Group 2.7: Austenitic SS 25Cr-20Ni

ASME B16.5-2020 Pressure-Temperature Ratings

Pressure Ratings > Flange > Group 2.7 — Austenitic SS 25Cr-20Ni

Units

Group 2.7: Austenitic SS 25Cr-20Ni

Materials: A182 F310, A240-310H

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 2.7 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	245	635	850	1,270	1,910	3,180	5,300
300	225	580	775	1,160	1,740	2,905	4,840
400	200	540	725	1,085	1,625	2,710	4,520
500	170	515	685	1,025	1,540	2,570	4,280
600	140	495	660	990	1,485	2,470	4,120
650	125	485	645	970	1,455	2,425	4,040
700	110	480	635	955	1,435	2,390	3,980
750	95	470	625	940	1,410	2,350	3,920
800	80	465	620	930	1,395	2,330	3,880
850	65	460	610	915	1,375	2,290	3,820
900	50	450	600	900	1,350	2,245	3,745
950	35	385	515	775	1,160	1,930	3,220
1000	20	365	485	725	1,090	1,820	3,030
1050	—	355	470	705	1,060	1,765	2,945
1100	—	260	345	520	780	1,305	2,170
1150	—	190	250	375	565	945	1,570
1200	—	135	185	275	410	685	1,145
1250	—	105	135	205	310	515	855
1300	—	75	100	150	225	375	630
1350	—	60	80	115	175	290	485
1400	—	45	60	90	135	225	370
1450	—	35	45	65	100	165	275
1500	—	25	35	50	75	130	215

Matching Pipe Materials — MAWP Calculators

A312 TP310S

ASTM A312 TP310S SS Pipe Smls 25Cr-20Ni

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 2.5 Group 3.1 →

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