9%~12%Cr马氏体钢中厚壁管焊接接头的超声波探伤
9%~12%Cr마씨체강중후벽관한접접두적초성파탐상
Ultrasonic Inspection of Welded Joints in the Medium-Sized Heavy-Wall Pipes of 9%-12% Cr Martensitic Steel
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