How to choose the right cutting fluid？

There are many kinds of steel, mechanical engineering commonly used steel including:

carbon steel (including low carbon steel, medium carbon steel and high carbon steel),

alloy steel, easy cutting steel and so on. Generally speaking, the machinability of steel is better. 

Because of the different properties of steel, different cutting fluids need to be selected.

-Mild steel

Low carbon steel hardness is low, plasticity is large, easy to produce chip nodules and scale thorns at low and medium speed cutting speed,

 it is not easy to get smooth processed surface.

Emulsified cutting fluid or microemulsified cutting fluid can be used in rough and semi-finish machining. 

It is recommended to use anti-friction cutting oil with good lubrication property or extreme pressure anti-friction cutting oil for finishing.

If you want to reduce the impact on the operating environment, 

you can also choose anti-friction emulsified cutting fluid or micro-emulsified cutting fluid, 

especially when the cutting speed is high, you must consider the oil mist and fire tendency of oil-based cutting fluid.

-Medium carbon steel, high carbon steel or low alloy steel

Medium carbon steel, high carbon steel or low alloy steel hardness is higher than low carbon steel, 

plastic is small than low carbon steel, cutting process, knife - chip,

 knife - between the bonding tendency is smaller, the tendency of chip tumor and scale thorns is not serious, 

compared with cutting low carbon steel, it is easier to get smooth processed surface, 

generally not recommended to use oil-based cutting fluid.

But the exception is precision cutting and forming cutting,

because at this time the cutting speed is generally low,

the tool life and processing quality requirements are higher, 

the cutting fluid lubrication requirements are high, 

should choose extreme pressure cutting oil or antifriction extreme pressure cutting oil.

-Free-cutting steel

The machinability of easy cutting steel is very good, 

and its relative machinability is 2.5-3.0. 

It is not dependent on the performance of cutting fluid, 

and all kinds of water-based cutting fluid can be applied.