Hot-continuous-rolled steel strip for 500 MPa-grade earthquake-proof construction structure and production method thereof
A technology for building structures and production methods, which is applied in the field of 500MPa grade vanadium-titanium micro-alloyed hot continuous-rolled steel strips for seismic building structures, can solve the problems of high alloy cost, poor equipment and process adaptability, undisclosed equipment conditions, etc. Low cost, narrow intensity fluctuation range, low cost effect
Inactive Publication Date: 2018-03-20
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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Problems solved by technology
The anti-seismic steel prepared by this invention adds a large number of microalloying elements to increase the weather resistance and hardenability of the steel plate, and the cost of the alloy is high. At the same time, the invention does not disclose the equipment conditions, and its equipment and process adaptability is poor
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Embodiment
[0031] The steel for 500MPa-level earthquake-resistant building structures adopts the composition route of vanadium-titanium microalloying, and is produced by a 2050 hot rolling line in a steel plant; while the comparative example adopts the composition route of C-Mn steel, and the layer cooling adopts the front-stage cooling method, and the steel ( plate) with layer cooling and then air cooling directly. Table 1 is the chemical composition of the embodiment of the present invention, Table 2 is the control value of the hot rolling process, and Table 3 is the mechanical properties of the steel coil. Use GB / T 228-2010, GB / T 232-2010 for testing.
[0032] The chemical composition of table 1 embodiment
[0033]
[0034] The hot rolling process control value of table 2 embodiment
[0035]
[0036] The mechanical property of the steel coil of table 3 embodiment
[0037]
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Abstract
The invention belongs to the field of metal plate strip production, and in particular, relates to a hot-continuous-rolled steel strip for a 500 MPa-grade earthquake-proof construction structure and aproduction method thereof. The hot-continuous-rolled steel strip for the 500 MPa-grade earthquake-proof construction structure comprises the following chemical components in percentage by weight: 0.12-0.20% of C, 0.15-0.30% of Si, 1.20-1.60% of Mn, 0.05-0.10% of V, 0.010-0.035% of Ti, P not more than 0.020%, S not more than 0.015%, 0.020-0.060% of Als, and the balance of Fe and inevitable impurities. In the hot-continuous-rolled steel strip for the 500 MPa-grade earthquake-proof construction structure, the yield strength is 500-630 MPa, the tensile strength is 610-770 MPa, the yield ratio is not more than 0.81, the ductility is not less than 24%, the 0-DEG C impact power is not less than 54 J, the yield platform length is not less than 2.2%, the carbon equivalent Ceq is not more than 0.45%, and the welding crack sensitivity index Pcm is not more than 0.28%.
Description
technical field [0001] The invention belongs to the field of metal strip production, and in particular relates to a 500MPa grade vanadium-titanium microalloyed hot-rolled steel strip for anti-seismic building structures and a production method. Background technique [0002] In recent years, due to the remarkable characteristics of industrialization, greening and informatization, steel structure buildings have attracted more and more attention from governments at all levels, and steel structure green buildings have risen to the level of national development strategies and vigorously promoted. In the context of increasing downward pressure on the national economy, serious excess steel production capacity, and extremely severe operating conditions for steel companies, the development of steel-structured green buildings has undoubtedly become an important direction for the structural transformation and capacity upgrade of the steel industry. Among them, the steel used in modern ...
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IPC IPC(8): C22C38/02C22C38/04C22C38/12C22C38/14C22C38/06C21D8/02
CPCC22C38/02C21D8/0226C21D2211/005C21D2211/009C22C38/04C22C38/06C22C38/12C22C38/14
Inventor 罗许李俊洪刘韶华刘序江肖强
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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