600MPa-grade vanadium-titanium microalloyed hot-rolled steel bar and production method thereof

A technology of micro-alloying and production methods, applied in metal rolling and other directions, can solve the problems of high alloy content and high production costs, achieve the effect of stable strengthening, increase utilization rate, and be conducive to sustainable development

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 present invention mainly solves the problem that the alloy content and production cost of the current 600MPa grade high-strength hot-rolled steel bars are too high Problems with good application in

Method used

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  • 600MPa-grade vanadium-titanium microalloyed hot-rolled steel bar and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0070] This example is used to illustrate the 600MPa grade vanadium-titanium microalloyed hot-rolled steel bar and its production method described in the present invention.

[0071] Melt molten iron and scrap steel into molten steel; when the temperature of molten steel reaches 1690°C and the components of molten steel reach C: 0.05%, P: 0.01%, and S: 0.015% 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 reach C: 0.20-0.28% and Si: 0.2% by mass fraction ~0.8%, Mn: 1.0~1.6%, V: 0.05~0.15%; then, add titanium according to the Si, Mn, V content of molten steel, so that the Ti mass fraction reaches 0.05~0.2% and satisfies the relational formula (1): [ Mn]+29.4[Ti]-169.6[Ti] 2 +328.5[Ti] 3 =2.97 and relational formula...

Embodiment 2

[0075] This example is used to illustrate the 600MPa grade vanadium-titanium microalloyed hot-rolled steel bar and its production method described in the present invention.

[0076] Smelting molten iron into molten steel; when the temperature of molten steel reaches 1680°C and the composition of molten steel reaches C: 0.06%, P: 0.02%, and S: 0.024% by mass fraction, the steel is tapped; during the process of tapping 1 / 3 to 3 / 4 In the 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: 0.20%, Si: 0.34%, Mn: 1.6 %, V: 0.11%; then, add ferro-titanium alloy according to the Si, Mn, and V contents of the molten steel, so that the Ti mass fraction reaches 0.05% and satisfies the relationship (1): [Mn]+29.4[Ti]-169.6[Ti] 2 +328.5[Ti] 3 =2.69 and relational formula (2): [V]+[Ti]=0.16; add Ca-containing cored w...

Embodiment 3

[0081] This example is used to illustrate the 600MPa grade vanadium-titanium microalloyed hot-rolled steel bar and its production method described in the present invention.

[0082] Melt scrap steel into molten steel; when the temperature of molten steel reaches 1600°C and the composition of molten steel reaches C: 0.2%, P: 0.04%, and S: 0.01% 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; after tapping is completed, the ladle is transported to the refining station, where silicon is added to the molten steel for deoxidation and alloying; the ladle is bottom-blown with nitrogen at the refining station; first, Adjust the composition of molten steel to achieve C: 0.25%, Si: 0.8%, Mn: 1.12%, V: 0.08% according to the mass fraction; then, add titanium cored wire according to the Si, Mn, and V contents of the molten steel to make the Ti mass fraction reach 0.20...

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Abstract

The invention relates to the technical field of steel production, in particular to a 600MPa-grade vanadium-titanium microalloyed hot-rolled steel bar and a production method thereof. Based on the total mass of the 600MPa-grade vanadium-titanium microalloyed hot-rolled steel bar, the 600MPa-grade vanadium-titanium microalloyed hot-rolled steel bar comprises the following chemical components in percentage by mass: 0.2-0.28% of C, 0.2-0.8% of Si, 1-1.6% of Mn, 0.05-0.15% of V and 0.05-0.20% of Ti, the content of Mn and Ti meets the condition that [Mn] + 29.4 [Ti]-169.6 [Ti] + 328.5 [Ti] < 3.0, and the content of V and Ti meets the condition that [V] + [Ti] is greater than 0.15 and less than 0.3. By limiting the reasonable matching relation of the alloy elements, 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 600MPa vanadium-titanium microalloyed hot-rolled steel bar and a production method thereof. Background technique [0002] Steel bars are the basic materials of modern buildings, widely used in the construction of houses, bridges, roads, etc., and their performance directly affects the life and safety of concrete components. At present, my country is in the rapid development stage of urbanization, real estate and infrastructure construction are booming, and the production and consumption of steel bars rank first in the world. However, whether in the field of construction or infrastructure in my country, 400MPa-grade rebar is still the mainstay. Therefore, promoting the application of 600MPa-grade rebar and promoting the upgrading of rebar will help reduce the amount of steel used, improve project quality, Saving construction costs has very positive significance...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/12C22C38/14B21B1/46C22C33/04C21D8/08
CPCY02P10/20
Inventor 郭跃华王超刘明赵小天邓通武陈亮
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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