The blind flanges complying with ASME B16.5 standard manufactured by Hebei Hexin Pipe Fitting Co., Ltd. are 2-1/2 inches in size, Class 300 in pressure rating, and made of A105 carbon steel. The products adopt A105 forged steel billets, which are forged to form a compact structure and then subjected to heat treatment such as normalizing. Afterwards, precision machining on end faces, outer circles and thickness is conducted with large vertical lathes or CNC lathes to ensure smooth and flat sealing surfaces. Blind flanges are used to seal the ends of pipelines or vessels, and are widely applied to pressure testing, maintenance and terminal sealing of pipeline systems in industries including petroleum, chemical engineering, natural gas and electric power. The applicable temperature range of A105 material is approximately from -29°C to +425°C. Under normal temperature (-20°F to 100°F), the maximum non-impact working pressure of Class 300 pressure rating is 740 PSIG (about 5.10 MPa). Hebei Hexin Pipe Fitting boasts the advantage of producing blind flanges in various pressure ratings and sizes. It features particularly strong processing capacity for thick-walled blind flanges. Its products are free from defects such as sand holes and cracks, with high-precision sealing surfaces and reliable pressure-bearing performance. The company’s production specifications cover all sizes (1/2" to 24") and pressure ratings (Class 150 to Class 2500) of blind flanges under the ASME B16.5 standard, with materials including various carbon steels, stainless steels and alloy steels such as A105, A182 F304/316 and A350 LF2.
