CN107557531A - A kind of non-hardened and tempered steel sulphide inculsion control method of barium alloy processing - Google Patents
A kind of non-hardened and tempered steel sulphide inculsion control method of barium alloy processing Download PDFInfo
- Publication number
- CN107557531A CN107557531A CN201710640647.4A CN201710640647A CN107557531A CN 107557531 A CN107557531 A CN 107557531A CN 201710640647 A CN201710640647 A CN 201710640647A CN 107557531 A CN107557531 A CN 107557531A
- Authority
- CN
- China
- Prior art keywords
- steel
- sulfide
- hardened
- barium alloy
- core
- 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.)
- Granted
Links
Landscapes
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The application provides a kind of non-hardened and tempered steel sulphide inculsion control method of barium alloy processing, using barium alloy to Al2O3It is mingled with and is denatured, while Cleanliness of Molten Steel is improved, makes remaining Al2O3It is distributed with disperse uniform state, and the core formed as follow-up Sulfide inclusion, pass through the control of the control of Al, Ba, S content, addition time and method, realize non-hardened and tempered steel sulfur content in the case of 0.04 0.06%, continuous casting realizes that 8 stoves even pour, sulphide inculsion is slightly≤2.0 grades, thin≤3.0 grades of system.
Description
Technical field
The present invention relates to the composition for the sulphide inculsion for improving cutting ability in non-hardened and tempered steel production process, form and divide
The control of cloth, belong to the refining Control and Inclusion Removal technology of field of steel metallurgy.
Background technology
Middle carbon microalloy pearlitic steel is a kind of economical new material preferably saved the energy, economized on resources, and meets steel production
The requirement of industry development policies, has wide economical, societal benefits and market prospects.Its purposes is quite varied, mainly for the manufacture of
The workpiece such as all kinds of automobiles, engineering machinery bent axle, connecting rod, power transmission shaft, knuckle.Automobile using non-hardened and tempered steel can reduce energy consumption and into
This, strain cracking caused by quenching during reduction is quenched, and lightweight can be realized.In recent years, with China's auto output and
The increase of car ownership, the pressure of energy-saving and emission-reduction increase rapidly.But China's automobile using non-hardened and tempered steel applies not yet common, non-tune
Matter steel only accounts for the 7% of Special Steel for Automobile, and Japan then accounts for 33%.The present situation of energy scarcity and international trend is complied with China
In the case of, extension non-hardened and tempered steel is in China's industry using significant.
Several countries such as Germany, Sweden and Japan take the lead in non-hardened and tempered steel research and application aspect achieve preferably into
Fruit.The 1980s, China initially entered the ranks of research and development non-hardened and tempered steel, but in the stability of standard level and steel product quality
Etc., with the state-owned obvious gap such as day, moral, it have impact on the promotion and application of non-hardened and tempered steel.
Added to improve the machinability of automobile using non-hardened and tempered steel, in steel appropriate sulphur (generally 0.035%~
0.08%) chip breaking when, can promote the product cutting to process, extend the service life of cutting tool, improve product surface finish,
Improve steel machinability.But sulfide easily generates the manganese sulfide of elongated strip after rolling deformation in steel, causes steel
The anisotropy of material mechanical property, therefore the precipitation of sulfide in steel is rationally controlled, make it have suitable form, size, number
Amount and distribution, the combination property important in inhibiting to improving the high-quality steel such as non-hardened and tempered steel, the morphology Control of sulfide
It is one of difficulties that metallurgy industry endeavours solution.Calcium treatment Tempered Steel Containing Sulphur is current most study and is also industry
The most frequently used method in production.But the control device of oxide morphology and size is limited in current Tempered Steel Containing Sulphur, related
Study mechanism also lacks depth.Therefore, the research and development of automobile using sulfur-bearing middle carbon microalloy pearlitic steel process of setting sulfide control technology
With wide market prospects and huge social benefit.
The main research work that the form of sulfide and size are carried out in control steel at present, first, being vulcanized by adding
Thing formation element controls the form of sulfide, makes the sulfide thin second, be used as the oxide of sulfide precipitation core by control
It is small, be dispersed to precipitate.Different researchers has carried out a series of researchs to this problem from different angles, have studied the shape of sulfide
Influence into mechanism and different process factor to oxide morphology in steel.
