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Method for producing thin ta4 titanium material by coil cold rolling method

A cold rolling, titanium technology, applied in the production field of thin TA4 titanium, can solve the problems of structure and performance fluctuation, batch-to-batch fluctuation, poor surface quality, etc., to achieve fine and uniform structure, strong batch consistency, Good batch stability

Active Publication Date: 2018-04-24
LUOYANG SUNRUI TI PRECISION CASTING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Single-sheet rolling has low production efficiency, high cost, obvious fluctuations in structure and performance, poor hot-rolled precision and poor surface quality, poor shape of cold-rolled sheets, and obvious fluctuations between batches
[0008] At present, there are no relevant reports on coil cold rolling TA4 products. Due to the high strength and low plasticity of TA4 titanium, there are still some technical difficulties to be solved when using coil cold rolling.

Method used

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  • Method for producing thin ta4 titanium material by coil cold rolling method
  • Method for producing thin ta4 titanium material by coil cold rolling method
  • Method for producing thin ta4 titanium material by coil cold rolling method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Select high-quality grade 0 small particles (3~12.7mm particle size) sponge titanium, screen out fine titanium powder, edge skin, bluish black particles and hard blocks and other defective sponge titanium, and evenly add small pieces of pure iron flakes on the automatic material distribution system and TiO 2 Powder (purity ≥ 99%), electrode welding is performed in a vacuum welding chamber after pressing the electrode. The German ALD vacuum consumable electric arc furnace is used for three times of melting, peeling, forging and shaping to obtain a square slab. After milling, the ultrasonic flaw detection test is A-level. The nominal size of the slab is 200×1060×5500mm, and the TA4 slab Nominal composition Ti-0.3%Fe-0.25%O;

[0036] The slab is heated by natural gas in a walking furnace, and the furnace temperature is controlled at 870-920°C. When the furnace temperature is stable at ≥880°C, it is kept for 200-320 minutes and then rolled out of the furnace. The rough rol...

Embodiment 2

[0043] Select high-quality 0-grade sponge titanium, screen and pick out defective titanium sponge such as fine titanium powder, edge skin, bluish black particles and hard blocks, smelting and forging are the same as in Example 1, forging and shaping to obtain a square slab, and ultrasonically after milling The flaw detection is Class A, the nominal size of the slab is 200×1060×5500mm, and the nominal composition of the TA4 slab is Ti-0.32%Fe-0.25%O.

[0044] Production of hot-rolled coils: the production process is the same as in Example 1, and the specifications of the hot-rolled coils are 3.5mm×1050mm×about 300m.

[0045] Production of cold-rolled coils: Hot-rolled coils are produced after partial surface grinding to remove defects. For 1.2mm finished coils and strips, the production design is that the thickness of hot-rolled coils is 3.5mm → the deformation in the first rolling process is 41% to 2.05mm thick→690℃vacuum bell-type furnace coil annealing→second rolling process...

Embodiment 3

[0050] Select high-quality 0-grade sponge titanium, screen and pick out defective titanium sponge such as fine titanium powder, edge skin, bluish black particles and hard blocks, smelting and forging are the same as in Example 1, forging and shaping to obtain a square slab, and ultrasonic after milling 25%O。 The flaw detection test is A grade, the nominal size of the slab is 200 × 1060 × 5500mm, and the nominal composition of the TA4 slab is Ti-0.32%Fe-0. 25%O.

[0051] Production of hot-rolled coils: the production process is the same as in Example 1, and the specifications of the hot-rolled coils are 5mm×1050mm×about 300m.

[0052] Production of cold-rolled coils: hot-rolled coils are produced after partial surface grinding to remove defects. For finished coils and strips of 3mm (required thickness tolerance 0~+0.15mm), the production design is 5mm thick for hot-rolled coils → Deformation of 38% to 3.12mm thick in the first rolling process → Slitting into plates of required ...

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Abstract

The invention relates to a method for producing thin TA4 titanium material by coil cold rolling method. Through rational design of components, optimization of rolling process and production process, high-quality thin TA4 titanium material with a thickness of no more than 3 mm is produced; A4 titanium material is added with Higher content of Fe and O, so TA4 has higher strength, and its composition requires Fe≤0.5%, O≤0.4%, N≤0.05%, C≤0.08% and H≤0.015%; its tensile strength≥580MPa, elongation rate ≥ 20%; TA4 titanium material is produced by the coil method, the weight of each coil is more than 4t, and the maximum deformation of the rolling process can reach 45%. The continuous production of cold rolling mill and annealing furnace has high efficiency, low comprehensive cost, and The process is simple; the obtained TA4 titanium material has high dimensional accuracy and batch stability, the thickness accuracy does not exceed half of the GB / T 3621-2007 standard, and the control of the same plate difference does not exceed half of the thickness tolerance; the performance of the titanium material is consistent in batches Strong resistance, numerical fluctuation Cv ≤ 3%, fine and uniform structure, and stable grain size ≥ 7.

Description

technical field [0001] The invention relates to the technical field of production of thin TA4 titanium materials, in particular to a method for producing thin TA4 titanium materials by coil cold rolling. Background technique [0002] Due to its high specific strength, high toughness, good corrosion resistance, low elastic modulus, good formability and excellent biocompatibility, titanium is widely used in chemical, aviation and medical fields. Industrial pure titanium TA4 is equivalent to foreign Gr4 pure titanium (ASTM standard), has high strength and good corrosion resistance, cannot be strengthened by heat treatment, has good formability, is easy to weld and braze, and is widely used in various chemical petroleum Equipment, corrosion-resistant structural parts, aerospace components, surgical medical implant components, medical equipment, fixtures and assemblies, etc., the long-term working temperature is below 300 °C. [0003] The aging trend of the world and China's pop...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22F1/18C22F1/02C22C14/00
CPCC22C14/00C22F1/02C22F1/183
Inventor 刘喜波王树军刘茵琪
Owner LUOYANG SUNRUI TI PRECISION CASTING
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