Does gray cast iron have a yield strength?

Does gray cast iron have a yield strength?

While gray iron does not have a measurable yield strength, the range for tensile strength is 20,000 psi – 60,000 psi.

What is the difference between cast iron and grey 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.

Why does grey iron serve well in any machinery applications?

Grey iron is easy to machine as it has high compressive strength, low tensile strength and no ductility. A positive property of grey iron is that free graphite acts as a lubricant in its structure. For this purpose, it is well suited for sections where sliding action is required.

What is the hardest that GREY cast iron can be?

gray irons are equally strong, or equally hard. As in steel, tensile strength and hardness are closely related. In gray irons, tensile strength ranges from about 14 MPa (20,000 psi) to more than 35 MPa (50,000 psi). The hardness of the strongest grades is double that of the weakest grades.

What reduces ductility of a grey cast iron?

Large graphite flakes reduce the strength and ductility, so inoculants are used to promote fine flakes. Gray cast iron is named after its gray fractured surface, which occurs because the graphitic flakes deflect a passing crack and initiate countless new cracks as the material breaks.

How can I tell if my cast iron is GREY?

If you use a powerful microscope you can see the graphitic microstructure that makes grey iron so easily identifiable. In a grey iron casting, you can see little black flakes of graphite. These flakes cause fractures and cause the material to have a grey appearance.

What is the reason of low toughness of GREY cast iron?

Explanation: Grey cast iron has very poor toughness. Its major reason is notch like an effect of graphite flakes. These flakes increase stress concentration in it lowering toughness.

What is GREY cast iron used for?

It is the most common cast iron and the most widely used cast material based on weight. It is used for housings where the stiffness of the component is more important than its tensile strength, such as internal combustion engine cylinder blocks, pump housings, valve bodies, electrical boxes, and decorative castings.

What is grey iron used for?

Gray Iron is commonly used in static castings where the rigidity or stiffness of the part is more important than the tensile strength or elongation, such as engine blocks, various housings, valve bodies, mold castings, and so on.

Why does the GREY cast iron impart GREY color?

Grey cast iron (a.k.a. gray iron castings) is a type of iron found in castings known for its grey color and appearance caused by graphite fractures in the material. In a grey iron casting, you can see little black flakes of graphite. These flakes cause fractures and cause the material to have a grey appearance.

What reduces ductility of a GREY cast iron?

What is reason of low toughness of GREY cast iron?

Why is gray cast iron more difficult to machine?

Thus while the machinability of standard gray cast iron is relatively high, newer alloyed gray irons with higher strength and increased thermal resistance are increasingly more difficult to machine.

What’s the fastest time for a half Ironman?

The top professional male triathletes can clock sub-4hr Half Ironman times, often in the range of 3:50-4:05. However, Jan Frodeno currently holds the Half Ironman record with a blazing fast time of 3:36:30.

Which is the best flat work iron machine?

Ecostar Flat work Iron Machines manufactured by us are widely used in the industry mainly because of its unmatched performance. This product is developed using advanced machines and tools which can clearly evident with the smooth performance of the machine. The Roller type flat work irons is tested for its sturdiness and long lasting nature.

How big is the flatwork ironing machine drum?

The main drum diameter of 800 mm using high-quality stainless steel material, the surface through special treatment, not easy to twist linen sizing powder paste, so the use of the characteristics of long service life heat transfer efficiency, high quality ironing speed. The unique differential design and ironing belt installation.