CN102776442A - Hot rolled steel used for stirrer in automotive stirring tank and production method thereof - Google Patents
Hot rolled steel used for stirrer in automotive stirring tank and production method thereof Download PDFInfo
- Publication number
- CN102776442A CN102776442A CN2012102630618A CN201210263061A CN102776442A CN 102776442 A CN102776442 A CN 102776442A CN 2012102630618 A CN2012102630618 A CN 2012102630618A CN 201210263061 A CN201210263061 A CN 201210263061A CN 102776442 A CN102776442 A CN 102776442A
- Authority
- CN
- China
- Prior art keywords
- automobile
- temperature
- hrs
- steel
- cooling
- 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
Images
Landscapes
- Heat Treatment Of Steel (AREA)
Abstract
The invention relates to a hot rolled steel used for a stirrer in an automotive stirring tank with tensile intensity of 750 MPa and a production method thereof. The hot rolled steel comprises the following chemical components by weight: 0.13-0.18% of C, not more than 0.15% of Si, 1.20-1.70% of Mn, 0.016-0.025% of P, not more than 0.008% of S, 0.035-0.070% of Als, 0.07-0.10% of Ti, 0.035-0.055% of Nb and 0.20-0.33% of Cu. The process comprises the following steps: smelting in a converter; treating in an LF furnace (ladle furnace); continuously casting to a blank and heating the cast blank; rolling in a segmental manner; cooling at variable speed and carrying out laminar flow cooling; coiling; and finishing and carrying out an after treatment process. According to the invention, an Rm average value is 780-800 MPa, elongation A is not less than 14%, the surface hardness HV10 reaches 260-300, in comparison with the conventional intensity steel with the same level, the surface hardness is at least improved for 20%, a plate form is easy to control, the surface quality is high, copper is particularly added, and the wear resistance and the anti-corrosion performance of a steel product are greatly improved.
Description
Technical field
The present invention relates to mechanical engineering with steel and working method thereof, specifically belong to a kind of tensile strength in 750MPa level automobile stirred pot whisking appliance with HRS and working method thereof.
Background technology
The whipping appts of automobile concrete drums is made up of tank body and whisking appliance, is one of primary member of truck mixer, also is the core component of performance truck mixer function.Along with light-weighted development trend of automobile and the energy-conservation needs of loss of weight, whisking appliance is also upgraded to 750MPa grade high-strength steel by the 520MPa rank with material tensile strength rank gradually.
The 750MPa level of present domestic use (or close grade) HRS in use exists wear resistance and the relatively poor defective of non-corrosibility.
Through preliminary search, number of patent application is 201010523909.7 document, and it discloses a kind of steel plate and working method that is used to make the concrete mixer tank body; It is characterized in that; It is a kind of ferritic, low-carbon bainite dual phase steel, and chemical ingredients is that C0.05-0.09%, Mn1.81-2.0%, S≤0.008%, P≤0.015%, Si≤0.07%, Nb0.02-0.04%, Ti0.07-0.14%, Als0.01-0.03%, surplus are Fe and unavoidable impurities, and tensile strength is 700-850Mpa; Unit elongation is 16-28%; 1150-1250 ℃ of slab tapping temperature, finishing temperature 860-890 ℃, coiling temperature 500-600 ℃.Come from actual result, this composition system product exists wear resistance, the relatively poor defective of non-corrosibility.
Summary of the invention
The purpose that the present invention wants is to solve the interior whisking appliance of present employed 750MPa level automobile stirred pot and has wear resistance and the relatively poor deficiency of non-corrosibility with HRS; Provide a kind of under the prerequisite that strength property satisfies; Whisking appliance is improved in the automobile stirred pot of life cycle of whisking appliance thus with HRS and working method thereof in surface hardness HV10:260 ~ 300.
Realize the measure of above-mentioned purpose:
Whisking appliance is used HRS, its chemical ingredients and weight percent content: C:0.13 ~ 0.18%, Si≤0.15% in a kind of automobile stirred pot; Mn:1.20 ~ 1.79%, P:0.016 ~ 0.025%, S≤0.008%; Als:0.035 ~ 0.070%, Ti:0.07 ~ 0.10%, Nb:0.035 ~ 0.055%; Cu:0.20 ~ 0.33%, surplus are Fe and unavoidable impurities.
