無縫鋼管的本質是?
無縫鋼管是由整根圓鋼穿孔,表面無焊縫的鋼管。無縫鋼管分為熱軋無縫鋼管、冷(leng)軋無縫鋼(gang)(gang)管、冷(leng)拔無縫鋼(gang)(gang)管、擠壓(ya)無縫鋼(gang)(gang)管、頂管等。無縫鋼(gang)(gang)管按截面形(xing)(xing)(xing)(xing)狀(zhuang)可(ke)(ke)分為圓形(xing)(xing)(xing)(xing)和異形(xing)(xing)(xing)(xing),異形(xing)(xing)(xing)(xing)管可(ke)(ke)分為方形(xing)(xing)(xing)(xing)、橢圓形(xing)(xing)(xing)(xing)、橢圓形(xing)(xing)(xing)(xing)和橢圓形(xing)(xing)(xing)(xing),三角形(xing)(xing)(xing)(xing)、六(liu)角形(xing)(xing)(xing)(xing)、瓜子形(xing)(xing)(xing)(xing)、星(xing)形(xing)(xing)(xing)(xing)、翅管等復雜形(xing)(xing)(xing)(xing)狀(zhuang)。
熱軋(ya)無(wu)縫鋼(gang)(gang)(gang)(gang)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)分(fen)為(wei)普通鋼(gang)(gang)(gang)(gang)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)、不銹鋼(gang)(gang)(gang)(gang)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)、高(gao)壓(ya)(ya)鍋(guo)(guo)爐(lu)鋼(gang)(gang)(gang)(gang)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)、中壓(ya)(ya)鍋(guo)(guo)爐(lu)鋼(gang)(gang)(gang)(gang)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)、低(di)壓(ya)(ya)鍋(guo)(guo)爐(lu)鋼(gang)(gang)(gang)(gang)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)、石油(you)裂(lie)解(jie)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)、合金(jin)鋼(gang)(gang)(gang)(gang)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)、地質鋼(gang)(gang)(gang)(gang)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)等(deng)。冷軋(ya)無(wu)縫鋼(gang)(gang)(gang)(gang)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)除合金(jin)鋼(gang)(gang)(gang)(gang)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)、普通鋼(gang)(gang)(gang)(gang)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)、石油(you)裂(lie)解(jie)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)、中低(di)壓(ya)(ya)鍋(guo)(guo)爐(lu)鋼(gang)(gang)(gang)(gang)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)、高(gao)壓(ya)(ya)鍋(guo)(guo)爐(lu)鋼(gang)(gang)(gang)(gang)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)、不銹鋼(gang)(gang)(gang)(gang)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)等(deng)鋼(gang)(gang)(gang)(gang)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)外,還包括(kuo)不銹鋼(gang)(gang)(gang)(gang)薄(bo)(bo)(bo)壁鋼(gang)(gang)(gang)(gang)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)、碳薄(bo)(bo)(bo)壁鋼(gang)(gang)(gang)(gang)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)、,合金(jin)薄(bo)(bo)(bo)壁鋼(gang)(gang)(gang)(gang)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)和異型鋼(gang)(gang)(gang)(gang)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)。
