Professional EN10025 S690QL specs manufacturer in China

The addition of Ca element in steel such as EN10025 S690QL specs 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.

Chemical composition differences between the EN10025 S690QL specs, Q345 steel grades (Q345A / Q345B / Q345C / Q345D / Q345E):Q345A steel：C≤0.20, Mn ≤1.70, Si≤0.50, P≤0.035, S≤0.035； Q345B steel：C≤0.20, Mn ≤1.70, Si≤0.50, P≤0.035, S≤0.035； Q345C steel：C≤0.20, Mn ≤1.70, Si≤0.50, P≤0.030, S≤0.030, Al≥0.015； Q345D steel：C≤0.18, Mn ≤1.70, Si≤0.50, P≤0.030, S≤0.025, Al≥0.015； Q345E steel：C≤0.18, Mn ≤1.70, Si≤0.50, P≤0.025, S≤0.020, Al≥0.015； All the Q345 steel grades contain Nb≤0.07, V≤0.15, Ti≤0.20, Cr≤0.30, Ni≤0.012, Mo≤0.10.

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