Inconel 800H / 800HT Pipes | Inconel 800H / 800HT Seamless & Welded Pipes

Name: Inconel 800H / 800HT Pipes | Inconel 800H / 800HT Seamless & Welded Pipes
Brand: Solitaire Overseas

Inconel 800H / 800HT Pipes | Inconel 800H / 800HT Seamless Pipes | Inconel 800H / 800HT Welded Pipes | Manufacturer, Stockist & Exporter in India

Solitaire Overseas is a leading manufacturer, stockist, and exporter of Incoloy 800H / 800HT Pipes, widely searched in the market as Inconel 800H / 800HT Pipes, in India. As a trusted supplier of high-temperature nickel alloys, we provide both Inconel 800H / 800HT Seamless Pipes and Inconel 800H / 800HT Welded Pipes in compliance with ASTM B407, ASTM B514 and ASME SB standards.

These grades are advanced modifications of Alloy 800, developed to enhance creep and stress-rupture strength at elevated temperatures. For applications operating below 1100°F where enhanced creep resistance is not required, the standard grade Incoloy 800 Pipes may be specified as a cost-effective alternative.

Explore our complete range of Inconel Products, including specialized grades under our Inconel Pipes Supplier and Inconel Tubes Supplier categories.

Incoloy 800H (UNS N08810 / DIN W.Nr. 1.4958) is a nickel–iron–chromium alloy engineered for superior performance at elevated temperatures. It contains a controlled carbon content (0.05–0.10%) that promotes a coarser grain structure (ASTM No. 5 or coarser) after high-temperature solution annealing at approximately 2100°F (1150°C). This optimized microstructure gives Incoloy 800H Pipes significantly improved creep and stress-rupture resistance in the 1100°F–1800°F (593°C–980°C) service range.

Incoloy 800HT (UNS N08811 / DIN W.Nr. 1.4959) further refines the chemistry by restricting the combined aluminum and titanium content to 0.85–1.20% and the carbon range to 0.06–0.10%. When solution-annealed at a minimum of 2100°F (1149°C), this deliberate chemistry control produces the highest creep-rupture strength within the 800 family making Incoloy 800HT Pipes and Inconel 800HT Pipes the preferred choice for demanding elevated-temperature structural applications above 700°C.

Key Distinction: Alloys 800, 800H, and 800HT share the same base nickel, chromium, and iron content. The differences lie in carbon, aluminum, and titanium control plus heat treatment, which translate directly into different high-temperature mechanical performance levels.

Material Grade

Incoloy 800H / 800HT

UNS No.

N08810 / N08811

DIN W.Nr.

1.4958 / 1.4959

Primary Standard

ASTM B407 / ASME SB407

Pipe Types

Seamless & Welded (ERW/EFW)

Melting Range

2475 – 2525°F (1357 – 1384°C)

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Inconel 800H / 800HT Seamless Pipes

Our Inconel 800H Seamless Pipes and Inconel 800HT Seamless Pipes are manufactured in accordance with ASTM B407 / ASME SB407 standards using hot extrusion followed by cold drawing for precise dimensional accuracy and superior metallurgical integrity.

Seamless construction ensures:

Superior pressure containment capability
Uniform wall thickness across the pipe length
Enhanced structural stability at elevated temperatures
Improved long-term creep rupture strength

These Inconel 800H / 800HT Seamless Pipes are widely used in:

Steam methane reformers
Superheater and reheater systems
Ethylene furnace pigtails
High-temperature process piping

For critical ASME Section I and Section VIII applications, seamless Inconel 800H / 800HT Pipes are preferred due to their higher allowable stresses and enhanced metallurgical stability during prolonged high-temperature exposure.

Inconel 800H / 800HT Welded Pipes

We manufacture Inconel 800H / 800HT Welded Pipes under ASTM B514 / ASME SB514 and ASTM B515 standards in ERW and EFW construction for both medium and large diameter requirements.

