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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: 2010-12-08
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
  • Production method for preventing cracks on medium-carbon high manganese steel
  • 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 high-manganese steel billet used by the inventor in the past includes the following process: converter smelting-LF+RH refining-billet continuous casting. Among them, micro-titanium alloying treatment is not carried out, and in the original continuous casting process, the continuous casting casting speed is 0.3-0.7m / min, and the cooling intensity is about 0.6-0.7L / kg. Surface longitudinal cracking defects occur on the manufactured 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 secondary cooling zone is 750-800°C, the maximum heat recovery rate of the slab surface is controlled within 120°C / m, and the maximum temperature drop rate Control within 87°C / m, because the reheat rate and cooling rate of the slab surface are relatively large, which has an adverse ...

Embodiment 1

[0021] Embodiment 1 prepares 37Mn high-pressure cylinder steel

[0022] Process route: hot metal 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. Among them, when the acid-soluble aluminum content in the steel is adjusted to 0.020% to 0.050% at the RH station, 0.8 to 1.0kg of titanium-iron alloy is added per ton of steel (the Ti content in the alloy is about accounted for 40%), so that the content of [Ti] in the steel is controlled at 0.025% to 0.045%, the caster casting speed is 0.3 to 0.6m / min during continuous casting, the cooling intensity is 0.37 to 0.53L / kg, and the secondary cooling zone of continuous casting The surface temperature of the slab at the outlet of the tension leveler is 850-890°C, the maximum heat recovery rate of the slab surface is 30°C / m, and the maximum temperature drop rate is 20°C / m...

Embodiment 2

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

[0027] Process route: hot metal 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 0.9kg of titanium-iron alloy is added per ton of steel (the Ti content in the alloy is about accounted for 40%), so that the content of [Ti] in the steel is controlled to 0.020% ~ 0.040%, the caster casting speed is 0.3 ~ 0.6m / min during continuous casting production, the cooling intensity is 0.37 ~ 0.53L / kg, the secondary cooling zone of continuous casting The surface temperature of the slab at the outlet of the tension leveler is 850-890°C, the maximum heat recovery rate of the slab surface is 30°C / m, and the maximum temperature drop rate is 20°C / m. After the ...

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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 manganesesteel 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 high-manganese steel, and is especially suitable for controlling cracks in medium-carbon high-manganese steel blooms with strong crack sensitivity. Background technique [0002] Medium-carbon high-manganese steel has poor thermal conductivity and strong crack sensitivity, especially when the aluminum content in the steel increases, the thermoplasticity of the steel will be reduced, especially when the temperature is lower than 850 °C. This is because the AlN in it precipitates along the austenite grain boundary, and cracks are formed near the precipitate under the action of stress, which will lead to embrittlement of the grain boundary. At the same time, the fine AlN particles hinder the migration of the grain boundary, making the sliding The shift is easier to form micro-voids, which further...

Claims

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Application Information

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Patent Type & Authority Patents(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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