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Method for removing hairlines on the surface of n06600 nickel base alloy waste tube

A nickel-based alloy and waste pipe technology, which is applied in the field of pipe manufacturing, can solve the problems of difficult operation, uneven polishing, poor straightness of the waste pipe, and uneven wall thickness.

Active Publication Date: 2021-09-10
江苏隆达超合金股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] For a long time, large-area spot grinding or overall polishing to remove the hairlines on the surface of the N06600 nickel-based alloy waste tube. Spot grinding is a widely used method, which can remove the hairlines on the ground area, but it is easy to miss the hairlines, and It is the method with the lowest working efficiency; the overall polishing efficiency is high, but due to the poor straightness and wall thickness unevenness of the waste tube, the polishing is uneven, some places are over-polished, and some places are not polished enough
Due to the difficulty of operation, these two methods are less effective in removing hairlines on the inner surface of the waste tube

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A method for removing hairlines on the surface of N06600 nickel-based alloy waste tube may further comprise the steps:

[0029] a. Select the severe hairline area on the surface of the N06600 nickel-based alloy waste tube, cut the hairline sample horizontally and make a metallographic sample, and measure the hairline depth λ=15μm under a microscope;

[0030] b. Set the temperature of the roller hearth type controlled atmosphere continuous annealing furnace at 1010°C, the atmosphere in the furnace is an oxidizing atmosphere, and the air-fuel ratio is 1.5;

[0031] c. Put the blank pipe into the roller hearth type controlled atmosphere continuous annealing furnace for surface oxidation heat treatment. The holding time for surface oxidation heat treatment is 30min. After the heat preservation is completed, the blank pipe is taken out of the furnace for water cooling;

[0032] D, add hydrofluoric acid and nitric acid to prepare pickling liquid in water, in pickling liquid, ...

Embodiment 2

[0039] A method for removing hairlines on the surface of N06600 nickel-based alloy waste tube may further comprise the steps:

[0040] a. Select the severe hairline area on the surface of the N06600 nickel-based alloy waste tube, cut the hairline sample horizontally and make a metallographic sample, and measure the hairline depth λ=18μm under a microscope;

[0041] b. Set the temperature of the roller hearth type controlled atmosphere continuous annealing furnace at 1020°C, the atmosphere in the furnace is an oxidizing atmosphere, and the air-fuel ratio is 1.5;

[0042] c. Put the blank tube into a roller hearth type controlled atmosphere continuous annealing furnace for surface oxidation heat treatment. The holding time for surface oxidation heat treatment is 39 minutes. After the heat preservation is completed, the blank tube is taken out of the furnace for water cooling;

[0043] D, add hydrofluoric acid and nitric acid to prepare pickling liquid in water, in pickling liqui...

Embodiment 3

[0050] A method for removing hairlines on the surface of N06600 nickel-based alloy waste tube may further comprise the steps:

[0051] a. Select the severe hairline area on the surface of the N06600 nickel-based alloy waste tube, cut the hairline sample horizontally and make a metallographic sample, and measure the hairline depth λ=23μm under a microscope;

[0052] b. Set the temperature of the roller hearth type controlled atmosphere continuous annealing furnace at 1030°C, the atmosphere in the furnace is an oxidizing atmosphere, and the air-fuel ratio is 2.0;

[0053] c. Put the blank tube into a roller hearth type controlled atmosphere continuous annealing furnace for surface oxidation heat treatment. The holding time for surface oxidation heat treatment is 60 minutes. After the heat preservation is completed, the blank tube is taken out of the furnace for water cooling;

[0054] D, add hydrofluoric acid and nitric acid to prepare pickling liquid in water, in pickling liqui...

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PUM

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Abstract

The invention relates to a method for removing hairlines on the surface of a nickel-based alloy blank pipe, which comprises: selecting a severe hairline area on the surface of the blank pipe, cutting and making a metallographic sample and measuring the hairline depth; setting the annealing furnace at 1010-1070°C , oxidizing atmosphere; put the blank tube into the annealing furnace for surface oxidation heat treatment, after the heat preservation is over, the blank tube is taken out of the furnace for water cooling; prepare pickling solution, the volume percentage of hydrofluoric acid is 6~10%, and the volume percentage of nitric acid is 12 ~18%; heat the pickling solution to 45~65°C; soak the waste tube in the pickling solution for 10-15 minutes; lift the waste tube out and rinse the inner and outer surfaces with water; place the waste tube on the bench Inspect the interior and exterior surfaces after rack drying. The invention has remarkable effects, simple process steps and easy operation, completely removes hairlines and has good effect, and effectively solves the problem that hairlines on the surface of nickel-based alloy blank tubes are difficult to remove.

Description

technical field [0001] The invention belongs to the technical field of pipe material manufacturing, in particular to a method for removing hairlines on the surface of N06600 nickel-based alloy waste pipes. Background technique [0002] Hairlines are cracks in metal that can be more or less closed after rolling or other processing, but are not completely compressed. Hairlines are small straight lines, spirals or nets on the inner and outer surfaces of steel pipes, mostly in a large area and densely distributed. Once formed, it is extremely difficult to handle completely, and the production efficiency is extremely low. The remaining hairlines will only expand and extend during the subsequent deformation process. , will not be eliminated, causing the product to fail. As low-cost thermal piercing is gradually applied to nickel-based alloys, its high thermal deformation resistance shows certain limitations in the process, which makes hairlines appear from time to time. [0003]...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22F1/10C22F1/02C21D9/08C23G1/08C23G3/04
CPCC21D9/085C22F1/02C22F1/10C23G1/086C23G3/04
Inventor 王植栋浦益龙周向东高云龙陈芳
Owner 江苏隆达超合金股份有限公司