Specializing in the production of various stainless steel pipes, plates, coils, rods, pipe fittings, high nickel alloy steel products, high temperature resistant products
PRODUCTS
Aluminized Tube
Category:
Aluminized Tube
keywords :
Aluminized Tube
Product Description
Produced by hot-dip aluminizing of carbon or alloy steel tube, forming a continuous, intermetallic aluminum-iron alloy layer with an outer pure aluminum coating. Features excellent resistance to high-temperature oxidation, good corrosion resistance in sulfur-containing and high-temperature environments, and improved heat reflectivity. Available base tube materials: carbon steel (20#, Q235B, Q355B, ST35.8, ST45.8), alloy steel (15CrMo, 12Cr1MoV). Tube outer diameter: 16mm – 219mm. Wall thickness: 1.5mm – 12mm. Length: 3m – 12m (custom). Coating thickness: 30µm – 120µm (pure aluminum outer layer + alloy layer). Surface finish: silver-gray (as-coated), smooth, uniform. Coating composition: outer layer ≥99% Al, intermetallic layer Fe-Al (Fe3Al, FeAl). Service temperature: up to 800°C (oxidation resistance), 550°C (corrosion resistance). Excellent resistance to sulfur attack and carburization. Meets ASTM A795, EN 10346, or GB/T 12415 standards. Custom diameters, lengths, and coating thickness available.
Parameter
|
Product Name |
Aluminum Coated Steel Tube / Aluminized Steel Tube |
|
Base Tube Materials |
Carbon steel (20#, Q235B, Q355B, ST35.8, ST45.8), alloy steel (15CrMo, 12Cr1MoV) |
|
Coating Process |
Hot-dip aluminizing (batch or continuous) |
|
Coating Composition |
Outer layer: pure aluminum (≥99% Al); inner layer: Fe-Al intermetallic (Fe₃Al, FeAl) |
|
Total Coating Thickness |
30µm – 120µm (typical 50–80µm) |
|
Outer Diameter (Tube OD) |
16mm – 219mm (custom up to 500mm) |
|
Wall Thickness |
1.5mm – 12mm (depending on diameter and application) |
|
Standard Length |
3m – 6m (custom up to 12m) |
|
Surface Finish |
Silver-gray, smooth, uniform (as-coated) |
|
Service Temperature – Oxidation |
Up to 800°C (intermittent), 700°C (continuous) |
|
Service Temperature – Corrosion |
Up to 550°C in sulfur-bearing atmospheres |
|
Melting Point of Coating |
~660°C |
|
Corrosion Resistance |
Excellent resistance to sulfidation, carburization, and high-temperature oxidation; good resistance to CO, H₂S, SO₂ |
|
Heat Reflectivity |
High (aluminum surface reflects radiant heat) |
|
Coating Adhesion |
Metallurgical bond, no spalling under thermal cycling |
|
End Preparation |
Plain ends, beveled, or threaded (coating removed on threaded portion if required) |
|
Standards Compliance |
ASTM A795 (aluminized steel pipe), EN 10346, GB/T 12415, or customer specification |
|
Applications |
Heat exchangers (boilers, economizers, air preheaters), furnace tubes, exhaust systems, refinery heaters, waste heat recovery units, flue gas desulfurization systems |
Application description:
Widely used in high-temperature heat exchangers (boilers, economizers, air preheaters), refinery heaters, furnace tubes, exhaust systems, waste heat recovery units, and flue gas desulfurization systems. Also suitable for carbon black production, chemical processing, and marine exhaust piping where resistance to sulfidation, carburization, and high-temperature oxidation is critical. The aluminized coating significantly extends tube life in aggressive, high-temperature environments.
Production description
Carbon/alloy steel tube is degreased, pickled, and fluxed, then immersed in molten aluminum bath (680–720°C). The aluminum reacts with the steel surface to form an intermetallic Fe-Al layer, topped with a pure aluminum coating. The tube is withdrawn, cooled, and inspected for coating thickness and adhesion.
