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Pressure-Temperature Ratings for Hastelloy C-276 Flanges

Designated with nominal composition 54Ni-16Mo-15Cr, Hastelloy C-276 flanges of ASME B16.5 can be manufactured from ASTM B462 Gr. N10276 forgings or ASTM B575 Gr. N10276 plates. It shall be solution annealed and not to be used over 675°C[1250°F]. The pressure-temperature ratings for Hastelloy C-276 flanges are listed in below two tables.

1. Pressure-Temperature Ratings for Hastelloy C-276 Flanges: Metric Unit

Temp. °CClass 150Class 300Class 400Class 600Class 900Class 1500Class 2500
−29~3820.051.768.9103.4155.1258.6430.9
5019.551.768.9103.4155.1258.6430.9
10017.751.568.7103.0154.6257.6429.4
15015.850.366.8100.3150.6250.8418.2
20013.848.364.596.7145.0241.7402.8
25012.146.361.792.7139.0231.8386.2
30010.242.957.085.7128.6214.4357.1
3259.341.455.082.6124.0206.6344.3
3508.440.353.680.4120.7201.1335.3
3757.438.951.677.6116.5194.1323.2
4006.536.548.973.3109.8183.1304.9
4255.535.246.570.0105.1175.1291.6
4504.633.745.167.7101.4169.0281.8
4753.731.742.363.495.1158.2263.9
5002.828.237.656.584.7140.9235.0
5381.425.233.450.075.2125.5208.9
550-25.033.349.874.8124.9208.0
575-24.031.947.971.8119.7199.5
600-21.628.642.964.2107.0178.5
625-18.324.336.654.991.2152.0
650-14.118.828.142.270.4117.3
675-11.515.423.034.657.696.0
*Working pressures by Classes, unit: bar.

2. Pressure-Temperature Ratings for Hastelloy C-276 Flanges: US Customary Unit

Temp. °FClass 150Class 300Class 400Class 600Class 900Class 1500Class 2500
-20~10029075010001500225037506250
20026075010001500225037506250
3002307309701455218536406070
4002007009301395209534905820
5001706658851330199533255540
6001456058051210181530255040
6501255907851175176529404905
7001105707551135170528404730
750955307101065159526604430
800805106751015152525404230
85065485650975146024354060
90050450600900135022453745
95035385515775116019303220
100020365485725109018203030
1050-360480720108018003000
1100-32543064596516102685
1150-27536555082513702285
1200-20527541061510301715
1250-1652203304958251370
*Working pressures by Classes, unit: psig.

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