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Method for preparing chloride ion corrosion resistant quake-proof bar
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A bar and carbon steel technology is applied in the field of preparation of chloride ion corrosion-resistant and shock-resistant bars, which can solve the problems of accelerated corrosion of steel bars, volume expansion, expensive alloying elements, and reduction of concrete strength, etc., and achieves comprehensive mechanical properties improvement. The effect of saving alloying elements and low cost
Inactive Publication Date: 2012-10-03
SHANGHAI UNIV +1
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3. Intensity reduction: corrosive substances penetrate further from the cracks, accelerate the corrosion and volume expansion of steel bars, thereby reducing the strength of concrete
That is, in the steelmaking process, trace elements such as V, Ti, and Nb are added to achieve the purpose of fine-grain strengthening and precipitation strengthening, thereby improving the comprehensive mechanical properties of the bar. However, due to the high price of alloying elements, this method has no cost advantage
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Embodiment 1
[0020] Take several pieces of ordinary carbon steel Q275 (specification 20×10×2.0mm), polish the surface with metallographic sandpaper, wash with absolute ethanol and acetone in sequence, dry, and place in a desiccator for later use.
[0021] The steel adopts fast rolling speed, the rolling start temperature is 900°C, the cooling process parameters are temperature 800°C, the cooling gradient is 2°C / s, the cooling time is 2min, and the cooling method is water cooling.
Embodiment 2
[0023] Take several pieces of ordinary carbon steel Q275 (specification 20×10×2.0mm), polish the surface with metallographic sandpaper, wash with absolute ethanol and acetone in sequence, dry, and place in a desiccator for later use.
[0024] The steel adopts normal rolling speed, the rolling start temperature is 900°C, the cooling process parameters are temperature 900°C, the cooling gradient is 20°C / s, the cooling time is 10min, and the cooling method is water cooling.
Embodiment 3
[0026] Take several pieces of ordinary carbon steel Q235 (specification 20×10×2.0mm), polish the surface with metallographic sandpaper, wash with absolute ethanol and acetone in sequence, dry, and place in a desiccator for later use.
[0027] The steel adopts fast rolling speed, the rolling start temperature is 900°C, the cooling process parameters are temperature 850°C, the temperature drop gradient is 10°C / s, the cooling time is 5min, and there is no cooling method.
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Abstract
The invention relates to a method for preparing a chloride ion corrosion resistant quake-proof bar, comprising the following steps of: (1) washing a common carbon steel bar with anhydrous alcohol and acetone, and then drying; (2) setting the starting rolling temperature of rough rolling to be 900-930 DEG C, controlling the finishing rolling temperature to be 920-950 DEG C, and setting two temperature control points on a rolling line, wherein the first point is set between a rough mill and a heating furnace, the second point is set at a pre-precision rolling outlet, and the finishing rolling temperature is controlled by utilizing a controllable water cooling box; and (3) enhancing the steel strength through after-rolling controlling and cooling to obtain the chloride ion corrosion resistant quake-proof bar. The method for preparing the chloride ion corrosion resistant quake-proof bar has simple process and low cost, ensures that the common carbon steel bar sigmas reaches more than 500MPa under the condition of not adding microalloy elements, such as Nb, V, Ti and the like, and saves expensive alloy element; and the prepared bar has greatly improved comprehensive mechanical property, better strength and toughness and favorable application prospect.
Description
technical field [0001] The invention belongs to the field of preparation of carbon steel rods, in particular to a preparation method of chloride ion corrosion-resistant and shock-resistant rods. Background technique [0002] The 21st century is the century of the ocean, and there are abundant resources in the ocean. In today's increasingly prominent conflicts between global food, resource, and energy supply shortages and rapid population growth, the development and utilization of abundant resources in the ocean has become an inevitable trend of historical development. Under the ever-increasing pressure of survival, countries around the world are trying to find strategies to improve the quality of life and sustainable development. Coastal countries have turned their attention to the ocean, stepped up the formulation of ocean development plans, vigorously developed marine high-tech, strengthened naval construction, strengthened ocean management, and continuously accelerated t...
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