CN109490302A - A kind of test method of the austenite grain of midium-carbon steel martensitic structure - Google Patents
A kind of test method of the austenite grain of midium-carbon steel martensitic structure Download PDFInfo
- Publication number
- CN109490302A CN109490302A CN201811335718.0A CN201811335718A CN109490302A CN 109490302 A CN109490302 A CN 109490302A CN 201811335718 A CN201811335718 A CN 201811335718A CN 109490302 A CN109490302 A CN 109490302A
- Authority
- CN
- China
- Prior art keywords
- sample
- austenite grain
- midium
- test method
- carbon steel
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/286—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q involving mechanical work, e.g. chopping, disintegrating, compacting, homogenising
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/32—Polishing; Etching
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N2021/8477—Investigating crystals, e.g. liquid crystals
Landscapes
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Sampling And Sample Adjustment (AREA)
- Investigating And Analyzing Materials By Characteristic Methods (AREA)
Abstract
The invention discloses a kind of test methods of the austenite grain of midium-carbon steel martensitic structure, steps are as follows: the preparation of sample: being machined into from conditioned treated holddown spring product piece ontology and cuts lower sample, the etch of sample: corrosive agent is put into beaker, and sample is dipped in etchant solution, it places the beaker on thermostatic oven, solution is set to be in slight boiling condition, sample is taken out after boiling 2.5 hours, Metallographic Analysis: the grain size of sample is observed under 100 times using metallographic optical microscopy and shoots metallograph, its austenite grain size and autstenitic grain size are counted using image analysis software.Using test method of the invention, the original austenite grain of martensitic structure can be made clear and completely shown, it can clearly judge whether its sample coarse grains or has mixed crystal, thus to optimize heat treatment process, ensure that its performance is able to satisfy actual condition use, the rank of mean grain size can be accurately assessed.
Description
Technical field
The present invention relates to the austenite grain field of display technology of martensitic stain less steel, specifically a kind of midium-carbon steel geneva
The test method of the austenite grain of body tissue.
Background technique
Country is just greatly developing high-end manufacturing equipment, such as the manufacture of clean energy resource nuclear power main equipment, to nuclear power main equipment work
The guarantee of skill design and performance is put forward higher requirements, and wherein critical component holddown spring uses martensitic stain less steel, to grain size
Rank has performance assessment criteria.
The performance of the component is with metallurgy, and forging and stamping, the processing technologys such as heat treatment are related, for materialogy, the performance of material
To be determined by the materials microstructure and autstenitic grain size, wherein autstenitic grain size determine the performance of the material it is main because
Element, the method that toughness of material and intensity can be improved in refinement austenite.
Fining austenite grains are discussed, are to want suitable method first to measure its austenite grain rank,
Autstenitic grain size is measured using oxidizing process by GB/T6394-2002, makes its surface oxidation, then gently throws sample table
Its autstenitic grain size is observed in face, and the method is complicated for operation, and observation is not also prior austenite grain size；Using iron chloride+ethyl alcohol
Aqueous solution and the corrosion of picric acid hydrochloride alcohol solution, tissue and crystal boundary are corroded simultaneously and come out, and crystal boundary is also unobvious, to grading
Process brings disturbing factor, needs a kind of suitable caustic solution to show the autstenitic grain size of midium-carbon steel martensitic structure.
Summary of the invention
The purpose of the present invention is to provide a kind of test methods of the austenite grain of midium-carbon steel martensitic structure, with solution
Certainly the problems mentioned above in the background art.
To achieve the above object, the invention provides the following technical scheme:
A kind of test method of the austenite grain of midium-carbon steel martensitic structure, steps are as follows:
(1), the preparation of sample:
It is machined into from conditioned treated holddown spring product piece ontology and cuts lower sample, sample is successively passed through
The sand paper grinding for crossing 80#, 280#, 600#, 1000#, the sample after grinding is placed on velvet polishing cloth and is polished, and Buddha's warrior attendant is added
Stone polishing agent, acquisition is clean smooth, not the burnishing surface of scratch；
(2), the etch of sample:
Corrosive agent is put into beaker, and sample is dipped in etchant solution, places the beaker on thermostatic oven, makes solution
In slight boiling condition, sample is taken out after boiling 2.5 hours, with clear water rinse surface, finally with alcohol rinse and use hair dryer
Drying, the sample after corrosion is placed on velvet polishing cloth and is gently polished, while adding a small amount of water, keeps the surface of sample clean；
(3), Metallographic Analysis:
The grain size of sample is observed under 100 times using metallographic optical microscopy and shoots metallograph, using image point
Analyse its austenite grain size of software statistics and autstenitic grain size.
