The invention discloses a 400 MPa-level Cl environment
corrosion resistant
steel bar and a manufacturing method thereof and belongs to the technical field of
corrosion resistant steel for building. The chemical components of the
steel bar comprise, by weight, 0.08-0.12% of C, 0.40-0.70% of Si, 1.00-1.30% of Mn, 1.00-1.30% of Cr, smaller than or equal to 0.20% of Ni, 0.20-0.40% of Cu, 0.10-0.20% ofMo, 0.04-0.07% of V, 0.02-0.04% of Nb, smaller than or equal to 0.035% of P, smaller than or equal to 0.010% of S, and the balance Fe and inevitable remaining
impurity elements. According to the method, by means of the synergistic effect of the
alloy elements,
corrosion resistant performance of the
steel bar is improved, and different reinforcing mechanisms of the
alloy elements are utilized forcarrying out the comprehensive strengthening and
toughening design. According to the manufacturing method of the steel bar,
smelting and pouring are carried out by the book, and then the controlled rolling and controlled cooling technology is adopted on a bar mill. The content of
precious metal elements in the steel bar is small, the comprehensive performance of the steel bar is excellent, resources are saved, and the production cost is low.