Carbon structural steel ① by the Q + digital + quality rating symbols + deoxy method symbols. Its steel dubbed "Q", on behalf of the steel yield point, h-beam price, behind the numbers indicate the yield point value, the unit is MPa yield point such as Q235 (σs) of 235 MPa of carbon steel. ② when necessary, can be marked symbols representing steel quality level and deoxygenation methods. Quality rating symbols are A, B, C, D. Deoxy method symbols: F indicates boiling steel; b represents a half-killed steel: Z represents killed steel; TZ represents special killed steel, killed steel may mark symbol, Z and TZ can not marked. For example Q235-AF represents A-level boiling steel. Carbon steel ③ special purpose, such as bridges steel, marine steel, basically carbon structural steel representation, but the last letter in the steel additional express purpose Meanwhile, the supply of iron ore mines overseas also In further increased. Recently, Hefei h steel, mining giant BHP Billiton released the third quarter ended September 30, 2013 production data showed third-quarter iron ore production of BHP Billiton was 48.85 million tons, up by 23 percent, a record high. Moreover, according to data released by Rio Tinto and FMG display, Rio Tinto in Australia and Canada in the third quarter iron ore production was 68.3 million tons, up by 2%; FMG third quarter iron ore production was 34.9 million tons, up an increase of 91%. h steel price, exhibition of Commerce Bo (certification), Hefei h beam provided by the Hefei exhibition Bo Trading Company. Hefei Show Bo Trading Company (www.hfzhanbo.com) (www.hfzhanbo.com) is Hefei, steel leaders, over the years, the company implement the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customers needs. In the exhibition of Commerce Bo leadership with the staff warmly welcome all inquiries negotiations to create the exhibition of Commerce Bo better future.