Cold-rolled strip steel for condenser tube of refrigerator and manufacturing method thereof

Abstract

The invention relates to a cold-rolled strip steel for a condenser tube of a refrigerator and a manufacturing method for a cold-rolled steel plate and mainly aims to overcome the technical problem of poor matching between strength and toughness of a conventional condenser tube of a refrigerator. According to a technical scheme of the invention, the cold-rolled strip steel is characterized by comprising the following chemical components by mass: 0.001 to 0.003% of C, no more than 0.03% of Si, 0.10 to 0.20% Mn, no more than 0.015% of P, no more than 0.008% of S, 0.015 to 0.060% of Alt, 0.0004 to 0.001% of B and 0.020 to 0.040% of Ti, with the balance being Fe and inevitable impurity elements. The manufacturing method comprises the following steps: desulphurization pretreatment of molten iron, slag removal, smelting in a converter, refining in an RH furnace, continuous casting, hot rolling, laminar cooling, cold rolling and annealing, wherein a continuous casting sheet billet is heated to a temperature of 1000 to 1080 DEG C, initial rolling temperature of finish rolling is 950 to 1000 DEG C, a finishing rolling temperature of finish rolling is 930 to 950 DEG C, a compression ratio in a finish rolling stage is 80 to 86%, a coiling temperature during finish rolling is 600 to 660 DEG C, and a reduction rate of cold rolling is 80 to 90%. The cold-rolled strip steel provided in the invention is applicable to manufacturing of the condenser tube of the refrigerator.

Description

technical field [0001] The invention relates to a cold-rolled steel strip for refrigerator condenser pipes, and to a manufacturing method of the cold-rolled steel plate. Background technique [0002] At present, the cold-rolled strip steel used for refrigerator condenser pipes is generally SPCC. The carbon content of this steel is relatively high, and the range of carbon content is also wide. The carbon content is controlled at 0.04-0.15%. The strength and plastic toughness of the material cannot be well matched, and the stability of performance is also poor, which increases the difficulty of controlling the equipment for producing refrigerator condenser products. During the production process, the diameter of refrigerator condenser products cannot be kept constant, and the thickness is uneven. It has a great impact on the quality of the product, and directly affects the cooling effect of the finished refrigerator, reduces the service life of the refrigerator, and increases ...

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to: aim at the disadvantages of poor strength and toughness matching in the prior art, to provide a cold-rolled steel strip for refrigerator condenser pipes with a yield strength in the range of 180-230 MPa and a hardness of HR30T in the range of 30-50. Its manufacturing method is given, which adopts low-carbon, low-silicon, aluminum and titanium deoxidation and grain refinement elements, and uses inclusion shape control, hot continuous rolling controlled cooling and continuous annealing temperature control methods for production, so that It is helpful to ensure that the yield strength and hardness of the steel of the present invention are within the specified range, and at the same time, it has excellent comprehensive properties such as high elongation after fracture, good processing and forming performance, good welding performance, and high cost performance

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