A method for preparing ta2 hot-rolled pure titanium plate based on oxygen equivalent annealing process

Abstract

A method for preparing TA2 hot-rolled pure titanium plates based on an oxygen equivalent annealing process, the specific steps are as follows: select titanium sponge, titanium dioxide, titanium sheets, titanium chips and titanium tubes, titanium sheets, titanium chips and titanium tubes by shearing, After sorting and pickling treatment, it is mixed with sponge titanium and titanium dioxide, smelted into a slab in an electron beam cooling furnace, and the surface of the slab is milled, partially ground, chamfered and sawed to obtain a TA2 slab. Hot-rolled into titanium coils and cut into flats or sheet-rolled into TA2 plates; then atmospheric annealed in a roller hearth furnace, and then subjected to sandblasting, sandblasting pickling, alkali pickling or shot blasting pickling after being out of the furnace for correction One of them is processed, and the local defects on the surface are repaired to obtain a TA2 titanium plate. The present invention selects the standard of annealing process for slab oxygen equivalent and rolling mode, and then selects annealing temperature, obtains TA2 plates with qualified mechanical properties and uniform structure, improves the pass rate of TA2 titanium plates, and has low production cost and high production efficiency.

Description

technical field

[0001] The invention belongs to the technical field of material processing, and in particular relates to a method for preparing a TA2 hot-rolled pure titanium plate based on an oxygen equivalent annealing process. Background technique

[0002] TA2 industrial pure titanium has the advantages of low density, high plasticity and corrosion resistance, and is widely used in petrochemical, shipbuilding, seawater desalination and other fields. At present, most domestic titanium enterprises still use vacuum consumable arc melting (VAR) and forging to produce pure titanium slabs, and few manufacturers use electron beam cold hearth furnace melting (EBCHM) to prepare pure titanium slabs. This method is different from traditional vacuum Consumable arc smelting is different, there is no need to press the welding electrode, and various forms of scraps such as strips, chips, and plates can be used in large quantities. The maximum addition ratio can reach 100%, which greatly...

Examples

preparation example Construction

[0031] A kind of TA2 hot-rolled pure titanium plate preparation method based on oxygen equivalent annealing process, concrete steps are as follows:

[0032] Step 1. Select titanium sponge, titanium dioxide, titanium sheets, titanium chips and titanium tubes. After the titanium sheets, titanium chips and titanium tubes are cut, sorted and pickled, they are mixed with sponge titanium and titanium dioxide, and subjected to electron beam cooling. The slab is smelted into a slab at one time in a bed furnace. After milling, local grinding, chamfering and sawing on the surface of the smelted slab, a TA2 slab with a thickness of 180-350mm is prepared. The impurity elements of the TA2 slab are respectively For weight percentage Fe≤0.1%, C≤0.05%, N≤0.02%, H≤0.01%, O0.08%~0.20%;

[0033] Step 2. The TA2 slab in step 1 is heated and rolled into titanium coils and split into plates, or rolled into TA2 plates. The sheet rolling is sheet unidirectional rolling or sheet rolling. reverse roll...

Embodiment 1

[0045] A method for preparing a TA2 hot-rolled pure titanium plate based on an oxygen equivalent annealing process, the specific preparation steps are as follows:

[0046] Step 1. Select grade 0 sponge titanium, 14% TA1 titanium chips, and 8 boxes of TA1 thin titanium sheets to mix. The titanium chips and titanium sheets are processed by shearing, sorting and pickling. After the surface of the smelted slab is milled, partially ground, chamfered and sawed, a TA2 slab with a thickness of 192mm is prepared. The content of impurity elements in the TA2 slab is Fe0.025%, C 0.012%, N 0.0061%, H≤0.001% and O 0.094%;

[0047] Step 2: Heating the prepared TA2 slabs to 890°C and 790°C respectively, and rolling them into TA2 plates with a thickness of 14mm according to the secondary fire of 192mm→30mm→14mm;

[0048]Step 3. Atmospheric annealing of the 14 mm TA2 plate in step 2 in a roller hearth furnace, the oxygen equivalent is 0.131%, the annealing temperature is 580 ° C, the holding t...

