Inconel 625 Tube Specification

The specifications of Alloy 625 tube, including standards, forms, dimensions, finishes, and more, are provided in the table below.

Parameter Specification
Standard ASTM B444 / ASME SB444
Type Seamless & Welded Tubing
Manufacturing Process Grade 1: Annealed
Grade 2: Solution treated
Size Range 1/4" (6.35 mm) to 3" (76.2 mm) - seamless
up to 7" (177.8 mm) - welded
Wall Thickness 0.3 mm to 50 mm
Length Up to 13,500 mm or as required
Form Round Tubes / Pipes
Condition Grade 1 (Annealed), Grade 2 (Solution Annealed)

Inconel 625 Tube Sizes and Dimensions

Inconel 625 seamless tubes are stocked from 1/4" (6.35 mm) to 3" (76.2 mm) OD with walls from 0.020" to 0.375" (0.5 to 9.5 mm). Welded tubes go up to 7" (177.8 mm) OD. Standard lengths are 12 ft and 20 ft. The table below lists common stock sizes.

OD (inches) Wall Thickness (inches)
1/4" 0.028", 0.035", 0.065"
3/8" 0.035", 0.049", 0.065"
1/2" 0.065", 0.083"
3/4" 0.065"
1" 0.065", 0.083"
1-1/4" 0.109"

Contact us for non-standard Alloy 625 tube dimensions.

Inconel 625 Tube Price

Inconel 625 tube pricing is ₹2,000 and ₹4,000 per kg or $25 - $100+ USD per kg. Final price depends on OD, wall thickness, quantity, and form. Request a quote for current rates.

Inconel 625 Tube Chemical Composition

Inconel 625 tube per ASTM B444 has a nickel-chromium-molybdenum-niobium chemistry providing corrosion resistance and high-temperature stability. The table below lists the elemental breakdown per ASME SB-444. Chromium and molybdenum resist chloride-induced pitting. Niobium strengthens the matrix without precipitation hardening.

Nickel Ni
58.0% min
Chromium Cr
20.0 - 23.0%
Molybdenum Mo
8.0 - 10.0%
Niobium + Tantalum Nb+Ta
3.15 - 4.15%
Iron Fe
5.0% max
Carbon C
0.10% max
Manganese Mn
0.50% max
Silicon Si
0.50% max
Sulfur S
0.015% max
Aluminium Al
0.40% max
Titanium Ti
0.40% max

Inconel 625 Tube Mechanical Properties

ASTM B444 defines two grades of Inconel 625 tube, each with distinct mechanical minimums: Grade 1 (annealed) and Grade 2 (solution treated).

ASTM B444 Grade 1: Annealed

Grade 1 Inconel 625 tube is hot finished or cold worked, then annealed.

827 / 120
MPa (ksi)
Tensile Strength (min)
414 / 60
MPa (ksi)
Yield Strength 0.2% Offset (min)
30
%
Elongation in 2 in. or 4D (min)
Property Value Unit
Tensile Strength (min) 120 / 827 ksi / MPa
Yield Strength 0.2% Offset (min) 60 / 414 ksi / MPa
Elongation in 2 in. or 4D (min) 30 %

ASTM B444 Grade 2: Solution Treated

Grade 2 Alloy 625 tube receives a solution anneal at a higher temperature, optimising the microstructure for service above 1000 °F (538 °C).

690 / 100
MPa (ksi)
Tensile Strength (min)
276 / 40
MPa (ksi)
Yield Strength 0.2% Offset (min)
30
%
Elongation in 2 in. or 4D (min)
Property Value Unit
Tensile Strength (min) 100 / 690 ksi / MPa
Yield Strength 0.2% Offset (min) 40 / 276 ksi / MPa
Elongation in 2 in. or 4D (min) 30 %

Select Grade 1 when strength is the priority; choose Grade 2 for elevated-temperature corrosive service.

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Inconel 625 Tube Equivalent Grades

The equivalent designations of Inconel 625 tube, including UNS, Werkstoff Nr., JIS, and more, are listed in the table below.

