20號無縫鋼管在100℃與(yu)225℃溫度(temperature)的許應力的區別
20號鋼許用應力(li)：20號鋼在225℃下的許用應力(li)：(16-36mm)111-124MPa之間(jian);(6-16mm)之間(jian)117-131MPa
20號(hao)鋼(gang)(gang)在(zai)100℃下的許(xu)用應(ying)力：150℃時,20號(hao)鋼(gang)(gang)鋼(gang)(gang)管的許(xu)用應(ying)力為(wei)130 MPa,20號(hao)鋼(gang)(gang)鍛件的許(xu)用應(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(pu)通的碳(tan)(C)素結(jie)(jie)構(gou)(Structure)鋼(gang)、低合金(jin)結(jie)(jie)構(gou)鋼(gang)或合金(jin)結(jie)(jie)構(gou)鋼(gang)軋(ya)制，產量(liang)最多，主要用作輸送流體的管道或結(jie)(jie)構(gou)零件。2、根據用途(tu)不同(tong)分(fen)三類供應：
A、按化學(Chemistry)成分(ingredient)和機械(machinery)性能(xìng néng)供應(ying);
B、按機械(xie)(machinery)性能(neng)(xìng néng)供應;
C、按水壓試(shi)驗供(gong)應(ying)。GB9948無(wu)縫(feng)(feng)鋼(gang)(gang)(gang)管(guan)主(zhu)要(yao)用(yong)(yong)來生產(chan)氣動(dong)或液壓 元件的(de)產(chan)品，如氣缸或油(you)缸，都是用(yong)(yong)無(wu)縫(feng)(feng)管(guan)。精密(mi)無(wu)縫(feng)(feng)鋼(gang)(gang)(gang)管(guan)的(de)化學成(cheng)分有碳C、硅Si、錳(meng)Mn、硫(liu)S、磷P、鉻Cr。GB5310無(wu)縫(feng)(feng)鋼(gang)(gang)(gang)管(guan)按照用(yong)(yong)途分為結構用(yong)(yong)無(wu)縫(feng)(feng)鋼(gang)(gang)(gang)管(guan);輸送用(yong)(yong)無(wu)縫(feng)(feng)鋼(gang)(gang)(gang)管(guan);鍋(guo)爐(lu)用(yong)(yong)無(wu)縫(feng)(feng)鋼(gang)(gang)(gang)管(guan);鍋(guo)爐(lu)用(yong)(yong)高壓無(wu)縫(feng)(feng)鋼(gang)(gang)(gang)管(guan).無(wu)縫(feng)(feng)鋼(gang)(gang)(gang)管(guan)按照斷面形狀，無(wu)縫(feng)(feng)鋼(gang)(gang)(gang)管(guan)分圓(yuan)形和異(yi)形兩種，異(yi)形管(guan)有方(fang)形、橢圓(yuan)形、三角形、六角形、瓜(gua)子(zi)形、星形、 帶翅(chi)管(guan)多(duo)種復雜形狀。按
A、b類(lei)供應的(de)鋼(gang)(gang)(gang)管(guan)(guan)(guan)(guan)(guan)，如用(yong)(yong)(yong)于承受液體(ti)壓(ya)力(pressure)，也要進(jin)行水壓(ya)(特指:壓(ya)強)試驗。3、專門用(yong)(yong)(yong)途的(de)無(wu)縫(feng)管(guan)(guan)(guan)(guan)(guan)有鍋(guo)爐(Boilers)用(yong)(yong)(yong)無(wu)縫(feng)管(guan)(guan)(guan)(guan)(guan)、化(hua)工(gong)電力用(yong)(yong)(yong)，地質用(yong)(yong)(yong)無(wu)縫(feng)鋼(gang)(gang)(gang)管(guan)(guan)(guan)(guan)(guan)及石油(petroleum)用(yong)(yong)(yong)無(wu)縫(feng)管(guan)(guan)(guan)(guan)(guan)等(deng)多種。 無(wu)縫(feng)鋼(gang)(gang)(gang)管(guan)(guan)(guan)(guan)(guan)具有中(zhong)空(kong)(zhōng kōng)截面(mian)，大量(liang)用(yong)(yong)(yong)作輸(shu)送流體(ti)的(de)管(guan)(guan)(guan)(guan)(guan)道(Conduit)，如輸(shu)送石油、天然(natural)氣、煤氣(Coal Gas)、水及某些固體(ti)物料的(de)管(guan)(guan)(guan)(guan)(guan)道等(deng)。鋼(gang)(gang)(gang)管(guan)(guan)(guan)(guan)(guan)與圓(yuan)鋼(gang)(gang)(gang)等(deng)實心鋼(gang)(gang)(gang)材相比，在抗彎(wan)抗扭(niu)強度(strength)相同(tong)時，重量(liang)較輕(qing)，是一種經濟(Economy)截面(mian)鋼(gang)(gang)(gang)材。 廣(guang)泛(fan)(fan)(extensive)用(yong)(yong)(yong)于制造(zhì zào)結構(Structure)件(jian)和(he)機械(xie)(machinery)零件(jian)，如石油鉆桿、汽車(auto)傳(chuan)動軸(zhou)(傳(chuan)動軸(zhou)組成:軸(zhou)管(guan)(guan)(guan)(guan)(guan)、伸縮(suo)套(tao)和(he)萬向節(jie))、自行車架以及建筑(zhu)(Architecture)施工(gong)中(zhong)用(yong)(yong)(yong)的(de)鋼(gang)(gang)(gang)腳手架等(deng)用(yong)(yong)(yong)鋼(gang)(gang)(gang)管(guan)(guan)(guan)(guan)(guan)制造環形零件(jian)，可(ke)提高材料(Material)利用(yong)(yong)(yong)率(availability)，簡(jian)化(hua)制造工(gong)序(xu)，節(jie)約材料和(he)加工(gong)(Processing)工(gong)時，已(yi)廣(guang)泛(fan)(fan)用(yong)(yong)(yong)鋼(gang)(gang)(gang)管(guan)(guan)(guan)(guan)(guan)來(lai)制造。
