JPS5829589A - Manufacture of titanium-clad steel plate - Google Patents

Abstract

PURPOSE:To manufacture the titled large-area steel plate which has superior joining strength and bending workability, by joining and rolling while placing the 1st layer of a thin plate, obtained by joining and rolling the 1st layer intermediate cementing material of Nb, etc., and the 2nd layer intermediate cementing material of Cu, etc., on a Ti composite material side and a steel base material side. CONSTITUTION:One of Nb, Nb alloy, Ta, and Ta alloy is used as the 1st intermediate cementing material 1, and one of Cu, Cu alloy, Ni, and Ni alloy is used as the 2nd intermediate cementing material 2; the both are cemented in an explosive press contacting method or diffusion cementing method to form a clad plate 3. This plate 3 is rolled to obtain a thin clad plate 4. This plate 4 is inserted while the cementing material 1' is on the side of the composite material 5 made of Ti or Ti alloy, and the cementing material 2' is on the side of a plate base material 6, and cementing is performed in an explosive press contacting method, diffusion cementing method, or roll press-contacting method to form clad steel 7. Then, the clad steel is rolled to obtain a clad steel plate 8.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing a titanium clad steel sheet that has excellent bonding strength and bending workability even after hot-rolling and heat treatment at high temperatures after rolling.

Explosive crimping is a method for manufacturing titanium-clad steel sheets that have strong bonding strength between titanium and steel and good bending workability. This explosive crimping method is a method of metallurgically joining metal plates of the same or different types by making full use of the explosive energy of explosives.

However, since this manufacturing method is subject to area limitations due to various factors, it is impossible to manufacture a titanium clad steel plate with a wide area. For example, industrially manufactured titanium plates have limitations due to reduced elongation of the strained material. Additionally, there are limitations due to the amount of explosives that can be used. To improve this, attempts have been made to hot-roll titanium clad steel plates to produce wide and long titanium clad steel plates, but this has not yet been commercially implemented.

A method of obtaining clad steel plates for floorboards by hot rolling titanium clad steel plates made by explosively bonding titanium to steel was published in 1973-4.
No. 32. The gist is that titanium clad steel plates in a limited bonded state are
The purpose is to roll at a hot working temperature of 75 to 900°C.

Although this method is an excellent method, since the rolling temperature is lower than that of ordinary steel sheets, the bending workability of the base material may be significantly reduced due to excessive work hardening. When heat treatment is applied to improve the physical properties of the base material, ・1′ and steel 0
It was found that the bonding force decreased significantly by 7", and the shear strength sometimes fell below the JIS standard value of 14.kg7mA for titanium clad steel plates.

As a method for alleviating these drawbacks, there is a method of interposing a medium between titanium and steel. Various methods can be considered for interposing the intermediate material, and sequential joining can be performed by plating, thermal spraying, explosion bonding, diffusion bonding, etc. However, when using the plating method, there are limitations on the metals and combinations that can be plated, and the bonding strength is also weak.

There are also restrictions on combinations of thermal spraying and diffusion bonding.

When using the explosion bonding method, the combination of materials is free, but if the plate thickness is 1 mm or less, it is industrially unacceptable. Generally, the thickness of the junction material layer should be kept to the minimum necessary, and a thickness of several microns to several tens of microns is sufficient to prevent diffusion. Unfortunately, the intermediate material is selected from among high-grade metals, so the amount used must be kept as low as possible or it will lose its industrial value.

As one of the methods of providing a thin layer of intermediate material, Japanese Patent Application No. 1987-
There is No. 128047. In this invention, metals such as nickel, molybdenum, platinum, gold, and silver, which are effective in preventing mutual diffusion, are explosively bonded to steel, and the clad steel plate is first used as a metal material by hot rolling. This explosion-rolled clad steel plate is rolled to the minimum necessary thickness, and this explosion-rolled clad steel plate is interposed as an intermediate bonding layer between the composite material and the base steel, and the explosion-bonding is performed using a conventionally known explosion-bonding method. Furthermore, by hot rolling this, an explosion-bonded rolled clad steel plate with excellent bonding strength without any defective alloy layer or intermetallic compound between the joint surfaces of the composite material and the base material is to be obtained.

