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Bainite steel frog and manufacture method thereof by three-stage cooling after rolling

A technology of bainitic steel and three-stage cooling, which is applied in the manufacture of tools, switches, rails, etc., can solve the problems of low material plasticity, poor welding performance, and unstable performance, and achieve high performance, low cost, and low cost. Reduced effect

Active Publication Date: 2012-10-17
YANSHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] Among them, both the United States and the United Kingdom contain 3wt% nickel, which has high cost and low plasticity of the material; Germany's has poor welding performance because of its high carbon content; Japan's has not been successfully applied in practice; my country's performance is unstable

Method used

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  • Bainite steel frog and manufacture method thereof by three-stage cooling after rolling

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Experimental program
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Effect test

Embodiment 1

[0025] Firstly put relevant raw materials such as industrial pure iron, ferronickel, ferrochrome, ferromanganese, and industrial pure aluminum into molten steel, then use the LF furnace to refine the molten steel outside the furnace, and use the RH method to conduct vacuum degassing treatment on the molten steel . Continuous casting of molten steel at 1550°C into steel slabs, the chemical composition (wt%) of the steel slabs is: C 0.20, Mn 1.10, Al 0.50, Ni 0.62, Cr 1.92, Si 1.50, Ti 0.008, B 0.0003, H 0.00008, V 0.0011, Nb 0.008, O 0.0012, S 0.006, P 0.003, and the rest were Fe. Then, the above-mentioned continuous casting billet is subjected to hot rolling, the rolling ratio is 13, the rolling temperature is 1140°C, and the final rolling temperature is 920°C, and it is rolled into a frog material with a cross-sectional shape similar to that of a rail. Such as figure 1 shown. The rolled frog rolling is subjected to three-stage cooling treatment. The cooling rate is 50 °C / m...

Embodiment 2

[0027]Firstly put relevant raw materials such as industrial pure iron, ferronickel, ferrochrome, ferromanganese, and industrial pure aluminum into molten steel, then use the LF furnace to refine the molten steel outside the furnace, and use the RH method to conduct vacuum degassing treatment on the molten steel . The molten steel is continuously cast at 1600°C into billets. The chemical composition (wt%) of the continuously cast billets is: C 0.19, Mn 1.86, Al 0.68, Ni 0.75, Cr 1.48, Si1.15, Ti 0.009, B 0.0001, H0. 00009, V 0.009, Nb 0.005, O 0.0010, S 0.008, P 0.009, and the rest is Fe. Then, the continuous casting steel billet is hot-rolled, the rolling ratio is 14, the rolling temperature is 1130°C, and the final rolling temperature is 900°C, and it is rolled into a frog material with a cross-sectional shape similar to that of a rail, such as figure 1 shown. The rolled frog rolling is subjected to three-stage cooling treatment. The cooling rate is 65 °C / min at a temperatu...

Embodiment 3

[0029] Firstly put relevant raw materials such as industrial pure iron, ferronickel, ferrochrome, ferromanganese, and industrial pure aluminum into molten steel, then use the LF furnace to refine the molten steel outside the furnace, and use the RH method to conduct vacuum degassing treatment on the molten steel . Continuous casting of molten steel at 1580°C into steel slabs, the chemical composition (wt%) of the continuous casting slabs is: C 0.22, Mn 1.65, Al 0.52, Ni 0.92, Cr 1.67, Si1.31, Ti 0.006, B 0.0003, H 0.00007, V 0.0013, O 0.0011, S 0.009, P 0.008, Nb 0.003, and the rest were Fe. Then, the above-mentioned continuous casting billet is subjected to hot rolling, the rolling ratio is 11, the rolling temperature is 1100°C, and the final rolling temperature is 860°C, and it is rolled into a cross-sectional frog material with a cross-sectional shape similar to that of a rail, such as figure 1 shown. After rolling, the frog rolling is subjected to three-stage cooling tre...

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Abstract

The invention discloses a bainite steel frog, comprising 0.18-0.23 wt% of C, 1.0-2.0 wt% of Mn, 0.4-0.7 wt% of Al, 0.6-1.0 wt% of Ni, 1.4-2.0 wt% of Cr, 1.0-1.6 wt% of Si, less than 0.01 wt% of Ti, less than 0.0005 wt% of B, less than 0.03 wt% of V, less than 0.01 wt% of Nb, less than 0.0016 wt% of O, less than 0.0001 wt% of H, less than 0.01 wt% of S, and less than 0.01wt% of P, and the balance of Fe A method for manufacturing the bainite steel frog comprises the following steps: smelting in an oxygen converter; then conducting external refining; and then forming sectional form by continuous casting and hot rolling to obtain a railway frog blank material, wherein the rolling ratio is larger than 9; after rolling, directly conducting three-stage cooling to room temperature; and finally heating up to 310-330 DEG C, preserving the heat for 50-70min, and then conducting air cooling to room temperature. According to the invention, the advantages of simple process, low cost, energy saving performance and material saving performance are achieved, and the bainite steel frog has excellent welding performance.

Description

technical field [0001] The invention relates to a steel material and a manufacturing method thereof, in particular to special bainitic steel for railway frogs and a manufacturing method thereof. Background technique [0002] ZGMn13 austenitic high manganese steel was invented by British engineer Hadfield in September 1882. Its first use was to make tramway frogs in 1892. Since then, almost all railway ruts in the world have been used for more than 100 years. Forks are made of this material. The chemical composition of ZGMn13 originally announced by Hadfield is: C1.35%, Si0.69%, Mn12.76%. At present, the recognized chemical composition range of ZGMn13 steel is C1.0~1.4%, Mn11~14%, the rest is iron and a small amount of impurities such as Si, S, P, etc. The average overload capacity (service life) of ZGMn13 steel frogs produced in my country is 150 million tons, and the average service life of ZGMn13 steel frogs produced in the United States and some developed countries in E...

Claims

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Application Information

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IPC IPC(8): C22C38/58C22C38/54C22C38/50C22C38/48C22C38/46C21D8/00C21D9/04E01B7/10
Inventor 张福成张明吕博郑炀曾王天生
Owner YANSHAN UNIV
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