A method for manufacturing steel, by quenching and tempering a seamless pipe for use as a material of a hollow spring, where the seamless pipe including predetermined components is subjected to a heat treatment which is performed to satisfy quenching conditions (1) and tempering conditions (2), (1) quenching conditions: 26,000≤(T1+273)×(log(t1)+20)≤29,000 900° C.≤T1≤1,050° C., 10 seconds≤t1≤1,800 seconds,  formula (1) where T1 is a quenching temperature (° C.), and t1 is a holding time (seconds) in a temperature range of 900° C. or higher, and (2) tempering conditions: 13,000≤(T2+273)×(log(t2)+20)≤15,500 T2≤550° C., and t2≤3,600 seconds,  formula (2) where T2 is a tempering temperature (° C.), and t2 is a total time (seconds) from start of heating to completion of cooling.