Building steel: Building steel can generally be divided into steel for steel structures and steel bars for reinforced concrete structures. Steel structure steel mainly includes ordinary carbon structural steel and low-alloy structural steel. The varieties are section steel, steel pipe and steel bar. There are angle steel, I-beam and channel steel in section steel. Steel bars for reinforced concrete structures can be divided into: hot-rolled steel bars, heat-treated steel bars, cold-drawn steel bars, cold-drawn low-carbon steel wires and steel stranded pipes according to the processing methods; according to the surface shape, they can be divided into smooth steel bars and threads; according to steel varieties It can be divided into low carbon steel, medium carbon steel, high carbon steel and alloy steel.
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Why do our country petroleum import, while constantly exported oil again, and the price is relatively low
2021-07-08 18:39
Our country also has "Persian gulf"? Oil is very rich, it is forbidden to foreigners
2021-07-08 18:36
China aviation fuel oil companies go all out to celebrate the 100th anniversary of the safe oil supply security escort
2021-07-08 18:34
The world is still in the fight for oil, China in the field of new energy in advance occupy the high ground, there is progress
2021-07-08 18:32
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