">

国产在线高清视频_日韩精品无码视频专区免费_欧美另类癖好手机在线网_日韩AⅤ无码视频_成人AV无码专区亚洲AV_最新国产精品拍自在线播放_老司机美女一级毛片_妞干网手机免费视频_女性下面全部视频免费_国产一区二区人大臿蕉香蕉


子欄目
無縫方管的各種材質
2020年05月08日

無縫方管的各種材質 Q345A:C≤0.20,Mn ≤1.70,Si≤0.50,P≤0.035,S≤0.035;Q345B:C≤0.20,Mn ≤1.70,Si≤0.50,P≤0.035,S≤0.035;Q345C:C≤0.20,Mn ≤1.70,Si≤0.50,P≤0.030,S≤0.030,Al≥0.015;Q345D:C≤0.18,Mn ≤1.70,Si≤0.50,P≤0.030,S≤0.025,Al≥0.015;Q345E:C≤0.18,Mn ≤1.70,Si≤0.50,P≤0.025,S≤0.020,Al≥0.015;Q345A、B、C、D、E均含Nb≤0.07,V≤0.15,Ti≤0.20,Cr≤0.30,N≤0.012,Mo≤0.10。20#、Q235B

?