18MnD5 steel plate for nuclear power

18MnD5 plate is nuclear steel plate, equivalent to American standard SA533 GrB Cl1.

Delivery status of 18MnD5 steel plate: quenched Q+tempered T (quenched and tempered)
Quenching: after heating and holding the steel plate, rapidly cool it in water, oil or other inorganic salts and other media.

Tempering: keep the steel plate at a proper temperature for a long time before cooling.

Rolling process description of 18MnD5 steel plate:
Raw scrap iron and raw steel → electric furnace 90 or 100 tons electric arc → LF furnace molten steel polishing → ladle vacuum treatment VD or VOD → mold casting/continuous casting → large slab electroslag furnace → heating continuous and soaking furnace → steel plate rolling 4100 and 4200mm rolling mill → flaw detection and steel plate heat treatment → steel plate quality inspection
Thickness deviation of 18MnD5 steel plate: N, A, B, C
Type N deviation: positive deviation and negative deviation are equal.
Class A deviation: determine the negative deviation according to the nominal thickness.
Class B deviation: fixed negative deviation is 0.3.
Class C deviation: the fixed negative deviation is 0, and the positive deviation is determined according to the nominal thickness.

18MnD5 steel plate flaw detection standard: EN10160-S3E4
Flaw detection: also known as ultrasonic inspection, it is an inspection method for the internal quality of steel plate. At the same time, it can also detect the internal defects of metal, such as hidden cracks, pores, trachoma and impurities.

Application of 18MnD5 steel plate:
18MnD5 steel is mainly used for the manufacture of the safety injection tank of the nuclear-grade equipment. It is used for the manufacture of evaporator, pressurizer, pressure vessel and head in the nuclear power project.