20號無縫鋼管在(zai)100℃與(yu)225℃溫度(temperature)的許應力的區別(bie)
20號鋼許(xu)用(yong)應(ying)力：20號鋼在225℃下的許(xu)用(yong)應(ying)力：(16-36mm)111-124MPa之(zhi)(zhi)間;(6-16mm)之(zhi)(zhi)間117-131MPa
20號鋼(gang)在100℃下(xia)的許用應(ying)(ying)力(li)：150℃時,20號鋼(gang)鋼(gang)管的許用應(ying)(ying)力(li)為130 MPa,20號鋼(gang)鍛件(jian)的許用應(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(de)碳(tan)(C)素結(jie)構(Structure)鋼(gang)、低合金(jin)結(jie)構鋼(gang)或合金(jin)結(jie)構鋼(gang)軋(ya)制(zhi)，產量(liang)最多，主要用(yong)(yong)作輸(shu)送流體的(de)管(guan)道或結(jie)構零件。2、根(gen)據用(yong)(yong)途不同分三類供(gong)應(ying)：
A、按(an)化學(Chemistry)成分(ingredient)和機械(machinery)性能(xìng néng)供應;
B、按機械(machinery)性能(xìng néng)供應;
C、按水(shui)壓試驗(yan)供應。GB9948無(wu)縫(feng)鋼(gang)管(guan)(guan)(guan)主(zhu)要用(yong)來生產氣動或(huo)液壓 元件的(de)產品，如氣缸或(huo)油缸，都(dou)是用(yong)無(wu)縫(feng)管(guan)(guan)(guan)。精密無(wu)縫(feng)鋼(gang)管(guan)(guan)(guan)的(de)化(hua)學成分有(you)碳C、硅Si、錳Mn、硫S、磷P、鉻Cr。GB5310無(wu)縫(feng)鋼(gang)管(guan)(guan)(guan)按照用(yong)途分為結(jie)構用(yong)無(wu)縫(feng)鋼(gang)管(guan)(guan)(guan);輸送用(yong)無(wu)縫(feng)鋼(gang)管(guan)(guan)(guan);鍋爐用(yong)無(wu)縫(feng)鋼(gang)管(guan)(guan)(guan);鍋爐用(yong)高壓無(wu)縫(feng)鋼(gang)管(guan)(guan)(guan).無(wu)縫(feng)鋼(gang)管(guan)(guan)(guan)按照斷面形(xing)(xing)狀(zhuang)(zhuang)，無(wu)縫(feng)鋼(gang)管(guan)(guan)(guan)分圓(yuan)形(xing)(xing)和異形(xing)(xing)兩(liang)種，異形(xing)(xing)管(guan)(guan)(guan)有(you)方形(xing)(xing)、橢圓(yuan)形(xing)(xing)、三角形(xing)(xing)、六角形(xing)(xing)、瓜子形(xing)(xing)、星形(xing)(xing)、 帶(dai)翅管(guan)(guan)(guan)多種復雜形(xing)(xing)狀(zhuang)(zhuang)。按
A、b類(lei)供應的鋼(gang)(gang)管(guan)(guan)(guan)(guan)，如(ru)用(yong)(yong)(yong)(yong)于承受液體(ti)壓力(pressure)，也要(yao)進(jin)行(xing)水壓(特指:壓強)試驗。3、專門用(yong)(yong)(yong)(yong)途的無(wu)縫(feng)(feng)管(guan)(guan)(guan)(guan)有(you)鍋(guo)爐(lu)(Boilers)用(yong)(yong)(yong)(yong)無(wu)縫(feng)(feng)管(guan)(guan)(guan)(guan)、化工(gong)電力用(yong)(yong)(yong)(yong)，地質用(yong)(yong)(yong)(yong)無(wu)縫(feng)(feng)鋼(gang)(gang)管(guan)(guan)(guan)(guan)及石(shi)油(you)(petroleum)用(yong)(yong)(yong)(yong)無(wu)縫(feng)(feng)管(guan)(guan)(guan)(guan)等(deng)多(duo)種(zhong)。 無(wu)縫(feng)(feng)鋼(gang)(gang)管(guan)(guan)(guan)(guan)具有(you)中空(zhōng kōng)截面(mian)，大量用(yong)(yong)(yong)(yong)作輸(shu)送(song)流體(ti)的管(guan)(guan)(guan)(guan)道(Conduit)，如(ru)輸(shu)送(song)石(shi)油(you)、天(tian)然(natural)氣、煤氣(Coal Gas)、水及某(mou)些固體(ti)物料的管(guan)(guan)(guan)(guan)道等(deng)。鋼(gang)(gang)管(guan)(guan)(guan)(guan)與圓(yuan)鋼(gang)(gang)等(deng)實心(xin)鋼(gang)(gang)材(cai)相比，在抗(kang)彎抗(kang)扭(niu)強度(strength)相同時(shi)，重量較輕(qing)，是一種(zhong)經(jing)濟(Economy)截面(mian)鋼(gang)(gang)材(cai)。 廣泛(extensive)用(yong)(yong)(yong)(yong)于制造(zao)(zhì zào)結構(gou)(Structure)件和機械(machinery)零(ling)件，如(ru)石(shi)油(you)鉆桿、汽車(auto)傳動軸(zhou)(傳動軸(zhou)組成:軸(zhou)管(guan)(guan)(guan)(guan)、伸(shen)縮套和萬向節)、自行(xing)車架以及建筑(Architecture)施工(gong)中用(yong)(yong)(yong)(yong)的鋼(gang)(gang)腳(jiao)手(shou)架等(deng)用(yong)(yong)(yong)(yong)鋼(gang)(gang)管(guan)(guan)(guan)(guan)制造(zao)環形零(ling)件，可提(ti)高材(cai)料(Material)利用(yong)(yong)(yong)(yong)率(availability)，簡化制造(zao)工(gong)序，節約材(cai)料和加(jia)工(gong)(Processing)工(gong)時(shi)，已廣泛用(yong)(yong)(yong)(yong)鋼(gang)(gang)管(guan)(guan)(guan)(guan)來制造(zao)。
