CN111996478B - Method for removing surface hairline of N06600 nickel-based alloy pierced billet - Google Patents
Method for removing surface hairline of N06600 nickel-based alloy pierced billet Download PDFInfo
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- CN111996478B CN111996478B CN202010847387.XA CN202010847387A CN111996478B CN 111996478 B CN111996478 B CN 111996478B CN 202010847387 A CN202010847387 A CN 202010847387A CN 111996478 B CN111996478 B CN 111996478B
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/10—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of nickel or cobalt or alloys based thereon
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/08—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tubular bodies or pipes
- C21D9/085—Cooling or quenching
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/02—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working in inert or controlled atmosphere or vacuum
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
- C23G1/08—Iron or steel
- C23G1/086—Iron or steel solutions containing HF
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G3/00—Apparatus for cleaning or pickling metallic material
- C23G3/04—Apparatus for cleaning or pickling metallic material for cleaning pipes
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- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
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- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
Abstract
The invention relates to a method for removing hairlines on the surface of a nickel-based alloy pierced billet, which comprises the following steps: selecting a serious hairline area on the surface of a pierced billet, cutting and preparing a metallographic sample, and measuring the hairline depth; setting the annealing furnace at 1010-1070 ℃ in an oxidizing atmosphere; placing the pierced billet into an annealing furnace for surface oxidation heat treatment, and after heat preservation is finished, taking the pierced billet out of the furnace for water cooling; preparing a pickling solution, wherein the volume percentage of hydrofluoric acid is 6-10%, and the volume percentage of nitric acid is 12-18%; heating the pickling solution to 45-65 ℃; putting the pierced billet into a pickling solution to be soaked for 10-15 minutes; after the pierced billet is lifted out, washing the inner surface and the outer surface by water; placing the pierced billet on a rack, drying, and inspecting the inner surface and the outer surface. The method has the advantages of obvious effect, simple process steps, easy operation, complete hairline removal and good effect, and effectively solves the problem that the hairline on the surface of the nickel-based alloy pierced billet is difficult to remove.
Description
Technical Field
The invention belongs to the technical field of pipe manufacturing, and particularly relates to a method for removing surface hairlines of an N06600 nickel-based alloy pierced billet.
Background
A hairline is a seam in which a crack in metal can be more or less closed, but not completely closed, by rolling or other processing. The hairline is in a fine straight line, spiral or net shape on the inner surface and the outer surface of the steel pipe, is mostly distributed in a large area and densely, is extremely difficult to treat completely once formed, has extremely low production efficiency, and only can expand and extend residual hairlines in the subsequent deformation process, so that the residual hairlines cannot be eliminated, and the product is unqualified. With the gradual application of low-cost hot piercing to nickel-based alloys, the high heat deformation resistance thereof presents certain limitations in the process, so that the occurrence of pierced billet hair cracks is frequent.
The method has the advantages that the large-area point grinding or integral polishing for removing the hairline on the surface of the N06600 nickel-based alloy pierced billet is a widely-applied method, the hairline of a ground area can be completely removed, the hairline is easy to miss, and the method is the method with the lowest working efficiency; the integral polishing efficiency is high, but the polishing is uneven due to poor straightness and uneven wall thickness of the pierced billet, a plurality of places are polished more, and a plurality of places are polished insufficiently. Because of the great operation difficulty, the two methods have poorer effect of removing the hairline on the inner surface of the pierced billet.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide the method for removing the surface hairline of the N06600 nickel-based alloy pierced billet, which has the advantages of obvious effect, simple process steps and easy operation.
