Incoloy 825 (Nickel Alloy 825 / UNS N08825) is a nickel-iron-chromium alloy with additions of molybdenum, copper and titanium. With minimum nickel content of 38-46%, combined with Mo, Cu and Ti, Incoloy 825 delivers enhanced corrosion resistance across both reducing and oxidising environments making it superior to Incoloy 800 for aqueous corrosion service. It is especially resistant to sulfuric and phosphoric acids.
Alloy 825 pipe is typically specified when corrosion resistance must hold up in mixed acid environments, chloride-containing media, and sour gas wells where common stainless grades fail. For the highest wet corrosion severity, compare with Inconel 625 Pipes & Tubes.
USA Piping Solution manufactures and exports ASTM B423 / ASME SB423 alloy 825 seamless pipe and Incoloy 825 tube in a full range of sizes and schedules. We also supply Inconel Plates & Sheets in alloy 825. Browse our complete Nickel Alloy Pipes & Tubes range. USA Piping Solution is an ISO 9001:2015 certified exporter of ASTM B423 Incoloy 825 seamless pipe and tube with [X] years of experience serving the oil & gas, chemical processing, nuclear, and offshore sectors across [N]+ countries. All orders are supplied with EN 10204 Type 3.1 Material Test Certificates and NACE MR0175 compliance documentation available on request.
Incoloy 825 Features
Density 8.14 g/cm³ (0.294 lb/in³). Tensile strength 586 MPa (85 ksi) minimum. Yield strength 241 MPa (35 ksi) minimum. Incoloy 825 provides excellent resistance to both reducing and oxidising acids, to stress-corrosion cracking, and to localised attack such as pitting and crevice corrosion. The high comprehensive performance of Incoloy 825 is demonstrated in nuclear combustion dissolvers handling mixed sulfuric acid, nitric acid, and sodium hydroxide simultaneously in the same equipment.
In procurement and receiving, MTC must list chemistry and mechanical results by heat number, with marking on each piece or bundle cross-checked against the packing list. For NACE MR0175 sour gas service, material must be supplied in the annealed condition with hardness certified below the applicable limits.
Incoloy 825 Pipe & Tube Specifications
| Parameter | Details |
|---|---|
| Standards (Seamless) | ASTM B423 / ASME SB423 |
| Standards (Welded) | ASTM B705 / ASME SB705 |
| Standards (HX Tube) | ASTM B163 / ASME SB163 |
| Dimensions | ANSI/ASME B36.10 & B36.19 |
| OD Range - Seamless | 6.35 mm (1/4") to 219 mm |
| OD Range - Welded | Up to 1219 mm |
| Wall Thickness | 0.5 mm to 20 mm (seamless); up to 60 mm (special) |
| Schedules | SCH 5S, 10S, 40S, 80S, 120, 160, XXS |
| Form | Round, Square, Rectangular, U-Bend, Hydraulic, Protection Tube |
| Length | SRL (17-24 ft), DRL (36-44 ft), Cut-to-Length up to 20 m |
| Delivery Condition | Hot Finished, Cold Drawn, Annealed & Pickled (AP), Bright Annealed (BA) |
| End Types | Plain End, Beveled End, Threaded |
| Surface Finish | As-drawn (0.4 µm Ra), Electropolished (0.1 µm Ra), Polished, MF |
| Certification | EN 10204 3.1 / 3.2 MTC, PED, DNV, TUV, NACE |
Equivalent Grades - Incoloy 825 / UNS N08825
| Trade Name | UNS No. | DIN / Werkstoff | British Standard | Euronorm | JIS | AFNOR |
|---|---|---|---|---|---|---|
| Incoloy 825 | N08825 | 2.4858 | NA 16 | NiCr21Mo | NCF 825 | Z8NiCrMoCuTi42-21 |
AFNOR designation Z8NiCrMoCuTi42-21 captures European and French-market procurement searches and is not listed by most competitor pages.
