冷拉扁鐵工藝
冷拉扁鐵 分為油拔和粉拔兩種生產(chǎn)工藝，粉拔工藝的鐵材表面沒有油，帶有一層粉末透明體保護(hù)膜，這種膜是潤(rùn)滑
粉生成的，在冷拔過程中起到潤(rùn)滑，冷拔后起到防銹的作用，油拔表面會(huì)生成一種油膜，和粉拔一樣在冷拔過程中起
到潤(rùn)滑，冷拔后起到防銹作用。
這要從生產(chǎn)工藝說起，冷拉扁鐵 的原材料是熱軋鋼，在進(jìn)行粉拔工藝時(shí)會(huì)添加一種潤(rùn)滑粉，這種潤(rùn)滑粉分為石墨粉，
二硫化鉬粉，氫氧化鈣粉，添加不同的潤(rùn)滑粉，拔出的顏色也不同，拔出的冷拔鐵表面顏色分別是黑色，灰色，透明色，所
以我們常看到的冷拔鐵的外觀顏色不同，就是這個(gè)原因，它與冷拔鋼的質(zhì)量沒有關(guān)系，這種潤(rùn)滑粉只是起到潤(rùn)滑作用，在一
定時(shí)間內(nèi)也防銹作用。
還有一種冷拔工藝，冷拔出來的冷拉扁鐵 ，表面光滑精度高，這也是為什么同樣材質(zhì)同樣規(guī)格的扁鐵表面是那么光滑，
表面無印記。
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Can you be more specific about the content of your article? After reading it, I still have some doubts. Hope you can help me.
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