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500 MPa-grade V-containing micro-alloyed high-strength-yield-ratio anti-seismic steel bar wire rod and production method thereof

A technology of anti-seismic steel bars and production methods, which is applied in the fields of iron and steel metallurgy and steel rolling, can solve the problems of poor anti-seismic performance of micro-alloy steel bars, and achieve the effect of large yield strength surplus

Inactive Publication Date: 2019-03-15
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem solved by the present invention is that the seismic performance of 500MPa grade micro-alloy steel bars is not good, and it is impossible to ensure the strength index of high yield strength of the steel bar and the seismic performance index of high strength-to-yield ratio.

Method used

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  • 500 MPa-grade V-containing micro-alloyed high-strength-yield-ratio anti-seismic steel bar wire rod and production method thereof
  • 500 MPa-grade V-containing micro-alloyed high-strength-yield-ratio anti-seismic steel bar wire rod and production method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0033] The reinforcing bar of the present embodiment, each component is as shown in table 1, and its preparation method is:

[0034] After pre-desulfurization of molten iron, molten iron and scrap steel are added to a converter with a nominal capacity of 120 tons, and then the top-bottom combined blowing smelting is carried out until the C content in the molten steel is less than 0.06%, and the P and S contents are less than 0.035%. Add FeSi, FeMn, VN16, FeV alloys and anthracite to the molten steel in the process of 1 / 3~2 / 3 to carry out alloying of Si, Mn, V and C elements, among which VN16 alloy is added quantitatively at 0.62kg per ton of steel, and the rest V Then make up with FeV alloy, and control the N content of molten steel to be 0.0100%; after the molten steel reaches the small platform behind the furnace, the ladle is immediately connected to the pipeline, and nitrogen is blown into the molten steel in the ladle for 4 minutes to make the added various The alloy is f...

Embodiment 2

[0036] The reinforcing bar of the present embodiment, each component is as shown in table 1, and its preparation method is:

[0037] After pre-desulfurization of molten iron, molten iron and scrap steel are added to a converter with a nominal capacity of 120 tons, and then the top-bottom combined blowing smelting is carried out until the C content in the molten steel is less than 0.06%, and the P and S contents are less than 0.035%. Add FeSi, FeMn, VN16, FeV alloys and anthracite to the molten steel in the process of 1 / 3~2 / 3 to carry out alloying of Si, Mn, V and C elements, among which VN16 alloy is added quantitatively at 0.68kg per ton of steel, and the rest V Then supplement it with FeV alloy, control the N content of molten steel to be 0.0110%; after the molten steel reaches the small platform behind the furnace, the ladle is immediately connected to the pipeline, and nitrogen is blown into the molten steel in the ladle for 4 minutes to make the added various The alloy is...

Embodiment 3

[0039] The reinforcing bar of the present embodiment, each component is as shown in table 1, and its preparation method is:

[0040] After pre-desulfurization of molten iron, molten iron and scrap steel are added to a converter with a nominal capacity of 120 tons, and then the top-bottom combined blowing smelting is carried out until the C content in the molten steel is less than 0.06%, and the P and S contents are less than 0.035%. Add FeSi, FeMn, VN16, FeV alloys and anthracite to the molten steel in the process of 1 / 3~2 / 3 to carry out alloying of Si, Mn, V and C elements, among which VN16 alloy is added quantitatively at 0.75kg per ton of steel, and the rest V Then make up with FeV alloy, and control the N content of molten steel to be 0.0115%; after molten steel reaches the small platform behind the furnace, the ladle is immediately connected to the pipeline, and nitrogen is blown into the molten steel in the ladle for 4 minutes to make the added various The alloy is fully...

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Abstract

The invention belongs to the field of steel metallurgy and steel rolling, in particular to a 500 MPa-grade V-containing micro-alloyed high-strength-yield-ratio anti-seismic steel bar wire rod and a production method thereof. The technical problem solved by the steel bar wire rod is that an existing 500 MPa-grade vanadium-containing nitrogen-containing alloyed anti-seismic steel bar is low in strength yield ratio. The 500 MPa-grade V-containing micro-alloyed high-strength-yield-ratio anti-seismic steel bar is composed of the following components of 0.20-0.25% of C, 0.35-0.65% of Si, 1.20-1.60%of Mn, 0.070-0.170% of V, and 0.0100-0.0120% of N. The preparation method is characterized in that VN16 and FeV are added in the steel tapping process so as to control the content the V and the N in molten steel to be within a certain range, and meanwhile, a subsequent rolling process is matched. According to the steel bar, the lower yield strength allowance is large, the strength yield ratio canreach 1.45 or above, and the anti-seismic performance is excellent.

Description

technical field [0001] The invention belongs to the field of iron and steel metallurgy and steel rolling, and in particular relates to a 500MPa-level V-containing microalloy high-strength yield ratio anti-seismic steel wire rod and a production method thereof. Background technique [0002] Micro-alloyed steel mainly refers to the steel whose performance can be significantly improved by adding a small or trace amount of one or several elements to the steel, especially the strength index of the steel. Under the existing technical conditions, microalloyed steels are mainly prepared by adding a small or trace amount of vanadium, niobium and titanium. The mechanism of microalloying is: after adding vanadium, niobium and titanium as trace elements into molten steel, they combine with carbon and nitrogen in molten steel to form carbon and nitrogen compound particles, namely V(C, N), Nb( C, N) and Ti (C, N) particles, these particles have a certain effect of precipitation strengthe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/12C22C33/06
CPCC22C33/06C22C38/001C22C38/02C22C38/04C22C38/12
Inventor 郭跃华刘明赵平彭辉
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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