Production method of cold-rolled strip steel for titanium microalloying refrigerator side plate under non-refining process condition

Abstract

The invention relates to a production method of cold-rolled strip steel for a titanium microalloying refrigerator side plate under a non-refining process condition. The cold-rolled strip steel comprises the following chemical components: 0.06%-0.10% of C, 0.05%-0.12% of Si, 0.30%-0.45% of Mn, less than or equal to 0.025% of S, less than or equal to 0.025% of P, greater than or equal to 0.015% of Als and 0.025%-0.040% of Ti. Under the non-refining condition, deoxidation alloying, steel ladle slag washing and molten steel component optimization are carried out, the pouring protection effect is improved, hot rolling, controlled rolling and controlled cooling and cold rolling cover annealing processes are optimized, and operation steps of converter operation, argon blowing, continuous casting, hot rolling and cold rolling are carried out. According to the production method, the alloy cost is reduced while the product performance is ensured, and the inclusion content of molten steel is reduced. The yield strength of the cold-rolled steel strip is 330-380 MPa, the tensile strength of the cold-rolled steel strip is 440-480 MPa, and the percentage elongation after fracture of the cold-rolled steel strip is 22-26%.

Description

technical field [0001] The invention relates to a production method of steel for refrigerator side panels, in particular to a production method of cold-rolled strip steel for titanium microalloyed refrigerator side panels under non-refining process conditions. Background technique [0002] Steel for refrigerator side panels is a low-alloy structural high-strength steel with good mechanical properties and welding properties. It is used in furniture, home appliances and other fields. [0003] The national standard has specific restrictions on the weight content of some elements of Q235B, among which C≤0.20%, Si≤0.35%, Mn≤1.40%, P≤0.045%, S≤0.045%, Cr≤0.3%, Ni≤0.3% , Cu≤0.4%, N≤0.008%; traditional Q235B production method C: 0.15-0.19%, low strength and unstable quality; non-refining conditions have high inclusion levels and unstable surface quality of hot-rolled strip steel, which often occurs Surface peeling defects affect yield quality. [0004] In order to solve the above-...

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Problems solved by technology

Although the above operations can be used as refrigerator side panels, the overall yield strength and tensile strength are controlled to be low, and the annealing method is continuous annealing

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