Preparation method of heavy-calibre nickel base alloy thin-walled tubular product

A technology of nickel-based alloy and thin-walled pipe, which is applied in the field of pipe processing to achieve the effects of increased material utilization, refined structure, and high added value of products

Inactive Publication Date: 2012-05-23
有研科技集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] A search of existing technical literature found that the method of preparing large-diameter nickel-based alloy (Hastelloy alloy) thin-walled pipes by centrifugal casting + spinning technology has been reported, involving the use of forged rod hot rev

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0028] Example 1

[0029] The processing object is MonelK500 alloy. The diameter of the machined forged bar is Φ418mm. It is preheated to 180℃ and sprayed with high temperature anti-oxidation glass lubricant, then heated to 1100℃ for 2h, covered with glass lubricating powder; put into the extrusion cylinder. Extrusion, the material of extrusion die, extrusion rod and extrusion barrel is Inconel718 high temperature alloy, the preheating temperature of extrusion die, extrusion barrel and extrusion rod is 550℃, the lubricant for extrusion die and extrusion barrel It is cylinder oil + graphite + molybdenum disulfide, the extrusion speed is 25mm / s, the extrusion ratio is 10.8, the outer diameter of the extruded pipe is Φ420mm, and the wall thickness is 10mm. After the extruded pipe is polished and pickled, a three-wheel powerful spinning machine is used to spin down and reduce the wall. The first pass is 20% thinner, and the subsequent pass is 25% thinner. The feed ratio is 0.7mm / n, ...

Example Embodiment

[0030] Example 2

[0031] The processing object is Monel500 alloy. The diameter of the machined forged bar is 298mm. It is preheated to 200℃ and sprayed with high temperature anti-oxidation glass lubricant, then heated to 1080℃ for 2h, covered with glass lubricant powder; For extrusion, the preheating temperature of the extrusion die, extrusion barrel and extrusion rod is 550℃, the lubricant of the extrusion die and extrusion barrel is cylinder oil + graphite + molybdenum disulfide, and the extrusion speed is 45mm / s. The extrusion ratio is 9.6, the outer diameter of the extruded pipe is Φ300mm, and the wall thickness is 8mm. After the extruded pipe is polished and pickled, the wall is reduced by a three-wheel powerful spinning machine. The thinning rate of the first pass is 22%, the thinning rate of the subsequent passes is 25-30%, and the first two passes of the finished product The feed ratio of is 0.7mm / n, and the feed ratio of other passes is 1.5mm / n. The amount of deformat...

Example Embodiment

[0032] Example 3

[0033] The processing object is Inconel718 alloy. The diameter of the machined forged bar is 198mm. It is preheated to 260℃ and sprayed with high temperature anti-oxidation glass lubricant, then heated to 1200℃ for 2h, covered with glass lubricating powder; put into the extrusion cylinder. Extrusion, the preheating temperature of the extrusion die, extrusion barrel and extrusion rod is 550℃, the lubricant of the extrusion die and extrusion barrel is cylinder oil + graphite + molybdenum disulfide, the extrusion speed is 40mm / s, The extrusion ratio is 3.6, the outer diameter of the extruded pipe is Φ200mm, and the wall thickness is 15mm. After the extruded pipe is polished and pickled, a three-wheel powerful spinning machine is used to spin down and reduce the wall. The first pass is 20% thinner, and the subsequent pass is 25% thinner. The feed ratio is 0.6mm / n, the feed ratio of other passes is 1.1mm / n, the deformation between the solid solutions is 65%, the so...

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PUM

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Abstract

The invention relates to a preparation method of a heavy-calibre nickel base alloy thin-walled tubular product, which comprises the steps of: 1, preparing a nickel base alloy tube blank by adopting a thermal backward extrusion process, wherein the extrusion temperature is 1000-1250 DEG C, the worker die preheating temperature is 450-550 DEG C, the extrusion speed is 25mm/s-60mm/s; 2, thinning through cold spinning with strong force, wherein the first pass of thinning rate is 20-75 percent, other passes of thinning rates are 25-30 percent, the deformation during thermal treatment (annealing or solution treatment) is 50-75 percent, the feeding ratio of two passes before a finished product is obtained is 0.5mm/n-0.7mm/n, and feeding ratios of other passes are 0.8mm/n-1.5mm/n; and 3, carrying out thermal treatment (annealing or solution treatment) on a semi-finished product or finished product, scouring and cleaning. The heavy-calibre nickel base alloy thin-walled tubular product processed by adopting the invention has the advantages of high material utilization rate, low cost and high additional value, is suitable for massive production, and has remarkable economic benefit and social benefit.

Description

technical field [0001] The invention relates to a method for preparing a large-diameter nickel-based alloy thin-walled pipe, belonging to the technical field of pipe processing. Background technique [0002] Nickel-based alloy pipes have good high-temperature corrosion resistance, oxidation resistance and excellent corrosion resistance. Large-diameter nickel-based alloy thin-walled pipes are mainly used in aviation, chemical, nuclear energy installations and other fields. The preparation of large-diameter nickel-based alloy thin-walled pipes is difficult. The traditional methods for producing large-diameter nickel-based alloy thin-walled pipes mainly include ①Nickel-based alloy forged rod + machining (drilling and turning). The utilization rate is extremely low and the waste is serious. ②Centrifugal casting + spinning process to prepare large-diameter nickel-based alloy thin-walled pipes. This method has been successfully used in Hastelloy series alloy large-diameter nickel-...

Claims

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Application Information

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IPC IPC(8): B21C37/06B21C23/02C22F1/10
Inventor 郭胜利李德富彭海健郭青苗杜鹏
Owner 有研科技集团有限公司
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