一、管材的分(fen)類 

　　1、按(an)生(sheng)產方法分類 

　　（1）無縫管(guan)(guan)--熱(re)軋管(guan)(guan)、冷軋管(guan)(guan)、冷拔管(guan)(guan)、擠壓管(guan)(guan)、頂管(guan)(guan) 

　　（2）焊管 

　　（a）按工藝分--電(dian)弧焊(han)管、電(dian)阻焊(han)管（高頻(pin)、低(di)頻(pin)）、氣(qi)焊(han)管、爐焊(han)管 

　　（b）按焊縫(feng)(feng)分(fen)--直(zhi)縫(feng)(feng)焊管、螺旋焊管 

　　2、按斷面形狀分(fen)類 

　　（1）簡單斷面鋼(gang)(gang)管(guan)--圓形(xing)(xing)(xing)鋼(gang)(gang)管(guan)、方形(xing)(xing)(xing)鋼(gang)(gang)管(guan)、橢圓形(xing)(xing)(xing)鋼(gang)(gang)管(guan)、三角形(xing)(xing)(xing)鋼(gang)(gang)管(guan)、六角形(xing)(xing)(xing)鋼(gang)(gang)管(guan)、菱形(xing)(xing)(xing)鋼(gang)(gang)管(guan)、八角形(xing)(xing)(xing)鋼(gang)(gang)管(guan)、半(ban)圓形(xing)(xing)(xing)鋼(gang)(gang)圓、其他 

　　（2）復雜斷(duan)面(mian)鋼管--不(bu)等邊六角形(xing)(xing)鋼管、五(wu)瓣梅花形(xing)(xing)鋼管、雙凸形(xing)(xing)鋼管、雙凹形(xing)(xing)鋼管、瓜子形(xing)(xing)鋼管、圓(yuan)錐形(xing)(xing)鋼管、波紋形(xing)(xing)鋼管、表殼鋼管、其他 

　　3、按壁厚分類--薄壁鋼管、厚壁鋼管 

　　4、按用途(tu)分類--管道用鋼(gang)(gang)(gang)(gang)管、熱工(gong)設(she)備用鋼(gang)(gang)(gang)(gang)管、機械(xie)工(gong)業用鋼(gang)(gang)(gang)(gang)管、石(shi)油、地質鉆探用鋼(gang)(gang)(gang)(gang)管、容(rong)器鋼(gang)(gang)(gang)(gang)管、化學工(gong)業用鋼(gang)(gang)(gang)(gang)管、特殊用途(tu)鋼(gang)(gang)(gang)(gang)管、其他 