Molten steel add Calcium treatment make sulphide inculsion denaturation come improve the method for steel product quality in STEELMAKING PRODUCTION it is extensive
Use.Document 7 has carried out the industrial comparative experimental research that Calcium treatment is modified oxide morphology, to the form of sulfide in bar,
Component type has carried out quantitative statistical analysis.As a result show：Calcium treatment can make to form more complex sulfides in steel, improve
Calcium content in sulfide, so as to significantly reducing the length-width ratio of sulfide.Meanwhile find that raising Mn/S is favourable by studying
In the distributing homogeneity for improving sulfide in as cast condition and bar；Be advantageous to nodularization or the spindle of sulfide with Mn/S raising
Control, Mn/S should be controlled 40 or so under experiment condition.
《The influence of magnesium and magnesium Calcium treatment to oxide morphology in non-hardened and tempered steel》It has studied magnesium processing and magnesium calcium Combined Processing
To the form of sulfide, size and the influence of distribution in non-hardened and tempered steel, show that Metamorphism treatment makes as cast condition sulfide from II classes to III
Class and the transformation of I classes, improve the distribution of sulfide, but size has increased.
University of Science ＆ Technology, Beijing's journal publication《The action rule and Optimal Control of rare earth in steel》Study RE Modified sulphur
Compound shows, in order to obtain the Rare Earth Treated Steel of high quality, it is necessary to controls the scope of suitable RE/s ratios in steel.Inner Mongol section
The publication of skill college journal《Influence of the rare earth alms bowl magnesium composite modifier to 55400 steel inclusions》Utilize RE-Mg composite inoculatings
Handle sulfur bearing steel and find that inclusion size substantially diminishes, be evenly distributed, the yielding MnS field trashes of strip by size it is small, be in
Spherical and Dispersed precipitate rare earth, magnesium complex inclusion are substituted.It is slightly that sulphide grade is obviously reduced in steel, is carefully sulfide
Rank has increased, and larger inclusion modification is tiny field trash in steel, and steel inclusion size is greatly improved.
Simple dragon, Chen Weiqing, what Meng Jinxia was delivered《The control of oxide morphology in Tempered Steel Containing Sulphur》Laboratory to containing
Sulphur non-hardened and tempered steel has carried out smelting and forging and pressing experiment, the results showed that:With the increase of steel freezing rate, the chi of sulphide inculsion in steel
It is very little reduction and increasing number；With forging and stamping compression ratio increase, sulphide inculsion fragmentation and become tiny；The sulphur when forging and pressing for 950 DEG C
The plasticity of compound is best, and at 1250 DEG C, the plasticity of sulfide is preferable, and the plasticity of sulfide is poor between 1050~1150 DEG C；
With the extension of soaking time during heating, the quantity of sulphide inculsion is reduced and size increases.
Henan Metallurgical publication《Using the research of Oxides Metallurgy Technology exploitation non-hardened and tempered steel》By Oxides Metallurgy Technology
Research applied to non-hardened and tempered steel, it was confirmed that make the size and number of the scattered adjustable MnS of oxide in steel.
The publication of material heat treatment journal《Influence of the Isothermal treatment to sulfide in YF45MnV steel》It is proposed pair
So as to control the concept of sulfide in steel, research shows YF45MnV steel continuous casting billets Isothermal treatment, suitable heat treatment parameter energy
Enough by sulfide control in YF45MnV steel continuous casting billets is reduced size and ideal form (fusiform and subsphaeroidal)；Isothermal processes
Thick austenite afterwards, crystal grain refinement can be realized by deformation after unloading process.
The publication of material heat treatment journal《MnS Precipitation Behaviors in easy-cutting untempered steel process of setting and steel》With Cutting free
Non-hardened and tempered steel typical case's steel grade YF45MnV is research object, with Thermodynamic Calculation Software, calculates the pick-up behavior of Study on Steel, sharp
With Scheil-Gulliver models, calculating simulation is studied and solidified to the significant process of setting of oxide morphology distribution influence
The segregation behavior of alloying element in journey.
《The theory analysis of the Controlled Element of Ostwald maturing process of the manganese sulfide in steel》According to second in dilute solution
The theory of the Ostwald curings of phase, analysis calculate the relative amount of sulphur in steel, manganese element to manganese sulfide in steel
The influence of Ostwald maturing process Controlled Elements.When the manganese in the steel alloy containing manganese, Hi-Stren steel and straight carbon steel contains
When amount is more than 0.17%, the Controlled Element of the Ostwald maturing process of manganese sulfide is sulphur.
