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Heat treatment of high-carbon chromium bearing steels, STB 2 (AISI 52100 or JIS SUJ 2), with excellent resistance to rolling contact fatigue, was attempted by spheroidized annealing, partial austenitizing, and then isothermal transformation. The rolling contact fatigue test was conducted at a shaft speed of 1700 rev min -1 under axial load, 506 kg, circulating the lubricant using a thrust-type...
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