News
- Spectacle blind flanges,ring spacers and paddle flanges are finished in Hebei Haihao2016-09-26
- Hebei Haihao Group finished supplement flange order2016-09-23
- Technical specification of spectacle blind flange2016-09-19
- How to use a spectacle blind flange?2016-09-18
- Types of spectacle flanges2016-09-14
- The meaning and type of steel pipes2016-09-05
- The advantage of pipe grooved ends joints2016-09-05
- The usage of pipe grooved ends joints2016-09-02
- What is a bevel end?2016-08-25
- Hot induction factory bends under sand blasting in Hebei Haihao2016-08-24
- Pipe and fitting ends in piping system joint2016-08-23
- The pipe end type of steel pipe and pipe fittings2016-08-17
- The tolerance of butt welding pipe fittings2016-08-11
- The advantage and the application of butt welding pipe fittings2016-08-09
- What’s butt welding pipe fittings?2016-08-05
- Application and advantage of weld neck flange2016-07-21
- What is weld neck flange?2016-07-21
- What is butt welding?2016-06-23
- Haihao showed piping products in 21th Iran Oil & Gas show2016-06-22
- Haihao steel piping exporting department finish order production for Dubai client2016-06-14