Oil quenching - tempering spring steel wire microstructure for the uniform tempering martensite or tempered sorbite, isotropic, in the same tensile strength under the conditions, than the cold drawn steel wire has a higher flexibility limit, there are Good elastic properties, resistance to stress relaxation performance and creep resistance is better than cold drawn steel wire; to ensure that the relaxation rate ≤ 6.0%, cold drawn carbon steel wire the maximum working temperature of 120 ℃, oil quenching - The maximum working temperature of the steel wire is 150 ℃, the maximum working temperature of 55Cr2 and 55Si2MnA is 250 ℃, and the maximum working temperature of 65Si2MnWA is 350 ℃. The use of oil quenching - tempering wire wound spring, the elimination of stress after the direct use of tempering, simplifying the spring plant production process, reduce production costs; and the original winding and then quenching - tempering spring compared to the spring Surface decarburization and mechanical properties of the uniformity of a fundamental improvement in fatigue life has increased several times. At present, Japan's alloy spring wire standard, has been completely quenched with oil quenching - replaced the state of cold-drawn state. China in recent years, large-scale oil quenching - tempering wire to replace the cold-drawn steel wire trend. Oil quenching - tempering the shortcomings of the wire is improper handling of surface oxidation, decarbonization heavier, affecting fatigue life; wire hydrogen embrittlement sensitivity, resistance to stress corrosion slightly worse.
China's current standard GB / T18983-2003 "oil quenching and tempering spring steel wire" is drafted with reference to ISO / FDIS8458-3, since the date of implementation in 2003, instead of YB / T5008 (the original GB2271) "valve oil quenching - tempering Chrome vanadium alloy spring wire ", YB / T5102 (original GB / T4359-85)" valve oil quenching - tempering carbon spring steel wire ", YB / T5103 (original GB / T4360-85)" oil quenching - Spring steel wire ", YB / T5104 (original GB / T4361-85)" oil quenching - tempering silicon manganese spring steel wire ", YB / T5105 original (GB / T5362
-85) "Valve oil quenching - Tempered chrome silicon alloy spring wire". The world's most advanced standard is the European Standardization Committee in October 2011 release, in April 2012 the formal implementation of the new standards: EN 10270-2: 2011 (E) "mechanical spring steel wire - Part 2: oil quenching - tempering Spring steel ".