Steel for economical hot-rolled U-shaped sheet pile and production method

The invention relates to economical hot-rolled steel for a U-shaped sheet pile. The economical hot-rolled steel comprises the following components in percentage by weight: 0.24-0.30% of C, 0.20-0.30% of Si, 0.8-1.30% of Mn, 0.007-0.011% of Nb, less than or equal to 0.035% of P, less than or equal to 0.035% of S, less than or equal to 0.035% of P, less than or equal to 0.035 The production method comprises the following steps: casting after converter smelting; heating the casting blank; descaling with high-pressure water; performing two-stage hot rolling; and conventionally carrying out post-procedures. The tensile strength is not lower than 630 MPa, the ferrite grain size is not lower than 8 grade, the use frequency is not lower than 15 times, molten iron desulfurization is not needed, electromagnetic stirring is not needed during pouring, and the production cost can be relatively reduced by at least 10%. 一种经济性热轧U型板桩用钢，其组分及wt%含量为：C：0.24～0.30%、Si：0.20～0.30%、Mn：0.8～1.30%、Nb：0.007～0.011%、P≤0.035%、S≤0.035%；生产方法：转