... tube socket weld elbow 1. Material: 304, 304L, 321, 316, 316L, etc. 2. Standard: ASME, MSS, HG, DIN, JIS, GB tube ... called a quarter bend.1. Material: 304, 304L, 321, 316, 316L, etc.2. Standard: ASME, MSS, HG ... Elbow1. Size: 1/8"-4"; DN6-DN1002. Pressure: 3000#, 6000#, 9000#3. Standard: GB/T14383-2008SH ... with ASME B16.11. The B16.11 standard covers pressure-temperature ratings, dimensions, tolerances, ...