Patent ID: 6197131
Filing Date: 2001-03-06
Classification: G01N

Abstract:
A method for determining the susceptibility of steels to hydrogen corrosion and embrittlement behaviour in the presence of H.sub.2 S, comprising:determining a characteristic value l.sub.0 which is a function of the proportion of dislocations present in the lattice of a first steel sample treated under hardening conditions such that, after the hardening treatment, by quenching and tempering or by work hardening, the hardness of said steel reaches a maximum value at a threshold stress .sigma..sub.threshold such that .sigma..sub.threshold equals k.R.sub.p0.2 k being less than or equal to Rp.sub.0.2 of said steel,determining a characteristic value l.sub.1 which is a function of the proportion of dislocations present in the lattice of a second treated steel sample,comparing l.sub.1 and l.sub.0, and if l.sub.1 is less than or equal to l.sub.0, the treated steel of the second sample is said to be non sensitive to hydrogen corrosion and embrittlement in the presence of H.sub.2 S according to the criterion defined by the value of k.