F6NM - 1.4313 - X3CrNiMo13-4
F6NM - X3CrNiMo13-4 - 1.4313 is a soft martensitic chrome-nickel-steel with molybdenum addition in quenched and tempered condition which is rust proof. It is used in a temperature range from - 60°C to +300°C because of its good toughness properties.
The material is well polishable. It has a good corrosion resistance in a moderate corrosive environment which has no chloride. The surface condition has a large part in the corrosion resistance. The resistance of this material is much better with polished surface than the same material with rough surface.
F6NM can be hardened by holding the temperature between 950°C and 1050° C with a subsequent cooling in air, oil or polymer. The strength of 1.4313 depends on the tempering temperature. F6NM is usually divided in three heat treatment conditions, QT650, QT780 and QT900. This material is used in the oil industry and power plant construction.