People. I need your colaboration.
What value of hardness do you think is the minimal to not worsen the maquinability level of the steel?
I work with steel of 0,1% C.
I some of you have a paper, is very useful for me.
Many thanks.
Debasish Mondal
Steels between 0.15- 0.30 wt% carbon are best machining; above 0.30 wt% the machinability decreases as carbon content (and hardness) increase.
Thermal Treatment improves the machinability of steel by reducing stresses, controlling microstructure, and lowering hardness and strength and is usually employed in higher carbon steels.
Additives that promote machining include
- Sulfur combines with Manganese to form Manganese Sulfides which help the chip to break and improve surface finish.
- Lead is added to steel to reduce friction during cutting by providing an internal lubricant. Lead does not alter the mechanical properties of the steel.
- Phosphorus increases the strength of the softer ferrite phase in the steel, resulting in a harder and stronger chip (less ductile) promoting breakage and improved finishes.
- Nitrogen can promote a brittle chip as well, making it especially beneificial to internal machining operations like drilling and tapping which constrain the chip’s movement.
- (Nitrogen also can make the steel unsuitable for subnsequent cold working operations like thread rolling, crimping, swaging or staking.)
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