CN113199212A - Forging process for stainless steel gasoline 350bar high-pressure oil rail - Google Patents
Forging process for stainless steel gasoline 350bar high-pressure oil rail Download PDFInfo
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- CN113199212A CN113199212A CN202110476664.5A CN202110476664A CN113199212A CN 113199212 A CN113199212 A CN 113199212A CN 202110476664 A CN202110476664 A CN 202110476664A CN 113199212 A CN113199212 A CN 113199212A
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- forging
- pressure oil
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- 350bar
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- 238000005242 forging Methods 0.000 title claims abstract description 47
- 238000000034 method Methods 0.000 title claims abstract description 30
- 229910001220 stainless steel Inorganic materials 0.000 title claims abstract description 29
- 239000010935 stainless steel Substances 0.000 title claims abstract description 29
- 238000007689 inspection Methods 0.000 claims abstract description 33
- 239000002253 acid Substances 0.000 claims abstract description 30
- 238000010438 heat treatment Methods 0.000 claims abstract description 19
- 238000001816 cooling Methods 0.000 claims abstract description 16
- 239000002994 raw material Substances 0.000 claims abstract description 13
- 239000006104 solid solution Substances 0.000 claims abstract description 12
- 239000000463 material Substances 0.000 claims abstract description 9
- 238000005422 blasting Methods 0.000 claims abstract description 7
- 238000004140 cleaning Methods 0.000 claims abstract description 7
- 238000004806 packaging method and process Methods 0.000 claims abstract description 6
- 238000005554 pickling Methods 0.000 claims abstract description 6
- 238000009966 trimming Methods 0.000 claims abstract description 6
- 239000000243 solution Substances 0.000 claims abstract description 4
- 238000005406 washing Methods 0.000 claims description 27
- 239000008235 industrial water Substances 0.000 claims description 15
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims description 9
- 229910017604 nitric acid Inorganic materials 0.000 claims description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 9
- 239000008367 deionised water Substances 0.000 claims description 6
- 229910021641 deionized water Inorganic materials 0.000 claims description 6
- 238000001035 drying Methods 0.000 claims description 6
- 238000005260 corrosion Methods 0.000 claims description 5
- 230000007797 corrosion Effects 0.000 claims description 5
- 238000002161 passivation Methods 0.000 claims description 5
- 238000001125 extrusion Methods 0.000 claims description 4
- 230000035515 penetration Effects 0.000 claims description 4
- 238000005520 cutting process Methods 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- 239000000126 substance Substances 0.000 claims description 3
- 206010070834 Sensitisation Diseases 0.000 abstract description 4
- 230000008313 sensitization Effects 0.000 abstract description 4
- 230000005389 magnetism Effects 0.000 abstract description 2
- 239000002283 diesel fuel Substances 0.000 description 3
- 239000000446 fuel Substances 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 239000006247 magnetic powder Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000004506 ultrasonic cleaning Methods 0.000 description 1
Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
-
- 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
- C21D6/00—Heat treatment of ferrous alloys
-
- 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
- C21D7/00—Modifying the physical properties of iron or steel by deformation
- C21D7/13—Modifying the physical properties of iron or steel by deformation by hot working
-
- 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
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
- C23C22/06—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6
- C23C22/34—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6 containing fluorides or complex fluorides
-
- 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
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F17/00—Multi-step processes for surface treatment of metallic material involving at least one process provided for in class C23 and at least one process covered by subclass C21D or C22F or class C25
-
- 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
-
- 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
- C21D2261/00—Machining or cutting being involved
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Crystallography & Structural Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Forging (AREA)
Abstract
The invention relates to a process for forging a stainless steel gasoline 350bar high-pressure oil rail, which comprises the following steps: (1) inspecting the raw materials; (2) forging the raw materials qualified in inspection to prepare the high-pressure oil rail, and specifically comprises the following steps: blanking, heating to prepare a blank, pre-forging, finish forging, trimming, air cooling, shot blasting, solid solution, hot heading and acid pickling; (3) and (5) carrying out product inspection on the forged product, and cleaning and packaging the product which is qualified through inspection. The process of the invention adopts specific processes of air cooling, solution treatment and penetrant inspection to ensure the product performance aiming at the characteristics of sensitization temperature of the stainless steel material, no magnetism of the material and the like.
Description
Technical Field
The invention relates to the technical field of high-pressure oil rail manufacturing, in particular to a forging process for a stainless steel gasoline 350bar high-pressure oil rail.
