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Quenching of hot rolled steel rod to form martensite - where rod is then descaled, cold drawn, and formed into high tensile steel coil springs, which are tempered
Quenching of hot rolled steel rod to form martensite - where rod is then descaled, cold drawn, and formed into high tensile steel coil springs, which are tempered
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机译：对热轧钢棒进行淬火以形成马氏体-然后将其除鳞，冷拔，然后制成高强度钢螺旋弹簧，并进行回火
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The parent patent described the mfr. of high tensile steels, esp. spring steels. Improvement comprises the use of an unalloyed-or a low alloy-steel with a restricted C. content, and esp. contg. =0.33%C. Directly after leaving a hot rolling mill, the steel is subjected to a multistage, intermittent quenching treatment, so martensite is formed which extends into the core of the rolled rod. The steel rod is next descaled, and is then cold drawn without any prior treatment, followed by using the rod to make a final prod., esp. helical coil springs, which are tempered. The main patent used a similar quenching process to obtain a martensitic structure, which was then tempered by induction heating. But the induction heating interferes with continuous high speed rolling, and is eliminated in the addn.
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