Group 2.1: Austenitic SS 18Cr-8Ni

ASME B16.5-2020 Pressure-Temperature Ratings

Pressure Ratings > Flange > Group 2.1 — Austenitic SS 18Cr-8Ni

Units

Group 2.1: Austenitic SS 18Cr-8Ni

Materials: A182 F304/F304H, A351 CF3/CF8, A240-304/304H

Pressure-Temperature Curve

Class 150
Class 1500
Class 2500
Class 300
Class 400
Class 600
Class 900

Interpolation Calculator

Calculate allowable working pressure at any intermediate temperature by linear interpolation.

Class

Temperature

Group 2.1 Pressure-Temperature Ratings (psig)

Temp (°F)	Class 150	Class 300	Class 400	Class 600	Class 900	Class 1500	Class 2500
−20	275	720	960	1,440	2,160	3,600	6,000
100	275	720	960	1,440	2,160	3,600	6,000
200	230	600	800	1,200	1,800	3,000	5,000
300	205	540	715	1,075	1,615	2,690	4,480
400	190	495	660	995	1,490	2,485	4,140
500	170	465	620	930	1,395	2,330	3,880
600	140	440	590	885	1,325	2,210	3,680
650	125	430	575	865	1,295	2,160	3,600
700	110	420	565	845	1,265	2,110	3,520
750	95	415	550	825	1,240	2,065	3,440
800	80	405	540	810	1,215	2,030	3,380
850	65	395	530	790	1,190	1,980	3,300
900	50	390	520	780	1,165	1,945	3,240
950	35	380	510	765	1,145	1,910	3,180
1000	20	355	470	710	1,065	1,770	2,950
1050	—	325	435	650	975	1,630	2,715
1100	—	255	345	515	770	1,285	2,145
1150	—	205	275	410	615	1,030	1,715
1200	—	165	220	330	495	825	1,370
1250	—	135	180	265	400	670	1,115
1300	—	115	150	225	340	565	945
1350	—	95	125	185	280	465	770
1400	—	75	100	150	225	380	630
1450	—	60	80	115	175	290	485
1500	—	40	55	85	125	205	345

Matching Pipe Materials — MAWP Calculators

A312 TP304

ASTM A312 TP304 SS Pipe Smls 18Cr-8Ni

Disclaimer: This chart is for guidance only. The data is from ASME B16.5-2020 and shall not be used for design without verification against the current edition of the standard. Ambient ratings apply from −20 °F (−29 °C) to 100 °F (38 °C). Rows highlighted in blue indicate the ambient temperature range.

← Group 1.15 Group 2.2 →

References

ASME B16.5-2020 — Pipe Flanges and Flanged Fittings: NPS ½ Through NPS 24 Metric/Inch Standard
Pressure ratings are maximum allowable non-shock working pressures (psig or bar gauge)
Intermediate temperatures may be interpolated linearly between tabulated values
Ratings apply to flanged fittings of the designated class, including flanges, flanged valves, and flanged end fittings
For temperatures below −20 °F (−29 °C), consult ASME B16.5 for specific material limitations