These welded Incoloy 800H / 800HT Pipes are suitable for:

Large diameter process piping systems
Low-to-medium pressure applications
Structural high-temperature ducting
Heat exchanger shells and furnace casings

All Inconel 800H / 800HT Welded Pipes are solution annealed at ≥2100°F to restore creep properties and relieve residual stresses after welding. Recommended filler metals include ERNiCr-3 and ENiCrFe-3 to maintain high-temperature mechanical integrity.

Specifications & Standards of Incoloy 800H / 800HT Pipes

Our Incoloy 800H / 800HT pipes are manufactured, tested, and certified to the following international standards:

Specification Type	Details
Seamless Pipe/Tube	ASTM B407 / ASME SB407
Welded Pipe	ASTM B514 / ASME SB514
Welded Tube	ASTM B515 / ASME SB515
Condenser Tubes	ASTM B163
Seamless Pipe (Large)	ASTM B829
Welded Tube (Gen)	ASTM B751 / B775
Form	Round, Square, Rectangular
Surface Finish	Annealed, Pickled, Polished
Ends	Plain, Beveled, Threaded
Process	Hot-Rolled / Cold-Drawn
Heat Treatment	Solution Annealed ≥ 2100°F
Testing	Hydro / Eddy Current
Mill Test Certificate	EN 10204 / 3.1B
NACE Compliance	Available on request
Radiography	As per requirement
PMI	Positive Material ID
Heat No. Traceability	Full batch traceability
Certifications	ISO 9001:2015

Chemical Composition of Inconel 800H / 800HT Seamless Pipes & Inconel 800H / 800HT Welded Pipes

The chemical composition of Incoloy 800H / 800HT Pipes is tightly controlled to ensure consistent high-temperature performance. 800HT chemistry always falls within the overall limits of 800H but with restricted aluminum and titanium content to guarantee superior creep resistance.

Element	Incoloy 800H (N08810)	Incoloy 800HT (N08811)
Nickel (Ni)	30.0 – 35.0%	30.0 – 35.0%
Chromium (Cr)	19.0 – 23.0%	19.0 – 23.0%
Iron (Fe)	Balance	Balance
Carbon (C)	0.05 – 0.10%	0.06 – 0.10%
Aluminum (Al)	0.15 – 0.60%	0.25 – 0.60%
Titanium (Ti)	0.15 – 0.60%	0.25 – 0.60%
Al + Ti (combined)	0.30 – 1.20%	0.85 – 1.20%
Manganese (Mn)	1.50% max	1.50% max
Silicon (Si)	1.00% max	1.00% max
Copper (Cu)	0.75% max	0.75% max
Sulfur (S)	0.015% max	0.015% max

Mechanical Properties - Inconel 800H / 800HT High-Temperature Strength

The following room-temperature mechanical properties apply to annealed material as per ASTM B407:

Property	Incoloy 800H (N08810)	Incoloy 800HT (N08811)
Tensile Strength (min)	75 ksi (517 MPa)	65 ksi (448 MPa)
Yield Strength 0.2% Offset (min)	30 ksi (207 MPa)	25 ksi (170 MPa)
Elongation (min)	30%	30%
Hardness (Rockwell)	≤ 96 HRB	≤ 96 HRB
Density	0.291 lb/in³ (8.05 g/cm³)	0.291 lb/in³ (8.05 g/cm³)
Modulus of Elasticity	28.5 × 10⁶ psi (196 GPa)	28.5 × 10⁶ psi (196 GPa)
Grain Size (ASTM)	No. 5 or coarser	No. 5 or coarser

High-Temperature Performance of Inconel 800H / 800HT Pipes

The defining advantage of Incoloy 800H / 800HT Pipes and Inconel 800H / 800HT Pipes lies in their superior creep and stress-rupture strength. Compared to standard Alloy 800, both 800H and 800HT demonstrate significantly higher rupture life in the 1100–1800°F temperature range.

