Production process of TC4 titanium alloy cold-rolled strip coil

Abstract

The invention discloses a production technology of a TC4 titanium alloy cold-rolled strip coil. The production technology comprises the following steps that S1, a TC4 titanium plate blank is subjected to hot rolling under the condition that the temperature is lower than the phase transformation point temperature, and a hot-rolled coil is obtained; s2, annealing the hot-rolled coil to obtain a uniform structure; s3, shot blasting, alkali explosion and acid pickling are conducted on the hot-rolled coil to remove a surface oxide layer and an oxygen-enriched layer; s4, cold rolling is conducted, specifically, the hot-rolled coil is cold-rolled into a cold-rolled strip coil with the thickness of 0.2-2.5 mm under different annealing temperature conditions for one to five times; s5, the cold-rolled strip coil is degreased to remove oil stains on the surface, and a clean surface is obtained; and S6, the cold-rolled strip coil is subjected to recrystallization annealing, and the finished cold-rolled strip coil is obtained. Compared with the prior art, the problem that the TC4 titanium alloy rolling efficiency is low can be solved.

Description

Technical Field

[0001] The invention belongs to the technical field of alloy material processing, and in particular relates to a production process of a TC4 titanium alloy cold-rolled strip coil. Background Art

[0002] Titanium alloys can be classified according to their organization or performance. The classic method is to classify titanium alloys into α-type, α+β-type and β-type according to the organizational characteristics after annealing. With the improvement of the alloying degree of titanium, various countries have successively developed some new titanium alloys with excellent performance. The classic classification method can no longer meet the actual needs, so titanium alloys are more finely classified into α-type, near-α-type, α+β-type, near-metastable β-type and metastable β-type according to the metastable phase composition.

[0003] TC4 titanium alloy is the most widely used titanium alloy. Due to its high strength and low plasticity, the plate production adopts sheet rolling. Sheet rolling has the advantages of flexible process and reversible rolling, but its inherent disadvantages are low rolling efficiency and low yield rate. Summary of the invention

[0004] The purpose of the present invention is to solve the problem of low rolling efficiency of TC4 titanium alloy and to provide a production process of TC4 titanium alloy cold-rolled strip coil.

[0005] In order to achieve the above object, the present invention provides a production process of TC4 titanium alloy cold-rolled strip coil, which comprises the following steps:

[0006] S1: TC4 titanium slab is hot rolled to obtain hot rolled coil under the condition of temperature below the phase transition point;

[0007] S2: hot rolled coil is annealed to obtain a uniform structure;

[0008] S3: Shot blasting, alkali blasting and pickling are performed on the hot rolled coil to remove the surface oxide layer and oxygen-rich layer;

[0009] S4: cold rolling, cold rolling the hot rolled coil into a cold rolled strip coil with a thickness of 0.2-2.5 mm under one to five different annealing temperature conditions;

[0010] S5: The cold rolled coil is degreased to remove surface oil stains to obtain a clean surface;

[0011] S6: The cold-rolled coil is subjected to recrystallization annealing to obtain a finished cold-rolled coil.

[0012] As a further description of the above technical solution:

[0013] The step S1 hot rolling comprises the following steps:

[0014] Hot rolling, at an initial rolling temperature of 960-990°C and a final rolling temperature of 850°C, multiple hot rolling passes are performed to obtain a hot rolled coil;

[0015] The hot rolled coil is annealed at a temperature of 800-850°C for 30-60 minutes and then air-cooled;

[0016] The hot rolled annealed coil is shot blasted or alkali blasted and pickled to remove the surface oxide layer and oxygen-rich layer to obtain a hot rolled coil with a clean surface.

[0017] As a further description of the above technical solution:

[0018] The total deformation amount of the hot rolling is greater than 95%.

[0019] As a further description of the above technical solution:

[0020] In step S2, an annealing furnace is used for annealing heat treatment, the annealing temperature is 800-850° C., and the insulation time is 30-60 minutes.

