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Steel plate for for Boiler Pressure Vessel DIN 17155 17 Mn 4 17 Mn 4 steel plate, DIN 17155 17 Mn 4 steel plates is a kind of material for boiler and pressure vessel steel. DIN 17155 17 Mn 4 steel plates is characterised by a minimum yield strength of 220 - 295 MPa and by good weldability,so 17 Mn 4steel is mainly used to for manufacturing boilers, pressure vessels and pipes transporting hot liquids.the following are DIN 17155 17 Mn 4steel plate's Chemical composition and mechanical properties. 17 Mn 4 Chemical analysis -% by mass* (max)