5. High pressure chemical fertilizer equipment, stainless steel seamless pipe (GB6479-2000) is applicable to operating temperature -40 ~ 400 ℃, working pressure of 10 ~ 30Ma of chemical equipment and pipeline quality carbon structural steel and alloy steel seamless pipe .

6. Petroleum cracking of stainless steel seamless pipe (GB9948-88) is applicable to the oil refinery furnace tubes, heat exchangers and pipe seamless steel pipe.

7. geological drilling steel (YB235-70) is the core drilling for geological department of the steel used by applications can be divided into the drill pipe, drill collars, cores, sleeves and precipitation tubes.

8. Diamond core drilling seamless pipe (GB3423-82) is used for diamond core drilling drill, core rods, seamless steel pipe casing.