What is S355JR carbon steel plate sheet steel specification

Q345 is a grade of carbon structural steel. Q is the meaning of yield strength, which S355JR carbon steel plate sheet is taken from the initial of Chinese Pinyin of "Qu"; 345 is the value of yield point, in MPa. Q345 refers to carbon structural steel with yield point (σ s) of 345mpa. The following letters indicate the quality level, including A, B, C, D and E. Q345 steel has good comprehensive mechanical properties, low temperature performance, good plasticity and weldability. Q345 steel is usually in hot rolling or normalizing state.

According to South Korea newsis reported on March 12, Korea iron and steel association statistics show that in February, South Korea's domestic S355JR carbon steel plate sheet steel exports to 2.44 million tons, down 2.4 percent year on year, after January down 3 percent, the second consecutive month of decline. In the past three years, South Korea's steel exports have decreased year by year, from 31.67 million tons in 2017 to 30.44 million tons in 2018 and 30.38 million tons in 2019. Instead, South Korea's S355JR carbon steel plate sheet steel imports increased last year. As China's economy slows and steel prices fall, Chinese steel is pouring into South Korea, analysts say.

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Welded steel pipes are made by crimping steel plates, bending them into a circle, and then welding the joints together. Seamless steel pipe is directly processed by round steel piercing or hot rolling process, so there is no weld on the outer surface. The performance of seamless steel pipe is better than that of welded steel pipe, and the price of seamless steel pipe is also higher. There are some differences in chemical composition between S355JR carbon steel plate sheet, welded steel pipe and seamless steel pipe. The material of welded steel pipe contains the chemical composition suitable for welding.