CN105080997A - Method for manufacturing titanium steel composite board without interlayer - Google Patents

Abstract

The invention belongs to the field of preparation and processing of a titanium-steel composite plate, and relates to a method for manufacturing a titanium-steel composite plate without an intermediate layer. The invention provides a method for preparing a titanium-steel composite plate without an intermediate layer. The method comprises the following steps: a. treating the surface of the steel plate or billet and the surface of the titanium plate to remove surface dirt and oxide layer; b. using The symmetrical billet method is to carry out symmetrical grouping of the steel plate or steel billet and the titanium plate according to the order of the steel plate or steel billet-titanium plate-steel plate or steel billet to form a combined billet; c, the combined billet is welded around the billet by welding in a vacuum environment; d. Heat the combined billet to 960-1000°C for 120-360 minutes; e. Hot-roll the heated billet, control the starting rolling temperature above 910°C, finish rolling temperature not lower than 800°C, and control single-pass deformation The amount is between 15% and 20%, and the total rolling deformation is ≥90%; after hot rolling, cool to room temperature. The titanium-steel composite plate obtained by the method has high bonding strength.

Description

A kind of preparation method of titanium-steel composite plate without intermediate layer

technical field

The invention belongs to the field of preparation and processing of titanium-steel composite plates, and relates to a manufacturing method of titanium-steel composite plates.

Background technique

Titanium has good physical, chemical and mechanical properties, but its smelting technology is complicated and the production cost is high, so the price of titanium is very expensive, which greatly limits the promotion and application of titanium. Combining titanium with other metals (such as steel, copper, aluminum, etc.) -Steel composite materials are widely used in chemical, petroleum and other industrial sectors because of their high strength, excellent corrosion resistance and significant economic benefits.

The production of titanium-steel clad plates by direct rolling is the current development trend. Compared with the traditional explosive cladding and explosive-rolling methods, it has the advantages of flexible product size and specification, stable performance, and easy mechanization and automation. However, due to the small solid solubility of titanium and iron, direct contact with steel will form a brittle phase on the interface, so people usually use the method of adding a thin intermediate layer to solve the problem. Commonly used intermediate layers include nickel, copper, etc. However, when these thin-layer metals are used, when the rolling deformation is large, due to the different deformation resistance of each layer, fractures are prone to occur, resulting in unstable bonding strength.

Contents of the invention

In view of the above defects, the present invention provides a method for preparing a titanium-steel clad plate without an intermediate layer. The direct rolling method is used to produce a titanium-steel clad plate without adding an intermediate layer. By adopting a higher final rolling temperature, the interfacial compound The possibility of generating micro-holes after crushing is reduced, so that the negative impact of the holes on the interface on the bonding performance is minimized, and a titanium-steel composite plate with excellent performance is obtained; the bonding strength of the titanium-steel composite plate obtained by this method is high.

Technical scheme of the present invention:

The invention provides a method for preparing a titanium-steel composite plate without an intermediate layer, the method comprising the following steps:

a. Treat the surface of the steel plate or billet and the surface of the titanium plate to remove surface dirt and oxide layer;

b. The steel plate or steel billet and the titanium plate are carried out symmetrically in the order of steel plate or steel billet-titanium plate-steel plate or steel billet to form a combined billet by using the symmetrical billet method;

c. The combined blank is welded around the blank by welding in a vacuum environment;

d. Heat the combined blank to 960-1000°C for 120-360 minutes;

e. The heated billet is hot-rolled, the starting rolling temperature is controlled above 9210°C, the final rolling temperature is not lower than 800°C, and the deformation of a single pass is controlled at 15% to 20%, and the total rolling deformation is ≥90% ; Cool to room temperature after hot rolling.

Preferably, in step d, the combined blank is heated to 980-1000°C.

Further, the carbon content of the steel plate or billet is ≤0.1%, the steel plate is a plain carbon steel plate, and the titanium plate is an industrial pure titanium plate (TA1 or TA2).