《The solute microsegregation model of steel casting process》Consider what δ/γ phase in version and MnS in steel process of setting were separated out
Thermodynamic condition, the solute microsegregation model that coupling MnS is mingled with precipitation is established, analyze steel grades, the analysis of MnS field trashes
Go out and cooldown rate is to the affecting laws of steel process of setting mechanical behavior under high temperature.
The control of 2007 China Steel nd Annual Meeting collection publication and the microscopic segregation in utilization steel process of setting and macroscopic view are inclined
Analysis develop one be used for analyze non-metallic inclusion composition transfer including sulfide mathematical modeling, and indicate
The critical spot segregation size for preventing Mns to separate out in continuous casting steel billet.
Steel is found during the mechanical behavior under high temperature of Study on Steel after 1330 DEG C of solution treatment, almost all of sulphur now all weighs
New dissolving, as the progress of solidification is separated out in the form of sulfide in crystal boundary, the S plasticity influence separated out again for steel is very
Greatly.CaS, which can equably be solid-solution in formation (Ca, Mn) S field trashes, CaS this solution strengthening effect in MnS, can increase sulfide
Hardness, and as the increase of content in sulfide, the hardness of sulfide accordingly increase.
And the experimental results show, the size of manganese sulfide will influence its deformation row in follow-up rolling in continuous casting billet
For.After manganese sulfide is less than 5 μm, with the reduction of size, its is moulding by reduction；After it is less than 1 μm, manganese sulfide is very in rolling
To not deforming.If the sulfide control in steel can be arrived into reduced size before the rolling, it is in the follow-up operation of rolling
Deformation will greatly reduce.
In summary, sulphide inculsion denaturation and process of setting be control sulfide composition, one of form and distribution most
Important process.But it is domestic at present less to Tempered Steel Containing Sulphur process of setting sulfide formation mechanism study, controlled level compared with
Low, sulphur mainly exists with the class ii MnS of clustering distribution in steel, causes steel combination property poor, it is impossible to meet domestic correspondent
Demand, also need a large amount of imports.
The present invention is the base that sulfide forms with control technology in the domestic and international automobile using Tempered Steel Containing Sulphur of analysis and summary
On plinth, develop by barium alloy handle based on sulfide control technology.
The content of the invention
The technical problem to be solved in the present invention is：Controlled level is low, steel combination property is poor in existing basis, amount containing S is high,
Impurity content is high, the technical problems such as nozzle clogging easily occurs in casting process.
Technical scheme：
A kind of non-hardened and tempered steel sulphide inculsion control method of barium alloy processing, step are：
The first step：Steel grade is smelted, adds end-deoxidizer grain refining element in converter tapping process in molten steel,
The end-deoxidizer grain refining element is aluminium, and aluminium addition is the 0.01-0.05% of quality of molten steel；
Second step：Barium alloy is added in molten steel at the end of LF refining, to the Al of first step generation2O3Carry out field trash
Denaturation, the barium alloy addition are the 0.0001-0.03% of quality of molten steel；
3rd step：After VD vacuum outgas, composite sulfuration of the sulfide formation using oxide as core is added in molten steel
Thing, the sulfide addition are the 0.01-0.08% of quality of molten steel.
As a preferred technical solution of the present invention：The sulfide is using sulphur, iron sulfide, the cored for feeding sulphur
Line or the core-spun yarn for feeding iron sulfide.
As a preferred technical solution of the present invention：The barium alloy be SiBa core-spun yarns, SiCaBa core-spun yarns,
SiAlBa core-spun yarns or SiCaAlBa core-spun yarns.
As a preferred technical solution of the present invention：The control range of Al content in the steel processing procedure is：
The control range of 0.01-0.05%, Ba content is：The control range of 0.0001-0.030%, S content is：0.01-0.08%.
As a preferred technical solution of the present invention：The addition time of the sulfide is addition barium alloy >=10min
Afterwards.
Beneficial effect：
1st, oxide inclusion denaturation treatment is carried out to the steel for not yet adding sulphur by adding barium alloy, is improving the non-tune of sulfur-bearing
While matter steel cleanness, remaining Al is refined and homogenized2O3It is mingled with, and in this, as the formation core for forming sulphide inculsion.
2nd, the technical measures and control Ba contents that S is added by first adding after Ba exist in 0.0001-0.030%, sulfur content
0.010-0.080% contains scope, realizes the stabilization of sulfur content and the denaturation of sulfide.And prevent the nozzle clogging of casting process.
