Group 3.8: Ni-Cr-Mo Alloys

ASME B16.5-2020 Pressure-Temperature Ratings

Pressure Ratings > Flange > Group 3.8 — Ni-Cr-Mo Alloys

Units

Group 3.8: Ni-Cr-Mo Alloys

Materials: B462 N10276, B564 N06625, B564 N08825, B462 N06022

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 3.8 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	700	930	1,395	2,095	3,490	5,820
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	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	—	325	430	645	965	1,610	2,685
1150	—	275	365	550	825	1,370	2,285
1200	—	205	275	410	615	1,030	1,715
1250	—	165	220	330	495	825	1,370
1300	—	120	160	240	360	600	1,000

Matching Pipe Materials — MAWP Calculators

B622 N10276

ASTM B622 N10276 (C276) Pipe SMLS 54Ni-16Mo-15Cr, Sol. Ann.

B444 N06625

ASTM B444 Gr-1, N06625 (625) Pipe SMLS, 60Ni-22Cr-9Mo-3.5Cb, annealed

B423 N08825

ASTM B423 N08825 (825) Pipe SMLS, 42Ni-21.5Cr-3Mo-2.3Cu, C.D. ann

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 3.7

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