A nitrogen-increasing and manganese-increasing method for high-strength steel production

A technology of high-strength steel and manganese nitride cladding, which is applied in the field of iron and steel metallurgy and steelmaking, can solve problems such as insufficient nitrogen addition, and achieve the effects of increased yield, excellent cold bending performance, and improved impact value
CN104263876BActive Publication Date: 2015-11-11SHANDONG IRON & STEEL CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
SHANDONG IRON & STEEL CO LTD
Publication Date
2015-11-11

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Abstract

The invention relates to a nitrogen-increasing manganese-increasing method for high-strength steel production. The method comprises the following steps: feeding manganese nitride core-spun yarns into molten steel for increasing nitrogen and manganese in an LF furnace refining process, wherein the diameter of the manganese nitride core-spun yarns is 12-14mm, the core powder weight of the manganese nitride core-spun yarns is 450-500g / m, and the tare weight is 125-175g / m; feeding 280-300 meters of manganese nitride core-spun yarns into the molten steel per ton, realizing complete nitrogen increase, stably controlling the nitrogen increase of the molten steel to be 50-60ppm, and finishing partial manganese increase in the process of realizing complete nitrogen increase, wherein the manganese increase amount is 0.09-0.10 percent. According to the method, nitrogen is not needed to be blown in each process, the nitrogen increase amount is controlled in one step, the increase of nitrogen in the molten steel can be finished when the manganese is increased at the refining part, and the yield of nitrogen in the molten steel is improved.
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Description

technical field

[0001] The invention relates to a nitrogen-increasing and manganese-increasing method for high-strength steel production, belonging to the technical field of iron and steel metallurgy and steelmaking. Background technique

[0002] Ti, V, Nb microalloying technology has been widely used in the world for its significant economic and technological advantages, and nitrogen can improve the strength and plasticity of steel, expand the austenite region, refine grains, and improve its processing. Therefore, the use of vanadium-nitrogen microalloying technology achieves high strength at low vanadium content, which significantly saves the amount of vanadium and reduces the cost of steel, especially in high-strength steels. CN102732686A discloses a method for producing vanadium-nitrogen microalloyed high-strength steel by adopting a two-step vacuum method, adding a vacuum treatment process to the smelting process of vanadium-nitrogen microalloyed high-strength steel, an...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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