20號無縫鋼管在(zai)100℃與225℃溫度(du)(temperature)的許應力的區別(bie)
20號鋼許(xu)用應力(li)：20號鋼在225℃下的許(xu)用應力(li)：(16-36mm)111-124MPa之間;(6-16mm)之間117-131MPa
20號鋼(gang)在100℃下的(de)許用應力：150℃時,20號鋼(gang)鋼(gang)管(guan)的(de)許用應力為(wei)(wei)130 MPa,20號鋼(gang)鍛件的(de)許用應力為(wei)(wei)108MPa
無縫鋼管用途很廣泛(extensive)。一般用途的無縫鋼管由(you)普(pu)通(tong)的碳(C)素結(jie)構(Structure)鋼、低合(he)金(jin)結(jie)構鋼或合(he)金(jin)結(jie)構鋼軋(ya)制，產量最多，主(zhu)要用(yong)作輸(shu)送流(liu)體的管道或結(jie)構零件。2、根據用(yong)途不同分三(san)類供應：
A、按(an)化(hua)學(Chemistry)成分(fen)(ingredient)和機械(xie)(machinery)性能(xìng néng)供應;
B、按機械(machinery)性能(xìng néng)供應;
C、按(an)(an)水壓(ya)(ya)試驗供應(ying)。GB9948無(wu)(wu)(wu)縫(feng)(feng)鋼(gang)(gang)(gang)管(guan)(guan)主要(yao)用來生產氣動(dong)或液壓(ya)(ya) 元件的產品(pin)，如氣缸或油缸，都是用無(wu)(wu)(wu)縫(feng)(feng)管(guan)(guan)。精密(mi)無(wu)(wu)(wu)縫(feng)(feng)鋼(gang)(gang)(gang)管(guan)(guan)的化學成分有(you)碳C、硅Si、錳Mn、硫S、磷(lin)P、鉻Cr。GB5310無(wu)(wu)(wu)縫(feng)(feng)鋼(gang)(gang)(gang)管(guan)(guan)按(an)(an)照用途(tu)分為結構用無(wu)(wu)(wu)縫(feng)(feng)鋼(gang)(gang)(gang)管(guan)(guan);輸送用無(wu)(wu)(wu)縫(feng)(feng)鋼(gang)(gang)(gang)管(guan)(guan);鍋爐(lu)用無(wu)(wu)(wu)縫(feng)(feng)鋼(gang)(gang)(gang)管(guan)(guan);鍋爐(lu)用高壓(ya)(ya)無(wu)(wu)(wu)縫(feng)(feng)鋼(gang)(gang)(gang)管(guan)(guan).無(wu)(wu)(wu)縫(feng)(feng)鋼(gang)(gang)(gang)管(guan)(guan)按(an)(an)照斷(duan)面形(xing)(xing)(xing)狀，無(wu)(wu)(wu)縫(feng)(feng)鋼(gang)(gang)(gang)管(guan)(guan)分圓(yuan)形(xing)(xing)(xing)和異形(xing)(xing)(xing)兩(liang)種(zhong)，異形(xing)(xing)(xing)管(guan)(guan)有(you)方形(xing)(xing)(xing)、橢(tuo)圓(yuan)形(xing)(xing)(xing)、三角形(xing)(xing)(xing)、六(liu)角形(xing)(xing)(xing)、瓜子形(xing)(xing)(xing)、星形(xing)(xing)(xing)、 帶翅管(guan)(guan)多種(zhong)復雜形(xing)(xing)(xing)狀。按(an)(an)
A、b類(lei)供(gong)應的(de)鋼(gang)管(guan)，如(ru)用(yong)(yong)(yong)(yong)于(yu)承受液體壓(ya)力(li)(pressure)，也要進(jin)行水(shui)壓(ya)(特指:壓(ya)強)試(shi)驗(yan)。3、專(zhuan)門用(yong)(yong)(yong)(yong)途的(de)無(wu)(wu)縫(feng)管(guan)有鍋爐(Boilers)用(yong)(yong)(yong)(yong)無(wu)(wu)縫(feng)管(guan)、化(hua)(hua)工(gong)電力(li)用(yong)(yong)(yong)(yong)，地質(zhi)用(yong)(yong)(yong)(yong)無(wu)(wu)縫(feng)鋼(gang)管(guan)及(ji)(ji)石油(petroleum)用(yong)(yong)(yong)(yong)無(wu)(wu)縫(feng)管(guan)等多種。 無(wu)(wu)縫(feng)鋼(gang)管(guan)具有中空(zhōng kōng)截(jie)面，大量(liang)用(yong)(yong)(yong)(yong)作輸送流體的(de)管(guan)道(Conduit)，如(ru)輸送石油、天然(natural)氣、煤氣(Coal Gas)、水(shui)及(ji)(ji)某些(xie)固體物(wu)料(liao)的(de)管(guan)道等。鋼(gang)管(guan)與(yu)圓鋼(gang)等實心鋼(gang)材相比，在(zai)抗彎抗扭強度(strength)相同時，重量(liang)較輕，是(shi)一(yi)種經(jing)濟(Economy)截(jie)面鋼(gang)材。 廣(guang)泛(extensive)用(yong)(yong)(yong)(yong)于(yu)制(zhi)造(zao)(zao)(zhì zào)結(jie)構(Structure)件和機械(machinery)零(ling)件，如(ru)石油鉆桿、汽車(auto)傳動軸(傳動軸組成:軸管(guan)、伸縮套和萬向節(jie))、自行車架(jia)以及(ji)(ji)建(jian)筑(Architecture)施(shi)工(gong)中用(yong)(yong)(yong)(yong)的(de)鋼(gang)腳手架(jia)等用(yong)(yong)(yong)(yong)鋼(gang)管(guan)制(zhi)造(zao)(zao)環形(xing)零(ling)件，可提高材料(liao)(Material)利用(yong)(yong)(yong)(yong)率(lv)(availability)，簡化(hua)(hua)制(zhi)造(zao)(zao)工(gong)序，節(jie)約材料(liao)和加工(gong)(Processing)工(gong)時，已廣(guang)泛用(yong)(yong)(yong)(yong)鋼(gang)管(guan)來(lai)制(zhi)造(zao)(zao)。
