Method for preparing niobium sheet metal strip

A technology of metal niobium and strip, applied in metal rolling, metal rolling, metal processing equipment, etc., can solve the problems of low grain size, unstable elongation performance, short length of niobium strip, etc., and achieve high elongation Effect

Active Publication Date: 2008-05-14
WESTERN METAL MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, due to the small size of niobium raw materials, the produced niobium strips have the problems of short length, unstable elongation and low grain size.

Method used

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  • Method for preparing niobium sheet metal strip

Examples

Experimental program
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Effect test

Embodiment 1

[0019] One electron beam secondary smelting ingot, heated in an electric furnace at 800°C for 80 minutes, upsetting ratio 35% to a length of 130mm, and then stretched by 50% to a length of 195mm, flattened to 45×150×550mm, rolled in the first pass The second pass is 40% to thickness 27mm, the second pass is 35 to thickness 17.5mm, and then rolled to 2.0mm thickness for tension rolling to 0.2mm thickness. After the finished product is annealed at 900°C for 3 hours, the elongation of the strip reaches 38%, and the grain size is 10. Grade, the mechanical properties are shown in Table 1, and the strip length is 110 meters.

[0020] Table 1 Implementation Example 1 The room temperature mechanical properties of niobium strip

[0021] Tensile strength

Embodiment 2

[0023] Three secondary smelting ingots are heated in an electric furnace at 800°C for 80 minutes, the upsetting ratio is 35% to a length of 130mm, and the length is drawn by 50% to a length of 195mm, flattened to 45×150×550mm, and the first rolling pass is 40 % to a thickness of 27mm, the second pass is 35 to a thickness of 17.5mm, and then rolled to a thickness of 2.0mm, and the three billets are butt-welded into one by argon arc welding, and then tension-rolled to a thickness of 0.2mm, and the finished product is 900°C After 3 hours of annealing, the elongation rate of the strip reaches 34%, the grain size is 10 grades, the mechanical properties are shown in Table 2, and the strip length is 298 meters.

[0024] Table 2 Implementation Example 2 The room temperature mechanical properties of the niobium strip

[0025] Tensile strength

Embodiment 3

[0027] Three secondary smelting ingots are heated in an electric furnace at 1000°C for 75 minutes, the upsetting ratio is 35% to 100mm, and then the length is 50% to 160mm, flattened to 45×160×350mm, and the first rolling pass is 40% to the thickness 27mm, 35% in the second pass to a thickness of 17.5mm, and then rolled to a thickness of 2.0mm, the three billets were butt welded into one by argon arc welding, and then tension rolled to a thickness of 0.1mm, and the finished product was annealed at 850°C for 3h The elongation rate of the final strip reaches 31%, the grain size is grade 9, the mechanical properties are shown in Table 2, and the strip length is 400 meters.

[0028] The room temperature mechanical properties of table 3 implementation example 3 niobium bands

[0029] Tensile strength

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Abstract

A method for preparing metal niobium strips relates to a method for preparing metal niobium strips with high elongation and high grain size grade performance by using a forging and rolling process. Its preparation process includes the following processes in turn: (1) Electron beam melting niobium ingots with a diameter of 150-160mm are forged with an air hammer at a temperature of 800-1100°C; the processing rate of forging is controlled to upset 30%-40% once , pull 40% to 50% once, and the processing rate of flattening is 50% to 70%; (2) The processing rate of the first rolling pass is ≥ 40%, and the processing rate of the second pass is ≥ 35%. The processing rate of each pass is ≥15%; the direction of the extension of the billet during the rolling process is always the axial direction of the original ingot; (3) the annealing process is adopted at 850-900°C for 3-4 hours. The method of the present invention can obtain the refractory metal niobium strip with an elongation rate of 30% to 41% and a grain size grade of 8.5 to 10 to obtain excellent deep drawing performance, which can be punched into a CCFL electrode with a diameter of 1.6mm and a height of 8mm head.

Description

technical field [0001] A method for preparing metal niobium strips relates to a method for preparing metal niobium strips with high elongation and high grain size grade performance by using a forging and rolling process. Background technique [0002] Niobium strip is currently one of the main materials for manufacturing cold cathode fluorescent lamp (CCFL) tube electrode heads. Compared with molybdenum strip, it has a higher drawing ratio and a length more suitable for automatic production. As a backlight source for LCD screens, CCFL is currently solving the problems of low brightness and short service life, and its popularity among backlight manufacturers has reached 31%. According to evaluations, CCFL using niobium electrodes will account for the total market in the next five years. 50% of. The global demand for niobium strips reached 7,000 tons in 2007, which is a product with a long life cycle in the electronics industry, and the main influencing factor is the price of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/18B21J1/00B21B37/16
Inventor 武宇权振兴朱海林李高林杨晓维赵鸿磊曾蜀发刘宁平李俊宜楠任吉文邓自南
Owner WESTERN METAL MATERIAL
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