熱(re)(re)(re)鍍(du)鋅(xin)(xin)(xin)(xin)(xin)方(fang)(fang)管(guan)(guan)(guan)(guan)的(de)(de)(de)內(nei)壁和(he)外(wai)(wai)壁均有(you)鋅(xin)(xin)(xin)(xin)(xin)層(ceng)附(fu)著，會有(you)水紋和(he)少許(xu)鋅(xin)(xin)(xin)(xin)(xin)瘤，但整(zheng)體(ti)鋅(xin)(xin)(xin)(xin)(xin)層(ceng)較(jiao)(jiao)厚，方(fang)(fang)管(guan)(guan)(guan)(guan)內(nei)外(wai)(wai)壁鋅(xin)(xin)(xin)(xin)(xin)層(ceng)厚度在(zai)70μm以上(shang)。 由于冷(leng)鍍(du)鋅(xin)(xin)(xin)(xin)(xin)方(fang)(fang)管(guan)(guan)(guan)(guan)與熱(re)(re)(re)鍍(du)鋅(xin)(xin)(xin)(xin)(xin)方(fang)(fang)管(guan)(guan)(guan)(guan)在(zai)鍍(du)鋅(xin)(xin)(xin)(xin)(xin)工(gong)藝(yi)有(you)很(hen)大的(de)(de)(de)差別。冷(leng)鍍(du)鋅(xin)(xin)(xin)(xin)(xin)方(fang)(fang)管(guan)(guan)(guan)(guan)的(de)(de)(de)角棱部(bu)位(wei)(wei)容易(yi)產生(sheng)"電燒(shao)"該部(bu)位(wei)(wei)顏(yan)色灰暗，鋅(xin)(xin)(xin)(xin)(xin)層(ceng)較(jiao)(jiao)厚。在(zai)陰角部(bu)位(wei)(wei)易(yi)形成(cheng)電流死角產生(sheng)欠電流區，該部(bu)位(wei)(wei)鋅(xin)(xin)(xin)(xin)(xin)層(ceng)較(jiao)(jiao)薄，冷(leng)鍍(du)鋅(xin)(xin)(xin)(xin)(xin)方(fang)(fang)管(guan)(guan)(guan)(guan)內(nei)壁無(wu)鋅(xin)(xin)(xin)(xin)(xin)層(ceng)附(fu)著。冷(leng)鍍(du)鋅(xin)(xin)(xin)(xin)(xin)方(fang)(fang)管(guan)(guan)(guan)(guan)整(zheng)體(ti)無(wu)鋅(xin)(xin)(xin)(xin)(xin)瘤、結塊等現象，但整(zheng)體(ti)鋅(xin)(xin)(xin)(xin)(xin)層(ceng)較(jiao)(jiao)薄，外(wai)(wai)壁鋅(xin)(xin)(xin)(xin)(xin)層(ceng)厚度在(zai)5μm-10μm。 3.外(wai)(wai)觀區別 熱(re)(re)(re)鍍(du)鋅(xin)(xin)(xin)(xin)(xin)方(fang)(fang)管(guan)(guan)(guan)(guan)外(wai)(wai)表(biao)與冷(leng)鍍(du)鋅(xin)(xin)(xin)(xin)(xin)方(fang)(fang)管(guan)(guan)(guan)(guan)相(xiang)比較(jiao)(jiao)稍微(wei)粗糙。 冷(leng)鍍(du)鋅(xin)(xin)(xin)(xin)(xin)厚壁螺(luo)旋鋼(gang)管(guan)(guan)(guan)(guan)外(wai)(wai)表(biao)比較(jiao)(jiao)光滑、明亮。 4.生(sheng)產工(gong)藝(yi)不同(tong) 熱(re)(re)(re)鍍(du)鋅(xin)(xin)(xin)(xin)(xin)方(fang)(fang)管(guan)(guan)(guan)(guan)：是(shi)在(zai)使用鋼(gang)板或者是(shi)鋼(gang)帶卷曲成(cheng)型(xing)后焊接(jie)制成(cheng)的(de)(de)(de)方(fang)(fang)管(guan)(guan)(guan)(guan)，并在(zai)這種(zhong)(zhong)方(fang)(fang)管(guan)(guan)(guan)(guan)的(de)(de)(de)基礎上(shang)將方(fang)(fang)管(guan)(guan)(guan)(guan)置于熱(re)(re)(re)鍍(du)鋅(xin)(xin)(xin)(xin)(xin)池中(zhong)經(jing)過一(yi)系列(lie)化學反響(xiang)有(you)形成(cheng)的(de)(de)(de)一(yi)種(zhong)(zhong)方(fang)(fang)管(guan)(guan)(guan)(guan)。熱(re)(re)(re)鍍(du)鋅(xin)(xin)(xin)(xin)(xin)方(fang)(fang)管(guan)(guan)(guan)(guan)的(de)(de)(de)生(sheng)產工(gong)藝(yi)較(jiao)(jiao)為簡單，且(qie)生(sheng)產效率是(shi)很(hen)高的(de)(de)(de)，品(pin)種(zhong)(zhong)規格(ge)也(ye)多(duo)，這種(zhong)(zhong)方(fang)(fang)管(guan)(guan)(guan)(guan)所需要的(de)(de)(de)設備和(he)資金很(hen)少，適合小型(xing)鍍(du)鋅(xin)(xin)(xin)(xin)(xin)方(fang)(fang)管(guan)(guan)(guan)(guan)廠家的(de)(de)(de)生(sheng)產。

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