Coated Steel Series · Hot-Dip Al-Si
Aluminized Silicon
Steel Sheet
MESCO's hot-dip aluminized silicon steel (Type 1 Al-Si) features a superior aluminum-silicon alloy coating that delivers outstanding heat resistance up to 700°C, excellent corrosion protection, and a clean metallic appearance. The standard material for automotive exhaust systems, heat exchangers, and high-temperature industrial applications.
AS40–AS300
Coating Weight Range
🏭China Factory Direct
🌡️Heat Resistance ≤ 750°C
📋ISO 9001 · IATF 16949
🔬EN 10204 3.1 MTR
📦MOQ 1 Metric Ton
🚢FOB / CIF / DDP
Product Structure
Al-Si Coating Structure
Aluminized silicon steel features a hot-dip applied aluminum-silicon alloy coating bonded to steel substrate via an intermetallic alloy layer. Understanding the structure helps specify the correct product.
Al-Si Coating Layer
Aluminum-Silicon (Al ~90%, Si ~8–11%)
Fe₂Al₅ Intermetallic Alloy Layer
Steel Substrate (DC01 / DC03 / HSLA)
Fe₂Al₅ Intermetallic Alloy Layer
Aluminum-Silicon (Al ~90%, Si ~8–11%)
15–50μm
3–5μm
Base
3–5μm
15–50μm
Why Silicon is Added
Pure aluminum coatings form thick, brittle Fe-Al intermetallic layers during hot-dip processing. Adding 8–11% silicon dramatically slows this reaction, producing a thinner, more ductile alloy layer that greatly improves formability and coating adhesion.
The silicon also lowers the melting point of the coating bath (~577°C vs 660°C for pure Al), enabling better process control and smoother, more uniform coatings.
Silicon content: 8–11% by weight in coating
Total coating thickness: typically 20–60 μm per side
Intermetallic layer: Fe₂Al₅ + FeAl₃ (thin, hard)
Both sides coated (Type 1) unless specified
Full Product Range
Browse by Category
MESCO's aluminized silicon steel range is classified across four dimensions — select the most relevant classification for your application.
Coating Weight · Light
AS40 — Light Coat
Light Coating Aluminized Steel · 40 g/m²
Minimum 40 g/m² total both sides. Thinnest coating option offering basic heat and corrosion protection. Preferred for forming-intensive applications where coating flexibility is critical.
40 g/m² min.~10μm/sideBest formabilityUp to 500°C
Coating Weight · Standard ★
AS80 — Standard Coat
Standard Coating Aluminized Steel · 80 g/m²
The most widely specified coating weight. 80 g/m² total both sides (~20μm per side). Optimal balance of corrosion protection, heat resistance, and formability. Industry default for automotive exhaust and HVAC components.
80 g/m² min.~20μm/sideMost popularUp to 650°C
Coating Weight · Heavy
AS120 — Heavy Coat
Heavy Coating Aluminized Steel · 120 g/m²
120 g/m² total (~30μm per side). Enhanced corrosion protection for demanding outdoor or moderately corrosive environments. Suitable for building roofing, cladding, and heat exchanger shells.
120 g/m² min.~30μm/sideEnhanced corrosionUp to 700°C
Coating Weight · Extra Heavy
AS150 / AS200 — Extra Heavy
Extra Heavy Coating Aluminized Steel · 150–200 g/m²
Maximum corrosion and heat protection. 150–200 g/m² coating weight (~40–50μm per side). Specified for the most demanding high-temperature industrial environments, mufflers, and catalytic converter substrates.
150–200 g/m²~40–50μm/sideMax protectionUp to 700°C+
Substrate · Commercial Quality
DC01 Substrate
DC01 Substrate · Commercial Grade Cold Rolled Steel
Commercial-quality cold-rolled steel base. Good surface quality, standard formability. The most economical substrate option. Suitable for general fabrication, non-structural cladding, and HVAC ducting.