However, subsequent experiments revealed that even if all of this method was applied to titanium clad steel sheets, the crimp strength after hot rolling was insufficient.

In other words, the intermediate metals such as nickel, molybdenum, platinum, gold, and silver have excellent bonding performance with similar material steel even after rolling, but the bonding performance with composite material titanium after rolling is poor. It turned out that there was not enough sex.

The inventor of the present invention has finally completed the present invention as a result of various experiments and examinations regarding the defects of titanium clad steel sheets produced by the explosion rolling method.

That is, the present invention uses titanium or a titanium alloy as an all-composite material, uses any one of niobium, niobium alloy, tantalum, and tantalum alloy as the first layer intermediate bonding material, and uses any one of copper, copper alloy, nickel, and nickel alloy. When producing a titanium clad steel plate with steel as the base material, the first layer intermediate medium welding material and the second layer intermediate welding material are joined and then rolled to form a thin plate. After that, the thin plate is joined and rolled so that the first layer intermediate medium welding material is on the composite material side and the second layer intermediate medium welding material is on the base metal side. .

According to the present invention, it is possible to reduce the thickness of the intermediate welding material and obtain one with a large area, which provides excellent joint strength and bending properties even after rolling and even after heat treatment after rolling. It becomes a thing with a nature.

Hereinafter, the method of the present invention will be explained using the drawings.

In FIG. 1(a), 1 indicates the first layer intermediate welding material, and 2
is the second layer intermediate welding material. The first intermediate intermediate joint material in the present invention requires heavy metal, which is a highly malleable metal without forming any brittle intermetallic compounds with titanium. Through research conducted by the inventors of the present application, it has been found that industrially pure niobium, niobium alloys such as Nb-IZr and Nb-Ti, industrially pure tantalum, or tantalum alloys are preferable as the first layer intermediate material. The second layer intermediate bonding material is required to be a highly malleable metal without forming any brittle intermetallic compounds between it and the first layer intermediate bonding material and between it and the steel. Second
Industrial pure copper, industrial pure nickel, copper alloys, and nickel alloys are preferable as interlayer bonding materials.

The first layer intermediate medium bonding material and the second layer intermediate medium bonding material are joined by reverse bonding by a conventionally known method for joining dissimilar metals, such as an explosion bonding method or a diffusion bonding method. Figure 1(b) 3 shows the jointed cranio-nod plates.

By fully rolling this clad plate, as shown in Fig. 1 (c) 4
A thin clad plate shown in is obtained. 1' indicates the first layer intermediate welding material after rolling, and 2' indicates the second layer intermediate welding material after rolling. The rolling may be either hot rolling or cold rolling depending on the combination of the first layer welding material and the second layer welding material. The rolling is preferably carried out within the range of IK from 1/5 to 50 minutes of the total plate thickness in 3 in FIG. 1(b). After rolling, any suitable heat treatment may be carried out.

The thin clad plate 4 thus obtained is shown in FIG.
As shown in d), the first layer intermediate bonding material 1' is placed on the composite material 5 side, and the second layer is placed on the composite material 5 side.
Insert the layer welding material 2' so that it is on the base material 6 side, and as shown in Figure 1 (
Join as shown in e).

7 in FIG. 1(e) shows the joined clad steel.

The composite material 5 is an industrial pure titanium plate or Ti-0,5P
It is a titanium alloy with a base material of 6, SS material (rolled steel material for membrane structure), SB material (rolled steel material for boiler), SM material (
These are rolled steel materials for welded structures), SUS materials (stainless steel materials), and steel materials similar to these materials. These joining methods include conventionally known methods for joining dissimilar metals, such as explosive bonding, diffusion bonding, and roll pressure bonding.

In the case of joining using the explosive crimping method, there is also a method in which the thin clad plate 4 is completely bonded to the base material 6, and then the composite material 5 is bonded to the base material 6, but as described above, the thin clad plate 4 and the composite material It is more efficient to explosively bond 5 to the base material 6 at the same time.

