45#無縫鋼管的現貨資源目前規格齊全，無縫鋼管用途很廣泛，一般用途的無縫鋼管由普通的碳素結構鋼、低合金結構鋼或合金結構鋼軋制，產量多，主要用作輸送流體的管道或結構零件。根據(ju)用(yong)途不同分三類供應：

　　A、按化學成(cheng)分和機械性能供應;

　　B、按(an)機械)性能供應;

　　C、按水壓試驗供應。GB9948無縫鋼管主要用來生產氣動或液壓元件的產品，如氣缸或油缸，都是用無縫管。45#無縫鋼管的化學成分(fen)有碳C、硅Si、錳Mn、硫(liu)S、磷P、鉻Cr。GB5310無(wu)(wu)縫(feng)鋼(gang)(gang)管(guan)(guan)(guan)按(an)照用(yong)(yong)途分(fen)為(wei)結構用(yong)(yong)無(wu)(wu)縫(feng)鋼(gang)(gang)管(guan)(guan)(guan);輸送用(yong)(yong)無(wu)(wu)縫(feng)鋼(gang)(gang)管(guan)(guan)(guan);鍋爐用(yong)(yong)無(wu)(wu)縫(feng)鋼(gang)(gang)管(guan)(guan)(guan);鍋爐用(yong)(yong)高(gao)壓無(wu)(wu)縫(feng)鋼(gang)(gang)管(guan)(guan)(guan)、無(wu)(wu)縫(feng)鋼(gang)(gang)管(guan)(guan)(guan)按(an)照斷面(mian)形(xing)(xing)(xing)(xing)(xing)狀，無(wu)(wu)縫(feng)鋼(gang)(gang)管(guan)(guan)(guan)分(fen)圓形(xing)(xing)(xing)(xing)(xing)和(he)異形(xing)(xing)(xing)(xing)(xing)兩種，異形(xing)(xing)(xing)(xing)(xing)管(guan)(guan)(guan)有方形(xing)(xing)(xing)(xing)(xing)、橢圓形(xing)(xing)(xing)(xing)(xing)、三(san)角(jiao)形(xing)(xing)(xing)(xing)(xing)、六角(jiao)形(xing)(xing)(xing)(xing)(xing)、瓜子形(xing)(xing)(xing)(xing)(xing)、星形(xing)(xing)(xing)(xing)(xing)、帶翅管(guan)(guan)(guan)多種復(fu)雜(za)形(xing)(xing)(xing)(xing)(xing)狀。按(an)b類供應(ying)的(de)鋼(gang)管(guan)，如用(yong)(yong)(yong)于承受液(ye)體壓(ya)力(li)，也要(yao)進行水(shui)壓(ya)(特指：壓(ya)強)試(shi)驗。3、專門用(yong)(yong)(yong)途的(de)無(wu)縫(feng)管(guan)有鍋爐用(yong)(yong)(yong)無(wu)縫(feng)管(guan)、化工電力(li)用(yong)(yong)(yong)，地質用(yong)(yong)(yong)無(wu)縫(feng)鋼(gang)管(guan)及石油用(yong)(yong)(yong)無(wu)縫(feng)管(guan)等(deng)多(duo)種(zhong)。無(wu)縫(feng)鋼(gang)管(guan)具有中空(kong)截面，大量(liang)用(yong)(yong)(yong)作輸送(song)流(liu)體的(de)管(guan)道，如輸送(song)石油、天然(ran)氣、煤氣、水(shui)及某些(xie)固體物料的(de)管(guan)道等(deng)。鋼(gang)管(guan)與(yu)圓鋼(gang)等(deng)實心鋼(gang)材(cai)相(xiang)比(bi)，在抗彎(wan)抗扭(niu)強度相(xiang)同(tong)時，重量(liang)較輕，是(shi)一(yi)種(zhong)經濟截面鋼(gang)材(cai)。

　　廣泛用(yong)于制(zhi)造(zao)(zao)結構件和機械零件，如石油鉆桿、汽車傳動(dong)(dong)軸(傳動(dong)(dong)軸組(zu)成：軸管、伸縮套和萬向節)、自(zi)行(xing)車架以(yi)及建筑)施工中用(yong)的鋼(gang)腳手架等用(yong)鋼(gang)管制(zhi)造(zao)(zao)環(huan)形零件，可提高材料利用(yong)率，簡化(hua)制(zhi)造(zao)(zao)工序，節約材料和加(jia)工工時(shi)，已(yi)廣泛用(yong)鋼(gang)管來制(zhi)造(zao)(zao)。