WELDING NECK FLANGE ASME 150-900LB ASTM STEEL STAINLESS HIGH NECK

1：	Welding neck flanges are the type that is joined to piping by butt welding end of the long neck, thickness transition along which gives it reinforcement under higher stress.
2：	Stock finish, spiral serration (or phonographic), concentric serration and smooth surface.
3：	Carbon steel and stainless steel
4：	ASME B16.5

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