When it comes to the home appliance and automotive industries, surface quality ranks among the most important factors that determine the value of a cold rolled steel coil. With over 15 years of experience, China Rarlon Group Limited a professional steel supplier has put in place a very stringent system of cold rolled steel coil surface quality control to meet the global customers high demands. The following sections outline practical measures to achieve surface quality.    

Foundation Quality Raw Material Inspection.  

Foundation quality cold rolled steel coil begins with quality raw materials. Rarlon performs detailed assessment of surface quality of hot rolled steel coils the raw material for cold rolling prior to production. Inspectors look for surface diisruptions, cracks, spots of rust, and inclusions in the raw coils. If all the checks are passed the raw material proceeds to cold rolling. This initial check will be central to cold rolled steel coil surface quality control as all defects in the raw material will be amplified in the rolling processes.

Steel Coil Cold Rolling Quality Control

Cold rolled steel coil surface quality control focuses on minimizing surface imperfections. Rarlon has invested in advanced rolling equipment and has configured process parameters with precision. Defects such as surface scratches develop if rolling speed varies as uneven pressure is applied to the coil. The condition of rolling mill rollers is also critical; they must be maintained in order to avoid roller marks on the steel coil. For these reasons, consistent and effective control of process parameters has surface quality control as the primary goal.

Detergent application and Residue Extraction cleaning

Stripped cold rolled coils periodically covers operators work area and performing cleaning operations protects operators working area. Nonetheless Rarlon performs an extra thorough multi step cleaning process which is alkali washing, water rinsing and drying. Rarlon removes oil residues and loose iron filings by performing alkali washing and high pressure water rinsing. Rarlon also performs drying after cleaning to prevent drying water spots. Recommended cleaning improves the coils appearance and also increases the adhesion of laying coatings. Recommended cleaning is invaluable to cold rolled steel coils surface quality control, especially for painted home appliance shell coils.

Strict Process Control Does Not Eliminate the Need for Post Production Inspection  

Having the quality control staff conduct post production inspection on cold rolled steel coil surfaces adds another layer to achieving quality control. Defects such as scratches, dents, or discolorations are easily visible and identified during visual inspections; however, less obvious defects require more refined equipment such as a surface flaw detector to identify inclusions and pinholes. Any coil failing the test gets reworked or removed. This guarantees only post production inspected cold rolled steel coils with flawless surface quality exit the factory. This is a hallmark of cold rolled steel coil surface quality control.

Consistent Steel Quality Starts with Equipment Upkeep

For uniform surface quality on cold-rolled steel coils, having uninterrupted and predictable equipment operations is crucial. Rarlon puts together a cold-rolling equipment upkeep plan that includes routine maintenance. This involves assessing rolling mill parts and detection devices to determine whether parts need repair or replacement. Regularly Scheduled Maintenance involves bearing replacement to minimize equipment induced surface waviness defects on coils. Regular maintenance is a big contributor to predictable and stable processes, and that is what Maintenance Balance provides on Quality Control Surfaces on Cold Rolled Steel Coils.