Numerical Study of Hydrogen Trapping: Application to an API 5L X60 Steel

Table 3

Calculated diffusion and trapping parameters from the permeation rising transients for the API 5L X60 AR steel condition.

Rising transient
Temperature	𝐷app	𝑖ss	Δ𝐺	𝑁	Deviation
°C	cm^2/s	A/cm^2	KJ/mol	mol H/cm^3	%
30	4.06×10^−6	1.28×10^−7	−56.4	1.42×10^−8	1.18
30	4.27×10^−6	1.28×10^−7	−56.3	1.45×10^−8	1.26
50	7.53×10^−6	3.13×10^−7	−60.9	4.24×10^−9	0.87
70	1.73×10^−5	6.12×10^−7	−62.4	3.08×10^−9	0.58