Alloyed Aluminum-Silicon Coated Steel

Characteristics

Use

• Features a standard 90Al-10Si coating processed via dedicated thermal diffusion treatment. A continuous Fe-Al-Si alloy interlayer develops between the steel substrate and outer aluminium-rich coating, delivering consistent chemical composition and low impurity levels.

• Boasts excellent resistance to high-temperature oxidation and thermal cycling. It withstands prolonged high-temperature service and short peak temperature exposure without coating cracking, blistering or delamination.

• Forms strong metallurgical adhesion with the steel substrate, providing outstanding bending and deep drawability. The coating remains intact without peeling during complex stamping processes.

• Is compatible with all mainstream welding methods, minimising welding spatter, defects and electrode abrasion. Direct welding is achievable without full pre-stripping of the coating, ensuring consistent mechanical strength of welded joints.

• Exhibits excellent infrared radiation performance after prolonged high-temperature oxidationheating equipment components.

• Automotive Industry

• Household Appliance & Kitchen Equipment

• Industrial Heating & HVAC Equipment

• New Energy & Thermal Power Equipment

• Construction & Fire Protection

Coating weight symbol

KSD3544

JISG3314

ASTMA463

DINEN10346

GB/T18592

120

一

120

T1-40(120)

AS 120

AS 120

Classification

Technical Parameter Description

Coating Composition

Nominal coating ratio: 90 wt.% aluminium, 10 wt.% silicon; regular total coating weight of 120 g/m² on both sides; zinc impurity ≤0.05 wt.%

Metallurgical Structure

Three-layer composite structure; the intermediate continuous Fe-Al-Si alloy interlayer is strictly controlled within 8–12 μm without discontinuity

High Temperature Resistance

Stable long-term service at 600℃; withstand short peak temperature of 650℃ for maximum 2 hours; oxidation mass gain ≤0.35 mg/cm² after 1000-hour isothermal test at 600℃

Formability & Adhesion

Critical scratch delamination load ≥18 N; no coating peeling after 0T tight T-bend test; Grade 0 in ISO 2409 cross-cut adhesion test

Infrared Optical Property

Total normal emissivity ranges from 0.78 to 0.86 after high-temperature oxidation