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Steel is produced by a small rolling mill, rolling mill main types are divided into: continuous and semi continuous and open train. New and used in the world, mostly continuous small rolling mill. Popular steel mills have universal high-speed rolling mills and 4 slitting high yield mills.s
The raw steel billet for the production of threaded steel is carbon structural steel or low alloy structural steel which is treated by calm melting, and the finished steel bar is delivered in hot rolling forming, normalizing or hot rolling state.s
The brand of steel is expressed in terms of Arabia numerals or Arabia numerals plus English letters. HRB335, HRB400 and HRB500 are represented by 3, 4 and 5, respectively. HRBF335, HRBF400 and HRBF500 are represented by C3, C4 and C5 respectively. The name of the factory is expressed in Chinese phonetic prefix. Nominal diameter mm Arabia digital representation.s
There are two levels of steel rebar, three steel, four steel grade difference, no grade steel, there are a lot of customers to wire (round) mistakenly called a steel. At present, China is gradually out of grade two steel, four steel grade two steel grade HRB335, three grade steel grade HRB400, four grade of steel wire is HRB500, (Pan Yuan) new material grades are HPB195, HPB235, HPB300, old wire material grades corresponding is Q195, Q235.s
The thread has 3 different contracts, which have been completed. They are continuous thread (1211 contract) and thread four (1303 contract). 1305 into the thread, even Sihui next month, into the thread, it will continue until April 13 years.s
According to statistics, China's construction industry accounts for about 50% of the total steel consumption. As one of the resources consuming industries, the construction industry must adjust the consumption structure of construction materials, energetically apply high-strength steel bars and high-performance coagulation, and take the road of economical development. If the current use of steel and concrete to raise an intensity level, it can bring enormous savings to society. For example, by calculation, according to the standard requirements, if the reinforced concrete leading force steel strength increased to 400-500N/mm2, then can be in the current level of steel consumption to save about 10%.s