JPS58145382A - Manufacture of clad steel plate - Google Patents

Abstract

PURPOSE:To manufacture clad steel at high rolling yield, by build-up welding a cladding material on the surface of base metal different in thickness stepwise to form a slab uniform in thickness and dividing parts of different clad ratio after hot rolling. CONSTITUTION:A stepped base metal 6 having different thicknesses T1 and T2 is manufactured and an angle theta of the surface of the base metal 6 is made greater than 100 deg.. Cladding materials 4 of different kinds are build-up welded on the surface of the base metal 6 to build-up thicknesses of t1, t2 to effect T1+ t1=T2+t2. The build-up welded slab is heated uniformly to about 1,200 deg.C in a heating furnace and hot-rolled to obtain a clad steel plate having different clad ratios in the same steel plate. By dividing this clad steel plate into steel plates of the same clad ratio, clad plates having desired clad ratio and size can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing a clad steel plate, and more particularly, to a method for producing a clad steel plate with a rolling yield as high as 4I.

Conventionally, there are various methods for manufacturing clad steel plates by hot rolling, but in all of them, 1a is produced by hot rolling from a slab by an assembly method, a sensual welding method, an explosion bonding method, or the like. FIG. 1 shows a slab after assembly, in which a laminate material 4 and a base material 6 are arranged on both sides of the separating material 2, and the surrounding portions 8 are in contact with fII.

FIG. 2 shows a slab produced by the sensuous welding method, in which a cladding material 4 is overlay-welded to a base material 6.

Conventionally, when hot-rolling a slab consisting of the above-mentioned laminate material 4 and base material 6, in C145, the stretching ratios of the laminate material 4 and the base material 6 differed due to the difference in deformation resistance. Since the ratio was different, the end portion did not become a product and a large amount of clog was generated.

For example, JIS 8841100 ■ thick base material and JIS
316 32■ A slab made of laminate with a width ratio of 2
When hot-rolled at a certain temperature, the edge t of the clad steel plate becomes only the base metal, as shown in Figure 3, and the edge m of the cladding material is thinner and has a lower cladding ratio than the center. Therefore, both of these four copies will not become a product. In the above example, the width of the ring is 50~60WIIISm
It is 30-50m1 degree, and when these are combined, it is 80-11
A shortcoming occurred in which the zero grain became a crop and reduced the rolling yield of the clad steel sheet.

SUMMARY OF THE INVENTION An object of the present invention is to solve the problems of the prior art described above and to provide a method for manufacturing a crushed steel plate with an excellent rolling yield.

The gist of the present invention is as follows.

That is, in a method for manufacturing a clad steel plate in which a laminated material is overlay welded to a base material and then hot rolled, there are two steps: processing the base material into different plate thicknesses in a stepwise manner, and forming a cladding material on the surface of the processed base material. a step of physically welding the laminate materials so that the total thickness of the material and the laminate material is the same throughout the slab; a step of hot rolling the sensually welded slab; dividing the parts;
This is a method for manufacturing a clad steel sheet.

In other words, aiming at clad steel plates of the same material but different cladding ratios, the plate thickness T was determined as shown in Figure 4.
A base material 6 having different step shapes of I and T is produced by rolling or machining 42, and after death, this base material 6 is used to overlay a cladding material 4 as shown in FIG. 5. The overlay welding of this laminate 4 may be performed by any welding method such as submerged arc welding using a strip-shaped dtIIIA or electroslag bath welding. Figure 5 shows a welding method using a strip electrode. While maintaining a constant thickness in the hand direction, the thickness of the overlay is changed in a stepwise manner by changing the number of bath contact passes in the width direction, resulting in a round shape. i#! In Fig. 5, T11Ts is the thickness of the base material 6, 1. ．． 1. Inner overlaying is performed so that the overlay thickness of the joining material 4 is T1+tt=Tm+b. The shape of the step part of the base material is rounded to prevent defects such as slag entrainment when performing tactile welding near the step part.
It is desirable that the temperature be at least 100%.

