API 5L steel pipes come in grades B through X80, with some manufacturers up to X120. Pipes can be delivered as-rolled, normalizing rolled, or various thermomechanical processes. Grade descriptions use letter L followed by minimum yield strength or X followed by strength value
Pipe sleeve is a protective cover for inner pipes. Allows lower-size pipes to run through. Can be made from various materials including steel, PVC, rubber
Drill collar is a thick-walled steel tube with threaded connections. Manufactured from chrome-molybdenum alloy 4140 with Brinell hardness 255-341. Available in lengths 2: 9.15-9.76m and 3: 12.8-13.27m
Standardizes dimensions and materials of welded and seamless wrought steel pipe. Uses nominal pipe size (NPS) designator for identification. Covers high and low temperature/pressure applications
Maximum straight line deviation is 1mm on 1000mm gauge length. Tubes supplied with clean square cut ends. Available in black and bare or varnished finishes. Bundled in hexagonal format with steel straps
Ulsan Works produces 700,000 tonnage of steel products annually. Founded in 1978, leading domestic steel pipe mill. Acquired ISO 9001/14001 certification for quality management