1. Q: What are the material properties of E52100 steel pipe? A: E52100 is a high-carbon, high-chromium bearing steel (corresponding to AISI 52100) with a carbon content of 0.98% to 1.10% and a chromium content of 1.30% to 1.60%. Its core properties include ultra-high hardness (HRC 58-65), excellent wear and fatigue resistance, and a microstructure characterized by uniformly distributed fine spherical carbides. This material has extremely poor weldability and is generally prohibited from welding.
2. Q: What are the typical mechanical properties of E52100 steel pipe? A: After quenching and low-temperature tempering, typical properties are: tensile strength of 1800-2200 MPa, yield strength of 1500-1900 MPa, and elongation of 5%-8%. Bainite austempering can improve toughness (impact energy ≥ 15J), but the hardness will drop to HRC 55-58. Contact fatigue life can reach over five times that of ordinary carbon steel.
3. Q: What are the key heat treatment processes for E52100? A: Key processes include: spheroidizing annealing (slow cooling from 790°C to 710°C followed by holding) to improve workability; oil quenching at 815-845°C; and low-temperature tempering at 150-200°C to maintain high hardness. Large-section parts require staged quenching, and tempering within one hour after quenching to prevent cracking. Special care should be taken to avoid slow cooling around 300°C, which can cause temper brittleness.
4. Q: What are the advantages of E52100 compared to E51100 steel? A: Due to its higher chromium content (1.3%-1.6% vs. 0.9%-1.15%), E52100 offers better hardenability (suitable for larger cross-section parts), superior corrosion resistance, and high-temperature stability. However, E51100 is less expensive and can achieve similar wear resistance through optimized heat treatment.
5. Q: What are the main applications of E52100 steel pipe? A: It is mainly used in: aircraft engine bearings, precision machine tool spindle bearings, high-performance cutting tools (surgical instruments, engraving knives), high-end stamping dies and other fields that require extremely high wear resistance and precision. Surface treatment is required when used in corrosive environments.
