A series of advanced and suitable techniques were adopted in the design of 1750m3 BF in Jigang, such as entire cooling staves structure, thin skinned lining, copper cooling staves, carbon brick-ceramic cup complex bottom, closed loop soft water cooling system, PW serial type bell-less top with two coaxial vertical hoppers, KALUGIN top-combustion stove, etc.

7 blast furnace o Benxi Steel,such as entire cooling staves structure,thin skinned lining,copper cooling staves,UCAR carbon brick cerami(?) cup complex bottom,closed loop soft water cooling system,PW serial type bell less top with two coaxial vertical hoppers Hoogovens top-combustion stove,etc.

20CrMo steel thin bushings to be heat - treated with two different procedures of gas nitrocarburizing and salt bath nitrocarburizing, then to compare the deformation of the bushings and the performance of the nitrocarburizing layer, and find out the effective factors for the deformation.

3 BF,some measures adopted during smelting totally with coke at the initial stage of starting-up and operation practices adjusting at the top and bottom after starting-up,draws temperature standard for copper cooling stave zone,points out retaining suitable coal gas flow at the edge and temperature at middle limitation are the keys to strengthen smelting for BF with thin furnace lining.

In order to reaching the aim of long campaign,imported ceramic cups are used for furnace bot- tom and hearth while thin furnace lining and copper cooling stave are adopted at bosh,belly and lower part of stack.