HK-40 centrifugal cast furnace pipe (Chinese trademark is 4Cr25Ni20) has been widely applied in oil refining and petrochemical units, but its welding is a difficult point in petrochemical project construction.

• HK -4 0离心浇铸炉管 (我国牌号为 4Cr2 5Ni2 0 )已经广泛用于炼油和石化装置中 ,该炉管的焊接是石化工程施工中的一个难点。