The news of the discontinuation of the production of secondary reinforcement has been released for a long time. From the current implementation situation, the use of secondary reinforcement has been stopped in most areas of the country, but there are still small areas using secondary reinforcement. Therefore, the current implementation effect of the discontinuation of production of secondary reinforcement still needs a period of time to be fully realized. The so-called secondary reinforcement is H. RB335 reinforcing bar is inferior to the three-grade reinforcing bar in chemical composition and performance. But it is cheaper than the third grade steel bar in price.
Compared with the second-grade steel bar, the third-grade steel bar still has the advantages of relatively strong height, toughness, weldability and seismic performance. In addition, replacing the second-grade steel bar with the third-grade steel bar can also reduce the consumption of steel, save the use of iron ore, coke, electricity and reduce the emission of carbon dioxide, waste gas and dust. Therefore, from the perspective of the favorable factors in this respect, it is imperative to stop production of secondary reinforcement.
According to the trend analysis in recent years, the output and application of high-strength steel bars in our country are increasing year by year, but the progress is not fast. According to the results of market analysis, 60% of the construction steel bars in our country are secondary screw steel, and only about 30% are tertiary screw steel bars and above. Overseas use of high-strength steel bars is relatively common, the amount is generally 70% - 80%, of which 400 MPa of steel bars are the main.
On the whole, the final result of the discontinuation of secondary reinforcement still needs an adaptive process. It is obviously unrealistic to control it by a single prohibition of market sales. The key point is to start with the research of major steel plants. Only steel plants do not produce secondary reinforcement anymore. Even if secondary reinforcement appears in engineer's design drawings, it will not be available for purchase. Only in this way can market demand be cut off to the greatest extent.
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