Method for improving utilization ratio of V-N micro-alloying high-strength steel vanadium alloy

A technology of micro-alloying, high-strength steel, applied in the field of low-alloy steel production, can solve the problem of not putting forward the concept of V/N ratio, and achieve the effect of improving product competitiveness and reducing production cost

Inactive Publication Date: 2008-04-16
GUANGZHOU PEARL RIVER STEEL & IRON
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the concept of V/N r...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Chemical composition of molten steel: 0.045%C-0.45%Si-1.65%Mn-0.015%P-0.004%S-0.27%Cu-0.18%Ni-0.65%Cr-0.100%V-0.025%Alt-0.025%N. V / N ratio control: V / N=4.

[0016] Process: Billet entering furnace temperature: 950-1000°C; soaking temperature: 1140-1160°C; starting rolling temperature: 1050-1100°C; final rolling temperature: 860-880°C; coiling temperature: 580-620°C.

[0017] The grain size and mechanical properties of the steel strip are shown in Table 1.

[0018] Table 1 Grain size and mechanical properties of steel strip in Example 1

[0019] Strip thickness

[0020] This steel is a 700MPa grade high-strength weathering steel. Before controlling the V / N ratio, the composition is controlled at 0.150% V-0.020% N, and the V / N ratio = 7.5. If V / N is increased, the production of high-strength weathering steel of the same strength level can reduce The amount of V (0.150%-0.100%) / 0.100%=50%.

Embodiment 2

[0022] Chemical composition of molten steel: 0.06%C-0.25%Si-1.6%Mn-0.020%P-0.003%S-0.120%V-0.035%Alt-0.024%N. V / N ratio control: V / N=5.

[0023] 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: 580-600°C.

[0024] The grain size and mechanical properties of the steel strip are shown in Table 2.

[0025] Grain size and mechanical properties of table 2 embodiment 2 steel strip

[0026] Strip thickness

[0027] This steel is a 700MPa grade high-strength structural steel. Before controlling the V / N ratio, the composition is controlled to 0.170% V-0.020% N, and the V / N ratio = 8.5. By increasing V / N, the production of high-strength weathering steel of the same strength level can reduce The amount of V (0.170%-0.120%) / 0.120%=41.7%.

Embodiment 3

[0029] Chemical composition of molten steel: 0.055%C-0.015%Si-1.2%Mn-0.008%P-0.004%S-0.085%V-0.025%Alt-0.015%N. V / N ratio control: V / N=6.

[0030] 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.

[0031] The grain size and mechanical properties of the steel strip are shown in Table 3.

[0032] Grain size and mechanical properties of table 3 embodiment 3 steel strip

[0033] Strip thickness

[0034] This steel is a 500MPa grade high-strength structural steel. Before controlling the V / N ratio, the composition is controlled at 0.115%V-0.012%N, and the V / N ratio=9.6. Increasing V / N can reduce the production of high-strength weathering steel of the same strength level. The amount of V (0.115%-0.085%) / 0.085%=35.3%.

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Abstract

The invention discloses a method for improving the utility ratio of V-N micro-alloying high strength steel vanadium alloy, which aims at molten steel chemical composition range of V-N micro alloy high strength steel to control the V/N ratio within more than or equal to 4 and less than or equal to 6. The separation quantity of vanadium carbonitride in V-N micro-alloying high strength steel is increased through controlling the V/N ratio, thereby reducing using amount of alloy element V and improving the alloy utility ratio of V. The invention has the advantages that: the manufacturing process is easy to control, the comprehensive performances of steel plate can be stably acquired and simultaneously the adding quantity of vanadium can be reduced by 35 percent to 50 percent through controlling V/N ratio, thereby reducing alloying production cost and improving competitive strength of products.

Description

technical field [0001] The invention belongs to the technical field of low-alloy steel production, and in particular relates to a method for improving the utilization rate of V-N micro-alloyed high-strength steel-vanadium alloy based on thin-slab continuous casting and rolling processes. Background technique [0002] V-N microalloying technology is currently an important field for the production of high-strength low-alloy and micro-alloy steels. Thin slab continuous casting and rolling enterprises in North America widely use V-N microalloying technology to produce low-alloy high-strength steel. The first thin slab continuous casting and rolling production line of Guangzhou Zhujiang Iron and Steel Co., Ltd. (hereinafter referred to as Zhugang) has developed a process for producing V-N micro-alloyed high-strength steel strips based on the thin slab continuous casting and rolling process (patent application number: 200510100421.2) , A method for producing V-N microalloyed high...

Claims

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Application Information

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IPC IPC(8): C22C33/04C22C38/12C22C38/24C22C38/38C22C38/46C22C38/58
Inventor 毛新平高吉祥陈麒琳
Owner GUANGZHOU PEARL RIVER STEEL & IRON
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