Grey Iron Grades

2023-12-27

Grey iron is a type of cast iron known for its unique combination of strength, durability, and affordability. It is used in a wide range of applications, including cylinders, pumps, automotive components, and more. Grey iron grades are assigned to grey iron materials based on different factors such as their tensile strength, hardness, and other properties. Here are some commonly used grey iron grades:


Class 20 Grey Iron: This is the most brittle grey iron, and it has the lowest tensile strength and hardness. It is generally used in low-stress applications such as electrical boxes.


Class 25 Grey Iron: This grade of grey iron has a slightly higher tensile strength and hardness and is commonly used for pump housings and thin-walled automotive parts.


Class 30 Grey Iron: This is the most common grade of grey iron with a relatively high tensile strength and hardness. It is commonly used in heavy-duty applications such as gearboxes, brake drums, and engine blocks.


Class 35 Grey Iron: This grade of grey iron has a higher tensile strength and hardness than class 30 grey iron. It is commonly used for high-stress applications such as crankshafts, heavy-duty gears, and machine tool parts.


Class 40 Grey Iron: This grade of grey iron is the strongest and the hardest. It is commonly used in high-stress applications such as heavy-duty gears, engine blocks, and turbine housings.


Overall, the choice of grey iron grade depends on the specific requirements of the application. Knowing the different grades of grey iron can help select the one best-suited for a particular application to ensure a reliable, durable, and high-performance end-product.