According to the technical scheme provided by the invention, the method for removing the surface hairline of the N06600 nickel-based alloy pierced billet comprises the following steps:
a. selecting a serious hairline area on the surface of the N06600 nickel-based alloy pierced billet, transversely cutting a hairline sample to prepare a metallographic sample, and measuring the hairline depth lambda in a microscope;
b. setting the temperature of the roller-hearth type controlled atmosphere continuous annealing furnace at 1010-1070 ℃, wherein the atmosphere in the furnace is oxidizing atmosphere;
c. placing the pierced billet into a roller-hearth type controlled atmosphere continuous annealing furnace for surface oxidation heat treatment, wherein the heat preservation time of the surface oxidation heat treatment is 30-120 min, and after the heat preservation is finished, taking the pierced billet out of the furnace for water cooling;
d. adding hydrofluoric acid and nitric acid into water to prepare a pickling solution, wherein in the pickling solution, the volume percentage of the hydrofluoric acid is 6-10%, and the volume percentage of the nitric acid is 12-18%;
e. heating the pickling solution obtained in the step d to 45-65 ℃;
f. c, placing the pierced billets obtained in the step c into the heated pickling solution obtained in the step e for soaking for 10-15 minutes;
g. d, after the pierced billet obtained in the step f is lifted out, washing the inner surface and the outer surface of the nickel-based alloy pierced billet by water;
h. and g, placing the pierced billet obtained in the step g on a rack, drying, and then testing the inner surface and the outer surface of the nickel-based alloy pierced billet.
Preferably, the method comprises the following steps: in the step a, the hair line depth lambda is graded, the first grade is lambda less than 20 mu m, the second grade is lambda less than 30 mu m and more than or equal to 20 mu m, and the third grade is lambda more than or equal to 30 mu m.
Preferably, the method comprises the following steps: in the step b, setting the temperature T of the roller hearth type controlled atmosphere continuous annealing furnace according to the grading of the hairline depth lambda;
when the hairline depth lambda is in the first grade, T is more than or equal to 1010 ℃ and less than 1020 ℃;
when the hairline depth lambda is in the second grade, T is more than or equal to 1020 ℃ and less than 1050 ℃;
when the hairline depth lambda is in the third grade, T is more than or equal to 1050 ℃ and less than 1080 ℃.
Preferably, the method comprises the following steps: in the step c, the heat preservation time t is set according to the grading of the hairline depth lambda;
when the hairline depth lambda is in the first gear, t is more than or equal to 30min and less than 40 min;
when the hairline depth lambda is in the second gear, t is more than or equal to 40min and less than 70 min;
when the hairline depth lambda is in the third gear, t is more than or equal to 70min and less than 120 min.
Preferably, the method comprises the following steps: in the step b, the air-fuel ratio of the roller hearth type controlled atmosphere continuous annealing furnace is 1.5-2.5.
Compared with the prior art, the invention has the beneficial effects that:
according to the invention, a layer of oxide skin is generated on the surface of the N06600 nickel-based alloy pierced billet by utilizing heat treatment, and then the oxide skin is stripped in an acid washing manner, so that the hair lines are removed; the method effectively removes the surface hairline of the N06600 nickel-based alloy pierced billet through the setting of scientific heat treatment temperature and heat preservation time, the adjustment of air-fuel ratio and a reasonable acid washing method; the method ensures that oxide skins generated on the inner surface and the outer surface of the pierced billet are uniform and consistent, the thickness of the oxide skins is controllable, the hairline removal is complete, the effect is good, and the problem that the hairline on the surface of the N06600 nickel-based alloy pierced billet is difficult to remove is effectively solved.
Detailed Description
The present invention will be further described with reference to the following specific examples.
Example 1
The method for removing the surface hairline of the N06600 nickel base alloy pierced billet comprises the following steps:
a. selecting a serious hairline area on the surface of the N06600 nickel-based alloy pierced billet, transversely cutting a hairline sample to prepare a metallographic sample, and measuring the hairline depth lambda =15 μm by using a microscope;
b. setting the temperature of the roller hearth type controlled atmosphere continuous annealing furnace at 1010 ℃, wherein the atmosphere in the furnace is oxidizing atmosphere, and the air-fuel ratio is 1.5;
c. placing the pierced billet into a roller-hearth type controlled atmosphere continuous annealing furnace for surface oxidation heat treatment, wherein the heat preservation time of the surface oxidation heat treatment is 30min, and after the heat preservation is finished, taking the pierced billet out of the furnace for water cooling;
d. adding hydrofluoric acid and nitric acid into water to prepare a pickling solution, wherein in the pickling solution, the volume percentage of the hydrofluoric acid is 6 percent, and the volume percentage of the nitric acid is 12 percent;
e. heating the pickling solution obtained in the step d to 45 ℃;
f. c, putting the pierced billets obtained in the step c into the heated pickling solution obtained in the step e for soaking for 10 minutes;
g. d, after the pierced billet obtained in the step f is lifted out, washing the inner surface and the outer surface of the nickel-based alloy pierced billet by water;
h. and g, placing the pierced billet obtained in the step g on a rack, drying, and then testing the inner surface and the outer surface of the nickel-based alloy pierced billet.
