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Why is the surface hardness of high-frequency quenching equipment steel after induction quenching higher than that of ordinary quenching? - Indukcijsko talilna peč, peč za indukcijsko ogrevanje, indukcijsko utrjevalna peč, peč za dušenje, ognjevzdržna opeka, kitajska tovarna, dobavitelj, proizvajalec, trgovec na debelo
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