20號無縫鋼管在100℃與(yu)225℃溫度(temperature)的(de)許(xu)應力(li)的(de)區別
20號鋼(gang)許(xu)用(yong)應力：20號鋼(gang)在225℃下的(de)許(xu)用(yong)應力：(16-36mm)111-124MPa之間(jian);(6-16mm)之間(jian)117-131MPa
20號鋼在100℃下(xia)的(de)許(xu)用(yong)應(ying)力(li)(li)：150℃時,20號鋼鋼管的(de)許(xu)用(yong)應(ying)力(li)(li)為(wei)130 MPa,20號鋼鍛(duan)件(jian)的(de)許(xu)用(yong)應(ying)力(li)(li)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)素結構(gou)(Structure)鋼、低(di)合(he)金結構(gou)鋼或合(he)金結構(gou)鋼軋制(zhi)，產量最多，主要用作(zuo)輸送流體的(de)管(guan)道或結構(gou)零件。2、根據用途不同(tong)分三類供應：
A、按(an)化學(Chemistry)成分(fen)(ingredient)和機械(machinery)性能(xìng néng)供應(ying);
B、按機械(machinery)性能(xìng néng)供應;
C、按水壓試(shi)驗供應。GB9948無(wu)縫(feng)(feng)(feng)(feng)鋼(gang)(gang)(gang)管主要用(yong)(yong)來(lai)生產氣(qi)動或(huo)液壓 元件(jian)的產品，如(ru)氣(qi)缸或(huo)油缸，都是(shi)用(yong)(yong)無(wu)縫(feng)(feng)(feng)(feng)管。精(jing)密無(wu)縫(feng)(feng)(feng)(feng)鋼(gang)(gang)(gang)管的化學成分有碳C、硅(gui)Si、錳Mn、硫S、磷P、鉻Cr。GB5310無(wu)縫(feng)(feng)(feng)(feng)鋼(gang)(gang)(gang)管按照用(yong)(yong)途分為(wei)結構用(yong)(yong)無(wu)縫(feng)(feng)(feng)(feng)鋼(gang)(gang)(gang)管;輸送用(yong)(yong)無(wu)縫(feng)(feng)(feng)(feng)鋼(gang)(gang)(gang)管;鍋(guo)(guo)爐用(yong)(yong)無(wu)縫(feng)(feng)(feng)(feng)鋼(gang)(gang)(gang)管;鍋(guo)(guo)爐用(yong)(yong)高壓無(wu)縫(feng)(feng)(feng)(feng)鋼(gang)(gang)(gang)管.無(wu)縫(feng)(feng)(feng)(feng)鋼(gang)(gang)(gang)管按照斷面形(xing)(xing)(xing)(xing)狀(zhuang)，無(wu)縫(feng)(feng)(feng)(feng)鋼(gang)(gang)(gang)管分圓形(xing)(xing)(xing)(xing)和(he)異(yi)形(xing)(xing)(xing)(xing)兩種(zhong)，異(yi)形(xing)(xing)(xing)(xing)管有方形(xing)(xing)(xing)(xing)、橢(tuo)圓形(xing)(xing)(xing)(xing)、三角(jiao)(jiao)形(xing)(xing)(xing)(xing)、六(liu)角(jiao)(jiao)形(xing)(xing)(xing)(xing)、瓜子(zi)形(xing)(xing)(xing)(xing)、星形(xing)(xing)(xing)(xing)、 帶翅管多種(zhong)復雜(za)形(xing)(xing)(xing)(xing)狀(zhuang)。按
A、b類(lei)供應(ying)的鋼(gang)(gang)管(guan)(guan)(guan)，如(ru)用(yong)(yong)(yong)于(yu)承受液體壓力(pressure)，也要進行水壓(特指:壓強)試驗(yan)。3、專門用(yong)(yong)(yong)途的無(wu)縫(feng)管(guan)(guan)(guan)有(you)鍋爐(Boilers)用(yong)(yong)(yong)無(wu)縫(feng)管(guan)(guan)(guan)、化工(gong)電力用(yong)(yong)(yong)，地(di)質用(yong)(yong)(yong)無(wu)縫(feng)鋼(gang)(gang)管(guan)(guan)(guan)及石油(you)(petroleum)用(yong)(yong)(yong)無(wu)縫(feng)管(guan)(guan)(guan)等(deng)多種(zhong)。 無(wu)縫(feng)鋼(gang)(gang)管(guan)(guan)(guan)具(ju)有(you)中(zhong)空(zhōng kōng)截面(mian)(mian)，大(da)量用(yong)(yong)(yong)作輸送流(liu)體的管(guan)(guan)(guan)道(dao)(Conduit)，如(ru)輸送石油(you)、天然(natural)氣、煤氣(Coal Gas)、水及某(mou)些(xie)固體物(wu)料(liao)的管(guan)(guan)(guan)道(dao)等(deng)。鋼(gang)(gang)管(guan)(guan)(guan)與圓鋼(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，重量較輕，是一種(zhong)經濟(Economy)截面(mian)(mian)鋼(gang)(gang)材(cai)。 廣泛(extensive)用(yong)(yong)(yong)于(yu)制(zhi)造(zao)(zao)(zao)(zhì zào)結構(Structure)件和機械(xie)(machinery)零件，如(ru)石油(you)鉆桿、汽車(che)(che)(auto)傳動軸(zhou)(傳動軸(zhou)組(zu)成:軸(zhou)管(guan)(guan)(guan)、伸(shen)縮套和萬向節)、自行車(che)(che)架(jia)以及建(jian)筑(Architecture)施工(gong)中(zhong)用(yong)(yong)(yong)的鋼(gang)(gang)腳手架(jia)等(deng)用(yong)(yong)(yong)鋼(gang)(gang)管(guan)(guan)(guan)制(zhi)造(zao)(zao)(zao)環形(xing)零件，可提高材(cai)料(liao)(Material)利用(yong)(yong)(yong)率(availability)，簡化制(zhi)造(zao)(zao)(zao)工(gong)序，節約材(cai)料(liao)和加工(gong)(Processing)工(gong)時，已廣泛用(yong)(yong)(yong)鋼(gang)(gang)管(guan)(guan)(guan)來制(zhi)造(zao)(zao)(zao)。
