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Pressure-Temperature Ratings for Inconel Alloy 625 Flanges

Inconel alloy 625 flanges manufactured to ASME B16.5 fall into the Group 3.8 materials of the standard specification. They can be supplied in 7 classes: 150, 300, 400, 600, 900, 1500, 2500. Flanges with hub, such as weld neck, slip on, threaded, socket weld, and LWN, are made in accordance with ASTM B564 Gr.N06625; flanges without hub, such as blind or flat, can be either made from ASTM B564 Gr.N06625 forgings or ASTM B443 Gr.N06625 plates.

The Inconel alloy 625 flange shall always be furnished in annealed condition. Since alloy 625 in the annealed condition is subject to severe loss of impact strength at room temperatures after exposure in the range of 538°C to 760°C, it shall not be used over 645°C. The typical pressure-temperature ratings for Inconel alloy 625 pipe flanges are listed in below tables.

Pressure-Temperature Rating for Alloy 625 flanges Class 150 & 300

Temp.Working Pressures by Classes
Class 150Class 300
-29 to 3820.051.7
5019.551.7
10017.751.5
15015.850.3
20013.848.3
25012.146.3
30010.242.9
3259.341.4
3508.440.3
3757.438.9
4006.536.5
4255.535.2
4504.633.7
4753.731.7
5002.828.2
5381.425.2
550. . . 25.0
575. . . 24.0
600. . . 21.6
625. . . 18.3
650. . . 14.1
675. . . 11.5
700. . . 8.8
*Temp.: °C; Working pressure: bar.

Pressure-Temperature Rating for Alloy 625 flanges Class 600 & 900

Temp.Working Pressures by Classes
Class 600Class 900
-29 to 38103.4155.1
50103.4155.1
100103.0154.6
150100.3150.6
20096.7145.0
25092.7139.0
30085.7128.6
32582.6124.0
35080.4120.7
37577.6116.5
40073.3109.8
42570.0105.1
45067.7101.4
47563.495.1
50056.584.7
53850.075.2
55049.874.8
57547.971.8
60042.964.2
62536.654.9
65028.142.2
67523.034.6
70017.526.3
*Temp.:℃; Working pressure: bar.

Pressure-Temperature Rating for Alloy 625 flanges Class 1500 & 2500

Temp.Working Pressures by Classes
Class 1500Class 2500
-29 to 38258.6430.9
50258.6430.9
100257.6429.4
150250.8418.2
200241.7402.8
250231.8386.2
300214.4357.1
325206.6344.3
350201.1335.3
375194.1323.2
400183.1304.9
425175.1291.6
450169.0281.8
475158.2263.9
500140.9235.0
538125.5208.9
550124.9208.0
575119.7199.5
600107.0178.5
62591.2152.0
65070.4117.3
67557.696.0
70043.873.0
*Temp.℃; Working pressure: bar.

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