cast boundary croppage(Steel grade separator plates are inserted in the mold to minimize the amount of steel mixing and reduce the cast boundary croppage. 将钢种隔离板插人结晶器，以便将混钢量减少到最低，同时减少接浇处切头量。)
socket(① Sockets shall have parallel threads unless otherwise specified. 除非另有规定，管接头应具有直螺纹。② The sockets shall be manufactured either from steel similar to that of the tubes or from wrought iron. 管接头应使用与钢管相似的钢或熟铁制造。)
