the field of alloy steel production technology, and is particularly suitable for the production of high-strength steel strips with yield strength ≥ 420 MPa and requiring fine grain structure, good toughness, welding and forming properties by adopting thin slab continuous casting and rolling technology. Background technique [0002] Thin slab continuous casting and rolling is a high-efficiency production technology for hot-rolled wide-band steel developed in the late 1980s. , continuous rolling, cooling and coiling processes are organically combined, so that the investment in hot-rolled strip production is reduced, the production pace is accelerated, and energy consumption is reduced. It is an "economical and environmentally friendly" hot-rolled strip production with high efficiency. Way. [0003] Micro-alloyed high-strength steel is a high-tech, high-value-added product in hot-rolled strip steel. Nb, V, Ti microalloying techn...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21B1/46C22C38/12
Inventor 张若生毛新平刘清友李烈军林振源高吉祥柴毅忠李绍康杨才福陈学文许传棻钟志永
Owner GUANGZHOU PEARL RIVER STEEL & IRON
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