Next, as shown in Fig. 5, the slabs with different thickness welded to the base metal are spun in a heating furnace at 1200°C, heated with a leveling machine, and then hot compressed to create different cladding within the same steel plate. It is possible to obtain a clad steel plate having the following ratio.

A clad steel plate having different cladding ratios in the width direction of the steel plate can be obtained by rolling the slab in FIG. 5 so that the direction of the visible weld line becomes the longitudinal direction of the steel plate. By rolling the steel plate so that the direction of the unidirectional weld line is in the width direction of the steel plate, a steel plate having different cladding ratios in the longitudinal direction of the steel plate can be obtained.

Clad steel plates with different cladding ratios within the same steel plate are length-divided or width-divided into steel plates with the same cladding ratio using gas or shear, etc., to obtain clad steel plates having the desired cladding ratio and dimensions. can.

In the method of the present invention, since a plurality of steel sheets with different cladding ratios are manufactured simultaneously, it is possible to increase the unit weight of the slab. It can be expected that the rolling yield will be improved by 3 to 5 due to the effect of increasing the size and the reduction in crop loss at the edges of the deferred steel sheet.

EXAMPLE As shown in FIG. 6, a slab consisting of a base material and a laminate having the following materials and dimensions was manufactured by sensual welding.

Base material JI8 8841 Compatible material JI8 8U8! 11
6L Base material thickness Zoo and 130 - Laminated material thickness 32 and 12■ The above slabs were heated to a temperature that does not cause intergranular oxidation of stainless steel and rolled in the longitudinal direction to make the slabs tenter by the normal clad rolling method. The thickness of the laminated material is &6 and 1.4■, and the thickness of the base material is 1.
1.4 and 146cm, cladding ratio 24 and 9-, and steel sheets with different cladding ratios in the same steel plate 1
5. A clad steel plate with a length of 3,000 mm and a length of 11,000 mm was manufactured, and this steel plate was cut with gas to achieve a clad ratio of 24.
We can manufacture two types of clad steel plates: - and 9Is! friend.

Embodiment 1 of the present invention: The range in which the cladding ratio of the hot-rolled material at the boundary with different cladding ratios fluctuates is about 20 to 40 cm, and the crop loss per end of the divided nine steel plates is half of this width. become. However, as mentioned above, the crop loss at the edges of the conventionally manufactured clad steel sheet reaches 80 to 110 cm, and in this example, the crop loss at the edges is significantly smaller than in the conventional method, and the rolling yield is improved. It is possible to achieve an effect that can improve the

As is clear from the above embodiments, the method of the present invention produces clad steel plates having different cladding ratios within the same steel plate by subjecting base materials of different thicknesses in a stepped manner to +lfL hot pressing, and further cladding By dividing the parts with different ratios, it is possible to produce a clad steel plate with a high rolling yield.

[Brief explanation of the drawing]

Fig. 1 is a side view showing a slab for clad steel plate using the assembly method, Fig. 2 is a side view showing a conventional welded overlay slab for clad steel plate, and Fig. 3 shows the shape of the end of a conventional clad steel plate. A schematic cross-sectional view, FIG. 4 shows the base material of the present invention.
FIG. 5 is a perspective view showing an overlay f# rutted slab according to the present invention, and FIG. 6 is a perspective view showing a tactile welding slab according to an embodiment of the present invention. 4... Lamination material 6... Base material agent Takeo Nakaji Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] (1) A method for producing a clad steel plate in which a heat seal is applied after a cladding material is brought into contact with a base material f#, which includes the steps of processing the base material into different plate thicknesses in a stepped manner, and the surface of the processed base material. a step of sensually welding the laminate materials so that the total thickness of the base material and the laminate material is the same throughout the slab; a step of hot rolling the sensually welded slab; and a step of adjusting the cladding ratio of the hot rolled material. and dividing the different parts.
A method for producing wrinkled clad steel sheets.