Vanadium-titanium containing carbon steel and manufacturing method thereof

A manufacturing method and carbon steel technology, applied in the field of carbon steel and its manufacturing, can solve the problems of steel failure, reduce impact resistance, increase the aging of steel, etc., and achieve the effect of avoiding the existence of free nitrogen

Inactive Publication Date: 2012-09-05
PANGANG GROUP VANADIUM TITANIUM & RESOURCES +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, too low Alt will cause a certain amount of free nitrogen in the steel, increase the timeliness of the steel, reduce the impact resistance, and seriously cause premature failure of the steel

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0074] Add 140 tons of molten iron into a converter with a nominal capacity of 120 tons (the actual tapping capacity is 125 to 135 tons), and use the function of oxygen blowing and decarburization of the converter to initially smelt the molten iron into molten steel. When the molten steel is initially smelted until the C content is 0.05%, the P content is 0.011%, the S content is 0.010%, the Si content is 0.02%, and the Mn content is 0.03%, the steel is tapped into the ladle. The amount of molten steel after converter smelting is 133 tons.

[0075] In the tapping process, add 350kg of FeAl (aluminum content is 40%, the rest is Fe) that can remove the oxygen content of molten steel to below 0.0020% to the ladle, and FeSi (Si content is 73%, the rest is Fe) 500kg and Metal Mn (Mn content is 98%, the rest is Fe) 660kg. After the addition, the actual oxygen content of the molten steel measured by an oxygen meter was 0.0015%, and the contents of Si and Mn in the molten steel incre...

example 2

[0080] Add 140 tons of molten iron into a converter with a nominal capacity of 120 tons (the actual tapping capacity is 125 to 135 tons), and use the function of oxygen blowing and decarburization of the converter to initially smelt the molten iron into molten steel. When the molten steel is initially smelted until the C content is 0.10%, the P content is 0.014%, the S content is 0.015%, the Si content is 0.05%, and the Mn content is 0.08%, the steel is tapped into the ladle. The amount of molten steel after converter smelting is 133 tons.

[0081] During the tapping process, add 350kg of FeAl (aluminum content is 40%, the rest is Fe) that can remove the oxygen content of molten steel to below 0.0020% to the ladle, and FeSi (Si content is 73%, the rest is Fe) 320kg and Metal Mn (Mn content is 98%, the rest is Fe) 810kg. After the addition, the actual oxygen content of the molten steel measured by an oxygen meter was 0.0017%, and the contents of Si and Mn in the molten steel i...

example 3

[0086] Add 135 tons of molten iron into a converter with a nominal capacity of 120 tons (the actual tapping amount is 125 to 135 tons), and use the function of oxygen blowing and decarburization of the converter to initially smelt the molten iron into molten steel. When the molten steel is initially smelted until the C content is 0.08%, the P content is 0.010%, the S content is 0.008%, the Si content is 0.02%, and the Mn content is 0.05%, the steel is tapped into the ladle. The amount of molten steel after converter smelting is 128 tons.

[0087] During the tapping process, 350kg of FeAl (aluminum content is 40%, the rest is Fe) and 720 kg of FeSi (Si content is 73%, the rest is Fe), which can remove the oxygen content of molten steel to below 0.0020%, is added to the ladle. Metal Mn (Mn content is 98%, the rest is Fe) 470kg. After the addition, the actual oxygen content of the molten steel measured by an oxygen meter was 0.0016%, and the contents of Si and Mn in the molten s...

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PUM

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Abstract

The invention provides vanadium-titanium containing carbon steel and a manufacturing method thereof. The manufacturing method comprises the following steps of: primarily smelting to obtain molten steel; discharging steel to a steel ladle when the content of C in the molten steel is 0.05-0.10 percent, the content of P is not more than 0.015 percent, and the content of S is not more than 0.020 percent; in the process of discharging the steel, regulating the content of Si of the molten steel to be 0.17-0.37 percent, the content of Mn to be 0.35-0.65 percent and the content of oxygen of the molten steel to be below 0.0020 weight percent; controlling the content of Als of the molten steel to be 0.015-0.025 percent, wherein Als represents acid soluble aluminum; regulating the content of oxygen of the molten steel in a steel ladle refining furnace to be below 0.0010 percent; regulating the content of Ti of the molten steel to be 0.005-0.010 percent and the content of V to be 0.02-0.04 percent; and regulating the content of C of the molten steel to be 0.17-0.23 percent so as to obtain the carbon steel, wherein the carbon steel contains the following components in percentage by weight: 0.17-0.23 percent of C, 0.17-0.37 percent of Si, 0.35-0.65 percent of Mn, 0.005-0.010 percent of Ti, 0.005-0.010 percent of Als, 0.02-0.04 percent of V and the balance of Fe and unavoidable impurities.

Description

technical field [0001] The invention relates to a carbon steel and a manufacturing method thereof, in particular to a vanadium-titanium-containing carbon steel that can be used in a high-pressure boiler and a manufacturing method thereof. Background technique [0002] 20G steel is a typical high-quality carbon structural steel for high-pressure boilers in the Chinese national standard GB5310-2008 (seamless steel pipes for high-pressure boilers), which contains 0.17% to 0.23% of C, 0.17% to 0.37% of Si, 0.35% to 0.65% of Mn, not more than 0.025% of P, not more than 0.015% of S, not more than 0.20% of Cu, not more than 0.25% of Cr, not more than 0.25% of Ni, not more than 0.15% of Mo and V not greater than 0.08%. [0003] Research and production practices have shown that aluminum in steel has a great influence on the quality of 20G steel, and the key to producing 20G steel is how to control Alt (full aluminum) in steel. For example, "Quality Control of 20g High-Pressure Boil...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/14C22C38/50C22C38/28
Inventor 刘明陈靓康斌邓通武刘昌恒杨洪波雷秀华代华云
Owner PANGANG GROUP VANADIUM TITANIUM & RESOURCES
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