What is the hardest that gray cast iron can be?

The carbon content in White Cast Iron is 1.75 to 2.3%. It is white because carbon is in the form of carbide (known as cementite) which is the hardest constituent of Iron….Detailed Solution.

Iron alloy Hardness BHN
Gray Cast Iron 150 – 320
Nodular Cast Iron 170 – 330
Malleable 140 – 285

What is ASTM A48 Class 35b?

Cast iron ASTM A48 class 35 is equal to HT250, FC250, GG25, G25, FGL250, T260, O125, which is a type of high grade gray cast iron. The followings are its application, physical properties, chemical composition and our opinion.

What are the different grades of cast iron?

The 4 Types of Cast Iron

  • #1) Gray Cast Iron. The most common type, gray cast iron features a graphite microstructure consisting of many small fractures.
  • #2) White Cast Iron. While not as common as gray cast iron, white cast iron is another type worth mentioning.
  • #3) Ductile Cast Iron.
  • #4) Malleable Cast Iron.

What is the difference between gray and ductile iron?

Ductile iron has a greater resistance to impacts, and is able to resist a minimum of 7 foot pounds of impact (versus 2 pounds of impact for gray iron). This means that while ductile iron can be used in critical applications that involve impact, gray iron has limits that prohibit it from being used for certain purposes.

Why is GREY cast iron so brittle and resistant?

The tips of the flakes act as preexisting notches at which stresses concentrate and it therefore behaves in a brittle manner. The presence of graphite flakes makes the grey iron easily machinable as they tend to crack easily across the graphite flakes.

Why is grey cast iron used for engine blocks?

Two types of material were selected for engine blocks: gray cast iron, and aluminum alloy. The lightness of these metals and excellent thermal conductivity give them excellent fluidity.

Which is purest form of iron?

Wrought Iron
Wrought Iron is the purest form of iron.

What is the ductile iron?

Ductile iron—also referred to as spheroidal or nodular iron—is actually a group of irons that exhibit high strength, flexibility, durability, and elasticity due to their unique microstructure. Cast ductile iron normally contains over 3 percent carbon; it can be bent, twisted, or deformed without fracturing.