MESCO Aluminized Steel – ASTM A463 T1/T2: Complete Specification & Supply Guide

Selecting the right aluminized steel grade and coating weight is critical for applications requiring heat reflection, corrosion resistance, and long service life. MESCO aluminized steel sheet (model ASTM A463 T1/T2) conforms to the ASTM A463 standard and is engineered for the automotive, HVAC, and exhaust industries. This guide covers the exact specifications, coating options, and supply advantages that make MESCO a trusted partner for global buyers.

What Are the Common Problems When Sourcing Aluminized Steel?

Buyers often face inconsistent coating quality, mismatched standards, long lead times, and limited availability of heavy-gauge coating weights. Without a clear understanding of ASTM A463 Type 1 vs. Type 2, project specifications can be easily misaligned, leading to field failures and cost overruns.

Industry Background: Why ASTM A463 Aluminized Steel Matters

Hot-dip aluminized steel combines the strength of carbon steel with the heat and corrosion resistance of an aluminum‑silicon coating. It is widely used in exhaust systems, HVAC heat exchangers, and industrial insulation jacketing. The ASTM A463 standard defines two types:

• Type 1 (T1) – Aluminized steel with an aluminum‑silicon coating (5–11% Si), optimized for heat resistance and high‑temperature applications.
• Type 2 (T2) – Aluminized steel with a pure aluminum coating, offering superior atmospheric corrosion resistance.

Note: In China, only Type 1 (T1) aluminized steel is produced; Type 2 (T2) must be sourced from overseas suppliers. MESCO is the leading domestic supplier of T1 material.

MESCO Aluminized Steel: The Complete Solution

MESCO aluminized steel conforms to ASTM A463 standard with model designation ASTM A463 T1/T2 (Type 1 only from Chinese production). The material is a carbon steel base metal with an Al‑Si coating. Available forms include aluminized steel coil, sheet, plate, and strip.

Key Parameters

Why MESCO Stands Out

• First supplier in China to offer aluminized steel with 240 g/m² coating, and the first to supply 300 g/m² – currently the exclusive company able to supply coating weights over 240 g/m².
• Maintains 4,000 tons daily stock covering nearly all grades, enabling delivery within 3–7 working days for standard specifications.
• Only supplier with AS120 ready stock coils.
• Salt spray test results exceed 4,000 hours, confirming excellent corrosion resistance.
• First company to supply aluminized steel pipes.
• Listed among the Top 3 aluminized steel manufacturers in China.

Step‑by‑Step Selection Guide

1. Determine operating temperature: ASTM A463 Type 1 is suitable for continuous service up to 650°C. For lower temperature outdoor exposure, consider Type 2 (if needed, MESCO can supply via overseas partners).
2. Select coating weight: Higher coating weights (AS240–AS300) provide longer corrosion life and are ideal for exhaust systems and heat exchangers. AS80/AS120 are cost‑effective for less demanding environments.
3. Choose thickness and width: MESCO offers 0.37–3.0 mm thickness and 600–1500 mm width to match your forming and structural needs.
4. Validate supply: MESCO’s large inventory ensures fast delivery; request a coating weight certification and salt spray test report.

Use Cases

• Automotive exhaust systems – Heat‑resistant Type 1 aluminized steel for mufflers, pipes, and heat shields.
• HVAC heat exchangers – Reflective coating improves thermal efficiency; AS240/AS300 grades resist condensation corrosion.
• Industrial refractory insulation – Aluminized steel jacketing protects insulation from moisture and high‑temperature degradation.

Comparison: Aluminized Steel Coating Weights

Frequently Asked Questions

Conclusion

MESCO aluminized steel delivers the exact ASTM A463 performance you need – from standard AS80 for light-duty applications to exclusive AS300 for the toughest environments. With a proven track record, 4,000+ hours salt spray performance, and the largest inventory in China, MESCO is the reliable partner for automotive, HVAC, and industrial projects worldwide.

Request the full MESCO steel catalog and sample specifications: Download MESCO STEEL CATALOGUE 2025.