Composite reinforced producing method for high strength steel

Abstract

The production process of compositely reinforced steel includes the steps of smelting, tapping, deoxygenating and alloying, blowing argon, continuous casting, finishing, heating, rolling, cooling, etc. The production process features smelting in oxygen converter with final carbon content controlled in 0.08-0.12 %, controlling the chemical components of the steel product, deoxygenating and alloying via adding SiMnFe, MnFe, SiFe, SiAlCaBa and NbFe, bottom blowing argon in the ladle, continuous casting at 1020-1060 deg.c, and rolling in the austenite re-crystallization region. The steel bar product of the present invention has high toughness, good weldability, good earthquake resistant performance, high strength, low cost and high comprehensive performance.

Description

technical field

[0001] The invention belongs to the technical field of smelting, and in particular relates to a composite strengthening production method of high-strength steel. Background technique

[0002] The high-strength steel series is established by strengthening and grading of C, Mn and Si. Due to pearlite, the C-dominated strengthening mechanism series of high-strength steels (including hot-rolled and cold-rolled) have serious imbalance of strength and ductility due to the development of strength, mainly manifested as low toughness index and poor resistance to strain aging. , followed by the process performance of the construction site: poor welding, cold bending, straightening and other performance. The third is the poor ductility of cold-worked steel bars. The above-mentioned quality problems are manifested in the mismatch between strength and ductility in various high-strength steels, strong notch sensitivity, poor strain aging resistance, large work hardening ...