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)(leng)軋無(wu)縫(feng)(feng)鋼(gang)管、冷(leng)(leng)拔無(wu)縫(feng)(feng)鋼(gang)管、擠壓(ya)無(wu)縫(feng)(feng)鋼(gang)管、頂管等。無(wu)縫(feng)(feng)鋼(gang)管按截面形(xing)(xing)(xing)(xing)狀可分為圓形(xing)(xing)(xing)(xing)和異形(xing)(xing)(xing)(xing),異形(xing)(xing)(xing)(xing)管可分為方(fang)形(xing)(xing)(xing)(xing)、橢(tuo)圓形(xing)(xing)(xing)(xing)、橢(tuo)圓形(xing)(xing)(xing)(xing)和橢(tuo)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)、翅(chi)管等復雜形(xing)(xing)(xing)(xing)狀。
熱軋(ya)無縫鋼(gang)(gang)(gang)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)分為普通鋼(gang)(gang)(gang)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)、不(bu)銹鋼(gang)(gang)(gang)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)、高壓鍋爐(lu)鋼(gang)(gang)(gang)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)、中(zhong)壓鍋爐(lu)鋼(gang)(gang)(gang)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)、低壓鍋爐(lu)鋼(gang)(gang)(gang)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)、石油裂解管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)、合(he)(he)金(jin)鋼(gang)(gang)(gang)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)、地質鋼(gang)(gang)(gang)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)等。冷軋(ya)無縫鋼(gang)(gang)(gang)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)除合(he)(he)金(jin)鋼(gang)(gang)(gang)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)、普通鋼(gang)(gang)(gang)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)、石油裂解管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)、中(zhong)低壓鍋爐(lu)鋼(gang)(gang)(gang)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)、高壓鍋爐(lu)鋼(gang)(gang)(gang)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)、不(bu)銹鋼(gang)(gang)(gang)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)等鋼(gang)(gang)(gang)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)外,還(huan)包括不(bu)銹鋼(gang)(gang)(gang)薄(bo)壁(bi)鋼(gang)(gang)(gang)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)、碳薄(bo)壁(bi)鋼(gang)(gang)(gang)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)、,合(he)(he)金(jin)薄(bo)壁(bi)鋼(gang)(gang)(gang)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)和(he)異型鋼(gang)(gang)(gang)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)。