二、焊(han)接鋼管 

　　焊(han)(han)(han)(han)接(jie)鋼(gang)(gang)管(guan)(guan)(guan)(guan)(guan)(guan)也稱焊(han)(han)(han)(han)管(guan)(guan)(guan)(guan)(guan)(guan)，是用鋼(gang)(gang)板(ban)或鋼(gang)(gang)帶(dai)(dai)經過卷曲成(cheng)型后焊(han)(han)(han)(han)接(jie)制成(cheng)的(de)(de)鋼(gang)(gang)管(guan)(guan)(guan)(guan)(guan)(guan)。焊(han)(han)(han)(han)接(jie)鋼(gang)(gang)管(guan)(guan)(guan)(guan)(guan)(guan)生(sheng)產工藝簡單(dan)，生(sheng)產效率(lv)高(gao)，品種規(gui)(gui)格(ge)多，設備(bei) 資(zi)少，但一般強度低于無縫(feng)鋼(gang)(gang)管(guan)(guan)(guan)(guan)(guan)(guan)。20世紀30年(nian)代(dai)以(yi)來，隨著優質(zhi)帶(dai)(dai)鋼(gang)(gang)連軋生(sheng)產的(de)(de)迅速(su)發(fa)展以(yi)及(ji)焊(han)(han)(han)(han)接(jie)和檢驗技術的(de)(de)進步，焊(han)(han)(han)(han)縫(feng)質(zhi)量不斷提高(gao)，焊(han)(han)(han)(han)接(jie)鋼(gang)(gang)管(guan)(guan)(guan)(guan)(guan)(guan)的(de)(de)品種規(gui)(gui)格(ge)日益增(zeng)多，并(bing)在越(yue)來越(yue)多的(de)(de)領域代(dai)替了無縫(feng)鋼(gang)(gang)管(guan)(guan)(guan)(guan)(guan)(guan)。焊(han)(han)(han)(han)接(jie)鋼(gang)(gang)管(guan)(guan)(guan)(guan)(guan)(guan)按(an)焊(han)(han)(han)(han)縫(feng)的(de)(de)形式分(fen)為直縫(feng)焊(han)(han)(han)(han)管(guan)(guan)(guan)(guan)(guan)(guan)和螺(luo)旋(xuan)焊(han)(han)(han)(han)管(guan)(guan)(guan)(guan)(guan)(guan)。直縫(feng)焊(han)(han)(han)(han)管(guan)(guan)(guan)(guan)(guan)(guan)生(sheng)產工藝簡單(dan)，生(sheng)產效率(lv)高(gao)，成(cheng)本(ben)低，發(fa)展較快。螺(luo)旋(xuan)焊(han)(han)(han)(han)管(guan)(guan)(guan)(guan)(guan)(guan)的(de)(de)強度一般比(bi)直縫(feng)焊(han)(han)(han)(han)管(guan)(guan)(guan)(guan)(guan)(guan)高(gao)，能用較窄(zhai)的(de)(de)坯料生(sheng)產管(guan)(guan)(guan)(guan)(guan)(guan)徑較大的(de)(de)焊(han)(han)(han)(han)管(guan)(guan)(guan)(guan)(guan)(guan)，還可以(yi)用同樣寬度的(de)(de)坯料生(sheng)產管(guan)(guan)(guan)(guan)(guan)(guan)徑不同的(de)(de)焊(han)(han)(han)(han)管(guan)(guan)(guan)(guan)(guan)(guan)。但是與相(xiang)同長(chang)度的(de)(de)直縫(feng)管(guan)(guan)(guan)(guan)(guan)(guan)相(xiang)比(bi)，焊(han)(han)(han)(han)縫(feng)長(chang)度增(zeng)加30~100%，而(er)且(qie)生(sheng)產速(su)度較低。因此(ci)，較小口(kou)徑的(de)(de)焊(han)(han)(han)(han)管(guan)(guan)(guan)(guan)(guan)(guan)大都采用直縫(feng)焊(han)(han)(han)(han)，大口(kou)徑焊(han)(han)(han)(han)管(guan)(guan)(guan)(guan)(guan)(guan)則大多采用螺(luo)旋(xuan)焊(han)(han)(han)(han)。 

　　1.低(di)(di)(di)壓(ya)流體輸(shu)送(song)用(yong)(yong)焊接(jie)(jie)(jie)(jie)鋼(gang)管(guan)(guan)（GB/T3092-1993）也(ye)稱一般(ban)焊管(guan)(guan)，俗稱黑管(guan)(guan)。是用(yong)(yong)于(yu)輸(shu)送(song)水、煤氣、空(kong)氣、油和(he)取(qu)暖蒸汽(qi)等(deng)一般(ban)較低(di)(di)(di)壓(ya)力流體和(he)其(qi)他用(yong)(yong)途的(de)焊接(jie)(jie)(jie)(jie)鋼(gang)管(guan)(guan)。鋼(gang)管(guan)(guan)接(jie)(jie)(jie)(jie)壁厚分(fen)為普通鋼(gang)管(guan)(guan)和(he)加厚鋼(gang)管(guan)(guan)；接(jie)(jie)(jie)(jie)管(guan)(guan)端形式分(fen)為不帶螺(luo)紋鋼(gang)管(guan)(guan)（光(guang)管(guan)(guan)）和(he)帶螺(luo)紋鋼(gang)管(guan)(guan)。鋼(gang)管(guan)(guan)的(de)規格用(yong)(yong)公稱口徑(jing)(jing)（mm）表示(shi)，公稱口徑(jing)(jing)是內徑(jing)(jing)的(de)近似值。習(xi)慣上(shang)常(chang)用(yong)(yong)英寸表示(shi)，如11/2 等(deng)。低(di)(di)(di)壓(ya)流體輸(shu)送(song)用(yong)(yong)焊接(jie)(jie)(jie)(jie)鋼(gang)管(guan)(guan)除直接(jie)(jie)(jie)(jie)用(yong)(yong)于(yu)輸(shu)送(song)流體外，還大量(liang)用(yong)(yong)作低(di)(di)(di)壓(ya)流體輸(shu)送(song)用(yong)(yong)鍍鋅焊接(jie)(jie)(jie)(jie)鋼(gang)管(guan)(guan)的(de)原管(guan)(guan)。 

