CN112317540A - Method for processing hollow steel pipe of drill rod - Google Patents
Method for processing hollow steel pipe of drill rod Download PDFInfo
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- CN112317540A CN112317540A CN202010880587.5A CN202010880587A CN112317540A CN 112317540 A CN112317540 A CN 112317540A CN 202010880587 A CN202010880587 A CN 202010880587A CN 112317540 A CN112317540 A CN 112317540A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 128
- 239000010959 steel Substances 0.000 title claims abstract description 128
- 238000000034 method Methods 0.000 title claims abstract description 37
- 238000011282 treatment Methods 0.000 claims description 78
- 238000000137 annealing Methods 0.000 claims description 65
- 239000000463 material Substances 0.000 claims description 23
- 238000005097 cold rolling Methods 0.000 claims description 22
- 238000010438 heat treatment Methods 0.000 claims description 16
- 238000007127 saponification reaction Methods 0.000 claims description 12
- 238000005554 pickling Methods 0.000 claims description 4
- 238000003672 processing method Methods 0.000 claims description 4
- 238000005336 cracking Methods 0.000 abstract description 7
- 238000004519 manufacturing process Methods 0.000 abstract description 6
- 238000005265 energy consumption Methods 0.000 abstract description 3
- 238000005266 casting Methods 0.000 abstract description 2
- 230000002035 prolonged effect Effects 0.000 abstract description 2
- 239000002253 acid Substances 0.000 description 12
- 238000005096 rolling process Methods 0.000 description 9
- 238000004140 cleaning Methods 0.000 description 6
- 239000011435 rock Substances 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 4
- 238000010622 cold drawing Methods 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 2
- 229910019142 PO4 Inorganic materials 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 229910052804 chromium Inorganic materials 0.000 description 2
- 239000011651 chromium Substances 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 238000005553 drilling Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000010410 layer Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000002161 passivation Methods 0.000 description 2
- 229910001562 pearlite Inorganic materials 0.000 description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 2
- 239000010452 phosphate Substances 0.000 description 2
- 238000010008 shearing Methods 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- QNRATNLHPGXHMA-XZHTYLCXSA-N (r)-(6-ethoxyquinolin-4-yl)-[(2s,4s,5r)-5-ethyl-1-azabicyclo[2.2.2]octan-2-yl]methanol;hydrochloride Chemical compound Cl.C([C@H]([C@H](C1)CC)C2)CN1[C@@H]2[C@H](O)C1=CC=NC2=CC=C(OCC)C=C21 QNRATNLHPGXHMA-XZHTYLCXSA-N 0.000 description 1
- 241001391944 Commicarpus scandens Species 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
- 229910001566 austenite Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910001567 cementite Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000010485 coping Effects 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- KSOKAHYVTMZFBJ-UHFFFAOYSA-N iron;methane Chemical compound C.[Fe].[Fe].[Fe] KSOKAHYVTMZFBJ-UHFFFAOYSA-N 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 239000012798 spherical particle Substances 0.000 description 1
- 239000002436 steel type Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B19/00—Tube-rolling by rollers arranged outside the work and having their axes not perpendicular to the axis of the work
- B21B19/02—Tube-rolling by rollers arranged outside the work and having their axes not perpendicular to the axis of the work the axes of the rollers being arranged essentially diagonally to the axis of the work, e.g. "cross" tube-rolling ; Diescher mills, Stiefel disc piercers or Stiefel rotary piercers
- B21B19/04—Rolling basic material of solid, i.e. non-hollow, structure; Piercing, e.g. rotary piercing mills
-
- 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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/10—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of tubular bodies
- C21D8/105—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of tubular bodies of ferrous alloys
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
The invention relates to a method for processing a hollow steel pipe of a drill rod, belonging to the field of steel pipe manufacturing. According to the invention, the steel is continuously annealed twice, so that the steel pipe is prevented from cracking, and the steel is easier to process by reducing the hardness of the steel, so that the quality stability of the final hollow steel is greatly improved, and the service life of the hollow steel pipe of the drill rod is prolonged; compared with the complexity of the traditional casting process, the invention greatly shortens the processing process steps of the hollow steel, has environment-friendly process and low energy consumption, and greatly reduces the industrial manufacturing cost.
Description
Technical Field
The invention relates to a method for processing a hollow steel pipe of a drill rod, belonging to the field of steel pipe manufacturing.
