Nickel and Nickel Alloy Tubes
ASTM B423 UNS N08825 (Incoloy 825)
Standard ASTM B423
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ASTM B423 Standard Specification for Nickel-Iron-Chromium-Molybdenum-Copper Alloy (UNS N08825 and N08221)* Seamless Pipe and Tube
Standard: ASTM B423
Material: UNS N08825
Equivalent Material: 2.4858, Incoloy 825, 0Cr21Ni42Mo3Cu2Ti
Chemistry Composition
Ni, %
Cu, %
Mo, %
Fe, %
Mn, %
C, %
Si, %
S, %
Cr, %
Al, %
Ti, %
38.0-46.0
1.50-3.00
2.50-3.50
22.0 min
1.00 max
0.05 max
0.50 max
0.03% max
19.5-23.5
0.20 max
0.60-1.20
Mechanical Properties
Tensile Strength , MPa
Yield Strength, MPa
Elongation, %
586 min
241 min
30 min
Outside Diameter & Tolerance
Outside Diameter, mm 
Tolerance, mm 
Seamless Cold-Worked
10≤OD＜16
±0.13
16＜OD≤38
±0.19
38＜OD≤76
±0.25
76＜OD≤114
±0.38
114＜OD≤152
±0.51
152＜OD≤168
±0.64
168＜OD≤219
±0.79
219＜OD≤356
+1.57/-0.79
356＜OD≤610
+3.18/-0.79
Hot-Finished
19≤OD≤38.1
+0.40/-0.80
38.1＜OD≤102
±0.80
102＜OD≤235
+1.60/-0.80
Seamless Hot-Worked
25≤OD≤48
+0.40/-0.79
48＜OD≤114
±0.79
114＜OD≤165
±1.20
165＜OD≤235
±1.60
Wall thickness & Tolerance
Outside Diameter, mm 
Tolerance, %
Average Wall
Minimum Wall
Seamless Cold-Worked
10≤OD＜16
±15.0
+30.0/-0
16＜OD≤38
±10.0
+22.0/-0
38＜OD≤76
±10.0
+22.0/-0
76＜OD≤114
±10.0
+22.0/-0
114＜OD≤152
±12.5
+28.0/-0
152＜OD≤168
±12.5
+28.0/-0
168＜OD≤219
±12.5
+28.0/-0
219＜OD≤356
+15.0/-12.5
+30.0/-0
356＜OD≤610
+15.0/-12.5
+30.0/-0
Hot-Finished
19≤OD≤38.1
±12.5
+28.5/-0
38.1＜OD≤102
±12.5
+28.5/-0
102＜OD≤235
±12.5
+28.5/-0
Seamless Hot-Worked
25≤OD≤48
+16.0/-12.5
+28.5/-0
48＜OD≤114
+16.0/-12.5
+28.5/-0
114＜OD≤165
+16.0/-12.5
+28.5/-0
165＜OD≤235
+16.0/-12.5
+28.5/-0
Length: 5800mm; 6000mm; 6096mm; 7315mm; 11800mm; 12000mm; and so on.
Max developed length: 32 meters, also U bending can be offered, each leg length can be 15.24 meters.
Keyword: ASTM B423, Nickel-Iron-Chromium-Molybdenum-Copper Alloy Tube, N08221, N08825, Seamless Pipe, Seamless Tube
More information about Incoloy 825
Incoloy 825, also named as Alloy 825 or Inconel 825 is a nickel-iron-chromium alloy with additions of molybdenum, copper and titanium. This nickel steel alloy’s chemical composition is designed to provide exceptional resistance to many corrosive environments. It is similar to alloy 800 but has improved resistance to aqueous corrosion. It has excellent resistance to both reducing and oxidizing acids, to stress-corrosion cracking, and to localized attack such as pitting and crevice corrosion. Alloy 825 is especially resistant to sulfuric and phosphoric acids. This nickel steel alloy is used for chemical processing, pollution-control equipment, oil and gas well piping, nuclear fuel reprocessing, acid production, and pickling equipment.

The characteristics of Incoloy 825

- Excellent resistance to reducing and oxidizing acids
- Good resistance to stress-corrosion cracking
- Satisfactory resistance to localized attack like pitting and crevice corrosion
- Very resistant to sulfuric and phosphoric acids
- Good mechanical properties at both room and elevated temperatures up to approximately 1000°F
- Permission for pressure-vessel use at wall temperatures up to 800°F

Corrosion Resistance of Incoloy 825

Incoloy 825 has a high level of corrosion resistance. It resists general corrosion, pitting, crevice corrosion, intergranular corrosion, and stress-corrosion cracking in both reducing and oxidizing environments.

The applications of Incoloy 825

- Chemical Processing
- Pollution-control
- Oil and gas well piping
- Nuclear fuel reprocessing
- Components in Pickling equipment like heating coils, tanks, baskets and chains
- Acid production
 
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