The common way of designing the section of steel-structure axle-center pressed structural member is trying means or gradual approaching means.
一般钢结构的轴心受压构件，其截面设计都采用试凑法或逐次逼近法。
2
The commonstructural defect of large-scale rudder horn casting steel and its cause of flaw were analyzed, the smelting and heat treatment technology of casting steel was pointed out as well.