Background
The drill rod is an important component of the drill tool, and the hollow steel pipe is mainly used for producing the rock drilling drill rod. In the using process of the drill rod, the drill rod needs to be subjected to severe abrasion of rock and ore, high-pressure water flow or air flow and erosion and corrosion of mine water, and high-frequency impact of a rock drill needs to be borne, and with the occurrence of equipment such as hydraulic rock drilling and the like, the impact frequency and the impact energy of the rock drill are continuously increased, so that the hollow steel is a consumable tool which is necessary for basic industry, has the worst stress condition, the shortest service life and the highest technical content in all steel.
The performance of the hollow steel pipe mainly depends on the structure, so the material and the processing technology of the hollow steel are important influence factors of the quality of the final hollow steel. However, at present, domestic drill tool manufacturers still adopt a traditional two-wire forming process of a transverse rolling mill to produce hollow steel, the production flow of the hollow steel needs to go through links of cogging and intermediate billet coping, and most of the hollow steel is produced by adopting a cast tube method, so that the hollow steel has the disadvantages of long process route, high energy consumption, low yield and unstable quality, and cannot meet the requirements of users.
Disclosure of Invention
Aiming at the existing problems of the hollow steel pipe of the drill rod, the invention provides a method for processing the hollow steel pipe of the drill rod, which is used for shortening the process route of the hollow steel of the drill rod and improving the quality stability of the hollow steel of the drill rod.
The purpose of the invention is realized by the following technical scheme:
the processing method of the hollow steel pipe of the drill rod sequentially comprises a first annealing treatment, a second annealing treatment, a cold rolling treatment and a third annealing treatment, wherein the first two annealing treatments are the same as the third annealing treatment.
In the method for processing the hollow steel pipe of the drill rod, the temperatures of the first annealing treatment, the second annealing treatment and the third annealing treatment are 650-680 ℃. The first annealing treatment and the second annealing treatment are preferably spheroidizing annealing treatment, and the spheroidizing annealing treatment is to obtain a spherical pearlite structure, wherein cementite is spherical particles and is dispersed on a ferrite matrix, compared with flaky pearlite, the hardness is low, the cutting processing is convenient, in addition, the austenite crystal particles are not easy to grow up during quenching and heating, and the deformation and the cracking tendency of a workpiece are small during cooling.
In the processing method of the drill rod hollow steel pipe, the first annealing treatment, the second annealing treatment and the third annealing treatment are all performed by heating steel to 650-680 ℃ within 30-60min, preserving the heat for 5-6h, and then naturally cooling to 250-300 ℃.
In the method for processing the hollow steel pipe of the drill rod, the Rockwell hardness of the steel after the second annealing treatment is 16-20 HRC.
In the method for processing the hollow steel pipe of the drill rod, the Rockwell hardness of the steel after the third annealing treatment is 19-25 HRC.
In the processing method of the drill rod hollow steel pipe, the steel is subjected to heating and perforation treatment before the two annealing treatments, wherein the heating temperature is 1180-1220 ℃.
Suitable steel types that can be used in the present invention are ZK95CrMo, ZK55SiMnMo, ZK40SiMnCrNiMo, ZK35SiMnMoV, ZK23CrNi3Mo, ZK22SiMnCrNi2Mo, preferably ZK23CrNi3 Mo. In production, the 23CrNi3Mo steel is softened and annealed by using the residual heat after forging, the hardness is high, the processing is difficult, the high-temperature annealing temperature is too high, the crystal grains are coarse, the burning loss of the steel is serious, and the heat treatment process of the 23CrNi3Mo steel is as follows: the hollow steel is high enough in strength, but poor in toughness, and is easy to break and lose efficacy and cause serious economic loss in the practical application process. In order to reduce the hardness of the steel and improve the internal structure of the steel, the hardness of the steel is reduced to HRC24-28 through first annealing treatment, and then the hardness of the steel is reduced to HRC16-20 through second annealing treatment, so that the hardness of the steel completely meets the cold rolling condition, the internal structure of the steel is refined, and the steel cracking caused by cold rolling is avoided.
Cold rolling may also be cold drawing in the present invention, which is advantageous over cold drawing in terms of quality and dimensional accuracy of the final product. The hollow steel pipe for the drill rod processed by the method also has quite high physical stability.
