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不(bu)(bu)(bu)(bu)(bu)(bu)銹(xiu)(xiu)(xiu)鋼(gang)(gang)(gang)，即(ji)耐(nai)空(kong)氣(qi)、蒸汽、水等(deng)弱腐(fu)蝕介質(zhi)和(he)酸(suan)、堿、鹽等(deng)化(hua)(hua)(hua)學侵蝕性(xing)(xing)(xing)介質(zhi)腐(fu)蝕鋼(gang)(gang)(gang)的統稱。不(bu)(bu)(bu)(bu)(bu)(bu)銹(xiu)(xiu)(xiu)鋼(gang)(gang)(gang)所含(han)(han)的鉻(ge)合金元(yuan)素會與(yu)腐(fu)蝕介質(zhi)中氧(yang)(yang)氣(qi)、氧(yang)(yang)化(hua)(hua)(hua)劑反(fan)應，反(fan)應后在(zai)鋼(gang)(gang)(gang)表(biao)面形(xing)(xing)成(cheng)一(yi)(yi)層自(zi)鈍化(hua)(hua)(hua)氧(yang)(yang)化(hua)(hua)(hua)膜Cr2O3，該(gai)氧(yang)(yang)化(hua)(hua)(hua)膜可(ke)阻止鋼(gang)(gang)(gang)基體進一(yi)(yi)步腐(fu)蝕，且這(zhe)層鉻(ge)氧(yang)(yang)化(hua)(hua)(hua)膜在(zai)空(kong)氣(qi)或(huo)(huo)水中可(ke)立即(ji)形(xing)(xing)成(cheng)，甚至能(neng)在(zai)劃傷(shang)或(huo)(huo)損(sun)壞后自(zi)行修復(fu)。  不(bu)(bu)(bu)(bu)(bu)(bu)銹(xiu)(xiu)(xiu)鋼(gang)(gang)(gang)按基體組織分為(wei)鐵素體、馬(ma)氏(shi)體、奧氏(shi)體等(deng)，按成(cheng)分分為(wei)析出硬化(hua)(hua)(hua)系(xi)(xi)(SUS600)、Cr 系(xi)(xi)(SUS400)、Cr-Ni 系(xi)(xi)(SUS300)及 Cr-Mn-Ni(SUS200)。  不(bu)(bu)(bu)(bu)(bu)(bu)銹(xiu)(xiu)(xiu)鋼(gang)(gang)(gang)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)材(cai)(cai)、管(guan)(guan)(guan)(guan)(guan)(guan)(guan)件經(jing)(jing)除雜質(zhi)、酸(suan)洗、鈍化(hua)(hua)(hua)工(gong)(gong)藝(yi)處(chu)理后，可(ke)使生(sheng)成(cheng)的 Cr2O3鈍化(hua)(hua)(hua)氧(yang)(yang)化(hua)(hua)(hua)膜厚(hou)度增(zeng)加(jia)且致(zhi)密性(xing)(xing)(xing)均(jun)勻(yun)增(zeng)強；當不(bu)(bu)(bu)(bu)(bu)(bu)銹(xiu)(xiu)(xiu)鋼(gang)(gang)(gang)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)件經(jing)(jing)精光(guang)(guang)工(gong)(gong)藝(yi)處(chu)理、不(bu)(bu)(bu)(bu)(bu)(bu)銹(xiu)(xiu)(xiu)鋼(gang)(gang)(gang)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)經(jing)(jing)拋(pao)光(guang)(guang)處(chu)理后，不(bu)(bu)(bu)(bu)(bu)(bu)僅(jin)能(neng)表(biao)面缺陷，還(huan)使鈍化(hua)(hua)(hua)膜更為(wei)細(xi)膩、致(zhi)密，以(yi)減少(shao)點(dian)(dian)腐(fu)蝕的概率。同時，管(guan)(guan)(guan)(guan)(guan)(guan)(guan)件精光(guang)(guang)后內壁(bi)光(guang)(guang)潔、摩(mo)阻小(xiao)，從而節(jie)約(yue)能(neng)耗。