3rd, 0.015% Al content is added in converter tapping to C70S6BY steel grades, by theory at the end of ladle refining
Amount of calculation adds 0.01% Ba contents, and 0.065% S contents are added after application of vacuum.Final acquisition sulphide inculsion is small
Effect more than 2 grades, the stove of direct casting 8.
4th, to F45MnVS, aluminium deoxidation is being used by electric furnace steel tapping process, is being that adjustment aluminium content arrives in first sample of LF
0.040-0.060%, the Si-Ca-Ba core-spun yarn of 2 meter/ton steel is fed at the end of LF refining.After VD vacuum outgas after vacuum breaker
Sulfur content is added to 0.030-0.050%.The final sulphide inculsion that obtains is less than 2 grades, the effect more than stove of direct casting 10.
Embodiment：
Embodiment of the present invention is explained in further detail below by specific implementation.
Embodiment 1：
1) steel grade：C70S6BY
2) technological process：It is 100 tons of converter smeltings → LF refining+VD vacuum outgas → 220 × 280 bases of continuous casting → insulation, clear
Reason → heating stove heat → production φ 70mm materials → insulation → align → strip off the skin → pickling, cleaning → ultrasonic examination → inspection by sampling
Analysis.Aluminium wherein is added in converter tapping process, barium alloy is fed at the end of LF refining, is improving the same of Cleanliness of Molten Steel
When, to remaining Al2O3It is mingled with denaturation and is mingled with core for the oxide of Dispersed precipitate, is formed as further using oxide as core
Sulfide basis, add sulfide after VD vacuum outgas.
3) key point in course
(1) converter tapping alloy deoxidizer
Converter tapping process adds aluminium and carries out pre-deoxidation operation, and specific addition sequence is：Ferrosilicon, silicomanganese, Gao Ge → aluminium →
Ferro-silico aluminium → high nitrogen carburant → lime, specific addition are as shown in the table：
(2) refinement and deoxidation adjusting component, the molten steel composition before barium alloy is added：
Feed the SiBa core-spun yarns of 0.021% mass parts, the i.e. meter/ton steel of SiBa core-spun yarns 1.5.
(3) composition of refining process refining slag
| Sample time | SiO2 | FeO | Al2O3 | CaO | MgO | Basicity |
| After VD | 14.45 | 1.1 | 26.9 | 44.96 | 6.31 | 3.55 |
| Before bull ladle | 15.1 | 0.87 | 30.67 | 39.56 | 6.86 | 3.07 |
(4) steel melting chemical composition adjustment sulfur content, adjusts the molten steel composition after sulfur content
The core-spun yarn that feeding sulphur is added after VD vacuum outgas adjusts sulfur content to meeting steel grade technical protocol requirement.
(5) non-metallic inclusion of steel
(6) gas content in steel
Embodiment 2：
1) steel grade：F45MnV
2) technological process：70 tons of EAF converter smeltings → LF refining+VD vacuum outgas → 180 × 240 bases of continuous casting → slow cooling/
Hot sending → heating stove heat → production material → slow cooling → aligning → finishing → ultrasonic examination → inspection storage.Wherein in converter tapping
Process adds aluminium, barium alloy is fed at the end of LF refining, while Cleanliness of Molten Steel is improved, to remaining Al2O3It is mingled with denaturation
It is mingled with core for the oxide of Dispersed precipitate, as the further basis formed using oxide as the sulfide of core, is adding
Sulfide is added after barium alloy >=10min.
3) key point in course
(1) pre-deoxidation is carried out by adding aluminium in electric furnace steel tapping process, adjusts alloy in refining process and aluminium content is as follows
Shown in table.
(2) then feeding 2.0 meters/ton Si-Ca-Ba core-spun yarn.Then carry out VD applications of vacuum.Refining process refining slag
Composition
| CaO | SiO2 | FeO | Al2O3 | MgO | Basicity |
| 48.90 | 17.81 | 0.93 | 12.9 | 6.31 | 2.75 |
(3) steel melting chemical composition, the molten steel composition after sulfur content is adjusted
After application of vacuum, according to actual sulfur content in steel, the core-spun yarn for adding feeding iron sulfide adjusts sulfur content to steel grade
Technical protocol claimed range.
