西門子氣體分析儀-測量頭C79451-A3462-B598安全至上操作說明
有些缺陷如脫碳、過熱等不借助金相顯微鏡也不能定量正確判定。而這類缺陷在評價線材質(zhì)量中占重要的地位。當(dāng)碳含量在.3％以上的線材，應(yīng)嚴格控制其表面脫碳層的深度，脫碳是表面形成犬牙狀的鐵素體嵌入基體中，將嚴重影響線材的抗拉強度，尤其影響其疲勞強度。用于冷拉的線材由于內(nèi)外組織差異還會增加變形抗力。所以重要的直接用作冷拉材和高強螺栓、冷墩的線材都要求嚴格控制脫碳層的深度。下表是一些廠家實際控制脫碳層深度。（注：需要在實習(xí)中收集相關(guān)資料）冷拉、冷墩用線材的脫碳層要求鋼種線材直徑范圍，mm鐵素體脫碳層深度，mm全脫碳層深度，mm碳素鋼＜.15＜.15＜.359.5~12.1＜.127＜.35612.7~18.6＜.152＜.44低合金鋼4.8＜.51＜.1524.8~6.4＜.76＜.236.4~9.5＜.76＜.2549.5~12.7＜.12＜.35＞12.7＜.127＜.356縮孔、夾雜、分層、過燒等都是不允許存在的缺陷。
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