As a further solution of the present invention: sample cuts the area that should avoid shearing, heat effect in the step (1)
Domain.
As a further solution of the present invention: changing one of sand paper every time in the step (1), sample is revolved along the face that grinds
It turn 90 degrees, obtained new polishing scratch is perpendicular to upper polishing scratch together and is covered.
As a further solution of the present invention: the beaker edge of distilled water the preparation of corrosive agent in the step (2): will be filled
Glass bar is poured slowly into nitric acid, and stirs evenly, and obtains aqueous solution of nitric acid.
As a further solution of the present invention: the proportion of distilled water and nitric acid is 6:4 in the aqueous solution of nitric acid.
As a further solution of the present invention: the diamond polishing agent being added in the step (1) is 0.5um.
As further scheme of the invention: the sample size is 10mm*10mm*27mm.
Compared with prior art, the beneficial effects of the present invention are: using test method of the invention, martensite can be made
The original austenite grain of tissue is clear and completely shows, can clearly judge its sample whether coarse grains or asking there are mixed crystal
Topic, thus to optimize heat treatment process, it is ensured that its performance is able to satisfy actual condition use, can accurately assess the grade of mean grain size
Not.
Specific embodiment
It should be noted that in the absence of conflict, the feature in embodiment and embodiment in the present invention can phase
Mutually combination.
Below in conjunction with embodiment, the present invention will be described in detail.
Embodiment one
A kind of test method of the austenite grain of midium-carbon steel martensitic structure, steps are as follows:
(1), the preparation of sample:
It is machined into from conditioned treated holddown spring product piece ontology and cuts lower sample, sample is successively passed through
The sand paper grinding for crossing 80#, 280#, 600#, 1000#, the sample after grinding is placed on velvet polishing cloth and is polished, and Buddha's warrior attendant is added
Stone polishing agent, acquisition is clean smooth, not the burnishing surface of scratch；
(2), the etch of sample:
Corrosive agent is put into beaker, and sample is dipped in etchant solution, places the beaker on thermostatic oven, makes solution
In slight boiling condition, sample is taken out after boiling 2.5 hours, with clear water rinse surface, finally with alcohol rinse and use hair dryer
Drying, the sample after corrosion is placed on velvet polishing cloth and is gently polished, while adding a small amount of water, keeps the surface of sample clean；
(3), Metallographic Analysis:
The grain size of sample is observed under 100 times using metallographic optical microscopy and shoots metallograph, using image point
Analyse its austenite grain size of software statistics and autstenitic grain size.
Sample cuts the region that should avoid shearing, heat effect in the step (1).
One of sand paper is changed every time in the step (1), and sample edge is ground into face and is rotated by 90 °, obtained new polishing scratch is vertical
In upper polishing scratch together and covered.
Embodiment two
A kind of test method of the austenite grain of midium-carbon steel martensitic structure, steps are as follows:
(1), the preparation of sample:
It is machined into from conditioned treated holddown spring product piece ontology and cuts lower sample, sample is successively passed through
The sand paper grinding for crossing 80#, 280#, 600#, 1000#, the sample after grinding is placed on velvet polishing cloth and is polished, and Buddha's warrior attendant is added
Stone polishing agent, acquisition is clean smooth, not the burnishing surface of scratch；
(2), the etch of sample:
Corrosive agent is put into beaker, and sample is dipped in etchant solution, places the beaker on thermostatic oven, makes solution
In slight boiling condition, sample is taken out after boiling 2.5 hours, with clear water rinse surface, finally with alcohol rinse and use hair dryer
Drying, the sample after corrosion is placed on velvet polishing cloth and is gently polished, while adding a small amount of water, keeps the surface of sample clean；
(3), Metallographic Analysis:
The grain size of sample is observed under 100 times using metallographic optical microscopy and shoots metallograph, using image point
Analyse its austenite grain size of software statistics and autstenitic grain size.
Sample cuts the region that should avoid shearing, heat effect in the step (1).
One of sand paper is changed every time in the step (1), and sample edge is ground into face and is rotated by 90 °, obtained new polishing scratch is vertical
In upper polishing scratch together and covered.
The preparation of corrosive agent in the step (2): the beaker for filling distilled water is poured slowly into nitric acid along glass bar, and is stirred
It mixes uniformly, obtains aqueous solution of nitric acid.
The proportion of distilled water and nitric acid is 6: 4 in the aqueous solution of nitric acid.
