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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, increase the ageing of steel, reduce impact resistance, etc., and achieve the effect of avoiding the existence of free nitrogen

Inactive Publication Date: 2011-04-27
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] Put 140 tons of molten iron into a converter with a nominal capacity of 120 tons (the actual tapping volume is 125 tons to 135 tons), and use the converter's oxygen blowing and decarburization function to make the molten iron into molten steel. When the molten steel is initially refined to a C content of 0.05%, a P content of 0.011%, a S content of 0.010%, a Si content of 0.02%, and a Mn content of 0.03%, tapping into the ladle begins. The amount of molten steel after converter smelting is 133 tons.

[0075] During the tapping process, add 350kg of FeAl (aluminum content is 40%, the rest is Fe), and 500kg of FeSi (Si content is 73%, the rest is Fe) that can remove the oxygen content of molten steel to less than 0.0020%. Metal Mn (98% Mn content, the rest is Fe) 660 kg. After the addition, the actual oxygen content of the molten steel measured by the oxygen meter was 0.0015%, and the Si and Mn contents of the molten steel increased to 0.24% and 0.48% respectively. Then, 2...

example 2

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

[0081] During the tapping process, 350kg of FeAl (aluminum content is 40% and the rest is Fe) that can remove the oxygen content of molten steel to less than 0.0020%, and 320kg of FeSi (73% Si content and the rest is Fe) are added to the ladle. Metal Mn (98% Mn content, the rest is Fe) 810kg. After the addition, the actual oxygen content of the molten steel measured by the oxygen meter was 0.0017%, and the Si and Mn contents of the molten steel increased to 0.19% and 0.63%, ...

example 3

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

[0087] During the tapping process, add 350kg of FeAl (40% aluminum content and Fe), and 720kg FeSi (73% Si content and Fe) that can remove the oxygen content of molten steel to less than 0.0020% into the ladle. Metal Mn (98% Mn content, the rest is Fe) 470kg. After the addition, the actual oxygen content of the molten steel measured by the oxygen meter was 0.0016%, and the content of Si and Mn in the molten steel increased to 0.35% and 0.38% respectively. Then, ...

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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 carbon steel containing vanadium and titanium 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 Tubes for High-pressure Boilers). It contains 0.17% to 0.23% C and 0.17% to 0.37% by weight. Si, 0.35%~0.65% Mn, not more than 0.025% P, not more than 0.015% S, not more than 0.20% Cu, not more than 0.25% Cr, not more than 0.25% Ni, not more than 0.15% Mo and V not more than 0.08%. [0003] Research and production practices have shown that aluminum in steel has a great influence on the quality of 20G steel. The key to producing 20G steel is how to control Alt (all aluminum) in steel. For example, "Quality Control of Seamless Tubes for 20g High Pressure Boilers" (《Stee...

Claims

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Application Information

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Patent Type & Authority Applications(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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