1. Brand: S355 steel plate
2. Characteristics: S355 low carbon alloy steel, S355NL is the normalized steel (fine grain steel) in the EN10025-3:2004 standard. Its yield strength and tensile strength correspond to my country's Q345 low alloy steel. NL is required in Conduct an impact absorption energy test in a low temperature environment of minus 50 degrees Celsius, and the impact value is not less than 27J.
3. The difference between S355 and Q345B: What is the difference in welding? SS355 is slightly stronger than Q345B, but the welding is exactly the same.
4. Chemical composition of S355: Chemical composition of S355: S355 low alloy structural steel, S355 composition carbon (C) ≤ 0.24; phosphorus (P), sulfur (S) ≤ 0.04. Return to Sohu to see more
S355 steel in China is a low-alloy high-strength structural steel with a hardness of 70-80B and a yield strength between 300-400MPa.
The steel grade of thick steel plate is roughly the same as that of thin steel plate. In all aspects of products, in addition to bridge steel plates, boiler steel plates, automobile steel plates, pressure vessel steel plates and multi-layer high-pressure vessel steel plates, which are purely thick plates, some types of steel plates such as automobile girder steel plates (thickness 2.5~10 mm), patterned steel plates (thickness 2.5~8 mm), stainless steel plates, heat-resistant steel plates and other varieties are intersected with thin plates
S355 steel plate introduction:
(1) Low hardenability. Under normal circumstances, the maximum quenching diameter of carbon steel water quenching is only 10mm-20mm.
(2) The strength and yield ratio are low. For example, the σs of ordinary carbon steel Q235 steel is 235MPa, while the σs of low alloy structural steel 16Mn is more than 360MPa. The σs /σb of 40 steel is only 0.43, which is much lower than alloy steel.
(3) Poor tempering stability. Due to poor tempering stability, when carbon steel is quenched and tempered, in order to ensure higher strength, a lower tempering temperature needs to be used, so that the toughness of the steel is low; in order to ensure better toughness, a high tempering temperature is used The strength is low, so the comprehensive mechanical properties of carbon steel are not high.
(4) Unable to meet special performance requirements. Carbon steel is often poor in oxidation resistance, corrosion resistance, heat resistance, low temperature resistance, wear resistance and special electromagnetic properties, and cannot meet the needs of special performance.
