COLD VS HOT ROLLED
Improved size and section
- Tighter size & section tolerances
- Dimensional consistency within each bar & also from bar to bar
Improved steel surface finish / reduces surface machining & improves quality
- Cold drawn steel
- Ground and polished steel
- Surface improvement (shaving or turning to produce defect free surface)
Improved straightness / facilitates automatic bar feeding
Increased mechanical properties / can reduce the need for hardening
- Yield strength
- Tensile strength
- Hardness
Improve machinability and productivity / enables higher machining feeds & speeds and improved machined finish.
- Increased machining rates
- Longer tool life
- Improved yield
Improved cost effectiveness / optimizes machinability and reduces yield losses
- Yield & tensile strength is better than hot rolled material
- Tighter size & section tolerances