Steel.
Q355B is a material among large-diameter thick-walled steel pipes. A name for seamless steel pipe in the past. It represents that the carbon content in this steel is about 0.16%. Mn is mentioned separately because of the high content of manganese among the five major elements (carbon C, silicon Si, manganese Mn, phosphorus P, sulfur S).
The main characteristics of thick-walled steel pipes: good comprehensive performance, good low-temperature performance, cool stamping performance, good welding performance and good machinability.
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Notes:
1. Using oxygen under low pressure causes negative pressure in the oxygen pipe and clogging of the oxygen lance nozzle hole, which is easily caused by the high temperature molten pool. The generated gas backfired and an explosion occurred. Therefore, oxygen pressure should be closely monitored. When multiple furnaces use oxygen, do not rush to use oxygen to avoid backfire in the pipelines.
2. The raw materials, semi-finished products and finished products required in the Q355B square and rectangular tube steelmaking process all require lifting equipment and locomotives for transportation. There are many dangerous factors in this process. Therefore, when designing the factory, consider enough space, pay attention to equipment innovation, and strengthen maintenance. It is also necessary to improve the operating level of workers and strictly abide by safety production regulations.
3. Molten steel, molten iron, steel slag and the slag at the bottom of the steelmaking furnace are all high-temperature molten materials, which will explode when in contact with water. The main measures to prevent the melt from exploding when it encounters water are to ensure safe water supply to the cooling water system, the water quality must be purified and no leakage is allowed, and the materials, containers, and working places must be dry.
Baidu Encyclopedia-Steel