Cold rolled steel is generally more challenging to cut than hot rolled steel due to its higher hardness and strength, which result from the cold rolling process. However, its machinability depends on factors like:

Material Hardness – Cold rolled steel has a smoother surface and tighter tolerances but is harder than hot rolled steel, requiring appropriate tools and techniques.

Tool Selection – Carbide or high-speed steel (HSS) cutting tools are recommended to handle the increased hardness.

Cutting Method – Laser cutting, waterjet, or plasma cutting work well, but conventional methods (e.g., sawing, shearing) may require slower speeds or lubrication.

Work Hardening Risk – Excessive friction can harden the steel further, so controlled feed rates and cooling (cutting fluids) help prevent premature tool wear.

Automotive Stamping & Steel Mills Perspective
In automotive stamping, cold rolled steel is widely used for its precise dimensions and strength, but cutting/blanking operations require:

High-quality dies and shear blades to maintain edge quality.

Proper lubrication to reduce wear and heat buildup.

Steel mills supply cold rolled steel with controlled mechanical properties, and some grades (e.g., low-carbon steels) are easier to cut than high-strength alloys.

Conclusion: While cold rolled steel is harder to cut than hot rolled, modern tools and techniques make it manageable for industrial applications like automotive manufacturing.