Preferably, in step a, the surface treatment adopts at least one method among sandblasting, pickling, mechanical processing and cleaning.

Further, the composite blank is composed of two steel plates or billets and a titanium plate placed between them.

Preferably, in step c, the vacuum degree is less than or equal to 1×10 ^-2 Pa, and the vacuum electron beam welding method is used to evacuate and perform welding treatment.

In step e, the hot rolling is implemented by using a hot tandem rolling mill, or a medium and thick plate rolling mill.

A titanium-steel composite plate, which is produced by the above method, does not contain a transition layer between the steel plate or billet of the titanium-steel composite plate and the titanium plate; that is, no intermediate layer is added.

Further, the bonding strength of the titanium-steel clad plate is >240MPa, preferably 250-280MPa.

Beneficial effects of the present invention:

The titanium-steel clad plate obtained after rolling in the invention has a good bonding effect, and the bonding strength is >240MPa, which is higher than the bonding strength of the same kind of titanium-steel clad plate in the national standard.

Detailed ways

Process scheme of the present invention is as follows:

①Plain carbon steel is used for the base plate (the carbon content is preferably below 0.1%), and commercial pure titanium (TA1 or TA2) is used for the double plate; the surface of the base plate and double plate is ground and polished to remove surface dirt and oxide layer;

②According to the order of steel plate/titanium plate/steel plate, carry out symmetrical blank assembly, and then weld the blanks around in vacuum, and the vacuum degree reaches below 1×10 ^-2 Pa;

③Heating the combined billets to 960-1000°C for a heating time of 120-360 minutes.

④ Take out the above-mentioned heated billet for rolling, the total rolling deformation is ≥90%, and the single-pass deformation is controlled at about 15-20%; the final rolling temperature is not lower than 800°C; then cool to room temperature.

The purpose of the present invention is to use the direct rolling method to produce titanium-steel clad plates without adding an intermediate layer, and to minimize the negative impact of interface brittleness on bonding performance through process control to obtain titanium-steel clad plates with excellent performance.

The titanium-steel clad plate obtained after rolling in the invention has a good bonding effect, and the bonding strength is >240MPa, which is higher than the bonding strength of the same kind of titanium-steel clad plate in the national standard.

The specific implementation of the present invention will be further described below in conjunction with the examples, and the present invention is not limited to the scope of the examples.

Example 1

①Process two steel plates with dimensions of 200×160×18mm and one titanium plate with dimensions of 160×120×20mm. Grind and polish the surface to remove surface dirt and oxide layer, and then process according to steel plate/titanium plate/steel plate Carry out symmetrical billet assembly in the same order, and weld the billets around in the vacuum chamber, and the vacuum degree is <10 ^-2 Pa;

②Put the prepared billet into the heating furnace and heat it to 990°C and keep it warm for 180min;

③ Take out the billet after heating and roll it. The deformation of each pass is about 15%. After 13 passes of rolling, the cumulative deformation is 89%.

④ Sampling for bond strength test, interface bond strength 260MPa; bond strength test according to GB/T8547-2006.

Example 2

①Process two steel plates with dimensions of 200×160×18mm and one titanium plate with dimensions of 160×120×20mm. Grind and polish the surface to remove surface dirt and oxide layer, and then process according to steel plate/titanium plate/steel plate Carry out symmetrical billet assembly in the same order, and weld the billets around in the vacuum chamber, and the vacuum degree is <10 ^-2 Pa;

②Put the prepared billet into the heating furnace and heat it to 970°C and keep it warm for 240min;

③ Take out the billet after heating and roll it. The deformation of each pass is about 20%. After 10 passes of rolling, the cumulative deformation is 90%.

④ Sampling for bond strength test, interface bond strength 255MPa; bond strength test according to GB/T8547-2006.

