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)用途(tu)不同分三類供應：

　　A、按化(hua)學成(cheng)分和機械(xie)性能供(gong)應;

　　B、按(an)機械)性能(neng)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有碳C、硅Si、錳Mn、硫S、磷P、鉻(ge)Cr。GB5310無(wu)(wu)(wu)縫(feng)鋼(gang)(gang)管(guan)(guan)按照用途分為結構用無(wu)(wu)(wu)縫(feng)鋼(gang)(gang)管(guan)(guan);輸(shu)送用無(wu)(wu)(wu)縫(feng)鋼(gang)(gang)管(guan)(guan);鍋(guo)爐(lu)用無(wu)(wu)(wu)縫(feng)鋼(gang)(gang)管(guan)(guan);鍋(guo)爐(lu)用高壓無(wu)(wu)(wu)縫(feng)鋼(gang)(gang)管(guan)(guan)、無(wu)(wu)(wu)縫(feng)鋼(gang)(gang)管(guan)(guan)按照斷面形(xing)(xing)(xing)狀，無(wu)(wu)(wu)縫(feng)鋼(gang)(gang)管(guan)(guan)分圓(yuan)形(xing)(xing)(xing)和異形(xing)(xing)(xing)兩種(zhong)(zhong)，異形(xing)(xing)(xing)管(guan)(guan)有方形(xing)(xing)(xing)、橢圓(yuan)形(xing)(xing)(xing)、三角形(xing)(xing)(xing)、六角形(xing)(xing)(xing)、瓜子形(xing)(xing)(xing)、星形(xing)(xing)(xing)、帶翅管(guan)(guan)多種(zhong)(zhong)復(fu)雜形(xing)(xing)(xing)狀。按b類供應的(de)(de)鋼(gang)(gang)管(guan)，如用(yong)(yong)于承受液(ye)體壓(ya)力，也(ye)要進行水壓(ya)(特指：壓(ya)強(qiang))試驗(yan)。3、專門用(yong)(yong)途(tu)的(de)(de)無縫管(guan)有鍋爐用(yong)(yong)無縫管(guan)、化工電力用(yong)(yong)，地質用(yong)(yong)無縫鋼(gang)(gang)管(guan)及石油用(yong)(yong)無縫管(guan)等(deng)多種。無縫鋼(gang)(gang)管(guan)具有中空截面(mian)，大(da)量(liang)用(yong)(yong)作(zuo)輸(shu)(shu)送(song)流體的(de)(de)管(guan)道，如輸(shu)(shu)送(song)石油、天然氣(qi)、煤(mei)氣(qi)、水及某些固體物料的(de)(de)管(guan)道等(deng)。鋼(gang)(gang)管(guan)與圓(yuan)鋼(gang)(gang)等(deng)實心鋼(gang)(gang)材(cai)相比，在抗彎抗扭(niu)強(qiang)度相同時，重量(liang)較輕，是(shi)一種經濟(ji)截面(mian)鋼(gang)(gang)材(cai)。

　　廣泛用(yong)(yong)于制造(zao)結構件(jian)(jian)(jian)和機(ji)械零件(jian)(jian)(jian)，如石油鉆桿、汽車(che)傳(chuan)動軸(zhou)(傳(chuan)動軸(zhou)組成：軸(zhou)管、伸縮(suo)套和萬向節)、自行車(che)架以及建筑)施工(gong)中用(yong)(yong)的鋼腳手架等用(yong)(yong)鋼管制造(zao)環形零件(jian)(jian)(jian)，可提高材(cai)料利用(yong)(yong)率，簡化制造(zao)工(gong)序，節約(yue)材(cai)料和加工(gong)工(gong)時，已廣泛用(yong)(yong)鋼管來制造(zao)。