所以(yi)，不(bu)(bu)(bu)(bu)(bu)(bu)銹(xiu)(xiu)(xiu)鋼(gang)(gang)(gang)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)不(bu)(bu)(bu)(bu)(bu)(bu)僅(jin)具(ju)有(you)強度高，抗(kang)腐(fu)蝕性(xing)(xing)(xing)能(neng)強、韌(ren)性(xing)(xing)(xing)好的優點(dian)(dian)，還(huan)具(ju)有(you)抗(kang)振動(dong)沖擊和(he)抗(kang)震、低溫(wen)不(bu)(bu)(bu)(bu)(bu)(bu)變脆(cui)、經(jing)(jing)久耐(nai)用(yong)(yong)又可(ke)再生(sheng)利用(yong)(yong)做裝(zhuang)潢(huang)材(cai)(cai)料(liao)的特(te)點(dian)(dian)，被越來越廣泛的應用(yong)(yong)在(zai)建筑(zhu)或(huo)(huo)安裝(zhuang)材(cai)(cai)料(liao)中。  GB/T12771-2008 規定，薄壁(bi)不(bu)(bu)(bu)(bu)(bu)(bu)銹(xiu)(xiu)(xiu)鋼(gang)(gang)(gang)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)是指壁(bi)厚(hou)與(yu)外徑比不(bu)(bu)(bu)(bu)(bu)(bu)大于 3%的不(bu)(bu)(bu)(bu)(bu)(bu)銹(xiu)(xiu)(xiu)鋼(gang)(gang)(gang)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)，目前行業使用(yong)(yong)的薄壁(bi)不(bu)(bu)(bu)(bu)(bu)(bu)銹(xiu)(xiu)(xiu)鋼(gang)(gang)(gang)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)要(yao)求壁(bi)厚(hou)不(bu)(bu)(bu)(bu)(bu)(bu)小(xiao)于 0.6mm，一(yi)(yi)般為(wei) 0.6mm～2mm，一(yi)(yi)般是由鋼(gang)(gang)(gang)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)經(jing)(jing)輾壓、卷制后通常采用(yong)(yong)自(zi)動(dong)氬(ya)弧焊(han)(han)等(deng)熔(rong)焊(han)(han)焊(han)(han)接(jie)工(gong)(gong)藝(yi)焊(han)(han)接(jie)而成(cheng)。建筑(zhu)用(yong)(yong)薄壁(bi)不(bu)(bu)(bu)(bu)(bu)(bu)銹(xiu)(xiu)(xiu)鋼(gang)(gang)(gang)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)材(cai)(cai)和(he)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)件含(han)(han)鉻(ge)（Cr）量一(yi)(yi)般在(zai) 12%以(yi)上(shang)，并(bing)按需(xu)要(yao)添加(jia)其(qi)他金屬(shu)元(yuan)素形(xing)(xing)成(cheng)奧氏(shi)體晶體結構(gou)。經(jing)(jing)研究證(zheng)明，添加(jia)鎳（Ni）元(yuan)素可(ke)提高材(cai)(cai)料(liao)的延展(zhan)性(xing)(xing)(xing)和(he)韌(ren)性(xing)(xing)(xing)，使加(jia)工(gong)(gong)易成(cheng)型，宜彎曲(qu)；減少(shao)碳（C）含(han)(han)量，可(ke)提高材(cai)(cai)料(liao)的焊(han)(han)接(jie)性(xing)(xing)(xing)能(neng)；添加(jia)鉬（Mo）或(huo)(huo)錳(meng)（Mn）等(deng)元(yuan)素的含(han)(han)量，可(ke)提高材(cai)(cai)料(liao)的耐(nai)點(dian)(dian)蝕和(he)耐(nai)縫蝕的性(xing)(xing)(xing)能(neng)。