Example 3

①Process two steel plates with dimensions of 200×160×18mm and one titanium plate with dimensions of 160×120×20mm. Grind and polish the surface to remove surface dirt and oxide layer, and then process according to steel plate/titanium plate/steel plate Carry out symmetrical billet assembly in the same order, and weld the billets around in the vacuum chamber, and the vacuum degree is <10 ^-2 Pa;

②Put the prepared billet into the heating furnace and heat it to 960°C and keep it warm for 240min;

③Take out the billet after heating and roll it. The deformation of each pass is about 20%. After 11 passes of rolling, the cumulative deformation is 91%.

④ Sampling for bond strength test, interface bond strength 280MPa; bond strength test according to GB/T8547-2006.

Comparative example 1

Adopt the same titanium plate and steel plate as in Example 1, just adopt 820-950 ℃ in the heating temperature in step 2, step 3. in the pass deformation amount about 10%, through 12 passes rolling, accumulative deformation amount 85%, The final rolling temperature is 740°C, water cooling to 680°C and then air cooling; other process operations are the same as those in the examples; the bonding strength is tested according to GB/T8547-2006, and the interface bonding strength is <200MPa.

It can be seen that the present invention finds through creative exploration that suitable factors such as heating temperature, deformation amount, and final rolling temperature cooperate with each other, so that the titanium-steel clad plate without the intermediate layer can also achieve high interface strength (greater than 240MPa), and because there is no Including the middle layer, on the one hand, it can simplify the process, and on the other hand, it also greatly reduces the production cost.

Claims (9)

1. the preparation method of no intermediate layer titanium-steel clad plate, is characterized in that, described method comprises the following steps: a. Treat the surface of the steel plate or billet and the surface of the titanium plate to remove surface dirt and oxide layer; b. The steel plate or steel billet and the titanium plate are carried out symmetrically in the order of steel plate or steel billet-titanium plate-steel plate or steel billet to form a combined billet by using the symmetrical billet method; c. The combined blank is welded around the blank by welding in a vacuum environment; d. Heat the combined blank to 960-1000°C for 120-360 minutes; e. The heated billet is hot-rolled, the starting rolling temperature is controlled above 910°C, the final rolling temperature is not lower than 800°C, and the deformation of each pass is controlled at 15% to 20%, and the total rolling deformation is ≥90% ; Cool to room temperature after hot rolling. 2. The method for preparing a titanium-steel clad plate without an intermediate layer according to claim 1, characterized in that, in step d, the combined blank is heated to 980-1000°C. 3. The method for preparing a titanium-steel composite plate without an intermediate layer according to claim 1 or 2, wherein the carbon content of the steel plate or steel slab is ≤0.1%, and the titanium plate is an industrially pure titanium plate. 4. The method for preparing a titanium-steel composite plate without an intermediate layer according to any one of claims 1 to 3, characterized in that, in step a, the surface treatment adopts at least one of sandblasting, pickling, machining and cleaning way. 5. The method for preparing a titanium-steel composite plate without an intermediate layer according to any one of claims 1 to 4, characterized in that, in step b, the combined blank consists of two steel plates or steel billets and a steel plate placed between them Consists of a titanium plate. 6. The method for preparing a titanium-steel composite plate without an intermediate layer according to any one of claims 1 to 5, characterized in that, in step c, the vacuum degree is ≤ 1×10 ^-2 Pa, and the vacuum electron beam welding method is used to vacuum Vacuum and welded. 7. A titanium-steel clad plate, which is produced by the method according to any one of claims 1-6. 8. The titanium-steel clad plate according to claim 7, characterized in that there is no intermediate layer between the steel plate or billet of the titanium-steel clad plate and the titanium plate, and the bonding strength of the titanium-steel clad plate is >240MPa. 9. The titanium-steel clad plate according to claim 8, characterized in that the bonding strength of the titanium-steel clad plate is 250-280 MPa.