Incoloy 825 reducers are fittings used to connect two pipes of different diameters in a piping system. They are manufactured from the nickel alloy Incoloy 825 through hot forming or cold forming processes and feature beveled ends for butt welding. Incoloy 825 reducers conform to ASME B16.9 dimensional standards.

Incoloy 825 exhibits excellent corrosion resistance to a variety of corrosive media, particularly in oxidizing and reducing environments. Therefore, Incoloy 825 butt welded reducers are specified for critical applications in harsh conditions in industries such as chemical, oil and gas, pharmaceutical, and power generation.
Incoloy 825 Pipe Reducers Specification
Incoloy 825 pipe reducers are buttweld fittings for connecting pipes of different diameters in corrosive and high-temperature piping systems. Below is a detailed specification sheet covering their key standards, dimensions, materials, and applications.
|
Specification Category |
Details |
|
Material Standard |
ASTM B366 / ASME SB366 |
|
Dimensional Standard |
ASME/ANSI B16.9, ASME B16.25, MSS-SP-43 |
|
Available Sizes |
Seamless: 1/2" to 10" or 24"; Welded/Fabricated: 1/2" to 48" |
|
Wall Thickness (Schedule) |
SCH 5S, 10S, 10, 20, 40, STD, 80, XS, 160, XXS, etc. |
|
Types |
Concentric Reducer, Eccentric Reducer |

|
Nominal Pipe Size (NPS) |
DN |
Outside Diameter at Bevel |
End-to-End, H |
Nominal Pipe Size (NPS) |
DN |
Outside Diameter at Bevel |
End-to-End, H |
||
|
Large End |
Small End |
Large End |
Small End |
||||||
|
3/4 x 1/2 |
20 ×15 |
26.7 |
21.3 |
38 |
5 × 4 |
125 ×100 |
141.3 |
114.3 |
127 |
|
3/4 x 3/8 |
20 ×10 |
26.7 |
17.3 |
38 |
5 × 3 1/2 |
125 ×90 |
141.3 |
101.6 |
127 |
|
1 × 3/4 |
25 ×20 |
33.4 |
26.7 |
51 |
5 × 3 |
125 ×80 |
141.3 |
88.9 |
127 |
|
1 × 1/2 |
25 ×15 |
33.4 |
21.3 |
51 |
5 × 2 1/2 |
125 ×65 |
141.3 |
73.0 |
127 |
|
1 1/4 × 1 |
32 ×25 |
42.2 |
33.4 |
51 |
5 × 2 |
125 × 50 |
141.3 |
60.3 |
127 |
|
1 1/4 ×3/4 |
32 ×20 |
42.2 |
26.7 |
51 |
6 × 5 |
150 ×125 |
168.3 |
141.3 |
140 |
|
1 1/4 x 1/2 |
32 ×15 |
42.2 |
21.3 |
51 |
6 × 4 |
150 ×100 |
168.3 |
114.3 |
140 |
|
1 1/2 x 1 1/4 |
40 ×32 |
48.3 |
42.2 |
64 |
6 × 3 1/2 |
150 ×90 |
168.3 |
101.6 |
140 |
|
1 1/2 × 1 |
40 ×25 |
48.3 |
33.4 |
64 |
6 × 3 |
150 ×80 |
168.3 |
88.9 |
140 |
|
1 1/2 x 3/4 |
40 ×20 |
48.3 |
26.7 |
64 |
6 × 2 1/2 |
150 ×65 |
168.3 |
73.0 |
140 |
|
1 1/2 x 1/2 |
40 ×15 |
48.3 |
21.3 |
64 |
8 × 6 |
200 ×150 |
219.1 |
168.3 |
152 |
|
2 ×1 1/2 |
50 ×40 |
60.3 |
48.3 |
76 |
8 × 5 |
200 ×125 |
219.1 |
141.3 |
152 |
|
2 ×1 1/4 |
50 ×32 |
60.3 |
42.2 |
76 |
8 × 4 |
200 ×100 |
219.1 |
114.3 |
152 |
|
2 × 1 |
50 ×25 |
60.3 |
33.4 |
76 |
8 × 3 1/2 |
200 ×90 |
219.1 |
101.6 |
152 |
|
2 ×3/4 |
50 ×20 |
60.3 |
26.7 |
76 |
10 × 8 |
250 ×200 |
273.0 |
219.1 |
178 |
|
2 1/2 × 2 |
65 ×50 |
73.0 |
60.3 |
89 |
10 × 6 |
250 ×150 |
273.0 |
168.3 |
178 |
|
2 1/2 x 1 1/2 |
65 ×40 |
73.0 |
48.3 |
89 |
10 × 5 |
250 x 125 |
273.0 |
141.3 |
178 |
|
2 1/2 x 1 1/4 |
65 ×32 |
73.0 |
42.2 |
89 |
10 × 4 |
250 ×100 |
273.0 |
114.3 |
178 |
|
2 1/2 × 1 |
65 ×25 |
73.0 |
