METHOD TO CONTROL RESISTANCE OF PIPE STEELS AGAINST CORROSION CRACKING UNDER STRESS Russian patent published in 2014 - IPC G01N17/02 G01N17/00 

FIELD: measurement equipment.

SUBSTANCE: invention relates to the field of metallurgy, specifically, to control of resistance of pipe steels, designed for operation in aggressive (hydrogen-containing) media, which have corrosion impact at materials. The method to monitor resistance of pipe steels against corrosion cracking under stress consists in the fact that samples are made of steels, in which they determine the total content of hydrogen in the initial state, in the condition after artificial ageing for 10-40 hours under temperatures 50-300°C and after additional thermal treatment at 850-1000°C for 10-60 minutes in a furnace in air atmosphere with subsequent cooling in air, and prior to thermal treatment they provide for moisture of atmosphere in the working space of the furnace of at least 50%. At the same time they decide on resistance of steel against corrosion cracking by variation of hydrogen content in process of ageing and thermal treatment in comparison to its content in the initial state.

EFFECT: provision of information value with short duration of performance of control for resistance against corrosion cracking with account of chemical composition and microstructure, availability and distribution of non-metal inclusions, which are hydrogen traps.