Product Name weld neck; so ; blind flange, socket flange Material ASTM A105 A216 A352 A352 WC6 ASTM A217 WC9 ASTM A217 ASTM A351 A182 Size Size 1/4" to 48" Outside Diameter 13.7 mm to 1219 mm Standard ANSI B16.5 B16.47 ASME B16.5 B16.36 BS4504-3.1 DIN2503 2527 2627 2629 2630-2638 DIN2573 DIN2576 DIN2501 DIN2566 DIN2656 JIS B2220 JIS 5K,10K,16K,20K 2638 2573 2576 2501 2566 2656 JIS B2220 JIS 5K,10K,16K,20K Certificates API5L, ISO 9001:2008,SGS, BV,CCIC Wall thickness class 150; class 300; class 600; class 900, PN Surface Treatment black paint, varnish, oil, galvanized, anti corrosion coatings Marking Standard marking, or according to your request. Marking Method: Spray white paint Connect way Welded Packaging wooden case & pallet Test Chemical Component Analysis, Mechanical Properties, Technical Properties, Exterior Size Inspection, hydraulic testing , X-ray Test. Application liquid delivery; Structure pipe; High and low pressure Boiler tube; Seamless steel tubes for petroleum cracking; oil pipe; gas pipe. Advantages 1.Reasonable price with excellent quality 2.Abundant stock and prompt delivery 3.Rich supply and export experience, sincere service.