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![]() ![]() ![]() -WORM: 20CR STEEL, CARBURIZATION AND NITRIDING TREATMENT (KEEP THE HARDNESS OF TOOTH SURFACE BE HRC60 AND THE THICKNESS OF HARDEN LAYER OVER 0.5MM AFTER PRECISE GRINDED). -WORM WHEEL: SPECIAL WEARABLE BRONZE AND NICKEL BRONZE ALLOY ![]() ![]() ![]() Products Range
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![]() ![]() TaiZhou QingHua machinery & electric manufacture Co. Ltd.
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