ASTM A350 LF2 Applied to ASME BPVC

Code applicability & Maximum Temperature Limits

Both Class 1 and Class 2 of ASTM A350/ ASME SA-350 Gr. LF2 can be used for applications in accordance with a set of ASME Boiler and Pressure Vessel Codes. These applicable Codes and maximum temperature limits are tabulated in the table below. The UNS number of Gr. LF2 is K03011; P-number is 1; Group number is 2.

ASME Section	I	III Class 2 & Class 3	VIII Div. 1	XII
Temp.	454	371	538	343
ASME Section	III Div.1 Cl. 1 & MC	III Div.3 Cl. TC & SC	VIII Div. 2, Cl. 1	VII Div. 2
Temp.	371	371	371	538

*Temp.: maximum temperature limits, in °C.

Allowable Stresses at Elevated Temperatures

Temp.	S	Temp.	S
40	138	350	122
65	138	375	117
100	138	400	101
125	138	425	83.9
150	138	450	67.0
200	138	475	51.1
250	136	500	33.6
300	129	525	21.3
325	125	550	12.9

*S: maximum allowable stresses for ASTM A350/ ASME SA-350 LF2 applied to Section I; Section III, Classes 2 and 3; Section VIII, Division 1; and Section XII. Temp.: metal temperature, °C, not exceeding.

Temp.	Sm	Temp.	Sm
40	161	250	136
65	156	300	129
100	151	325	125
125	148	350	122
150	146	375	118
200	142	-	-

*S_m: design stress intensity values for ASTM A350/ ASME SA-350 LF2 applied to Section III, Division 1, Classes 1 and MC; Section III, Division 3, Classes TC and SC; Section VIII, Division 2, Class 1. Temp.: metal temperature, °C, not exceeding.

Temp.	S	Temp.	S
40	165	325	125
65	156	350	122
100	151	375	113
125	148	400	95.1
150	146	425	79.5
175	144	450	62.6
200	142	475	45.0
225	139	500	31.7
250	136	525	21.4
275	133	550	14.2
300	129	-	-

*S: maximum allowable stresses for ASTM A350/ ASME SA-350 LF2 applied to Section VIII, Division 2. Temp.: metal temperature, °C, not exceeding.