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

Active Publication Date: 2015-11-11
SHANDONG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The vanadium-nitrogen alloying method is commonly used to increase nitrogen in steel, but there is a defect of insufficient nitrogen increase, so the nitrogen increase process of manganese nitride cored wire is developed to solve such problems

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Example 1: S450J0 steel grade, 120-ton double blowing converter

[0036] S450J0 steel is produced by using molten iron pretreatment→top-bottom double blowing converter smelting→LF furnace refining→continuous casting process, wherein nitrogen and manganese are increased by the method of the present invention, and other operations can be performed according to the prior art. It includes the following steps:

[0037] a. Using pretreated molten iron, various alloys should be baked and dried before use;

[0038] b. Control target of converter end point: [C]≥0.08%, [P]≤0.025%, T≥1650℃; adopt slag blocking for tapping, use silicon manganese, ferrosilicon and vanadium nitrogen for alloying, and melt manganese in molten steel during alloying The content is controlled at the lower limit of the composition (the lower limit of the manganese composition of S450J0 steel is 1.30%), the silicon calcium barium is finally deoxidized, the addition amount is 2.0kg / t steel, and the lime bl...

Embodiment 2

[0043] Example 2: Q550D, 120-ton double blowing converter

[0044] The Q550D steel produced by using molten iron pretreatment→top-bottom double blowing converter smelting→LF furnace refining→continuous casting process, wherein the method of the present invention is used to increase nitrogen and manganese, and other operations can be performed according to the prior art. Proceed as follows:

[0045] a. Using pretreated molten iron, various alloys should be baked and dried before use;

[0046] b. Control target of converter end point: [C]≥0.06%, [P]≤0.020%, T≥1640℃; adopt slag blocking for tapping, use silicon manganese, ferroniobium, and ferrochrome alloying, and finally deoxidize aluminum manganese and ferromanganese, add The amount of steel is 3.5kg / t, and 600kg of white ash blocks are added. During alloying, the manganese content of molten steel is controlled at the lower limit of composition (the lower limit of manganese for Q550D is 1.20%).

[0047] c. After the ladle e...

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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.

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

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C5/35C21C7/00
Inventor 王强毕永杰王明杰于亮涛胡增跃温福新邹春锋
Owner SHANDONG IRON & STEEL CO LTD
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