Stainless Steel J Type Wrap On Wound L Finned Tubes ASTM A269 TP304L With AL1100 Fins Chemical Composition (%) max Grade C Mn P S Si Cr Ni TP304L 0.035 2.00 0.045 0.030 1.00 18.0-20.0 8.0-13.0 Mechanical Properties Grade Tensile Strength min Yield Strength min Elongation in 2" or 50mm min TP304L 70ksi (485 MPa) 25ksi (170 MPa) 35% ASTM A269 covers seamless and welded austenitic stainless tubing for general corrosion-resistant & temperature service, which is ideal as fin tube