Method for controlling nitrogen content of steel grade in CV-LF-RH-CC process path

A CV-LF-RH-CC, nitrogen content technology, applied in the direction of manufacturing converters, etc., can solve the problems of reducing impact toughness, welding performance thermal stress zone toughness, reducing steel forming and cold bending properties, and increasing steel brittleness.
CN113403444AActive Publication Date: 2021-09-17MAANSHAN IRON & STEEL CO LTD
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Applications(China)
Current Assignee / Owner
MAANSHAN IRON & STEEL CO LTD
Publication Date
2021-09-17

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Abstract

The invention discloses a method for controlling the nitrogen content of a steel grade in a CV-LF-RH-CC process path, and relates to the technical field of ferrous metallurgy. The method aims at achieving stable control over the nitrogen content and alloy components of the steel grade in the CV-LF-RH-CC process path. According to the method, stable control over the nitrogen content and the alloy components is achieved by strictly controlling the converter bottom blowing process, the steel tapping alloying process, the slag variety and adding amount, LF temperature rising, slagging and alloying process bottom blowing, the RH refining vacuum degree and time, the wire feeding speed, the casting process and other processes. According to the method, through strict control over the converter blowing process, the deoxidation alloying process of the primary molten steel, the LF and RH duplex refining process and the like, all alloy elements can stably reach target values, and the nitrogen content is stably controlled to be 30 ppm or below.
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Description

technical field

[0001] The invention relates to the technical field of iron and steel metallurgy, in particular to a method for controlling the nitrogen content of steel grades in a CV-LF-RH-CC process path. Background technique

[0002] Nitrogen has a great influence on the performance of steel, which is mainly reflected in the following aspects: 1) Nitrogen precipitates at the grain boundary, causing blue brittleness of steel; 2) The existence of nitrogen in steel reduces the impact toughness and welding performance of steel , the toughness of the thermal stress zone, which increases the brittleness of the steel; 3) Nitrogen combines with Ti or Al in the steel to form TiN or AlN, which weakens the grain boundary strength, changes the brittle zone of the steel, and easily causes cracks on the surface of the slab; 4) Continuous The nitrides precipitated in solid solution during casting have a more serious impact on the fatigue life of steel than the deoxidized products of th...

Claims

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