In the method for processing the hollow steel pipe of the drill rod, acid pickling treatment is further included between the second annealing treatment and the cold rolling treatment. The surface layer of the hollow steel is corroded by acid washing, and the dissolution rate of the defect part is higher than that of other parts on the surface due to the chemical activity of the acid liquor, so that the whole surface tends to be uniformly balanced by the acid washing. The chromium-rich passivation film has the advantages that the corrosion resistance of the hollow steel is improved due to the composition and the structure of the chromium-rich passivation film.
In the method for processing the hollow steel pipe of the drill rod, phosphating treatment is also included between the second annealing treatment and the cold rolling.
In the method for processing the hollow steel pipe of the drill rod, saponification treatment is also included between the second annealing treatment and the cold rolling.
The phosphating and saponification treatment can not only enhance the corrosion resistance of the surface of the hollow steel, but also form a phosphate film as a lubricating carrier, and the phosphate film has good reaction with a lubricating agent, reduces the friction coefficient of the surface of the hollow steel in subsequent processing, and can generate a saponification layer with excellent adsorbability and lubricity on the surface of the hollow steel, thereby being beneficial to the smooth proceeding of the subsequent processing technology.
The hole pattern system special for the hollow steel pipe of the drill rod comprises a round hole pattern, a hexagonal hole pattern, a rhombic hole pattern, a universal hole pattern and combinations thereof, and the rolling specifications are H19-H35 and R32-R52. The length of the hollow steel is usually 6000mm-7000mm, the core deviation is small after cold rolling, the core hole has no sharp angle or obvious deformity, the inner and outer surfaces are smooth, the size precision is high, the bending degree of the hollow steel per meter is less than 2mm, the total bending degree is less than 0.1-0.2% of the total length, wherein the unit decarburized layer depth of the outer surface of the hollow steel is less than 0.15mm, and the internal crack is less than 0.1 mm.
Compared with the prior art, the invention has the following advantages: according to the invention, the steel is continuously annealed twice, so that the steel pipe is prevented from cracking, and the steel is easier to process by reducing the hardness of the steel, so that the quality stability of the final hollow steel is greatly improved, and the service life of the hollow steel pipe of the drill rod is prolonged; compared with the complexity of the traditional casting process, the invention greatly shortens the processing process steps of the hollow steel, has environment-friendly process and low energy consumption, and greatly reduces the industrial manufacturing cost.
Drawings
FIG. 1 is a cross section of a hollow steel produced in example 1.
Detailed Description
The following are specific examples of the present invention and further describe the technical solutions of the present invention, but the present invention is not limited to these examples.
Example 1:
shearing a steel material with the model of ZK23CrNi3Mo, heating the steel material as a blank to 1210 ℃, performing continuous spheroidizing annealing twice after center perforation to reduce the Rockwell hardness of the steel material to HRC18, performing acid cleaning, phosphorization and saponification, performing cold rolling by a continuous rolling mill set, performing annealing treatment for the third time to obtain a hollow steel billet with the Rockwell hardness of HRC20, and finally performing correction treatment to obtain the hollow steel. Wherein, the third annealing treatment is that the temperature of the steel is raised to 670 ℃ within 60min, the temperature is kept for 6h, and then the steel is naturally cooled to 300 ℃.
Example 2:
heating a steel material with the model of ZK95CrMo as a blank to 1200 ℃, continuously spheroidizing and annealing twice after center perforation to reduce the Rockwell hardness of the steel material to HRC19, carrying out acid cleaning, phosphorization and saponification, then carrying out cold rolling by a continuous rolling mill set, carrying out annealing treatment for the third time to obtain a hollow steel billet with the Rockwell hardness of HRC20, and finally carrying out correction treatment to obtain the hollow steel. Wherein, the annealing treatment for the third time is that the temperature of the steel is raised to 650 ℃ within 60min, the temperature is kept for 6h, and then the steel is naturally cooled to 300 ℃.
Example 3:
heating a steel material with the model of ZK55SiMnMo as a blank to 1180 ℃, continuously spheroidizing and annealing twice after center perforation to reduce the Rockwell hardness of the steel material to HRC16, carrying out acid cleaning, phosphorization and saponification, then carrying out cold rolling by a continuous rolling mill set, carrying out third annealing treatment to obtain a hollow steel billet with the Rockwell hardness of HRC18, and finally carrying out correction treatment to obtain the hollow steel. Wherein, the third annealing treatment is that the temperature of the steel is raised to 670 ℃ within 60min, the temperature is kept for 6h, and then the steel is naturally cooled to 300 ℃.
