JIS G3113 SAPH440 automotive structural steel

JIS G3113 SAPH440 automotive structural steel is widely used in automotive industry to process automotive frame, wheel and other automotive structural parts with high formability requirements.

Because the automobile industry has strict requirements for product quality, products are often treated by acid pickling, phosphating, electrophoresis, electroplating and other processes according to different processing requirements. Therefore, the surface quality of JIS G3113 SAPH440 automotive structural steel strip is very high. Any surface defects such as iron oxide scale indentation, pits, scratches and so on may cause unqualified final products after surface treatment, thus constituting a large economic loss.

By optimizing the schedule structure, improving the material quality of rolls, reducing the load on the front section of finishing mill and enhancing the cooling strength of rolls, the defects of oxide sheet on the surface of high strength pickling steel, represented by JIS G3113 SAPH440 automotive structural steel, can be effectively improved.

Strengthening tooling management and equipment function accuracy confirmation is one of the effective means to control iron oxide scale indentation defect of JIS G3113 SAPH440 automotive structural steel and improve surface quality of hot rolled coil.