1. Material and characteristics.
P4410 is a plastic mold steel with excellent processing properties and good surface quality. The material performs well in the range of hardness value of 32 36hrc, has good machinability such as turning, milling, grinding, etc., and can be cooled in air to achieve hardening after local heating, so that the local surface hardness can reach 56 62hrc, prolonging the service life of the mold. In addition, the surface of the mold can be chrome-plated to improve wear and corrosion resistance. The welding quality is good, and it can also be repaired by repair welding after local damage. The steel produced by the special process has high purity, fine structure, good mirror polishing performance, and its performance ratio is better than that of imported equivalent products.
2. Chemical composition and physical properties.
The main chemical composition of P4410 is carbon(c)028%~0.4%, silicon (Si) 02%~0.8%, manganese (Mn) 06%~1.0%, sulfur (s) 0015%, phosphorus (p) 002%。The ratio of these elements gives it a combination of high purity and high hardness and toughness. The critical point temperature was ACL=725, AC3=810, and MS=280.
Heat treatment process.
The pre-hardening specifications for P4410 steel are as follows:
The heating temperature is 860 900 . This temperature ensures that the steel achieves the desired hardness during preheating. At the same time, it is important to note that too high a heating temperature may cause oxidation or decarburization inside the material, affecting its performance.
The cooling method is oil or air cooling. The cooling rate is one of the important factors that determine the hardness of steel. Choosing the appropriate cooling method allows the steel to be cooled quickly and evenly to achieve a predetermined hardness value. Oil-cooled oil can reduce the risk of cracking to some extent, but it is also necessary to pay attention to the cleanliness of the oil and the impact on the environment.
Tempering temperature 550 620 . After the pre-hardening process is completed, a tempering operation is required to stabilize the structure and properties of the material. The right tempering temperature can relieve stress, improve toughness, and maintain stable hardness. Depending on the requirements, different tempering temperatures can be selected to ensure optimal performance.
The pre-hardening hardness is 42 48HRC. Steels that have undergone the above processing specifications will have the expected hardness range, which is 42 to 48HRC (Rockwell hardness). Such hardness is suitable for most machining and application scenarios, providing good wear resistance and toughness.
P4410 Specification for quenching and tempering of steel.
The quenching temperature is 860 °C. The purpose of quenching is to enable the metal material to obtain the necessary hardness and strength through heating and rapid cooling. Quenching at this temperature can effectively change the microstructure of the steel, making it harder and more wear-resistant.
The tempering temperature is 650 °C. After quenching, the steel is often reheated and cooled to relieve the internal stresses caused by quenching and improve its toughness. Tempering at this temperature helps stabilize the properties of the steel and prevent deformation and cracking.
Third, the field of application.
P4410 is suitable for manufacturing large, complex and precise plastic molds, such as those required for automotive parts, medical equipment, electronic equipment and other fields. Due to its high precision and durability, this material has become one of the important choices for modern injection molding.