differences between N-80 and L-80 Casing Pipe

astm a335 alloy-steel-pipes
ASTM A335 alloy seamless steel pipe Gr. P22, 3 inch SCH 120
November 3, 2016
API 5DP drill pipes
API 5DP drill pipe, Grade E75, OD 127mm , wall thickness 12.7mm
November 10, 2016