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(shi)近幾年出現(xian)的產品，主要是(shi)內孔、外(wai)壁尺(chi)寸有嚴格的公差及粗糙度。
精拔無縫(feng)鋼管(guan)是一種通過精拔或冷(leng)軋處(chu)理后的(de)一種高(gao)精密的(de)鋼管(guan)材料(liao)。由于精拔無縫(feng)鋼管(guan)內外壁無氧(yang)化層、承受高(gao)壓無泄漏、高(gao)精度、高(gao)光潔度、冷(leng)彎不變形、擴口、壓扁無裂縫(feng)等有(you)點(dian)，主要用來生產氣動或液壓 元(yuan)件的(de)產品，如(ru)氣缸(gang)或油缸(gang)，可以是無縫(feng)管(guan)，也有(you)焊接管(guan)。
特點
1.外徑更小。
2.精度高可做小批量(liang)生
3.冷拔成品精度高，表面質量(liang)好。
4.精拔無縫鋼管橫面積更復雜。
5.鋼管性能更優越，金屬(shu)比(bi)較密。
精(jing)拔無(wu)(wu)縫鋼管(guan)(guan)(guan)(guan)低(di)(di)(di)溫(wen)(wen)(wen)(wen)回(hui)(hui)(hui)火脆(cui)(cui)(cui)性(xing)(xing) 合(he)金鋼淬(cui)火得到(dao)馬氏體(ti)組織后(hou)，在(zai)(zai)250～400℃溫(wen)(wen)(wen)(wen)度范圍回(hui)(hui)(hui)火使鋼脆(cui)(cui)(cui)化(hua)(hua)，其韌性(xing)(xing)一脆(cui)(cui)(cui)性(xing)(xing)轉化(hua)(hua)溫(wen)(wen)(wen)(wen)度明顯升高。已脆(cui)(cui)(cui)化(hua)(hua)的精(jing)拔無(wu)(wu)縫鋼管(guan)(guan)(guan)(guan)不(bu)能再(zai)用低(di)(di)(di)溫(wen)(wen)(wen)(wen)回(hui)(hui)(hui)火加熱(re)的方法消除，故(gu)又稱為%26ldquo;不(bu)可逆回(hui)(hui)(hui)火脆(cui)(cui)(cui)性(xing)(xing)%26rdquo;。精(jing)拔無(wu)(wu)縫鋼管(guan)(guan)(guan)(guan)主要發生(sheng)(sheng)在(zai)(zai)合(he)金結構鋼和(he)低(di)(di)(di)合(he)金超高強度精(jing)拔無(wu)(wu)縫鋼管(guan)(guan)(guan)(guan)等(deng)鋼種(zhong)。已脆(cui)(cui)(cui)化(hua)(hua)精(jing)拔無(wu)(wu)縫鋼管(guan)(guan)(guan)(guan)的斷(duan)(duan)口是(shi)沿晶(jing)(jing)斷(duan)(duan)口或是(shi)沿晶(jing)(jing)和(he)準解理混合(he)斷(duan)(duan)口。產(chan)生(sheng)(sheng)低(di)(di)(di)溫(wen)(wen)(wen)(wen)回(hui)(hui)(hui)火脆(cui)(cui)(cui)性(xing)(xing)的原因，普遍認為：(1)與(yu)滲碳體(ti)在(zai)(zai)低(di)(di)(di)溫(wen)(wen)(wen)(wen)回(hui)(hui)(hui)火時以薄片狀(zhuang)在(zai)(zai)原奧(ao)氏體(ti)晶(jing)(jing)界(jie)析(xi)出，造(zao)(zao)成晶(jing)(jing)界(jie)脆(cui)(cui)(cui)化(hua)(hua)密(mi)切相關(guan)。(2)雜質元(yuan)素磷等(deng)在(zai)(zai)原奧(ao)氏體(ti)晶(jing)(jing)界(jie)偏聚也(ye)是(shi)造(zao)(zao)成低(di)(di)(di)溫(wen)(wen)(wen)(wen)回(hui)(hui)(hui)火脆(cui)(cui)(cui)性(xing)(xing)原因之(zhi)一。含磷低(di)(di)(di)于0.005%的高純度精(jing)拔無(wu)(wu)縫鋼管(guan)(guan)(guan)(guan)并不(bu)產(chan)生(sheng)(sheng)低(di)(di)(di)溫(wen)(wen)(wen)(wen)回(hui)(hui)(hui)火脆(cui)(cui)(cui)性(xing)(xing)。磷在(zai)(zai)火加熱(re)時發生(sheng)(sheng)奧(ao)氏體(ti)晶(jing)(jing)界(jie)偏聚，淬(cui)火后(hou)保留下來。磷在(zai)(zai)原奧(ao)氏體(ti)晶(jing)(jing)界(jie)偏聚和(he)滲碳體(ti)回(hui)(hui)(hui)火時在(zai)(zai)原奧(ao)氏體(ti)晶(jing)(jing)界(jie)析(xi)出，這兩個因素造(zao)(zao)成沿晶(jing)(jing)脆(cui)(cui)(cui)斷(duan)(duan)，促(cu)成了精(jing)拔無(wu)(wu)縫鋼管(guan)(guan)(guan)(guan)低(di)(di)(di)溫(wen)(wen)(wen)(wen)回(hui)(hui)(hui)火脆(cui)(cui)(cui)性(xing)(xing)的發生(sheng)(sheng)。
精拔(ba)無縫鋼管中合金元(yuan)素(su)對低(di)溫回(hui)(hui)火脆(cui)性(xing)產生(sheng)較大的(de)影響。鉻和(he)錳促進雜(za)質元(yuan)素(su)磷(lin)等(deng)在奧(ao)氏體(ti)(ti)晶界偏(pian)聚，從而促進低(di)溫回(hui)(hui)火脆(cui)性(xing)，鎢和(he)釩基本(ben)上沒有影響，鉬降低(di)低(di)溫回(hui)(hui)火精拔(ba)無縫鋼管的(de)韌性(xing)一(yi)脆(cui)性(xing)轉化溫度(du)(du)，但尚(shang)不足以抑制低(di)溫回(hui)(hui)火脆(cui)性(xing)。硅能推遲回(hui)(hui)火時滲碳(tan)體(ti)(ti)析出，提高(gao)其生(sheng)成溫度(du)(du)，故(gu)可提高(gao)精拔(ba)無縫鋼管低(di)溫回(hui)(hui)火脆(cui)性(xing)發生(sheng)的(de)溫度(du)(du)。