　　2.低(di)壓流體輸送(song)用鍍(du)鋅(xin)焊(han)接(jie)鋼(gang)管(guan)(guan)（GB/T3091-1993）也稱(cheng)鍍(du)鋅(xin)電焊(han)鋼(gang)管(guan)(guan)，俗稱(cheng)白(bai)管(guan)(guan)。是用于輸送(song)水、煤氣、空氣油(you)及取暖蒸汽、暖水等一般較低(di)壓力流體或(huo)其他用途的熱浸鍍(du)鋅(xin)焊(han)接(jie)（爐焊(han)或(huo)電焊(han)）鋼(gang)管(guan)(guan)。鋼(gang)管(guan)(guan)接(jie)壁(bi)厚(hou)分(fen)為(wei)普通(tong)鍍(du)鋅(xin)鋼(gang)管(guan)(guan)和加厚(hou)鍍(du)鋅(xin)鋼(gang)管(guan)(guan)；接(jie)管(guan)(guan)端(duan)形式(shi)分(fen)為(wei)不帶螺(luo)紋(wen)(wen)鍍(du)鋅(xin)鋼(gang)管(guan)(guan)和帶螺(luo)紋(wen)(wen)鍍(du)鋅(xin)鋼(gang)管(guan)(guan)。鋼(gang)管(guan)(guan)的規格用公(gong)稱(cheng)口徑（mm）表示(shi)，公(gong)稱(cheng)口徑是內徑的近似(si)值。習(xi)慣上常(chang)用英寸表示(shi)，如11/2 等。 

　　3.普通碳素鋼(gang)電線套管(guan)（GB3640-88）是(shi)工業與(yu)民(min)用建筑、安裝(zhuang)機器設備(bei)等電氣安裝(zhuang)工程中用于保護電線的鋼(gang)管(guan)。 

　　4.直(zhi)縫電焊鋼(gang)管(guan)(guan)（YB242-63）是焊縫與鋼(gang)管(guan)(guan)縱(zong)向(xiang)平行的鋼(gang)管(guan)(guan)。通常分為公制電焊鋼(gang)管(guan)(guan)、電焊薄壁管(guan)(guan)、變壓器冷卻(que)油管(guan)(guan)等等。 

　　5.承壓流體(ti)輸(shu)送用(yong)(yong)螺旋縫埋弧焊鋼(gang)管(guan)(guan)（SY5036-83）是以熱軋鋼(gang)帶卷作管(guan)(guan)坯，經常溫螺旋成型，用(yong)(yong)雙面埋弧焊法焊接，用(yong)(yong)于承壓流體(ti)輸(shu)送的螺旋縫鋼(gang)管(guan)(guan)。鋼(gang)管(guan)(guan)承壓能力(li)強，焊接性能好(hao)，經過各種嚴(yan)格(ge)的科學檢(jian)驗和測(ce)試，使用(yong)(yong)安全可(ke)靠。鋼(gang)管(guan)(guan)口(kou)徑大，輸(shu)送效率(lv)高，并可(ke)節約鋪設管(guan)(guan)線(xian)的投資。主要用(yong)(yong)于輸(shu)送石油、天然氣的管(guan)(guan)線(xian)。 