Produce the method for the interior whisking appliance of a kind of automobile stirred pot, its step with HRS:
1) carries out converter smelting;
2) in the LF stove, handle, and add Si-Ca line second according to 600 ~ 650Kg/ Dun Gang ˙, adding speed is 250～300m/min;
3) continuous casting becomes base and strand is heated, and slab heating temperature is controlled at 1270 ~ 1310 ℃;
4) it is rolling to carry out segmentation: control roughing end temp is at 1070 ~ 1110 ℃, and control finish rolling finishing temperature is at 840 ~ 900 ℃;
5) adopt the speed change cooling to carry out the laminar flow cooling: at first to be 30 ~ 55 ℃/second and to cool off according to speed of cooling; When being cooled to temperature when being 650 ~ 700 ℃; Be 10 ~ 15 ℃/second according to speed of cooling again and cool off, be cooled to 560 ~ 620 ℃, and controlled chilling water water temperature is at 10 ~ 35 ℃;
6) batch, the control coiling temperature is at 560 ~ 620 ℃;
7) carry out finishing and back operation.
Preferably: slab heating temperature is controlled at 1280 ~ 1300 ℃.
Preferably: control roughing end temp is at 1080 ~ 1100 ℃.
Preferably: control finish rolling finishing temperature is at 860 ~ 880 ℃.
The reason of the effect of each component and main technique and control among the present invention:
Carbon: carbon is cheap solution strengthening element.According to the range of application of this steel grade, be mainly used in the tank body of the vehicle-mounted stirred pot of processing, adopt the multi-disc welding fabrication, the distortion of materials degree is less, can under the prerequisite that guarantees steel plate welding property, cold-bending property, design suitable carbon content.If its content less than 0.13%, then can not satisfy the requirement of the strength of materials and wear resistance; If its content is greater than 0.18%, and can not satisfy material welding performance after other elements couplings.So, its content is limited to 0.13～0.18% scope.
Silicon: silicon is cheap and effective steel liquid deoxidation element.In order to keep strength of parent, to carry out preliminary dexidation and add,, then can worsen the surface quality and the welding property of hot-rolled steel sheet, so setting its upper content limit is 0.15% if its content surpasses 0.15%.
Manganese: manganese is to improve the effective elements of intensity and toughness.If its content less than 1.20%, then can not satisfy the strength of materials and wear resistance requirement; But add the manganese of volume, can cause increasing the hardening capacity of steel, crack sensitivity is increased owing to weld the appearance of hardened layer, Given this, with being defined as 1.79% on it, so, its content is limited to 1.20～1.79% scopes.
Phosphorus: phosphorus has certain effect for the erosion resistance that improves steel, sets under it and is limited to 0.016%; But worsen for fear of welding property, drawing performance, toughness, suitability for secondary processing, setting its upper content limit is 0.025%.So its content is limited to 0.016 ~ 0.025%.
Sulphur: sulphur is very deleterious element.Sulphur in the steel often exists with the oxide morphology of manganese, and this sulfide inclusion is very disadvantageous to the impelling strength of steel, and causes the anisotropy of performance, therefore, needs to control sulphur content in the steel low more good more.Based on consideration, plan that sulphur content is controlled at below 0.008% in the steel to steel plate process for stamping and forming and manufacturing cost.
Aluminium: aluminium adds for deoxidation, when Als contains quantity not sufficient 0.035%, can not bring into play its effect; On the other hand, form the aluminum oxide agglomerate easily owing to add the aluminium of volume, so, be limited to 0.070% on the regulation Als.Therefore, Als content is limited to 0.035～0.070% scope.
Titanium: but titanium crystal grain thinning and the strength and toughness that improves steel are and favourable to welding property, and the AUSTENITE GRAIN COARSENING that the titanium nitride that generates in the steel produces during to welding heating prevents effect.When it contains quantity not sufficient 0.07%, can not bring into play its strengthening effect, do not reach requirement of strength; On the other hand, the titanium of adding surpasses at 0.10% o'clock, then can cause toughness to worsen owing to generating superfluous titanium carbide, according to the mechanical property target call, its titanium content is limited to 0.07～0.10% scope.