The surface hairline of the N06600 nickel base alloy pierced billet treated by the embodiment is completely removed.
Example 2
The method for removing the surface hairline of the N06600 nickel base alloy pierced billet comprises the following steps:
a. selecting a serious hairline area on the surface of the N06600 nickel-based alloy pierced billet, transversely cutting a hairline sample to prepare a metallographic sample, and measuring the hairline depth lambda =18 mu m by a microscope;
b. setting the temperature of the roller hearth type controlled atmosphere continuous annealing furnace at 1020 ℃, wherein the atmosphere in the furnace is oxidizing atmosphere, and the air-fuel ratio is 1.5;
c. placing the pierced billet into a roller-hearth type controlled atmosphere continuous annealing furnace for surface oxidation heat treatment, wherein the heat preservation time of the surface oxidation heat treatment is 39min, and after the heat preservation is finished, taking the pierced billet out of the furnace for water cooling;
d. adding hydrofluoric acid and nitric acid into water to prepare a pickling solution, wherein in the pickling solution, the volume percentage of the hydrofluoric acid is 10 percent, and the volume percentage of the nitric acid is 18 percent;
e. heating the pickling solution obtained in the step d to 65 ℃;
f. c, placing the pierced billets obtained in the step c into the heated pickling solution obtained in the step e for soaking for 15 minutes;
g. d, after the pierced billet obtained in the step f is lifted out, washing the inner surface and the outer surface of the nickel-based alloy pierced billet by water;
h. and g, placing the pierced billet obtained in the step g on a rack, drying, and then testing the inner surface and the outer surface of the nickel-based alloy pierced billet.
The surface hairline of the N06600 nickel base alloy pierced billet treated by the embodiment is completely removed.
Example 3
The method for removing the surface hairline of the N06600 nickel base alloy pierced billet comprises the following steps:
a. selecting a serious hairline area on the surface of the N06600 nickel-based alloy pierced billet, transversely cutting a hairline sample to prepare a metallographic sample, and measuring the hairline depth lambda =23 μm by using a microscope;
b. setting the temperature of the roller hearth type controlled atmosphere continuous annealing furnace at 1030 ℃, wherein the atmosphere in the furnace is oxidizing atmosphere, and the air-fuel ratio is 2.0;
c. placing the pierced billet into a roller-hearth type controlled atmosphere continuous annealing furnace for surface oxidation heat treatment, wherein the heat preservation time of the surface oxidation heat treatment is 60min, and after the heat preservation is finished, taking the pierced billet out of the furnace for water cooling;
d. adding hydrofluoric acid and nitric acid into water to prepare a pickling solution, wherein in the pickling solution, the volume percentage of the hydrofluoric acid is 6 percent, and the volume percentage of the nitric acid is 12 percent;
e. heating the pickling solution obtained in the step d to 45 ℃;
f. c, putting the pierced billets obtained in the step c into the heated pickling solution obtained in the step e for soaking for 10 minutes;
g. d, after the pierced billet obtained in the step f is lifted out, washing the inner surface and the outer surface of the nickel-based alloy pierced billet by water;
h. and g, placing the pierced billet obtained in the step g on a rack, drying, and then testing the inner surface and the outer surface of the nickel-based alloy pierced billet.
The surface hairline of the N06600 nickel base alloy pierced billet treated by the embodiment is completely removed.