熱軋無(wu)縫管外(wai)徑(jing)(jing)一般大于32mm,壁厚(hou)在2.5-75mm之間,冷軋無(wu)縫管外(wai)徑(jing)(jing)可(ke)達6mm,壁厚(hou)可(ke)達0.25mm,薄壁管外(wai)徑(jing)(jing)可(ke)達5mm,壁厚(hou)小于0.25mm。無(wu)縫鋼(gang)管由碳素結(jie)(jie)構(gou)鋼(gang)、低(di)合金結(jie)(jie)構(gou)鋼(gang)和合金結(jie)(jie)構(gou)鋼(gang)軋制而成,產(chan)量*高。無(wu)縫鋼(gang)管主(zhu)要用(yong)作輸送流(liu)體(ti)的管道或結(jie)(jie)構(gou)件(jian)。
無縫(feng)鋼(gang)管(guan)采用(yong)高精度鋼(gang)材(cai)精心拉拔或(huo)冷軋。由(you)于無縫(feng)鋼(gang)管(guan)的(de)內壁和外壁沒有氧化(hua)層來(lai)承(cheng)受(shou)這種高壓系統(tong)的(de)優點,無泄漏、精度高、光潔度高、冷彎變形、擴口(kou)、壓扁和無裂紋,我(wo)們可以(yi)主要用(yong)于生(sheng)產過程中的(de)氣動或(huo)液(ye)壓元件產品,如(ru)氣缸或(huo)油缸,可以(yi)是(shi)無縫(feng)管(guan)或(huo)焊管(guan)。
含碳原子(zi)C、硅(SI)、錳(meng)、錳(meng)、硫(liu)、磷、磷、鉻和鉻的無(wu)(wu)縫鋼(gang)的化(hua)(hua)學(xue)成分(fen)(fen)。優質碳鋼(gang),精(jing)軋,無(wu)(wu)氧化(hua)(hua)發(fa)光(guang),熱處(chu)理(NBK狀(zhuang)態(tai)),無(wu)(wu)損分(fen)(fen)析和檢測,用(yong)(yong)專用(yong)(yong)網絡(luo)設備對(dui)鋼(gang)管(guan)內壁(bi)進(jin)行(xing)不同的刷(shua)涂和高壓(ya)(ya)系統的清洗(xi),在鋼(gang)管(guan)上(shang)涂防(fang)銹油進(jin)行(xing)防(fang)銹技(ji)術處(chu)理,并(bing)對(dui)兩端(duan)的蓋子(zi)進(jin)行(xing)防(fang)塵處(chu)理。管(guan)壁(bi)精(jing)度高,光(guang)潔度高。熱處(chu)理后的鋼(gang)沒有(you)氧化(hua)(hua)層。高潔凈(jing)鋼(gang)的內壁(bi)承受(shou)高壓(ya)(ya)、冷變形、擴口、無(wu)(wu)裂紋壓(ya)(ya)扁
主要用途:汽車、機械設備配件等對鋼管精度和光潔度有較高技術要求的機械。用戶只需要精密鋼管的精度,以(yi)及用戶(hu)對高光(guang)潔度的要(yao)求。由于(yu)采用高精度無縫鋼(gang)管(guan)(guan),2-8號(hao)線可以(yi)保持公(gong)差(cha),因此許多用戶(hu)都(dou)有加工站,以(yi)節省材料損耗。當使用無縫鋼(gang)管(guan)(guan)時(shi),管(guan)(guan)子或棒材會慢慢轉變(bian)為無縫鋼(gang)管(guan)(guan)。
無縫鋼管中的(de)(de)元(yuan)(yuan)素對高(gao)溫回(hui)火(huo)(huo)脆性(xing)的(de)(de)影響可分為:具有(you)高(gao)溫回(hui)火(huo)(huo)脆性(xing)的(de)(de)無縫鋼管引發劑中的(de)(de)雜質元(yuan)(yuan)素,如磷(lin)、錫、銻等(deng),以不(bu)同形式和不(bu)同程度存在(zai),或減(jian)緩合金元(yuan)(yuan)素的(de)(de)高(gao)溫回(hui)火(huo)(huo)脆性(xing)。鉻、錳、鎳和硅起促(cu)進(jin)作(zuo)用,鉬、鎢和鈦起延遲作(zuo)用,碳也(ye)起重要(yao)作(zuo)用。
高溫回(hui)火(huo)(huo)脆性(xing)無縫鋼管通(tong)常被認為是磷的(de)特性(xing),錫、銻、砷(shen)等雜質(zhi)(zhi)在(zai)奧(ao)氏體(ti)晶(jing)界偏(pian)析(xi),導致晶(jing)界脆性(xing)效應。相(xiang)反,鉬與磷等雜質(zhi)(zhi)元(yuan)素有很強的(de)相(xiang)互作用,可在(zai)晶(jing)體(ti)中(zhong)生成沉淀(dian)相(xiang),阻(zu)礙磷的(de)晶(jing)界偏(pian)析(xi)。鈦(tai)更有效地促進(jin)雜質(zhi)(zhi)元(yuan)素的(de)沉淀(dian),如晶(jing)體(ti)中(zhong)的(de)磷,從而削弱雜質(zhi)(zhi)元(yuan)素的(de)晶(jing)界偏(pian)析(xi),減緩回(hui)火(huo)(huo)脆性(xing)。
降低無縫鋼管高溫回火脆性的措施有:高溫回火后,用油冷卻或水快速改善冷卻,以抑制其他雜質和主要元素在晶界的偏析;對于含鉬品種,當鋼中鉬含量增加到無縫鋼管的0.7%時,高溫回火脆化傾向顯著降低。超過這一極限,特殊碳化物形成富含鉬的20號精密鋼管,鉬含(han)量降低,基體脆化,但無縫鋼管(guan)的趨勢(shi)增加。