　　6.承(cheng)壓(ya)流體輸送(song)用(yong)(yong)(yong)螺(luo)旋(xuan)縫高(gao)(gao)頻(pin)焊(han)鋼(gang)(gang)(gang)管(guan)(guan)（SY5038-83）是(shi)以熱軋鋼(gang)(gang)(gang)帶(dai)卷作管(guan)(guan)坯，經常溫(wen)螺(luo)旋(xuan)成(cheng)型(xing)，采用(yong)(yong)(yong)高(gao)(gao)頻(pin)搭(da)接(jie)焊(han)法焊(han)接(jie)的，用(yong)(yong)(yong)于承(cheng)壓(ya)流體輸送(song)的螺(luo)旋(xuan)縫高(gao)(gao)頻(pin)焊(han)鋼(gang)(gang)(gang)管(guan)(guan)。鋼(gang)(gang)(gang)管(guan)(guan)承(cheng)壓(ya)能力強，塑性(xing)好，便(bian)于焊(han)接(jie)和(he)加工成(cheng)型(xing)；經過各(ge)種(zhong)嚴格(ge)和(he)科學檢驗(yan)和(he)測試，使用(yong)(yong)(yong)安全可靠，鋼(gang)(gang)(gang)管(guan)(guan)口徑大(da)，輸送(song)效率高(gao)(gao)，并可節省鋪設管(guan)(guan)線(xian)的投資。主要用(yong)(yong)(yong)于鋪設輸送(song)石油、天然(ran)氣(qi)等的管(guan)(guan)線(xian)。 

　　7.一般(ban)低壓流體輸(shu)送用(yong)螺旋縫埋弧(hu)焊鋼管(guan)（SY5037-83）是以熱軋鋼帶(dai)卷(juan)作管(guan)坯，經常溫螺旋成型，采(cai)用(yong)雙面自動埋弧(hu)焊或(huo)單面焊法(fa)制成的用(yong)于水、煤氣(qi)(qi)、空(kong)氣(qi)(qi)和(he)蒸汽等一般(ban)低壓流體輸(shu)送用(yong)埋弧(hu)焊鋼管(guan)。 

　　8.一(yi)般(ban)低(di)壓流體輸(shu)送用(yong)(yong)螺(luo)(luo)旋(xuan)(xuan)縫(feng)高頻(pin)焊(han)鋼(gang)管(guan)（SY5039-83）是(shi)以熱(re)軋鋼(gang)帶卷作管(guan)坯，經常溫(wen)螺(luo)(luo)旋(xuan)(xuan)成型，采用(yong)(yong)高頻(pin)搭接(jie)焊(han)法焊(han)接(jie)用(yong)(yong)于一(yi)般(ban)低(di)壓流體輸(shu)送用(yong)(yong)螺(luo)(luo)旋(xuan)(xuan)縫(feng)高頻(pin)焊(han)鋼(gang)管(guan)。 

　　9．樁(zhuang)用螺(luo)旋焊縫鋼管（SY5040-83）是(shi)以熱軋鋼帶卷作管坯，經常溫螺(luo)旋成型(xing)，采用雙面埋(mai)弧焊接(jie)或高頻(pin)焊接(jie)制(zhi)成的(de)，用于土木建筑結構、碼頭、橋梁等基(ji)礎樁(zhuang)用鋼管。 