Background
At present, gasoline engine stainless steel high-pressure oil rails are all formed by assembling and welding parts, and with the gradual increase of the national requirements on automobile emission, various automobile manufacturers meet the emission requirements by reducing the discharge capacity and increasing the working pressure of an engine. Along with the improvement of the working pressure of the engine, the reliability and fatigue resistance of the oil rail in an assembly welding mode can be greatly reduced under the condition that the working pressure is more than 250bar, and the threat to a user can be brought. Therefore, most of the oil rails with the working pressure of more than 250bar adopt the mode of integral forging machining. For example, the operating pressure of the fuel system of the EA888 engine of China, which is popular in China, is 350bar, and the high-pressure fuel rail is added to the integral stainless steel forging machine. At present, most oil rail forging manufacturers continue to use the diesel oil rail forging process, so that the durability and machining performance of products are reduced.
Disclosure of Invention
The invention aims to solve the problems and provide a forging process for a stainless steel gasoline 350bar high-pressure oil rail, so that the stainless steel gasoline high-pressure oil rail meeting 350bar high pressure can be obtained, and the practical application and use requirements can be met.
The purpose of the invention is realized by the following technical scheme:
a forging process for a stainless steel gasoline 350bar high-pressure oil rail comprises the following steps:
(1) inspecting the raw materials;
(2) forging the raw materials qualified in inspection to prepare the high-pressure oil rail, and specifically comprises the following steps: blanking, heating to prepare a blank, pre-forging, finish forging, trimming, air cooling, shot blasting, solid solution, hot heading and acid pickling;
(3) and (5) carrying out product inspection on the forged product, and cleaning and packaging the product which is qualified through inspection.
The process of the invention adopts specific processes of air cooling, solution treatment and penetrant inspection to ensure the product performance aiming at the characteristics of sensitization temperature of the stainless steel material, no magnetism of the material and the like.
Further, the step (1) of inspecting the raw material comprises macrostructure inspection, non-metallic inclusion inspection and chemical composition analysis.
Further, the blanking in the step (2) is to cut and blank the bar stock according to the standard length by a circular saw or a band saw.
Further, the heating blank making temperature in the step (2) is 1100-1300 ℃, preferably 1200 ℃.
Further, the product shape is forged in the pre-forging and the finish forging, and the trimming is to cut off the product flash.
Further, air cooling is adopted in the step (2) to accelerate cooling and increase the grain size of the solution treatment to be controlled to be above grade 6, and the hardness of the rail body is HB 140-190.
Further, the shot blasting is to remove black skin on the surface of the product, and the solid solution is carried out in a tunnel furnace.
Further, the hot pier is locally hardened through local material extrusion to achieve local hardness higher than that of the rail body, and the hardness is more than HB 210.
Further, the corrosion resistance of the rail body is improved by carrying out surface passivation treatment through acid washing, and the specific flow of the acid washing is as follows:
(1) acid washing with 15-20% HNO3+ 5-8% HF and industrial water for 25min without heating;
(2) acid washing with 15-20% HNO3+ 5-8% HF and industrial water for 25min without heating;
(3) washing with industrial water for 3-5min, and removing acid;
(4) passivating with 35-40% HNO3+ 8-10% HF for 30min without heating;
(5) washing with industrial water for 3-5min, and removing acid;
(6) washing with industrial water for 3-5min, and removing acid;
(7) washing with water, deionized water, and removing acid for 3-5 min;
(8) washing with hot water, heating with deionized water to 80-90 deg.C for 3-5min, and drying and dewatering;
(9) and (5) drying and naturally airing.
Further, the forged product is subjected to product inspection in a penetration flaw detection mode, and the product is cleaned by ultrasonic waves.
Compared with the prior art, the invention discloses a process for forging a stainless steel gasoline high-pressure oil rail, which divides the forging of the oil rail into four parts, namely, raw material inspection, forging, product inspection, cleaning and packaging. The process is used for forging the stainless steel gasoline high-pressure oil rail, the sensitization temperature of the stainless steel is 480-820 ℃, air cooling is adopted to accelerate cooling, the grain size of solid solution treatment is increased and is controlled to be more than 6 grades, the hardness of a rail body is HB140-190, the stainless steel is not magnetic after solid solution treatment and cannot be detected by a diesel oil rail magnetic powder inspection method, the surface quality is detected by a penetration inspection method, the local hardness is higher than that of the rail body through local material extrusion hardening, the hardness is more than HB210, and the corrosion resistance of the rail body is improved through surface passivation treatment of acid washing on the rail body.
Drawings
FIG. 1 is a process flow diagram of the present invention.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments.
