钛(tai)合金无缝管的(de)特点：

钛合(he)(he)金与(yu)其他金属(shu)材料相比(bi),有(you)(you)下列优点:①比(bi)强(qiang)(qiang)(qiang)度(du)(du)(du)(du)(抗拉强(qiang)(qiang)(qiang)度(du)(du)(du)(du)/密度(du)(du)(du)(du))高(见图),抗拉强(qiang)(qiang)(qiang)度(du)(du)(du)(du)可达100～140kgf/mm2，而(er)密度(du)(du)(du)(du)仅为钢的(de)60%。②中(zhong)(zhong)温强(qiang)(qiang)(qiang)度(du)(du)(du)(du)好,使(shi)用温度(du)(du)(du)(du)比(bi)铝合(he)(he)金高几百度(du)(du)(du)(du)，在(zai)中(zhong)(zhong)等温度(du)(du)(du)(du)下仍能保持(chi)(chi)所要求的(de)强(qiang)(qiang)(qiang)度(du)(du)(du)(du),可在(zai)450～500℃的(de)温度(du)(du)(du)(du)下长期工作。③耐(nai)蚀(shi)性(xing)(xing)好,在(zai)大气中(zhong)(zhong)钛表面(mian)立(li)即(ji)形成一层均匀致密的(de)氧(yang)化膜，有(you)(you)抵抗多种介质侵蚀(shi)的(de)能力。通常钛在(zai)氧(yang)化性(xing)(xing)和中(zhong)(zhong)性(xing)(xing)介质中(zhong)(zhong)具有(you)(you)良(liang)好的(de)耐(nai)蚀(shi)性(xing)(xing)，在(zai)海水、湿氯(lv)气和氯(lv)化物(wu)溶液中(zhong)(zhong)的(de)耐(nai)蚀(shi)性(xing)(xing)能更为优异。但在(zai)还原性(xing)(xing)介质，如盐(yan)酸等溶液中(zhong)(zhong)，钛的(de)耐(nai)蚀(shi)性(xing)(xing)能较差。④低温性(xing)(xing)能好,间(jian)隙(xi)元素极低的(de)钛合(he)(he)金,如TA7,在(zai)-253℃下还能保持(chi)(chi)一定的(de)塑性(xing)(xing)。⑤弹性(xing)(xing)模量(liang)低,热导率小，无铁磁性(xing)(xing)。

钛无缝管