三、無縫(feng)鋼管 

　　是(shi)(shi)一(yi)(yi)種(zhong)具(ju)(ju)有(you)中(zhong)空截(jie)(jie)面(mian)(mian)、周邊沒有(you)接縫的(de)(de)長條鋼(gang)(gang)(gang)(gang)(gang)材(cai)。鋼(gang)(gang)(gang)(gang)(gang)管(guan)(guan)(guan)具(ju)(ju)有(you)中(zhong)空截(jie)(jie)面(mian)(mian)，大量用(yong)作輸送(song)流體(ti)的(de)(de)管(guan)(guan)(guan)道，如輸送(song)石油、天然氣、煤氣、水及某些固體(ti)物(wu)料(liao)的(de)(de)管(guan)(guan)(guan)道等(deng)(deng)。鋼(gang)(gang)(gang)(gang)(gang)管(guan)(guan)(guan)與圓(yuan)(yuan)(yuan)鋼(gang)(gang)(gang)(gang)(gang)等(deng)(deng)實心鋼(gang)(gang)(gang)(gang)(gang)材(cai)相比，在抗(kang)彎(wan)(wan)抗(kang)扭強(qiang)度相同(tong)時(shi)，重量較輕(qing)，是(shi)(shi)一(yi)(yi)種(zhong)經濟截(jie)(jie)面(mian)(mian)鋼(gang)(gang)(gang)(gang)(gang)材(cai)，廣(guang)泛用(yong)于(yu)制(zhi)(zhi)造結構件和(he)機(ji)械(xie)零(ling)件，如石油鉆桿、汽車傳動軸、自行車架以及建筑施工(gong)中(zhong)用(yong)的(de)(de)鋼(gang)(gang)(gang)(gang)(gang)腳手(shou)架等(deng)(deng)。用(yong)鋼(gang)(gang)(gang)(gang)(gang)管(guan)(guan)(guan)制(zhi)(zhi)造環形(xing)零(ling)件，可(ke)提(ti)高材(cai)料(liao)利用(yong)率，簡(jian)化制(zhi)(zhi)造工(gong)序，節約材(cai)料(liao)和(he)加工(gong)工(gong)時(shi)，如滾動軸承套圈(quan)、千斤頂套等(deng)(deng)，目前已廣(guang)泛用(yong)鋼(gang)(gang)(gang)(gang)(gang)管(guan)(guan)(guan)來(lai)制(zhi)(zhi)造。鋼(gang)(gang)(gang)(gang)(gang)管(guan)(guan)(guan)還是(shi)(shi)各種(zhong)常(chang)規(gui)武器不(bu)(bu)可(ke)缺少(shao)的(de)(de)材(cai)料(liao)，槍管(guan)(guan)(guan)、炮筒等(deng)(deng)都要(yao)鋼(gang)(gang)(gang)(gang)(gang)管(guan)(guan)(guan)來(lai)制(zhi)(zhi)造。鋼(gang)(gang)(gang)(gang)(gang)管(guan)(guan)(guan)按橫截(jie)(jie)面(mian)(mian)積形(xing)狀的(de)(de)不(bu)(bu)同(tong)可(ke)分為圓(yuan)(yuan)(yuan)管(guan)(guan)(guan)和(he)異型(xing)管(guan)(guan)(guan)。由于(yu)在周長相等(deng)(deng)的(de)(de)條件下，圓(yuan)(yuan)(yuan)面(mian)(mian)積最大，用(yong)圓(yuan)(yuan)(yuan)形(xing)管(guan)(guan)(guan)可(ke)以輸送(song)更多(duo)的(de)(de)流體(ti)。此(ci)外，圓(yuan)(yuan)(yuan)環截(jie)(jie)面(mian)(mian)在承受內部或外部徑(jing)向壓(ya)力時(shi)，受力較均勻，因此(ci)，絕大多(duo)數(shu)鋼(gang)(gang)(gang)(gang)(gang)管(guan)(guan)(guan)是(shi)(shi)圓(yuan)(yuan)(yuan)管(guan)(guan)(guan)。但是(shi)(shi)，圓(yuan)(yuan)(yuan)管(guan)(guan)(guan)也有(you)一(yi)(yi)定(ding)的(de)(de)局限性，如在受平面(mian)(mian)彎(wan)(wan)曲的(de)(de)條件下，圓(yuan)(yuan)(yuan)管(guan)(guan)(guan)就不(bu)(bu)如方、矩(ju)形(xing)管(guan)(guan)(guan)抗(kang)彎(wan)(wan)強(qiang)度大，一(yi)(yi)些農機(ji)具(ju)(ju)骨架、鋼(gang)(gang)(gang)(gang)(gang)木家具(ju)(ju)等(deng)(deng)就常(chang)用(yong)方、矩(ju)形(xing)管(guan)(guan)(guan)。根據不(bu)(bu)同(tong)用(yong)途還需有(you)其他截(jie)(jie)面(mian)(mian)形(xing)狀的(de)(de)異型(xing)鋼(gang)(gang)(gang)(gang)(gang)管(guan)(guan)(guan)。 