Embodiment three
A kind of test method of the austenite grain of midium-carbon steel martensitic structure, steps are as follows:
(1), the preparation of sample:
It is machined into from conditioned treated holddown spring product piece ontology and cuts lower sample, sample is successively passed through
The sand paper grinding for crossing 80#, 280#, 600#, 1000#, the sample after grinding is placed on velvet polishing cloth and is polished, and Buddha's warrior attendant is added
Stone polishing agent, acquisition is clean smooth, not the burnishing surface of scratch；
(2), the etch of sample:
Corrosive agent is put into beaker, and sample is dipped in etchant solution, places the beaker on thermostatic oven, makes solution
In slight boiling condition, sample is taken out after boiling 2.5 hours, with clear water rinse surface, finally with alcohol rinse and use hair dryer
Drying, the sample after corrosion is placed on velvet polishing cloth and is gently polished, while adding a small amount of water, keeps the surface of sample clean；
(3), Metallographic Analysis:
The grain size of sample is observed under 100 times using metallographic optical microscopy and shoots metallograph, using image point
Analyse its austenite grain size of software statistics and autstenitic grain size.
Sample cuts the region that should avoid shearing, heat effect in the step (1).
One of sand paper is changed every time in the step (1), and sample edge is ground into face and is rotated by 90 °, obtained new polishing scratch is vertical
In upper polishing scratch together and covered.
The preparation of corrosive agent in the step (2): the beaker for filling distilled water is poured slowly into nitric acid along glass bar, and is stirred
It mixes uniformly, obtains aqueous solution of nitric acid.
The proportion of distilled water and nitric acid is 6: 4 in the aqueous solution of nitric acid.
The diamond polishing agent being added in the step (1) is 0.5um.
The sample size is 10mm*10mm*27mm.
Using test method of the invention, the original austenite grain of martensitic structure can be made clear and complete aobvious
It is existing, it can clearly judge whether its sample coarse grains or has mixed crystal, thus to optimize heat treatment process, it is ensured that its property
It can be able to satisfy actual condition use, the rank of mean grain size can be accurately assessed.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Within mind and principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (7)
1. a kind of test method of the austenite grain of midium-carbon steel martensitic structure, which is characterized in that steps are as follows:
(1), the preparation of sample:
It is machined into from conditioned treated holddown spring product piece ontology and cuts lower sample, sample is successively passed through
The sand paper of 80#, 280#, 600#, 1000# are ground, and the sample after grinding is placed on velvet polishing cloth and is polished, and diamond is added
Polishing agent, acquisition is clean smooth, not the burnishing surface of scratch；
(2), the etch of sample:
Corrosive agent is put into beaker, and sample is dipped in etchant solution, places the beaker on thermostatic oven, is in solution
Slight boiling condition takes out sample after boiling 2.5 hours, rinses surface with clear water, finally dries up with alcohol rinse and using hair dryer,
Sample after corrosion is placed on velvet polishing cloth and is gently polished, while adding a small amount of water, keeps the surface of sample clean；
(3), Metallographic Analysis:
The grain size of sample is observed under 100 times using metallographic optical microscopy and shoots metallograph, it is soft using image analysis
Part counts its austenite grain size and autstenitic grain size.
2. a kind of test method of the austenite grain of midium-carbon steel martensitic structure according to claim 1, feature
It is, sample cuts the region that should avoid shearing, heat effect in the step (1).
3. a kind of test method of the austenite grain of midium-carbon steel martensitic structure according to claim 2, feature
Be, change one of sand paper every time in the step (1), sample is rotated by 90 ° along grinding face, obtained new polishing scratch perpendicular to
Upper polishing scratch together is simultaneously covered.
4. a kind of test method of the austenite grain of midium-carbon steel martensitic structure according to claim 1, feature
It is, the preparation of corrosive agent in the step (2): the beaker for filling distilled water is poured slowly into nitric acid along glass bar, and is stirred
Uniformly, aqueous solution of nitric acid is obtained.
5. a kind of test method of the austenite grain of midium-carbon steel martensitic structure according to claim 4, feature
It is, the proportion of distilled water and nitric acid is 6: 4 in the aqueous solution of nitric acid.
6. a kind of test method of the austenite grain of midium-carbon steel martensitic structure according to claim 1, feature
It is, the diamond polishing agent being added in the step (1) is 0.5um.
