Group 2.4: Austenitic SS 18Cr-10Ni-Ti

ASME B16.5-2020 Pressure-Temperature Ratings

Pressure Ratings > Flange > Group 2.4 — Austenitic SS 18Cr-10Ni-Ti

Units

Group 2.4: Austenitic SS 18Cr-10Ni-Ti

Materials: A182 F321/F321H, A240-321/321H

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 2.4 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	250	650	865	1,295	1,945	3,240	5,400
300	230	595	795	1,190	1,785	2,975	4,960
400	200	550	735	1,105	1,655	2,760	4,600
500	170	515	690	1,030	1,550	2,580	4,300
600	140	485	650	975	1,460	2,435	4,060
650	125	475	635	950	1,425	2,375	3,960
700	110	465	620	930	1,395	2,330	3,880
750	95	460	610	915	1,375	2,290	3,820
800	80	450	600	900	1,355	2,255	3,760
850	65	445	595	895	1,340	2,230	3,720
900	50	440	590	885	1,325	2,210	3,680
950	35	385	515	775	1,160	1,930	3,220
1000	20	365	485	725	1,090	1,820	3,030
1050	—	360	480	720	1,080	1,800	3,000
1100	—	310	415	625	935	1,560	2,600
1150	—	235	315	475	710	1,185	1,970
1200	—	185	245	370	555	925	1,545
1250	—	140	185	280	420	705	1,170
1300	—	110	145	220	330	550	915
1350	—	85	115	170	255	430	715
1400	—	65	85	130	195	325	545
1450	—	50	70	105	155	255	430
1500	—	40	50	75	115	190	315

Matching Pipe Materials — MAWP Calculators

A312 TP321

ASTM A312 TP321 SS Pipe Smls 18Cr-10Ni-Ti, <=3/8" thk.

Wall thickness <= 3/8 in.

A312 TP321

ASTM A312 TP321 SS Pipe Smls 18Cr-10Ni-Ti, >3/8" thk.

Wall thickness > 3/8 in.

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 2.3 Group 2.5 →

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