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  Looking back at 2022, gathering strength, looking forward to 2023, forge ahead！

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  Delivery of large diameter flanges to Singapore customers

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  The main hull of the first ultra deep water scientific research drilling ship is connected

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  Participate the SSGC tender of pipe fittings & flanges

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  Customer orders tube sheet flange

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  PetroChina was rated as one of the top ten outstanding cases of Chinese brands going to sea

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  2022 China Marine Economy Expo opens in Shenzhen

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  Haihao Group Brings Pipeline Products to the 2022 China Marine Economy Expo

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  Classification of alloy flanges

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  Haihao Group was invited to attend the 2022 SSNAME Academic Conference

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  Differences between flat welding flange and butt welding flange

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  Send flange samples to American customers

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  Haihao Group will attend the 2022 China Marine Economic Expo in November

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  Plant upgrading in progress

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  Why do flanges need heat treatment?

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  Common types of stainless flanges

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  Relevant knowledge of flange gasket

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  Flange welding skills

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  What is a large diameter flange?

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  Application difference of flanges under petrochemical standard classification

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  Classification of flanges

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  What causes flange leakage

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  Large flange for wind power generation

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  Introduction of anchor flange