What is the role of welding preheating for en10025 S355ML

The addition of Ca element in steel such as en10025 S355ML can refine grain size, partly desulphurize and change the composition, quantity and morphology of non-metallic inclusions. It is similar to that of adding rare earth in steel. It can improve the corrosion resistance, wear resistance, high temperature and low temperature resistance of steel, improve the impact toughness, fatigue strength, plasticity and welding performance of the steel, and increase the cold heading, shock resistance, hardness and contact endurance strength of the steel.

Q345 is a grade of carbon structural steel. Q is the meaning of yield strength, which en10025 S355ML 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.

Tokyo (Reuters) - Japan's crude steel production is expected to fall 25.9% in the April June quarter from a year earlier, the Ministry of economy, trade and industry said on Thursday. The Ministry of economy and industry quoted an industry survey report as saying that the demand for steel products (including export products) in April June is expected to drop 18.1% to 18.28 million tons from the same period last year. At the same time, en10025 S355ML and so on steel exports in the current quarter will decline by 21.4% year-on-year.