Example 4
The method for removing the surface hairline of the N06600 nickel base alloy pierced billet comprises the following steps:
a. selecting a serious hairline area on the surface of the N06600 nickel-based alloy pierced billet, transversely cutting a hairline sample to prepare a metallographic sample, and measuring the hairline depth lambda =29 mu m by a microscope;
b. setting the temperature of the roller hearth type controlled atmosphere continuous annealing furnace at 1045 ℃, wherein the atmosphere in the furnace is oxidizing atmosphere, and the air-fuel ratio is 2.0;
c. placing the pierced billet into a roller-hearth type controlled atmosphere continuous annealing furnace for surface oxidation heat treatment, wherein the heat preservation time of the surface oxidation heat treatment is 65min, and after the heat preservation is finished, taking the pierced billet out of the furnace for water cooling;
d. adding hydrofluoric acid and nitric acid into water to prepare a pickling solution, wherein in the pickling solution, the volume percentage of the hydrofluoric acid is 10 percent, and the volume percentage of the nitric acid is 18 percent;
e. heating the pickling solution obtained in the step d to 65 ℃;
f. c, placing the pierced billets obtained in the step c into the heated pickling solution obtained in the step e for soaking for 15 minutes;
g. d, after the pierced billet obtained in the step f is lifted out, washing the inner surface and the outer surface of the nickel-based alloy pierced billet by water;
h. and g, placing the pierced billet obtained in the step g on a rack, drying, and then testing the inner surface and the outer surface of the nickel-based alloy pierced billet.
The surface hairline of the N06600 nickel base alloy pierced billet treated by the embodiment is completely removed.
Example 5
The method for removing the surface hairline of the N06600 nickel base alloy pierced billet comprises the following steps:
a. selecting a serious hairline area on the surface of the N06600 nickel-based alloy pierced billet, transversely cutting a hairline sample to prepare a metallographic sample, and measuring the hairline depth lambda =35 mu m by a microscope;
b. setting the temperature of the roller hearth type controlled atmosphere continuous annealing furnace at 1055 ℃, wherein the atmosphere in the furnace is oxidizing atmosphere, and the air-fuel ratio is 2.5;
c. placing the pierced billet into a roller-hearth type controlled atmosphere continuous annealing furnace for surface oxidation heat treatment, wherein the heat preservation time of the surface oxidation heat treatment is 75min, and after the heat preservation is finished, taking the pierced billet out of the furnace for water cooling;
d. adding hydrofluoric acid and nitric acid into water to prepare a pickling solution, wherein in the pickling solution, the volume percentage of the hydrofluoric acid is 6 percent, and the volume percentage of the nitric acid is 12 percent;
e. heating the pickling solution obtained in the step d to 45 ℃;
f. c, putting the pierced billets obtained in the step c into the heated pickling solution obtained in the step e for soaking for 10 minutes;
g. d, after the pierced billet obtained in the step f is lifted out, washing the inner surface and the outer surface of the nickel-based alloy pierced billet by water;
h. and g, placing the pierced billet obtained in the step g on a rack, drying, and then testing the inner surface and the outer surface of the nickel-based alloy pierced billet.
The surface hairline of the N06600 nickel base alloy pierced billet treated by the embodiment is completely removed.
Example 6
The method for removing the surface hairline of the N06600 nickel base alloy pierced billet comprises the following steps:
a. selecting a serious hairline area on the surface of the N06600 nickel-based alloy pierced billet, transversely cutting a hairline sample to prepare a metallographic sample, and measuring the hairline depth lambda =41 mu m by a microscope;
b. setting the temperature of the roller hearth type controlled atmosphere continuous annealing furnace at 1078 ℃, wherein the atmosphere in the furnace is oxidizing atmosphere, and the air-fuel ratio is 2.5;
c. placing the pierced billet into a roller-hearth type controlled atmosphere continuous annealing furnace for surface oxidation heat treatment, wherein the heat preservation time of the surface oxidation heat treatment is 118min, and after the heat preservation is finished, taking the pierced billet out of the furnace for water cooling;
d. adding hydrofluoric acid and nitric acid into water to prepare a pickling solution, wherein in the pickling solution, the volume percentage of the hydrofluoric acid is 10 percent, and the volume percentage of the nitric acid is 18 percent;
e. heating the pickling solution obtained in the step d to 65 ℃;
f. c, placing the pierced billets obtained in the step c into the heated pickling solution obtained in the step e for soaking for 15 minutes;
g. d, after the pierced billet obtained in the step f is lifted out, washing the inner surface and the outer surface of the nickel-based alloy pierced billet by water;
h. and g, placing the pierced billet obtained in the step g on a rack, drying, and then testing the inner surface and the outer surface of the nickel-based alloy pierced billet.
