لولهٔ بدون درز اینکولوی ۸۰۰ مقاوم در برابر دمای بالا برای مبادله‌کننده‌های بخار

Product Overview

High Temperature Creep Strength in Steam Heat Exchanger Tubing

Operating steam heat exchangers requires materials that withstand severe thermal cycling without deformation. The High Temperature Oxidation Resistant Incoloy 800 Seamless Tube features an optimized austenitic microstructure, providing superior creep-rupture strength up to 800°C (1472°F) and ensuring long-term dimensional stability in critical tube bundles.

Oxidation and Carburization Resistance of Nickel-Iron-Chromium Alloy Tubing

Standard stainless steel degrades rapidly in superheated steam and hydrocarbon atmospheres. High Temperature Oxidation Resistant Incoloy 800 Seamless Tube forms a dense, self-healing chromium oxide layer that effectively blocks oxygen diffusion, resists carburization, and prevents intergranular corrosion under extreme operating conditions.

Precision Dimensional Tolerance Control for High-Pressure Thermal Transfer

Manufactured via multi-pass cold drawing and bright annealing, each High Temperature Oxidation Resistant Incoloy 800 Seamless Tube (OD 12.7mm–50.8mm) maintains tight outer diameter tolerances within $\pm 0.05 mm$ . This precision ensures perfect tube-to-tubesheet expansion, uniform heat transfer, and leak-free performance in high-pressure systems.

Technical Specifications and Parameter Matrix

Parameter Classification	Technical Property / Specification	Value & Performance Criteria
Product Form & Type	Seamless Precision Cold-Drawn Tube	High Temperature Oxidation Resistant Incoloy 800 Seamless Tube
Material Chemistry (wt%)	Nickel (Ni)	30.0% – 35.0%
	Chromium (Cr)	19.0% – 23.0%
	Iron (Fe)	Balance ( $\geq 39.5 %$ )
	Aluminum (Al)	0.15% – 0.60%
	Titanium (Ti)	0.15% – 0.60%
	Carbon (C)	$\leq 0.10 %$
	Manganese (Mn) / Silicon (Si)	$\leq 1.50 %$ / $\leq 1.00 %$
Dimensional Availability	Outer Diameter (OD) Range	12.7mm – 50.8mm (0.50 in – 2.00 in)
	Wall Thickness (WT) Range	0.8mm – 4.0mm (0.031 in – 0.157 in)
	Standard Tube Length	3,000mm – 12,000mm (Custom U-Bend Available)
Mechanical Properties	Tensile Strength ( $R_{m}$ )	$\geq 520 MPa$ (Room Temperature)
	Yield Strength ( $R_{p 0.2}$ )	$\geq 205 MPa$
	Elongation ( $A_{5}$ )	$\geq 30 %$
	Hardness (Annealed State)	$\leq 90 HRB$ (Rockwell B)
Physical & Thermal Data	Density	$7.94 {g/cm}^{3}$
	Melting Range	$1350^{\circ} C– 1400^{\circ} C$ ( $2460^{\circ} F– 2550^{\circ} F$ )
	Thermal Conductivity (at 100°C)	$11.5 W/(m \cdot K)$
	Electrical Resistivity	$\sim 0.98 μ Ω \cdot m$
Quality Verification	Non-Destructive Testing (NDT)	100% Eddy Current Testing + 100% Hydrostatic / Ultrasonic Inspection
	Surface Finish	Bright Annealed (Ra $\leq 0.6 μ m$ ) / Pickled & Passivated
	Delivery Condition	Solution Annealed & Straightened

Key Features

Elevated Temperature Thermal Stability for Superheater and Reheater Tubes

High Temperature Oxidation Resistant Incoloy 800 Seamless Tube maintains structural ductility and high creep strength across continuous thermal cycling. Its stable austenitic matrix prevents sigma-phase embrittlement between 550°C and 700°C, ensuring exceptional thermal fatigue endurance.

Superior Stress Corrosion Cracking Resistance in Industrial Steam Boilers

With a high nickel content of 30%–35%, High Temperature Oxidation Resistant Incoloy 800 Seamless Tube provides outstanding immunity to chloride-induced stress corrosion cracking (SCC) and caustic stress cracking in boiling aqueous and superheated steam media.

Ultra-Smooth Bright Annealed Surface for Minimal Boundary Layer Resistance

Processed via hydrogen-shielded bright annealing, each tube achieves an inner and outer surface roughness of $Ra \leq 0.6 μ m$ . This mirror finish reduces thermal boundary resistance, prevents particulate fouling, and minimizes pressure drop across tube bundles.

Strict Non-Destructive Flaw Detection for Reliable High-Pressure Service

Every High Temperature Oxidation Resistant Incoloy 800 Seamless Tube undergoes 100% automated eddy current testing, ultrasonic wall thickness verification, and hydrostatic pressure testing to ensure zero internal defects, pinholes, or micro-cracks before dispatch.

