This is applied to heavy truck brake and it is made by CNC with on time forming, the surface treatment is electrophoresis or zinc-plating.
Precision spring used in national defense, marine, aerospace, electronics, machinery, electrical, watches and other fields.
The heat treatment process of the hot forming spring - most of which are formed by the combination of hot forming and heat treatment, and most of the coil springs are heat treated after hot forming. The heat treatment method of this kind of spring steel is quenching + medium temperature tempering. The elastic limit and yield limit of this kind of structure are high, and have certain toughness.
First, the working conditions and materials and heat treatment requirements 1 simple shape, small cross-section, the force is not large spring
Requirements: 65 785-815 DEG C oil quenching, at 300 DEG C, 400 C, C = 500. 600 degrees tempering, the corresponding hardness HB512, HB430, HB369,75780-800 DEG C oil or water quenching, 400-420 C tempering, HRC42-48.
2 medium load large springs
Requirements: 60Si2MnA 65Mn 870 DEG C oil quenching, tempering at 460 degrees C, HRC40-45 (agricultural seat spring 65Mn quenching and tempering HB280-370)
3 heavy load, high spring, high fatigue limit of large leaf spring and spiral spring requirements: 50CrVA, 60SiMnA 860 DEG C oil quenching, tempering at 475 degrees C, HRC40-45
4 the diameter of the 8-10mm coil spring working under multiple alternating load
Requirements: 50CrMnA 840-870 DEG C oil quenching, tempering at 450-480 DEG C, HB387-418 5 locomotives, vehicles, water tankers or plate springs
Requirements: 55SiMn, 60Si2Mn HRC39-45 (hb363-432) leaf spring (55Si2Mn HB363-441)
6 vehicle and buffer coil spring, automobile tension spring
Requirements: 55Si2Mn, 60Si2Mn, 60Si2CrA quenching, tempering, HRC40-47 or HB370-441
7 diesel pump plunger spring, injector spring, diesel engine valve spring and medium-sized, heavy duty automobile valve spring and plate spring 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