JPS59209497A - Production of stainless cald steel by brazing and rolling method - Google Patents

Abstract

PURPOSE:To produce a clad steel at a low cost by a simple method by sandwiching a copper alloy having the m.p. higher than a specific temp. between a cladding material and a base material and heating the entire part to the above- mentioned m.p. or above then rolling the materials at the temp. below the above- mentioned m.p. CONSTITUTION:A copper alloy having >=900 deg.C m.p. is sandwiched as an insert metal between a base material which is a carbon steel or low alloy steel and a cladding material which is a stainless steel. The entire part of the sandwiching material is heated to the temp. region above the m.p. of the copper alloy. The heated materials are then rolled in the temp. region below the m.p. of said copper alloy and a desired stainless clad steel is produced. The copper alloy used is, for example, 90% Cu-10% Ni having about 1,130 deg.C m.p. The stainless clad steel is thus obtd. at a low cost by the simple method.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing stainless steel clad steel using a brazing rolling method, and particularly to a manufacturing method that is simple and economical.
Related.

With the development of industrial production, the environment in which materials are used is becoming more severe year by yearC.
As a result, it becomes difficult to respond using a single material, and even if it is possible to do so, there are increasing cases in which extremely expensive materials have to be used. In order to cope with use in such harsh environments, composite materials have been developed in which two or more types of materials are bonded together to complement each other by taking advantage of their well-defined material properties, so that they can be used more appropriately depending on the application. Examples of commonly sold composite materials include composite materials made of copper alloy or stainless steel, and composite metal materials made of mild steel or low-alloy steel as a base material.The composite materials provide corrosion resistance and the base material provides strength. It is used as a material for marine structures and chemical equipment.

The overlay method, explosion bonding method, assembly-and-rolling method, casting method, and bath fusion bonding method are known as methods for manufacturing this type of composite metal material, but all of these methods have the following problems. have.

In other words, the overlay method is a method in which 7lux is placed on the base material, and the thin coil is melted with an arc and bonded to the base material, and the alloy composition of the flux and thin coil is controlled to achieve the desired composition of the laminated material. However, since this method re-melts the expensive thin coil, the cost is higher than other manufacturing methods when the ratio of composite material to base material is large. Since the gunpowder itself is expensive, and the places where gunpowder can be used are limited, it is generally difficult to adopt.Next, the upright rolling method is a widely used method, and it is difficult to use it in general because the gunpowder itself is expensive and the places where it can be used are limited. '
c After applying 7fG, the laminate material and base material are stacked and welded around the four circumferences, and subjected to heavy reduction rolling at high temperature to obtain a mating metal material. In this method, the laminate material and base material to be joined are Smooth finishing of the surface is essential for increasing the bonding area and bonding strength, and the cost of roughening including surface cutting is high (also, in this method, the rolling process involves In order to bond the materials, a high rolling reduction rate of at least a certain level is required during rolling.

In addition, in the casting method, the base material or the composite material, whichever has a higher melting temperature, is placed in a mold, the other is melted and poured into the mold, and the composite metal is produced through blooming and hot rolling. In this method, scum is often involved during casting (if scum is involved, the joint will be defective in that part). The boiling method disclosed in Place the laminated material with a lower melting temperature than the base material and the flux that covers the top surface on the base material with a frame, and heat the entire body (at least in a non-oxidizing atmosphere) so that only the laminated material is removed from the base material. This method involves melting the slab and holding it sufficiently to cause diffusion at the interface between the two, then cooling it to form a composite slab while controlling the melt-solidified structure, and then hot rolling, but the material of the laminated material is limited. be done.

As mentioned above, each conventional method for manufacturing composite metal materials has its own limitations or problems, and requires advanced technology and complicated processes to solve them.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems of the prior art and to provide a method for producing stainless clad steel with simple steps and low cost.

The gist of the present invention is as follows.

In other words, charcoal 5N? A step of sandwiching a copper alloy with a melting point of 900C or more as an insert metal between a base material of A or low alloy silver and a composite material of stainless steel, and placing the entire sandwiched phase in a temperature range above the melting point of the copper alloy. A method for preparing stainless steel using a brazing rolling method, comprising the steps of: heating the heating material; and rolling the heating material in a temperature range below the melting point of the steel alloy. .

The details of the invention will be explained by means of illustrated examples. As shown in the attached drawings, first, a copper alloy with a melting point of 900°C or more is placed on a base material 2 of carbon steel or low alloy copper as an intra metal 4, and then a stainless steel (Z) mating material 6 is placed on top of it. (.

