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HRB700 steel bar and production method thereof

A production method and steel bar technology, applied in HRB700 steel bar and its production field, can solve the problem of waste of alloy elements, and achieve the effects of high elongation, increased structural strength, and easy mass production.

Active Publication Date: 2014-05-28
LAIWU IRON & STEEL GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the production of seismic steel bars in most enterprises is still at the level of HRB335 and HRB400, and there are not many enterprises that can produce HRB500. Up to now, no relevant reports about seismic steel bars of HRB700 have been found, only Chenggang and Jinan Iron and Steel reported. The successful development of HRB600, and the content of microalloying element V in the development of HRB600 steel bars reached 0.17%~0.20%, resulting in a serious waste of alloying elements

Method used

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  • HRB700 steel bar and production method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The method for producing the HRB700 steel bar includes a smelting process, a refining process, a continuous casting process and a rolling process. The specific steps of each process will be described below.

[0029] In the smelting process, the converter or electric furnace is used to smelt molten steel and alloy the ladle. In the ladle alloying step, in addition to adding silicon-manganese and ferrosilicon alloys, vanadium-nitrogen alloys are also added, so that the N content in the molten steel composition reaches 0.021%, and the V content reaches 0.11%.

[0030] In the LF refining process, after the ladle arrives at the refining position, slagging and deoxidation are carried out according to the temperature and slag condition. After the slag turns white, micro-nitrogen alloy silicon nitride is added, so that the N content in the molten steel composition reaches 0.023%, and the white slag remains for 25 minutes. , After the temperature of the ingredients is appropria...

Embodiment 2

[0034] The method for producing the HRB700 steel bar includes a smelting process, a refining process, a continuous casting process and a rolling process. The specific steps of each process will be described below.

[0035] In the smelting process, the converter or electric furnace is used to smelt molten steel and alloy the ladle. In the ladle alloying step, in addition to adding silicon-manganese and ferrosilicon alloys, vanadium-nitrogen alloys are also added, so that the N content in the molten steel composition reaches 0.029%, and the V content reaches 0.10%.

[0036] In the LF refining process, after the ladle reaches the refining position, slagging and deoxidation are carried out according to the temperature and slag condition, and the micro-nitrogen alloy silicon nitride is added after the slag turns white, so that the N content in the molten steel composition reaches 0.031%, and the white slag remains for 20 minutes , After the temperature of the ingredients is approp...

Embodiment 3

[0040]The method for producing the HRB700 steel bar includes a smelting process, a refining process, a continuous casting process and a rolling process. The specific steps of each process will be described below.

[0041] In the smelting process, the molten steel is first smelted in a converter or an electric furnace and alloyed in a ladle. In the ladle alloying step, in addition to silicon-manganese and ferrosilicon alloys, vanadium-nitrogen alloys are also added, so that the N content in the molten steel composition reaches 0.026%, and the V content reaches 0.10%.

[0042] In the LF refining process, after the ladle reaches the refining position, slagging and deoxidation are carried out according to the temperature and slag condition, and the micro-nitrogen alloy silicon nitride is added after the slag turns white, so that the N content in the molten steel composition reaches 0.028%, and the white slag remains for 25 minutes , After the temperature of the ingredients is app...

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Abstract

The invention discloses an HRB700 steel bar and a production method thereof. The steel bar comprises the following elements in percentage by weight: 0.20-0.28% of C, 1.50-1.80% of Mn, 0.30-0.80% of Si, 0.08-0.12% of V, 0.020-0.040% of N, at most 0.030% of S, at most 0.030% of P, and the balance of Fe and inevitable impurities. The production method comprises the steps of smelting refining, continuous casting and rolling, wherein in the smelting step, a vanadium-nitrogen alloy is utilized to perform microalloying on molten steel in the ladle; and in the refining step, a micro-nitrogen alloy is added to increase the nitrogen content, so that the finally obtained HRB700 steel bar contains 0.08-0.12 wt% of V and 0.020-0.040 wt% of N. The steel bar has the advantages of high-yield strength, tensile strength, high elongation percentage and low production cost.

Description

technical field [0001] The invention relates to a steel bar and a production method thereof, in particular to a HRB700 steel bar and a production method thereof. Background technique [0002] At present, the buildings of various countries in the world have been developing towards large scale. In order to improve the safety of large buildings, the foreign construction industry has generally adopted steel bars with good welding performance and high strength. For example, Western Europe and North America mainly use 400MPa and 500MPa grades with high strength. rebar. In 1993, Russia added 500MPa and 600MPa steel bars to the steel product standards, and in 1996, the United States added 520MPa steel bars to the steel bar product standards. In my country, 500MPa-grade threaded steel bars are mainly used in high-rise buildings, ports, and expressways. Many domestic steel mills have researched and developed 500MPa grade rebar. The promotion and application of high-strength steel b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/12C22C33/06C21C7/00
Inventor 杜传治梁辉郭锟江洪广
Owner LAIWU IRON & STEEL GRP
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