Yuhong Group Co.,Ltd
Zhejiang Yuhongwell Steel Co.,Ltd

Zhejiang Zhongwu Tube Manufacturing Co.,Ltd



About Us
Factory Tour
Quality Control
Contact Us
Company News
Home ProductsHeat Exchanger Tube

ASTM B163 No8825 DIN 2.4858 Seamless Incoloy 825 Tube

ASTM B163 No8825 DIN 2.4858 Seamless Incoloy 825 Tube

  • ASTM B163 No8825 DIN 2.4858 Seamless Incoloy 825 Tube
  • ASTM B163 No8825 DIN 2.4858 Seamless Incoloy 825 Tube
  • ASTM B163 No8825 DIN 2.4858 Seamless Incoloy 825 Tube
ASTM B163 No8825 DIN 2.4858 Seamless Incoloy 825 Tube
Product Details:
Place of Origin: CHINA
Brand Name: YUHONG
Certification: ABS, GL, DNV, NK, PED, AD2000, GOST9941-81, CCS, ISO 9001-2008
Model Number: ASTM B163 Incoloy 825 (NO8825) DIN 2.4858
Payment & Shipping Terms:
Minimum Order Quantity: 100KGS
Packaging Details: Ply-wooden Case /Iron Case/ Bundle with plastic Cap
Delivery Time: 7 DAYS
Payment Terms: L/C,T/T
Contact Now
Detailed Product Description
Standard: ASTM B163 Incoloy 825 (NO8825) DIN 2.4858 O.D.: 3MM TO 530MM
Length: MAX 50M Type: Seamless
Application: Boiler, Heat Exchanger, Etc.
High Light:

no8825 heat exchanger tube


astm b163 incoloy 825 tube


din 2.4858 incoloy 825 tube




Designated as UNS N08825 or DIN W.Nr. 2.4858, Incoloy 825 (also known as “Alloy 825”) is an iron-nickel-chromium alloy with additions of molybdenum, cooper and titanium. The molybdenum addition improves its resistance to pitting corrosion in aqueous corrosion application while copper content bestows resistance to sulfuric acid. Titanium is added for stabilization. The Alloy 825 has excellent resistance to both reducing and oxidizing acids, to stress-corrosion cracking, and to localized attack such as pitting and crevice corrosion. It is especially resistant to sulfuric and phosphoric acids. Incoloy 825 alloy is mainly used for chemical processing, petrochemical piping, pollution-control equipment, oil and gas well piping, nuclear fuel reprocessing, acid production, and pickling equipment.



Corrosion Resistance

The outstanding property of Incoloy 825 is its corrosion resistance. In reducing & oxidising conditions, Incoloy 825 resists general corrosion, pitting & crevice corrosion, intergranular corrosion and stress corrosion cracking. It is particularly useful in sulphuric & phosphoric acids, sulphur containing flue gases, sour gas and oil wells and sea water.




Incoloy 825 can be readily hot or cold worked. Hot working should be in the range 870 – 1180°C, finishing at 870 – 980°C. For maximum corrosion resistance hot worked parts should be stabilise annealed before use. The alloy is easier to cold form than stainless steels.



Heat Treatment
Incoloy 825 is stabilise annealed at 940°C. The softest structure is obtained at 980°C. Sections heavier than sheet, strip and wire should be quenched to avoid sensitisation.



Chemical Composition of Incoloy Alloy 825

Chemical composition of Incoloy Alloy 825 (ASTM B163 – Heat exchanger tube)

Element % Element %
Nickel 38.0 – 46.0 Carbon 0.05 max
Chromium 19.5 – 23.5 Manganese 1.0 max
Molybdenum 2.5 – 3.5 Sulfur 0.03 max
Copper 1.5 – 3.0 Silicon 0.5 max
Titanium 0.6 – 1.2 Aluminium 0.2 max
Iron 22.0 min (~33%)    

Tensile Properties of Incoloy Alloy 825

Typical room temperature tensile properties (not for design. Consult the relevant material or product specification for design values)

Form Condition 0.2% Proof Stress
Tensile Strength
Tube Annealed 440 770 35
Tube Cold drawn 880 1000 15
Bar Annealed 325 690 45
Plate Annealed 340 660 45
Sheet Annealed 420 760 39


ASTM Product Specifications

ASTM specifications for Incoloy Alloy 825.

Specification Title
B163 Seamless Nickel and Nickel Alloy Condenser and Heat-Exchanger Tubes
B423 Nickel-Iron-Chromium-Molybdenum-Copper Alloy (UNS N08825 and N08221)* Seamless Pipe and Tube
B424 Ni-Fe-Cr-Mo-Cu Alloy (UNS N08825 and UNS N08221)* Plate, Sheet, and Strip
B425 Ni-Fe-Cr-Mo-Cu Alloy (UNS N08825)
B704 Welded UNS N06625 and UNS N08825 Alloy Tubes
B705 Nickel-Alloy (UNS N06625 and N08825) Welded Pipe
B751 General Requirements for Nickel and Nickel Alloy Welded Tube
Equivalent Grade Designations

Other international grades that are equivalent to Incoloy Alloy 825.

Country Body Designation
USA UNS N08825
France AFNOR NC 21 FeDU
Germany DIN NiCr21Mo
Germany Werkstoff Nr 2.4858

Applications of Incoloy 825

1. Sulphuric acid piping and vessels

2. Phosphoric acid evaporators

3. Pickling tank heaters, pickling tanks and equipment

4. Chemical process equipment

5. Propellor shafts

6. Tank trucks

7. Calorifiers

8. Electrostatic precipitator electrodes

9. Hot vessels for food, water and seawater,

10. Ammonium sulphate vessels

11. Expansion bellows

12. Marine exhaust systems

12. Power station ash hoppers

ASTM B163 No8825 DIN 2.4858 Seamless Incoloy 825 Tube 0


Contact Details
Yuhong Group Co.,Ltd

Contact Person: Ms Vivi

Tel: 0086-13023766106

Send your inquiry directly to us (0 / 3000)