[0021] As a further description of the above technical solution:

[0022] In step S4, the deformation amount of the first rolling process is less than 20%, and the deformation amount of the remaining rolling processes is less than 30%.

[0023] As a further description of the above technical solution:

[0024] In the step S4, the cumulative deformation amount of the cold rolling treatment is ≥45%.

[0025] As a further description of the above technical solution:

[0026] The recrystallization annealing in step S6 is performed in a horizontal argon-protected continuous annealing furnace at a temperature of 800-910° C. and an annealing speed of 3-6 m / min.

[0027] In summary, due to the adoption of the above technical scheme, the beneficial effects of the present invention are: overcoming the shortcomings of TC4 titanium alloy sheet rolling, realizing the supply of TC4 titanium alloy cold-rolled plates in coils, with high processing efficiency and high yield rate, and meeting the market demand for TC4 cold-rolled strips. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0029] Figure 1 The figure is a flow chart of a production process of a TC4 titanium alloy cold-rolled coil. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0031] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] Implementation 1:

[0033] See also Figure 1 The present invention provides a production process of a TC4 titanium alloy cold-rolled strip coil, comprising the following steps:

[0034] S1: TC4 titanium slab is hot rolled to obtain hot rolled coil under the condition of temperature below the phase transition point;

[0035] S2: hot rolled coil is annealed to obtain a uniform structure;

[0036] S3: Shot blasting, alkali blasting and pickling are performed on the hot rolled coil to remove the surface oxide layer and oxygen-rich layer;

[0037] S4: cold rolling, cold rolling the hot rolled coil into a cold rolled strip coil with a thickness of 0.2-2.5 mm under one to five different annealing temperature conditions;

[0038] S5: The cold rolled coil is degreased to remove surface oil stains to obtain a clean surface;

[0039] S6: The cold-rolled coil is subjected to recrystallization annealing to obtain a finished cold-rolled coil.

[0040] The step S1 hot rolling comprises the following steps:

[0041] Hot rolling, at an initial rolling temperature of 960-990°C and a final rolling temperature of 850°C, multiple hot rolling passes are performed to obtain a hot rolled coil;

[0042] The hot rolled coil is annealed at a temperature of 800-850°C for 30-60 minutes and then air-cooled;

[0043] The hot rolled annealed coil is shot blasted or alkali blasted and pickled to remove the surface oxide layer and oxygen-rich layer to obtain a hot rolled coil with a clean surface.

[0044] The total deformation amount of the hot rolling is greater than 95%.

[0045] In step S2, an annealing furnace is used for annealing heat treatment, the annealing temperature is 800-850° C., and the insulation time is 30-60 minutes.

[0046] In step S4, the deformation amount of the first rolling process is less than 20%, and the deformation amount of the remaining rolling processes is less than 30%.

[0047] In the step S4, the cumulative deformation amount of the cold rolling treatment is ≥45%.

[0048] The recrystallization annealing in step S6 is performed in a horizontal argon-protected continuous annealing furnace at a temperature of 800-910° C. and an annealing speed of 3-6 m / min.

[0049] The average grain size of the TC4 titanium alloy cold-rolled coil is 3-8μm, the room temperature tensile strength can reach room temperature tensile strength ≥900MPa, the yield strength ≥840MPa, and the elongation A 50m ≥12%, smooth and uniform surface, no slight mechanical lines, and the thickness deviation of the coil is no more than ±0.01mm.

[0050] Implementation 2:

[0051] The present invention provides a production process of a TC4 titanium alloy cold-rolled strip coil, comprising the following steps:

[0052] S1: TC4 titanium slab is hot rolled to obtain hot rolled coil under the condition of temperature below the phase transition point;

[0053] S2: hot rolled coil is annealed to obtain a uniform structure;

[0054] S3: cold rolling, cold rolling the hot rolled coil into a cold rolled strip coil with a thickness of 0.2-2.5 mm under one to five different annealing temperature conditions;

[0055] S4: The cold rolled coil is degreased to remove surface oil stains to obtain a clean surface;

[0056] S5: The cold-rolled coil is subjected to recrystallization annealing to obtain a finished cold-rolled coil.

