Group 1.4: Alloy Steel C-Mn-Si

ASME B16.5-2020 Pressure-Temperature Ratings

Pressure Ratings > Flange > Group 1.4 — Alloy Steel C-Mn-Si

Units

Group 1.4: Alloy Steel C-Mn-Si

Materials: A350 LF1 Cl.1, A515-60, A516-60

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 1.4 Pressure-Temperature Ratings (psig)

Temp (°F)	Class 150	Class 300	Class 400	Class 600	Class 900	Class 1500	Class 2500
−20	235	615	825	1,235	1,850	3,085	5,145
100	235	615	825	1,235	1,850	3,085	5,145
200	215	565	755	1,130	1,695	2,830	4,715
300	210	545	725	1,090	1,635	2,725	4,545
400	200	525	700	1,055	1,580	2,635	4,390
500	170	500	670	1,005	1,505	2,510	4,185
600	140	475	630	945	1,420	2,365	3,945
650	125	455	610	915	1,370	2,285	3,805
700	110	440	590	885	1,325	2,210	3,685
750	95	430	570	855	1,285	2,140	3,565
800	80	370	495	740	1,110	1,850	3,085
850	65	300	400	595	895	1,490	2,485
900	50	170	230	345	515	855	1,430
950	35	135	185	275	410	685	1,145
1000	20	85	115	170	255	430	715

Matching Pipe Materials — MAWP Calculators

No seamless pipe MAWP data available for this flange group.

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 1.3 Group 1.5 →

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