Economical high-strength steel with good formability based on csp production line and manufacturing method thereof

Abstract

The invention discloses CSP production line-based economic high-strength steel with good forming property and a production method thereof. The CSP production line-based economic high-strength steel with good forming property comprises the following chemical ingredients in percent by weight: 0.04-0.07% of C, 0.10-0.30% of Si, 1.20-1.50% of Mn, less than or equal to 0.015% of P, less than or equal to 0.004% of S, 0.13-0.18% of Ti, 0.02-0.04% of Als, less than or equal to 0.004% of N, less than or equal to 0.002% of O, and the balance of Fe and inevitable impurity elements. The production method of the CSP production line-based economic high-strength steel with good forming property comprises the following steps: smelting molten steel, casting a steel billet, heating a plate billet, carrying out hot continuous rolling, carrying out laminar cooling, and reeling, wherein heating temperature is 1200-1240 DEG C, initial rolling temperature is 1130-1160 DEG C, final rolling temperature is 820-860 DEG C, and reeling temperature is 600-640 DEG C. The CSP production line-based economic high-strength steel with good forming property has high strength, good forming property and low cost, a preparation method and technology are simple, and energy consumption is low.

Description

technical field [0001] The invention relates to the technical field of manufacturing a CSP production line and Ti-containing high-strength steel, and specifically refers to an economical high-strength steel with good formability based on a CSP production line and a manufacturing method thereof. Background technique [0002] CSP production line has been favored by iron and steel enterprises in various countries in recent years because of its short process, low energy consumption, low investment and high production efficiency, especially in the production of thin materials. At the same time, with the increasing awareness of energy saving and emission reduction, the application range of high-strength steel is becoming wider and wider, and the thickness specifications are getting thinner and thinner. Thin-gauge high-strength steel with a thickness specification of 2.0-4.0 mm and a tensile strength ≥700 MPa is produced in a hot continuous rolling production line, the rolling load...

AI Technical Summary

Problems solved by technology

Thin-gauge high-strength steel with a thickness specification of 2.0-4.0 mm and a tensile strength ≥700 MPa is produced in a hot continuous rolling production line, the rolling load is large, the plate shape control ability is poor, and the production efficiency is low, but the production in the CSP production line is not good. These problems exist, so in recent years, there have been many studies on the production of high-strength steel by CSP production lines

However, the thickness specification high-strength steel produced by the CSP production line of the above invention generally has the phenomenon of cold forming cracking caused by mixed crystals, which seriously limits its application range.

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