精拔無縫鋼管一米起售
精拔無縫鋼管主要特點是無焊接縫,可承受較大的壓力。產品可以是很粗糙的鑄態或冷撥件。精拔無縫鋼管是近(jin)幾年(nian)出現的產(chan)品,主要是內(nei)孔、外壁尺寸有嚴格(ge)的公差及粗糙度。
精(jing)拔(ba)無(wu)縫鋼管是一(yi)(yi)種(zhong)通過精(jing)拔(ba)或(huo)冷(leng)軋(ya)處理后的一(yi)(yi)種(zhong)高精(jing)密(mi)的鋼管材(cai)料。由于精(jing)拔(ba)無(wu)縫鋼管內外壁無(wu)氧化(hua)層、承(cheng)受高壓無(wu)泄漏、高精(jing)度、高光潔度、冷(leng)彎不變(bian)形、擴口、壓扁無(wu)裂縫等有點,主要(yao)用來生產氣動或(huo)液(ye)壓 元件的產品,如氣缸或(huo)油缸,可以是無(wu)縫管,也(ye)有焊接管。
特點
1.外徑更小。
2.精度高可做小(xiao)批量生
3.冷拔(ba)成(cheng)品精度高,表(biao)面質量好(hao)。
4.精拔無(wu)縫鋼管橫面積更復雜(za)。
5.鋼管性(xing)能更優(you)越,金屬比較密。
精拔無(wu)(wu)縫鋼(gang)(gang)(gang)管(guan)(guan)低(di)(di)溫(wen)(wen)回(hui)(hui)(hui)(hui)(hui)火(huo)脆(cui)(cui)(cui)(cui)(cui)性 合金(jin)鋼(gang)(gang)(gang)淬火(huo)得到(dao)馬(ma)氏體(ti)(ti)組織后,在(zai)250~400℃溫(wen)(wen)度范圍回(hui)(hui)(hui)(hui)(hui)火(huo)使鋼(gang)(gang)(gang)脆(cui)(cui)(cui)(cui)(cui)化(hua),其韌性一脆(cui)(cui)(cui)(cui)(cui)性轉化(hua)溫(wen)(wen)度明顯升高(gao)。已脆(cui)(cui)(cui)(cui)(cui)化(hua)的精拔無(wu)(wu)縫鋼(gang)(gang)(gang)管(guan)(guan)不能再用(yong)低(di)(di)溫(wen)(wen)回(hui)(hui)(hui)(hui)(hui)火(huo)加熱的方法消除,故又(you)稱為%26ldquo;不可逆回(hui)(hui)(hui)(hui)(hui)火(huo)脆(cui)(cui)(cui)(cui)(cui)性%26rdquo;。精拔無(wu)(wu)縫鋼(gang)(gang)(gang)管(guan)(guan)主要(yao)發生(sheng)在(zai)合金(jin)結構鋼(gang)(gang)(gang)和(he)低(di)(di)合金(jin)超高(gao)強度精拔無(wu)(wu)縫鋼(gang)(gang)(gang)管(guan)(guan)等鋼(gang)(gang)(gang)種。已脆(cui)(cui)(cui)(cui)(cui)化(hua)精拔無(wu)(wu)縫鋼(gang)(gang)(gang)管(guan)(guan)的斷口(kou)(kou)(kou)是沿晶(jing)(jing)(jing)斷口(kou)(kou)(kou)或是沿晶(jing)(jing)(jing)和(he)準(zhun)解理混合斷口(kou)(kou)(kou)。產(chan)生(sheng)低(di)(di)溫(wen)(wen)回(hui)(hui)(hui)(hui)(hui)火(huo)脆(cui)(cui)(cui)(cui)(cui)性的原(yuan)因,普遍認為:(1)與滲碳(tan)體(ti)(ti)在(zai)低(di)(di)溫(wen)(wen)回(hui)(hui)(hui)(hui)(hui)火(huo)時以(yi)薄片狀在(zai)原(yuan)奧(ao)(ao)氏體(ti)(ti)晶(jing)(jing)(jing)界析(xi)出,造(zao)成晶(jing)(jing)(jing)界脆(cui)(cui)(cui)(cui)(cui)化(hua)密(mi)切相關。(2)雜質元素磷(lin)等在(zai)原(yuan)奧(ao)(ao)氏體(ti)(ti)晶(jing)(jing)(jing)界偏聚(ju)也(ye)是造(zao)成低(di)(di)溫(wen)(wen)回(hui)(hui)(hui)(hui)(hui)火(huo)脆(cui)(cui)(cui)(cui)(cui)性原(yuan)因之一。含磷(lin)低(di)(di)于0.005%的高(gao)純度精拔無(wu)(wu)縫鋼(gang)(gang)(gang)管(guan)(guan)并(bing)不產(chan)生(sheng)低(di)(di)溫(wen)(wen)回(hui)(hui)(hui)(hui)(hui)火(huo)脆(cui)(cui)(cui)(cui)(cui)性。磷(lin)在(zai)火(huo)加熱時發生(sheng)奧(ao)(ao)氏體(ti)(ti)晶(jing)(jing)(jing)界偏聚(ju),淬火(huo)后保留下來(lai)。磷(lin)在(zai)原(yuan)奧(ao)(ao)氏體(ti)(ti)晶(jing)(jing)(jing)界偏聚(ju)和(he)滲碳(tan)體(ti)(ti)回(hui)(hui)(hui)(hui)(hui)火(huo)時在(zai)原(yuan)奧(ao)(ao)氏體(ti)(ti)晶(jing)(jing)(jing)界析(xi)出,這兩個因素造(zao)成沿晶(jing)(jing)(jing)脆(cui)(cui)(cui)(cui)(cui)斷,促成了精拔無(wu)(wu)縫鋼(gang)(gang)(gang)管(guan)(guan)低(di)(di)溫(wen)(wen)回(hui)(hui)(hui)(hui)(hui)火(huo)脆(cui)(cui)(cui)(cui)(cui)性的發生(sheng)。
精(jing)拔無縫(feng)鋼管中合金(jin)元素對低(di)(di)溫(wen)(wen)(wen)(wen)回(hui)火脆(cui)性(xing)產生較大的(de)影響(xiang)。鉻和錳(meng)促進雜質元素磷等(deng)在(zai)奧氏體晶界偏(pian)聚,從(cong)而促進低(di)(di)溫(wen)(wen)(wen)(wen)回(hui)火脆(cui)性(xing),鎢和釩基本上沒有影響(xiang),鉬降低(di)(di)低(di)(di)溫(wen)(wen)(wen)(wen)回(hui)火精(jing)拔無縫(feng)鋼管的(de)韌性(xing)一脆(cui)性(xing)轉化溫(wen)(wen)(wen)(wen)度,但尚不足(zu)以抑制(zhi)低(di)(di)溫(wen)(wen)(wen)(wen)回(hui)火脆(cui)性(xing)。硅能(neng)推(tui)遲回(hui)火時滲碳(tan)體析出,提高(gao)其生成溫(wen)(wen)(wen)(wen)度,故可提高(gao)精(jing)拔無縫(feng)鋼管低(di)(di)溫(wen)(wen)(wen)(wen)回(hui)火脆(cui)性(xing)發生的(de)溫(wen)(wen)(wen)(wen)度。