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Short-flow preparation method of minor-caliber nickel-based alloy thin-wall tubes

A nickel-based alloy and thin-walled pipe technology, which is applied in metal extrusion control equipment, metal processing equipment, metal extrusion, etc., can solve the problems of high production cost and labor intensity of small-diameter nickel-based alloy thin-walled pipes , to achieve significant economic and social benefits, low labor intensity, and fewer processes

Inactive Publication Date: 2012-05-23
GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problems of high production cost and high labor intensity of small-diameter nickel-based alloy thin-walled pipes, and provide a new short-process, low-cost small-diameter nickel-based alloy thin-walled pipe short-process preparation method, specifically A short-process preparation method for producing small-diameter nickel-based alloy thin-walled pipes by centrifugal casting (thick-walled pipe billet) + hot extrusion + cold working

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] According to the Monel400 alloy, put the prepared raw materials into the medium frequency induction furnace and heat them to 1650°C. After standing still for 20 minutes, cool down to 1550°C after removing the slag, and pour the molten metal into the mold of the horizontal centrifugal casting machine. The rotating speed is 950 rpm, and a Menel400 tube blank is obtained, and the ratio of the inner diameter to the outer diameter of the tube blank is 0.5. After machining, the billet is heated to 180°C, sprayed with high-temperature anti-oxidation glass lubricant, then heated to 1050°C, kept for 1 hour, coated with glass lubricant powder, and hot-extruded at a speed of 45mm / s. The outer diameter of the pressed pipe is Φ72mm, the wall thickness is 6mm, and the extrusion ratio is 13. Use LG / LD and other series of cold rolling mills for cold processing, the pass processing rate is 14%, the deformation between annealing is 70%, and the annealing temperature is 920°C. According ...

Embodiment 2

[0025] According to the NCu40-2-1 alloy, put the prepared raw materials into the medium frequency induction furnace and heat to 1630°C, after standing for 15 minutes, cool down to 1520°C after removing the slag, and pour the molten metal into the mold of the horizontal centrifugal casting machine , the casting mold rotation speed is 750 rpm, and the NCu40-2-1 alloy tube blank is obtained, and the ratio of the inner diameter to the outer diameter of the tube blank is 0.55. After machining, the blank is heated to 190°C and coated with high-temperature antioxidant, then heated to 1000°C, kept for 1 hour, coated with glass lubricating powder, and hot-extruded at a speed of 48mm / s. The outer diameter is Φ70mm, the wall thickness is 5mm, and the extrusion ratio is 15.7. Using LG / LD and other series of cold rolling mills for cold processing, the deformation between rolling and annealing is 75%, the pass processing rate is 16%, and the annealing temperature is 880°C. Through the cold...

Embodiment 3

[0027] According to the NCu28-2.5-1.5 alloy, put the prepared raw material into the medium frequency induction furnace and heat it to 1670°C. After standing for 25 minutes, cool down to 1580°C after removing the slag, and pour the molten metal into the mold of the horizontal centrifugal casting machine. Among them, the casting speed is 1000 rpm, and the NCu28-2.5-1.5 tube blank is obtained, and the ratio of the inner diameter to the outer diameter of the tube blank is 0.48. After machining, the billet is heated to 200°C and coated with high-temperature antioxidant, then heated to 1100°C, kept for 2 hours, coated with glass lubricant powder, and then extruded at a speed of 52mm / s. The diameter is Φ73mm, the wall thickness is 6.5mm, and the extrusion ratio is 11.8. Use LG / LD and other series of cold rolling mills for cold processing, the pass processing rate is 12%, the deformation between annealing is 65%, and the annealing temperature is 950°C. Through the cold rolling proces...

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Abstract

The invention relates to a short-flow preparation method of minor-caliber nickel-based alloy thin-wall tubes, belonging to the technical field of processing non-ferrous metal material tubes, mainly comprising the following steps that: (1) centrifugal casting technology is carried out to prepare nickel-based alloy tube billets, wherein, the ratio of outer diameters and inner diameters of the tube billets is 0.4-0.6; (2) the hot extrusion temperature of nickel-based alloy tubes is 1000-1250 DEG C, and the extrusion ratio is 5-16; (3) LG / LD and other series of cold pilger mills or drawing machines are used for carrying out multi-pass cold processing to reduce the tube diameter and reduce the wall thickness, so as to obtain thin-wall tubes; and (4) intermediate annealing, final annealing and final tube straightening are carried out. The method has the advantages of short flow, low labor intensity, laborsaving shaping, low cost, and high production efficiency. The prepared minor-caliber nickel-based alloy thin-wall tubes have high additional values. The method is suitable for large scale production, and has remarkable economic benefits and social benefits.

Description

technical field [0001] The invention relates to a short-process preparation method of a nickel-based alloy thin-wall pipe with a small diameter, and belongs to the technical field of pipe processing of nonferrous metal materials. Background technique [0002] Nickel-based alloy pipes have good high temperature corrosion resistance, oxidation resistance and excellent corrosion resistance, and are widely used in aviation, aerospace vehicles, ships and submarines, chemicals, navigation, nuclear energy installations, metallurgy, electrical appliances, textiles, pulping , energy conversion devices, papermaking, food machinery, medical equipment and architectural decoration and other fields. However, the traditional process for preparing and processing small-diameter nickel-based alloy thin-walled pipes is long and the production cost is high. The production process mainly includes: ①Smelting→casting billets→heating→multi-fire forging→cooling→straightening→cutting bars Head and t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21C37/06C22F1/10B22D13/12B21C31/00
Inventor 郭胜利邬小萍李德富杜鹏郭青苗彭海健
Owner GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG
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