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。精拔無縫鋼管是近幾(ji)年出現的(de)(de)產品(pin)，主要是內孔、外壁尺寸有嚴(yan)格(ge)的(de)(de)公差及粗糙度。

　　精拔無縫(feng)鋼管(guan)是一種通過精拔或(huo)(huo)(huo)冷軋處理后的一種高(gao)(gao)精密的鋼管(guan)材料。由于精拔無縫(feng)鋼管(guan)內外(wai)壁無氧化層(ceng)、承受高(gao)(gao)壓(ya)無泄漏、高(gao)(gao)精度、高(gao)(gao)光潔(jie)度、冷彎不變形(xing)、擴口、壓(ya)扁無裂縫(feng)等有點，主要用(yong)來(lai)生產氣動或(huo)(huo)(huo)液壓(ya) 元件(jian)的產品，如氣缸或(huo)(huo)(huo)油缸，可(ke)以是無縫(feng)管(guan)，也有焊接管(guan)。

　　特點

　　1.外徑更小。

　　2.精(jing)度高可做小批量生

　　3.冷(leng)拔(ba)成品精度高，表面質量好。

　　4.精拔無縫鋼管(guan)橫面積更復雜(za)。

　　5.鋼管性能更優越，金屬比較密。

　　精(jing)(jing)拔(ba)(ba)無(wu)(wu)(wu)縫(feng)鋼(gang)(gang)(gang)(gang)管低(di)(di)溫(wen)(wen)(wen)(wen)(wen)(wen)回(hui)(hui)火(huo)脆(cui)(cui)(cui)性 合金鋼(gang)(gang)(gang)(gang)淬火(huo)得到馬氏(shi)(shi)體(ti)(ti)(ti)組織后，在(zai)(zai)250～400℃溫(wen)(wen)(wen)(wen)(wen)(wen)度(du)范圍回(hui)(hui)火(huo)使鋼(gang)(gang)(gang)(gang)脆(cui)(cui)(cui)化(hua)，其韌(ren)性一(yi)脆(cui)(cui)(cui)性轉化(hua)溫(wen)(wen)(wen)(wen)(wen)(wen)度(du)明(ming)顯升高。已脆(cui)(cui)(cui)化(hua)的精(jing)(jing)拔(ba)(ba)無(wu)(wu)(wu)縫(feng)鋼(gang)(gang)(gang)(gang)管不(bu)能再用低(di)(di)溫(wen)(wen)(wen)(wen)(wen)(wen)回(hui)(hui)火(huo)加熱的方(fang)法消除，故又稱為%26ldquo;不(bu)可逆回(hui)(hui)火(huo)脆(cui)(cui)(cui)性%26rdquo;。精(jing)(jing)拔(ba)(ba)無(wu)(wu)(wu)縫(feng)鋼(gang)(gang)(gang)(gang)管主要發生(sheng)在(zai)(zai)合金結構鋼(gang)(gang)(gang)(gang)和(he)低(di)(di)合金超(chao)高強度(du)精(jing)(jing)拔(ba)(ba)無(wu)(wu)(wu)縫(feng)鋼(gang)(gang)(gang)(gang)管等鋼(gang)(gang)(gang)(gang)種。已脆(cui)(cui)(cui)化(hua)精(jing)(jing)拔(ba)(ba)無(wu)(wu)(wu)縫(feng)鋼(gang)(gang)(gang)(gang)管的斷口(kou)是沿晶(jing)斷口(kou)或是沿晶(jing)和(he)準解理混合斷口(kou)。產生(sheng)低(di)(di)溫(wen)(wen)(wen)(wen)(wen)(wen)回(hui)(hui)火(huo)脆(cui)(cui)(cui)性的原(yuan)(yuan)因，普遍認為：(1)與滲(shen)碳(tan)體(ti)(ti)(ti)在(zai)(zai)低(di)(di)溫(wen)(wen)(wen)(wen)(wen)(wen)回(hui)(hui)火(huo)時(shi)以薄片狀在(zai)(zai)原(yuan)(yuan)奧(ao)氏(shi)(shi)體(ti)(ti)(ti)晶(jing)界(jie)析出，造(zao)成(cheng)晶(jing)界(jie)脆(cui)(cui)(cui)化(hua)密切相關。(2)雜質(zhi)元素磷等在(zai)(zai)原(yuan)(yuan)奧(ao)氏(shi)(shi)體(ti)(ti)(ti)晶(jing)界(jie)偏聚(ju)(ju)也(ye)是造(zao)成(cheng)低(di)(di)溫(wen)(wen)(wen)(wen)(wen)(wen)回(hui)(hui)火(huo)脆(cui)(cui)(cui)性原(yuan)(yuan)因之一(yi)。含磷低(di)(di)于0.005%的高純度(du)精(jing)(jing)拔(ba)(ba)無(wu)(wu)(wu)縫(feng)鋼(gang)(gang)(gang)(gang)管并不(bu)產生(sheng)低(di)(di)溫(wen)(wen)(wen)(wen)(wen)(wen)回(hui)(hui)火(huo)脆(cui)(cui)(cui)性。磷在(zai)(zai)火(huo)加熱時(shi)發生(sheng)奧(ao)氏(shi)(shi)體(ti)(ti)(ti)晶(jing)界(jie)偏聚(ju)(ju)，淬火(huo)后保留下來。磷在(zai)(zai)原(yuan)(yuan)奧(ao)氏(shi)(shi)體(ti)(ti)(ti)晶(jing)界(jie)偏聚(ju)(ju)和(he)滲(shen)碳(tan)體(ti)(ti)(ti)回(hui)(hui)火(huo)時(shi)在(zai)(zai)原(yuan)(yuan)奧(ao)氏(shi)(shi)體(ti)(ti)(ti)晶(jing)界(jie)析出，這兩個因素造(zao)成(cheng)沿晶(jing)脆(cui)(cui)(cui)斷，促(cu)成(cheng)了精(jing)(jing)拔(ba)(ba)無(wu)(wu)(wu)縫(feng)鋼(gang)(gang)(gang)(gang)管低(di)(di)溫(wen)(wen)(wen)(wen)(wen)(wen)回(hui)(hui)火(huo)脆(cui)(cui)(cui)性的發生(sheng)。

