Group 1.14: Alloy Steel 9Cr-1Mo

ASME B16.5-2020 Pressure-Temperature Ratings

Pressure Ratings > Flange > Group 1.14 — Alloy Steel 9Cr-1Mo

Units

Group 1.14: Alloy Steel 9Cr-1Mo

Materials: A182 F9, A217 C12

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 1.14 Pressure-Temperature Ratings (psig)

Temp (°F)	Class 150	Class 300	Class 400	Class 600	Class 900	Class 1500	Class 2500
−20	290	750	1,000	1,500	2,250	3,750	6,250
100	290	750	1,000	1,500	2,250	3,750	6,250
200	260	750	1,000	1,500	2,250	3,750	6,250
300	230	730	970	1,455	2,185	3,640	6,070
400	200	705	940	1,410	2,115	3,530	5,880
500	170	665	885	1,330	1,995	3,325	5,540
600	140	605	805	1,210	1,815	3,025	5,040
650	125	590	785	1,175	1,765	2,940	4,905
700	110	570	755	1,135	1,705	2,840	4,730
750	95	530	710	1,065	1,595	2,660	4,430
800	80	510	675	1,015	1,525	2,540	4,230
850	65	485	650	975	1,460	2,435	4,060
900	50	450	600	900	1,350	2,245	3,745
950	35	375	505	755	1,130	1,885	3,145
1000	20	255	340	505	760	1,270	2,115
1050	—	170	230	345	515	855	1,430
1100	—	115	150	225	340	565	945
1150	—	75	100	150	225	375	630
1200	—	50	70	105	155	255	430

Matching Pipe Materials — MAWP Calculators

A335 P9

ASTM A335 -P9 Alloy Steel Pipe SMLS 9Cr-1Mo

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 1.13 Group 1.15 →

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