Control method of cleanliness of interstitial-free steel

A technology of interstitial atom-free steel and control method, applied in the direction of manufacturing converters, etc., can solve the problems of deteriorating the cleanliness of molten steel, and achieve the effect of improving the cleanliness of molten steel, reducing the generation of inclusions, and ensuring the cleanliness.

Active Publication Date: 2017-03-01
SHOUGANG CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The embodiment of the present application provides a control method for the cleanliness of interstitial atom-free steel, which solves or partially solves the problem that the smelting process in the prior art cannot avoid the secondary oxidation of the molten steel after the deoxidation of the molten steel, which deteriorates the cleanliness of the molten steel. To solve the technical problems, the technical effect of reducing inclusions in the smelting process of niobium-titanium composite interstitial atom-free steel, improving the removal conditions of inclusions, and improving the cleanliness of molten steel

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  • Control method of cleanliness of interstitial-free steel

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Embodiment 1

[0051] S1: Put the desulfurized molten iron into the dephosphorization converter and the decarburization converter for dual smelting. The end target of controlled decarburization converter blowing is O: 0.098%, C: 0.022%, and the end temperature is 1689°C. The steel is tapped directly at the end of the converter without deoxidation to obtain the first molten steel. During the tapping process, 400kg of small-grained lime and 160kg of slow-release deoxidizer are added to carry out slag modification. During the tapping process, slag blocking is used to tap the steel, and the slag thickness is controlled to 75mm.

[0052] S2: RH refining is performed on the first molten steel. The target temperature of RH refining is 1632℃, the carbon content is 0.022%, and the oxygen content is 0.085%. If the actual arrival temperature deviates from the target arrival temperature by more than 15°C, use cooling scrap steel or OB to blow oxygen to perform temperature compensation operation. For ...

Embodiment 2

[0055] S1: Put the desulfurized molten iron into the dephosphorization converter and the decarburization converter for dual smelting. The end target of controlled decarburization converter blowing is O: 0.0823%, C: 0.037%, and the end temperature is 1689°C. The steel is tapped directly at the end of the converter without deoxidation to obtain the first molten steel. During the tapping process, 400kg of small-grained lime and 130kg of slow-release deoxidizer are added for slag modification. During the tapping process, slag blocking is used to control the slag thickness to 80mm.

[0056] S2: RH refining is performed on the first molten steel. The target temperature of the RH refining station is 1627°C, the carbon content is 0.027%, and the oxygen content is 0.072%. If the actual arrival temperature deviates from the target arrival temperature by more than 15°C, use cooling scrap steel or OB to blow oxygen to perform temperature compensation operation. For the molten steel ent...

Embodiment 3

[0059] S1: Put the desulfurized molten iron into the dephosphorization converter and the decarburization converter for dual smelting. The end target of controlled decarburization converter blowing is O: 0.084%, C: 0.026%, and the end temperature is 1685°C. The steel is tapped directly at the end of the converter without deoxidation to obtain the first molten steel. During the tapping process, 400kg of small-grained lime and 130kg of slow-release deoxidizer are added for slag modification. During the tapping process, slag blocking is used to control the slag thickness to 70mm.

[0060] S2: RH refining is performed on the first molten steel. The target temperature of RH refining is 1627℃, the carbon content is 0.026%, and the oxygen content is 0.077%. If the actual arrival temperature deviates from the target arrival temperature by more than 15°C, use cooling scrap steel or OB to blow oxygen to perform temperature compensation operation. For the molten steel entering the stat...

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Abstract

The invention relates to a niobium-titanium composite interstitial free steel, which comprises the following chemical components as follows by weight: no more than 0.015% of C, no more than 0.02% of Si, 0.10-0.15% of Mn, no more than 0.01% of P, no more than 0.01% of S, 0.02-0.06% of Al:, 0.01-0.03% of Nb, no more than 0.003% of N, and the balance of Fe and unavoidable impurities. The invention also relates to a control method of niobium-titanium composite interstitial free steel cleanliness. The method comprises the steps of: adding desulphurized molten iron into a dephosphorization converter and a decarbonization converter for duplex smelting; deoxygenated tapping is carried out after smelting to obtain a first molten steel; the first molten steel is added to an RH vacuum refining device for vacuum refining to obtain a second molten steel; the second molten steel is sent to a continuous casting process, three-way argon is employed for protective casting, so as to ultimately obtain the niobium-titanium composite interstitial free steel. The control method reduces generation of inclusions in the niobium-titanium composite interstitial free steel, improves removal conditions for the inclusion, and improve the cleanliness of molten steel.

Description

technical field [0001] The invention relates to the technical field of steelmaking, in particular to a method for controlling the cleanliness of interstitial atom-free steel. Background technique [0002] IF steel, also known as interstitial-free steel, has excellent stamping properties and is widely used in the automotive industry. Nb-Ti composite IF steel has the advantages of both Ti-IF steel and Nb-IF steel, and has the characteristics of good mechanical properties, uniform performance of the whole coil, and strong anti-powdering ability of the coating. Nb-Ti composite IF steel has higher requirements on inclusions. To smelt this type of steel, it is usually first blown in a converter until the steel is tapped with low carbon and high oxygen. Vacuum decarburization is then carried out by RH refining to further reduce the carbon content of molten steel to an extremely low level. [0003] In the smelting process of the prior art, due to low carbon and high oxygen at the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/12C21C5/28C21C7/10
Inventor 李一丁黄学启季晨曦崔阳李亚东王志鹏刘再旺关顺宽黄财德
Owner SHOUGANG CORPORATION
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