Aluminized (AS) Steel: The High-Heat & Corrosion Solution for Automotive Exhaust & Pipeline Insulation

Created on 09.26
When it comes to high-temperature operating environments and long-term atmospheric corrosion protection, few materials deliver the balance of performance and cost-effectiveness of hot-dip aluminized (AS) steel. As a top 3 aluminized steel producer in China, CNB New Material offers a full range of Type 1 and Type 2 aluminized steel coils, sheets and pipes engineered for automotive exhaust systems, pipeline insulation cladding and industrial thermal equipment.

What Makes Aluminized Steel Stand Out

Aluminized steel (also called aluminium-coated steel) combines the strength and formability of a steel base with the oxidation resistance and corrosion protection of an aluminum-silicon alloy coating. The coating is metallurgically bonded to the substrate, creating a permanent barrier that will not peel or delaminate under thermal cycling.
Aluminized steel coating structure cross-section - steel base, intermetallic bonding layer and Al-Si alloy coating
Key performance advantages:
Exceptional high-temperature resistance: Stable performance at continuous operating temperatures up to 600°C, and short-term heat resistance up to 800°C. Far outperforms galvanized steel in heat-exposed applications.
Strong atmospheric corrosion protection: The aluminum-rich surface forms a dense, self-healing aluminum oxide layer, delivering long-term durability in outdoor, humid and lightly industrial environments.
Excellent thermal reflectivity: High solar and thermal reflectance reduces surface temperature, making it ideal for insulation jacketing and heat shield applications.
Good formability & weldability: Compatible with roll forming, bending, stamping and various welding processes, supporting complex part manufacturing.

Two Grades for Targeted Applications

We supply two primary types of aluminized steel to match different operating environments:
Type
Coating Structure
Core Strength
Primary Applications
Type 1 (Al-Si Alloy Coating)
Aluminum-silicon alloy layer with intermetallic bonding layer
High-temperature oxidation resistance, thermal stability
Automotive mufflers, exhaust pipes, heat shields, industrial furnace components
Type 2 (Aluminum-Rich Coating)
Higher aluminum content outer layer
Superior atmospheric corrosion resistance, weatherability
Pipeline insulation cladding, roofing, wall panels, outdoor ductwork

Spotlight: AS Steel for Automotive Exhaust Systems

For automotive exhaust components (mufflers, end caps, baffles and exhaust pipes), Type 1 aluminized steel is the industry standard material. CNB’s DX53D+AS120 grade offers deep-drawing formability for complex shapes and strong corrosion resistance against condensate, road salt and exhaust heat — proven to extend component service life by 2–3 times versus bare steel and standard galvanized alternatives.
Type 1 aluminized steel automotive exhaust system - muffler, exhaust pipes and heat shield components

Spotlight: AS Steel for Pipeline Insulation Cladding

For oil & gas pipeline and district heating pipe insulation projects, Type 2 aluminized steel (typically DX51D AS80–AS300) serves as the outer protective jacket. It shields insulation layers from weather impact, UV radiation and mechanical damage while reflecting heat to improve insulation efficiency. Our AS steel passes over 4,000 hours of salt spray testing, ensuring long-term outdoor durability.
Type 2 aluminized steel pipeline insulation cladding jacket on district heating and oil and gas pipelines

CNB Supply Advantages

  • Full specification range: Thickness 0.3–3.0mm, width 900–1600mm, coating mass AS80–AS400 g/m². We are among the first Chinese manufacturers to achieve stable mass production of 400g/m² heavy aluminized coating.
  • Pipe & tube capability: We manufacture large-diameter aluminized steel pipes over 330mm, a rare capability in the market, for exhaust and pipeline applications.
  • Reliable stock & delivery: 2,000 tons of daily ready stock of aluminized steel coils and sheets, with standard specifications shippable within 7 days.
  • Quality assurance: ISO, SGS and BV certified production, with full MTC provided for every order. Third-party salt spray test reports available upon request.
Whether you are sourcing for automotive exhaust manufacturing, pipeline insulation projects or industrial thermal equipment, CNB New Material provides tailored aluminized steel solutions to match your performance and cost targets.
👉 Request a free sample, review our technical data sheet or get a competitive quotation for your aluminized steel requirements.
Contact
Leave your information and we will contact you.
电话
WhatsApp