　　1.結構(gou)(gou)用(yong)無縫(feng)(feng)鋼管（GB/T8162-1999）是(shi)用(yong)于一(yi)般結構(gou)(gou)和機械結構(gou)(gou)的(de)無縫(feng)(feng)鋼管。 

　　2.流體(ti)輸(shu)送(song)用無縫鋼管(guan)（GB/T8163-1999）是用于輸(shu)送(song)水、油、氣(qi)等(deng)流體(ti)的一般(ban)無縫鋼管(guan)。 

　　3.低(di)(di)中壓鍋(guo)爐用(yong)(yong)無縫鋼管(guan)（GB3087-1999）是用(yong)(yong)于(yu)制造各種(zhong)結(jie)構(gou)低(di)(di)中壓鍋(guo)爐過熱蒸汽(qi)管(guan)、沸水管(guan)及機(ji)車鍋(guo)爐用(yong)(yong)過熱蒸汽(qi)管(guan)、大煙管(guan)、小煙管(guan)和(he)拱(gong)磚管(guan)用(yong)(yong)的優質碳(tan)素結(jie)構(gou)鋼熱軋(ya)和(he)冷拔（軋(ya)）無縫鋼管(guan)。 

　　4.高壓鍋爐(lu)用(yong)無(wu)(wu)縫鋼管(guan)（GB5310-1995）是用(yong)于制(zhi)造(zao)高壓及其以上壓力的水(shui)管(guan)鍋爐(lu)受熱面用(yong)的優質(zhi)碳素鋼、合(he)金鋼和(he)不銹耐熱鋼無(wu)(wu)縫鋼管(guan)。 

　　5.化肥設備用(yong)高壓無縫(feng)鋼管（GB6479-86）是適用(yong)于工作溫度為-40~400℃、工作壓力為10~30Ma的化工設備和(he)管道的優質碳素結構(gou)鋼和(he)合金鋼無縫(feng)鋼管。 

　　6.石油裂化用無(wu)縫鋼(gang)管(guan)(guan)（GB9948-88）是適用于石油精煉廠的(de)爐管(guan)(guan)、熱交換(huan)器和(he)管(guan)(guan)道無(wu)縫鋼(gang)管(guan)(guan)。 

　　7.地(di)質鉆探用鋼管(guan)（YB235-70）是供地(di)質部門進行巖(yan)心(xin)(xin)鉆探使用的鋼管(guan)，按用途可分為(wei)鉆桿、鉆鋌(ting)、巖(yan)心(xin)(xin)管(guan)、套(tao)管(guan)和沉(chen)淀管(guan)等。 

　　8.金剛(gang)石巖芯(xin)鉆探用(yong)無縫(feng)鋼管（GB3423-82）是用(yong)于金剛(gang)石巖芯(xin)鉆探的(de)鉆桿、巖心桿、套管的(de)無縫(feng)鋼管。 

　　9.石油鉆(zhan)(zhan)探管（YB528-65）是用(yong)(yong)于石油鉆(zhan)(zhan)探兩(liang)端(duan)內加(jia)厚或外(wai)加(jia)厚的(de)無縫鋼管。鋼管分(fen)車絲(si)(si)和(he)不車絲(si)(si)兩(liang)種，車絲(si)(si)管用(yong)(yong)接(jie)頭(tou)聯(lian)結，不車 絲(si)(si)管用(yong)(yong)對焊的(de)方法與工具接(jie)頭(tou)聯(lian)結。 

　　10.船舶(bo)用(yong)(yong)碳鋼(gang)(gang)(gang)無(wu)(wu)(wu)縫鋼(gang)(gang)(gang)管(guan)（GB5213-85）是制造船舶(bo)I級耐壓(ya)管(guan)系、Ⅱ級耐壓(ya)管(guan)系、鍋(guo)爐及(ji)過熱器用(yong)(yong)的碳素鋼(gang)(gang)(gang)無(wu)(wu)(wu)縫鋼(gang)(gang)(gang)管(guan)。碳素鋼(gang)(gang)(gang)無(wu)(wu)(wu)縫鋼(gang)(gang)(gang)管(guan)管(guan)壁(bi)工(gong)作(zuo)溫度不超過450℃，合金(jin)鋼(gang)(gang)(gang)無(wu)(wu)(wu)縫鋼(gang)(gang)(gang)管(guan)管(guan)壁(bi)工(gong)作(zuo)溫度超過450℃。 

