20號無縫鋼管在100℃與(yu)225℃溫度(temperature)的(de)許應力(li)的(de)區別
20號鋼(gang)許(xu)用(yong)應(ying)力(li)：20號鋼(gang)在225℃下的(de)許(xu)用(yong)應(ying)力(li)：(16-36mm)111-124MPa之間(jian);(6-16mm)之間(jian)117-131MPa
20號鋼(gang)在100℃下的許(xu)用(yong)應力：150℃時,20號鋼(gang)鋼(gang)管的許(xu)用(yong)應力為130 MPa,20號鋼(gang)鍛件的許(xu)用(yong)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(de)碳(tan)(C)素結構(gou)(gou)(Structure)鋼(gang)、低(di)合(he)金結構(gou)(gou)鋼(gang)或(huo)合(he)金結構(gou)(gou)鋼(gang)軋制(zhi)，產(chan)量最多(duo)，主要用作輸送(song)流體(ti)的(de)管道或(huo)結構(gou)(gou)零件。2、根據用途不同分三(san)類供應：
A、按化(hua)學(Chemistry)成分(ingredient)和機械(xie)(machinery)性能(xìng néng)供應(ying);
B、按機械(machinery)性能(neng)(xìng néng)供應;
C、按(an)水壓(ya)試驗(yan)供應。GB9948無(wu)(wu)(wu)縫(feng)(feng)鋼(gang)(gang)管(guan)(guan)(guan)主要用(yong)來生(sheng)產(chan)(chan)氣(qi)動或(huo)液(ye)壓(ya) 元(yuan)件的(de)產(chan)(chan)品，如氣(qi)缸或(huo)油缸，都是用(yong)無(wu)(wu)(wu)縫(feng)(feng)管(guan)(guan)(guan)。精密無(wu)(wu)(wu)縫(feng)(feng)鋼(gang)(gang)管(guan)(guan)(guan)的(de)化學成分有碳(tan)C、硅Si、錳(meng)Mn、硫S、磷P、鉻Cr。GB5310無(wu)(wu)(wu)縫(feng)(feng)鋼(gang)(gang)管(guan)(guan)(guan)按(an)照用(yong)途分為結構用(yong)無(wu)(wu)(wu)縫(feng)(feng)鋼(gang)(gang)管(guan)(guan)(guan);輸送(song)用(yong)無(wu)(wu)(wu)縫(feng)(feng)鋼(gang)(gang)管(guan)(guan)(guan);鍋爐用(yong)無(wu)(wu)(wu)縫(feng)(feng)鋼(gang)(gang)管(guan)(guan)(guan);鍋爐用(yong)高壓(ya)無(wu)(wu)(wu)縫(feng)(feng)鋼(gang)(gang)管(guan)(guan)(guan).無(wu)(wu)(wu)縫(feng)(feng)鋼(gang)(gang)管(guan)(guan)(guan)按(an)照斷面形(xing)(xing)(xing)狀(zhuang)(zhuang)，無(wu)(wu)(wu)縫(feng)(feng)鋼(gang)(gang)管(guan)(guan)(guan)分圓形(xing)(xing)(xing)和異形(xing)(xing)(xing)兩種，異形(xing)(xing)(xing)管(guan)(guan)(guan)有方形(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(xing)形(xing)(xing)(xing)、 帶翅管(guan)(guan)(guan)多(duo)種復雜形(xing)(xing)(xing)狀(zhuang)(zhuang)。按(an)
A、b類供(gong)應(ying)的(de)鋼(gang)(gang)管(guan)(guan)(guan)(guan)，如(ru)用(yong)(yong)于承受(shou)液體(ti)(ti)(ti)壓(ya)力(li)(pressure)，也(ye)要(yao)進行水壓(ya)(特指:壓(ya)強)試驗。3、專(zhuan)門用(yong)(yong)途的(de)無縫管(guan)(guan)(guan)(guan)有鍋爐(Boilers)用(yong)(yong)無縫管(guan)(guan)(guan)(guan)、化工電力(li)用(yong)(yong)，地質用(yong)(yong)無縫鋼(gang)(gang)管(guan)(guan)(guan)(guan)及石(shi)油(petroleum)用(yong)(yong)無縫管(guan)(guan)(guan)(guan)等(deng)(deng)多種。 無縫鋼(gang)(gang)管(guan)(guan)(guan)(guan)具有中空(zhōng kōng)截面，大(da)量用(yong)(yong)作輸送流體(ti)(ti)(ti)的(de)管(guan)(guan)(guan)(guan)道(Conduit)，如(ru)輸送石(shi)油、天然(natural)氣、煤氣(Coal Gas)、水及某些固(gu)體(ti)(ti)(ti)物料(liao)的(de)管(guan)(guan)(guan)(guan)道等(deng)(deng)。鋼(gang)(gang)管(guan)(guan)(guan)(guan)與圓(yuan)鋼(gang)(gang)等(deng)(deng)實心鋼(gang)(gang)材相(xiang)比(bi)，在抗彎抗扭強度(strength)相(xiang)同(tong)時(shi)，重量較輕，是一種經濟(ji)(Economy)截面鋼(gang)(gang)材。 廣(guang)泛(extensive)用(yong)(yong)于制(zhi)造(zao)(zao)(zao)(zhì zào)結構(Structure)件和(he)機械(xie)(machinery)零件，如(ru)石(shi)油鉆桿、汽車(che)(auto)傳動軸(傳動軸組成(cheng):軸管(guan)(guan)(guan)(guan)、伸(shen)縮套(tao)和(he)萬向節(jie)(jie))、自行車(che)架(jia)以及建筑(Architecture)施(shi)工中用(yong)(yong)的(de)鋼(gang)(gang)腳手架(jia)等(deng)(deng)用(yong)(yong)鋼(gang)(gang)管(guan)(guan)(guan)(guan)制(zhi)造(zao)(zao)(zao)環形零件，可(ke)提高材料(liao)(Material)利用(yong)(yong)率(lv)(availability)，簡化制(zhi)造(zao)(zao)(zao)工序(xu)，節(jie)(jie)約材料(liao)和(he)加工(Processing)工時(shi)，已廣(guang)泛用(yong)(yong)鋼(gang)(gang)管(guan)(guan)(guan)(guan)來制(zhi)造(zao)(zao)(zao)。
