20號無縫鋼管在100℃與225℃溫度(temperature)的許應力的區(qu)別
20號鋼(gang)許用應力(li)：20號鋼(gang)在(zai)225℃下(xia)的許用應力(li)：(16-36mm)111-124MPa之間(jian);(6-16mm)之間(jian)117-131MPa
20號(hao)鋼(gang)在100℃下的(de)許用應力：150℃時,20號(hao)鋼(gang)鋼(gang)管的(de)許用應力為130 MPa,20號(hao)鋼(gang)鍛件的(de)許用應力為108MPa
無縫鋼管用途很廣泛(extensive)。一般用途的無縫鋼管由普通的碳(tan)(C)素結(jie)構(gou)(gou)(Structure)鋼(gang)(gang)、低合金結(jie)構(gou)(gou)鋼(gang)(gang)或(huo)合金結(jie)構(gou)(gou)鋼(gang)(gang)軋(ya)制，產量最多，主要用作輸送流體的管道或(huo)結(jie)構(gou)(gou)零件。2、根(gen)據用途不同分三(san)類(lei)供應：
A、按化學(Chemistry)成(cheng)分(ingredient)和機(ji)械(machinery)性能(xìng néng)供應;
B、按(an)機(ji)械(machinery)性能(xìng néng)供應(ying);
C、按(an)水壓試驗供應。GB9948無(wu)縫(feng)(feng)(feng)鋼(gang)(gang)管(guan)(guan)(guan)(guan)主要用(yong)(yong)來生(sheng)產氣動(dong)或(huo)液壓 元件的產品，如氣缸或(huo)油缸，都(dou)是用(yong)(yong)無(wu)縫(feng)(feng)(feng)管(guan)(guan)(guan)(guan)。精密無(wu)縫(feng)(feng)(feng)鋼(gang)(gang)管(guan)(guan)(guan)(guan)的化學成分(fen)(fen)有(you)碳(tan)C、硅Si、錳Mn、硫S、磷P、鉻(ge)Cr。GB5310無(wu)縫(feng)(feng)(feng)鋼(gang)(gang)管(guan)(guan)(guan)(guan)按(an)照(zhao)用(yong)(yong)途分(fen)(fen)為結構用(yong)(yong)無(wu)縫(feng)(feng)(feng)鋼(gang)(gang)管(guan)(guan)(guan)(guan);輸送用(yong)(yong)無(wu)縫(feng)(feng)(feng)鋼(gang)(gang)管(guan)(guan)(guan)(guan);鍋(guo)爐用(yong)(yong)無(wu)縫(feng)(feng)(feng)鋼(gang)(gang)管(guan)(guan)(guan)(guan);鍋(guo)爐用(yong)(yong)高壓無(wu)縫(feng)(feng)(feng)鋼(gang)(gang)管(guan)(guan)(guan)(guan).無(wu)縫(feng)(feng)(feng)鋼(gang)(gang)管(guan)(guan)(guan)(guan)按(an)照(zhao)斷面(mian)形(xing)(xing)(xing)狀，無(wu)縫(feng)(feng)(feng)鋼(gang)(gang)管(guan)(guan)(guan)(guan)分(fen)(fen)圓形(xing)(xing)(xing)和異形(xing)(xing)(xing)兩種(zhong)，異形(xing)(xing)(xing)管(guan)(guan)(guan)(guan)有(you)方形(xing)(xing)(xing)、橢圓形(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(dai)翅(chi)管(guan)(guan)(guan)(guan)多種(zhong)復雜形(xing)(xing)(xing)狀。按(an)
A、b類(lei)供應的鋼(gang)(gang)(gang)(gang)管(guan)(guan)(guan)，如(ru)用(yong)(yong)于(yu)(yu)承受(shou)液體壓力(pressure)，也要進行水壓(特指:壓強)試驗。3、專門(men)用(yong)(yong)途的無(wu)縫(feng)(feng)(feng)管(guan)(guan)(guan)有(you)鍋爐(Boilers)用(yong)(yong)無(wu)縫(feng)(feng)(feng)管(guan)(guan)(guan)、化(hua)工(gong)(gong)(gong)電力用(yong)(yong)，地質用(yong)(yong)無(wu)縫(feng)(feng)(feng)鋼(gang)(gang)(gang)(gang)管(guan)(guan)(guan)及石油(you)(petroleum)用(yong)(yong)無(wu)縫(feng)(feng)(feng)管(guan)(guan)(guan)等(deng)多種。 無(wu)縫(feng)(feng)(feng)鋼(gang)(gang)(gang)(gang)管(guan)(guan)(guan)具(ju)有(you)中空(zhōng kōng)截面(mian)，大(da)量用(yong)(yong)作輸(shu)送(song)(song)流體的管(guan)(guan)(guan)道(Conduit)，如(ru)輸(shu)送(song)(song)石油(you)、天然(natural)氣(qi)、煤氣(qi)(Coal Gas)、水及某些(xie)固體物料(liao)的管(guan)(guan)(guan)道等(deng)。鋼(gang)(gang)(gang)(gang)管(guan)(guan)(guan)與圓鋼(gang)(gang)(gang)(gang)等(deng)實心鋼(gang)(gang)(gang)(gang)材(cai)相(xiang)比，在抗彎抗扭強度(strength)相(xiang)同時，重量較輕，是一種經濟(Economy)截面(mian)鋼(gang)(gang)(gang)(gang)材(cai)。 廣(guang)泛(extensive)用(yong)(yong)于(yu)(yu)制(zhi)造(zao)(zao)(zhì zào)結構(Structure)件和(he)機械(xie)(machinery)零件，如(ru)石油(you)鉆桿、汽車(che)(auto)傳動軸(傳動軸組(zu)成:軸管(guan)(guan)(guan)、伸縮套和(he)萬(wan)向(xiang)節)、自行車(che)架(jia)以及建筑(zhu)(Architecture)施工(gong)(gong)(gong)中用(yong)(yong)的鋼(gang)(gang)(gang)(gang)腳手(shou)架(jia)等(deng)用(yong)(yong)鋼(gang)(gang)(gang)(gang)管(guan)(guan)(guan)制(zhi)造(zao)(zao)環(huan)形(xing)零件，可提高材(cai)料(liao)(Material)利用(yong)(yong)率(availability)，簡化(hua)制(zhi)造(zao)(zao)工(gong)(gong)(gong)序，節約材(cai)料(liao)和(he)加工(gong)(gong)(gong)(Processing)工(gong)(gong)(gong)時，已廣(guang)泛用(yong)(yong)鋼(gang)(gang)(gang)(gang)管(guan)(guan)(guan)來制(zhi)造(zao)(zao)。
