Production method for preventing cracks on medium-carbon high manganese steel

A production method and technology of high manganese steel, applied in the field of iron and steel metallurgy, can solve problems such as surface defects of round steel

Inactive Publication Date: 2009-04-22
PANGANG GROUP RESEARCH INSTITUTE CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, for medium-carbon high-manganese steel blooms with large dimensions and poor thermal conductivity, using the existing composition design method and continuous casting process, the surface defects of continuous casting slabs and round steel rolled from continuous casting slabs are serious

Method used

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  • Production method for preventing cracks on medium-carbon high manganese steel
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  • Production method for preventing cracks on medium-carbon high manganese steel

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preparation example Construction

[0014] The preparation method of the medium carbon and high manganese steel billet used by the inventor in the past includes the following processes: converter smelting - LF+RH refining - billet continuous casting. Among them, micro-titanium alloying treatment is not performed, and in the original continuous casting process, the continuous casting pulling speed is 0.3-0.7 m / min, and the cooling strength is about 0.6-0.7 L / kg. The surface longitudinal crack defects are produced on the produced billet or the φ350mm round tube billet rolled from the billet, which is as high as 44% in severe cases. If the cooling intensity is 0.6-0.7L / kg, the surface temperature of the slab at the exit of the tension leveler in the second cooling zone is 750-800°C, the maximum recuperation rate of the slab surface is controlled within 120°C / m, and the maximum temperature drop rate Controlled within 87°C / m, due to the large surface recuperation rate and cooling rate of the billet, which has an adve...

Embodiment 1

[0021] Example 1 Preparation of 37Mn high pressure gas cylinder steel

[0022] Process route: molten iron pretreatment—converter smelting—LF+RH vacuum treatment—360mm×450mm bloom continuous casting—rail beam rolling into φ350mm round billet.

[0023] The composition is accurately adjusted at the LF and RH refining stations. When the acid-soluble aluminum content in the steel is adjusted to 0.020% to 0.050% at the RH station, 0.8 to 1.0 kg of titanium-iron alloy is added per ton of steel (the Ti content in the alloy is about 40%), so that the [Ti] content in the steel is controlled to be 0.025% to 0.045%, the casting speed of the casting machine is 0.3 to 0.6 m / min, the cooling strength is 0.37 to 0.53 L / kg, and the second cooling zone of continuous casting is used. The surface temperature of the billet at the exit of the tension leveler is 850-890℃, the maximum recuperation rate of the billet surface is 30℃ / m, and the maximum temperature drop rate is 20℃ / m. After the casting ...

Embodiment 2

[0026] Example 2 Preparation of 37Mn5 steel for oil well pipe

[0027] Process route: molten iron pretreatment—converter smelting—LF+RH vacuum treatment—360mm×450mm bloom continuous casting—rail beam rolling into φ350mm round billet.

[0028] The composition is accurately adjusted at the LF and RH refining stations. When the acid-soluble aluminum content in the steel is adjusted to 0.015% to 0.045% at the RH station, 0.7 to 0.9 kg of titanium-iron alloy is added per ton of steel (the Ti content in the alloy is about 40%), the [Ti] content in the steel is controlled to be 0.020% to 0.040%, the casting speed of the casting machine during continuous casting production is 0.3 to 0.6m / min, the cooling strength is 0.37 to 0.53L / kg, and the second cooling zone of continuous casting is used. The surface temperature of the billet at the exit of the tension leveler is 850-890℃, the maximum recuperation rate of the billet surface is 30℃ / m, and the maximum temperature drop rate is 20℃ / m. ...

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Abstract

The invention belongs to the technical field of ferrous metallurgy and particularly relates to a production method for preventing the cracking of mid-carbon high manganese steel. The method solves the technical problem of preventing the cracking of mid-carbon high manganese steel square billet during the continuous casting process production. The method for preparing the mid-carbon high manganese steel square billet comprises the following steps: rotary furnace smelting, LF+RH refining and square billet continuous casting; the method is characterized in that: during the continuous casting, the continuous casting pulling rate is controlled to be between 0.3 and 0.7m / min, and the cooling intensity is between 0.37 and 0.53L / kg; and simultaneously, at the RH refining station, after the Al content of steel is controlled to be between 0.010 and 0.050 percent, the ferrotitanium is added, and the Ti content of steel is controlled to be between 0.015 and 0.045 percent. By the improvement, the cracking of the mid-carbon high manganese steel big square billet which is strong in crack sensitivity is eliminated.

Description

technical field [0001] The invention belongs to the technical field of iron and steel metallurgy, and in particular relates to a production method for preventing cracks in medium-carbon and high-manganese steel, which is especially suitable for controlling cracks in blooms of medium-carbon and high-manganese steel with strong crack sensitivity. Background technique [0002] The medium carbon and high manganese steel has poor thermal conductivity and strong crack sensitivity, especially the increase of aluminum content in the steel will reduce the thermoplasticity of the steel, especially the thermoplasticity below 850 °C. This is because the AlN in it is precipitated along the austenite grain boundaries, and cracks are formed near the precipitates under the action of stress, which will lead to the embrittlement of the grain boundaries. It is easier to form micro-holes in the process of continuous casting, which further increases the sensitivity of cracks in the continuous ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/16B22D11/22C21C7/10
Inventor 陈永柯晓涛吴国荣曾建华杨素波雷秀华张先胜
Owner PANGANG GROUP RESEARCH INSTITUTE CO LTD
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