Stress Corrosion Cracking of Steel and Aluminum in Sodium Hydroxide: Field Failure and Laboratory Test

Table 1

(a) Chemical composition analysis results of steel materials [12]. (b) Chemical composition analysis results of aluminum alloys.

(a)

% wt.	Field failure case study			Ferrite-pearlite tube
	Ferrite-pearlite tube	Martensite tube	Austenite tube	Ferrite-pearlite tube	Martensite tube	Austenite tube
C	0.274	0.494	0.164	0.382		0.093
Si	0.178	0.167	0.044	0.149		0.437
Mn	0.462	0.379	0.896	0.263		0.672
P	0.016	0.019	0.032	0.011		0.041
S	0.022	0.030	0.021	0.028		0.028
Cr	Negligible	negligible	12.128	negligible		13.427
Fe	Balance	Balance	Balance	Balance		Balance

(b)

% wt.	Field failure sample	Laboratory sample
Si	0.692	0.674
Fe	0.223	0.280
Cu	0.044	0.041
Cr	0.033	0.031
Ni	0.009	0.007
Al	Balance	Balance