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Incoloy Tube | 800, 840, 825, 926

Incoloy Stainless steel tubes

Overview

Incoloy alloys are nickel-iron-chromium-based materials engineered to perform exceptionally in high-temperature and high-corrosion environments. Their optimized balance of nickel (Ni), chromium (Cr), and iron (Fe) delivers superior resistance to:

· Oxidation and carburization

· Pitting and crevice corrosion

· Stress Corrosion Cracking (SCC)

· Sulfidation and intergranular attack

These tubes are widely used across oil & gas, chemical processing, power generation, marine desalination, pharmaceuticals, and heat exchanger systems.

Available forms: Seamless tubes, welded tubes, coiled tubing

Surface finishes: Bright Annealed (BA), Pickled, Polished, Bead Blasted, Mirror Finish

Standards: ASTM, ASME, EN, DIN, ISO

Certifications: ISO 9001, EN 10204 3.1 / 3.2, PED 2014/68/EU

Key Features & Benefits

High Corrosion Resistance → Protects against acids, alkalis, seawater, and chlorides

Excellent High-Temperature Performance → Up to 1150°C (Incoloy 840)

Superior Mechanical Strength → Maintains stability under high-pressure and thermal cycling

Good Fabrication & Weldability → Compatible with GTAW, GMAW, SMAW, and SAW processes

Long Service Life → Lower maintenance costs in aggressive environments

Alloy comparison table

Alloy	UNS	Service Temp	Standards	Key Advantages
Incoloy 825	N08825	Up to 540°C	ASTM B423 / SB423	Exceptional resistance to acids, SCC, and seawater
Incoloy 800	N08800	Up to 1100°C	ASTM B407 / SB407	Resists oxidation and carburization at elevated temps
Incoloy 800H	N08810	Up to 1100°C	ASTM B407 / SB407	Higher creep-rupture strength for pressure vessels
Incoloy 840	S33400	Up to 1150°C	ASTM A312 / A213	Ideal for heaters, furnaces, and high-temp exchangers
Incoloy 926	N08926	Up to 400°C	ASTM B677 / SB677	Superior pitting resistance in chloride-rich environments

Chemical composition (%)

Alloy	Ni (%)	Cr (%)	Fe (%)	Mo (%)	Cu (%)	Ti (%)	Others
825	38–46	19.5–23.5	Balance	2.5–3.5	1.5–3.0	0.6–1.2	C ≤ 0.05
800	30–35	19–23	Balance	–	–	0.15–0.6	Al ≤ 0.6
800H	30–35	19–23	Balance	–	–	0.25–0.6	C=0.05–0.10
840	18–20	18–20	Balance	–	–	–	C ≤ 0.08
926	24–26	19–21	Balance	6–7	0.5–1.5	–	N=0.15–0.25

Mechanical properties

Alloy	Yield Strength (MPa)	Tensile Strength (MPa)	Elongation (%)	Hardness (HB)
825	≥220	≥550	≈30	≤200
800	≥205	≥520	≈35	≤200
800H	≥210	≥530	≈30	≤200
840	≈250	≈600	≈25	≤220
926	≥300	≥650	≈35	≤230

Thermal & Physical Properties

Property	825	800/800H	840	926
Density (g/cm³)	8.14	7.94	7.90	8.05
Thermal Conductivity (W/m·K)	11.2	14.5	12.0	11.8
Coefficient of Expansion (µm/m·K)	14.0	13.9	13.6	13.0
Melting Range (°C)	1370–1400	1357–1385	1370–1410	1350–1400

Applications by industry

1.Chemical & Petrochemical: Heat exchangers, reactors, scrubbers

2.Oil & Gas: Downhole tubing, offshore platforms, sour service pipelines

3.Power Generation: Superheaters, reheaters, boiler tubes

4.Desalination & Marine: Evaporators, brine heaters, condensers

5.Pharmaceuticals & Food: High-purity processing equipment

6.Aerospace & Automotive: Turbochargers, exhaust manifolds, high-performance piping

Ordering information

· Specify: Alloy, OD, wall thickness, length, finish, form (seamless/welded)

· Delivery: Cut-to-length up to 12 meters or coils up to 100 meters

· Lead Times: 7–30 days depending on stock and customization

· Packaging: Export-ready, seaworthy bundles with protective end caps

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