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400MPa-grade titanium microalloyed hot-rolled steel bar and production method thereof

A technology of microalloying and production method, applied in the field of steel production, can solve the problems of large consumption of precious alloy resources, high content of alloying elements, large fluctuation of product performance, etc. The effect of utilization

Active Publication Date: 2022-04-08
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention mainly solves the problems of high alloy element content, low alloy utilization rate, large product performance fluctuation, large consumption of precious alloy resources and complex production process of hot-rolled steel bars currently using V microalloying as the main technical means, and at the same time It also solves the problems of low utilization rate of Ti and unstable performance in existing Ti microalloyed steel bars. Through reasonable matching of the content of cheaper elements, the utilization efficiency of alloys is improved, alloy resources are saved, product performance stability is improved, and the Production cost and process difficulty

Method used

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  • 400MPa-grade titanium microalloyed hot-rolled steel bar and production method thereof
  • 400MPa-grade titanium microalloyed hot-rolled steel bar and production method thereof

Examples

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Embodiment 1

[0069] This example is used to illustrate the 400MPa grade titanium microalloyed hot-rolled steel bar and its production method described in the present invention.

[0070] Melt molten iron and scrap steel into molten steel; when the temperature of molten steel reaches 1670°C and the composition of molten steel reaches C: 0.05%, P: 0.02%, and S: 0.03% by mass fraction, the steel is tapped; when the tapping amount is 1 / 3 to 3 During the / 4 process, silicon and manganese are added to the ladle for deoxidation alloying; after tapping is completed, the ladle is transported to the refining station for alloying; first, the composition of molten steel is adjusted to C: 0.24%, Si: 0.52%, Mn: 1.54%; then, add titanium according to the Si and Mn contents of molten steel, and the Ti mass fraction reaches 0.04%, satisfying the relationship (1): [Si]+1.6[Mn]+47.3[Ti]-258.8[Ti] 2 +487.9[Ti] 3 =4.49; Finally, molten steel with qualified composition is obtained; the molten steel with qualifi...

Embodiment 2

[0074] This example is used to illustrate the 400MPa grade titanium microalloyed hot-rolled steel bar and its production method described in the present invention.

[0075] Smelting molten iron into molten steel; when the temperature of molten steel reaches 1680°C and the composition of molten steel reaches C: 0.10%, P: 0.045%, and S: 0.01% by mass fraction, the steel is tapped; during the process of 1 / 3 to 3 / 4 of the tapping amount During the process, silicon and manganese are added to the ladle for deoxidation alloying; during the tapping process, silicon is added to the molten steel for deoxidation; after the tapping is completed, the ladle is transported to the refining station for alloying; Reach C: 0.20%, Si: 0.31%, Mn: 1.0%; then, add ferro-titanium alloy according to Si and Mn content of molten steel, Ti mass fraction reaches 0.1%, satisfying relational formula (1): [Si]+1.6[Mn ]+47.3[Ti]-258.8[Ti] 2 +487.9[Ti] 3 = 4.54; Add Al and Ca cored wires to the molten steel;...

Embodiment 3

[0080] This example is used to illustrate the 400MPa grade titanium microalloyed hot-rolled steel bar and its production method described in the present invention.

[0081] Melt scrap steel into molten steel; when the temperature of molten steel reaches 1620°C and the composition of molten steel reaches C: 0.2%, P: 0.01%, and S: 0.03% by mass fraction, the steel is tapped; when the tapping amount is 1 / 3 to 3 / 4 During the process, silicon and manganese are added to the ladle for deoxidation and alloying; the molten steel after tapping is subjected to LF refining, and the refining time is 35 minutes, and aluminum is added to the molten steel for deoxidation, and the ladle is bottom-blown with argon in the refining station; the molten steel is alloyed , first, adjust the composition of molten steel to reach C: 0.25%, Si: 0.2%, and Mn: 1.23% by mass fraction; then, feed titanium-containing cored wire according to the Si and Mn contents of molten steel, and the mass fraction of Ti r...

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Abstract

The invention relates to the technical field of steel production, in particular to a 400MPa-grade titanium microalloyed hot-rolled steel bar and a production method thereof. Based on the total mass of the 400MPa-grade titanium microalloyed hot-rolled steel bar, the 400MPa-grade titanium microalloyed hot-rolled steel bar comprises the following chemical components in percentage by mass: 0.2-0.25% of C, 0.2-0.8% of Si, 1-1.6% of Mn and 0.01-0.1% of Ti, and the contents of Si, Mn and Ti meet the following relational expression: [Si] + 1.6 [Mn] + 47.3 [Ti]-258.8 [Ti] + 487.9 [Ti] < 5.4. According to the technical scheme, the reasonable matching relation of the alloy elements is limited, the strengthening effect of the alloy elements is brought into full play, the utilization rate of the alloy elements is increased, and meanwhile the product quality performance is guaranteed.

Description

technical field [0001] The invention relates to the technical field of iron and steel production, in particular to a 400MPa grade titanium microalloyed hot-rolled steel bar and a production method thereof. Background technique [0002] With the popularization and implementation of new standards for hot-rolled threaded steel bars, various steel companies have eliminated the strong water penetration process and returned to the path of improving strength through alloys. The cost of alloying has risen significantly, which has brought great challenges to the cost and process stability control of enterprises. . At present, my country's rebar is generally alloyed with vanadium or niobium to improve the strength of the finished product and ensure the target mechanical properties. Some enterprises also realize composite alloy strengthening by adding vanadium, niobium and titanium elements. my country's vanadium resources are relatively scarce and the price is relatively high. Niobi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/60C22C38/14C21D8/08C22C33/04C21C7/06C21C7/00
CPCY02P10/20
Inventor 郭跃华王超刘明赵小天邓通武代华云
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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