Large-specification fine-grain high-strength anti-seismic reinforcement steel bars and preparation method thereof

Abstract

The invention discloses theta 28-36mm HRB600 high-strength anti-seismic reinforcement steel bars for a hydropower project. The reinforcement steel bars are characterized in that steel comprises the following chemical components by weight: C 0.23-0.26wt%, Si 0.50-0.65wt%, Mn 1.45-1.55wt%, S 0.025-0.035wt%, P 0.030-0.040wt%, Cr 0.12-0.18wt%, Mo 0.020-0.035wt%, V 0.125-0.140wt%, and the balance beingFe and inevitable impurities. The invention also discloses a preparation method of the large-specification HRB600 high-strength anti-seismic reinforcement steel bars. A vanadium, chromium and molybdenum composite microalloying process is adopted, microalloying strengthening elements such as vanadium-nitrogen alloy, ferrochromium and ferromolybdenum are added into the steel, and the low final rolling temperature is controlled by a pre-penetrating water-controlled cooling device (4.9m in length) in the steel rolling process, the formation and precipitation of fine and dispersed microalloy carbon (nitrogen) secondary phase are promoted, and the toughness is obviously improved during improvement of steel strength. The reinforcement steel bars can be used for sdam and flood control tunnel construction engineering and road and bridge engineering of the Jinshajiang hydropower station, and has the advantages of low production cost, strong process applicability, reliable operation, stable product and the like.

Description

Technical field

[0001] The invention relates to a large-size fine-grained high-strength seismic steel bar and a preparation method thereof, in particular to a large-size Φ28-36mm HRB600 high-strength controlled-rolled steel bar for hydropower station engineering and a preparation method thereof, and also relates to a production of HRB400E fine-grain high-strength steel with a nominal diameter of 32-40mm Method for preparing tough seismic steel bars. Background technique

[0002] Large-size HRB500 and HRB600 high-strength seismic steel bars are required for large-scale HRB500 and HRB600 high-strength seismic steel bars, such as dams, flood control tunnels, and bridges of Yumo Railway, and mechanical or sleeve connection must be used during construction. The steel bars currently on the market have different microalloying elements used by steel mills to reduce production costs, different rolling process parameters, and different methods of controlled cooling after rolling. The quali...

Images