SECC Tensile Strength
SECC (electrolytically chromate-coated steel) is a type of steel with an electrolytic zinc and chromate treatment on its surface. It offers corrosion resistance and paintability and is commonly used in the automotive and home appliance industries. Its tensile strength depends on the base steel type and coating process, and can generally be categorized as follows:
1. Standard SECC (based on SPCC/SECC substrates)
Tensile Strength: Approximately 270-440 MPa
(This range corresponds to the strength of standard cold-rolled SPCC steel. The zinc coating and chromate treatment have minimal impact on tensile strength.)
2. High-Strength SECC (e.g., high-tensile steel substrates)
Tensile Strength: 440-980 MPa or higher
(Using high-tensile steel substrates, such as high-strength galvanized steel for automotive applications, significantly increases tensile strength.)
3. Influencing Factors
Base material type: SPCC (standard cold-rolled steel), high-strength steel (such as bake-hardened steel, duplex steel, etc.) directly influences tensile strength.
Coating Thickness: Zinc coating and chromate treatment primarily affect corrosion resistance and have limited impact on tensile strength.
Work Hardening: Stamping or cold working may slightly increase strength, but be aware of decreased ductility.
4. Testing Standards
Tensile strength testing typically follows international standards (such as JIS G 3313 and ASTM A653) and is measured using a tensile testing machine.