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HRB500E fine grain anti-seismic steel bar and production method thereof

A technology of anti-seismic steel bars and production methods, which is applied in the direction of temperature control, etc., can solve the problems of occupying the profit space of enterprises, the large amount of micro-alloying, and the increase in consumption of vanadium-nitrogen alloys, etc., and achieve the realization of a conservation-oriented society, stable mechanical properties, and economical production. significant effect

Active Publication Date: 2012-05-02
WUKUN STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the main problems existing in the existing production process are: 1. At present, the price of microalloys such as vanadium alloys and ferroniobium is relatively high, and the amount of microalloys added in the steelmaking process is too large, resulting in high production costs and completely occupying the enterprise Profit margins are not conducive to improving the competitiveness of enterprises
2. Due to the high cost of producing HRB500 and HRB500E high-strength steel bars by conventional micro-alloying process, the production motivation of enterprises is insufficient, and the output cannot be scaled up, so it is not conducive to the promotion and application of HRB500 and HRB500E steel bars
3. The reserves of ferroniobium and vanadium-nitrogen alloy mineral resources, which are important national strategic reserves, are very limited. The conventional production process has greatly increased the consumption of micro-alloyed ferroniobium and vanadium-nitrogen alloys, and the reserves of ferroniobium and vanadium-nitrogen alloy mineral resources have declined sharply , not conducive to the protection of rare mineral resources and the ecological environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A. Steel slabs with the following chemical compositions: C: 0.20%, Si: 0.33%, Mn: 1.43%, Nb: 0.018%, S: 0.021%, P: 0.027%, and the rest are Fe and unavoidable impurities;

[0026] B. Send the above billet into a heating furnace with a furnace temperature of 1110°C, and when heated to a billet temperature of 1010°C, send it to a rolling mill for rolling. During rolling, rough rolling is carried out for 65 seconds at a rolling speed of 1.2m / s , followed by rolling for 80 seconds at a speed of 3.5 m / s, and finally finish rolling for 75 seconds at a speed of 14 m / s;

[0027] C, the finishing rolled steel product of B step is 350m in cooling water 3 / h, under the condition of cooling water pressure of 1.8MPa, rapid cooling for 3 seconds to obtain steel with a temperature of 880 ° C, and then placed in the air to cool to room temperature naturally, that is, the HRB500E fine-grained high-performance seismic steel bar with a specification of Φ12mm was obtained , The chemical c...

Embodiment 2

[0029] A. Steel slabs with the following chemical compositions: C: 0.24%, Si: 0.36%, Mn: 1.53%, Nb: 0.020%, S: 0.016%, P: 0.023%, and the rest are Fe and unavoidable impurities;

[0030] B. Send the above billet into a heating furnace with a furnace temperature of 1160°C. When the billet is heated to a temperature of 1060°C, it is sent to a rolling mill for rolling. During rolling, rough rolling is carried out for 75 seconds at a rolling speed of 1m / s. , after that, under the rolling condition of 5m / s, the middle rolling was carried out for 68 seconds, and finally, the finishing rolling was carried out for 70 seconds under the rolling condition of 9m / s;

[0031] C, the finish-rolled steel product of B step is 410m in cooling water total water 3 / h, under the condition of cooling water pressure of 2.4MPa, rapid cooling for 1 second to obtain steel with a temperature of 870°C, which is naturally air-cooled to room temperature on the cooling bed, collected and bundled, and the HR...

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Abstract

The invention provides an HRB500E fine grain anti-seismic steel bar which is characterized by comprising the following chemical compositions: C: 0.20-0.25 percent by weight, Si: 0.20-0.45 percent by weight, Mn: 1.35-1.60 percent by weight, Nb: not more than 0.022 percent by weight, S: not more than 0.045 percent by weight, P: not more than 0.045 percent by weight and the balance of Fe and inevitable impurities. The production method thereof only needs to add a very small amount of ferro-niobium and a small amount of nitride intensifier in the steel-making process and then uses the controlled cooling method after rolling in the steel rolling production process to obtain the fine grain anti-seismic steel bar with stable mechanical performances and first-grade anti-seismic qualified rate of being more than 98.0 percent, thereby solving the welding effect of the fine grain high-tensile steel bar and other problems; in addition, the Si content in steel is controlled at a lower level, the consumption of silicon iron is significantly reduced; compared with the prior art, the adding amount of micro-alloy is greatly reduced, thereby being conductive to protecting rare mineral resources andreducing cost.

Description

technical field [0001] The invention relates to a fine-grain anti-seismic steel bar, in particular to a HRB500E fine-grain anti-seismic steel bar and a production method thereof, belonging to the technical field of metal material processing and forming. Background technique [0002] Hot-rolled ribbed steel bar is the main reinforcement material of reinforced concrete building structure, which bears tensile and compressive stress and strain in the structure, high cycle or low cycle fatigue effect, high temperature or cold brittle effect, physical or chemical corrosion, steel bar reprocessing effect , Various loads such as welding, mechanical connection, bending or straightening, etc., enable concrete to meet various functional requirements and have a wide range of applications. With the emergence of high-rise, long-span, earthquake-resistant, low-temperature-resistant, and fire-resistant building structures, steel bars are required to have higher comprehensive properties such...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/12C22C38/04C21D8/08B21B37/74
Inventor 苏鹤洲陈伟庾郁梅李金柱张卫强赵宇王斌
Owner WUKUN STEEL