What is the material of brake discs?
2 Answers
The material of brake discs adopts the domestic gray cast iron 250 standard, abbreviated as HT250, which is equivalent to the American G3000 standard. The requirements for the three main chemical elements are: C: 3.1~3.4, Si: 1.9~2.3, Mn: 0.6~0.9. More details are as follows: Mechanical performance requirements: tensile strength >=206MPa, bending strength >=1000MPa, deflection >=5.1mm, hardness should be between 187~241HBS. Alternative names: In English, brake discs are usually referred to as BRAKE-DISC or BRAKE-ROTORS, while brake drums are called BRAKE-DRUM. Additionally, in southern China, brake discs are also known as brake discs or brake rotors. In fact, they all refer to the same thing.
As someone who frequently works on my own car, I've found that the most common material for brake rotors is cast iron. This material is cheap and durable, capable of withstanding the high temperatures and pressures of daily driving. Cast iron brake rotors are used in most vehicles because of their low cost, simple manufacturing process, and effective heat dissipation, which helps the braking system function stably. However, they also have drawbacks, such as being prone to rust, especially in rainy or humid conditions. After prolonged parking, the rotor surface can corrode, affecting braking performance. Therefore, some high-end models have started using composite materials, such as coated cast iron, which resists rust and extends lifespan. When choosing materials, consider your driving habits. If you mostly drive in the city, cast iron is sufficient. But if you frequently drive in mountainous areas or at high speeds where heat buildup is significant, upgrading to a better material may be necessary for safety. Ultimately, material choice directly impacts braking effectiveness and cost-efficiency, so don’t forget to check rotor thickness and wear during maintenance.
