外径≤10厘米的管状铝合金(在293K(20摄氏度)时的极限抗拉强度能达到460兆帕(0.46×109牛顿／平方米)或更大)

Tubes and pipes of aluminum alloy, of an outside diameter not exceeding 10cm,tensile strength reaches 460 mega-P (0.46*109Newton/ m2) or more at 293K (20 degree centigrade)