Common Problems And Solutions For Cold Rolling Of Cns Scr420 Steel - China

Common problems and solutions for CNS SCr420 steel

1 - Surface scratches - roll wear/foreign matter intrusion - need to replace rolls regularly, strengthen filtration of lubricants

2 - Edge cracks - too high reduction rate or too low edge temperature - should reduce the deformation per pass, preheat the edge

Thickness fluctuations

3 - Insufficient mill stiffness or unstable tension - calibrate roll gap, PID control tension

4 - Poor plate shape - uneven roll gap adjustment or residual stress - use CVC mill or bending roll technology to correct Application suggestions

Typical uses:

High-precision cold-rolled strip steel (thickness 0.5~3mm): gear ring, precision shaft sleeve.

Cold-formed structural parts: complex shape parts that require subsequent carburizing and quenching.

Alternatives:

If higher strength is required: consider 20MnCr5 (GB 20MnCrH).

If better formability is required: choose 20CrMoH (add Mo element).

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