Niobium: niobium mainly improves the intensity of steel through crystal grain thinning and deposition precipitation strength; Be intensive carbon, nitrogen compound forming element, in steel, mainly exist, stop growing up of austenite crystal with Nb (C, N) form; Finally make ferrite grain size diminish thinning microstructure.When its content is lower than 0.035%, can not satisfy strength of materials requirement; And the niobium that adds is higher than at 0.055% o'clock, and cost of alloy can significantly rise and toughness worsens.So,, its content is limited to 0.035～0.055% scope according to the mechanical property target call.
Copper: copper forms tiny precipitated phase in steel, during deformation of steel the dislocation in the steel is played " pinning " effect, can improve intensity and toughness, and help the wear resisting property of steel.Copper plays the effect of reinforced ferrite, in ferritic, adds copper, can improve its solidity to corrosion in some reductant and the toughness of improving steel, when uniting use with P, can improve steel to atmospheric slushing oil especially.When its content less than 0.20% the time, can not satisfy the requirement of the strength of materials, wear resistance and Corrosion Protection; When its content greater than 0.33% the time, be easy to generate hot-shortly, cause material plasticity significantly to reduce.So, its content is limited to 0.20 ~ 0.33% scope.
Except the scope of above chemical ingredients having been done qualification, from improving the viewpoint of weldableness, economy, the present invention does not add valuable alloying elements such as Ni, Cr, Mo.
Rolling about carrying out segmentation, and control the roughing end temp at 1070 ~ 1110 ℃, control finish rolling finishing temperature also is a critical process of the present invention at 840 ~ 900 ℃, and preferred roughing end temp is at 1080 ~ 1100 ℃, and preferred finish rolling finishing temperature is at 860 ~ 880 ℃.The roughing end temp is lower than 1070 ℃ if this is, can't guarantee that then the finish rolling finishing temperature reaches set(ting)value, increases required power; As be higher than 1110 ℃, and then can in the two-phase region of material, be rolled, cause defectives such as mixed crystal.
The laminar flow cooling is carried out in process using speed change of the present invention cooling, promptly at first is 30 ~ 55 ℃/second according to speed of cooling and cools off, when being cooled to temperature when being 650 ~ 700 ℃; Being 10 ~ 15 ℃/second according to speed of cooling again cools off; Be cooled to 560 ~ 620 ℃, help the metallographic structure of uniform and delicate by the time like this, tissue such as carbide can even dispersion be distributed in the base steel; Guarantee that material obtains high mechanical property, and improved wear resisting property.
The present invention compared with prior art; Remove and to have lower yield strength ReL >=620Mpa, tensile strength Rm >=750 MPa, the Rm average is between 780 ~ 800MPa; Elongation A >=14%; Surface hardness HV10 reaches 260 ~ 300, improves 20% at least than existing same level strength steel, and the corrosion resistance nature of steel also improves; Yield tensile ratio is about 0.82, and plate shape is easy to control, and surface quality is high; It satisfies the making and the request for utilization of truck mixer stirred pot whisking appliance fully; Particularly, strengthened the thermodynamic stability of metal and alloy, significantly improved the wear resisting property and the Corrosion Protection of steel through adding copper; And composition is simple, and production cost is low.And this invention steel also can be used for the preparation of automobile stirred pot tank body.
Description of drawings
Accompanying drawing is metallographic structure figure of the present invention.
Embodiment
Describe in detail in the face of the present invention down:
Table 1 is the value tabulation of various embodiments of the present invention and Comparative Examples;
Table 2 is the main technologic parameters tabulation of various embodiments of the present invention and Comparative Examples;
Table 3 is various embodiments of the present invention and the tabulation of Comparative Examples performance monitoring situation.
