The iron oxide defects on the surface of EN S460M steel

With the increase of temperature, the yield limit of EN S460M steel will decrease monotonically, but the tensile strength of EN S460M steel will rise to a high peak value at a certain temperature, and then decrease. This peak temperature is called the blue brittleness temperature of EN S460M steel. Near the blue brittleness temperature, the EN S460M steel strength increases and the plasticity decreases. The elongation and section shrinkage of EN S460M steel increase with the increase of temperature, but there is a low peak at the blue brittleness temperature. The blue brittleness temperature of low carbon steel ranges from 200 ℃ to 250 ℃. The blue brittleness of low alloy steel is not obvious as that of low carbon steel, and the blue brittleness temperature is higher.

The addition of Ca element in steel such as EN S460M steel 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.

Steel material has an irreplaceable role in many projects, especially in building construction, bridge cofferdams, road construction, foundation pit support, garden engineering, excavator paving, subgrade engineering and other projects. Therefore, the quality of EN S460M steel steel material can not be ignored, so how should customers identify the authenticity of steel when choosing steel materials? Today we would like to analyze it together. So that it can help you to purchase satisfied steel materials in the future.

Since 2020, the foreign trade industry has been significantly affected by the epidemic. In the first two months of this year, China's EN S460M steel and so on steel exports totaled 7.811 million tons, down 27% year-on-year, the largest decline since March 2018. In terms of steel foreign trade, China is mainly a steel exporting country, with less steel imports.