500MPa-grade aseismic microalloy steel bar containing V and Nb and having high strength-yield ratio and production method thereof

A technology for seismic-resistant 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 seismic performance of micro-alloy steel bars, and achieves a high yield strength with a large margin of yield strength, a balance between yield strength and strength-to-yield ratio, and a high yield. Effect

Inactive Publication Date: 2019-01-22
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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  • 500MPa-grade aseismic microalloy steel bar containing V and Nb and having high strength-yield ratio and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The reinforcing bar of the present embodiment, each component is as shown in table 1, and its preparation method is:

[0032] 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, FeV alloys and anthracite to the molten steel in the process of 1 / 3 to 2 / 3 to carry out alloying of Si, Mn, V and C elements, and control the V content of the molten steel to 0.040%; the molten steel reaches the small platform behind the furnace Afterwards, the ladle is connected to the pipeline immediately, and nitrogen gas is blown into the molten steel in the ladle for 4 minutes to fully melt and uniform the various alloys added; after the ladle reaches the LF furnace, it is electrically heated, and after refining in the LF furnac...

Embodiment 2

[0034] The reinforcing bar of the present embodiment, each component is as shown in table 1, and its preparation method is:

[0035] 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, FeV alloys and anthracite to the molten steel in the process of 1 / 3 to 2 / 3 to alloy Si, Mn, V and C elements, and control the V content of the molten steel to 0.060%; the molten steel reaches the small platform behind the furnace Afterwards, the ladle is connected to the pipeline immediately, and nitrogen gas is blown into the molten steel in the ladle for 4 minutes to fully melt and uniform the various alloys added; after the ladle reaches the LF furnace, it is electrically heated, and after refining in the LF furnace, it is heated ...

Embodiment 3

[0037] The reinforcing bar of the present embodiment, each component is as shown in table 1, and its preparation method is:

[0038] 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, FeV alloys and anthracite to the molten steel in the process of 1 / 3 to 2 / 3 to carry out alloying of Si, Mn, V and C elements, and control the V content of the molten steel to 0.080%; the molten steel reaches the small platform behind the furnace Afterwards, the ladle is connected to the pipeline immediately, and nitrogen gas is blown into the molten steel in the ladle for 4 minutes to fully melt and uniform the various alloys added; after the ladle reaches the LF furnace, it is electrically heated, and after refining in the LF furnac...

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Abstract

The invention belongs to the field of iron and steel metallurgy and steel rolling, particularly relates to a 500MPa-grade aseismic microalloy steel bar containing V and Nb and having a high strength-yield ratio and a production method thereof, and aims to solve the technical problem of low strength-yield ratio of the existing 500MPa-grade aseismic alloy steel bar containing vanadium and nitrogen.The aseismic steel bar containing V and Nb is prepared from the following components: 0.20-0.25% of C, 0.35-0.65% of Si, 1.20-1.60% of Mn, 0.040-0.080% of V, 0.010-0.030% of Nb and 0.0250-0.0350% of N. FeV is added in a steel tapping process and is used for controlling the content of V; cored wires containing Nb and N are fed in a refining process of a ladle furnace (LF), so that the contents of Nb and N can be adjusted; meanwhile, a subsequent rolling process is matched. The produced steel bar is high in lower yield strength surplus and excellent in aseismic performance; the strength-yield ratio of the steel bar reaches 1.40 or above.

Description

technical field [0001] The invention belongs to the fields of iron and steel metallurgy and steel rolling, and in particular relates to a 500MPa-grade V- and Nb-containing microalloy high-strength yield-ratio anti-seismic steel bar 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 stren...

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 郭跃华刘明冉准彭辉
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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