20號無縫鋼管在100℃與225℃溫(wen)度(temperature)的許應力的區別
20號(hao)鋼(gang)許用(yong)應力(li)：20號(hao)鋼(gang)在(zai)225℃下的(de)許用(yong)應力(li)：(16-36mm)111-124MPa之間(jian);(6-16mm)之間(jian)117-131MPa
20號(hao)鋼(gang)在100℃下的許(xu)用(yong)應力(li)(li)：150℃時,20號(hao)鋼(gang)鋼(gang)管的許(xu)用(yong)應力(li)(li)為130 MPa,20號(hao)鋼(gang)鍛件的許(xu)用(yong)應力(li)(li)為108MPa
無縫鋼管用途很廣泛(extensive)。一般用途的無縫鋼管由(you)普通的碳(C)素結(jie)構(gou)(Structure)鋼、低(di)合金結(jie)構(gou)鋼或合金結(jie)構(gou)鋼軋(ya)制(zhi)，產量最多(duo)，主要用作輸送流(liu)體的管(guan)道(dao)或結(jie)構(gou)零(ling)件。2、根據用途(tu)不同分(fen)三類(lei)供(gong)應(ying)：
A、按(an)化(hua)學(xue)(Chemistry)成分(ingredient)和機械(machinery)性能(neng)(xìng néng)供應;
B、按機械(xie)(machinery)性能(xìng néng)供應;
C、按(an)水壓(ya)試驗供(gong)應。GB9948無(wu)(wu)縫(feng)(feng)鋼(gang)(gang)管(guan)(guan)(guan)主要用(yong)來(lai)生(sheng)產氣(qi)(qi)動或液壓(ya) 元件的產品，如氣(qi)(qi)缸(gang)(gang)或油缸(gang)(gang)，都是用(yong)無(wu)(wu)縫(feng)(feng)管(guan)(guan)(guan)。精密(mi)無(wu)(wu)縫(feng)(feng)鋼(gang)(gang)管(guan)(guan)(guan)的化學(xue)成分有(you)碳C、硅Si、錳Mn、硫S、磷P、鉻Cr。GB5310無(wu)(wu)縫(feng)(feng)鋼(gang)(gang)管(guan)(guan)(guan)按(an)照用(yong)途分為結構(gou)用(yong)無(wu)(wu)縫(feng)(feng)鋼(gang)(gang)管(guan)(guan)(guan);輸(shu)送用(yong)無(wu)(wu)縫(feng)(feng)鋼(gang)(gang)管(guan)(guan)(guan);鍋爐(lu)用(yong)無(wu)(wu)縫(feng)(feng)鋼(gang)(gang)管(guan)(guan)(guan);鍋爐(lu)用(yong)高壓(ya)無(wu)(wu)縫(feng)(feng)鋼(gang)(gang)管(guan)(guan)(guan).無(wu)(wu)縫(feng)(feng)鋼(gang)(gang)管(guan)(guan)(guan)按(an)照斷面形(xing)狀，無(wu)(wu)縫(feng)(feng)鋼(gang)(gang)管(guan)(guan)(guan)分圓(yuan)形(xing)和異(yi)形(xing)兩種，異(yi)形(xing)管(guan)(guan)(guan)有(you)方(fang)形(xing)、橢圓(yuan)形(xing)、三角形(xing)、六角形(xing)、瓜(gua)子形(xing)、星(xing)形(xing)、 帶翅(chi)管(guan)(guan)(guan)多種復雜形(xing)狀。按(an)
A、b類供(gong)應的鋼(gang)(gang)(gang)(gang)(gang)管(guan)(guan)(guan)(guan)(guan)，如(ru)用(yong)于承受(shou)液體(ti)壓力(li)(pressure)，也要進行水(shui)壓(特(te)指:壓強)試(shi)驗。3、專門用(yong)途的無(wu)(wu)(wu)縫(feng)(feng)管(guan)(guan)(guan)(guan)(guan)有鍋爐(Boilers)用(yong)無(wu)(wu)(wu)縫(feng)(feng)管(guan)(guan)(guan)(guan)(guan)、化工(gong)電力(li)用(yong)，地質用(yong)無(wu)(wu)(wu)縫(feng)(feng)鋼(gang)(gang)(gang)(gang)(gang)管(guan)(guan)(guan)(guan)(guan)及(ji)石(shi)油(petroleum)用(yong)無(wu)(wu)(wu)縫(feng)(feng)管(guan)(guan)(guan)(guan)(guan)等多種。 無(wu)(wu)(wu)縫(feng)(feng)鋼(gang)(gang)(gang)(gang)(gang)管(guan)(guan)(guan)(guan)(guan)具(ju)有中空(kong)(zhōng kōng)截(jie)面(mian)(mian)，大(da)量用(yong)作輸(shu)送流體(ti)的管(guan)(guan)(guan)(guan)(guan)道(dao)(dao)(Conduit)，如(ru)輸(shu)送石(shi)油、天然(natural)氣、煤氣(Coal Gas)、水(shui)及(ji)某些固體(ti)物料的管(guan)(guan)(guan)(guan)(guan)道(dao)(dao)等。鋼(gang)(gang)(gang)(gang)(gang)管(guan)(guan)(guan)(guan)(guan)與圓鋼(gang)(gang)(gang)(gang)(gang)等實心鋼(gang)(gang)(gang)(gang)(gang)材(cai)相比，在抗彎抗扭強度(du)(strength)相同時，重量較輕，是一種經濟(ji)(Economy)截(jie)面(mian)(mian)鋼(gang)(gang)(gang)(gang)(gang)材(cai)。 廣泛(extensive)用(yong)于制造(zhì zào)結構(Structure)件和(he)機(ji)械(machinery)零件，如(ru)石(shi)油鉆桿、汽車(che)(auto)傳動軸(傳動軸組成:軸管(guan)(guan)(guan)(guan)(guan)、伸(shen)縮套和(he)萬(wan)向節)、自(zi)行車(che)架以及(ji)建筑(Architecture)施工(gong)中用(yong)的鋼(gang)(gang)(gang)(gang)(gang)腳手架等用(yong)鋼(gang)(gang)(gang)(gang)(gang)管(guan)(guan)(guan)(guan)(guan)制造環形零件，可提高(gao)材(cai)料(Material)利用(yong)率(availability)，簡化制造工(gong)序，節約材(cai)料和(he)加工(gong)(Processing)工(gong)時，已廣泛用(yong)鋼(gang)(gang)(gang)(gang)(gang)管(guan)(guan)(guan)(guan)(guan)來制造。