Chemical Composition of Incoloy 825 Pipes (ASTM B423 / UNS N08825)
Titanium content (0.6-1.2%) forms titanium carbides preferentially over chromium carbides, preventing sensitisation and eliminating the need for post-weld heat treatment.
| Element | Ni | Cr | Fe | Mo | Cu | Ti | C | Mn | Si | Al | S |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Min (%) | 38.0 | 19.5 | 22.0 | 2.5 | 1.5 | 0.6 | - | - | - | - | - |
| Max (%) | 46.0 | 23.5 | Bal. | 3.5 | 3.0 | 1.2 | 0.05 | 1.0 | 0.5 | 0.2 | 0.03 |
Mechanical Properties of Alloy 825
| Property | Tensile Strength (min) | Yield Strength 0.2% (min) | Elongation (min) | Hardness (max) |
|---|---|---|---|---|
| Incoloy 825 (Annealed) | 85 ksi / 586 MPa | 35 ksi / 241 MPa | 30% | 95 HRB |
Physical Properties of Alloy 825 Pipe
| Physical Property | Value |
|---|---|
| Density | 8.14 g/cm³ (0.294 lb/in³) |
| Melting Range | 1370-1400°C (2500-2550°F) |
| Specific Heat (20°C) | 440 J/kg·°C |
| Thermal Conductivity | 11.1 W/m·K |
| Modulus of Elasticity | 196 GPa (28.4 x 106 psi) |
| Thermal Expansion (20-100°C) | 14.0 µm/m·°C |
| Electrical Resistivity | 1.13 µΩ·m |
Incoloy 825 Pipe Schedule & Wall Thickness Chart
Wall thickness values in inches per ANSI/ASME B36.10 and B36.19.
| NPS | OD (inches) | SCH 10S | SCH 40S / Std | SCH 80S / XH | SCH 160 | XXS |
|---|---|---|---|---|---|---|
| 1/8" | 0.405 | 0.049 | 0.068 | 0.095 | - | - |
| 1/4" | 0.540 | 0.065 | 0.088 | 0.119 | - | - |
| 3/8" | 0.675 | 0.065 | 0.091 | 0.126 | - | - |
| 1/2" | 0.840 | 0.083 | 0.109 | 0.147 | 0.187 | 0.294 |
| 3/4" | 1.050 | 0.083 | 0.113 | 0.154 | 0.219 | 0.308 |
| 1" | 1.315 | 0.109 | 0.133 | 0.179 | 0.250 | 0.358 |
| 1 1/2" | 1.900 | 0.109 | 0.145 | 0.200 | 0.281 | 0.400 |
| 2" | 2.375 | 0.109 | 0.154 | 0.218 | 0.343 | 0.436 |
| 3" | 3.500 | 0.120 | 0.216 | 0.300 | 0.438 | 0.600 |
| 4" | 4.500 | 0.120 | 0.237 | 0.337 | 0.531 | 0.674 |
| 6" | 6.625 | 0.134 | 0.280 | 0.432 | 0.718 | 0.864 |
| 8" | 8.625 | 0.148 | 0.322 | 0.500 | 0.906 | 0.875 |
| 10" | 10.750 | 0.165 | 0.365 | 0.500 | 1.125 | 1.000 |
| 12" | 12.750 | 0.180 | 0.406 | 0.500 | 1.312 | 1.000 |
Incoloy 825 Seamless Pipe Weight Chart (kg/m)
| NPS | OD (mm) | SCH 40S STD Wall (mm) / kg/m | SCH 80S XH Wall (mm) / kg/m | lb/ft (SCH 40S) |
|---|---|---|---|---|
| 1/2" | 21.34 | 2.77 / 1.27 | 3.73 / 1.62 | 0.85 |
| 3/4" | 26.67 | 2.87 / 1.69 | 3.91 / 2.20 | 1.13 |
| 1" | 33.40 | 3.38 / 2.50 | 4.55 / 3.24 | 1.68 |
| 1 1/2" | 48.26 | 3.68 / 4.05 | 5.08 / 5.41 | 2.72 |
| 2" | 60.33 | 3.91 / 5.44 | 5.54 / 7.48 | 3.65 |
| 3" | 88.90 | 5.49 / 11.29 | 7.62 / 15.27 | 7.58 |
| 4" | 114.30 | 6.02 / 16.07 | 8.56 / 21.77 | 10.79 |
| 6" | 168.28 | 7.11 / 28.26 | 10.97 / 42.55 | 18.97 |
| 8" | 219.08 | 8.18 / 42.55 | 12.70 / 64.63 | 28.55 |
Weights calculated using Incoloy 825 density of 8.14 g/cm³. For non-standard schedules or custom wall thicknesses, contact our team for exact certified weights.
