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，無縫鋼管分圓形(xing)(xing)(xing)(xing)和異(yi)形(xing)(xing)(xing)(xing)兩種(zhong)(zhong)，異(yi)形(xing)(xing)(xing)(xing)管(guan)有方形(xing)(xing)(xing)(xing)、橢圓形(xing)(xing)(xing)(xing)、三(san)角形(xing)(xing)(xing)(xing)、六角形(xing)(xing)(xing)(xing)、瓜子形(xing)(xing)(xing)(xing)、星形(xing)(xing)(xing)(xing)、 帶翅管(guan)多種(zhong)(zhong)復(fu)雜形(xing)(xing)(xing)(xing)狀。GB9948無縫鋼(gang)(gang)管(guan)主(zhu)要用(yong)來生產氣(qi)動或(huo)液壓 元件的產品，如(ru)氣(qi)缸或(huo)油缸，都是(shi)用(yong)無縫管(guan)。精密無縫鋼(gang)(gang)管(guan)的化學成分有碳C、硅Si、錳Mn、硫S、磷(lin)P、鉻Cr。B3087無縫鋼(gang)(gang)管(guan)無縫鋼(gang)(gang)管(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)性能(xìng néng)：抗拉強度(du)(strength) σb (MPa)：≥410(42)屈(qu)服(fu)強度(du)(strength) σs (MPa)：≥245(25)伸長(chang)率 δ5 (%)：≥25斷面收縮率 ψ (%)：≥5，硬度(du)(Hardness) ：未熱處理(processing),≤156HB，試(shi)樣尺(chi)寸：試(shi)樣尺(chi)寸25mm 20#無(wu)縫鋼管現貨(huo) 規(gui)格(specifications)規(gui)格(specifications)規(gui)格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
一般用(yong)(yong)途的(de)無縫鋼管(guan)(guan)(guan)由普(pu)通(tong)的(de)碳素結構(gou)鋼、低合金結構(gou)鋼或(huo)合金結構(gou)鋼軋(ya)制(zhi)，產量(liang)最(zui)多，主要用(yong)(yong)作輸送(song)流體(ti)的(de)管(guan)(guan)(guan)道或(huo)結構(gou)零件。最(zui)小±0.50 mm D3 ±0.75%.最(zui)小±0.30 mm D4 ±0.50%。最(zui)小±0.10 mm 無縫鋼管(guan)(guan)(guan)工(gong)藝( technology)流程(cheng)(cheng)衛生(hygienism)級(ji)鏡(jing)面管(guan)(guan)(guan)工(gong)藝( technology)流程(cheng)(cheng)：管(guan)(guan)(guan)坯(pi)——檢(jian)驗——剝(bo)(bo)皮——檢(jian)驗——加熱(heating )——穿孔(kong)——酸(suan)(Acerbity)洗(xi)——修(xiu)磨——潤滑(lubrication)風(feng)干——焊(han)頭——冷(leng)拔(ba)(ba)——固(gu)溶處理(processing)——酸(suan)(Acerbity)洗(xi)——酸(suan)洗(xi)鈍化(hua)(Inactivation)——檢(jian)驗——冷(leng)軋(ya)——去(qu)油——切(qie)頭——風(feng)干——內拋光(guang)(解釋(shi):磨擦(ca)使(shi)物(wu)體(ti)(如金器)光(guang)滑的(de)過程(cheng)(cheng))——外拋光(guang)(解釋(shi):磨擦(ca)使(shi)物(wu)體(ti)(如金器)光(guang)滑的(de)過程(cheng)(cheng))——檢(jian)驗——標識——成品包(bao)裝(packaging) 工(gong)業管(guan)(guan)(guan)工(gong)藝流程(cheng)(cheng) 管(guan)(guan)(guan)坯(pi)——檢(jian)驗——剝(bo)(bo)皮——檢(jian)驗——加熱(heating )——穿孔(kong)——酸(suan)洗(xi)——修(xiu)蘑——潤滑(lubrication)風(feng)干——焊(han)頭——冷(leng)拔(ba)(ba)——固(gu)溶處理——酸(suan)洗(xi)——酸(suan)洗(xi)鈍化(hua)(Inactivation)——檢(jian)驗
