630MPa high-strength seismic resistance index rebar and production method thereof
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A 630mpa, high-strength technology, applied in metal rolling, manufacturing tools, metal processing equipment, etc., can solve the problem that the production process is difficult to meet the 630MPa strength and seismic requirements, and the production cost is high, and achieves comprehensive performance. economic effect
Active Publication Date: 2019-12-13
江苏联峰实业有限公司
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[0005] The embodiment of the present invention provides a 630MPa high-strength anti-seismic index steel bar and its production method, which solves the technica
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[0037] Example one
[0038] figure 1 It is a schematic flow diagram of a method for producing a 630MPa high-strength seismic index steel bar in an embodiment of the present invention. Such as figure 1 As shown, the embodiment of the present invention provides a method for producing a 630 MPa high-strength seismic index steel bar, the method including:
[0039] Step 10: Refining raw materials for steelmaking 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: Roll the refined molten steel by a continuous casting machine to obtain a continuous cast steel billet.
[0042] Step 40: After the continuous casting steel billet is transported to the heating furnace for heating, it enters the rack rough rolling train for rough rolling operation to obtain the rough rolled steel billet.
[0043] Further, before conveying the continuous casting billet to a heating furnace fo...
Example Embodiment
[0060] Example two
[0061] The embodiment of the present invention provides a 630MPa high-strength seismic index steel bar, which is suitable for the production method described in the first embodiment. The 630MPa high-strength seismic index steel bar is composed of: 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%, the rest is Fe and unavoidable impurities.
[0062] Further, the crystal grains in the 630 MPa high-strength seismic index steel bar are not greater than 4 μm.
[0063] Further, the strength of the 630 MPa high-strength seismic index steel bar is 630 MPa.
[0064] Specifically, the strength of the 630MPa high-strength seismic index steel bar in 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% by weight, Si: 0.50-0.70%, and Mn: 1.40-1.60%, S≤0.030%, P≤0.030%, V: 0.010-0.120%, Nb: 0.015-0.025%, N: 0....
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Abstract
The invention provides a 630MPa high-strength seismic resistance index rebar and a production method of the 630MPa high-strength seismic resistance index rebar. The production method comprises the steps that steelmaking raw materials are processed through a converter, so that rough molten steel is obtained; the refining operation is conducted through a refining furnace, so that refined molten steel is obtained; the rolling operation is conducted through a continuous casting machine, so that a continuous casting steel billet is obtained; after the continuous casting steel billet is conveyed toa heating furnace and heated, the steel billet enters a rough rolling unit of a machine frame and is subjected to the rough rolling operation, so that a rough rolled steel billet is obtained; after the rough rolled steel billet is cut and broken, the steel billet enters an intermediate rolling unit of the machine frame and is subjected to the intermediate rolling operation; after the steel billetis processed in a pre-water-cooling section, and the low-temperature finish rolling operation is accomplished, the steel billet is cut and broken, enters a finish rolling unit of the machine frame andis subjected to the finish rolling operation; and after a finish rolled steel billet is cooled and cut, the steel billet is subjected to the finishing operation and is stored. The technical problemsthat the adopted production technology is difficult to meet the 630MPa-strength seismic resistance requirement, and the production cost is high are solved. The technical effects that chemical components and the rolling technology are adjusted on the basis of an ordinary rebar, various index requirements of a high-performance rebar are met, the industrial rolling technology is stable, the cost is reduced, and the benefit is improved are achieved.
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 ...
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