Example 4:
heating a steel material with the model of ZK40SiMnCrNiMo as a blank to 1220 ℃, continuously spheroidizing and annealing twice after center perforation to reduce the Rockwell hardness of the steel material to HRC20, carrying out acid cleaning, phosphorization and saponification, then carrying out cold rolling by a continuous rolling mill set, carrying out third annealing treatment to obtain a hollow steel billet with the Rockwell hardness of HRC22, and finally carrying out correction treatment to obtain the hollow steel. Wherein, the annealing treatment for the third time is that the temperature of the steel is raised to 680 ℃ within 60min, the temperature is kept for 6h, and then the steel is naturally cooled to 300 ℃.
Example 5:
heating a steel material with the model of ZK35SiMnMoV as a blank to 1180 ℃, continuously spheroidizing and annealing twice after center perforation to reduce the Rockwell hardness of the steel material to HRC20, carrying out acid cleaning, phosphorization and saponification, then carrying out cold rolling by a continuous rolling mill set, carrying out third annealing treatment to obtain a hollow steel billet with the Rockwell hardness of HRC23, and finally carrying out correction treatment to obtain the hollow steel. Wherein, the annealing treatment for the third time is that the temperature of the steel is raised to 680 ℃ within 60min, the temperature is kept for 6h, and then the steel is naturally cooled to 300 ℃.
Example 6:
heating a steel material with the model of ZK22SiMnCrNi2Mo as a blank to 1190 ℃, continuously spheroidizing and annealing twice after center perforation to reduce the Rockwell hardness of the steel material to HRC20, then carrying out acid cleaning, phosphorization and saponification, then cold rolling by a continuous rolling mill set, carrying out third annealing treatment to obtain a hollow billet with the Rockwell hardness of HRC25, and finally carrying out correction treatment to obtain the hollow steel. Wherein, the annealing treatment for the third time is that the temperature of the steel is raised to 680 ℃ within 60min, the temperature is kept for 5h, and then the steel is naturally cooled to 300 ℃.
Example 7:
shearing a steel material with the model of ZK23CrNi3Mo, heating the steel material as a blank to 1210 ℃, performing continuous spheroidizing annealing twice after center perforation to reduce the Rockwell hardness of the steel material to HRC18, performing acid pickling, phosphorization and saponification, performing cold rolling by using a continuous rolling mill set, performing acid pickling, phosphorization and saponification after cold rolling, performing cold drawing treatment, performing third annealing treatment, obtaining a hollow billet with the Rockwell hardness of HRC20 after the third annealing treatment, and finally performing correction treatment to obtain the hollow steel. Wherein, the third annealing treatment is that the temperature of the steel is raised to 670 ℃ within 60min, the temperature is kept for 6h, and then the steel is naturally cooled to 300 ℃.
Comparative example 1:
the difference from example 1 is only that the annealing treatment is performed only once after the heating treatment.
Comparative example 2:
the only difference from example 1 is that the annealing treatment was not performed after the heating treatment.
The steel materials obtained in comparative examples 1 and 2 have a cracking phenomenon in both steel materials after cold rolling because the hardness cannot satisfy the conditions of cold rolling, and the cracking phenomenon of the steel material in comparative example 2 is particularly serious. In examples 1 to 7, the steel material was annealed twice in succession, which not only prevented the steel pipe from cracking, but also made it easier to process as the hardness of the steel material decreased, so that the stability of the finally obtained hollow steel was greatly improved, thereby increasing the service life of the hollow steel pipe of the drill rod.
The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.
While the invention has been described in detail and with reference to specific embodiments thereof, it will be apparent to one skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope thereof.
Claims (9)
1. The processing method of the hollow steel pipe of the drill rod is characterized by comprising a first annealing treatment, a second annealing treatment, a cold rolling treatment and a third annealing treatment in sequence, wherein the first two annealing treatments are the same as the third annealing treatment.
2. The method as claimed in claim 1, wherein the first annealing treatment, the second annealing treatment and the third annealing treatment are all carried out at 650-.
3. The method for processing the hollow steel pipe of the drill rod as claimed in claim 1 or 2, wherein the first annealing treatment, the second annealing treatment and the third annealing treatment are all performed by heating the steel to 650-.
4. A method of working a hollow steel pipe for a drill rod as set forth in claim 3, wherein the Rockwell hardness of the steel material after the second annealing treatment is 16 to 20 HRC.
