Difference Between A335 P91 And A213 T91

Dec 19, 2024

A335 Grade P91 Chemical composition (%)

	composition	C	Si	Mn	P	S	Cr	Ni	Mo	N	Ti	V	Nb	Zr	Al	More
Type1	Min	0.08	0.2	0.3	-	-	8	-	0.85	0.03	-	0.18	0.06	-	-	/
Type1	Max	0.12	0.5	0.6	0.02	0.01	9.5	0.4	1.05	0.07	0.01	0.25	0.1	0.01	0.02	/

	composition	C	Si	Mn	P	S	Cr	Ni	Cu	Mo	As	N	Ti	W	V	Nb	Zr	B	Al	Sn	Sb	More
Type2	Min	0.08	0.2	0.3	-	-	8	-	-	0.85	-	0.035	-	-	0.18	0.06	-	-	-	-	-	N/Al≥ 4.0
Type2	Max	0.12	0.4	0.5	0.02	0.005	9.5	0.2	0.1	1.05	0.01	0.07	0.01	0.05	0.25	0.1	0.01	0.001	0.02	0.01	0.003	N/Al≥ 4.0

A213 Grade T91 Chemical composition (%)

	composition	C	Si	Mn	P	S	Cr	Ni	Mo	N	Ti	V	Nb	Zr	Al
Type1	Min	0.07	0.2	0.3	-	-	8	-	0.85	0.03	-	0.18	0.06	-	-
Type1	Max	0.14	0.5	0.6	0.02	0.01	9.5	0.4	1.05	0.07	0.01	0.25	0.1	0.01	0.02

	composition	C	Si	Mn	P	S	Cr	Ni	Cu	Mo	As	N	Ti	W	V	Nb	Zr	B	Al	Sn	Sb	More
Type2	Min	0.08	0.2	0.3	-	-	8	-	-	0.85	-	0.035	-	-	0.18	0.06	-	-	-	-	-	N/Al 4.0 min
Type2	Max	0.12	0.4	0.5	0.02	0.005	9.5	0.2	0.1	1.05	0.01	0.07	0.01	0.05	0.25	0.1	0.01	0.001	0.02	0.01	0.003	N/Al 4.0 min

Applications:

A335P91 alloy pipe is commonly used in high temperature and high pressure environments, such as boiler and superheater pipework in thermal power stations.
SA213T91 is also used in high-temperature and high-pressure environments, but its unique chemical composition gives it improved corrosion and high-temperature resistance, and it is commonly used for piping used in more demanding industrial conditions.