The same applies to the diffusion bonding method.

When forming the clad steel 7 into a clad steel plate 8 having a predetermined thickness as shown in FIG. 1(f), depending on the rolling temperature and the rolling capacity of the rolling mill, Rolling is performed within a range that reduces the thickness to 1/50th. 4' in Figure 1(f)
5' indicates the thin clad plate after rolling, 5' indicates the composite material, and 6' indicates the base material.

In the case of hot rolling, it is also possible to repeat heating and rolling a total number of times. Furthermore, it is also effective to perform intermediate annealing.

Furthermore, when using the roll pressure welding method, when rolling the clad steel 7, it is also possible to use a method in which the composite material, the thin clad plate 4, and the base metal 6 are joined by rolling and manufactured to a predetermined thickness. be. Also, after creating the thin clad plate 4,
It is also possible to join the base material 6 by a roll pressure welding method and further join the composite material 5.

In order to control the thickness of the intermediate welding material 1" in the clad steel plate 8 from several microns to several hundreds of microns, the thickness of the intermediate welding material 1" and 2" in FIG. , 4 when rolling into thin clad plates, and Figure 1 (e
) to (f) must be sufficiently considered.

- Hereinafter, embodiments of the present invention will be described.

Example 1 A commercially available industrial pure niobium plate and an oxygen-free copper plate were bonded together by the explosive pressure bonding method to form a (2+1.2)tn' x 100mm.
A clad board with w x 200 mm was created. This clad plate was rolled by cold rolling to (0,5+3.0)
A thin clad plate measuring 250 mm x 4.00 mm was used.

This thin clad plate is commercially available SB 42 steel plate 50+++
m x 250 + n + n x 400 mm, an oxygen-free copper plate was explosively crimped so that the chain side was on, and a commercially available titanium plate 5 mm x 250 mm was placed on top of the niobium plate.
X400tmn By fully explosive crimping, 4 layers of Chita 7 Furano)' Steel (5+0.5+3.0+50)+
mntX250+n+n×400 theory was obtained.

After heating this titanium clad steel '1r830'c for 1 hour,
Roll the plate so that the thickness becomes one-fifth, (100.1+0
．． 6+10) A titanium clad steel plate with 400 recitations x 1250 mornings was created.

As a result of a full investigation of the bonding strength of the titanium clad steel plates created in this way, it was found that even after rolling, the bonding strength was 625°C
Even after heat treatment of I Hr F, C, J
It was confirmed that it had a shear value of 14] (7/ma or more, which is the IS standard value), and that it had excellent bending workability.

Example 2 A commercially available industrially pure niobium plate and an industrially pure nickel plate were joined by an explosive crimping method, and (2+12)mmtXloomm
All cladding plates of X200+nn+ were made.

Conocrat plate i cutting L te(2+12)mmtXlo
ommO, both cut pieces/niobium surfaces were put together, outer periphery welded to make one body, heated at 900°C for 1 hour, rolled to 1/4 of the plate thickness, separated and (0.5+3.0)mmtXl
Two thin clad plates measuring oomm x 400mm were prepared. This thin clad plate is commercially available S B 4.2
On top of the steel plate 50++o++X 100 rice x 400 brains, nickel was explosively crimped so that the chain side was on the side, and then on top of that plate was a commercially available titanium plate 5tnmt x 100mm x
4 layers of titanium clad steel (5+0.5+3.0+50)+n+n by 500mmK explosive crimping
A size of 100mm x 400mm was obtained.

After heating this titanium clad steel at 830°C for 1 hour, it was rolled to one-fifth the plate thickness (1+0.1+0.6+10).
A titanium clad steel plate measuring m+n x 400 mm x 500 mm was created.

As a result of investigating the bonding strength of the titanium clad steel sheets created in this way, it was found that even after rolling, the bonding strength was 625°C
Even after heat treatment of I Hr F, C, JIS
It has a shear value of 1'4 kf/- or more, which is the standard value,
It was confirmed that the bending workability was also excellent.

