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鈦(tai)(tai)的(de)(de)一(yi)般特(te)征為(wei)(wei)(wei)(wei):銀(yin)白(bai)色(se),密(mi)度(du)為(wei)(wei)(wei)(wei)4.5g/cm3,熔點高(gao)(gao)(gao)達1677度(du)(比鋼高(gao)(gao)(gao)),有同素異構轉變,在(zai)(zai)825度(du)以下為(wei)(wei)(wei)(wei)密(mi)排六方(fang)晶格,稱a鈦(tai)(tai)。在(zai)(zai)882度(du)以上(shang)為(wei)(wei)(wei)(wei)體心立方(fang)晶格,稱為(wei)(wei)(wei)(wei)B鈦(tai)(tai)。其性(xing)(xing)能特(te)點:(1)密(mi)度(du)小,強(qiang)度(du)高(gao)(gao)(gao),塑性(xing)(xing)好(hao),退(tui)火狀態(tai)下抗拉(la)強(qiang)度(du)為(wei)(wei)(wei)(wei)3500-7000MPa,延(yan)伸率15-40%,比強(qiang)度(du)比目(mu)前(qian)任(ren)何材料都大。(2)抗腐蝕(shi)性(xing)(xing)能強(qiang),在(zai)(zai)大多數介質(zhi)中(zhong)(zhong)耐蝕(shi)性(xing)(xing)能都好(hao),特(te)別(bie)是對中(zhong)(zhong)性(xing)(xing),氧化性(xing)(xing)和海水中(zhong)(zhong)有高(gao)(gao)(gao)的(de)(de)耐蝕(shi)性(xing)(xing)。在(zai)(zai)海水中(zhong)(zhong)比鉻、鎳不銹(xiu)鋼和鋁(lv)都強(qiang)。但氫(qing)氟酸、硫酸、鹽酸、正(zheng)磷酸對鈦(tai)(tai)有一(yi)定的(de)(de)腐蝕(shi)作用。(3)鈦(tai)(tai)的(de)(de)性(xing)(xing)能與其純度(du)有很大的(de)(de)關系,微量的(de)(de)雜質(zhi)能使鈦(tai)(tai)的(de)(de)強(qiang)度(du)增加,塑性(xing)(xing)降低,工業純鈦(tai)(tai)的(de)(de)含鈦(tai)(tai)量為(wei)(wei)(wei)(wei)99.5%。(4)鈦(tai)(tai)的(de)(de)焊接性(xing)(xing)能差(cha),因(yin)為(wei)(wei)(wei)(wei)它是活潑金(jin)屬,易(yi)吸收空氣中(zhong)(zhong)的(de)(de)有害雜質(zhi),因(yin)此要保護(hu)可靠。