黄色视频三级

可分為無縫鋼(gang)管(guan)(guan)(guan)和(he)有(you)縫鋼(gang)管(guan)(guan)(guan)，有(you)縫鋼(gang)管(guan)(guan)(guan)簡稱為直縫鋼(gang)管(guan)(guan)(guan)。無縫鋼(gang)管(guan)(guan)(guan)可用(yong)于(yu)各種(zhong)行(xing)業(ye)的液體氣壓(ya)管(guan)(guan)(guan)道(dao)(dao)和(he)氣體管(guan)(guan)(guan)道(dao)(dao)等(deng)。焊(han)接管(guan)(guan)(guan)道(dao)(dao)可用(yong)于(yu)輸水管(guan)(guan)(guan)道(dao)(dao)、煤氣管(guan)(guan)(guan)道(dao)(dao)、暖氣管(guan)(guan)(guan)道(dao)(dao)、電器管(guan)(guan)(guan)道(dao)(dao)等(deng)。

按鋼管用途分

1、管(guan)(guan)(guan)(guan)道(dao)用管(guan)(guan)(guan)(guan)。如：水、煤氣(qi)管(guan)(guan)(guan)(guan)、蒸汽管(guan)(guan)(guan)(guan)道(dao)用無縫管(guan)(guan)(guan)(guan)、石油輸送管(guan)(guan)(guan)(guan)、石油天然氣(qi)干線用管(guan)(guan)(guan)(guan)。農業灌溉(gai)用水龍頭帶管(guan)(guan)(guan)(guan)和(he)噴灌用管(guan)(guan)(guan)(guan)等。

2、熱工設備用管(guan)(guan)。如一般鍋(guo)(guo)爐(lu)用的(de)沸水(shui)管(guan)(guan)、過(guo)熱蒸汽管(guan)(guan)，機(ji)車鍋(guo)(guo)爐(lu)用的(de)過(guo)熱管(guan)(guan)、大煙管(guan)(guan)、小煙管(guan)(guan)、拱磚管(guan)(guan)以(yi)及高溫高壓鍋(guo)(guo)爐(lu)管(guan)(guan)等。

3、機械工業(ye)用管(guan)(guan)(guan)(guan)。如航空結(jie)構管(guan)(guan)(guan)(guan)（圓(yuan)管(guan)(guan)(guan)(guan)、橢圓(yuan)管(guan)(guan)(guan)(guan)、平橢圓(yuan)管(guan)(guan)(guan)(guan)），汽(qi)車半(ban)軸管(guan)(guan)(guan)(guan)、車軸管(guan)(guan)(guan)(guan)、汽(qi)車拖(tuo)拉機結(jie)構管(guan)(guan)(guan)(guan)、拖(tuo)拉機的油(you)冷卻器用管(guan)(guan)(guan)(guan)、農機用方形(xing)管(guan)(guan)(guan)(guan)與矩(ju)形(xing)管(guan)(guan)(guan)(guan)、變壓器用管(guan)(guan)(guan)(guan)以及(ji)軸承用管(guan)(guan)(guan)(guan)等。

4、石油(you)(you)地質(zhi)鉆(zhan)探用管(guan)(guan)。如：石油(you)(you)鉆(zhan)探管(guan)(guan)、石油(you)(you)鉆(zhan)桿(gan)（方鉆(zhan)桿(gan)與六角鉆(zhan)桿(gan)）、鉆(zhan)挺(ting)、石油(you)(you)油(you)(you)管(guan)(guan)、石油(you)(you)套(tao)管(guan)(guan)及各種管(guan)(guan)接頭、地質(zhi)鉆(zhan)探管(guan)(guan)（巖(yan)心管(guan)(guan)、套(tao)管(guan)(guan)、主動鉆(zhan)桿(gan)、鉆(zhan)挺(ting)、按(an)箍及銷接頭等）。

5、化(hua)學工業(ye)用管(guan)(guan)。如：石油裂化(hua)管(guan)(guan)，化(hua)工設備熱交(jiao)換器及(ji)(ji)管(guan)(guan)道(dao)用管(guan)(guan)、不銹耐酸(suan)管(guan)(guan)、化(hua)肥(fei)用高壓管(guan)(guan)以(yi)及(ji)(ji)輸送化(hua)工介質用管(guan)(guan)等。

6、其他各部門用(yong)(yong)(yong)管(guan)(guan)。如：容器(qi)(qi)用(yong)(yong)(yong)管(guan)(guan)（高壓氣瓶用(yong)(yong)(yong)管(guan)(guan)與一般(ban)容器(qi)(qi)管(guan)(guan)），儀表儀器(qi)(qi)用(yong)(yong)(yong)管(guan)(guan)、手表殼(ke)用(yong)(yong)(yong)管(guan)(guan)、注射針頭及(ji)其醫療器(qi)(qi)械用(yong)(yong)(yong)管(guan)(guan)等(deng)。

按鋼管材質分

鋼(gang)管(guan)(guan)(guan)按制管(guan)(guan)(guan)材質(zhi)（即鋼(gang)種）可分為(wei)：碳素(su)(su)(su)管(guan)(guan)(guan)和(he)合(he)金(jin)管(guan)(guan)(guan)、不銹(xiu)鋼(gang)管(guan)(guan)(guan)等。碳素(su)(su)(su)管(guan)(guan)(guan)又(you)可分為(wei)普通碳素(su)(su)(su)鋼(gang)管(guan)(guan)(guan)和(he)優質(zhi)碳素(su)(su)(su)結構管(guan)(guan)(guan)。合(he)金(jin)管(guan)(guan)(guan)又(you)可分為(wei)：低(di)合(he)金(jin)管(guan)(guan)(guan)、合(he)金(jin)結構管(guan)(guan)(guan)、高合(he)金(jin)管(guan)(guan)(guan)、高強度管(guan)(guan)(guan)。軸承管(guan)(guan)(guan)、耐(nai)(nai)熱耐(nai)(nai)酸不銹(xiu)管(guan)(guan)(guan)、精(jing)密(mi)合(he)金(jin)（如(ru)可伐合(he)金(jin)）管(guan)(guan)(guan)以及高溫合(he)金(jin)管(guan)(guan)(guan)等。