7. a kind of test method of the austenite grain of midium-carbon steel martensitic structure according to claim 1, feature
It is, the sample size is 10mm*10mm*27mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811335718.0A CN109490302A (en) | 2018-11-11 | 2018-11-11 | A kind of test method of the austenite grain of midium-carbon steel martensitic structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811335718.0A CN109490302A (en) | 2018-11-11 | 2018-11-11 | A kind of test method of the austenite grain of midium-carbon steel martensitic structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109490302A true CN109490302A (en) | 2019-03-19 |
Family
ID=65695495
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811335718.0A Pending CN109490302A (en) | 2018-11-11 | 2018-11-11 | A kind of test method of the austenite grain of midium-carbon steel martensitic structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109490302A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110749718A (en) * | 2019-10-25 | 2020-02-04 | 成都先进金属材料产业技术研究院有限公司 | Dendritic crystal corrosive agent and corrosion method for maraging stainless steel |
| CN113063707A (en) * | 2021-03-12 | 2021-07-02 | 浙江美力科技股份有限公司 | Corrosion method for prior austenite grain size of tempered troostite and martensite structure |
| CN113218736A (en) * | 2021-05-07 | 2021-08-06 | 大唐锅炉压力容器检验中心有限公司 | Original austenite grain boundary corrosion method of martensitic stainless steel for steam turbine bolt |
| CN115683796A (en) * | 2022-11-02 | 2023-02-03 | 上海电气上重铸锻有限公司 | Method for testing twin crystal grain size of austenitic stainless steel |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0551800A (en) * | 1991-08-20 | 1993-03-02 | Daido Steel Co Ltd | Method for revealing grain boundary of steel material sample |
| CN1671874A (en) * | 2002-01-24 | 2005-09-21 | 住友电气工业株式会社 | Steel wire for heat-resistant spring, heat-resistant spring and method for manufacturing heat-resistant spring |
| CN102620971A (en) * | 2012-03-20 | 2012-08-01 | 上海大学 | A sample preparation method for studying Cu precipitates in steel by extraction replica |
| CN103018141A (en) * | 2012-11-29 | 2013-04-03 | 燕山大学 | Original crystalline grain displaying agent of high-alloy and low-carbon martensite steel and displaying method |
| CN103792128A (en) * | 2014-02-21 | 2014-05-14 | 山西太钢不锈钢股份有限公司 | Method for displaying two-phase grain boundary of duplex stainless steel |
| CN103983502A (en) * | 2014-06-10 | 2014-08-13 | 上海电气电站设备有限公司 | Metallographic corrosion method for clearly displaying 9-12% Cr heat-resistant steel original austenite grain boundary |
| CN104111230A (en) * | 2014-06-19 | 2014-10-22 | 中国科学院金属研究所 | Classified display and quantitative detection method for martensite and residual austenite in M-A island |
| CN104483179A (en) * | 2014-11-27 | 2015-04-01 | 中国科学院金属研究所 | Method for displaying original austenite grain boundaries of maraging stainless steel |
| CN105092437A (en) * | 2015-09-22 | 2015-11-25 | 中国第一重型机械股份公司 | Ultra-supercritical martensite heat resisting cast steel original austenite grain size display method |
| CN107860637A (en) * | 2017-11-09 | 2018-03-30 | 中国航发贵州黎阳航空动力有限公司 | A kind of preparation method of spring-like part metallographic specimen |
-
2018
- 2018-11-11 CN CN201811335718.0A patent/CN109490302A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0551800A (en) * | 1991-08-20 | 1993-03-02 | Daido Steel Co Ltd | Method for revealing grain boundary of steel material sample |
| CN1671874A (en) * | 2002-01-24 | 2005-09-21 | 住友电气工业株式会社 | Steel wire for heat-resistant spring, heat-resistant spring and method for manufacturing heat-resistant spring |
| CN102620971A (en) * | 2012-03-20 | 2012-08-01 | 上海大学 | A sample preparation method for studying Cu precipitates in steel by extraction replica |
| CN103018141A (en) * | 2012-11-29 | 2013-04-03 | 燕山大学 | Original crystalline grain displaying agent of high-alloy and low-carbon martensite steel and displaying method |
| CN103792128A (en) * | 2014-02-21 | 2014-05-14 | 山西太钢不锈钢股份有限公司 | Method for displaying two-phase grain boundary of duplex stainless steel |
| CN103983502A (en) * | 2014-06-10 | 2014-08-13 | 上海电气电站设备有限公司 | Metallographic corrosion method for clearly displaying 9-12% Cr heat-resistant steel original austenite grain boundary |
| CN104111230A (en) * | 2014-06-19 | 2014-10-22 | 中国科学院金属研究所 | Classified display and quantitative detection method for martensite and residual austenite in M-A island |
