20號無縫鋼管在100℃與(yu)225℃溫度(temperature)的許應力的區別

　　20號鋼(gang)許(xu)用應力：20號鋼(gang)在225℃下的許(xu)用應力：(16-36mm)111-124MPa之間;(6-16mm)之間117-131MPa

　　20號(hao)鋼(gang)(gang)(gang)在100℃下的許用(yong)(yong)(yong)應(ying)(ying)力(li)：150℃時(shi),20號(hao)鋼(gang)(gang)(gang)鋼(gang)(gang)(gang)管的許用(yong)(yong)(yong)應(ying)(ying)力(li)為130 MPa,20號(hao)鋼(gang)(gang)(gang)鍛件的許用(yong)(yong)(yong)應(ying)(ying)力(li)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)素結構(Structure)鋼、低合金結構鋼或合金結構鋼軋制，產(chan)量最(zui)多，主要(yao)用(yong)作輸送流(liu)體的管道或結構零件。2、根據用(yong)途不同分三類供應：

　　A、按化(hua)學(Chemistry)成分(ingredient)和機械(xie)(machinery)性能(xìng néng)供應;

　　B、按機械(machinery)性能(xìng néng)供應(ying);

　　C、按(an)水壓試驗供應。GB9948無(wu)縫鋼管主要用(yong)(yong)(yong)來生產氣動或(huo)液壓 元件的(de)產品，如(ru)氣缸或(huo)油缸，都是用(yong)(yong)(yong)無(wu)縫管。精密(mi)無(wu)縫鋼管的(de)化學成分(fen)有(you)(you)碳C、硅(gui)Si、錳Mn、硫S、磷(lin)P、鉻Cr。GB5310無(wu)縫鋼管按(an)照(zhao)用(yong)(yong)(yong)途分(fen)為結構用(yong)(yong)(yong)無(wu)縫鋼管;輸送用(yong)(yong)(yong)無(wu)縫鋼管;鍋爐(lu)用(yong)(yong)(yong)無(wu)縫鋼管;鍋爐(lu)用(yong)(yong)(yong)高壓無(wu)縫鋼管.無(wu)縫鋼管按(an)照(zhao)斷(duan)面(mian)形(xing)(xing)(xing)狀(zhuang)，無(wu)縫鋼管分(fen)圓形(xing)(xing)(xing)和異(yi)形(xing)(xing)(xing)兩種，異(yi)形(xing)(xing)(xing)管有(you)(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(zi)形(xing)(xing)(xing)、星形(xing)(xing)(xing)、 帶翅管多(duo)種復雜形(xing)(xing)(xing)狀(zhuang)。按(an)

　　A、b類供應的鋼(gang)(gang)管(guan)(guan)，如(ru)用(yong)(yong)于承(cheng)受液體壓(ya)力(pressure)，也(ye)要進行(xing)水壓(ya)(特指(zhi):壓(ya)強)試驗。3、專門用(yong)(yong)途的無縫(feng)(feng)(feng)管(guan)(guan)有鍋(guo)爐(Boilers)用(yong)(yong)無縫(feng)(feng)(feng)管(guan)(guan)、化(hua)工(gong)電力用(yong)(yong)，地質用(yong)(yong)無縫(feng)(feng)(feng)鋼(gang)(gang)管(guan)(guan)及(ji)石(shi)(shi)(shi)油(petroleum)用(yong)(yong)無縫(feng)(feng)(feng)管(guan)(guan)等多種。 無縫(feng)(feng)(feng)鋼(gang)(gang)管(guan)(guan)具有中空(zhōng kōng)截面，大量用(yong)(yong)作輸送(song)流體的管(guan)(guan)道(Conduit)，如(ru)輸送(song)石(shi)(shi)(shi)油、天然(natural)氣、煤氣(Coal Gas)、水及(ji)某些(xie)固體物料的管(guan)(guan)道等。鋼(gang)(gang)管(guan)(guan)與圓鋼(gang)(gang)等實心鋼(gang)(gang)材相比，在(zai)抗彎抗扭強度(strength)相同時(shi)(shi)，重量較輕(qing)，是一種經濟(Economy)截面鋼(gang)(gang)材。 廣(guang)泛(fan)(extensive)用(yong)(yong)于制(zhi)造(zao)(zhì zào)結構(Structure)件(jian)和機械(xie)(machinery)零(ling)件(jian)，如(ru)石(shi)(shi)(shi)油鉆桿、汽(qi)車(che)(auto)傳(chuan)動軸(傳(chuan)動軸組(zu)成:軸管(guan)(guan)、伸縮(suo)套(tao)和萬向節)、自行(xing)車(che)架以(yi)及(ji)建(jian)筑(Architecture)施工(gong)中用(yong)(yong)的鋼(gang)(gang)腳手架等用(yong)(yong)鋼(gang)(gang)管(guan)(guan)制(zhi)造(zao)環形(xing)零(ling)件(jian)，可提(ti)高材料(Material)利用(yong)(yong)率(availability)，簡化(hua)制(zhi)造(zao)工(gong)序，節約(yue)材料和加(jia)工(gong)(Processing)工(gong)時(shi)(shi)，已廣(guang)泛(fan)用(yong)(yong)鋼(gang)(gang)管(guan)(guan)來制(zhi)造(zao)。