STEEL PRODUCT WITH TWO LAYERS WITH DIFFERENT HARDNESS AND METHOD OF ITS MANUFACTURING Russian patent published in 2016 - IPC C21D9/42 F41H5/04 B32B15/18 

FIELD: metallurgy.

SUBSTANCE: invention relates to metallurgy. To increase the mechanical and ballistic properties the steel product is manufactured containing first air hardened alloyed steel with first hardness, metallurgically linked with the second air hardened alloyed steel with second hardness. The method of steel product manufacturing out of two layers with different hardness includes creation of the first component out of alloyed steel air hardened, that contains the first mating surface and has hardness of the first component, and creation of the second component out of alloyed steel air hardened, that contains the second mating surface and has hardness of the second component. The first component out of the air hardened alloyed steel is metallurgically connected with the second component out of the air hardened alloyed steel to form the metallurgically connected package. The metallurgically connected package is subjected to hot rolling to create the metallurgical connection between the first mating surface and the second mating surface.

EFFECT: increased mechanical and ballistic properties.

25 cl, 2 dwg, 2 tbl, 1 ex