800HT provides higher allowable stresses under ASME Code Case provisions and is widely specified for critical high-temperature structural components in power boilers, pressure vessels, and nuclear steam systems.

Corrosion & Oxidation Resistance of Inconel 800H / 800HT Pipes

Incoloy 800H / 800HT Pipes provide:

Excellent oxidation resistance up to 2000°F
Strong resistance to carburization in hydrocarbon environments
Good resistance to sulfidation atmospheres
Resistance to internal oxidation due to balanced iron content
Stable austenitic microstructure with controlled carbide precipitation

These characteristics make Inconel 800H / 800HT Pipes suitable for cyclic furnace environments, reformer tubing, and demanding petrochemical processing systems.

Applications of Inconel 800H / 800HT Pipes for High-Temperature Service

Incoloy 800H and 800HT Pipes are widely used in industries where sustained high-temperature exposure combines with aggressive service conditions:

Petrochemical Furnaces: Ethylene cracker pigtails, steam methane reformer headers

Power Generation: Superheater & reheater tubing in coal and nuclear power plants

Chemical Processing: Heat exchangers, reaction vessels, process piping in aggressive media

Heat-Treating Equipment: Radiant tubes, muffles, retorts, furnace fixtures

Nuclear Industry: Steam generator tubing; ASME Section III compliant

Oil & Gas: High-temp process piping, wellhead components

Industrial Heating: Gas turbine components, exhaust systems, ducting

Pressure Vessels: ASME Section VIII Div.1 service up to 1800°F (982°C)

Available Product Types

Incoloy 800H Seamless Pipes
Incoloy 800HT Seamless Pipes
Inconel 800H / 800HT Welded Pipes
EFW & ERW Pipes
Custom thickness heavy-wall pipes
Large diameter ASTM B829 pipes

Looking for Bulk Pricing or Custom Dimensions?

Our team is ready to assist with full MTC, project-specific certifications, and competitive pricing for any quantity of ASTM B407 UNS N08810 / N08811 pipes.

Frequently Asked Questions

What is the difference between Incoloy 800H and 800HT?

800HT is a refinement of 800H. Both share the same base Ni-Cr-Fe chemistry, but 800HT has a tighter carbon range (0.06–0.10% vs. 0.05–0.10%) and a restricted combined Al+Ti content of 0.85–1.20% (vs. 0.30–1.20% for 800H). This, combined with a mandatory high-temperature anneal at ≥2100°F, gives 800HT the highest creep-rupture strength of the 800 family.

What standards apply to Inconel 800H / 800HT pipes?

The primary standard is ASTM B407 / ASME SB407 for seamless pipes and ASTM B514 / ASME SB514 for welded pipes. Other applicable standards include ASTM B163, B515, B775, B829, and B751. ASME Section VIII and Section III code cases also cover 800H/800HT for pressure vessel and nuclear applications.

Up to what temperature can Incoloy 800H / 800HT be used?

Incoloy 800 is typically used up to 1100°F (593°C). Alloys 800H and 800HT are specifically designed for service above 1100°F, with ASME Section VIII permitting construction up to 1500°F (816°C) and Code Case 1983 allowing up to 1800°F (982°C).

Do you supply Incoloy 800H / 800HT pipes with full MTC?

Yes. All our pipes are supplied with EN 10204 / 3.1B Mill Test Certificates covering chemical composition, mechanical properties, heat treatment details, and applicable test results. PMI, radiography, and NACE compliance reports are available on request.

What filler metal is recommended for welding Incoloy 800HT?

AWS A5.14 ERNiCr-3 filler wire is recommended for GTAW/GMAW processes, while ENiCrFe-3 electrodes are suitable for SMAW. Post-weld annealing at a minimum of 2100°F (1149°C) is required to restore full creep and rupture properties in the heat-affected zone.