Various embodiments of the present invention are according to following steps production:
Its step:
1) carries out converter smelting;
2) in the LF stove, handle, and add Si-Ca line second according to 600 ~ 650Kg/ Dun Gang ˙, adding speed is 250～300m/min;
3) continuous casting becomes base and strand is heated, and slab heating temperature is controlled at 1270 ~ 1310 ℃;
4) it is rolling to carry out segmentation: control roughing end temp is at 1070 ~ 1110 ℃, and control finish rolling finishing temperature is at 840 ~ 900 ℃;
5) adopt the speed change cooling to carry out the laminar flow cooling: at first to be 30 ~ 55 ℃/second and to cool off according to speed of cooling; When being cooled to temperature when being 650 ~ 700 ℃; Be 10 ~ 15 ℃/second according to speed of cooling again and cool off, be cooled to 560 ~ 620 ℃, and controlled chilling water water temperature is at 10 ~ 35 ℃;
6) batch, the control coiling temperature is at 560 ~ 620 ℃;
7) carry out finishing and back operation.
The value tabulation of table 1 various embodiments of the present invention and Comparative Examples
The main technologic parameters tabulation of table 2 various embodiments of the present invention and Comparative Examples
Table 3 various embodiments of the present invention and Comparative Examples mechanical properties test the results list
Can find out that from table 3 the present invention is because surface hardness is high,, improve 20% at least than the wear resisting property of compared steel so its wear resisting property is good.
Claims (5)
1. the interior whisking appliance of automobile stirred pot is used HRS, its chemical ingredients and weight percent content: C:0.13 ~ 0.18%, Si≤0.15%; Mn:1.20 ~ 1.79%, P:0.016 ~ 0.025%, S≤0.008%; Als:0.035 ~ 0.070%, Ti:0.07 ~ 0.10%, Nb:0.035 ~ 0.055%; Cu:0.20 ~ 0.33%, surplus are Fe and unavoidable impurities.
In the described a kind of automobile stirred pot of production claim 1 whisking appliance with the method for HRS, its step:
1) carries out converter smelting;
2) in the LF stove, handle, and add Si-Ca line second according to 600 ~ 650Kg/ Dun Gang ˙, adding speed is 250～300m/min;
3) continuous casting becomes base and strand is heated, and slab heating temperature is controlled at 1270 ~ 1310 ℃;
4) it is rolling to carry out segmentation: control roughing end temp is at 1070 ~ 1110 ℃, and control finish rolling finishing temperature is at 840 ~ 900 ℃;
5) adopt the speed change cooling to carry out the laminar flow cooling: at first to be 30 ~ 55 ℃/second and to cool off according to speed of cooling; When being cooled to temperature when being 650 ~ 700 ℃; Be 10 ~ 15 ℃/second according to speed of cooling again and cool off, be cooled to 560 ~ 620 ℃, and controlled chilling water water temperature is at 10 ~ 35 ℃;
6) batch, the control coiling temperature is at 560 ~ 620 ℃;
7) carry out finishing and back operation.
3. whisking appliance is with the method for HRS in a kind of automobile stirred pot of production as claimed in claim 2, and it is characterized in that: slab heating temperature is controlled at 1280 ~ 1300 ℃.
4. whisking appliance is characterized in that with the method for HRS in a kind of automobile stirred pot of production as claimed in claim 2: control roughing end temp is at 1080 ~ 1100 ℃.
