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A production method that can effectively control the quality of 37mn round billet steel billet

A production method and a technology for a round tube blank, which are applied in the metallurgical field, can solve the problems of low equiaxed crystal rate, etc., and achieve the effects of increasing the equiaxed crystal rate, expanding the area of ​​the equiaxed crystal area, and improving the internal quality of the casting billet.

Active Publication Date: 2018-04-20
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The present invention provides a production method that can effectively control the quality of 37Mn round billet steel billets, and aims to solve the problem that the equiaxed grain rate of 37Mn round billet steel billets with large cross-sectional sizes produced by existing production methods is generally low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A steelmaking plant adopts the technological process of 120t converter smelting → LF furnace refining → RH vacuum treatment → four-machine four-strand casting machine φ350mm section continuous casting to produce 37Mn round tube billet steel billet.

[0028] At the end of converter blowing, the carbon content range at the end of the converter is controlled at 0.10%, and the temperature at the end is controlled at 1673°C; the red bag is tapped, and the thickness of the ladle slag layer is 72mm after tapping; the small platform is fed with 1.7m per ton of steel Feed the aluminum wire with a certain amount of feed, and carry out deoxidation treatment. The outbound components of the small platform are controlled as follows: C 0.33%, Si 0.20%, Mn 1.20%, P0.012%. The stirring time was 6.3 minutes, and the molten steel was not exposed during stirring.

[0029] The molten steel reaches the LF refining furnace, blowing argon to make the molten steel fluctuate slightly, and there ...

Embodiment 2

[0034] A steelmaking plant adopts the technological process of 120t converter smelting → LF furnace refining → RH vacuum treatment → four-machine four-strand casting machine φ350mm section continuous casting to produce 37Mn round tube billet steel billet.

[0035] At the end of converter blowing, the carbon content range at the end of the converter is controlled at 0.15%, and the temperature at the end is controlled at 1677°C; after tapping is completed, the thickness of the ladle slag layer is 78mm; the small platform is 1.45m / t 钢 The feeding amount is fed to the aluminum wire and deoxidized. The outbound composition of the small platform is controlled as follows: C 0.30%, Si 0.25%, Mn 1.30%, P 0.009%. After 7.1 minutes, the molten steel was not exposed after stirring.

[0036] When the molten steel reaches the LF refining furnace, argon blowing is carried out to make the molten steel fluctuate slightly, and there is no big turning phenomenon; after the refining is completed,...

Embodiment 3

[0041] A steelmaking plant adopts the technological process of 120t converter smelting → LF furnace refining → RH vacuum treatment → four-machine four-strand casting machine φ350mm section continuous casting to produce 37Mn round tube billet steel billet.

[0042] At the end of converter blowing, the carbon content range at the end of the converter is controlled at 0.05%, and the temperature at the end is controlled at 1678°C; after tapping is completed, the thickness of the ladle slag layer is 74mm; the small platform is 2.0m / t 钢 The feeding amount is added, and deoxidation is carried out. The outbound composition of the small platform is controlled as follows: C 0.35%, Si 0.18%, Mn 1.40%, P 0.010%. Stirring did not reveal molten steel.

[0043] When the molten steel reaches the LF refining furnace, argon is blown to make the molten steel fluctuate slightly, and there is no big turning phenomenon; after the refining is completed, Ti is added according to 0.035% of the molten ...

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PUM

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Abstract

The invention belongs to the field of metallurgy and particularly discloses a production method capable of effectively controlling the quality of a 37Mn round pipe billet steel casting blank. The production method aims at solving the problems that when a 37Mn round pipe billet casting blank large in section size is produced through an existing production method, the equiaxial crystal ratio is commonly low. The production method capable of effectively controlling the quality of the 37Mn round pipe billet steel casting blank includes the steps of smelting performed in a converter, refining performed in an LF furnace, RH vacuum processing and continuous casting, and in the continuous casting step, according to electromagnetic stirring parameters of a crystallizer, stirring current is 300-400 A, and frequency is 2-4 Hz; according to electromagnetic stirring parameters at the final stage of solidification, stirring current is 100-250 A, and frequency is 4.0-7.0 Hz; overheat degree is controlled to be 20-35 DEG C; pulling speed is controlled to be 0.75-0.90 m / min; cooling of the crystallizer is controlled to be 2400-2500 L / min; secondary cooling specific water flow is controlled to be 0.21-0.30 L / kg steel. According to the method, by means of combined electromagnetic stirring of electromagnetic stirring of the crystallizer and electromagnetic stirring at the final stage of solidification, casting blank solidification heat transfer is optimized, the large-specification 37Mn round pipe billet casting blank solidification structure is controlled, and the equiaxial crystal ratio of the casting blank solidification structure is improved.

Description

technical field [0001] The invention belongs to the field of metallurgy, and in particular relates to a production method capable of effectively controlling the quality of a 37Mn round billet steel casting billet. Background technique [0002] 37Mn round tube billet steel is mainly used in the production of high-pressure gas cylinders, and its chemical composition is: C0.35%~0.39%, Si 0.17%~0.28%, Mn 1.55%~1.70%, P≤0.020%, S≤0.010%, Cr≤0.20%, Cu≤0.15%, Mo≤0.08%, Ni≤0.20%, Alt 0.020%-0.040%, and the balance is Fe. The high-pressure gas cylinder produced is a refillable mobile steel cylinder, which is used to hold permanent gas or high-pressure liquefied gas, and is widely used in industrial and mining enterprises, construction, transportation, marine, aviation, medical and military industries. Since there are many types of media filled in gas cylinders, and they are flammable, explosive, highly toxic or corrosive, and the gas cylinders are repeatedly filled and fluid, once a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/18C22C38/16C22C38/12C22C38/08C22C38/06C21C5/28C21C7/10C21C7/00B22D11/115
CPCB22D11/115C21C5/28C21C7/0006C21C7/10C22C38/02C22C38/04C22C38/06C22C38/08C22C38/12C22C38/16C22C38/18
Inventor 李红光陈天明郭华李扬洲陈亮郭奠荣杨文中李志强冯远超
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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