Can 19Mn6 steel plate replace 20 and 25 steel?

19Mn6 steel plate is the German standard number for high temperature structural steel, which is equivalent to the national standard Q345R and European standard P355GH. 19Mn6 steel plate is mainly used for the production of power station boiler drums.

Study whether 19Mn6 steel plate can be used as boiler forgings instead of 20, 25 steel after forging and heat treatment. Through the analysis of the chemical composition, mechanical properties and metallographic structure of the raw materials, determine whether it meets the national standards, and then carry out cutting, forging and heat treatment , Sampling, tests and organization performance analysis found that the performance indicators of 19Mn6 steel plate forgings can meet the inspection standards and can be used instead of 20 and 25 steel for forgings.

And it is determined that the forging temperature of 19Mn6 steel plate forgings is: heating temperature 1200℃, holding time 1 min.mm-1, initial forging temperature 1100～1150℃, final forging temperature ≥850℃, air cooling after forging, normalizing heat treatment after forging, heating The temperature is 910～940℃, and the holding time is 1 min.mm-1 air cooling.