[0057] Embodiment 2 provides a production process of TC4 titanium alloy cold-rolled coil, which is basically the same as Embodiment 1, except that the hot-rolled coil is not subjected to shot blasting, alkali blasting, or pickling to remove the surface oxide layer and oxygen-rich layer.

[0058] The TC4 titanium alloy cold-rolled coil obtained in Example 2 has an average grain size of 3-8 μm, a room temperature tensile strength of ≥900 MPa, a yield strength of ≥840 MPa, an elongation of ≥9%, and a coil thickness deviation of no more than ±0.014 mm. The surface polishing of the TC4 titanium alloy cold-rolled coil is poorly uniform, with slight mechanical textures.

[0059] Therefore, the present invention provides a production process for TC4 titanium alloy cold-rolled strip coils, which overcomes the disadvantages of TC4 titanium alloy sheet rolling, realizes the supply of TC4 titanium alloy cold-rolled plates in coils, has high processing efficiency and high yield rate, meets the market demand for TC4 cold-rolled strips, and has performance requirements, with tensile strength ≥900MPa, yield strength ≥840MPa, and elongation A 50mm ≥9%, the surface is evenly polished without slight mechanical lines.

[0060] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A production process for TC4 titanium alloy cold-rolled strip coil, characterized in that: The following steps are involved: S1: Tc4 titanium slab is hot rolled to obtain hot rolled coil under the condition of temperature below the phase transition point; S2: hot rolled coil is annealed to obtain a uniform structure; S3: Shot blasting, alkali blasting and pickling are performed on the hot rolled coil to remove the surface oxide layer and oxygen-rich layer; S4: cold rolling, cold rolling the hot rolled coil into a cold rolled strip coil with a thickness of 0.2-2.5 mm under one to five different annealing temperature conditions; S5: The cold rolled coil is degreased to remove surface oil stains to obtain a clean surface; S6: The cold-rolled coil is subjected to recrystallization annealing to obtain a finished cold-rolled coil.

2. The production process of a TC4 titanium alloy cold-rolled coil according to claim 1, characterized in that: The step S1 hot rolling comprises the following steps: Hot rolling, at an initial rolling temperature of 960-990°C and a final rolling temperature of 850°C, multiple hot rolling passes are performed to obtain a hot rolled coil; The hot rolled coil is annealed at a temperature of 800-850°C for 30-60 minutes and then air-cooled; The hot rolled annealed coil is shot blasted or alkali blasted and pickled to remove the surface oxide layer and oxygen-rich layer to obtain a hot rolled coil with a clean surface.

3. The production process of a TC4 titanium alloy cold-rolled coil according to claim 2, characterized in that: The total deformation amount of the hot rolling is greater than 95%.

4. The production process of a TC4 titanium alloy cold-rolled coil according to claim 1, characterized in that: In step S2, an annealing furnace is used for annealing heat treatment, the annealing temperature is 800-850° C., and the insulation time is 30-60 minutes.

5. The production process of a TC4 titanium alloy cold-rolled coil according to claim 1, characterized in that: In step S4, the deformation amount of the first rolling process is less than 20%, and the deformation amount of the remaining rolling processes is less than 30%.

6. The production process of a TC4 titanium alloy cold-rolled coil according to claim 1, characterized in that: In the step S4, the cumulative deformation amount of the cold rolling treatment is ≥45%.

7. The production process of a TC4 titanium alloy cold-rolled coil according to claim 1, characterized in that: The recrystallization annealing in step S6 is performed by heat treatment in a horizontal argon-protected continuous annealing furnace, the heat treatment temperature is 800-910° C., and the annealing speed is 3-6 m / min.

Images