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上: 機車避震器鋼管. 下: 吊勾---鋼廠出廠後的棒(或管)材表皮通常有脫碳層, 如果未經削皮, 直接熱鍛+淬火硬化後, 脫碳層仍然不會消失. A decarbed surface layer is always present on as-delivered steel bar stock. After hot forging and Q+T, it won't go away if bar stock is not machined.
上: 標尺 I=10 um 白色 條/塊 狀物為肥粒鉄
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