　　11.汽(qi)(qi)車(che)半軸套管用無縫(feng)鋼管（GB3088-82）是(shi)制造汽(qi)(qi)車(che)半軸套管及驅動橋橋殼軸管用的優(you)質(zhi)碳素結(jie)構鋼和合金結(jie)構鋼熱(re)軋無縫(feng)鋼管。 

　　12.柴油(you)機(ji)用(yong)高壓(ya)油(you)管(guan)（GB3093-86）是(shi)制造(zao)柴油(you)機(ji)噴(pen)射系統高壓(ya)管(guan)用(yong)的冷拔無縫鋼管(guan)。 

　　13.液(ye)壓和氣動缸筒(tong)用精密內徑(jing)無縫(feng)鋼管（GB8713-88）是制(zhi)造液(ye)壓和氣動缸筒(tong)用的具有精密內徑(jing)尺寸的冷(leng)拔或冷(leng)軋精密無縫(feng)鋼管。 

　　14.冷(leng)拔或冷(leng)軋(ya)精密無縫(feng)鋼管（GB3639-83）是用于機械結(jie)構(gou)(gou)、液壓(ya)設(she)備的尺寸(cun)精度高和(he)表面光潔(jie)度好的冷(leng)拔或冷(leng)軋(ya)精密無縫(feng)鋼管。選用精密無縫(feng)鋼管制(zhi)造機械結(jie)構(gou)(gou)或液壓(ya)設(she)備等，可以大(da)大(da)節約(yue)機械加工(gong)工(gong)時(shi)，提(ti)高材料利用率，同(tong)時(shi)有利于提(ti)高產品質(zhi)量。 

　　15.結構用(yong)不銹(xiu)鋼(gang)無縫鋼(gang)管（GB/T14975-1994）是廣泛用(yong)于化工、石油、輕紡、醫療、食品、機械(xie)等工業的耐腐蝕管道和結構件(jian)及零件(jian)的不銹(xiu)鋼(gang)制成的熱(re)軋（擠、擴）和冷拔（軋）無縫鋼(gang)管。 

　　16.流體輸送用不銹鋼(gang)(gang)無(wu)縫(feng)鋼(gang)(gang)管(guan)（GB/T14976-1994）是用于輸送流體的不銹鋼(gang)(gang)制成的熱軋（擠、擴）和冷(leng)拔(ba)（軋）無(wu)縫(feng)鋼(gang)(gang)管(guan)。 

　　17.異(yi)型無(wu)(wu)縫(feng)鋼(gang)管(guan)是(shi)除了圓(yuan)管(guan)以(yi)外(wai)的(de)其他(ta)截(jie)面(mian)形狀的(de)無(wu)(wu)縫(feng)鋼(gang)管(guan)的(de)總稱。按鋼(gang)管(guan)截(jie)面(mian)形狀尺寸的(de)不同又可分為(wei)(wei)等壁厚異(yi)型無(wu)(wu)縫(feng)鋼(gang)管(guan)（代號(hao)為(wei)(wei)D）、不等壁厚異(yi)型無(wu)(wu)縫(feng)鋼(gang)管(guan)（代號(hao)為(wei)(wei)BD）、變直徑(jing)異(yi)型無(wu)(wu)縫(feng)鋼(gang)管(guan)（代號(hao)為(wei)(wei)BJ）。異(yi)型無(wu)(wu)縫(feng)鋼(gang)管(guan)廣泛用于(yu)各(ge)種結(jie)構件、工具和機械零部件。和圓(yuan)管(guan)相比，異(yi)型管(guan)一般(ban)都有較大的(de)慣性矩和截(jie)面(mian)模數，有較大的(de)抗(kang)(kang)彎抗(kang)(kang)扭(niu)能力，可以(yi)大大減輕(qing)結(jie)構重(zhong)量(liang)，節約鋼(gang)材。 