Referring to fig. 1, a forging process for a stainless steel gasoline 350bar high-pressure oil rail comprises the following steps:
(1) inspecting the raw materials;
(2) forging the raw materials qualified in inspection to prepare the high-pressure oil rail, and specifically comprises the following steps: blanking, heating to prepare a blank, pre-forging, finish forging, trimming, air cooling, shot blasting, solid solution, hot heading and acid pickling;
(3) and (5) carrying out product inspection on the forged product, and cleaning and packaging the product which is qualified through inspection.
The step (1) of inspecting the raw materials comprises macrostructure inspection, non-metallic inclusion inspection and chemical composition analysis.
And (2) cutting and blanking the bar stock according to the standard length by using a circular saw or a band saw.
The heating and blank-making temperature in the step (2) is 1200 ℃.
And performing pre-forging and finish forging to obtain the shape of the product, wherein the trimming is to cut off the flash of the product.
And (2) adopting air cooling to accelerate cooling and increasing the grain size of the solid solution treatment to be controlled to be above grade 6, wherein the hardness of the rail body is HB 140-190.
The shot blasting is to remove black skin on the surface of the product, and the solid solution is carried out in a tunnel furnace.
The hot pier is extruded and hardened by local materials to reach local hardness higher than that of the rail body, and the hardness is higher than HB 210.
The corrosion resistance of the rail body is improved by carrying out surface passivation treatment through acid washing, and the specific flow of the acid washing is as follows:
(1) acid washing with 15-20% HNO3+ 5-8% HF and industrial water for 25min without heating;
(2) acid washing with 15-20% HNO3+ 5-8% HF and industrial water for 25min without heating;
(3) washing with industrial water for 3-5min, and removing acid;
(4) passivating with 35-40% HNO3+ 8-10% HF for 30min without heating;
(5) washing with industrial water for 3-5min, and removing acid;
(6) washing with industrial water for 3-5min, and removing acid;
(7) washing with water, deionized water, and removing acid for 3-5 min;
(8) washing with hot water, heating with deionized water to 80-90 deg.C for 3-5min, and drying and dewatering;
(9) and (5) drying and naturally airing.
And (3) inspecting the forged product in a penetrant inspection mode, and cleaning the product by ultrasonic cleaning. The forging of the oil rail is divided into four blocks, namely raw material inspection, forging, product inspection, cleaning and packaging.
The process is used for forging the stainless steel gasoline high-pressure oil rail, the sensitization temperature of the stainless steel is 480-820 ℃, air cooling is adopted to accelerate cooling, the grain size of solid solution treatment is increased and is controlled to be more than 6 grades, the hardness of a rail body is HB140-190, the stainless steel is not magnetic after solid solution treatment and cannot be detected by a diesel oil rail magnetic powder inspection method, the surface quality is detected by a penetration inspection method, the local hardness is higher than that of the rail body through local material extrusion hardening, the hardness is more than HB210, and the corrosion resistance of the rail body is improved through surface passivation treatment of acid washing on the rail body.
The embodiments described above are described to facilitate an understanding and use of the invention by those skilled in the art. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above embodiments, and those skilled in the art should make improvements and modifications within the scope of the present invention based on the disclosure of the present invention.
Claims (10)
1. A forging process for a stainless steel gasoline 350bar high-pressure oil rail is characterized by comprising the following steps:
(1) inspecting the raw materials;
(2) forging the raw materials qualified in inspection to prepare the high-pressure oil rail, and specifically comprises the following steps: blanking, heating to prepare a blank, pre-forging, finish forging, trimming, air cooling, shot blasting, solid solution, hot heading and acid pickling;
(3) and (5) carrying out product inspection on the forged product, and cleaning and packaging the product which is qualified through inspection.
2. The forging process for the stainless steel gasoline 350bar high-pressure oil rail according to claim 1, wherein the raw material inspection in the step (1) comprises macrostructure inspection, non-metallic inclusion inspection and chemical composition analysis.
3. The forging process for the stainless steel gasoline 350bar high-pressure oil rail as claimed in claim 1, wherein the blanking in the step (2) is to cut and blank the bar stock according to a standard length by a circular saw or a band saw.
4. The forging process for the stainless steel gasoline 350bar high-pressure oil rail as claimed in claim 1, wherein the heating and blank-making temperature in the step (2) is 1100-1300.
5. The forging process for the stainless steel gasoline 350bar high-pressure oil rail as claimed in claim 1, wherein the pre-forging and the finish-forging are used for forging the shape of a product, and the edge cutting is used for cutting off flash of the product.
6. The forging process of the high-pressure oil rail for the stainless steel gasoline at 350bar according to claim 1, wherein the air cooling is adopted in the step (2) to accelerate cooling and increase the grain size of the solution treatment to be controlled to be more than 6 grades, and the hardness of the rail body is HB 140-190.
