Manufacture method capable of improving patterns of common-type ferrite stainless steel plate

Abstract

The invention provides a manufacture method capable of improving patterns of a common-type ferrite stainless steel plate, which is characterized by comprising the following processes of: single-pass cold rolling with black skin, annealing, pickling, cold rolling again, annealing again, pickling again and leveling. The manufacture method utilizes the characteristic that a heat treatment continuous annealing pickling production line is equipped with an S6 cold rolling machine, single-pass rolling with black skin is performed at the reduction of 30-40% by using the cold rolling machine which is arranged for rolling austenitic stainless steel, then sufficient recrystallization annealing is performed at the temperature of 820-900 DEG C, and sequent cold rolling and heat treatment processes are performed according to a conventional method. The manufacture method can effectively improve the patterns of a common-type ferrite stainless steel finished product (2B) without adding stabilizing elements such as Nb, Ti, V and the like or using a special heat treatment process, thus saving the alloy cost, improving the production efficiency, and improving the patterns of the plate.

Description

technical field [0001] The invention relates to the field of manufacturing ferritic stainless steel products, in particular, the invention relates to a manufacturing method capable of improving the pattern of ordinary ferritic stainless steel plates. Background technique [0002] The production process of traditional ferritic stainless steel without plate pattern is pickling → cold rolling → annealing (pickling) → cold rolling → annealing (pickling) → smoothing, ordinary ferritic stainless steel, such as Cr content in 12 % to 17% range of low and medium Cr ferritic stainless steel, after being manufactured into cold-rolled finished 2B plate or BA plate (especially with a thickness of 0.8mm or more), the surface is prone to fine lines along the rolling direction, Generally, the thicker the cold-rolled sheet, the more serious this phenomenon is, which is usually called "plate pattern" or "wrinkling". This phenomenon only occurs in ferritic stainless steel, which affects the a...

AI Technical Summary

Problems solved by technology

This phenomenon only occurs in ferritic stainless steel, which affects the appearance of the material

[0003] Generally speaking, the methods to improve the surface pattern of ordinary ferritic stainless steel include increasing the proportion of equiaxed grains in continuous casting slabs or reducing the finishing temperature of hot finish rolling. However, according to actual production experience, the former is limited by the ability of equipment to improve It is not obvious; while the latter can effectively improve the plate pattern, but it increases the risk of other surface defects and broken strips, such as process quality defects such as edge cracks, edge scales, and oxygen bites, and low-temperature rolling leads to finish rolling in the two-phase region of the material, It is easy to produce edge cracks and cause broken strips, etc. To eliminate these defects, higher processing costs are required, which directly affects the use of this type of stainless steel

[0004] The method disclosed in Chinese patent document 99801478.5 (ferritic stainless steel with good deep drawing and wrinkle-like deformation resistance and its manufacturing method) mainly uses pure ferritic stainless steel with lower C and N content, by adding stabilizing elements Ti, Nucleation elements such as Nb and V, as well as Ti / N≥12, V / Nb: 2~5, hot rolling temperature controlled at 1170~950°C to complete rough rolling and other methods to control the stripping or wrinkling of the final cold rolled sheet, Among them, the alloy cost has increased significantly, and the cold rolling control method or process is not involved

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