(4) non-metallic inclusion of steel
Claims (5)
1. the non-hardened and tempered steel sulphide inculsion control method of a kind of barium alloy processing, it is characterised in that step is：
The first step：Steel grade is smelted, adds end-deoxidizer grain refining element in converter tapping process in molten steel, it is described
End-deoxidizer grain refining element is aluminium, and aluminium addition is the 0.01-0.05% of quality of molten steel；
Second step：Barium alloy is added in molten steel at the end of LF refining, to the Al of first step generation2O3Carry out inclusion modification,
The barium alloy addition is the 0.0001-0.03% of quality of molten steel；
3rd step：After VD vacuum outgas, complex sulfide of the sulfide formation using oxide as core, institute are added in molten steel
State the 0.01-0.08% that sulfide addition is quality of molten steel.
2. the non-hardened and tempered steel sulphide inculsion control method handled according to barium alloy described in right 1, it is characterised in that：The vulcanization
Thing is using sulphur, iron sulfide, the core-spun yarn for feeding sulphur or the core-spun yarn for feeding iron sulfide.
3. the non-hardened and tempered steel sulphide inculsion control method of the barium alloy processing is required according to right 1, it is characterised in that：It is described
Barium alloy is SiBa core-spun yarns, SiCaBa core-spun yarns, SiAlBa core-spun yarns or SiCaAlBa core-spun yarns.
4. the non-hardened and tempered steel sulphide inculsion control method of described barium alloy processing is required according to right 1, it is characterised in that：Institute
The control range for stating the Al content in steel processing procedure is：The control range of 0.01-0.05%, Ba content is：0.0001-
The control range of 0.030%, S content is：0.01-0.08%.
5. the non-hardened and tempered steel sulphide inculsion control method of described barium alloy processing is required according to right 1, it is characterised in that：Institute
After the addition time for stating sulfide is addition barium alloy >=10min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710640647.4A CN107557531B (en) | 2017-07-31 | 2017-07-31 | Barium alloy treated non-quenched and tempered steel sulfide inclusion control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710640647.4A CN107557531B (en) | 2017-07-31 | 2017-07-31 | Barium alloy treated non-quenched and tempered steel sulfide inclusion control method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107557531A true CN107557531A (en) | 2018-01-09 |
| CN107557531B CN107557531B (en) | 2020-11-20 |
Family
ID=60973870
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710640647.4A Active CN107557531B (en) | 2017-07-31 | 2017-07-31 | Barium alloy treated non-quenched and tempered steel sulfide inclusion control method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107557531B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113088788A (en) * | 2021-03-03 | 2021-07-09 | 武汉科技大学 | Method for reducing harmfulness of aluminum nitride inclusions in high-aluminum steel |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1011719A1 (en) * | 1980-12-04 | 1983-04-15 | Центральный Ордена Трудового Красного Знамени Научно-Исследовательский Институт Черной Металлургии Им.И.П.Бардина | Steel |
| CN1208772A (en) * | 1998-06-19 | 1999-02-24 | 西宁特殊钢集团有限责任公司 | Art for refining bearing steel processed by barium series alloy treatment |
| CN1480549A (en) * | 2003-08-08 | 2004-03-10 | 钢铁研究总院 | Clean steel containing barium and its manufacturing method |
| CN1590574A (en) * | 2003-08-25 | 2005-03-09 | 钢铁研究总院 | Barium micro alloying bearing steel |
| CN1667129A (en) * | 2004-03-10 | 2005-09-14 | 首钢总公司 | Method for producing sulfur free cutting and non-hardened and tempered steel |
| CN105671434A (en) * | 2016-03-19 | 2016-06-15 | 上海大学 | Magnesium, calcium and sulfur containing 20MnCr free-cutting gear steel and preparation method thereof |
-
2017
- 2017-07-31 CN CN201710640647.4A patent/CN107557531B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1011719A1 (en) * | 1980-12-04 | 1983-04-15 | Центральный Ордена Трудового Красного Знамени Научно-Исследовательский Институт Черной Металлургии Им.И.П.Бардина | Steel |
| CN1208772A (en) * | 1998-06-19 | 1999-02-24 | 西宁特殊钢集团有限责任公司 | Art for refining bearing steel processed by barium series alloy treatment |
| CN1480549A (en) * | 2003-08-08 | 2004-03-10 | 钢铁研究总院 | Clean steel containing barium and its manufacturing method |
| CN1590574A (en) * | 2003-08-25 | 2005-03-09 | 钢铁研究总院 | Barium micro alloying bearing steel |
