What does steel grade S690QL rockwell hardness mean

Steel production and rolling technology and equipment also pursue the continuity between processes, such as the continuous S690QL rockwell hardness process between continuous casting and rolling mills, continuous casting slabs hot transfer hot charging, increased direct rolling, and continuous cold rolling processes. The development of controlled rolling and controlled cooling technology that combines rolling and heat treatment has played a huge role in improving the properties of rolled materials.

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EN10113 S275M is a technical delivery conditions for thermomechanical rolled weldable fine grain structural steels.S means the structural steel, M means the delivery condition.Capital letter L for the quality with specified minimum values of values of impact energy. S690QL rockwell hardness. The EN10113 S275M steel is equivalent to DIN StE285TM, UNI FeE275KGTM..

According to the data released by the world iron and Steel Association, the world pig iron production in March 2020 was 103 million tons, a year-on-year decrease of 3.5%, a year-on-year increase of 1.8% in February, and the overseas pig iron S690QL rockwell hardness production excluding China was 36.309 million tons, a year-on-year decrease of 11%.

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