Incoloy 825 Tube Size Chart
Standard Incoloy 825 seamless tube dimensions available from stock and to order per ASTM B163 / ASTM B423:
| OD (mm) | Available Wall Thickness (mm) | Standard |
|---|---|---|
| 6.00 | 0.5, 0.7, 1.0, 1.5 | ASTM B163 |
| 8.00 | 0.5, 0.7, 1.0, 1.5, 2.0 | ASTM B163 |
| 10.00 | 0.7, 1.0, 1.5, 2.0 | ASTM B163 |
| 12.00 | 1.0, 1.5, 2.0, 2.5 | ASTM B163 |
| 14.00 | 1.0, 1.5, 2.0, 2.5 | ASTM B163 |
| 16.00 | 1.0, 1.5, 2.0, 2.5, 3.0 | ASTM B163 |
| 19.05 (3/4") | 1.0, 1.2, 1.5, 2.0, 2.5, 3.0 | ASTM B163 |
| 25.40 (1") | 1.2, 1.5, 2.0, 2.5, 3.0, 3.5 | ASTM B163 |
| 31.75 (1 1/4") | 1.5, 2.0, 2.5, 3.0, 3.5 | ASTM B163 |
| 38.10 (1 1/2") | 1.5, 2.0, 2.5, 3.0, 4.0 | ASTM B163 |
| 50.80 (2") | 2.0, 2.5, 3.0, 4.0, 5.0 | ASTM B163 |
| 63.50 (2 1/2") | 2.0, 2.5, 3.0, 4.0, 5.0, 6.0 | ASTM B163 |
| 76.20 (3") | 2.5, 3.0, 4.0, 5.0, 6.0 | ASTM B163 |
| 101.60 (4") | 3.0, 4.0, 5.0, 6.0, 8.0 | ASTM B163 |
| 168.28 (6") | 4.0, 5.0, 6.0, 8.0, 10.0 | ASTM B163 |
Custom OD and wall thickness combinations available on request. U-bend form available for heat exchanger applications. Contact us for Incoloy 825 tube price.
Incoloy 825 Products
USA Piping Solution supplies a comprehensive range of Incoloy 825 product forms to cover all fabrication requirements in chemical, oil and gas, offshore, and nuclear industries:
- Incoloy 825 Seamless Pipe (ASTM B423): No weld seam; preferred for high-pressure sour gas and acid service. OD 6.35 mm-219 mm.
- Incoloy 825 Welded Pipe (ASTM B705): ERW / EFW / LSAW forms for large-diameter and structural applications.
- Alloy 825 Heat Exchanger Tube (ASTM B163): Seamless tube for shell-and-tube exchangers; U-bend form available.
- Alloy 825 Cold Drawn Seamless Tube: Close-tolerance precision tube for instrumentation and hydraulic control lines.
- Incoloy 825 ERW Pipe: Consistent dimensional accuracy; cost-effective for general process piping.