33.4 |
89 |
12 × 10 |
300 ×250 |
323.8 |
273.0 |
203 |
|
3 ×2 1/2 |
80 ×65 |
88.9 |
73.0 |
89 |
12 × 8 |
300 ×200 |
323.8 |
219.1 |
203 |
|
3 × 2 |
80 ×50 |
88.9 |
60.3 |
89 |
12 × 6 |
300 ×150 |
323.8 |
168.3 |
203 |
|
3 × 1 1/2 |
80 ×40 |
88.9 |
48.3 |
89 |
12 × 5 |
300 ×125 |
323.8 |
141.3 |
203 |
|
3 × 1 1/4 |
80 ×32 |
88.9 |
42.2 |
89 |
14 × 12 |
350 ×300 |
355.6 |
323.8 |
330 |
|
3 1/2 × 3 |
90 ×80 |
101.6 |
88.9 |
102 |
14 × 10 |
350 ×250 |
355.6 |
273.0 |
330 |
|
3 1/2 x 2 1/2 |
90 ×65 |
101.6 |
73.0 |
102 |
14 × 8 |
350 ×200 |
355.6 |
219.1 |
330 |
|
3 1/2 × 2 |
90 ×50 |
101.6 |
60.3 |
102 |
14 × 6 |
350 ×150 |
355.6 |
168.3 |
330 |
|
3 1/2 × 1 1/2 |
90 ×40 |
101.6 |
48.3 |
102 |
16 × 14 |
400 ×350 |
406.4 |
355.6 |
356 |
|
3 1/2 x 2 1/4 |
90 ×32 |
101.6 |
42.2 |
102 |
16 × 12 |
400 ×300 |
406.4 |
323.8 |
356 |
|
4 × 3 1/2 |
100 ×90 |
114.3 |
101.6 |
102 |
16 × 10 |
400 ×250 |
406.4 |
273.0 |
356 |
|
4 × 3 |
100 ×80 |
114.3 |
88.9 |
102 |
16 × 8 |
400 ×200 |
406.4 |
219.1 |
356 |
|
4 × 2 1/2 |
100 ×65 |
114.3 |
73.0 |
102 |
18 × 16 |
450 ×400 |
457 |
406.4 |
381 |
|
4 × 2 |
100 ×50 |
114.3 |
60.3 |
102 |
18 × 14 |
450 ×350 |
457 |
355.6 |
381 |
|
4 ×1 1/2 |
100 ×40 |
114.3 |
48.3 |
102 |
18 × 12 18 × 10 |
450 ×300 450 ×250 |
457 457 |
323.8 273.0 |
381 381 |
|
20 × 18 |
500 × 450 |
508 |
457 |
508 |
36 × 34 |
900 × 850 |
914 |
864 |
610 |
|
20 × 16 |
500 × 400 |
508 |
406.4 |
508 |
36 × 32 |
900 × 800 |
914 |
813 |
610 |
|
20 × 14 |
500 × 350 |
508 |
355.6 |
508 |
36 × 30 |
900 × 750 |
914 |
762 |
610 |
|
20 × 12 |
500 × 300 |
508 |
323.8 |
508 |
36 × 28 36 × 26 |
900 × 700 900 × 650 |
914 914 |
660 610 |
610 610 |
|
22 × 20 |
550 × 500 |
559 |
508 |
508 |
|||||
|
22 × 18 |
550 × 450 |
559 |
457 |
508 |
38 × 36 |
950 × 900 |
965 |
914 |
610 |
|
22 × 16 |
550 × 400 |
559 |
406.4 |
508 |
38 × 34 |
950 × 850 |
965 |
864 |
610 |
|
22 × 14 |
550 × 350 |
559 |
355.4 |
508 |
38 × 32 |
950 × 800 |
965 |
813 |
610 |
|
24 × 22 |
600 × 550 |
610 |
559 |
508 |
38 × 30 |
950 × 750 |
965 |
762 |
610 |
|
24 × 20 |
600 × 500 |
610 |
508 |
508 |
38 × 28 |
950 × 700 |
965 |
711 |
610 |
|
24 × 18 |
600 × 450 |
610 |
457 |
508 |
38 × 26 |
950 × 650 |
965 |
660 |
610 |
|
24 × 16 |
600 × 400 |
610 |
406.4 |
508 |
40 × 38 |
1000 × 950 |
1016 |
965 |
610 |
|
26 × 24 |
650 × 600 |
660 |
610 |
610 |
40 × 34 |
1000 × 850 |
1016 |
864 |
610 |
|
26 × 22 |
650 × 550 |
660 |
559 |
610 |
40 × 32 |
1000 × 800 |
1016 |
813 |
610 |
|
26 × 20 |
650 × 500 |
660 |
508 |
610 |
40 × 30 |
1000 × 750 |
1016 |
762 |
610 |
|
26 × 18 |
650 × 450 |
660 |
457 |
610 |
40 × 36 |
1000 × 900 |
1016 |
914 |
610 |
|
28 × 26 |
700 × 650 |
711 |
660 |
610 |
42 × 40 42 × 38 |
1050 × 1000 1050 × 950 |
1067 1067 |
1016 965 |
610 610 |
|
28 × 24 |
700 × 600 |
711 |
610 |
610 |
42 × 36 |
1050 × 900 |
1067 |
914 |
610 |
|
28 × 22 |
700 × 550 |
711 |
508 |
610 |
42 × 34 |
1050 × 850 |
1067 |
864 |
610 |
|
28 × 20 |
700 × 500 |
711 |
457 |
610 |
42 × 32 |
1050 × 800 |
1067 |
813 |
610 |
|
30 × 28 |
750 × 700 |
762 |
711 |
610 |
42 × 30 |
1050 × 750 |
1067 |
