What is difference between grey cast iron and white cast iron?

Like gray cast iron, white cast iron features many small fractures. The difference is that white cast iron features cementite below its surface, whereas gray cast iron features graphite below its surface. The graphite creates the appearance of a gray color, while the cementite creates the appearance of a white color.

Is grey cast iron harder than white?

White cast iron is harder than grey, to the point that it is quite brittle. Grey iron, by contrast, is softer but stronger. The two types are sometimes combined, allowing a piece to be made with a hard outer coating of white iron and a strong core of grey.

What is the difference in the fracture surface of grey cast iron and white cast iron explain why their fracture surface are different?

A key difference between grey cast iron and white cast iron is that after fracturing, white cast iron gives a white coloured crack surface and grey cast iron produces a grey coloured fractured surface. This is basically due to their constituents in the alloy.

Which is more brittle grey cast iron or white cast iron?

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.

Is white cast iron good?

White cast iron has high compressive strength and retains good hardness and strength at a higher temperature. The presence of different carbides, depending on the alloy content, makes white cast irons extremely hard and abrasion resistant but very brittle.

TYPES OF CAST IRON | PROPERTIES OF CAST IRON | GREY CAST IRON | WHITE CAST IRONS |DUCTILE CAST IRON

What is white iron used for?

White cast irons are used in abrasion-resistant parts where it's brittleness is of minimum concern such as shell liners, slurry pumps, ball mills, lifter bars, extrusion nozzles, cement mixers, pipe fittings, flanges, crushers and pump impellers. A popular grade of white iron is high chrome white irons, ASTM A532.

What is grey cast iron used for?

Grey cast iron's high thermal conductivity and specific heat capacity are often exploited to make cast iron cookware and disc brake rotors. Its former widespread use on brakes in freight trains has been greatly reduced in the European Union over concerns regarding noise pollution.

What are the 5 types of cast irons?

Various types of cast irons are produced using different heat treatment and processing techniques, including gray iron, white iron, malleable iron, ductile iron, and compacted graphite iron.

How can you tell if cast iron is white?

White cast iron gains its name and appearance from the compounds known as cementite and pearlite within its structure. Similar to its gray counterpart, white cast iron features multiple small flakes and fractures. Unlike its gray counterpart, though, white cast iron has a low carbon and silicone content.

Which cast iron is hardest?

Because of their austenitic matrix and with flake graphite, the high-nickel cast irons are the toughest of all cast irons. The flake graphite also gives them excellent machinability and good foundry properties, although this gives them lower tensile strengths.

Is grey cast iron tough?

Unhardened grey iron is “fragile” compared to other cast metals. The graphite flakes create areas of weakness in the metal where fractures can begin that will split the metal. This propensity to fracture is why grey iron has low tensile and impact strength.

Which type of cast iron is the most widely used?

Grey cast iron is characterised by its graphitic microstructure, which causes fractures of the material to have a grey appearance. It is the most commonly used cast iron and the most widely used cast material based on weight.

What are the advantages of malleable cast iron over white or grey cast iron?

Malleable iron shows greater ductility than gray iron, and while hard, it lacks the brittleness of white iron. Although not cast as easily as gray iron or ductile iron, it will cast better than some other materials, including white iron. Additionally, malleable iron offers excellent surface hardening.

Does grey cast iron has high melting point?

Melting Point of Cast Irons

Melting point of gray cast iron – ASTM A48 steel is around 1260°C. Melting point of martensitic white cast iron (ASTM A532 Class 1 Type A) is around 1260°C.

Which type of cast iron is soft?

Ductile cast iron is also referred to as nodular cast iron which is found to be ductile cast iron is a type of soft, ductile iron alloy accompanied with a high carbon content.

Is gray iron magnetic?

Magnetic Properties

The actual graphite structure and the type of grey iron influence properties such as permeability, coercive force and hysteresis. All grey irons exhibit ferromagnetism except austenitic grades.

Why is it called pig iron?

The term “pig iron” dates back to the time when hot metal was cast into ingots before being charged to the steel plant. The moulds were laid out in sand beds such that they could be fed from a common runner. The group of moulds resembled a litter of sucking pigs, the ingots being called “pigs” and the runner the “sow.”

What is G3000 cast iron?

Formulated with theG3000 cast iron specification, DFC G3000 Brake rotors are engineered to match OEM specifications for durability, reliability, and stability. Each rotor casting is sent to our state of the art machining facilities, where it is processed to the tightest tolerances available in the market today.

What is white cast iron?

What Does White Cast Iron Mean? White cast iron is a type of carbon-iron alloy that contains carbon content greater than 2% in the form of cementite. The name white cast is derived from its white surface, which is caused by carbide impurities that allows cracks throughout the metal.

What are the 4 basic types of cast iron?

Is cooking in cast iron healthy?

Cast iron isn't all about frying

But its ability to retain heat also lends itself to healthy cooking, says Kerri-Ann Jennings, a Vermont-based registered dietitian and nutrition coach. That includes water-based methods such as braising and poaching as well as quick broiling and grilling, which don't require much oil.

Does cast iron rust?

Without the protective layer of carbonized oil called seasoning, cast iron is susceptible to rust. Even a well-seasoned pan can rust if it's left in the sink to soak, put in the dishwasher, allowed to air dry, or stored in a moisture-prone environment.

What is the percentage of grey cast iron?

The presence of graphite gives a grey shade to the fractured surface of cast iron. Therefore, when all the carbon in cast irons is in the form of graphite, it is called Grey cast Iron. Grey cast iron with a carbon content of 2.4% - 3.8%.

Can cast iron be welded?

It is possible to weld cast iron, but it needs to be done using the correct techniques and with care to avoid cracking. Most welding methods require the surface of the material to be cleaned and cast iron benefits from pre and post-weld heating as well as careful cooling.