JPH05156358A - Continuous solid solution heat treatment method for stainless shape steel - Google Patents

Abstract

PURPOSE:To provide a solid solution heat treatment method, which the solid solution heat treatment can continuously by executed to a stainless small-sized shape steel so that the straightening can do in a little. CONSTITUTION:A rolled shape or a flat steel, 12 wound as coil-state after rolling is heated at 920-1100 deg.C by conducting electric current while passing through between electrode rolls 16, 16 to execute the solid solution heat treatment. The solid solution heat treatment can be executed in the condition of continuing the rolled material 12 in extreme efficiency. Further, the solid solution heat treatment car be executed in the condition of applying the stretching and the straightening of the rolled material thereafter can do in extremely a little.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to austenitic stainless steel shaped steel (including chevron and flat steel). Especially, chevron steel has a width of about 35 mm or less, and flat steel has a width of 30 mm.
TECHNICAL FIELD The present invention relates to a continuous solution heat treatment method for small and small rolled materials.

[0002]

2. Description of the Related Art When austenitic stainless steel is hot-rolled, carbides are precipitated at grain boundaries during the cooling process during rolling, which easily causes intergranular corrosion and deteriorates corrosion resistance. Therefore, the hot-rolled shaped steel is 100
The solution heat treatment is performed by heating to a high temperature of 0 ° C. or higher.

[0003]

However, in the case where the shaped steel is as thin as about 30 mm in width and about 3 mm in thickness as described above, if it is cut into a standard size and bundled to form a solution heat treatment, it is rolled. The material is extremely deformed. Therefore, the straightening after the solution heat treatment requires flattening and then stretching, which is very troublesome.

The present invention solves the above-mentioned problems in solution heat treatment of austenitic stainless steel shaped steel, particularly small rolled steel having a width of 25 mm or less for angle steel and 30 mm or less for flat steel. An object of the present invention is to provide a continuous solution heat treatment method for stainless shaped steel which is capable of continuous solution heat treatment and does not require correction of the rolled material after solution heat treatment.

[0005]

In order to solve the above-mentioned problems, the inventor has repeatedly studied to carry out solution heat treatment before the material is cut in a rolled state to a predetermined size. It was As a result, if the rolled material is passed between the electrode rolls and heated to the solution temperature by electric heating during that,
The present invention has been completed by finding that the rolled material can be continuously solid-solubilized and that the subsequent straightening is extremely easy.

The continuous solution heat treatment method for stainless shaped steel of the present invention uses a wire rod wound around a coil as a raw material, and a shaped steel which is shape-rolled by hot and cold compound rolling while unwinding the raw material. While passing between the electrode rolls 9
The gist is to carry out a solution treatment by electrically heating to 20 to 1100 ° C.

The rolled material passed between the electrode rolls may be a rolled material immediately after the shaping rolling is finished, or may be rolled and once wound into a coil. As for the current heating temperature of the rolled material, a desired temperature can be obtained by adjusting the distance between the electrodes and the feed rate of the rolled material.

The coil or the rolled material drawn from the rolling process is preferably electrically heated under a slight tension in order to reduce bending due to heating, and may be straightened after electrically heating. Since it is preferable, a straightening roll that both stretches and straightens the rolled material is arranged at the tip of the electrode roll. This straightening roll uses a hole-shaped roll in the case of shaped steel, and uses a turks head in which horizontal rolls and vertical rolls are combined at right angles in the case of flat steel.

[0009]

The continuous solution heat treatment method for stainless shaped steel according to the present invention uses a wire rod wound around a coil as a raw material, and a shaped steel or a flat steel obtained by shaping and rolling by hot and cold compound rolling while unwinding the raw material. The steel is subjected to solution heat treatment by being electrically heated to 920 to 1100 ° C while passing between the electrode rolls, so that the solution heat treatment can be performed in a continuous state of the rolled material, and the solution heat treatment is extremely efficient. Done. Also,
Solution heat treatment is possible in the stretched state, and the subsequent correction of the rolled material is extremely small.

The solution heat treatment temperature is set to 920 to 110.
The reason for setting the temperature to 0 ° C. is that if the temperature is lower than 920 ° C., sufficient penetration of carbides and the like is insufficient, and if the temperature exceeds 1100 ° C., the above-mentioned effect cannot be expected to be improved, and scales are often generated. Further, if the rolling material is heated at 1000 ° C., about 5 to 15 seconds is sufficient.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic side view of a solution heat treatment apparatus for carrying out the method of the present invention. A rolled material 12 is pulled out from a coil 10 made of flat steel by a pinch roll 14 that also serves as a straightener.

The rolled material 12 pulled out by the pinch rolls 14 is caught by two pairs of electrode rolls 16 and 16 which are arranged at regular intervals. A power source 18 is connected between the two pairs of electrode rolls 16 and 16 to roll the rolled material 1
2 is 920 to 11 while passing through the electrode roll 16.
It is electrically heated to 00 ° C.

Rolled material 12 passed through the electrode roll 16
Is straightened by the straightening roll 20 and the shearing 2
It is cut to a standard size by 2. A slight tension is applied to the rolled material 12 between the straightening roll 20 and the pinch roll 14, and the rolled material 12 is continuously subjected to solution heat treatment in a tensioned state.

Using the solution heat treatment apparatus of this example, the rolled material of austenitic stainless steel was subjected to solution heat treatment. That is, the rolled material 12 is pulled out from the deformed flat steel coil 10 having a width of 30 mm and a thickness of 3 mm by the pinch rolls 14 to be caught in the electrode rolls 16 and passed between the electrodes while applying tension with the correction rolls 20. In the meantime, it heated at 1050 degreeC by electric heating.

The distance between the electrodes was adjusted so as to pass between the electrode rolls 16.16 in 15 seconds, and the rolled material 12 was examined. As a result, the intergranular carbide was completely dissolved. Further, since the rolled material 12 is straightened by the straightening rolls 20, the subsequent straightening of the rolled material can be remarkably omitted, thus confirming the effect of the present invention.

[0016]

INDUSTRIAL APPLICABILITY As described above, the continuous solution heat treatment method for the stainless shaped steel of the present invention passes the rolled shaped steel or the rolled flat steel rolled into a coil shape between the electrode rolls. It is characterized in that the solution treatment is performed by electrically heating to 920 to 1100 ° C. while performing the solution treatment, and the solution heat treatment can be performed in a continuous state of the rolled material, and the solution heat treatment can be performed very efficiently. Be seen. Further, the solution heat treatment can be performed in the stretched state, and the subsequent correction of the rolled material is extremely small.

[Brief description of drawings]

FIG. 1 is a schematic side view of a solution heat treatment apparatus used for carrying out the method of the present invention.

[Explanation of symbols]

 10 coil 12 rolled material 16 electrode roll 20 straightening roll

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Claims (2)

[Claims] 1. A wire material wound around a coil is used as a material,
A stainless steel shape characterized in that a shaped steel that has been shaped and rolled by hot and cold compound rolling while rewinding the material is subjected to solution treatment by being electrically heated to 920 to 1100 ° C while passing between electrode rolls. Continuous solution heat treatment method for steel. 2. A flattened steel which is shaped and rolled by hot and cold compound rolling and is wound into a coil, is subjected to a solution treatment by being electrically heated to 920 to 1100 ° C. while passing between electrode rollers. A method for continuous solution heat treatment of stainless flat steel.