Company News

• 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
• 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
• The 21th Iran oil show is started in Tehran2016-05-06