- Incoloy 825 Clad Pipe (CRA): Carbon steel pipe clad with alloy 825 for corrosion resistance at reduced cost for large-bore pipelines.
- Alloy 825 Protection Tube: Thermocouple sheaths and instrument protection in corrosive acid environments.
- Alloy 825 Square & Rectangular Tube: For structural supports in corrosive process environments.
RFQ Parameters by Product Form
| Product Form | Standard | Key RFQ Items |
|---|---|---|
| Seamless Pipe | ASTM B423 / ASME SB423 | OD, wall/schedule, length, condition (AP/BA), MTC 3.1/3.2, NACE cert if required |
| Welded Pipe | ASTM B705 / ASME SB705 | OD, wall, weld type (ERW/EFW/LSAW), NDT scope (UT/RT), end condition |
| HX Tube (Seamless) | ASTM B163 / ASME SB163 | OD, wall, length, U-bend radius if required, surface finish (AP/BA/EP) |
| Cold Drawn Tube | ASTM B163 precision | OD tolerance class, wall tolerance, finish (ID/OD Ra), test method |
Welding Process of Incoloy 825 Pipes
Incoloy 825 pipe is readily weldable using GTAW (TIG), GMAW (MIG), SMAW, and SAW processes. The recommended filler metal is ERNiCrMo-3 (Alloy 625 wire) for GTAW/GMAW and ENiCrMo-3 for SMAW. Key requirements:
- No pre-heat required for standard wall thickness.
- No post-weld heat treatment (PWHT) required because titanium stabilisation prevents sensitisation.
- Keep interpass temperature below 175°C (347°F).
- Back purge with argon for root passes in corrosion-critical piping.
- Argon or argon/helium shielding gas recommended for GTAW.
Advantages of Incoloy 825 Pipes & Tubes
- Excellent resistance to both reducing and oxidising acids such as sulfuric, phosphoric, and nitric.
- No post-weld heat treatment required because titanium stabilisation eliminates sensitisation risk.
- Helps avoid chloride stress-corrosion cracking because 38-46% Ni provides SCC immunity.
- Stops localised attacks such as pitting and crevice corrosion due to molybdenum addition.
- NACE MR0175 / ISO 15156 compliant for H2S sour gas service.
- High level of resistance to nitric acid, nitrates, and oxidising salts because of chromium addition.
- Maintains austenitic structure from cryogenic temperatures to 538°C.
- Economical alternative to Inconel 625 where maximum pitting severity is not required.
Applications for Incoloy 825 Pipes & Tubes
Due to its superior multi-environment corrosion resistance, Incoloy 825 is specified across a wide range of demanding industries:
- Chemical processing components such as acid reactors, evaporators, and piping.
- Oil and gas production tubing, completion tubing, and sour gas well service.
- Sulfuric acid piping, vessels, and heat exchangers.
- Phosphoric acid evaporators and process equipment.
- Pickling tank heaters, pickling tanks, and associated equipment.
- Marine exhaust systems and seawater heat exchangers.
- Pollution control equipment such as flue gas desulfurisation scrubbers.
- Calorifiers, tank trucks, and ammonium sulfate vessels.
- Hot vessels for food, water, and seawater.
- Nuclear fuel reprocessing equipment and radioactive waste handling.
- Electrostatic precipitator electrodes.
- Expansion bellows in corrosive service.
Sour gas procurement specification: For NACE MR0175 sour gas applications, always specify ASTM B423 standard, annealed supply condition, NACE MR0175 hardness limits, and EN 10204 3.1 MTC with heat traceability. For the highest pitting and seawater severity, consider upgrading to Inconel 625 Pipes & Tubes.
