EN10025-3 S355N low alloy high strength steel plate is a kind of steel plate with high strength and low alloy content. It is widely used in various fields due to its excellent mechanical properties and good welding performance.

The chemical composition of EN10025-3 S355N steel plate meets the requirements of EN10025-3 standard, which ensures its good mechanical properties and low alloy content. The main chemical elements in this steel are carbon, silicon, manganese, sulfur, phosphorus and other trace elements.碳当量CE是指钢铁中化合物的总和占比较多的非特意加入的合金元素的碳、硅、锰、硫、磷等元素与特意加入的合金元素的总和之比，用百分比表示。碳当量对焊接性有较大影响，通常随着碳当量的增加，钢材的焊接性会变差，容易导致焊接时出现裂纹、气孔等缺陷。因此，在EN10025-3标准中，碳当量被限制在一定的范围内，以保证钢材具有良好的焊接性能。

EN10025-3 S355N steel plate has good mechanical properties, such as high tensile strength, good toughness and impact resistance, etc. It can be used in various structural members, such as beams, columns, plates and other parts of the structure. In addition, due to its good welding performance, it is also suitable for welding structures.

The heat treatment state of EN10025-3 S355N steel plate can be divided into three states: quenching and tempering state, quenching state and tempering state. The quenching and tempering state has the best mechanical properties, but the production process is more complex and the cost is higher. The quenching state has higher strength but lower toughness, and it needs to be tempered at a higher temperature to obtain better toughness. The tempering state has lower strength and toughness than the quenching and tempering state, but the production process is simple and the cost is lower.

The impact resistance of EN10025-3 S355N steel plate at low temperature is better than that of ordinary carbon steel plate. In order to meet the requirements of use at low temperature, it needs to undergo low temperature impact testing. The test shows that the impact energy of EN10025-3 S355N steel plate at low temperature is higher than that of ordinary carbon steel plate, which can meet the requirements of use at low temperature.

EN10025-3 S355N steel plate is widely used in various fields, such as building construction, bridge construction, heavy machinery manufacturing, power plants, shipbuilding and other fields. In building construction, it can be used as beams, columns, floor slabs and other structural members. In bridge construction, it can be used as bridge piers, beams and other structural members. In heavy machinery manufacturing, it can be used as pressure vessels, boilers and other pressure equipment. In power plants, it can be used as steam turbine casings, generator frames and other parts. In shipbuilding, it can be used as hull plates, structural members and other parts.

A few years ago, a power plant in northern China used EN10025-3 S355N steel plate to replace ordinary carbon steel plate for steam turbine casing manufacturing. This casing needed to bear high pressure and temperature, and also needed to withstand the erosion of water vapor and steam. The EN10025-3 S355N steel plate has excellent mechanical properties and wear resistance, which can fully meet the needs of this application. In this case, the EN10025-3 S355N steel plate was supplied by a European steel manufacturer and was transported to China for use in the power plant project.