Designation Equivalent
UNS N06625
Werkstoff Nr. 2.4856
JIS NCF 625
GOST ХН75МБТЮ
EN NiCr22Mo9Nb

Inconel 625 Tube Applications

Inconel 625 tubing serves industries that demand resistance to corrosion, oxidation, and high temperatures across 4 major application areas.

Oil and Gas

Alloy 625 tubing is used for subsea control lines and chemical injection systems in sour gas environments, offering excellent corrosion resistance.

Chemical Processing

UNS N06625 tubing handles hydrochloric, phosphoric, and mixed acid streams in reactors and heat exchangers.

Aerospace and Power Generation

Provides oxidation resistance up to 982°C (1800°F), making it suitable for exhaust ducting and high-temperature applications as per AMS 5581.

Marine and Exhaust Systems

Inconel 625 tubing resists thermal fatigue in motorsport and marine exhaust systems, with a melting point of approximately 1320°C (2405°F).

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Inconel 625 Tube vs Inconel 625 Pipe

The table below covers key distinctions relevant to procurement.

Parameter Inconel 625 Tube Inconel 625 Pipe
Ordering Basis Exact OD and wall thickness Nominal Pipe Size (NPS) and schedule
Primary Standard ASTM B444 / ASME SB-444 ASTM B444 (pipe section)
Dimensional Tolerance Tighter Wider
Typical Use Instrumentation, heat exchangers Process piping, structural lines

Shipping & Packaging

Main export packaging setup Heavy-duty wooden boxes Packing
Export Packaging Standard

We strictly follow seaworthy export handling standards to protect inconel 625 pipes from transit damage, moisture ingress, and surface contamination during long-distance dispatch.

  • Heavy-duty wooden boxes with moisture barrier lining
  • HDPE stretch film wrapping on all bundles
  • Plastic end caps on threaded and plain-end pipes
  • Silica gel desiccants to minimize moisture exposure
  • ISPM-15 fumigated wooden packaging for export
shipping preparation Pipe Bundle Yard Staging
Shipping packaging Container End-Cap Protection
Shipping stock Wrapped Export-Ready Bundles

We Export Worldwide

Sachiya Steel International supplies inconel products to major industrial markets across North America, Europe, the Middle East, Asia and Africa with export-ready documentation and logistics support.

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Frequently Asked Questions: Inconel 625 Tube

What Sizes Are Available for Inconel 625 Tubes?+
Seamless tubes are available from 1/4" to 3" OD with walls from 0.020" to 0.375". Welded tubes go up to 7" OD. Custom sizes are supplied on request.
What Is the Difference Between ASTM B444 Grade 1 and Grade 2?+
Grade 1 is annealed with higher strength (120 ksi tensile, 60 ksi yield). Grade 2 is solution treated (100 ksi tensile, 40 ksi yield) and optimised for corrosion resistance above 1000 °F.
What Is the Pressure Rating of Inconel 625 Tubing?+
Pressure ratings depend on OD, wall thickness, temperature, and design code. Calculate using the minimum yield strength of 60 ksi for Grade 1 per ASME B31.3 or ASME BPVC.
What Is the P-Number for Inconel 625 Tube Welding?+
Inconel 625 is assigned ASME P-Number 43. The recommended filler is ERNiCrMo-3 (AWS A5.14) for GTAW welding.
What Is the Difference Between Inconel 625 Tube and Pipe?+
Tubes are ordered by exact OD and wall thickness per ASTM B444. Pipes follow NPS and schedule designations.
Can Inconel 625 Tube Be Used for Exhaust Systems?+
Yes. Inconel 625 exhaust tubing is used in motorsport and marine applications due to its oxidation resistance up to 982 °C (1800 °F).
What Is the Price of Inconel 625 Tube?+
Inconel 625 tube pricing is ₹2,000 and ₹4,000 per kg or $25 - $100+ USD per kg. Contact us for a quote.
What Welding Filler Is Used for Inconel 625 Tubes?+
The matching filler metal is ERNiCrMo-3 (AWS A5.14) for GTAW (TIG) welding. Keep the interpass temperature below 150 °C.

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