软中碳结构钢
soft medium structural steel
碳结构钢用电焊条
electric welding rod for carbon construction steel
中碳结构钢
medium carbon structure steel
medium carbon structural steel
medium-carbon structure steel
medium carbon constructional steel
钢结构构件拓扑优化
steel structure topology optimization
箱筒型钢结构构件
box steel structure components
原型结构构构成法
the formation of the fashion prototype
Q345C含Nb低碳钢
Bearing Nb Low Carbon Steel Q345C
Q345低合金高强度结构钢
Q345 HSLA structural steel
SPHD低碳低硅钢
SPHD low carbon and low silicon steel