Incoloy 825 Pipe & Tube Price (Indicative)
The price of Incoloy 825 pipe depends on diameter, wall thickness, schedule, quantity, delivery condition, certification requirements, and current nickel alloy market rates. Indicative price ranges are provided below. Contact USA Piping Solution for an exact quotation:
| Product Type | Standard | Indicative Price (USD/kg) |
|---|---|---|
| Incoloy 825 Seamless Pipe (small bore, SCH 40) | ASTM B423 | USD 28-55 |
| Incoloy 825 Seamless Pipe (large bore, >= 4" NB) | ASTM B423 | USD 22-42 |
| Incoloy 825 Welded Pipe | ASTM B705 | USD 18-35 |
| Alloy 825 HX Tube (ASTM B163) | ASTM B163 | USD 30-58 |
| Alloy 825 Cold Drawn Precision Tube | ASTM B163 precision | USD 38-70 |
| Incoloy 825 ERW Pipe | ASTM B705 | USD 16-32 |
Prices are indicative and subject to change based on current nickel commodity rates, order quantity, dimensional specification, delivery condition (AP/BA), and certification requirements. Contact USA Piping Solution for an exact, up-to-date quotation.
Ready to source Incoloy 825 pipes and tubes? Contact USA Piping Solution for a precise quote tailored to your project specifications. Fast lead times. EN 10204 3.1 MTC with every order.
Request a QuoteRelated Products
Inconel 600 Pipes | Inconel 601 Pipes | Inconel 625 Pipes | Inconel 718 Pipes | Incoloy 800 Pipes | Nickel Alloy Pipes | Inconel Seamless Inconel Pipe | Inconel Welded Inconel Pipe
FAQ's About Incoloy 825 Pipes & Tubes
Does Incoloy 825 require post-weld heat treatment (PWHT)?
No. Incoloy 825 pipes do not require PWHT because titanium (0.6-1.2%) prevents sensitisation during welding by forming titanium carbides preferentially over chromium carbides, allowing Alloy 825 pipe fabrications to be used directly after welding without risk of intergranular corrosion.
What is the difference between Incoloy 825 and Incoloy 800?
Incoloy 825 pipe offers superior corrosion resistance in sulfuric acid, phosphoric acid, chloride media, and sour gas environments due to its molybdenum, copper, and titanium additions. Incoloy 800 is mainly designed for high-temperature oxidation and carburisation resistance in furnace and heat-treating applications. For aqueous corrosion service, Incoloy 825 significantly outperforms Incoloy 800.
What is the difference between Incoloy 825 and Inconel 625?
Incoloy 825 pipe is the preferred choice for acid corrosion and sour gas service in mixed-acid environments. Inconel 625 pipe provides a higher level of resistance to seawater, pitting, crevice corrosion, and extreme chloride environments where maximum corrosion severity is required. Inconel 625 is also stronger and more suitable for dynamic subsea applications. Incoloy 825 is the more economical option where maximum pitting severity is not a design requirement.
Is Incoloy 825 suitable for sour gas (H2S) service?
Yes. Incoloy 825 pipes meet NACE MR0175 / ISO 15156 requirements and resist sulfide stress cracking, making Alloy 825 pipe suitable for sour gas oil and gas applications. For NACE MR0175 service, specify material in the annealed condition with hardness certified below the applicable NACE limits and supply with EN 10204 Type 3.1 MTC with full heat traceability.
What sizes are available for Incoloy 825 pipe and tube?
Incoloy 825 seamless pipes are available from 6.35 mm (1/4") to 219 mm OD per ASTM B423 / ASME SB423, across schedules SCH 5S through XXS. Welded pipes can reach up to 1219 mm diameter per ASTM B705. Heat exchanger tubes per ASTM B163 are available from 6 mm OD with wall thicknesses from 0.5 mm to 20 mm.
What is the Incoloy 825 pipe price?
The price of Incoloy 825 pipe depends on diameter, wall thickness, schedule, quantity, and nickel alloy market rates. Seamless Alloy 825 pipe typically costs more than welded pipe. Indicative prices range from USD 18-55 per kg depending on product form and specification. Contact USA Piping Solution with your specific size and quantity for an exact quotation.