Shipping Packaging
For export, aluminized tubes are bundled with wooden separators, wrapped with VCI paper and moisture-proof polyethylene, packed on ISPM-15 pallets, secured with steel straps, and fitted with plastic end caps. Labels include base material, coating thickness, dimensions, and heat number for safe sea freight.
Why Choose Us?
1.Factory Strength:Direct manufacturer with continuous or batch hot-dip aluminizing lines, capable of coating carbon/alloy steel tubes (OD 16–219mm, wall 1.5–12mm) with uniform Fe-Al intermetallic + pure aluminum coating (30–120µm).
2.Quality Assurance:Strict control of coating thickness, adhesion (metallurgical bond), high-temperature oxidation resistance (tested up to 800°C), and corrosion resistance in sulfur/carburizing environments; 100% coating integrity inspection (porosity-free); compliant with ASTM A795, EN 10346, GB/T 12415.
3.Certifications & Reports:Mill test certificates (MTC) for base tube and coating with each shipment; third-party inspections (SGS, BV) and salt spray/high-temperature cyclic oxidation test reports available upon request.
4.Customization & Service:Wide range of base tube materials (carbon steel 20#, Q235B, Q355B, ST35.8; alloy steel 15CrMo, 12Cr1MoV), custom diameters (16–219mm), lengths (3–12m), coating thickness (30–120µm), and end preparation (plain, beveled, or threaded) with fast lead times.
5.Export Packaging:Wooden separators + VCI paper + moisture-proof polyethylene + ISPM-15 pallets + steel strapping + plastic end caps + clear labeling for safe sea freight and coating protection.
FAQ
1. How to store aluminized tubes to prevent coating damage and white rust?
Store in dry, clean indoor area on wooden pallets or racks, keep original moisture-proof wrapping intact. Avoid contact with wet ground, acids, or chlorides. For long-term storage, maintain humidity below 60%. Minor scratches on the pure aluminum outer layer do not affect high-temperature oxidation resistance, but deep scratches exposing steel should be repaired with aluminum-rich paint. Do not stack heavy loads that could deform the tube.
2. What is the maximum service temperature of aluminized tubes, and how does it compare to stainless steel?
Aluminized tubes can be used continuously at 700°C (intermittent up to 800°C) in oxidizing and sulfur-containing atmospheres. Above 800°C, the aluminum coating melts and diffuses rapidly. Compared to 304 stainless steel, aluminized carbon steel offers similar oxidation resistance up to 700°C but at much lower cost. For service above 700°C or highly corrosive chloride environments, stainless steel (316L) is recommended. Aluminized tubes excel in sulfidation and carburization resistance, often outperforming stainless steel in refinery and boiler applications.
3. Can aluminized tubes be welded? If so, what precautions are needed?
Yes. Welding removes the aluminum coating in the heat-affected zone, exposing steel. Use TIG or low-hydrogen arc welding with stainless steel or nickel-based filler (e.g., ER309L or ERNiCr-3). Remove coating at least 25mm from the weld area, weld, then apply aluminum-rich paint or thermal spray aluminum to restore corrosion protection on the weld and adjacent zones. For load-bearing welds, consult design codes. Avoid high heat input to minimize coating damage.
Customer Reviews
FACTORY APPEARANCE
HONORS AND QUALIFICATIONS
The company has sufficient inventory and complete varieties and specifications. Special materials and specifications are produced according to customer requirements and exported to Asia, the Middle East, Europe and other countries and regions. We have our own quality management systems: ISO9001, ISO14000, OHSAS18001 standards.
CUSTOMER VISIT
GET A FREE QUOTE
We understand that our customers value quality and after-sales service most. We consistently adhere to high standards and strict requirements, striving to become your preferred partner.
RELATED PRODUCTS
Get ln Touch Now
Need Assistance? We're Here To Help!
Telephones
Contact Address
Building 1, Wealth No.1 Plaza, Huaiyin District, Jinan City, Shandong Province, China
If you have any questions or need help, please feel free to contact us.
Enter your information and our team will reach out to you shortly.
Copyright : © NUCOR STEEL (SHANDONG) CO., LTD.
