Different standards and category: 1.Overview of S355NL: S355NL standard: EN 10025-3: 2004 hot rolled products of structural steels - Part 3: hot rolled weldable fine grain structural steel.
2. Overview of S355ML: S355ML steel is a normalized steel (fine-grained steel). EN 10025-4-2004 standard: hot rolled products of structural steels - Part 4: Technical delivery conditions for thermomechanical rolled weldable fine grain structural steels .
3. Overview of Q345: Q345 steel plate is a kind of steel. It is a low-alloy steel widely used in bridges, vehicles, ships, buildings, pressure vessels, special equipment, etc. Standard GB/T1591-2008: high strength low aloy structural steel.
Different characteristics:
1. The characteristics of S355NL: Do shock absorption energy test in a low temperature environment of minus 50 degrees, and the impact value is not less than 27J.
2. The characteristics of S355ML steel : the yield value will decrease as the thickness of the material increases, and the domestic ones may be less than 345MPa, so the strength must be less than 345MPa during mechanical design, otherwise problems will occur.
3. Q345 characteristics: Q345 steel has good comprehensive mechanical properties, acceptable low temperature performance, good plasticity and weldability.
Different applications
1. Purpose of S355NL: It should be used for construction machinery, mining machinery, metallurgy, environmental protection, water conservancy and hydropower and other structural parts.
2. Purpose of S355ML: this material is widely used in bridges, vehicles, ships, buildings, pressure vessels, special equipment, etc.
3. The purpose of Q345: used as medium and low pressure containers, oil tanks, vehicles, cranes, mining machinery, power stations, bridges and other structures that bear dynamic loads, mechanical parts, building structures, general metal structural parts, hot-rolled or normalized , Can be used in various structures in cold regions below -40℃.
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