Cold-rolled steel sheet for precise household appliance welded pipe and production method thereof

Abstract

The invention discloses a cold-rolled steel sheet for a precise household appliance welded pipe and a production method thereof. The cold-rolled steel sheet comprises the following chemical components of, in percentage by mass, larger than or equal to 0.0030 wt% and less than or equal to 0.0050 wt% of C, larger than or equal to 0.15 wt% and less than or equal to 0.20 wt% of Mn, less than or equal to 0.010 wt% of Si, less than or equal to 0.012 wt% of P, less than or equal to 0.010 wt% of S, larger than or equal to 0.025 wt% and less than or equal to 0.050 wt% of Als, less than or equal to 0.0035 wt% of N, larger than or equal to 0.055 wt% and less than or equal to 0.070 wt% of Ti and the balance Fe and other residual trace elements. According to the production method, a plate blank with the thickness of 230 mm is continuously casted through a steelmaking process, is subjected to heating treatment through a hot rolling process, and then is subjected to continuous rolling treatment at a high temperature, front-section rapid laminar cooling treatment, U-shaped high-temperature coiling treatment, and natural air-cooling treatment to 60 DEG C or below to obtain a hot-rolled coil with a uniform ferritic structure and fully coarse precipitation of two-phase particles, then a cold hard roll is prepared through an acid rolling process, then is subjected to strong cleaning treatment and medium-high temperature continuous annealing treatment and then is slightly leveled, and a longitudinal thickness difference part is cut off in a finishing procedure to obtain a proper finished steel coil; and the production method realizes batch production and stable supply of a cold-rolled steel sheet product for the precise household appliance welded pipe with the full thickness specification of 0.45-0.70 mm.

Description

technical field [0001] The invention belongs to the technical field of metal material processing, and in particular relates to a cold-rolled steel plate for precision home appliance welded pipes and a production method thereof. Background technique [0002] At present, key pipe fittings such as evaporators, condenser pipes, and connecting pipes widely used in the home appliance industry are made of precision welded pipes with a wall thickness of no more than 0.8mm (usually 0.45-0.70mm). In the increasingly fierce market competition, in order to improve production efficiency and reduce production costs, relevant production enterprises usually use cold-rolled steel sheets with excellent formability. After zinc and nitrogen filling inspection, it is processed into this kind of precision welded pipe. According to the calculation of the Precision Steel Tube Association, the annual demand for cold-rolled steel plates for precision home appliance welded pipes exceeds 200,000 tons,...

AI Technical Summary

Problems solved by technology

The yield strength of the products produced by the above-mentioned "a cold-rolled steel strip for double-layer welded pipe and its manufacturing method" and "a cold-rolled steel plate for continuous brazing type double-layer welded pipe and its manufacturing method" are all too high. It is beneficial to high-speed cold drawing and diameter reduction production after pipe making, which reduces the processing efficiency of users and cannot fully meet the requirements of steel for precision home appliance welded pipes

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