无(wu)(wu)缝(feng)(feng)钢(gang)(gang)(gang)(gang)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)是由整支圆(yuan)钢(gang)(gang)(gang)(gang)穿孔而成的，表面上没(mei)有(you)焊(han)缝(feng)(feng)的钢(gang)(gang)(gang)(gang)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)，称之为无(wu)(wu)缝(feng)(feng)钢(gang)(gang)(gang)(gang)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)。根据生产方(fang)法，无(wu)(wu)缝(feng)(feng)钢(gang)(gang)(gang)(gang)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)可分(fen)(fen)热轧无(wu)(wu)缝(feng)(feng)钢(gang)(gang)(gang)(gang)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)、冷轧无(wu)(wu)缝(feng)(feng)钢(gang)(gang)(gang)(gang)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)、冷拔无(wu)(wu)缝(feng)(feng)钢(gang)(gang)(gang)(gang)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)、挤压无(wu)(wu)缝(feng)(feng)钢(gang)(gang)(gang)(gang)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)、顶管(guan)(guan)(guan)(guan)(guan)(guan)(guan)等(deng)。按照(zhao)断面形(xing)(xing)(xing)状(zhuang)，无(wu)(wu)缝(feng)(feng)钢(gang)(gang)(gang)(gang)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)分(fen)(fen)圆(yuan)形(xing)(xing)(xing)和异(yi)形(xing)(xing)(xing)两种(zhong)，异(yi)形(xing)(xing)(xing)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)有(you)方(fang)形(xing)(xing)(xing)、椭圆(yuan)形(xing)(xing)(xing)、三角(jiao)形(xing)(xing)(xing)、六角(jiao)形(xing)(xing)(xing)、瓜子(zi)形(xing)(xing)(xing)、星形(xing)(xing)(xing)、 带翅管(guan)(guan)(guan)(guan)(guan)(guan)(guan)多种(zhong)复杂形(xing)(xing)(xing)状(zhuang)。****直径达900mm，最小直径为 4mm。根据用(yong)途不(bu)同， 有(you)厚(hou)壁无(wu)(wu)缝(feng)(feng)钢(gang)(gang)(gang)(gang)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)和薄壁无(wu)(wu)缝(feng)(feng)钢(gang)(gang)(gang)(gang)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)。无(wu)(wu)缝(feng)(feng)钢(gang)(gang)(gang)(gang)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)主要用(yong)做石(shi)油地质钻探管(guan)(guan)(guan)(guan)(guan)(guan)(guan)、石(shi)油化(hua)工(gong)用(yong)的裂化(hua)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)、锅 炉管(guan)(guan)(guan)(guan)(guan)(guan)(guan)、轴承(cheng)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)以及汽车、拖拉机(ji)、航(hang)空用(yong)高精(jing)度结构钢(gang)(gang)(gang)(gang)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)。

分类

沿其横截面的(de)周边上无接缝的(de)钢管(guan)。根据(ju)生产方法(fa)不同分为热轧管(guan)、冷轧管(guan)、冷拔管(guan)、挤压管(guan)、顶管(guan)等，均(jun)有(you)各(ge)自工艺规定。

材(cai)质(zhi)有普通(tong)和优质(zhi)碳素结构(gou)钢(gang)(gang)(gang)（Q215-A～Q275-A和10～50号钢(gang)(gang)(gang)）、低(di)合(he)金钢(gang)(gang)(gang)（09MnV、16Mn等）、合(he)金钢(gang)(gang)(gang)、不锈耐酸钢(gang)(gang)(gang)等。

按用途(tu)分为一般用途(tu)的（用于(yu)(yu)输水、气管道和(he)结(jie)构(gou)件、机械零件）和(he)专(zhuan)用的（用于(yu)(yu)锅炉、地(di)质勘探、轴承、耐酸(suan)等）两类。

无缝钢管用途很(hen)广(guang)泛(fan)。

1、一般用途的无缝(feng)钢(gang)(gang)管(guan)由(you)普通(tong)的碳(tan)素结(jie)构钢(gang)(gang)、低合(he)金(jin)结(jie)构钢(gang)(gang)或合(he)金(jin)结(jie)构钢(gang)(gang)轧制，产(chan)量最多，主(zhu)要(yao)用作输送(song)流体的管(guan)道(dao)或结(jie)构零件。

2、根据(ju)用途不同分三类供应(ying)：

a、按化(hua)学成(cheng)分和机械性能供应；

b、按机械性能供应；

c、按水压试验供应(ying)。按a、b类(lei)供应(ying)的钢管，如用于(yu)承受(shou)液(ye)体(ti)压力，也要进行水压试验。

3、专(zhuan)门用(yong)(yong)途的无(wu)缝(feng)管有锅炉(lu)用(yong)(yong)无(wu)缝(feng)管、化工电力用(yong)(yong)，地质用(yong)(yong)无(wu)缝(feng)钢(gang)管及石油用(yong)(yong)无(wu)缝(feng)管等多(duo)种。

无缝钢(gang)管(guan)具有(you)中空截面，大量(liang)用(yong)作(zuo)输送流体(ti)的(de)管(guan)道(dao)，如输送石油、天(tian)然气、煤气、水(shui)及某些(xie)固体(ti)物料的(de)管(guan)道(dao)等。钢(gang)管(guan)与圆(yuan)钢(gang)等实心(xin)钢(gang)材(cai)相(xiang)比，在抗弯抗扭强(qiang)度相(xiang)同时，重量(liang)较(jiao)轻，是一种经济截面钢(gang)材(cai)。

广(guang)泛用(yong)(yong)于制(zhi)造(zao)(zao)结构件(jian)和机(ji)械(xie)零件(jian)，如石油(you)钻(zuan)杆、汽车(che)(che)传(chuan)动(dong)轴、自行车(che)(che)架(jia)以(yi)及(ji)建筑施工(gong)中用(yong)(yong)的钢脚手架(jia)等(deng)用(yong)(yong)钢管制(zhi)造(zao)(zao)环形零件(jian)，可(ke)提高(gao)材(cai)料利用(yong)(yong)率，简化制(zhi)造(zao)(zao)工(gong)序，节约材(cai)料和加工(gong)工(gong)时，已广(guang)泛用(yong)(yong)钢管来制(zhi)造(zao)(zao)。