762 |
610 |
|
30 × 26 |
750 × 650 |
762 |
660 |
610 |
44 × 42 |
1100 × 1050 |
1118 |
1067 |
610 |
|
30 × 24 |
750 × 600 |
762 |
610 |
610 |
44 × 40 |
1100 × 1000 |
1118 |
1016 |
610 |
|
30 × 22 |
750 × 550 |
762 |
508 |
610 |
44 × 38 |
1100 × 950 |
1118 |
965 |
610 |
|
32 × 30 |
800 × 750 |
813 |
762 |
610 |
44 × 36 |
1100 × 900 |
1118 |
914 |
610 |
|
32 × 28 |
800 × 700 |
813 |
711 |
610 |
46 × 44 |
1150 × 1100 |
1168 |
1118 |
711 |
|
32 × 26 |
800 × 650 |
813 |
660 |
610 |
46 × 42 |
1150 × 1050 |
1168 |
1067 |
711 |
|
32 × 24 |
800 × 600 |
813 |
610 |
610 |
46 × 40 |
1150 × 1000 |
1168 |
1016 |
711 |
|
34 × 32 |
850 × 800 |
864 |
813 |
610 |
46 × 38 |
1150 × 950 |
1168 |
965 |
711 |
|
34 × 30 |
850 × 750 |
864 |
762 |
610 |
48 × 46 |
1200 × 1150 |
1219 |
1168 |
711 |
|
34 × 28 |
850 × 700 |
864 |
660 |
610 |
48 × 44 |
1200 × 1100 |
1219 |
1118 |
711 |
|
34 × 26 |
850 × 650 |
864 |
610 |
610 |
48 × 42 48 × 40 |
1200 × 1050 1200 × 1000 |
1219 1219 |
1067 1016 |
711 711 |
Incoloy 825 Butt Weld Reducers Types
Incoloy Alloy 825 butt-welded reducing fittings are mainly divided into two basic types: concentric reducers and eccentric reducers. They are all manufactured according to ASME B16.9 standards and conform to ASTM B366/SB366 material specifications.
Incoloy 825 Concentric Reducers

Alloy 825 concentric reducers enable vertical diameter changes in piping systems. Their symmetrical tapered structure ensures a smooth transition for fluid flow, effectively reducing turbulence and pressure drop. This design guarantees fluid direction stability and does not interfere with flow direction, making it widely used in applications requiring uniform flow.
Incoloy 825 Eccentric Reducers

Alloy 825 eccentric reducers are specifically for horizontal piping, addressing specific problems through unique "top flush" or "bottom flush" offset structures. "Top flush" reducers are typically installed at the pump suction end, effectively preventing air accumulation at the top of the pipe and thus avoiding cavitation damage to the pump.
"Bottom flush" reducers ensure a continuous slope at the bottom of the pipe, facilitating complete fluid discharge and preventing liquid buildup in the pipe. This is particularly important for systems requiring regular cleaning or transporting fluids prone to sediment buildup.
China JN Incoloy 825 Reducer Manufacturer
We, Jinie, are a leading Chinese manufacturer of Incoloy 825 reducers, committed to meeting diverse customer needs and providing the highest quality products.
We use premium raw materials and mass-produce to ensure both product quality and quantity meet standards. We always prioritize quality.
JN is dedicated to providing customers with the highest quality Incoloy 825 reducers and related services. Before shipment, we carefully package the reducers to ensure safe and undamaged delivery worldwide.
We can provide solutions for various industrial applications upon request. Our company supplies a large quantity of high-quality Incoloy 825 reducers globally, offering numerous advantages.
