Incoloy 028 Seamless Tube

UNS N08028 | 1.4563 | ASTM B668

Incoloy 028 Seamless Tube (N08028 / 1.4563) is manufactured to ASTM B668 from tube billet, cold-drawn to the required outside diameter and wall thickness. Supplied from our Wenzhou mill with EN 10204 3.1 mill test certificate, PMI and dimensional inspection on request.

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Incoloy 028 Product Overview and Advantages

SeamlessIncoloy N08028 Tube(also called seamless alloy 28 tubes), commonly referred to as Alloy 28 or Sanicro 28, is a high-alloy austenitic stainless steel and nickel alloytube engineered for extremely corrosive environments involving strong mineral acids and high-chloride media.

Unlike welded pipes, seamless Alloy 28 tubes are produced from a single solid billet using hot extrusion and precision cold drawing, creating a continuous metallurgical structure without weld seams. This seamless construction eliminates the risk of preferential corrosion along weld lines, ensuring superior reliability in critical chemical and petrochemical systems.

With a carefully balanced composition of Chromium (Cr), Nickel (Ni), Molybdenum (Mo), and Copper (Cu), UNS N08028 tubing bridges the performance gap between standard austenitic stainless steels (such as 316Lor904L) and more expensive high-nickel superalloys.

It is widely recognized for its excellent resistance to stress corrosion cracking (SCC), pitting corrosion, and aggressive acid attack.

Technical Advantages of Seamless Alloy 28 Tubing

Seamless N08028 tubes offer an exceptional combination of corrosion resistance, structural integrity, and mechanical strength.

Item	Description
Outstanding Resistance to Mineral Acids	Alloy 28 provides excellent corrosion resistance in highly aggressive environments including: Phosphoric acid (H₃PO₄) Sulfuric acid (H₂SO₄) Nitric acid processing systems This makes the alloy particularly suitable for fertilizer production and chemical processing plants.

Item

Description

Outstanding Resistance to Mineral Acids

Alloy 28 provides excellent corrosion resistance in highly aggressive environments including:

Phosphoric acid (H₃PO₄)
Sulfuric acid (H₂SO₄)
Nitric acid processing systems

This makes the alloy particularly suitable for fertilizer production and chemical processing plants.

High Pitting Resistance (PREN ≥ 38)

The elevated Chromium and Molybdenum content significantly increases the Pitting Resistance Equivalent Number (PREN ≥ 38), ensuring reliable protection against pitting and crevice corrosion in chloride-rich environments.

Excellent Resistance to Stress Corrosion Cracking (SCC)

The high nickel content (approximately 31%) provides strong resistance to chloride-induced stress corrosion cracking, outperforming many standard 300-series stainless steels.

Item	Description
Seamless Pressure Integrity	The weld-free seamless construction guarantees: uniform wall thickness improved mechanical reliability higher allowable working pressure in critical fluid handling systems.

Item

Description

Seamless Pressure Integrity

The weld-free seamless construction guarantees:

uniform wall thickness
improved mechanical reliability
higher allowable working pressure

in critical fluid handling systems.

Good Fabricability and Weldability

Despite its high alloy content, Alloy 28 tubing maintains excellent ductility and formability, allowing standard fabrication processes such as bending, flaring, and welding.

Incoloy 028 Product Specifications and Data

To provide a comprehensive overview of this high-performance material, here are the detailed technical specifications and performance data for Nickel Alloy Steel UNS N08120.

The composition of UNS N08120 is carefully balanced to achieve its superior corrosion resistance and high strength.

Chemical Composition of UNS N08028

Grade	C	Si	Mn	P	S	Cr	Ni	Cu	Mo	Fe
Seamless Incoloy N0	≤0.03	≤1.00	≤2.50	≤0.03	≤0.03	26.00-28.00	30.00-34.00	0.60-1.40	3.00-4.00	Bal

UNS N08028 is specifically designed to maintain its strength and shape in high-stress, corrosive environments.

Typical Mechanical Properties of UNS N08028

Tensile Strength	Yield Strength	Elongation	Hardness
≥ 580 MPa	≥ 214 MPa	≥ 40%	70-90HRB

Industrial Applications of UNS N08028 Seamless Tubes

Due to its superior corrosion resistance in acidic and chloride-containing environments, Alloy 28 seamless tubing is widely used in the following industries:

Item	Details
Fertilizer Industry	Heat exchanger tubesin phosphoric acid evaporation systems Handling of phosphate rock slurries
Oil & Gas (Sour Service)	Downhole tubing and liners for HPHT wells Applications involving H₂S and CO₂ corrosion

Item	Details
Chemical Processing	Equipment for sulfuric acid (H₂SO₄) production Nitric acid and organic acid processing plants
Hydrometallurgy	Ore leaching pipelines Acid recovery and regeneration systems
Environmental & Pollution Control	Flue Gas Desulfurization (FGD) systems Wet scrubbers and corrosion-resistant piping

Incoloy 028 Quality Assurance & Testing Standards

To ensure reliability in severe service environments, UNS N08028 seamless tubes undergo comprehensive inspection and certification procedures:

Production Standards: ASTM B668, ASTM A213, ASME SB668
Material Certification: EN 10204 3.1 / 3.2 MTC
Positive Material Identification (PMI): 100% alloy verification
Mechanical Testing: Tensile strength, yield strength, hardness, flattening, flaring, and bend tests
Corrosion Testing: Intergranular corrosion (IGC) and pitting corrosion testing according to ASTM G48
Non-Destructive Testing: 100% Eddy Current Testing (ET), Ultrasonic Testing (UT), and hydrostatic pressure testing

Alloy 28 (UNS N08028) vs 904L Stainless Steel

Feature	904L (UNS N08904)	Alloy 28 (UNS N08028)
Chromium (Cr)	19 – 23%	26 – 28% (Higher)
Nickel (Ni)	23 – 28%	30 – 32% (Higher)
PREN Value	~34	≥38 (Superior pitting resistance)
Acid Resistance	Good for dilute H₂SO₄	Excellent for concentrated H₃PO₄

Frequently Asked Questions About Incoloy 028 Seamless Tubes

What is Incoloy 028 Seamless Tube?

Seamless Incoloy N08028 Tube(also called seamless alloy 28 tubes) , commonly referred to as Alloy 28 or Sanicro 28 , is a high-alloy austenitic stainless steel and nickel alloy tube engineered for extremely corrosive environments involving strong mineral acids and high-chloride media .

Which standards does Incoloy 028 Seamless Tube comply with?

Incoloy 028 Seamless Tube is produced to ASTM B668, ASTM A213, ASME SB668.

Request a Incoloy 028 Tube Quotation

Send us your specification for Seamless Incoloy N0 seamless tube — OD, wall thickness, standard and quantity — and our engineering team will reply with a quotation within 24 hours.