What Are Inconel 725 Pipes?

Inconel 725 Pipes (UNS N06725) are high-strength nickel-chromium-molybdenum alloy pipes strengthened by precipitation hardening. This alloy is also good in preventing corrosion, pitting, crevice corrosion, stress corrosion cracking in harsh conditions. Inconel 725 Pipe is commonly employed in oil and gas, marine and chemical processing industries where high mechanical strength and resistance against corrosion are needed at the same time.

We are offering Inconel 725 Pipes in both seamless and welded varieties fully certified and third party checked according to the international standards.

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Specification of Inconel 725 Pipes

Specification	Details
Standards	ASTM B444 (Seamless), ASTM B705 (Welded), ASME SB444 / SB705, AISI, DIN, EN, JIS
Types	Seamless, Welded, ERW (Electric Resistance Welded)
Size Range	8" NB to 24" NB
Production Technique	Decoiling, Punching, Bending, Welding, Cutting, Moulding
Form	Round, Hydraulic, Coiled, Square, U Shape, Rectangular, Straight, Honed Tubes, Pan Cake Coils
Thickness Range	SCH 5, SCH 10, SCH 40, SCH 80, SCH 80S, SCH 160, SCH XS, SCH XXS, SCH XXH
Customization	Custom Size and Thickness available upon request
End Connections	Threaded, Beveled End, Plain End
Surface Finish	2B, BA, No.1, No.4, No.8 Mirror, HL, 180G, 320G, 400G, 600G, 800G Mirror Finish, or Custom Finish
Test Certificates	EN 10204 3.1 / 3.2, MTC, Third-Party Inspection, 100% Radiography, Govt. Approved Lab Reports

Chemical Composition of UNS N07725 Pipes

The balanced chemical composition of Inconel 725 Pipe provides superior resistance to sulfide stress cracking and chloride-induced corrosion. The high molybdenum and niobium content makes it particularly effective in sour gas environments.

Elements	Content (%)
Nickel (Ni)	55 – 59
Chromium (Cr)	19 – 22.5
Iron (Fe)	7 – 11
Molybdenum (Mo)	7 – 9.5
Niobium (Nb + Cb)	2.75 – 4
Titanium (Ti)	1 – 1.7
Aluminum (Al)	Max 0.35
Manganese (Mn)	Max 0.35
Silicon (Si)	Max 0.20
Carbon (C)	Max 0.030
Phosphorus (P)	Max 0.015
Sulfur (S)	Max 0.010

Alloy 725 Pipes Physical Properties

The physical constants of Inconel 725 ensure it maintains structural stability under extreme pressure.

Properties	Metric	Imperial
Density	8.3 g/cm³	0.30 lb/in³
Melting Point	1271 – 1343°C	2320 – 2449°F

Mechanical Properties of Inconel 725 Nickel Alloy Pipes

In the precipitation-hardened condition, Inconel 725 Pipes achieve significantly higher strength levels compared to solution-annealed grades. Note that properties may vary depending on the specific heat treatment condition applied.

Properties	Metric	Imperial
Tensile Strength	855 MPa	124,000 psi
Yield Strength (0.2% Offset)	427 MPa	62,000 psi
Modulus of Elasticity	204 GPa	29,600 ksi
Poisson’s Ratio	0.31	0.31
Elongation at Break	57%	57%

Thermal Properties of Inconel Alloy 725 Pipes

These thermal characteristics are vital for engineering calculations in high-temperature piping systems to prevent buckling or joint stress.

Properties	Metric	Imperial
Thermal Expansion Coefficient (21–100°C)	13 µm/m°C	7.22 µin/in°F

Types of Inconel 725 Pipes

Inconel 725 Seamless Pipes

Inconel 725 Welded Pipes

Inconel 725 ERW Pipes

ASTM B167 725 Polished Pipes

ASTM B167 725 Cold Drawn Pipes

ASTM B167 725 Customized Pipes

Werkstoff Nr. 2.4856 Square Pipes

Werkstoff Nr. 2.4856 Rectangular Pipes

Werkstoff Nr. 2.4856 Hollow Pipes

Application of Alloy 725 Pipes

Inconel 725 Pipes are widely used in:

Aerospace Components
Oil and Gas Production Systems
Subsea Equipment
Power Plants
Chemical Processing Units
Refineries
Shipbuilding and Marine Applications
Water Injection Systems
Pharmaceutical Equipment

These industries prefer Inconel 725 Pipe due to its excellent resistance to sour gas environments and high-pressure service conditions.

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