Inconel 825 Pipes and Tubes

Inconel 825 pipes and tubes are manufactured with Incoloy 825 (UNS N08825) which is a part of austenitic grade with the content like iron, chromium, and nickel and minor addition of molybdenum, titanium, and copper. Inconel 825 pipe and tubes are developed to provide up to the mark resistance to various corrosive media even in oxidizing and reducing environments.

Inconel 825 pipe and tubes with their nickel content are resistant to chloride stress corrosion cracking. The amalgamation of molybdenum and copper gives improved corrosion resistance in reducing environments as compared to its standard grade.

Specifications

Inconel 825  Seamless Pipe  :  ASTM/ASME B 423 / SB 423

Inconel 825 Seamless tube  :  ASTM/ASME B 423 / SB 423

Inconel 825 ERW Pipe          :  ASTM/ASME B 705/ SB 705

Inconel 825 ERW Tube         :  ASTM/ASME B 704/ SB 704

Chemical Properties

GRADE CrCuMoCoAlTiCFeMnSiPSNi
INCONEL 825MIN %19.51.52.50.62238
MAX %23.533.510.21.20.0510.50.0150.0346

Production Process

Inconel 825 or UNS N08825 are manufactured such as ERW ( Electric Resistance Welded), Seamless and EFW ( Electric Fusion Welding) Pipes and Tubes with different forms such as round, square, rectangle, etc. with particular ends like the plain end, bevel end, and threaded end with normal thickness of different schedule which range from SCH 5 to SCH XXS..

Specifications

GRADEUNSDINAFNOR
INCONEL 825NO88252.4858NC 21 FeDU

The process through which Inconel 825 pipes and tubes can be manufactured with various processes like cold pilgering process, extrusion process, tube mill process, and piercing process which need to be followed by heat treatment and mechanical testing.

Fabrication and Heat Treatment

The hot working temperature range for Inconel 825 tube and pipes is 1600°F to 2150°F (870°C to 1180°C). For optimal corrosion resistance, last hot working should be done at temperatures between 1600°F and 1800°F (870°C and 980°C). Hot working should be followed by air cool or faster.

Inconel 825 products like pipes and tubes are heat treated during the manufacturing process to form the optimal combination of stabilization, corrosion resistance, mechanical properties, and formability. To maintain these properties during fabrication, annealing should be done in between 1700°F to 1800°F (930°C to 980°C) and rapid air cooling or water quenching is necessary after the process.

Properties

The machining of Inconel 825 is moderately simple. All the regular techniques can be promptly used. Inconel 825 tubes and pipes have ideal machining attributes in tempered condition. The grade Inconel 825 comes with lesser operating hardness due to its copper content material. It can therefore be applied at cryogenic temperatures to extreme temperatures without a lack of mechanical properties.

Mechanical Properties

GradeTensile Strength (MPa)Yield Strength 0.2% Proof (MPa) minElongation (% in 50mm) min
825550 MPa220 MPa30

Inconel Alloy 825 is easily weldable by regular processes such as [GMAW (MIG), GTAW (TIG), SMAW (manual), SAW] while welding the joint must be clean to eliminate contamination of the weld pool.

Physical Properties

GradeDensity (g/cm3)Elastic Modulus (GPa)Mean Co-eff of Thermal Expansion (μm/m/°C)Thermal Conductivity (W/m.K)Specific Heat (J/Kg.K)Electrical Resistivity (μΩ.m)
Inconel 825  27-204°C0-315°Cat 93°Cat 204°C0-100°C 
7.8219014.914.212.314.14401.13

Application

Inconel 825 pipe and tubes are popularly used in ammonium chloride & phosphoric acid solution. Extreme heat exchangers with working conditions for refrigerant purpose alloy 825 is the best option. Inconel 825 tube suited pipelines of marine applications & offshore equipment are of material Incoloy 825.

  • Condensers in heat exchangers
  • Oil and gas well equipment on the seashore
  • Hydraulic systems
  • Chemical injection lines
  • Chemical process equipment and vessels
  • Downhole control lines
  • Control and instrumentation
  • Acid Production
  • Nuclear fuel processing.

NOTE: Inconel 825 Pipes and Tubes is a registered trademark of  Special Metals Corporation.

Hastelloy B3 Flat

B-3 Alloy flat is an additional member of the nickel-molybdenum family of alloys with thermal stability greater than that of Hastelloy B-2. It has excellent resistance to pitting, corrosion, and stress corrosion cracking. It has excellent resistance to hydrochloric acid at all concentrations and temperatures. 

Chemical Composition

GRADE

 

Ni

Mo

Co

W

Mn

Cr

Al

Si

Ti

Nb

V

Ta

Zr

Alloy B-3

Min

27

 

1

0.1

Max

65

32

3

3

3

3

0.05

0.1

0.2

0.2

0.2

0.02

0.01

Alloy B3, in common with most nickel alloys, offers excellent corrosion resistance.  Alloy B3 flat is particularly useful in chemical processes involving highly corrosive acids at temperatures that would normally produce rapid and catastrophic corrosion.

Properties

The main functionality of Hastelloy B-3 alloys flat is to survive under high-stress, high-temperature applications; the chief benefit of Hastelloy B-3 is its ability to resist hydrochloric acid at all temperatures and concentrations. This alloy also resists other vigorously corrosive agents extremely well. 

Mechanical Properties

Grade

Tensile Strength

Yield Strength

Elongation

Hardness, MAX

[MPA]

[MPA]

(% in 50mm) min

HRB

Alloy B-3

760

350

40

100

The improved thermal stability of B-3 alloy flat minimizes the problems associated with fabrication of B-2 alloy components.  Hastelloy B-3 has good overall forming and welding characteristics.  A low carbon content permits alloy B-3 to be used in the as-welded condition.

Physical Properties

Grade

Density (g/cm3)

Elastic Modulus (GPa)

Coeff of Thermal Expansion (μm/m/°C)

Thermal Conductivity (W/m.K)

Electrical Resistivity (Ωμ.m)

Elastic Modulus (GPa)

Specific Heat (J/Kg.K)

Melting Range

0-100°C

0-100°C

at 100°C

Alloy B-3

9.22

220

10.6

12.1

1.37

216

382

1418°C

Specification

The Hastelloy B-3 alloy  flat or UNS N10675 specified by ASTM standard as  ASTM B 333 or ASME SB-333 are readily available in different types such as, for example, Hastelloy B-3 Plane flat, Shim, Thin, Perforated, Polished, Diamond, Chequered, Hot rolled, Cold rolled, Annealed, Soft annealed , coils, clad flat, strip etc.

As per availability and requirement Alloy B3 flat can be manufactured in different types burt, also they also has different types of finishing on surface such as for example, Brushed ,Polished t, Mirror finish, Mirror polished, Hot rolled(HR), Cold rolled  (CR), 2B,2D, BA NO(8), SATIN(Met with Plastic coated).

Application

Alloy B-3 flat is widely used in the chemical processing industry and for storage of corrosive acids. The pressure vessels used for chloroprene production, along with nuclear reactors, chemical reactors and distillation equipment are manufactured in Hastelloy B3 alloy.

Shalco Industries is a manufacturing company of Flat in India and Global Supplier.

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