| CN104483179A (en) * | 2014-11-27 | 2015-04-01 | 中国科学院金属研究所 | Method for displaying original austenite grain boundaries of maraging stainless steel |
| CN105092437A (en) * | 2015-09-22 | 2015-11-25 | 中国第一重型机械股份公司 | Ultra-supercritical martensite heat resisting cast steel original austenite grain size display method |
| CN107860637A (en) * | 2017-11-09 | 2018-03-30 | 中国航发贵州黎阳航空动力有限公司 | A kind of preparation method of spring-like part metallographic specimen |
Non-Patent Citations (2)
| Title |
|---|
| 杨才福，张永权，王瑞珍编著: "《钒钢冶金原理与应用》", 30 June 2012, 北京：冶金工业出版社 * |
| 袁宏梅等: "高强度悬架弹簧钢丝的组织结构", 《金属热处理》 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110749718A (en) * | 2019-10-25 | 2020-02-04 | 成都先进金属材料产业技术研究院有限公司 | Dendritic crystal corrosive agent and corrosion method for maraging stainless steel |
| CN113063707A (en) * | 2021-03-12 | 2021-07-02 | 浙江美力科技股份有限公司 | Corrosion method for prior austenite grain size of tempered troostite and martensite structure |
| CN113218736A (en) * | 2021-05-07 | 2021-08-06 | 大唐锅炉压力容器检验中心有限公司 | Original austenite grain boundary corrosion method of martensitic stainless steel for steam turbine bolt |
| CN115683796A (en) * | 2022-11-02 | 2023-02-03 | 上海电气上重铸锻有限公司 | Method for testing twin crystal grain size of austenitic stainless steel |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109490302A (en) | A kind of test method of the austenite grain of midium-carbon steel martensitic structure | |
| CN105092437B (en) | Ultra supercritical martensite heat resisting cast steel original austenite grains degree display methods | |
| CN103792128B (en) | A kind of method of the biphase crystal boundary showing two phase stainless steel | |
| CN104483179B (en) | Method for displaying original austenite grain boundaries of maraging stainless steel | |
| CN102890027A (en) | Metallographic structure display method of interstitial free (IF) steel cold-rolled sheet containing titanium (Ti) | |
| CN109187152A (en) | It is a kind of for showing the corrosive agent and display methods of heat resisting steel original austenite crystal boundary | |
| CN103175726A (en) | Metallographic corrosion method for clearly displaying original austenite grain boundary of NiCrMoV type rotor steel | |
| CN101995349A (en) | Corrosive agent for metallographic structure of high-steel-grade pipeline steel and display method | |
| CN109142010B (en) | Method for detecting distribution and content of residual austenite in low-alloy structural steel | |
| CN104233301B (en) | Metallographic etchant used for HR-2 antihydrogen steel, and preparation method and corrosion method of metallographic etchant | |
| CN103163004A (en) | Austenite crystal boundary display method under condition of high-temperature deformation of medium-carbon microalloyed steel | |
| CN104562012A (en) | Iron-base high-temperature alloy sample metallographic etching solution and etching method | |
| CN109991254A (en) | A kind of preparation method of pure iron EBSD sample | |
| CN103983502A (en) | Metallographic corrosion method for clearly displaying 9-12% Cr heat-resistant steel original austenite grain boundary | |
| CN107941582A (en) | A kind of metallographic specimen preparation method | |
| CN107574439A (en) | Etching agent for displaying original austenite grain boundary of FB2 steel, preparation method and application | |
| CN106596234A (en) | Method for displaying original austenite grain boundary of low-carbon microalloyed steel | |
| CN105738184B (en) | The application method for the etchant that manganese steel austenite grain boundary is shown | |
| CN110749718A (en) | Dendritic crystal corrosive agent and corrosion method for maraging stainless steel | |
| CN114113086B (en) | Preparation and use of a high-carbon high-alloy steel isothermal quenching structure corrosive agent | |
| CN104651841A (en) | Corrosive liquid and corrosion method for performing metallographic analysis on nitrided steel | |
| CN103411972A (en) | Counting method of delta ferritic phase area content in Martensite heat resistant steel | |
| CN108918522B (en) | Evaluation method of wire rod structure for salt bath bridge cable | |
| CN109540634B (en) | Detection method for GH4648 plate sample grains and microstructures | |
| CN117825221A (en) | Detection technology of austenite grain size of high-carbon steel |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20190319 |
|
| RJ01 | Rejection of invention patent application after publication |