Effect of 900 Y soaking + 500 °C patenting for 54 s
air cooling treatment on structure and properties of cold drawn wire of 70 steel (0. 67% ~0. 75% C) with 38. 9% reduction from Φ5. 5 mm hot rolled wire has been studied. Results show that with 500℃ patenting treatment the inoculation and transformation time of under-cooling austenite of the steel is shortest
the tensile strength and elongation of steel wire increase respectively by 21. 4% and by 9. 5% to establish the foundation for further increasing the comprehensive mechanical properties of steel wire by finishing fine drawing process.