Is GREY cast iron machinable?

The presence of graphite flakes makes the grey iron easily machinable as they tend to crack easily across the graphite flakes. Grey iron also has very good damping capacity and hence it is often used as the base for machine tool mountings.

Which metal has the highest machinability?

steel
Therefore, steel has the best machinability with medium amounts of carbon, about 0.20\%. Chromium, molybdenum and other alloying metals are often added to steel to improve its strength.

Why is GREY cast iron easily machined?

In grey cast iron, most of the carbon is present in the form of graphite flakes, which make the material softer, more machinable and less brittle than white cast iron.

Which type of cast iron has good machinability?

The machinability of gray cast iron is generally quite good because of the presence of near continuous graphite flakes in the microstruc- ture. The flakes’ presence promote chip formation,1 as well as lubrication during the machining operation.

How can machinability of grey cast iron be improved?

The hardness and strength of the grey cast iron describes: quantity, size and distribution of graphite flakes, the amount of free ferrite and lamellar pearlite. Machinability can be improved with C, Si, S and Si/Mn alloying elements. The opposite effects have elements like Mo, Mn and Cr5.

Which cast iron is most brittle and not machinable?

White cast irons
White cast irons are hard and brittle; they cannot easily be machined. They are unique in that they are the only member of the cast iron family in which carbon is present only as a carbide. White cast iron has a light appearance due to the absence of graphite.

What is a good machinability rating?

The machinability rating is determined by measuring the weighed averages of the normal cutting speed, surface finish, and tool life for each material. Machinability rating less than 100\% is more difficult to machine than B1112 and material with a value more than 100\% is easier.

Which material is suitable for 100\% machinability?

The American Iron and Steel Institute has adopted ratings for measuring the machinability of metals. AISI No. 1112 carbon steel is arbitrarily assigned a machinability rating of 100\%.

How can machinability of GREY cast iron be improved?

How can you increase iron machinability?

What is the difference between grey cast iron and carbon steel?

Unlike grey cast iron, it is a tough material with good fatigue resistance. Its mechanical properties are equivalent to plain carbon steel like 1045 and 1020, but with better machinability equivalent in the levels of 1140 and 12L14. It is widely used for Gears and shafts in the automotive industry.

Is cast iron stronger than mild steel?

However, cast iron has better compressive strength than mild steel. Due to this, it will have greater resistance against breaking under compression. This also makes it quite durable and ideal for rugged use. It will not show signs of wear and tear easily and you can expect long term performance from cast iron.

Why is cast iron the best material for machining?

Brittle material such as cast iron are almost elastic up to ultimate tensile strength and produce discontinuous chips which break away from the sample easily. This helps to improve the cutting ability. Due to this, cast iron is the preferred material when it comes to high machinability and strength.

What is the machinability of greygrey cast iron?

Grey Cast Iron – Machinability Material HB Machinability SAE DIN GG10 175 170\% A48-20B GG10 GG20 205 127\% A48-30B GG20 GG25 220 112\% A48-35B GG25 GG30 230 104\% A48-45B GG30