Requirements for chemical composition of EN steel grade S355J2 plates

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EN10028-2 P235GH steel plate is a non-alloy quality steel with high temperature performance, executive standard: EN10028-2. Steel number: 1.0345. EN steel grade S355J2 plates, P235GH pressure vessel steel has good plasticity, toughness, cold bending performance and welding performance. The P235GH presure vessel plate and sheets size, shape and allowable deviation of the steel plate should meet the requirements of EN10028-1 2007 + A1: 2009.

The mechanical properties of 20MnV steel are as follows: tensile strength 785 MPa, yield strength 590 MPa, elongation after fracture 10%, reduction of area 40%, impact absorption energy 55 J. EN steel grade S355J2 plates, 20MnV steel has good properties, good strength, toughness and plasticity, good hardenability and machinability. After carburizing, 20MnV steel can be directly quenched without secondary quenching to improve the core structure. The weldability of 20MnV steel is good, but there is temper brittleness at 300-360 ℃ during heat treatment.

As the thickness and hardness of EN steel grade S355J2 plates increase, the tendency to crack at the cutting edge increases. In order to prevent the EN steel grade S355J2 plates from cutting cracks, preheating should be carried out before EN steel grade S355J2 plates cutting. Special attention should be paid to preheating to make the entire EN steel grade S355J2 plates interface evenly heated to avoid local overheating in the area contacting the heat source. If the whole EN steel grade S355J2 plates cannot be preheated, the partial preheating method can be used instead.

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