Heat treatment process of hot spring forming in this way is the most hot spring forming molding and heat treatment together, and it is most spiral spring and then heat-treated in hot forming. The heat treatment of spring steel quenching tempering heat treatment, the microstructure is tempered trooslite. The elastic limit of this organization and the yield limit is high, and has certain flexibility.
First, the working conditions and material and heat treatment requirements of 1. simple shape, a smaller cross-section, the spring force.
Requirements: 65 785-815 C oil quenching, 300 C 400 C and 500 C. 600 C tempering, the corresponding hardness of HB512, HB430, HB369,75780-800 C 400-420 C oil or water quenching, tempering, HRC42-48.
Large spring 2. medium load
Requirements: 60Si2MnA 65Mn 870 C 460 C oil quenching, tempering, HRC40-45 (agricultural seat spring 65Mn withhardend HB280-370)
Shaped leaf spring and a spiral spring 3. spring, high load and high fatigue limit requirements: 50CrVA, 60SiMnA 860 C 475 C oil quenching, tempering, HRC40-45
4. times in alternating load working under 8-10mm diameter coil spring
Requirements: 50CrMnA 840-870 C 450-480 C oil quenching, tempering, HB387-418 5. locomotives, vehicles, tender or plate spring
Requirements: 55SiMn, 60Si2Mn HRC39-45 (hb363-432) (Jiefang Automobile Spring: 55Si2Mn HB363-441)
6. vehicles and automobile buffer spiral spring, tension spring
Requirements: 55Si2Mn, 60Si2Mn, 60Si2CrA or HB370-441 HRC40-47 quenching and tempering.
Valve spring and plate spring 7. diesel pump spring, injector spring, diesel engine valve spring and the medium and heavy vehicle requirements: 50CrVA quenching, tempering, HRC40-47
A coil spring 8. working in high temperature steam under the tap water pipe and flat spring, spring and spring sea water erosion resistance, with 10-25mm 3Cr13 HRC39-46 4Cr13 HRC48-50: spring HRC48-49 HRC47-49HRC37-40 HRC31-35 HRC33-47 9. in acid media work