20號無縫鋼管在(zai)100℃與225℃溫度(temperature)的(de)許應力的(de)區別
20號(hao)鋼許用(yong)應力：20號(hao)鋼在225℃下的許用(yong)應力：(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(yong)應(ying)力：150℃時,20號(hao)鋼(gang)鋼(gang)管的(de)許用(yong)應(ying)力為(wei)130 MPa,20號(hao)鋼(gang)鍛件(jian)的(de)許用(yong)應(ying)力為(wei)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(C)素結(jie)(jie)構(gou)(Structure)鋼、低合金(jin)(jin)結(jie)(jie)構(gou)鋼或合金(jin)(jin)結(jie)(jie)構(gou)鋼軋制，產量(liang)最多，主要用作輸送流體的(de)管道或結(jie)(jie)構(gou)零(ling)件。2、根(gen)據用途不同(tong)分(fen)三(san)類(lei)供應：
A、按化學(Chemistry)成分(ingredient)和(he)機械(machinery)性(xing)能(neng)(xìng néng)供應;
B、按機械(xie)(machinery)性能(xìng néng)供應;
C、按(an)水壓試驗供應。GB9948無(wu)縫鋼(gang)管(guan)(guan)主要用來生產氣(qi)動或液壓 元件(jian)的產品，如氣(qi)缸或油缸，都是用無(wu)縫管(guan)(guan)。精密無(wu)縫鋼(gang)管(guan)(guan)的化(hua)學成(cheng)分(fen)有碳C、硅(gui)Si、錳Mn、硫S、磷P、鉻Cr。GB5310無(wu)縫鋼(gang)管(guan)(guan)按(an)照用途分(fen)為結構用無(wu)縫鋼(gang)管(guan)(guan);輸(shu)送用無(wu)縫鋼(gang)管(guan)(guan);鍋爐(lu)用無(wu)縫鋼(gang)管(guan)(guan);鍋爐(lu)用高壓無(wu)縫鋼(gang)管(guan)(guan).無(wu)縫鋼(gang)管(guan)(guan)按(an)照斷(duan)面形(xing)(xing)(xing)(xing)(xing)狀(zhuang)，無(wu)縫鋼(gang)管(guan)(guan)分(fen)圓形(xing)(xing)(xing)(xing)(xing)和(he)異形(xing)(xing)(xing)(xing)(xing)兩種，異形(xing)(xing)(xing)(xing)(xing)管(guan)(guan)有方(fang)形(xing)(xing)(xing)(xing)(xing)、橢圓形(xing)(xing)(xing)(xing)(xing)、三(san)角(jiao)形(xing)(xing)(xing)(xing)(xing)、六角(jiao)形(xing)(xing)(xing)(xing)(xing)、瓜子(zi)形(xing)(xing)(xing)(xing)(xing)、星(xing)形(xing)(xing)(xing)(xing)(xing)、 帶翅(chi)管(guan)(guan)多種復雜形(xing)(xing)(xing)(xing)(xing)狀(zhuang)。按(an)
A、b類供應的(de)(de)鋼(gang)管(guan)(guan)(guan)(guan)，如(ru)(ru)用(yong)(yong)于(yu)承受液體壓力(pressure)，也要進行(xing)水(shui)壓(特指(zhi):壓強)試驗。3、專門用(yong)(yong)途的(de)(de)無(wu)縫(feng)管(guan)(guan)(guan)(guan)有鍋(guo)爐(Boilers)用(yong)(yong)無(wu)縫(feng)管(guan)(guan)(guan)(guan)、化工(gong)電力用(yong)(yong)，地(di)質用(yong)(yong)無(wu)縫(feng)鋼(gang)管(guan)(guan)(guan)(guan)及(ji)石(shi)(shi)油(you)(petroleum)用(yong)(yong)無(wu)縫(feng)管(guan)(guan)(guan)(guan)等(deng)多種。 無(wu)縫(feng)鋼(gang)管(guan)(guan)(guan)(guan)具(ju)有中空(kong)(zhōng kōng)截(jie)面(mian)，大量用(yong)(yong)作輸送(song)流體的(de)(de)管(guan)(guan)(guan)(guan)道(Conduit)，如(ru)(ru)輸送(song)石(shi)(shi)油(you)、天然(natural)氣、煤氣(Coal Gas)、水(shui)及(ji)某些固體物料(liao)的(de)(de)管(guan)(guan)(guan)(guan)道等(deng)。鋼(gang)管(guan)(guan)(guan)(guan)與圓鋼(gang)等(deng)實心(xin)鋼(gang)材相比，在抗(kang)彎抗(kang)扭強度(strength)相同時，重量較輕，是一種經濟(ji)(Economy)截(jie)面(mian)鋼(gang)材。 廣(guang)泛(extensive)用(yong)(yong)于(yu)制(zhi)造(zao)(zao)(zhì zào)結構(Structure)件和(he)機械(machinery)零(ling)(ling)件，如(ru)(ru)石(shi)(shi)油(you)鉆(zhan)桿(gan)、汽車(auto)傳動(dong)軸(傳動(dong)軸組成:軸管(guan)(guan)(guan)(guan)、伸縮套和(he)萬向節)、自行(xing)車架(jia)以(yi)及(ji)建筑(zhu)(Architecture)施(shi)工(gong)中用(yong)(yong)的(de)(de)鋼(gang)腳手架(jia)等(deng)用(yong)(yong)鋼(gang)管(guan)(guan)(guan)(guan)制(zhi)造(zao)(zao)環形零(ling)(ling)件，可提高材料(liao)(Material)利用(yong)(yong)率(availability)，簡化制(zhi)造(zao)(zao)工(gong)序，節約材料(liao)和(he)加工(gong)(Processing)工(gong)時，已廣(guang)泛用(yong)(yong)鋼(gang)管(guan)(guan)(guan)(guan)來制(zhi)造(zao)(zao)。