The surface hairline of the N06600 nickel base alloy pierced billet treated by the embodiment is completely removed.
In addition to the above embodiments, the present invention may have other embodiments. All technical solutions formed by adopting equivalent substitutions or equivalent transformations fall within the protection scope of the claims of the present invention.
Claims (2)
1. A method for removing hairline on the surface of a nickel-based alloy pierced billet is characterized by comprising the following steps:
a. selecting a severe hairline area on the surface of a N06600 nickel-based alloy pierced billet, transversely cutting a hairline sample to prepare a metallographic sample, measuring the hairline depth lambda in a microscope, and grading according to the hairline depth lambda, wherein the first grade is that lambda is less than 20 mu m, the second grade is that lambda is less than or equal to 20 mu m and less than 30 mu m, and the third grade is that lambda is greater than or equal to 30 mu m;
b. setting the temperature T of the roller hearth type controlled atmosphere continuous annealing furnace according to the grading of the hairline depth lambda: when the hairline depth lambda is in the first grade, T is more than or equal to 1010 ℃ and less than 1020 ℃; when the hairline depth lambda is in the second grade, T is more than or equal to 1020 ℃ and less than 1050 ℃; when the hairline depth lambda is in the third grade, T is more than or equal to 1050 ℃ and less than 1080 ℃, and the atmosphere in the furnace is oxidizing atmosphere;
c. putting the pierced billet into a roller-hearth type controllable atmosphere continuous annealing furnace for surface oxidation heat treatment, wherein the heat preservation time t of the surface oxidation heat treatment is set according to the grading of hairline depth lambda: when the hairline depth lambda is in the first gear, t is more than or equal to 30min and less than 40 min; when the hairline depth lambda is in the second gear, t is more than or equal to 40min and less than 70 min; when the hairline depth lambda is in the third grade, t is more than or equal to 70min and less than 120min, and after heat preservation is finished, discharging the pierced billet from the furnace and carrying out water cooling;
d. adding hydrofluoric acid and nitric acid into water to prepare a pickling solution, wherein in the pickling solution, the volume percentage of the hydrofluoric acid is 6-10%, and the volume percentage of the nitric acid is 12-18%;
e. heating the pickling solution obtained in the step d to 45-65 ℃;
f. c, placing the pierced billets obtained in the step c into the heated pickling solution obtained in the step e for soaking for 10-15 minutes;
g. d, after the pierced billet obtained in the step f is lifted out, washing the inner surface and the outer surface of the nickel-based alloy pierced billet by water;
h. and g, placing the pierced billet obtained in the step g on a rack, drying, and then testing the inner surface and the outer surface of the nickel-based alloy pierced billet.
2. The method for removing the surface hairline of the nickel-based alloy pierced billet according to the claim 1, which is characterized in that: in the step b, the air-fuel ratio of the roller hearth type controlled atmosphere continuous annealing furnace is 1.5-2.5.
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| JPS6141753A (en) * | 1984-08-04 | 1986-02-28 | Sumitomo Metal Ind Ltd | Method for heating ni alloy slab |
| CN101664759A (en) * | 2009-09-28 | 2010-03-10 | 西部金属材料股份有限公司 | Preparation method of small-specification thick-wall titanium alloy tubular product |
| CN104307876A (en) * | 2014-10-20 | 2015-01-28 | 张家港市人和高精管有限公司 | Production process of precise seamless steel tube for hydraulic cylinder |
| CN107779666A (en) * | 2016-08-30 | 2018-03-09 | 天工爱和特钢有限公司 | A kind of titanium alloy tube and preparation technology |
| CN111015375B (en) * | 2019-12-17 | 2022-08-12 | 江苏隆达超合金股份有限公司 | Method for removing straightening residual stress of nickel base pipe by polishing |
| CN111060670B (en) * | 2019-12-18 | 2022-06-10 | 江苏隆达超合金股份有限公司 | Method for detecting crack defects on inner surface of nickel-based alloy pierced billet by acid washing |
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