Hebei Huayang Steel Pipe Co., Ltd is one of the most experienced manufacturers and suppliers of q355b q235b erw pipe in China. Welcome to buy discount q355b q235b erw pipe made in China here from our factory. Quality products and low price are available.
Difference between Q355B and Q235B
1. Different physical properties: Q355B has better strength, plasticity and hardness than Q235B;
2, chemical composition is different: Q355B chemical composition contains titanium, vanadium, chromium, aluminum, manganese and copper, while Q235B only contains chromium, aluminum and manganese;
3. Different applications: Q355B is suitable for manufacturing Bridges, building steel structures, large automobiles and other heavy machinery, etc., while Q235B is more used for constructing pipelines, tracks, etc.;
4, the price is different: because Q355B has better performance, its price is also higher than Q235B.
Q355B is resistant to low temperature of minus 15 degrees. q355b is carbon steel, and carbon steel is generally annealed at low temperature. The purpose is to reduce hardness, increase plasticity, and facilitate mechanical processing. Because carbon steel contains carbon, it does not contain other oxidation resistant alloying elements. So his annealing temperature is below minus 15 degrees. If the temperature is not enough, the workpiece is easy to deform, and the surface of the workpiece is easy to produce oxide, which will damage the workpiece. For the sake of safety, the factory's heat treatment temperature of carbon steel is set at a low temperature of about minus 15 degrees, and it is kept warm after reaching the temperature, and then put into the air to return temperature. So the q355b is resistant to low temperatures of minus 15 degrees.
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