Industrial Applications

High-Efficiency Steam Heat Exchangers and Condensers

High Temperature Oxidation Resistant Incoloy 800 Seamless Tube withstands extreme differential pressures, corrosive condensate, and turbulent flow erosion in critical shell-and-tube heat exchangers and condensers.

Petrochemical Hydrocarbon Processing and Pyrolysis Furnaces

In ethylene cracking and steam-methane reforming units, High Temperature Oxidation Resistant Incoloy 800 Seamless Tube resists severe carburization, carbon uptake, and metal dusting under high-temperature reducing gases.

Power Generation Superheater and Reheater Boiler Tubing Systems

Thermal and nuclear power facilities utilize High Temperature Oxidation Resistant Incoloy 800 Seamless Tube in superheaters and reheaters to prevent high-temperature steam oxidation and wall thinning.

Industrial Thermal Processing and High-Temperature Gas Cooling Units

Applied in industrial heat-treating furnaces and gas cooling coils, our seamless tubing ensures structural stability, uniform thermal expansion, and reliable heat transfer under direct hot exhaust exposure.

Why Choose DLX for High Temperature Nickel-Iron-Chromium Alloy Tubing

Scalable 1,200 Tons Monthly Capacity with Integrated Manufacturing

DLX Alloy operates modernized vacuum induction melting (VIM), electroslag remelting (ESR), continuous hot piercing, and high-precision multi-roll cold rolling/drawing lines. Backed by an industry-leading 1,200 tons monthly production capacity, DLX guarantees steady bulk supply, flexible manufacturing scheduling, and on-time shipment for global capital projects and recurring plant maintenance contracts.

Full-Chain Closed-Loop Quality Control and Non-Destructive Testing

From raw electrolytic nickel and high-purity chromium selection to final mechanical tensile verification and spectral chemical confirmation, every production stage follows strict closed-loop internal quality monitoring. Complete material test reports (MTR) with verified heat-specific chemical and mechanical data accompany every export crate.

Custom Precision Tube Cutting, Bending, and Export Packaging

DLX provides customized post-processing services, including precision fixed-length cutting ( $\pm 1 mm$ ), seamless U-tube bending with controlled thinning ratios, tube-end deburring, and protective end capping. All tubes are bundled with heavy-duty plastic sleeves and packed inside moisture-sealed, reinforced export wooden cases to ensure zero transit damage across maritime routes.

3bba44a7b1ce34b6e7edc97f2294e21a(767f9cf95e).png

Product FAQ

How Does High Temperature Oxidation Resistant Incoloy 800 Seamless Tube Resist Carburization at Elevated Temperatures?

High Temperature Oxidation Resistant Incoloy 800 Seamless Tube features a tightly balanced chemical synergy of 30-35% nickel and 19-23% chromium. In high-temperature hydrocarbon or carbon-rich atmospheres, the chromium immediately reacts with ambient oxygen to generate an impermeable chromia ( ${Cr}_{2} O_{3}$ ) surface film. The elevated nickel content stabilizes the austenitic lattice and significantly lowers carbon solubility within the alloy, preventing carbon penetration, carbide formation along grain boundaries, and high-temperature embrittlement.

What Are the Critical Dimensional Tolerances and Testing Protocols for Steam Heat Exchanger Tubing?

DLX executes multi-stage cold drawing and precise sizing passes to ensure outer diameter tolerances within $\pm 0.05 mm$ and wall thickness variations below 7.5%. Testing protocols include 100% in-line automated eddy current inspection, full-length ultrasonic flaw mapping, hydrostatic testing (up to $20 MPa$ based on tube geometry), flattening and flaring mechanical tests, and intergranular corrosion testing to confirm flawless metallurgical sound.

Why Is Incoloy 800 Preferred Over Standard Austenitic Stainless Steel for Superheater Tubes?

While standard austenitic stainless steels (such as 304 or 316) exhibit reduced creep strength and severe oxidation scaling above 550°C, High Temperature Oxidation Resistant Incoloy 800 Seamless Tube delivers high creep-rupture performance up to 800°C. Furthermore, its high nickel concentration virtually eliminates the risk of chloride-induced stress corrosion cracking in steam systems containing trace contaminants.

What Custom Tube Dimensions, Bending Radii, and Finishing Services Does DLX Provide?

DLX offers outer diameters from 12.7mm to 50.8mm, customized wall thicknesses from 0.8mm to 4.0mm, and continuous straight lengths up to 12 meters. We supply custom U-bent heat exchanger tubes engineered to exact radius specifications, complete with local bending zone stress-relief annealing, protective end caps, and custom-labeled export packaging tailored for engineering contractors and fabricators worldwide.

7(f24f28ab9a).jpg 8(49e9c8c3d9).jpg