The invention discloses a nickel-free economic low-temperature steel suitable for minus 100 DEG C. The microstructure is a ferrite and a pearlite. The nickel-free economic low-temperature steel suitable for the minus 100 DEG C comprises the following chemical elements of, by mass, greater than 0 and less than or equal to 0.18% of C, 0.15-0.4% of Si, 0.3-0.95% of Mn, 0.15-0.55% of Cr, 0.1-0.4% of Cu, 0.005-0.06% of Ti and the balance Fe and other inevitable impurities, wherein the valve of Ti/Cu is greater than or equal to 0.05. In addition, the invention further discloses a steel plate and a steel pipe made of the nickel-free economic low-temperature steel and manufacturing methods of the steel plate and the steel pipe. According to the nickel-free economic low-temperature steel, under thecontion that the element Ni is not added, the content of the Mn is controlled within a certain range, and no Al element is added, so that the low-temperature performance of the steel is realized under the condition that the elements of the Cu and the Ti are reasonably proportioned.