EN 10130 DC01Yield ≥ 280 MPaEconomy
Substrate · Deep Drawing
DC03 / DC04 Substrate
DC03/DC04 Substrate · Deep Drawing Grade
Deep-drawing quality substrate with improved ductility and r-value. Specifically designed for complex forming, deep-drawn exhaust components, and automotive stamped parts requiring significant material deformation.
EN 10130 DC03/04r-value ≥ 1.3Deep draw
Substrate · High Strength
HSLA High-Strength Substrate
HSLA Steel Substrate · High Strength Low Alloy
High-strength low-alloy steel substrate providing superior strength-to-weight ratio. Enables thinner gauge use while maintaining structural performance. Common in lightweight automotive structures and load-bearing panels.
Yield 340–550 MPaS220GD / S280GDLightweight
Substrate · Ferritic SS
409L Ferritic SS Substrate
409L Stainless Steel Substrate · Ferritic Stainless Steel
Ferritic stainless steel substrate (11% Cr, titanium-stabilized) combined with Al-Si coating for maximum high-temperature performance. Premium specification for catalytic converters, mufflers, and 700°C+ exhaust systems.
11% Cr substrateTi-stabilized700°C+ service
Substrate · Interstitial Free
IF Steel Substrate
IF Ultra Deep Drawing Steel Substrate · Interstitial-Free Steel (IF)
Interstitial-free (IF) steel offers the highest formability with excellent surface quality. Used where extreme deep drawing, stretch forming, or post-forming paint/coating adhesion is required.
Ultra-deep drawr-value ≥ 1.8Top surface quality
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Application · Automotive
Automotive Exhaust Systems
Automotive Exhaust Systems · Mufflers / Exhaust Pipes
Mufflers, catalytic converter housings, exhaust pipes, heat shields, and manifold components. Service temperatures typically 400–700°C with thermal cycling. Requires excellent formability and weldability.
AS80 / AS150DC03 / 409L0.5–2.0mm400–700°C
🔥
Application · Thermal
Heat Exchangers & Furnaces
Heat Exchangers · Industrial Furnaces
Shell-and-tube heat exchangers, air pre-heaters, furnace linings, dryer drums, and industrial heating equipment. Requires consistent performance under sustained high-temperature exposure and thermal cycling.
AS120 / AS150DC01 / HSLA0.8–3.0mm500–700°C
🏠
Application · Building
Roofing, Cladding & HVAC
Building Roofing · Wall Panels · Ventilation Ducts
Metal roofing, wall cladding, chimney flues, HVAC ducting, and flashing. Al-Si coating provides superior weather resistance and heat reflection. Excellent alternative to galvanized in high-temperature environments like flue gas exhaust.
AS80 / AS120DC01 / S220GD0.3–1.5mmOutdoor / Corrosion
🍳
Application · Appliances
Ovens, Ranges & Appliances
Ovens · Stoves · Appliance Liners
Oven liners, baking trays, range tops, dishwasher components, and dryer drums. Requires food-safe coating that withstands oven temperatures (200–450°C), cleaning agents, and humid environments.
AS40 / AS80DC03 / IF0.4–1.2mm200–450°C
⚡
Application · Energy
Solar Thermal & Energy Systems
Solar Thermal Applications · Energy Equipment
Solar thermal collector tubes and plates, heat pump components, power plant flue linings, and biomass boiler parts. High solar reflectivity (Al-Si ≥ 85%) and sustained heat resistance are key requirements.
AS80 / AS120DC01 / HSLA0.5–2.0mmSolar reflective
⚙️
Application · Industrial
General Industrial & Process
General Industry · Process Equipment
Incinerator linings, cement kiln components, petrochemical insulation jacketing, agricultural dryers, and general heat-shielding applications. Flexible specification to meet a wide range of industrial requirements.
AS80 – AS200DC01 / HSLA / 409L0.5–3.0mmCustom spec
Thickness · Ultra-Thin
Ultra-Thin: 0.2–0.8 mm
Ultra-Thin Gauge · 0.2–0.8 mm
Designed for deep-drawing, roll-forming, and precision stamping applications. Requires highest substrate quality (IF or DC04) and tightest coating thickness control. Used in oven liners, appliance parts, and thin heat shields.
