SHANGHAI RUICHAO INDUSTRIAL
SHANGHAI RUICHAO INDUSTRIAL
Pickled SPHE is an acid-treated, extra deep drawing-grade hot-rolled steel engineered for the most demanding forming processes. After pickling to remove surface scale and impurities, it delivers exceptional ductility, superior surface quality, and high dimensional consistency—making it especially suited for severe deep drawing, stretching, and complex pressing operations where failure risks must be minimized. It is widely used in high-end applications such as automotive exterior body panels, premium appliance surfaces, electronics enclosures, and precision mechanical components, where flawless formability, aesthetic appearance, and structural reliability are essential.
Specification Parameters
| Parameters of Pickled SPHE Steel | |||
| Parameter Category | Specific Parameter | Typical Value / Description | Importance / Effect |
| Base Metal Standard | JIS Grade | SPHE (Cold-rolled Extra Deep Drawing Quality) | Defines the final target grade. The pickled hot-band is produced to meet the chemical requirements for this standard. |
| Chemical Composition (Key Parameter) | Carbon (C) | Very Low: 0.02% - 0.06% | The single most important parameter. Minimized to achieve extreme softness and eliminate aging, ensuring maximum formability. |
| Manganese (Mn) | 0.20% - 0.40% | Kept low to maintain softness and good formability. | |
| Phosphorus (P) | ≤ 0.030% | An impurity; kept low to prevent embrittlement. | |
| Sulfur (S) | ≤ 0.030% | An impurity; kept very low to prevent forming MnS inclusions which harm formability. | |
| Aluminum (Al) | 0.02% - 0.07% | Used as a killing agent to remove oxygen (deoxidize the steel), resulting in a "Aluminum-Killed" (AK) steel. This is essential for deep drawing quality. | |
| Mechanical Properties (Hot-Rolled Pickled State) | Yield Strength (YS) | Relatively low (e.g., 260 - 320 MPa) | Must be soft enough to be easily cold-rolled to the desired final thickness. |
| Tensile Strength (TS) | Relatively low (e.g., 370 - 440 MPa) | Indicates the base metal is in a soft, formable state before cold reduction. | |
| Elongation | High (> 30%) | Necessary to withstand the significant deformation of the cold-rolling process without tearing. | |
| Surface & Dimensional | Surface Quality | Clean, scale-free, uniform matte finish. | The entire purpose of pickling. Removes all mill scale to ensure a flawless surface after cold rolling. Any defects here will carry through to the final product. |
| Thickness (Hot-Rolled Pickled) | 1.5mm - 4.0mm (common range) | This is the starting thickness that will be cold-reduced to a final, thinner gauge (e.g., 0.5mm - 1.5mm). | |
| Key Characteristics | Formability (Potential) | Excellent / Extra Deep Drawing | The chemical composition is tailored so that after cold rolling and annealing, the final product will have exceptional ductility (Elongation >40%) and low yield strength for severe forming like deep drawing, stretching, and ironing. |
| Non-Aging | Stable mechanical properties over time. | The ultra-low carbon content prevents the gradual increase in strength and loss of ductility that can occur in lower-quality steels. | |
