Metallurgical and Stress State Factors Which Affect the Creep and Fracture Behavior of 9% Cr Steels

Table 4

Chemical composition (given in weight percent) for two exservice steels compared to the requirements in a typical standard specification [23].

Material	C	Cr	Mn	Mo	Ni	Si	Al	P	S	N	Nb	V	Ti	Zr	Cu	Pb	As	Sn	Sb	B	O
SA-387 P91	0.08	8.0	0.30	0.85	0.40 max	0.20	0.02 max	0.020 max	0.010 max	0.030	0.06	0.18	0.01 max	0.01 max	N/A	N/A	N/A	N/A	N/A	N/A	N/A
	0.12	9.5	0.60	1.05		0.50				0.070	0.10	0.25
Damage susceptible heat	0.10	8.77	0.41	0.94	0.12	0.41	0.040	0.009	0.010	0.0454	0.071	0.21	<0.002	<0.002	0.19	0.00075	0.0128	0.008	0.0023	<0.0003	0.003
Damage resistant heat	0.10	8.30	0.40	0.94	0.19	0.33	0.020	0.012	0.002	0.0424	0.070	0.21	<0.002	<0.002	0.05	0.00003	0.0042	0.003	0.00063	<0.0003	0.0024