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  Delivery of GOST 33259 weld neck flanges with RTJ and RF sealing faces

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  Delivery of Q235B flat flanges to Australia

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  ASME B16.5 RTJ A182 F22 CL.1 blind flanges delivered to Singapore

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  ASME B16.5 A105N hot-galvanized reducing thread flanges ready for UAE shipment

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  How to minimize bending and wave-like deformation in overlay welding of slender shafts and large thin-walled cylinders

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  ASTM A182 F51 S31803 JIS B2220 10K RF blind flanges delivered to Singapore

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  The purpose and procedure of the red lead test for octagonal gaskets and high-pressure flanges

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  Applications and techniques of overlay welding for different materials and operational requirements

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  Delivering LDPE flange covers for enhanced pipe protection

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  Strict quality inspection of S235JR DIN flanges

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  Introduction to DIN 2502 S235JR PN16 PL Flange

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  The difference between threaded flanges and weld neck flanges

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  What is reducing threaded flanges？

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  Introduction to basic type wound metal and non-metal strips of spiral wound gaskets

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  How to choose the inner ring of spiral wound gasket and the material of spiral wound metal belt？

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  Haihao Group welcomes you to visit us at ADIPEC in Abu Dhabi

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  The difference between RF and RTJ sealing faces

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  Methods for preventing and controlling heat treatment deformation

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  Factors influencing heat treatment deformation

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  Haihao Group’s commitment to meeting urgent customer flange needs

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  Hot dip galvanizing process and benefits of flange

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  Introduction to swivel flanges: Haihao Group’s expertise in offshore engineering

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  Material requirements for ASTM A694 GR. F65 compact flange

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  Introduction to new expansion techniques for heat exchanger tubes and tube sheets