0.2 – 0.8 mmIF · DC03 · DC04AS40 · AS80Deep draw
Thickness · Standard ★
Standard: 0.8–1.5 mm
Standard Gauge · 0.8–1.5 mm
The most common thickness range for automotive exhaust, HVAC, and general fabrication. Good balance of formability and structural rigidity. Stocked as coil in DC01, DC03, and AS80 as standard.
0.8 – 1.5 mmDC01 · DC03 · HSLAAS80 · AS120Most stocked
Thickness · Medium-Heavy
Medium-Heavy: 1.5–2.5 mm
Medium Gauge · 1.5–2.5 mm
For structural panels, heat exchanger shells, thicker exhaust components, and load-bearing applications. Reduced formability compared to thinner gauges. Roll-forming and press brake bending are the primary fabrication methods.
1.5 – 2.5 mmDC01 · HSLA · 409LAS80 · AS150Structural
Thickness · Heavy
Heavy Gauge: 2.5–4.0 mm
Heavy Gauge · 2.5–4.0 mm
Heavy-gauge aluminized silicon for industrial furnace components, thick heat shields, flue gas ductwork, and industrial incinerator panels. Limited formability — primarily for simple bends, welded assemblies, and flat panel applications.
2.5 – 4.0 mmDC01 · HSLAAS120 · AS200Industrial
Quick Selection Guide
Specification Selection Matrix
Use this matrix to quickly identify the recommended specification for your application. Contact us for applications not listed.
| Application | Recommended Grade | Coating Weight | Thickness | Max Temp | Key Requirement |
|---|
| Automotive Muffler | DC03 or 409L | AS80 / AS150 | 0.8–1.5 mm | 650°C | Formability + Heat |
| Catalytic Converter Housing | 409L | AS150 / AS200 | 1.0–2.0 mm | 700°C+ | Max Heat Resistance |
| Exhaust Heat Shield | DC01 / DC03 | AS40 / AS80 | 0.5–1.0 mm | 500°C | Lightweight + Form |
| HVAC Ducting | DC01 | AS80 | 0.5–1.2 mm | 300°C | Corrosion + Economy |
| Oven Liner / Baking Tray | DC03 / IF | AS40 / AS80 | 0.4–0.8 mm | 450°C | Deep Draw + Hygiene |
| Heat Exchanger Shell | DC01 / HSLA | AS120 | 1.0–3.0 mm | 600°C | Sustained Heat |
| Metal Roofing / Cladding | S220GD / DC01 | AS120 / AS150 | 0.4–1.0 mm | 200°C | Weather Resistance |
| Industrial Furnace Lining | HSLA / 409L | AS150 / AS200 | 2.0–4.0 mm | 700°C+ | Structural + Heat |
| Chimney / Flue Lining | DC01 / HSLA | AS80 / AS120 | 0.8–2.0 mm | 500°C | Corrosion + Heat |
| Solar Thermal Collector | DC01 | AS80 | 0.5–1.0 mm | 300°C | High Reflectivity |
Why MESCO
Your Trusted Al-Si Steel Source
20+ years manufacturing experience, competitive factory pricing, and quality certification for the most demanding end markets.
🌡️Full Coating Weight Range
AS40 through AS200 stocked or produced to order. Single-side and differential coating available on request.
AS40 · AS80 · AS120 · AS150 · AS200 🚗IATF 16949 Automotive
Automotive quality management system certification for exhaust and heat management component supply chains.
IATF 16949 Certified 🔬Full Lab Testing
Coating weight (triple-spot), adhesion, salt spray, heat resistance cycling, and mechanical testing for every batch.
EN 10204 3.1 MTR 🏭Custom Slit & CTL
Custom slit widths from 20mm, cut-to-length sheet, and coil-to-sheet conversion from our own slitting lines.
±0.1mm slit tolerance