Abstract: The requirements of mechanical properties of A537CL2 steel products for LPG storage tanks are very high.A537CL2 test steel was hot-rolled to different thicknesses（16 mm, 30 mm and 33 mm）. After that, quenching and tempering tests were carried out, and its microstructure and properties were comprehensively analyzed. The results show that the content of S, P harmful elements in test steel are controlled with high quality and stability, and the contents are S ≤0.0008%, P ≤0.01%. The experimental steel is quenched at（890 ±10）℃ and tempered at the temperature range of 620-680 ℃. It has excellent and stable mechanical properties, the yield strength≥465 MPa, the tensile strength≥585 MPa, the elongation A₅₀≥27%, and lateral impact energy at-50 ℃ ≥207 J. The microstructure of the quenched and tempered experimental steel is bainite and a small amount of ferrite. The impact fracture morphology is ductile fracture. The generated small bainite lath bundles are the main source of high strength and toughness.