What is the difference between Q235 and 45# steel?
A: Q235: low carbon, structural, weldable/formable. 45#: medium carbon, higher strength, hardens/strengthens by heat treatment.
What surface defects are common?
A: Scale, pitting, roll marks, slight scratches. Severe: cracks, laps, scabs, inclusions.
What are the edge conditions?
A: Mill edge (as-cut), sheared, milled, or rounded.
How is Q235 plate typically processed?
A: Cutting (flame/plasma/laser), bending, welding, drilling, punching, machining.
What is the machinability of Q235?
A: Good machinability but tends to form built-up edge (BUE) on sharp tools; use sharp tools and adequate coolant.