Stainless Steel 316 Flanges | Stainless Steel 316L Flanges

Standards & Materials

Compared to SS 304/ 304L flanges, stainless steel 316/ 316L flanges have enhanced resistance to pitting corrosion in chloride environments due to the addition of molybdenum. The letter “L” denotes low carbon content. According to ASME B16.5 and ASME B16.47, SS 316/ 316L flanges may be made from forgings of ASTM A182 Grade F316 or F316L, castings of ASTM A351 Grades CF8M or CF3M, and plates of ASTM A240 Grades 316 or 316L. Designated with nominal composition of 16Cr-12Ni-2Mo, the flange materials can be classified into two groups based on its pressure-temperature ratings: Group 2.2 – including ASTM A182 F316, ASTM A351 CF8M & CF3M, and ASTM A240 Gr. 316; Group 2.3 – including ASTM A182 F316L and ASTM A240 Gr. 316L.

SS 316/ 316L flanges can be furnished in diverse types such as welding neck, slip on, blind, socket welding, lap joint, threaded, and reducing, etc. Flanges of ASME B16.5 may be provided in sizes 1/2″ through 24″ in Class 150, 300, 400, 600, 900, 1500, 2500. Flanges of ASME B16.47 Series A may be provided in sizes 26″ through 60″ in Class 150, 300, 400, 600, 900; while flanges of ASME B16.47 Series B may be provided in sizes 26″ through 60 in Class 75, 150, 300, 400, 600, 900.

Manufacture & Heat Treatment

Stainless steel 316/ 316L flanges may be made by a hot forging or casting process. Blind or slip-on plate flanges without hub may be machined directly from plates. The flanges shall be solution treated at a temperature no less than 1900°F [1040°C], followed by a quench in cold water or other rapid cooling means.

Chemical Composition Requirements

Element	F316	F316L
C	≤0.08	≤0.03
Mn	≤2.00	≤2.00
P	≤0.045	≤0.045
S	≤0.030	≤0.030
Si	≤1.00	≤1.00
Ni	10.0-14.0	10.0-15.0
Cr	16.0-18.0	16.0-18.0
Mo	2.00-3.00	2.00-3.00
N	≤0.10	≤0.10

*Composition requirements for ASTM A182 Gr. F316 & F316L.

Element	CF8M	CF3M
C	≤0.08	≤0.03
Mn	≤1.50	≤1.50
P	≤0.04	≤0.04
S	≤0.04	≤0.04
Si	≤1.50	≤1.50
Ni	9.0-12.0	9.0-13.0
Cr	18.0-21.0	17.0-21.0
Mo	2.0-3.0	2.0-3.0

*Composition requirements for ASTM A351 Gr. CF8M & CF3M.

Element	316	316L
C	≤0.08	≤0.03
Mn	≤2.00	≤2.00
P	≤0.045	≤0.045
S	≤0.030	≤0.030
Si	≤0.75	≤0.75
Ni	10.0-14.0	10.0-14.0
Cr	16.0-18.0	16.0-18.0
Mo	2.00-3.00	2.00-3.00
N	≤0.10	≤0.10

*Composition requirements for ASTM A240 Gr. 316 & 316L.

Mechanical Properties

Mechanical Requirements	F316	F316L
Tensile Strength min. MPa [ksi]	515 [75]	485 [70]
Yield Strength min. MPa [ksi]	205 [30]	170 [25]
Elongation in 2", min. %	30	30
Reduction of area, min. %	50	50

*Tensile requirements for ASTM A182 F316 & F316L.

Mechanical Requirements	CF8M	CF3M
Tensile Strength min. MPa [ksi]	485 [70]	485 [70]
Yield Strength min. MPa [ksi]	205 [30]	205 [30]
Elongation in 2", min. %	30	30

*Tensile requirements for ASTM A351 CF8M & CF3M.

Mechanical Requirements	Gr. 316	Gr. 316L
Tensile Strength min. MPa [ksi]	515 [75]	485 [70]
Yield Strength min. MPa [ksi]	205 [30]	170 [25]
Elongation in 2", min. %	40	40
Brinell Hardness max. HBW	217	217
Rockwell Hardness max. HRBW	95	95

*Tensile & hardness requirements for ASTM A240 Gr. 316 & 316L.

Pressure-Temperature Ratings

Temp. °F	75# psi	150# psi	300# psi
-20~100	140	275	720
200	120	235	620
300	105	215	560
400	100	195	515
500	85	170	480
600	70	140	450
650	60	125	440
700	-	110	435
750	-	95	425
800	-	80	420
850	-	65	420
900	-	50	415
950	-	35	385
1000	-	20	365
1050	-	-	360
1100	-	-	305
1150	-	-	235
1200	-	-	185
1250	-	-	145
1300	-	-	115
1350	-	-	95
1400	-	-	75
1450	-	-	60
1500	-	-	40

*Pressure-Temperature ratings for SS 316/ 316L flange materials in Group 2.2, for Class 75, Class 150, and Class 300.

Temp. °F	400# psi	600# psi	900# psi
-20~100	960	1440	2160
200	825	1240	1860
300	745	1120	1680
400	685	1025	1540
500	635	955	1435
600	600	900	1355
650	590	885	1325
700	580	870	1305
750	570	855	1280
800	565	845	1265
850	555	835	1255
900	555	830	1245
950	515	775	1160
1000	485	725	1090
1050	480	720	1080
1100	405	610	915
1150	315	475	710
1200	245	370	555
1250	195	295	440
1300	155	235	350
1350	130	190	290
1400	100	150	225
1450	80	115	175
1500	55	85	125

*Pressure-Temperature ratings for SS 316/ 316L flange materials in Group 2.2, for Class 400, Class 600, and Class 900.

Temp. °F	1500# psi	2500# psi
-20~100	3600	6000
200	3095	5160
300	2795	4660
400	2570	4280
500	2390	3980
600	2255	3760
650	2210	3680
700	2170	3620
750	2135	3560
800	2110	3520
850	2090	3480
900	2075	3460
950	1930	3220
1000	1820	3030
1050	1800	3000
1100	1525	2545
1150	1185	1970
1200	925	1545
1250	735	1230
1300	585	970
1350	480	800
1400	380	630
1450	290	485
1500	205	345

*Pressure-Temperature ratings for SS 316/ 316L flange materials in Group 2.2, for Class 1500 and Class 2500.

Temp. °F	75# psi	150# psi	300# psi
-20~100	115	230	600
200	100	195	510
300	85	175	455
400	80	160	420
500	75	150	395
600	70	140	370
650	60	125	365
700	-	110	360
750	-	95	355
800	-	80	345
850	-	65	340

Pressure-Temperature ratings for SS 316/ 316L flange materials in Group 2.3, for Class 75, Class 150, and Class 300.

Temp. °F	400# psi	600# psi	900# psi
-20~100	800	1200	1800
200	680	1020	1535
300	610	910	1370
400	560	840	1260
500	525	785	1180
600	495	745	1115
650	485	730	1095
700	480	720	1080
750	470	705	1060
800	460	690	1035
850	450	675	1015

*Pressure-Temperature ratings for SS 316/ 316L flange materials in Group 2.3, for Class 400, Class 600, and Class 900.

Temp. °F	1500# psi	2500# psi
-20~100	3000	5000
200	2555	4260
300	2280	3800
400	2100	3500
500	1970	3280
600	1860	3100
650	1825	3040
700	1800	3000
750	1765	2940
800	1730	2880
850	1690	2820

*Pressure-Temperature ratings for SS 316/ 316L flange materials in Group 2.3, for Class 1500 and Class 2500.