A516Gr70 is American standard low temperature pressure vessel steel plate. The tensile strength is greater than 482MPa. The main element content is C Mn Si, and the control of p and s determines its performance.
4140 steel is an alloy structural steel with high strength, hardenability, good toughness, and small deformation during quenching.
4130 structural steel has high strength and toughness, high hardenability, and is usually used in quenched and tempered state.