socket welded long radius elbow 1. Material: 304, 304L, 321, 316, ... , HG, DIN, JIS, GB socket welded long radius elbow Socket welded elbows is a type of socket welded ... direction in piping and are also sometimes called a quarter bend.1. Material: 304, 304L, 321, 316, ... The B16.11 standard covers pressure-temperature ratings, dimensions, tolerances, marking, and material requirements for forged carbon ...