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A multi-element nitrided alloy and its application in the preparation of hot-rolled ribbed steel bars

A technology for hot-rolled ribbed steel bars and nitrided alloys, which is applied in the field of multi-element nitrided alloys and the preparation of hot-rolled ribbed steel bars, can solve the problem of inconvenience in actual operation, precise control of molten steel composition, and double nitrogen cored wire collection. Unstable yield, difficult overall process control, etc., to achieve the effect of being conducive to precise control, enhancing strengthening effect, and improving toughness and plasticity

Active Publication Date: 2021-10-08
LINGYUAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this method, after the converter is tapped, the ladle is opened to the argon blowing station to start feeding the wire. During the wire feeding process, soft argon blowing is used to increase the nitrogen in molten steel. Because the feeding speed, argon blowing, and single weight of core powder per meter fluctuate greatly, the addition amount is not large. Influenced by unfavorable factors such as stability, the control of the overall process is difficult, it is not convenient for actual operation and precise control of molten steel composition, and the yield of compound nitrogen cored wire is unstable; in addition, the increase of nitrides in molten steel will make the steel Decreased plasticity and toughness, thus affecting the properties of steel

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] 1. Preparation of multi-element nitrided alloys

[0036] The multi-element nitrided alloy of this embodiment includes, by mass content: Si: 26%, N: 19%, Ti: 16%, Cr: 7%, B: 1.5%, V: 0.5%, Nb: 0.4% , S≤0.10%, P≤0.10%, and the balance is iron and unavoidable impurities.

[0037] According to the above composition requirements, titanium nitride, boron nitride, chromium nitride and other raw materials are mixed and pressed into an alloy block with a grain size of 5-40 mm, so as to obtain the above multi-element nitride alloy.

[0038] 2. Preparation of hot-rolled ribbed steel bars

[0039] When the amount of steel tapping after the converter furnace reaches 1 / 4, argon gas is continuously introduced into the molten steel at a ventilation rate of 700NL / min for strong stirring. The control is 0.43%, and the manganese content is controlled to be 1.38%. Then, the above-mentioned multi-element nitride alloy is added to the molten steel in an amount of 0.3kg / ton of molten steel,...

Embodiment 2

[0043] 1. Preparation of multi-element nitrided alloys

[0044] The multi-element nitrided alloy of this embodiment includes, by mass content: Si: 25.5%, N: 18%, Ti: 16%, Cr: 8%, B: 1.8%, V: 0.6%, Nb: 0.5% , S≤0.10%, P≤0.10%, and the balance is iron and unavoidable impurities.

[0045] According to the above composition requirements, titanium nitride, boron nitride, chromium nitride and other raw materials are mixed and pressed into an alloy block with a particle size of 5-40 mm, so as to obtain the above multi-element nitride alloy.

[0046] 2. Preparation of hot-rolled ribbed steel bars

[0047] When the amount of steel tapping after the converter furnace reaches 1 / 3, argon gas is continuously introduced into the molten steel at a ventilation rate of 800NL / min for strong stirring. is 0.39%, manganese content is 1.39%, then adds above-mentioned multi-element nitride alloy to molten steel with the addition of 0.5kg / ton of molten steel, adds ferrovanadium nitride ( The vana...

Embodiment 3

[0051] 1. Preparation of multi-element nitrided alloys

[0052] The multi-element nitrided alloy of this embodiment includes, by mass content: Si: 22%, N: 15%, Ti: 13%, Cr: 8%, B: 2.0%, V: 0.5%, Nb: 0.3% , S≤0.15%, P≤0.10%, and the balance is iron and unavoidable impurities.

[0053] According to the above composition requirements, titanium nitride, boron nitride, chromium nitride and other raw materials are mixed and pressed into an alloy block with a particle size of 5-40 mm, so as to obtain the above multi-element nitride alloy.

[0054] 2. Preparation of hot-rolled ribbed steel bars

[0055] When the amount of steel tapping after the converter furnace reaches 1 / 4, argon gas is continuously introduced into the molten steel at a ventilation rate of 600NL / min for strong stirring. It is 0.43%, and manganese content is 1.46%, then adds above-mentioned multi-element nitride alloy to molten steel with the addition of 0.8kg / ton of molten steel, adds ferrovanadium nitride ( The...

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Abstract

The invention provides a multi-element nitrided alloy and its application in preparing hot-rolled ribbed steel bars. The multi-element nitrided alloy of the present invention comprises, by mass content: Si: 20-37%, N: 10-22%, Ti: 8-21%, Cr: 4-9%, B: 0.5-3%, V≤1%, Nb≤1%, S≤0.15%, P≤0.15%, and the balance is iron and unavoidable impurities. The multi-element nitrided alloy of the present invention does not add expensive alloy elements such as niobium and vanadium, and when used in conjunction with other strengthening elements such as ferrovanadium nitride, can greatly reduce the amount of strengthening elements and improve the effective utilization of strengthening elements, thereby A good strengthening effect is obtained; the multi-element nitrided alloy is used to strengthen the toughness, plasticity, aging resistance and mechanical properties of the hot-rolled ribbed steel bar, and at the same time, the production cost per ton of steel is effectively reduced.

Description

technical field [0001] The invention relates to the technical field of preparation of hot-rolled ribbed steel bars, in particular to a multi-element nitrided alloy and its application in preparing hot-rolled ribbed steel bars. Background technique [0002] At present, in order to improve the strength of hot-rolled ribbed steel bars, alloying elements such as niobium and vanadium are generally used for strengthening, and the amount of vanadium and iron added per ton of molten steel is as high as about 1kg. On the one hand, vanadium, niobium and other alloying elements are limited by resources, and the price is high, and a large amount of addition is not conducive to reducing the cost per ton of steel; Low, unable to effectively play its strengthening role. [0003] In order to solve the above problems, the prior art proposes to use compound nitrogen cored wire for reinforcement. In this method, after the converter is tapped, the ladle is opened to the argon blowing station ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C35/00C21C7/00C21C7/06
CPCC21C7/0068C21C7/06C22C35/00C22C35/005
Inventor 贾文军张国新刘福成路丰
Owner LINGYUAN IRON & STEEL CO LTD