1. National standard marking:Flanges shall be marked according to nominal diameter, nominal pressure, sealing surface form code, mating steel pipe series code (mating metric pipe code is "series 2", mating inch pipe is not marked) and standard number. Marking example: Nominal diameter 80mm, nominal

Difference & Introduction

1. Stainless steel is extensively used in construction, tranconstruction, chemical industry, energy, packaging, household appliances and petroleum industry.Most steel can be used in construction industry and sustainable steel structures can meet the needs of various infrastructure projects. With exc