5. whisking appliance is characterized in that with the method for HRS in a kind of automobile stirred pot of production as claimed in claim 2: control finish rolling finishing temperature is at 860 ~ 880 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210263061.8A CN102776442B (en) | 2012-07-27 | 2012-07-27 | Hot rolled steel used for stirrer in automotive stirring tank and production method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210263061.8A CN102776442B (en) | 2012-07-27 | 2012-07-27 | Hot rolled steel used for stirrer in automotive stirring tank and production method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102776442A true CN102776442A (en) | 2012-11-14 |
| CN102776442B CN102776442B (en) | 2014-04-09 |
Family
ID=47121544
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210263061.8A Active CN102776442B (en) | 2012-07-27 | 2012-07-27 | Hot rolled steel used for stirrer in automotive stirring tank and production method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102776442B (en) |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103451535A (en) * | 2013-09-18 | 2013-12-18 | 济钢集团有限公司 | Hot continuous rolling plate strip steel for 510MPa automotive frame and production technology thereof |
| CN103589964A (en) * | 2013-11-27 | 2014-02-19 | 内蒙古包钢钢联股份有限公司 | Steel plate used for 750MPa-grade hot rolling concrete agitator tank |
| CN104195438A (en) * | 2014-08-25 | 2014-12-10 | 武汉钢铁(集团)公司 | Steel with 520MPa-grade tensile strength for agitator tank and production method of steel |
| CN104195437A (en) * | 2014-08-25 | 2014-12-10 | 武汉钢铁(集团)公司 | Steel for stirring tank with tensile strength of 590MPa and production method of steel |
| CN104213022A (en) * | 2014-08-25 | 2014-12-17 | 武汉钢铁(集团)公司 | Agitation tank steel with tensile strength of 650 MPa grade and production method thereof |
| CN105088068A (en) * | 2015-08-31 | 2015-11-25 | 武汉钢铁(集团)公司 | Coated steel used for 500 MPa grade automobile girder and ultrafast-cooling production method of coated steel |
| CN105112778A (en) * | 2015-08-31 | 2015-12-02 | 武汉钢铁(集团)公司 | 460 MPa coating steel for automobile beam and ultra-fast cooling production method thereof |
| CN112077152A (en) * | 2020-08-28 | 2020-12-15 | 武汉钢铁有限公司 | Shape control method of high-strength steel for commercial vehicle longitudinal beam |
| CN112108527A (en) * | 2020-08-28 | 2020-12-22 | 武汉钢铁有限公司 | Method for controlling plate shape of steel for hot-rolled high-strength stirring tank body |
| CN112609035A (en) * | 2020-12-24 | 2021-04-06 | 常州东方特钢有限公司 | Production method of cold-resistant steel for automobile structural pipe |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101974722A (en) * | 2010-10-29 | 2011-02-16 | 河北钢铁股份有限公司唐山分公司 | Steel plate for manufacturing concrete mixer tank and production method |
| CN102247985A (en) * | 2011-07-01 | 2011-11-23 | 河北省首钢迁安钢铁有限责任公司 | Method for producing steel for stirring tank with limit specification through hot rolling |
-
2012
- 2012-07-27 CN CN201210263061.8A patent/CN102776442B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101974722A (en) * | 2010-10-29 | 2011-02-16 | 河北钢铁股份有限公司唐山分公司 | Steel plate for manufacturing concrete mixer tank and production method |
| CN102247985A (en) * | 2011-07-01 | 2011-11-23 | 河北省首钢迁安钢铁有限责任公司 | Method for producing steel for stirring tank with limit specification through hot rolling |
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103451535A (en) * | 2013-09-18 | 2013-12-18 | 济钢集团有限公司 | Hot continuous rolling plate strip steel for 510MPa automotive frame and production technology thereof |
| CN103451535B (en) * | 2013-09-18 | 2015-08-12 | 济钢集团有限公司 | A kind of 510MPa level automotive frame hot continuous rolling Strip and production technique thereof |
| CN103589964A (en) * | 2013-11-27 | 2014-02-19 | 内蒙古包钢钢联股份有限公司 | Steel plate used for 750MPa-grade hot rolling concrete agitator tank |
| CN104195438A (en) * | 2014-08-25 | 2014-12-10 | 武汉钢铁(集团)公司 | Steel with 520MPa-grade tensile strength for agitator tank and production method of steel |
| CN104195437A (en) * | 2014-08-25 | 2014-12-10 | 武汉钢铁(集团)公司 | Steel for stirring tank with tensile strength of 590MPa and production method of steel |
| CN104213022A (en) * | 2014-08-25 | 2014-12-17 | 武汉钢铁(集团)公司 | Agitation tank steel with tensile strength of 650 MPa grade and production method thereof |
