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Alloy steel and manufacture method thereof

A manufacturing method and alloy steel technology, which are applied to the alloy steel of high pressure boilers and its manufacturing field, can solve the problems of reducing impact resistance, steel failure, and increasing the aging of steel, and achieve low Al content and reduce aging. Effect

Inactive Publication Date: 2011-04-06
PANGANG GROUP VANADIUM TITANIUM & RESOURCES +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This part of nitrogen is fixed by Al, otherwise nitrogen will exist in the steel in the form of free state, which will increase the timeliness of the steel, reduce the impact resistance, and seriously cause premature failure of the steel
[0006] As mentioned above, in the existing 15CrMoG steel production technology, the low Al route should be adopted; however, too low Al content will cause a certain amount of free nitrogen in the steel, which will increase the timeliness of the steel, reduce the impact resistance, and seriously can also cause premature failure of the steel

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0081] 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 to a C content of 0.03%, a P content of 0.011%, a S content of 0.010%, a Si content of 0.02%, a Mn content of 0.03%, a Cr content of 0.05%, and a Mo content of 0.03%, it begins to Ladle tapping. The amount of molten steel after converter smelting is 133 tons.

[0082] 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%, and FeSi (Si content is 73%, the rest is Fe) 500kg, Metal Mn (Mn content is 98%) 660kg, low carbon ferrochrome (Cr content is 66%) 1670kg and molybdenum iron (Mo content is 59%) 875kg. After the addition, the actual oxygen content of the molten steel measu...

example 2

[0087] 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 molten steel is initially smelted to a C content of 0.04%, a P content of 0.014%, a S content of 0.019%, a Si content of 0.02%, a Mn content of 0.04%, a Cr content of 0.05%, and a Mo content of 0.04%, it begins to Ladle tapping. The amount of molten steel after converter smelting is 133 tons.

[0088] During the tapping process, add 320kg of FeAl (aluminum content is 40%, the rest is Fe) and FeSi (Si content is 73%, the rest is Fe) 390kg, which can remove the oxygen content of molten steel to below 0.0020% Metal Mn (Mn content is 98%) 940kg, low carbon ferrochrome (Cr content is 66%) 1800kg and molybdenum iron (Mo content is 59%) 920kg. After the addition, the actual oxygen content of the molten steel measu...

example 3

[0093] 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 to a C content of 0.06%, a P content of 0.010%, a S content of 0.008%, a Si content of 0.02%, a Mn content of 0.05%, a Cr content of 0.05%, and a Mo content of 0.04%. Ladle tapping. The amount of molten steel after converter smelting is 128 tons.

[0094] During the tapping process, 350 kg of FeAl (aluminum content of 40%, the remainder being Fe), 720 kg of FeSi (Si content of 73%, and the remainder being Fe), which can remove the oxygen content of molten steel to below 0.0020%, are added to the ladle. Metal Mn (Mn content is 98%) 720kg, low carbon ferrochrome (Cr content is 66%) 2000kg and molybdenum iron (Mo content is 59%) 830kg. After the addition, the actual oxygen c...

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PUM

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Abstract

The invention provides alloy steel and a manufacture method thereof. The manufacture method comprises the steps of: initially melting molten steel; when C content is 0.03-0.06 percent, P content is not more than 0.015 percent and S content is not more than 0.020 percent, tapping to a steel ladle; during the tapping, regulating the Si content to be 0.17-0.37 percent, the Mn content to be 0.40-0.70 percent, the Cr content to be 0.80-1.10 percent and the Mo content to be 0.40-0.55 percent, and regulating the oxygen content of molten steel to be below 0.0020 percent; controlling the Als content to be 0.015-0.025 percent in a steel ladle refining furnace, wherein Als expresses acid-soluble aluminum; regulating the oxygen content of the molten steel to be below 0.0010 percent in the steel ladle refining furnace; regulating the Ti content of the molten steel to be 0.005-0.010 percent and the V content to be 0.02-0.04 percent in the refining process, the C content of the molten steel to be 0.12-0.18 percent after the refining is finished so as to obtain the alloy steel, wherein the alloy steel comprises the following components in percent by weight of 0.12-0.18 percent of C, 0.17-0.37 percent of Si, 0.40-0.70 percent of Mn, 0.80-1.10 percent of Cr, 0.40-0.55 percent of Mo, 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 inevitable impurities.

Description

technical field [0001] The invention relates to an alloy steel and a manufacturing method thereof, in particular to an alloy steel which can be used in a high-pressure boiler and a manufacturing method thereof. Background technique [0002] Studies have shown that controlling the Al content of boiler steel in a very low range is the key to the production of boiler steel. The main reason is that high Al content will lead to extremely low yield of post-cold working. However, in general, Al is the more important alloying element in steel. The role of Al is first reflected in the final deoxidation of molten steel, which can keep the equilibrium oxygen of molten steel at a low level and avoid the appearance of high-oxygen steel; secondly, Al is an important fine-grained element, which can improve the strength and toughness of steel; in addition, Al It can also be used to fix nitrogen (N), thereby reducing the aging of steel. The amount of Al added to reflect the above effects i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/28C22C33/06
Inventor 刘明杨洪波邓通武柯晓涛康斌陈小龙刘昌恒代华云寄海明
Owner PANGANG GROUP VANADIUM TITANIUM & RESOURCES
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