Abstract: The present invention discloses a hot-rolled strip steel and manufacturing method therefor. The hot-rolled strip steel comprises the following components in mass percentage: C: 0.04-0.09%, Si?0.50%, Mn: 0.10-1.50%, P?0.03%, S?0.01%, Al?0.60%, Cr: 1.5-4.5%, Cu: 0.10-0.60%, Ti: 0.05-0.18%, Ni?0.30%, Nb?0.06%, N?0.008%, and the balance being Fe and inevitable impurities, and the hot-rolled strip steel further satisfies: 2Mn+Cr?6%, with element symbols being substituted with mass percentages of corresponding chemical elements in the hot-rolled strip steel for calculation. The present invention shows excellent resistance to atmospheric corrosion and mechanical properties.

Abstract: The present invention provides a hot-rolled strip steel and manufacturing method therefor. The hot-rolled strip steel comprises the following components in mass percentage: C: 0.04 to 0.15%, Si?0.50%, Mn: 0.30 to 2.00%, Cr: 1.5 to 4.5%, Cu: 0.10 to 0.60%, P?0.03%, S?0.01%, and Al: 0.01 to 0.60%, with the balance being Fe and unavoidable impurities; and further satisfies: 2.5%?2Mn+Cr?6.0%, with elemental symbols being substituted with mass percentages of corresponding elements in the hot-rolled strip steel for calculation. The hot-rolled strip steel of the present invention exhibits excellent resistance to atmospheric corrosion and mechanical properties, and can be directly used for supporting bracket structural parts such as guardrails, mast towers and photovoltaics without coating on the surface.