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Control method of steel inclusions for railway bogie

A control method and bogie technology, applied in the manufacture of converters, etc., can solve the problems of difficult composition and process design optimization of the whole process, poor control of inclusions, and substandard performance, so as to reduce the number of endogenous inclusions, reduce the Sulfur content, the effect of reducing smelting pressure

Inactive Publication Date: 2020-07-28
NANJING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, all the steel used for high-speed rail bogies is imported from abroad. Several major domestic OEMs, including Changchun Bus, Qingdao Sifang, Puzhen Vehicle, Zhuzhou Vehicle, etc., use different bogie grades due to the different technologies they have introduced from abroad. , including Japanese standard SM490, European standard S355J2W, P355NL2, and 16MnDR, etc., so it is difficult to optimize the composition and process design of the whole process
However, self-developed substitute products often fail to meet the performance standards due to poor inclusion control, and cannot stably replace imported products.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Example 1: The components are controlled according to the following requirements: C: 0.060wt.%, Si: 0.30wt.%, Mn: 1.10wt.%, P: 0.012wt.%, S: 0.0015wt.%, Ni: 0.22wt. %, Cr: 0.49wt.%, Cu: 0.33wt.%, Al: 0.017wt.%, Nb: 0.023wt.%, Mo: 0.006wt.%, V: 0.038wt.%, Zr: 0.13wt.% , Ti: 0.006wt.%, Ca: 0.0010wt.%, the balance is Fe and impurities.

[0020] and prepared as follows:

[0021] 1. The molten iron pretreatment adopts the KR method for desulfurization to ensure that the sulfur content of the molten iron into the furnace is not more than 0.002%;

[0022] 2. The pretreated molten iron is smelted by converter, using top-bottom re-blowing mode, the smelting end temperature is controlled at 1610℃, the carbon is controlled at 0.05%, and the end-point oxygen content is controlled at 300ppm;

[0023] 3. The molten steel reaches the LF furnace for heating operation, slag submerged arc operation for three minutes to ensure a slight positive pressure, and deoxidation alloying operati...

Embodiment 2

[0027] Example 2: The components are controlled according to the following requirements: C: 0.062wt.%, Si: 0.40wt.%, Mn: 1.30wt.%, P: 0.015wt.%, S: 0.0015wt.%, Ni: 0.26wt.% %, Cr: 0.55wt.%, Cu: 0.32wt.%, Al: 0.060wt.%, Nb: 0.030wt.%, Mo: 0.005wt.%, V: 0.030wt.%, Zr: 0.005wt.% , Ti: 0.010wt.%, Ca: 0.0020wt.%, the balance is Fe and impurities.

[0028] and prepared as follows:

[0029] 1. The molten iron pretreatment adopts the KR method for desulfurization to ensure that the sulfur content of the molten iron into the furnace is not greater than 0.0015%;

[0030] 2. The pretreated molten iron is smelted by converter, and the top-bottom blowing mode is adopted. The temperature at the end of the smelting is controlled at 1610-1620℃, the carbon is controlled at 0.06%, and the oxygen content at the end is controlled at 400ppm;

[0031] 3. The molten steel reaches the LF furnace for heating operation, slag submerged arc operation for three minutes to ensure a slight positive pressu...

Embodiment 3

[0035] Example 3: The components are controlled according to the following requirements: C: 0.100wt.%, Si: 0.26wt.%, Mn: 1.23wt.%, P: 0.011wt.%, S: 0.0011wt.%, Ni: 0.18wt.% %, Cr: 0.48wt.%, Cu: 0.35wt.%, Al: 0.032wt.%, Nb: 0.026wt.%, Mo: 0.036wt.%, V: 0.041wt.%, Zr: 0.15wt.% , Ti: 0.009wt.%, Ca: 0.0030wt.%, and the balance is Fe and impurities.

[0036] and prepared as follows:

[0037] 1. The molten iron pretreatment adopts KR method for desulfurization to ensure that the sulfur content of the molten iron into the furnace is not more than 0.0011%;

[0038] 2. The pretreated molten iron is smelted in a converter, and the top and bottom blowing mode is adopted. The temperature at the end of the smelting is controlled at 1650°C, the carbon is controlled at 0.07%, and the oxygen content at the end is controlled at 600ppm;

[0039] 3. The molten steel reaches the LF furnace for heating operation, slag submerged arc operation for three minutes to ensure a slight positive pressure...

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PUM

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Abstract

The invention discloses a control method of steel inclusions for a railway bogie. According to the method, through pretreatment of molten iron, the content of slag in the molten iron and the low sulfur content are effectively reduced, the heat source of a converter is guaranteed, and the smelting pressure of the converter is relieved; through smelting of the converter, the original oxygen contentof the molten iron is effectively reduced, oxide inclusions generated after the molten iron reaches a steel ladle are greatly reduced, and the number of the inclusions generated in the molten iron ina smelting process is reduced; through a refining treatment mode, the inclusions are denatured, and solid inclusions mainly containing CaO-CaS are generated; and a high overheating degree and weak cooling mode is adopted for continuous casting, it is guaranteed that the molten iron effectively floats and is adsorbed at a ladle, a tundish, a cleaner and a solidification tail end in a casting process, a quite small amount of inclusions are gathered in the center of a casting blank, the purity of the molten iron is effectively improved, and the anti-fatigue characteristic of a product is improved.

Description

technical field [0001] The invention designs a steel for railway bogies, and specifically relates to a method for controlling steel inclusions for railway bogies. Background technique [0002] In recent years, the country has vigorously developed rail transit construction, and my country's rail transit industry has developed rapidly. As an important business card of the country, high-speed rail has an annual investment of about 800 billion yuan, and the annual steel demand has increased to 40 million tons, of which the steel plate consumption is about 1.3-1.8 million tons. The railway steel market has a very broad prospect. [0003] With the increase in the speed of railway vehicles and the upgrading of equipment, higher quality requirements have also been put forward for steel plates for bogies: fatigue life, inclusions, welding performance, bending performance, band structure control, grain size, Weather resistance, etc. have strict requirements. At present, all the stee...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C33/04B22D11/18C21C1/02C21C5/35C21C7/00C21C7/06C21C7/064C21C7/10C22C38/02C22C38/04C22C38/06C22C38/42C22C38/44C22C38/46C22C38/48C22C38/50
CPCB22D11/18C21C1/02C21C5/35C21C7/0006C21C7/06C21C7/064C21C7/10C22C33/04C22C38/002C22C38/02C22C38/04C22C38/06C22C38/42C22C38/44C22C38/46C22C38/48C22C38/50
Inventor 方磊翟冬雨陈萌张媛钰陈飞
Owner NANJING IRON & STEEL CO LTD
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