The purpose of prebending process of longitudinal submerged arc welding pipe production line is introduced;character of roller prebending and mould press type prebending is analyzed.
The article describes the setting-up and optimalization of the process parameters for the twohigh rotary pipe sizer employed by the 170 Seamless Steel Tube Plant,Daye Special Steel Corp.Ltd.
TPCO Iron-making Subsidiary adopts a stoppage method of dropping the stock level with vacant stockline to expose the staves inside the blast furnace in order to replace the damaged ones.
Please unload a part of the weldless steel tubes in Hatch No.3 hatchway for the present so as to the stevedores can use the opening to fill in the lower hold.