| CN1667129A (en) * | 2004-03-10 | 2005-09-14 | 首钢总公司 | Method for producing sulfur free cutting and non-hardened and tempered steel |
| CN105671434A (en) * | 2016-03-19 | 2016-06-15 | 上海大学 | Magnesium, calcium and sulfur containing 20MnCr free-cutting gear steel and preparation method thereof |
Non-Patent Citations (6)
| Title |
|---|
| 卓晓军等: "汽车用高品质非调质钢生产过程中的非金属夹杂物研究", 《钢铁》 * |
| 干勇 主编: "《现代连续铸钢实用手册》", 31 January 2010, 冶金工业出版社 * |
| 王忠英等: "用钡合金对齿轮钢脱氧的工艺研究 ", 《钢铁研究学报》 * |
| 王忠英等: "用钡合金对齿轮钢脱氧的工艺研究", 《钢铁研究学报》 * |
| 铁生年等: "轴承钢生产中的钡合金脱氧工艺 ", 《机械工程材料》 * |
| 铁生年等: "轴承钢生产中的钡合金脱氧工艺", 《机械工程材料》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113088788A (en) * | 2021-03-03 | 2021-07-09 | 武汉科技大学 | Method for reducing harmfulness of aluminum nitride inclusions in high-aluminum steel |
| CN113088788B (en) * | 2021-03-03 | 2022-03-15 | 武汉科技大学 | Method for reducing harmfulness of aluminum nitride inclusions in high-aluminum steel |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107557531B (en) | 2020-11-20 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109252097B (en) | Non-quenched and tempered steel of high-strength expansion-fracture connecting rod and continuous casting production process thereof | |
| CN103160729B (en) | Medium-carbon microalloyed steel for engineering machinery caterpillar chain piece and production process thereof | |
| CN105543678B (en) | High intensity non-annealed steel for fastener wire rod of a kind of boracic and preparation method thereof | |
| CN107904492A (en) | A kind of low silicon high-carbon-chromium bearing steel and its hot rolling production method | |
| CN111961988B (en) | Production process and forging method of medium-carbon non-quenched and tempered steel for automobile expansion fracture connecting rod | |
| CN104762562B (en) | Steel for large-diameter grinding balls and preparation method of steel | |
| CN106048415B (en) | A kind of Ni microalloyings stone oil drill collar steel and preparation method thereof | |
| CN106929622A (en) | A kind of preparation method of high-quality 40Cr structural alloy steel hot rolling wire rods | |
| CN108929997B (en) | Bearing steel for automobile hub and manufacturing method thereof | |
| CN110894584B (en) | Non-quenched and tempered steel and manufacturing method thereof | |
| CN108611562A (en) | A kind of sulfur-bearing al-killed non-hardened and tempered steel and its Morphology of Sulfide control method | |
| CN102560252B (en) | Steel for medium-carbon Cr alloying connecting rod and manufacturing method of steel | |
| CN113215472B (en) | Niobium-vanadium microalloyed high-strength fine-grain non-quenched and tempered cold forging steel square billet and manufacturing method thereof | |
| CN113025914B (en) | High-performance online quenching high-strength steel pipe and production method thereof | |
| CN108359898A (en) | A kind of low preparation method for being mingled with bearing steel of hypoxemia | |
| CN110205542A (en) | A kind of cold roll tool steel and preparation method thereof | |
| CN108342645B (en) | Steel for hypereutectoid grinding ball and preparation method thereof | |
| CN105331874B (en) | A kind of spheroidal graphite cast-iron cast gear | |
| CN103882301B (en) | J55 level Low-cost electric welding resistance oil casing pipe steel and manufacture method thereof | |
| CN104357761A (en) | Sulfur-containing free-cutting die steel smelting technique | |
| CN113604745A (en) | High-sulfur free-cutting tool steel bar and preparation method thereof | |
| CN107675092A (en) | A kind of high-cleanness, high shock resistance track shoe steel and preparation method thereof | |
| CN102367543A (en) | Boron steel ASTMA36-B medium and heavy plate and production process thereof | |
| CN107557531A (en) | A kind of non-hardened and tempered steel sulphide inculsion control method of barium alloy processing | |
| CN116657043A (en) | Steel for low-alkalinity bead wire and production process thereof |
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 | ||
| TA01 | Transfer of patent application right | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20201027 Address after: 241200 Chungu 3D Printing Industrial Park, Fanchang Economic Development Zone, Fanchang County, Wuhu City, Anhui Province Applicant after: Anhui steel research new material technology Co., Ltd Address before: 223007 A4 building of wisdom valley of Huaian economic and Technological Development Zone in Jiangsu Province Applicant before: EAST CHINA BRANCH OF CISRI |
|
| GR01 | Patent grant | ||
| GR01 | Patent grant |