Group 3.1: Alloy 20 (35Ni-35Fe-20Cr-Cb)

ASME B16.5-2020 Pressure-Temperature Ratings

Pressure Ratings > Flange > Group 3.1 — Alloy 20 (35Ni-35Fe-20Cr-Cb)

Units

Group 3.1: Alloy 20 (35Ni-35Fe-20Cr-Cb)

Materials: A182/B462 N08020, A240/B463 N08020

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 3.1 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	740	990	1,485	2,225	3,710	6,180
300	230	710	945	1,420	2,130	3,550	5,920
400	200	680	910	1,365	2,045	3,410	5,680
500	170	655	875	1,310	1,965	3,275	5,460
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

Matching Pipe Materials — MAWP Calculators

B729 N08020

ASTM B729 N08020 (020) Pipe or Tube SMLS, 35Ni-35Fe-20Cr-Cb, annealed

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.

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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