Next, the stacked sandwich materials are charged into a furnace and heated to a temperature range above the melting point of the insert metal 4 to melt only the insert metal 4, and then taken out from the furnace and the insert metal 4 is solidified. Wait for the steel plate to melt and then roll it to produce stainless clad steel f3 of the required thickness.

16 on the 6th mark of the book, insert metal 4: check point 9
The reason for limiting the temperature to 00°C or higher is due to the following Uyama. That is,
The stainless steel of the composite material 6 contains 41'0% or more of Cr, and in order to further improve corrosion resistance and workability, Ni,
Since alloying elements such as Mo, Cu, Si, and Aj2 are added as necessary, the hot deformation resistance is high, and in order to effectively roll the sandwich material, the higher the temperature, the more advantageous it is. (A rolling temperature of 900°C or higher is required for rolling. Also, heating of 90°C or higher is required to uniformly dissolve the alloying elements into the insert metal during heating. The melting point of the copper alloy, which is the insert metal, has been exceeded.If rolled in a temperature range, the strength of the joint will decrease and the base material 2 and the mating material 6 will separate.For these reasons, in the present invention, the melting point of the copper alloy that is the insert metal is 9
The heating temperature was limited to 00°C or higher and below the melting point of the copper alloy, which is the rolling temperature range of the heated slab.

60+nm x 1 with each example surface polished to No. 80
00 mm x 200 mm rolled steel plate for welded structure 5
M41 and 4 mm x 100 rrlrrIX 20
0 mm stainless f3 plate SO5304 and 0.2
rrrnX 100rrFr1X 200 m+n's 9
7Q% of the same size as the 0%Cu-1,0%N1 alloy plate
Each Cu-30%Mn alloy plate was prepared.

These (7) S A, 1416q board S U S 30
A Cu-Ni alloy plate and a Cu-Mn alloy plate were sandwiched between 4 mm plates as insert metals, and the entire sandwich was placed in a heating furnace maintained at 1200°C and heated for 1 hour in an argon atmosphere. After heating, the material was allowed to cool, and rolling was started when the temperature of the material reached 1,100° C. and 800° C., respectively, to obtain a stainless clad steel plate with a thickness of 3 mm.

The rolling results of these four types of test materials are shown in Table 1. 1st
In the table, marks Q indicate that the insert metal could be rolled to 3 mm, but marks X indicate that the laminated material and the base material peeled off during rolling (2) It was impossible to roll.
- 8 in the case of the present invention example using a 10% Ni alloy plate
It was possible to roll the sample to 3 mm at either rolling start temperature of 00°C or 1100°C. However, in the case of a comparative example in which a 70% Cu -30% Mn alloy plate, which has a melting point of 890°C and does not satisfy the limiting conditions of the present invention, is used as the insert metal, rolling at a rolling start temperature of 1100°C results in one pass. 5 by eye
The M41 steel plate and the SUS 304 steel plate peeled and could not be rolled. Furthermore, when rolling is performed at a rolling start temperature of 800°C,
Due to the low rolling temperature at which it was possible to roll the product to 3 mm, the deformation resistance increased, the number of times of rolling to achieve a predetermined thickness increased, and the rolling efficiency significantly decreased, making it impractical.

As is clear from the above examples, the present invention has a melting point of 900
A copper alloy of 0 or more is sandwiched as an insert alloy between stainless steel as a mating material and carbon steel or low alloy steel as a base material,
By heating the entire sandwich material above the melting point and then rolling it at a temperature below the melting point, it was possible to produce stainless clad steel in an extremely simple manner and at low cost. Note that the present invention can be widely applied not only to the production of stainless clad steel plates or copper strips, but also to the production of double steel pipes or multilayer copper plates.

[Brief explanation of the drawing]

FIG. 1 is a schematic sectional view showing a state in which an insert metal is sandwiched between a base material and a laminated material of the present invention. 2... Base material, 4... Insert metal, 6... Laminating material. Agent Patent Attorney Takeo NakamichiFigure 1

Claims (1)

[Claims] (1) A step of sandwiching a copper alloy with a melting point of 900°C or higher as an insert metal between a base material of carbon steel or low alloy steel and a mating material of stainless steel, and sandwiching the entire sandwiching material with the melting point of the copper alloy. Stainless steel manufactured by a brazing rolling method, characterized in that the stainless steel is heated in the above temperature range, and the step of rolling the added 6# in a temperature range below the contact point of the copper alloy. Manufacturing method of cladding (J) 1.