180 degree carbon elbow size:1/2"----64" material: carbon steel ,plastic ,alloy steel or as your requirement 180 degree carbon elbowsize :1/2 ... steel ,plastic,alloy steel or as your requirementstandard :DIN ,SMS ,ASTM ,ISO ,GB ,sch10s,sch20 ,sch30, sch40,sch60, sch80, sch100, sch120 ... in the gas ,water ,agriculture,boiler ,construction, and other field 180 degree carbon elbow