JPS6257701A - Production of stainless steel checkered plate - Google Patents

Abstract

PURPOSE:To obtain a checkered steel plate having a good surface characteristic and beautiful checker patterns by limiting the temp. conditions in the hot rolling stage of the stainless steel checkered plate. CONSTITUTION:The hot rolling of the stainless steel checkered steel plate is executed at the rolling end temp. ranging from 780 deg.C to 950 deg.C. The grain boundary oxidation of a high temp. progresses and the surface is cracked if the upper limit temp. exceeds 950 deg.C. The deformation resistance value increases to >=20kg/mm<2> if the lower limit temp. is <=780 deg.C. The deteriorated workability, the roughened surface of rolls and the poor shapes of the checker patterns are then resulted. The stainless steel checkered plate having the good surface characteristic and beautiful checker patterns is thus obtd. when the rolling end temp. is maintained at 780-950 deg.C.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a hot rolling method for producing stainless steel strips with good surface properties and beautiful stripes.

Conventional technology Carbon steel striped steel plates are manufactured by hot rolling, but as in the present invention, stainless steel stripes are produced by hot rolling. 4 plates have not been manufactured.

Problems to be solved by the invention Stainless steel striped steel plate under the same conditions as carbon steel striped steel plate 5! When manufactured, stainless steel is prone to cracking and surface flaws due to grain boundary oxidation at high temperatures. Furthermore, since it contains a large amount of alloying elements, it has high deformation resistance, and it is difficult to form beautiful stripes, resulting in a decrease in the appearance value of the product.

Means for solving the problem Stripes in ferritic and austenitic stainless steel I
In the hot rolling method of J4 plate, the rolling end temperature of the striped roll is carried out in the range of 780°C to 950°C, so that the surface quality is good and the stripes are beautiful. A manufacturing method is provided.

Next, the reasons for the limitations of the present invention will be explained.

If the upper limit of the rolling end temperature is 950°C or higher, grain boundary oxidation will proceed at high temperatures, which is undesirable, and cracks will occur on the surface if rolled with striped rolls.

If the lower limit temperature is below 780℃, the deformation resistance value will be 20kg.
/d or more, the workability deteriorates. Therefore, it is necessary to apply a large rolling load, which results in unreasonable deformation, roughening of the roll surface, and deterioration of the shape of the stripes. Due to the above-mentioned limitations, the preferred rolling finish temperature for ferritic stainless steel strips is from 780°C to 870°C.
The preferable rolling completion temperature for a striped sheet of riostenitic stainless steel is 860°C to 950°C.

Function The present invention is based on the discovery of certain conditions that should make it possible to manufacture stainless steel stripes that could not be manufactured conventionally. In other words, the upper limit of the rolling end temperature of ferritic stainless steel is 87.
It has been found that grain boundary oxidation of striped steel sheets can be prevented if the upper limit of the rolling end temperature of austenitic stainless steel is 0°C or lower than 950°C. Further, in the case of ferritic stainless steel, the workability is good if the deformation resistance value is 20 kg/d or less, and the lower limit of the temperature is 780° C. or more. Similarly, in the case of austenitic stainless steel, the deformation resistance value is 30 hg.
It has been found that workability is good if the temperature is below /-, and the lower limit of the temperature is 860°C or higher.

Effects of the Invention Based on the above results, by limiting the rolling temperature conditions during rolling using a striped roll in the final stand of a hot continuous rolling mill, it is possible to achieve a beautiful striped appearance with excellent appearance and good surface quality. It is now possible to manufacture stainless steel ES (tct41ffl).

Implementation example -1 (summer) Ferrite type (SUS430) chemical composition ■
Rolling conditions and results (3) Figure 1 shows the relationship between deformation resistance and rolling end temperature of the striped roll.

Example 2 (1) Austenitic (SUS304) chemical composition ■ Rolling conditions and results (3) Figure 2 shows the relationship between deformation resistance and rolling end temperature of the striped roll.

In both Examples 1 and 2, a striped roll was used at the 6th stand of the finishing rolling mill of the continuous hot rolling mill, and the plate thickness was 1.
This is the result of manufacturing 5 to &0 dragons.

As shown in Examples 1 and 2 (in the hot rolling method of stainless steel striped steel sheets, the rolling temperature with the striped roll is limited to 780°C to 950°C, the shape of the stripes is beautiful and the surface flaw property is improved. It has become possible to manufacture stainless steel striped steel sheets with good roll surface roughness.

[Brief explanation of drawings]

Figure 1.2 shows the relationship between deformation resistance and rolling end temperature of the striped roll.

Claims (1)

[Claims] 1. A method for producing a stainless steel striped steel sheet, characterized in that the hot rolling method for the stainless steel striped steel sheet is carried out at a temperature at which rolling with striped rolls is completed in the range of 780° C. to 950° C.