The invention relates to a low-cost cold-rolled low-
alloy high-strength steel production method which comprises the following process steps: S1, hot coiling: adopting the process flows of molten iron pretreatment, 150t top-bottom combined blown converter, LF furnace and
continuous casting to produce a qualified plate blank; s2, acid rolling is conducted,
oxide scales on the hot-rolled surface are removed through a reasonable acid
pickling technology, sufficient deformation
distortion energy during annealing is provided through a proper acid rolling
reduction rate, and power is provided for sufficient recrystallization; s3,
continuous annealing and
galvanization: strictly checking the surface
reflectivity before annealing and annealing, ensuring the surface cleanliness, ensuring the surface quality of a final product, heating the cold hard coil to be above the recrystallization temperature through a
continuous annealing furnace, ensuring the
mechanical property of the final product, completing the annealing and cooling processes through the
continuous annealing furnace for continuous annealing and
galvanization, and performing continuous annealing and
galvanization through an oiling
machine. And uniformly
coating the surface of the steel plate with anti-
rust oil, and generating a final finished product through a coiling
machine. The comprehensive tensile property and the surface quality of the cold-rolled low-
alloy high-strength steel are guaranteed.