Steel for X100 pipeline and production method thereof

The invention relates to steel for an X100 pipeline. The steel for the X100 pipeline comprises the following components in percentage by weight: 0.035-0.065% of C, 0.15-0.40% of Si, 1.90-2.30% of Mn, not more than 0.012% of P, not more than 0.015% of S, 0.030-0.060% of Nb, 0.030-0.055% of V, 0.010-0.025% of Ti, 0.15-0.35% of Cu, 0.30-0.60% of Cr, 0.15-0.30% of Ni, 0.020%-0.050% of Al, 0.0008-0.025% of B and not more than 0.0080% of N, wherein Ni/Cu is not less than 0.5. The steps are as follows: smelting, and performing continuous casting to form a blank; heating the cast blank; performing rough rolling; performing finish rolling; rapidly cooling; and straightening. The steel for the X100 pipeline, disclosed by the invention, adopts the component design of no Mo, low Nb and low Ni and a simpler process, and can not only significantly reduce the production cost, but also avoid the adoption of complex process steps of air cooling, relaxation, three-stage rolling and the like, a bainite and a small dispersed distribution of M-A tissues can be further obtained, and a steel plate made of the steel can realize RP0.2 of not less than 690MPa, Rm of not less than 760MPa, RP0.2/Rm of not more than 0.90, elongation rate of not less than 24%, -20 DEG C KV2 of not less than 230J, and -15 DEG C DWTTSA of not less than 85%.