Embodiment 2

[0051] A method for preparing a TA2 hot-rolled pure titanium plate based on an oxygen equivalent annealing process, the specific preparation steps are as follows:

[0052] Step 1: Select TA1-FH titanium sheet material, TA2 titanium chip briquette, TA1-FH titanium sheet material and TA3 titanium chip briquette to mix, titanium chips and titanium sheet material are processed by shearing, sorting and pickling, use Electron beam cold bed furnace smelts once, after milling, local grinding, chamfering and sawing on the surface of the smelted slab, a TA2 slab with a thickness of 210mm is prepared, and the content of impurity elements in the TA2 slab is % by weight Fe 0.039%, C 0.017%, N 0.012%, H≤0.001% and O 0.113%;

[0053] Step 2: Heating the prepared TA2 slabs to 850°C and 750°C respectively, and rolling them into TA2 plates with a thickness of 12mm according to the secondary fire of 210mm→40mm→12mm;

[0054] Step 3. Atmospheric annealing of the 12mm finished plate in step 2 in ...

technical field

[0001] The invention belongs to the technical field of material processing, and in particular relates to a method for preparing a TA2 hot-rolled pure titanium plate based on an oxygen equivalent annealing process. Background technique

[0002] TA2 industrial pure titanium has the advantages of low density, high plasticity and corrosion resistance, and is widely used in petrochemical, shipbuilding, seawater desalination and other fields. At present, most domestic titanium enterprises still use vacuum consumable arc melting (VAR) and forging to produce pure titanium slabs, and few manufacturers use electron beam cold hearth furnace melting (EBCHM) to prepare pure titanium slabs. This method is different from traditional vacuum Consumable arc smelting is different, there is no need to press the welding electrode, and various forms of scraps such as strips, chips, and plates can be used in large quantities. The maximum addition ratio can reach 100%, which greatly...

Examples

preparation example Construction

[0031] A kind of TA2 hot-rolled pure titanium plate preparation method based on oxygen equivalent annealing process, concrete steps are as follows:

[0032] Step 1. Select titanium sponge, titanium dioxide, titanium sheets, titanium chips and titanium tubes. After the titanium sheets, titanium chips and titanium tubes are cut, sorted and pickled, they are mixed with sponge titanium and titanium dioxide, and subjected to electron beam cooling. The slab is smelted into a slab at one time in a bed furnace. After milling, local grinding, chamfering and sawing on the surface of the smelted slab, a TA2 slab with a thickness of 180-350mm is prepared. The impurity elements of the TA2 slab are respectively For weight percentage Fe≤0.1%, C≤0.05%, N≤0.02%, H≤0.01%, O0.08%~0.20%;

[0033] Step 2. The TA2 slab in step 1 is heated and rolled into titanium coils and split into plates, or rolled into TA2 plates. The sheet rolling is sheet unidirectional rolling or sheet rolling. reverse roll...

Embodiment 1

[0045] A method for preparing a TA2 hot-rolled pure titanium plate based on an oxygen equivalent annealing process, the specific preparation steps are as follows:

[0046] Step 1. Select grade 0 sponge titanium, 14% TA1 titanium chips, and 8 boxes of TA1 thin titanium sheets to mix. The titanium chips and titanium sheets are processed by shearing, sorting and pickling. After the surface of the smelted slab is milled, partially ground, chamfered and sawed, a TA2 slab with a thickness of 192mm is prepared. The content of impurity elements in the TA2 slab is Fe0.025%, C 0.012%, N 0.0061%, H≤0.001% and O 0.094%;

[0047] Step 2: Heating the prepared TA2 slabs to 890°C and 790°C respectively, and rolling them into TA2 plates with a thickness of 14mm according to the secondary fire of 192mm→30mm→14mm;

[0048]Step 3. Atmospheric annealing of the 14 mm TA2 plate in step 2 in a roller hearth furnace, the oxygen equivalent is 0.131%, the annealing temperature is 580 ° C, the holding t...

Embodiment 2

[0051] A method for preparing a TA2 hot-rolled pure titanium plate based on an oxygen equivalent annealing process, the specific preparation steps are as follows:

[0052] Step 1: Select TA1-FH titanium sheet material, TA2 titanium chip briquette, TA1-FH titanium sheet material and TA3 titanium chip briquette to mix, titanium chips and titanium sheet material are processed by shearing, sorting and pickling, use Electron beam cold bed furnace smelts once, after milling, local grinding, chamfering and sawing on the surface of the smelted slab, a TA2 slab with a thickness of 210mm is prepared, and the content of impurity elements in the TA2 slab is % by weight Fe 0.039%, C 0.017%, N 0.012%, H≤0.001% and O 0.113%;

[0053] Step 2: Heating the prepared TA2 slabs to 850°C and 750°C respectively, and rolling them into TA2 plates with a thickness of 12mm according to the secondary fire of 210mm→40mm→12mm;

[0054] Step 3. Atmospheric annealing of the 12mm finished plate in step 2 in ...

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