Example 3 Commercially available industrial pure tantalum plate 2mmtX 100mm
and an oxygen-free copper plate 1010 mm x 100 were joined by diffusion bonding under a vacuum atmosphere (10' Torr) at a heating temperature of 700 to 1100°C, a pressing force of 0.1 kg and 7 mA or more, and a pressing time of 10 minutes or more. This clad plate was cold-rolled to a quarter of the plate thickness, and (0,5+2.5) in
A thin clad plate measuring XL, 00 mm x 400 mm was used. This thin clad plate is commercially available SM41B steel plate 50
An oxygen-free copper plate was explosively crimped onto the tantalum plate so that the chain side was on the +nm'
0mm fBy diffusion bonding under the same conditions as above,
4 layers of titanium clad steel (5+0.5+2.5+50
) mm” x 100 holes x 400 holes were obtained.

After heating this titanium clad steel at 830℃ for 1 hour, the plate thickness was 5
Rolled to 1/2, (1+0.1+0.5+10) x4
A titanium clad steel plate measuring 00 mm x 500 mm was created.

As a result of investigating the bonding strength of the titanium clad steel plates created in this way, it was found that even after rolling, the bonding strength was 625°C
l Even after heat treatment of Hr F, C-, JIS
It has a shear value of 14 kf/mA or more, which is the standard value,
It was confirmed that it has excellent bending workability.

Example 4 A commercially available industrial pure tantalum plate 2 mm x 100 mm and a nickel plate 10 mm t x 100 mm were joined by explosive crimping to form a (2+10)m+n' x 100
Two clad plates with layer m were prepared. After aligning the tantalum surfaces of these clad plates and welding the outer circumference,
After heating at 900°C for 1 hour, the plate was rolled to a quarter of the thickness and (0,
5+2.5) A combination board of thin clad plates of 100 x 400 x 1 centimeter was created. Furthermore, on the amphoteric surface of the laminated plate of this thin clad plate,
Commercially available 5B42 steel plate 5o-X100mm X400mm
After installing two sheets and welding the outer periphery, the sheets were heated at 900° C. for 1 hour, and then rolled to half the sheet thickness to perform roll pressure welding of the nickel and 5B42 steel sheets. After rolling, the outer welded part was removed, (0.25+1.75+25
)+nm'
Explosively crimp 5 tons x 200 tons x 400 tons, (2,
5 + 0.25 + 1.75 + 25) Throat x 200 x 4
00w++ titanium clad steel was obtained.

After heating this titanium clad steel at 830℃ for 1 hour, the plate thickness was 2
．． It was rolled to one-fifth size to produce a titanium clad steel plate measuring (1+0.1+0.7+10)×400×500.

As a result of investigating the bonding strength of the titanium clad steel sheets created in this way, it was found that even after rolling, the bonding strength was 625°C
Even after heat treatment at 1-Hr F, C, JI
It was confirmed that the shear value was greater than the S standard value of 1.41<y/-, and that it had excellent bending workability.

[Brief explanation of the drawing]

FIGS. 1(a) to 1(f) are detailed explanatory diagrams of the present invention. 1. 1', 1"...First layer intermediate welding material 2.2', 2"
...Second layer intermediate welding material 3...Clad plate 4,4
' Thin clad plate 5.5', composite material 6,6', base material 7... clad steel 8... clad steel plate patent applicant Asahi Kasei Corporation representative patent attorney Takeshi Komatsu 1 1

Claims (1)

[Claims] Titanium/or titanium alloy is used as the composite material, any one of niobium, niobium alloy, tantalum, or tantalum alloy is used as the first layer intermediate bonding material, and any one of copper, copper alloy, nickel, or nickel alloy is used as the first layer intermediate bonding material. When producing a titanium crand steel sheet with a two-layer intermediate medium welding material and steel as the base material, the first layer intermediate medium welding material and the second layer intermediate medium welding material are joined and rolled to form a thin plate, and then the A method for producing a titanium clad steel sheet, which comprises joining and rolling the thin plates so that the first layer intermediate welding material is on the composite material side and the second layer intermediate welding material is on the base metal side.