　　精(jing)拔無(wu)縫(feng)鋼(gang)管(guan)(guan)中合金元(yuan)素對低(di)(di)(di)溫(wen)回(hui)(hui)火脆(cui)(cui)性(xing)(xing)產生較(jiao)大(da)的影響(xiang)。鉻和(he)錳促進雜(za)質(zhi)元(yuan)素磷(lin)等在奧氏(shi)體(ti)晶(jing)界偏聚，從而促進低(di)(di)(di)溫(wen)回(hui)(hui)火脆(cui)(cui)性(xing)(xing)，鎢和(he)釩基本上(shang)沒有影響(xiang)，鉬降低(di)(di)(di)低(di)(di)(di)溫(wen)回(hui)(hui)火精(jing)拔無(wu)縫(feng)鋼(gang)管(guan)(guan)的韌(ren)性(xing)(xing)一脆(cui)(cui)性(xing)(xing)轉化溫(wen)度，但尚不(bu)足(zu)以抑制低(di)(di)(di)溫(wen)回(hui)(hui)火脆(cui)(cui)性(xing)(xing)。硅能推遲回(hui)(hui)火時(shi)滲碳體(ti)析出，提高其生成(cheng)溫(wen)度，故(gu)可提高精(jing)拔無(wu)縫(feng)鋼(gang)管(guan)(guan)低(di)(di)(di)溫(wen)回(hui)(hui)火脆(cui)(cui)性(xing)(xing)發生的溫(wen)度。