| CN105088068A (en) * | 2015-08-31 | 2015-11-25 | 武汉钢铁(集团)公司 | Coated steel used for 500 MPa grade automobile girder and ultrafast-cooling production method of coated steel |
| CN105112778A (en) * | 2015-08-31 | 2015-12-02 | 武汉钢铁(集团)公司 | 460 MPa coating steel for automobile beam and ultra-fast cooling production method thereof |
| CN112077152A (en) * | 2020-08-28 | 2020-12-15 | 武汉钢铁有限公司 | Shape control method of high-strength steel for commercial vehicle longitudinal beam |
| CN112108527A (en) * | 2020-08-28 | 2020-12-22 | 武汉钢铁有限公司 | Method for controlling plate shape of steel for hot-rolled high-strength stirring tank body |
| CN112077152B (en) * | 2020-08-28 | 2022-08-09 | 武汉钢铁有限公司 | Shape control method of high-strength steel for commercial vehicle longitudinal beam |
| CN112108527B (en) * | 2020-08-28 | 2022-08-09 | 武汉钢铁有限公司 | Method for controlling plate shape of steel for hot-rolled high-strength stirring tank body |
| CN112609035A (en) * | 2020-12-24 | 2021-04-06 | 常州东方特钢有限公司 | Production method of cold-resistant steel for automobile structural pipe |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102776442B (en) | 2014-04-09 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102776442B (en) | Hot rolled steel used for stirrer in automotive stirring tank and production method thereof | |
| CN109943778B (en) | 590 MPa-grade cold-rolled dual-phase steel with excellent hole expansion performance and production method thereof | |
| CN103534365B (en) | Hot-rolled steel sheet and associated production method | |
| CN103361547B (en) | A kind of production method of cold formability ultrahigh-strength steel plates and steel plate | |
| JP7457843B2 (en) | Steel plate for polar marine construction and its manufacturing method | |
| CN103194687B (en) | Low-alloy high-strength cast steel for low temperature and preparation method thereof | |
| CN106987771B (en) | A kind of extremely low yield strength steel plate and its production method | |
| CN102212745A (en) | High-plasticity 780MPa-level cold rolled dual-phase steel and preparation method thereof | |
| CN105803334B (en) | Tensile strength 700MPa level hot rolling Multiphase Steels and its production method | |
| CN104357744A (en) | Tensile strength more than or equal to 780MPa grade hot-rolled dual phase steel and production method thereof | |
| CN107964624A (en) | A kind of yield strength 500MPa level structure steel and preparation method thereof | |
| CN105925905B (en) | 780MPa grades of hot-rolled dual-phase steels of Nb-Ti systems and its production method | |
| CN105950984B (en) | Tensile strength 650MPa level hot rolling Multiphase Steels and its production method | |
| CN100445411C (en) | Casting steel containing rare earth element and protuction process thereof | |
| CN104120368A (en) | High-strength austenitic stainless steel for automobile frames and manufacturing method thereof | |
| WO2013044641A1 (en) | High-strength and high-toughness steel plate with yield strength being 700 mpa and manufacturing method thereof | |
| CN104032215A (en) | 420MPa grade steel for automobile wheel and production method thereof | |
| CN109112398A (en) | A kind of chrome-bearing alloy bar and preparation method thereof | |
| CN113403550A (en) | High-plasticity fatigue-resistant cold-rolled hot-galvanized DH1180 steel plate and preparation method thereof | |
| CN102409233A (en) | Low-temperature steel for engineering machinery and production method thereof | |
| CN111763883A (en) | Steel for hollow stabilizer bar and production method thereof | |
| CN102400063A (en) | Ultra-high strength hull and offshore platform steel with yield strength of 550 Mpa and production method thereof | |
| CN104213022A (en) | Agitation tank steel with tensile strength of 650 MPa grade and production method thereof | |
| WO2019029533A1 (en) | Cast steel, preparation method for cast steel and use of cast steel | |
| CN111004978B (en) | Low-alloy high-temperature-resistant pressure vessel steel plate and production method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20170711 Address after: 430083 Qingshan District, Hubei, Wuhan factory before the door No. 2 Patentee after: Wuhan iron and Steel Company Limited Address before: 430080 Wuhan, Hubei Friendship Road, No. 999, Wuchang Patentee before: Wuhan Iron & Steel (Group) Corp. |
|
| TR01 | Transfer of patent right |