ANSI WELDING NECK FLANGE 1-standards:ASTM,BN API,etc 2-material:carbon steel, alloy steel,etc 3-a large stock -a ... big manufacturer of steel pipe and pipe fitttingsKey Specifications/Special Features:1>Types: welding neck, slip-on, threaded, ... China.The main products include: seamless steel pipe, straight seam steel pipe, spiral steel pipe, welded steel pipe, elbow, tri -elbow, different ...