20#無縫鋼管尺寸及偏差
20#無縫鋼管尺寸及允許偏差，偏差等級 標準化外徑(外緣直徑)允許偏差 D1 ±1.5%，最小±0.75 mm D2 ±1.0%。無縫鋼管按照斷面形狀，無縫鋼管分圓(yuan)形(xing)(xing)(xing)和異(yi)形(xing)(xing)(xing)兩種(zhong)，異(yi)形(xing)(xing)(xing)管(guan)(guan)(guan)(guan)有方形(xing)(xing)(xing)、橢圓(yuan)形(xing)(xing)(xing)、三角(jiao)形(xing)(xing)(xing)、六角(jiao)形(xing)(xing)(xing)、瓜子形(xing)(xing)(xing)、星形(xing)(xing)(xing)、 帶翅管(guan)(guan)(guan)(guan)多(duo)種(zhong)復雜形(xing)(xing)(xing)狀。GB9948無(wu)(wu)(wu)(wu)縫(feng)(feng)鋼(gang)管(guan)(guan)(guan)(guan)主要用(yong)來生產氣動或液壓 元件的產品，如氣缸或油缸，都(dou)是用(yong)無(wu)(wu)(wu)(wu)縫(feng)(feng)管(guan)(guan)(guan)(guan)。精(jing)密無(wu)(wu)(wu)(wu)縫(feng)(feng)鋼(gang)管(guan)(guan)(guan)(guan)的化學成分有碳C、硅Si、錳Mn、硫(liu)S、磷P、鉻Cr。B3087無(wu)(wu)(wu)(wu)縫(feng)(feng)鋼(gang)管(guan)(guan)(guan)(guan)無(wu)(wu)(wu)(wu)縫(feng)(feng)鋼(gang)管(guan)(guan)(guan)(guan)用(yong)途很廣泛。
20#無縫鋼管屈服強度(strength)(MPa)：≥245(25) 20#無縫鋼管力學(xue)性(xing)能(xìng néng)：抗拉強(qiang)度(du)(strength) σb (MPa)：≥410(42)屈(qu)服(fu)強(qiang)度(du)(strength) σs (MPa)：≥245(25)伸長率(lv) δ5 (%)：≥25斷(duan)面收(shou)縮率(lv) ψ (%)：≥5，硬度(du)(Hardness) ：未熱處理(processing),≤156HB，試樣(yang)(yang)尺寸(cun)：試樣(yang)(yang)尺寸(cun)25mm 20#無縫鋼(gang)管現貨 規(gui)格(ge)(specifications)規(gui)格(ge)(specifications)規(gui)格(ge)194*11245*18325*12219*6245*20325*13219*6.5273*7325*14219*7273*8325*15219*8273*9325*16219*9273*9.5325*18219*10273*10325*20219*11273*11325*25219*12273*12351*10219*13273*13377*9219*14273*14377*10219*15273*15377*11219*16273*16377*12219*18273*18377*13219*20273*20377*14219*25273*25377*15245*7273*30377*16245*8273*36377*17245*9299*12377*25245*10325*8426*8245*12325*9426*9245*14325*10426*10
一般(ban)用途的(de)無(wu)縫(feng)鋼(gang)管由(you)普通的(de)碳素(su)結(jie)構(gou)鋼(gang)、低合金(jin)(jin)結(jie)構(gou)鋼(gang)或(huo)合金(jin)(jin)結(jie)構(gou)鋼(gang)軋制，產(chan)量最多，主要用作輸送流體的(de)管道或(huo)結(jie)構(gou)零件(jian)。最小(xiao)±0.50 mm D3 ±0.75%.最小(xiao)±0.30 mm D4 ±0.50%。最小(xiao)±0.10 mm 無(wu)縫(feng)鋼(gang)管工(gong)藝(yi)(yi)( technology)流程衛生(hygienism)級鏡面(mian)管工(gong)藝(yi)(yi)( technology)流程：管坯——檢(jian)(jian)(jian)驗(yan)——剝皮——檢(jian)(jian)(jian)驗(yan)——加熱(re)(heating )——穿孔——酸(suan)(Acerbity)洗(xi)——修磨——潤滑(lubrication)風(feng)干——焊頭(tou)(tou)——冷(leng)拔——固(gu)(gu)溶處理(li)(li)(processing)——酸(suan)(Acerbity)洗(xi)——酸(suan)洗(xi)鈍(dun)化(Inactivation)——檢(jian)(jian)(jian)驗(yan)——冷(leng)軋——去油——切(qie)頭(tou)(tou)——風(feng)干——內拋光(guang)(guang)(解(jie)釋:磨擦(ca)使物體(如(ru)金(jin)(jin)器)光(guang)(guang)滑的(de)過(guo)程)——外拋光(guang)(guang)(解(jie)釋:磨擦(ca)使物體(如(ru)金(jin)(jin)器)光(guang)(guang)滑的(de)過(guo)程)——檢(jian)(jian)(jian)驗(yan)——標(biao)識——成品包裝(packaging) 工(gong)業管工(gong)藝(yi)(yi)流程 管坯——檢(jian)(jian)(jian)驗(yan)——剝皮——檢(jian)(jian)(jian)驗(yan)——加熱(re)(heating )——穿孔——酸(suan)洗(xi)——修蘑——潤滑(lubrication)風(feng)干——焊頭(tou)(tou)——冷(leng)拔——固(gu)(gu)溶處理(li)(li)——酸(suan)洗(xi)——酸(suan)洗(xi)鈍(dun)化(Inactivation)——檢(jian)(jian)(jian)驗(yan)
