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A kind of 630mpa high-strength anti-seismic index steel bar and its production method

A production method, 630MPa technology, applied in the direction of manufacturing tools, metal rolling, metal rolling, etc., can solve the problems of high production cost, difficult production process to meet the seismic requirements of 630MPa strength, to save steel consumption and improve products Variety structure, the effect of improving technical effects

Active Publication Date: 2021-03-05
江苏联峰实业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The embodiment of the present invention provides a 630MPa high-strength anti-seismic index steel bar and its production method, which solves the technical problem that the production process adopted in the prior art is difficult to meet the 630MPa strength anti-seismic requirement and the production cost is high

Method used

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  • A kind of 630mpa high-strength anti-seismic index steel bar and its production method

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Effect test

Embodiment 1

[0038] figure 1 It is a schematic flowchart of a method for producing 630MPa high-strength seismic index steel bars in an embodiment of the present invention. Such as figure 1 As shown, the embodiment of the present invention provides a method for producing 630MPa high-strength seismic index steel bars, the method comprising:

[0039] Step 10: Refining steelmaking raw materials through a converter to obtain crude molten steel.

[0040] Step 20: Refining the crude molten steel through a refining furnace to obtain refined molten steel.

[0041] Step 30: rolling the refined molten steel by a continuous casting machine to obtain a continuous casting billet.

[0042] Step 40: After the continuous casting billet is transported to the heating furnace for heating, it enters the rack rough rolling unit for rough rolling operation to obtain the rough rolled billet.

[0043] Further, before transporting the continuous casting billet to the heating furnace for heating, it includes: in...

Embodiment 2

[0061] The embodiment of the present invention provides a 630MPa high-strength anti-seismic index steel bar, which is suitable for the production method described in Example 1. The composition ratio of the 630MPa high-strength anti-seismic index steel bar is: C: 0.25-0.28%, Si: 0.50- 0.70%, Mn: 1.40-1.60%, S≤0.030%, P≤0.030%, V: 0.010-0.120%, Nb: 0.015-0.025%, N: 0.026-0.033%, and the rest are Fe and unavoidable impurities.

[0062] Further, the crystal grains in the 630MPa high-strength anti-seismic index steel bar are not larger than 4 μm.

[0063] Further, the strength of the 630MPa high-strength seismic index steel bar is 630MPa.

[0064]Specifically, the strength of the 630MPa high-strength seismic index steel bar of the embodiment of the present invention is 630MPa, which meets the requirements of high-strength steel bars, and its chemical composition is C: 0.25-0.28%, Si: 0.50-0.70%, Mn: 1.40-1.60%, S≤0.030%, P≤0.030%, V: 0.010-0.120%, Nb: 0.015-0.025%, N: 0.026-0.033%...

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Abstract

The invention provides a 630MPa high-strength anti-seismic index steel bar and a production method thereof, including: refining steel raw materials through a converter to obtain crude molten steel; refining through a refining furnace to obtain refined molten steel; The rolling mill is rolled to obtain continuous casting billets; after being transported to the heating furnace for heating, it enters the rack rough rolling unit for rough rolling operation to obtain rough rolled billets; after shearing and breaking, it enters the rack intermediate rolling group for intermediate rolling , After the pre-water cooling section realizes low temperature finishing rolling, it is sheared and broken, and then enters the finishing rolling unit of the stand for finishing rolling operation. It is difficult to solve the adopted production process to meet the 630MPa strength and anti-seismic requirements, and there is a technical problem of high production cost. To achieve the technical effect of adjusting the chemical composition and rolling process on the basis of ordinary steel bars, meeting the requirements of various indicators of high-performance steel bars, stable industrial rolling technology, reducing costs and increasing profits.

Description

technical field [0001] The invention relates to the technical field of steel bar manufacturing technology, in particular to a 630MPa high-strength anti-seismic index steel bar and a production method thereof. Background technique [0002] At present, the HRB400(E) and HRB500(E) steel bars on the market are saturated, and there will be no improvement in the short term. However, there is a market for high-strength steel bars of 630MPa and above, and 630MPa high-strength steel bars are currently the highest-grade steel bars in China. , Widely used in various building structures, especially large, heavy, light thin-walled and high-rise building structures. Compared with 600MPa grade steel bars, the use of 630MPa grade and above high-strength steel bars has a higher strength guarantee. Compared with 400MPa grade and 500MPa grade steel bars, the use of 630MPa grade and above high-strength steel bars can save 50% and 20% of steel consumption. Its development and application will ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/12C21D8/08B21B1/46B21B1/16B21B15/00
CPCB21B1/163B21B1/466B21B15/0007B21B2015/0014C21D8/08C22C38/02C22C38/04C22C38/12
Inventor 马正洪王云川黄沁彭勇周聪王哲彭家清包遵广
Owner 江苏联峰实业有限公司
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