四(si)、鋼塑復合管、大口徑涂敷鋼管 

　　鋼塑復合管(guan)(guan)以(yi)熱浸鍍(du)(du)鋅(xin)鋼管(guan)(guan)作基體，經(jing)粉末熔融噴涂技術在內壁（需要(yao)時外壁亦可）涂敷塑料而成(cheng)，性能優異。與鍍(du)(du)鋅(xin)管(guan)(guan)相比(bi)，具有(you)抗(kang)腐蝕、不(bu)生(sheng)銹、不(bu)積垢、光滑流暢(chang)、清(qing)潔無(wu)毒，使(shi)用(yong)(yong)壽命(ming)長等(deng)優點。據測(ce)試，鋼塑復合管(guan)(guan)的使(shi)用(yong)(yong)壽命(ming)為鍍(du)(du)鋅(xin)管(guan)(guan)的三(san)倍以(yi)上(shang)。與塑料管(guan)(guan)相比(bi)，具有(you)機(ji)械(xie)強度高(gao)，耐壓(ya)、耐熱性好等(deng)優點。由(you)于(yu)基體是(shi)鋼管(guan)(guan)，所以(yi)不(bu)存在脆化、老化問題。可廣泛應(ying)用(yong)(yong)于(yu)自來(lai)水、煤氣、化工(gong)產品(pin)等(deng)流體輸送及取暖工(gong)程(cheng)，是(shi)鍍(du)(du)鋅(xin)管(guan)(guan)的升級換代產品(pin)。由(you)于(yu)其安裝使(shi)用(yong)(yong)方法與傳統的鍍(du)(du)鋅(xin)管(guan)(guan)基本相同，管(guan)(guan)件形(xing)式也完全(quan)相同，而且能代替鋁塑復合管(guan)(guan)在大(da)口徑自來(lai)水輸送上(shang)發(fa)揮作用(yong)(yong)，深受用(yong)(yong)戶歡迎，已成(cheng)為管(guan)(guan)道市場最具競爭力的新產品(pin)之一。 

　　涂(tu)(tu)敷(fu)鋼管(guan)(guan)是在大口(kou)徑(jing)螺旋焊(han)管(guan)(guan)和高頻焊(han)管(guan)(guan)基礎上涂(tu)(tu)敷(fu)塑料而(er)成，最大管(guan)(guan)口(kou)直(zhi)徑(jing)達1200mm，可根據不(bu)同的需要涂(tu)(tu)敷(fu)聚(ju)氯乙烯（PVC）、聚(ju)乙烯（PE）、環(huan)氧樹(shu)脂（EPOZY）等(deng)各種不(bu)同性(xing)能的塑料涂(tu)(tu)層(ceng)，附(fu)著(zhu)力(li)(li)好(hao)，抗(kang)腐(fu)蝕(shi)性(xing)強，可耐(nai)強酸、強堿及其它化(hua)學(xue)腐(fu)蝕(shi)，無(wu)毒、不(bu)銹蝕(shi)、耐(nai)磨、耐(nai)沖擊、耐(nai)滲透性(xing)強，管(guan)(guan)道表面光滑，不(bu)粘(zhan)附(fu)任何物質，能降低輸送(song)時的阻力(li)(li)，提高流量及輸送(song)效率，減少輸送(song)壓(ya)力(li)(li)損失。涂(tu)(tu)層(ceng)中無(wu)溶劑，無(wu)可滲出物質，因(yin)而(er)不(bu)會(hui)污染所輸送(song)的介質，從而(er)保證流體(ti)的純潔度(du)和衛生(sheng)性(xing)，在-40℃到(dao)+80℃范(fan)圍可冷熱循環(huan)交替(ti)使(shi)用(yong)(yong)，不(bu)老化(hua)、不(bu)龜裂，因(yin)而(er)可以在寒冷地帶(dai)等(deng)苛刻的環(huan)境下使(shi)用(yong)(yong)。大口(kou)徑(jing)涂(tu)(tu)敷(fu)鋼管(guan)(guan)廣泛應用(yong)(yong)于自來水、天然(ran)氣、石油(you)、化(hua)工(gong)、醫藥、通訊(xun)、電力(li)(li)、海洋(yang)等(deng)工(gong)程(cheng)領域。