Stress Corrosion Cracking Behavior of TP 439 and 690 TT under Film-Forming Amine Environment

Table 2

The mechanical properties obtained from the SSRT test.

Material	Environment	Temperature /°C	Maximum tensile strength /MPa	Elongation rate /%	Rate of reduction in area /%	Absorption area before fracture	Sensitivity index
TP 439	FA	260	388	21.9	48.6	91	6%
TP 439	Non-FA	260	388	11.4	53.6	89	8%
TP 439	Argon	260	412	27.1	89.1	97	/
690 TT	FA	284	570	45.4	70.6	245	9%
690 TT	Non-FA	284	568	39.0	68.8	242	11%
690 TT	Argon	284	661	45.4	53.8	272	/

The stress corrosion sensitivity index is calculated based on the fracture absorption energy.