熱軋無縫(feng)管外徑一般(ban)大于32mm,壁(bi)(bi)厚(hou)在2.5-75mm之間,冷軋無縫(feng)管外徑可(ke)達6mm,壁(bi)(bi)厚(hou)可(ke)達0.25mm,薄壁(bi)(bi)管外徑可(ke)達5mm,壁(bi)(bi)厚(hou)小(xiao)于0.25mm。無縫(feng)鋼(gang)管由碳素結構鋼(gang)、低合(he)金(jin)結構鋼(gang)和(he)合(he)金(jin)結構鋼(gang)軋制而成,產量*高(gao)。無縫(feng)鋼(gang)管主要用作輸送流體的(de)管道或結構件。
無(wu)(wu)縫(feng)(feng)鋼管(guan)(guan)采用高(gao)(gao)精(jing)度(du)鋼材精(jing)心(xin)拉拔或冷(leng)軋。由于(yu)無(wu)(wu)縫(feng)(feng)鋼管(guan)(guan)的內壁(bi)(bi)和外壁(bi)(bi)沒有氧(yang)化層來承受(shou)這種高(gao)(gao)壓系(xi)統的優(you)點,無(wu)(wu)泄漏(lou)、精(jing)度(du)高(gao)(gao)、光潔度(du)高(gao)(gao)、冷(leng)彎變形(xing)、擴(kuo)口、壓扁和無(wu)(wu)裂紋,我(wo)們可(ke)(ke)以主要用于(yu)生(sheng)產過程中(zhong)的氣動或液壓元件產品,如氣缸或油缸,可(ke)(ke)以是無(wu)(wu)縫(feng)(feng)管(guan)(guan)或焊管(guan)(guan)。
含碳(tan)原子C、硅(gui)(SI)、錳(meng)、錳(meng)、硫、磷、磷、鉻和鉻的(de)(de)(de)無縫鋼(gang)的(de)(de)(de)化(hua)學成分(fen)。優質碳(tan)鋼(gang),精軋,無氧化(hua)發光(guang),熱(re)處(chu)(chu)理(li)(NBK狀態),無損(sun)分(fen)析和檢測,用專用網絡設備對鋼(gang)管內(nei)壁(bi)(bi)(bi)進(jin)行不(bu)同的(de)(de)(de)刷涂和高(gao)(gao)壓(ya)系統的(de)(de)(de)清洗(xi),在鋼(gang)管上涂防(fang)(fang)銹油進(jin)行防(fang)(fang)銹技術處(chu)(chu)理(li),并對兩端的(de)(de)(de)蓋子進(jin)行防(fang)(fang)塵處(chu)(chu)理(li)。管壁(bi)(bi)(bi)精度(du)高(gao)(gao),光(guang)潔度(du)高(gao)(gao)。熱(re)處(chu)(chu)理(li)后的(de)(de)(de)鋼(gang)沒(mei)有(you)氧化(hua)層。高(gao)(gao)潔凈鋼(gang)的(de)(de)(de)內(nei)壁(bi)(bi)(bi)承受高(gao)(gao)壓(ya)、冷變(bian)形、擴(kuo)口、無裂紋壓(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,以及用(yong)(yong)戶對(dui)高(gao)光潔度的要求。由于采用(yong)(yong)高(gao)精度無(wu)(wu)(wu)縫(feng)(feng)鋼(gang)管(guan),2-8號線可以保持公(gong)差,因(yin)此許(xu)多用(yong)(yong)戶都有加工站,以節省材(cai)料損耗。當使用(yong)(yong)無(wu)(wu)(wu)縫(feng)(feng)鋼(gang)管(guan)時,管(guan)子或棒材(cai)會慢慢轉變為無(wu)(wu)(wu)縫(feng)(feng)鋼(gang)管(guan)。
無縫(feng)鋼管(guan)中(zhong)的(de)元素對高溫(wen)(wen)回(hui)(hui)火脆性(xing)的(de)影響可分為(wei):具有高溫(wen)(wen)回(hui)(hui)火脆性(xing)的(de)無縫(feng)鋼管(guan)引發劑中(zhong)的(de)雜質元素,如磷、錫、銻(ti)等,以不同形式和(he)不同程度存在(zai),或減(jian)緩合(he)金元素的(de)高溫(wen)(wen)回(hui)(hui)火脆性(xing)。鉻(ge)、錳、鎳和(he)硅(gui)起(qi)(qi)促進作用(yong),鉬、鎢和(he)鈦起(qi)(qi)延(yan)遲作用(yong),碳也起(qi)(qi)重要作用(yong)。
高溫回(hui)火(huo)脆性無縫鋼管通常(chang)被認為(wei)是磷(lin)的(de)(de)特性,錫、銻、砷等(deng)雜質在奧氏體(ti)晶(jing)界(jie)(jie)偏析(xi),導致晶(jing)界(jie)(jie)脆性效(xiao)應。相反,鉬與磷(lin)等(deng)雜質元素有很強的(de)(de)相互(hu)作(zuo)用,可在晶(jing)體(ti)中(zhong)生成沉淀相,阻礙(ai)磷(lin)的(de)(de)晶(jing)界(jie)(jie)偏析(xi)。鈦更(geng)有效(xiao)地促進(jin)雜質元素的(de)(de)沉淀,如(ru)晶(jing)體(ti)中(zhong)的(de)(de)磷(lin),從而(er)削弱雜質元素的(de)(de)晶(jing)界(jie)(jie)偏析(xi),減緩回(hui)火(huo)脆性。
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,鉬含量降(jiang)低(di),基(ji)體脆化,但無縫鋼(gang)管的趨勢(shi)增加(jia)。