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Production technology of 37Mn5 steel

A production process and process technology, which is applied in the field of 37Mn5 steel and its production process, can solve the problems of surface cracks of thin-walled tubes and high folds through the tube, and cannot meet the needs of production of thin-walled tubes, and achieves a low content of non-metallic inclusions. , the effect of simple process

Inactive Publication Date: 2013-07-24
CHENGDE JIANLONG SPECIAL STEEL
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0024] However, the 37Mn5 steel prepared by the prior art still has certain defects in the control level of oxygen content, harmful elements, central porosity, non-metallic inclusions, and grain size. There is a high probability of quality defects such as surface cracks and pipe folding, which cannot meet the needs of thin-walled pipe production

Method used

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  • Production technology of 37Mn5 steel
  • Production technology of 37Mn5 steel
  • Production technology of 37Mn5 steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Synchronous production of 6 furnaces of 37Mn5 steel by the following processes:

[0051] (1) Converter process: ensure a hit rate at the end point, avoid back blowing, and control the carbon at the end point at 0.10%; the converter adopts the sliding plate slag blocking process; the double slag method is used to control the phosphorus content of molten steel.

[0052] (2) Refining process: LF refining treatment time is 20 minutes; strengthen the effect of deoxidation and removal of inclusions. It is required that the refining slag has a basicity of 2.5, FeO in the slag is 1%, and the white slag is kept for 15 minutes. After refining, the bottom blowing and argon soft blowing time is guaranteed to be 10 minutes, so as to facilitate the removal of inclusions in molten steel.

[0053] (3) Continuous casting process: Ladle and tundish are used for protective casting and sealed with argon blowing. The crystallizer adopts submerged nozzle + mold slag to realize full protectio...

Embodiment 2

[0064] 37Mn5 steel is produced by the following process:

[0065] (1) Converter process: ensure a hit rate at the end point, avoid back blowing, and control the carbon at the end point at 0.05%; the converter adopts the sliding plate slag blocking process; the double slag method is used to control the phosphorus content of molten steel.

[0066] (2) Refining process: LF refining treatment time is 15 minutes; strengthen deoxidation and de-inclusion effects. It is required that the refining slag has a basicity of 2.0, FeO in the slag is 2%, and the white slag is kept for 10 minutes. After refining, the bottom blowing and argon soft blowing time is guaranteed to be 10 minutes, so as to facilitate the removal of inclusions in molten steel.

[0067] (3) Continuous casting process: Ladle and tundish are used for protective casting and sealed with argon blowing. The mold adopts submerged nozzle + mold powder to realize full protection casting without oxidation; casting temperature: t...

Embodiment 3

[0071] 37Mn5 steel is produced by the following process:

[0072] (1) Converter process: ensure one-time end-point hit rate, avoid back blowing, and control the end-point carbon at 0.08%;

[0073] (2) Refining process: LF refining treatment time 18min; strengthen deoxidation and de-inclusion effects. It is required that the refining slag has a basicity of 2.2, FeO in the slag is 1.5%, and the white slag is kept for 13 minutes. After refining, the bottom blowing and argon soft blowing time is guaranteed to be 8 minutes to facilitate the removal of inclusions in molten steel.

[0074] (3) Continuous casting process: Ladle and tundish are used for protective casting and sealed with argon blowing. The mold adopts submerged nozzle + mold powder to realize full protection casting without oxidation; casting temperature: the superheat of the tundish is at 25°C; Mold liquid level braking control and electromagnetic stirring; mold mold slag is used to ensure the surface quality of the ...

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Abstract

The invention relates to 37Mn5 steel. The 37Mn5 steel is characterized by containing less than or equal to 15ppm of O, less than or equal to 0.015 percent of P and less than or equal to 0.010 percent of S; the center porosity is less than or equal to level 1.0; the steel has no visual shrinkage cavities, bubbles, cracks, inclusions, skull patches or white spots; and the sum of nonmetallic inclusion levels is less than or equal to level 3, the banded structure is less than or equal to level 2, and the granularity is level 6 to 8. A production technology of the 37Mn5 steel comprises the following processes of: (1) converter treatment, (2) refining, (3) continuous casting, (4) steel rolling and (5) finishing. The 37Mn5 steel can be used for producing thin-wall pipes.

Description

technical field [0001] The invention relates to the field of iron and steel smelting, specifically, the invention relates to a 37Mn5 steel and a production process thereof, and the 37Mn5 steel can be used in the production of thin-walled pipes. Background technique [0002] Thin-walled tubes are made of steel ingots or solid tube blanks that are perforated into capillary tubes, and then hot-rolled, cold-rolled or cold-drawn. Thin-walled pipe plays an important role in my country's steel pipe industry. The raw material of the thin-walled tube is a round tube billet, which is cut by a cutting machine into a billet with a length of about 1 meter, and sent to the heating furnace by a conveyor belt for heating. At present, about 2 million tons of petroleum pipe billet steel are used in the production of thin-walled pipes in my country every year, mainly J55 grade and N80 grade petroleum pipe billet steel of Φ75-150 mm. With the rapid development of electric power and petrochemi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C5/30C21C5/36C21C7/06C21C7/072B22D11/18B22D11/115F16L9/02
Inventor 韩冬刘江伟李学刚张献昭姚忠董诗朋廖正俊
Owner CHENGDE JIANLONG SPECIAL STEEL
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