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公司基本資料信息
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1. The outside surface no crack, scallops, sesame, touch mark, burr defect. Bore no oxidation corrosion.
2. After carburizing and quenching, carburizing layer not more than 40% of the total thickness, the surface carburized layer depth of 0.3-0.5, the surface hardness HRA78-83, with product hardness difference not more than three units.
The core hardness HRC35-45, quenching after clear oil dirties impurity.
3.. According to GB/T 1804-2000 regulations.
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