7. The forging process for the stainless steel gasoline 350bar high-pressure oil rail as claimed in claim 1, wherein the shot blasting is to remove black skin on the surface of a product, and the solid solution is carried out in a tunnel furnace.
8. The forging process for the stainless steel gasoline 350bar high-pressure oil rail as claimed in claim 1, wherein the hot pier is locally hardened by local material extrusion to achieve local hardness higher than that of a rail body, and the hardness is higher than HB 210.
9. The forging process for the stainless steel gasoline 350bar high-pressure oil rail according to claim 1, wherein the corrosion resistance of a rail body is improved by carrying out surface passivation treatment through acid pickling, and the specific flow of the acid pickling is as follows:
(1) acid washing with 15-20% HNO3+ 5-8% HF and industrial water for 25min without heating;
(2) acid washing with 15-20% HNO3+ 5-8% HF and industrial water for 25min without heating;
(3) washing with industrial water for 3-5min, and removing acid;
(4) passivating with 35-40% HNO3+ 8-10% HF for 30min without heating;
(5) washing with industrial water for 3-5min, and removing acid;
(6) washing with industrial water for 3-5min, and removing acid;
(7) washing with water, deionized water, and removing acid for 3-5 min;
(8) washing with hot water, heating with deionized water to 80-90 deg.C for 3-5min, and drying and dewatering;
(9) and (5) drying and naturally airing.
10. The forging process of the stainless steel gasoline 350bar high-pressure oil rail according to claim 1, wherein a forged product is subjected to product inspection in a penetration inspection mode, and is cleaned by ultrasonic waves.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110476664.5A CN113199212A (en) | 2021-04-29 | 2021-04-29 | Forging process for stainless steel gasoline 350bar high-pressure oil rail |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110476664.5A CN113199212A (en) | 2021-04-29 | 2021-04-29 | Forging process for stainless steel gasoline 350bar high-pressure oil rail |
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| Publication Number | Publication Date |
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| CN113199212A true CN113199212A (en) | 2021-08-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110476664.5A Pending CN113199212A (en) | 2021-04-29 | 2021-04-29 | Forging process for stainless steel gasoline 350bar high-pressure oil rail |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1608144A (en) * | 2001-12-25 | 2005-04-20 | 株式会社帕克 | Method of surface-finishing stainless steel after descaling |
| CN101787525A (en) * | 2009-12-24 | 2010-07-28 | 四川省广汉华威铝业有限公司 | Stainless steel passivation process |
| CN103313810A (en) * | 2010-11-10 | 2013-09-18 | 株式会社托普拉 | Process for manufacture of fastening component made from aluminum-based alloy, and fastening component made from aluminum-based alloy |
| KR101788466B1 (en) * | 2016-08-10 | 2017-10-19 | 현대비앤지스틸 주식회사 | Method of manufacturing stainless steel with excellent surface gloss and corrosion resistance |
| CN107287404A (en) * | 2017-07-01 | 2017-10-24 | 贵州航天精工制造有限公司 | A kind of GH159 bolt heads processing method |
| CN108406315A (en) * | 2018-04-27 | 2018-08-17 | 上海众源燃油分配器制造有限公司 | A kind of gasoline high pressure oil rail forging system and technique |
| CN109136851A (en) * | 2018-09-01 | 2019-01-04 | 华迪钢业集团有限公司 | Stainless steel tube corrosion-resistant post-treatment process |
-
2021
- 2021-04-29 CN CN202110476664.5A patent/CN113199212A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1608144A (en) * | 2001-12-25 | 2005-04-20 | 株式会社帕克 | Method of surface-finishing stainless steel after descaling |
| CN101787525A (en) * | 2009-12-24 | 2010-07-28 | 四川省广汉华威铝业有限公司 | Stainless steel passivation process |
| CN103313810A (en) * | 2010-11-10 | 2013-09-18 | 株式会社托普拉 | Process for manufacture of fastening component made from aluminum-based alloy, and fastening component made from aluminum-based alloy |
| KR101788466B1 (en) * | 2016-08-10 | 2017-10-19 | 현대비앤지스틸 주식회사 | Method of manufacturing stainless steel with excellent surface gloss and corrosion resistance |
| CN107287404A (en) * | 2017-07-01 | 2017-10-24 | 贵州航天精工制造有限公司 | A kind of GH159 bolt heads processing method |
| CN108406315A (en) * | 2018-04-27 | 2018-08-17 | 上海众源燃油分配器制造有限公司 | A kind of gasoline high pressure oil rail forging system and technique |
| CN109136851A (en) * | 2018-09-01 | 2019-01-04 | 华迪钢业集团有限公司 | Stainless steel tube corrosion-resistant post-treatment process |
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Application publication date: 20210803 |
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