5. A method of working a hollow steel pipe for a drill rod according to claim 3, wherein the Rockwell hardness of the steel after the third annealing treatment is 19 to 25 HRC.
6. The method as claimed in claim 1, wherein the first annealing treatment comprises heating and piercing the steel at 1180-1220 ℃.
7. The method of claim 1, further comprising a pickling process between the second annealing process and the cold rolling process.
8. A method of processing a hollow steel pipe for a drill rod according to claim 1 or 7, further comprising a phosphating treatment between the second annealing treatment and the cold rolling treatment.
9. The method of claim 8, further comprising a saponification treatment between the second annealing treatment and the cold rolling treatment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010880587.5A CN112317540A (en) | 2020-08-27 | 2020-08-27 | Method for processing hollow steel pipe of drill rod |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010880587.5A CN112317540A (en) | 2020-08-27 | 2020-08-27 | Method for processing hollow steel pipe of drill rod |
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| CN112317540A true CN112317540A (en) | 2021-02-05 |
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| CN202010880587.5A Pending CN112317540A (en) | 2020-08-27 | 2020-08-27 | Method for processing hollow steel pipe of drill rod |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113245369A (en) * | 2021-05-19 | 2021-08-13 | 张家港保税区恒隆钢管有限公司 | Manufacturing process of pipe for PMMA reactor |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08209244A (en) * | 1995-02-07 | 1996-08-13 | Kawasaki Steel Corp | Production of pipe excellent in workability |
| JP2005256141A (en) * | 2004-03-15 | 2005-09-22 | Jfe Steel Kk | Method for manufacturing high-strength steel sheet superior in hole expandability |
| JP2006124770A (en) * | 2004-10-28 | 2006-05-18 | Jfe Steel Kk | Method for manufacturing ferritic stainless steel sheet |
| CN102626723A (en) * | 2012-04-17 | 2012-08-08 | 常熟市旋力轴承钢管有限公司 | Method for manufacturing steel pipe for bearing ring |
| CN104338781A (en) * | 2013-07-31 | 2015-02-11 | 无锡大金高精度冷拔钢管有限公司 | Method for manufacturing high-hardness cold-drawn steel tube |
| CN107138533A (en) * | 2017-07-13 | 2017-09-08 | 射洪县才伦建材有限责任公司 | A kind of high steel pipe processing method of lumber recovery |
| CN108559913A (en) * | 2018-05-16 | 2018-09-21 | 浙江健力股份有限公司 | A kind of GCr15 Steel Pipe For Bearings and its preparation process |
| CN109261743A (en) * | 2018-07-27 | 2019-01-25 | 柳州市横阳机械有限公司 | A kind of processing method of cold tube rolling |
-
2020
- 2020-08-27 CN CN202010880587.5A patent/CN112317540A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08209244A (en) * | 1995-02-07 | 1996-08-13 | Kawasaki Steel Corp | Production of pipe excellent in workability |
| JP2005256141A (en) * | 2004-03-15 | 2005-09-22 | Jfe Steel Kk | Method for manufacturing high-strength steel sheet superior in hole expandability |
| JP2006124770A (en) * | 2004-10-28 | 2006-05-18 | Jfe Steel Kk | Method for manufacturing ferritic stainless steel sheet |
| CN102626723A (en) * | 2012-04-17 | 2012-08-08 | 常熟市旋力轴承钢管有限公司 | Method for manufacturing steel pipe for bearing ring |
| CN104338781A (en) * | 2013-07-31 | 2015-02-11 | 无锡大金高精度冷拔钢管有限公司 | Method for manufacturing high-hardness cold-drawn steel tube |
| CN107138533A (en) * | 2017-07-13 | 2017-09-08 | 射洪县才伦建材有限责任公司 | A kind of high steel pipe processing method of lumber recovery |
| CN108559913A (en) * | 2018-05-16 | 2018-09-21 | 浙江健力股份有限公司 | A kind of GCr15 Steel Pipe For Bearings and its preparation process |
| CN109261743A (en) * | 2018-07-27 | 2019-01-25 | 柳州市横阳机械有限公司 | A kind of processing method of cold tube rolling |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113245369A (en) * | 2021-05-19 | 2021-08-13 | 张家港保税区恒隆钢管有限公司 | Manufacturing process of pipe for PMMA reactor |
| CN113245369B (en) * | 2021-05-19 | 2022-08-09 | 张家港保税区亚鑫精密制管有限公司 | Manufacturing process of pipe for PMMA reactor |
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