CN103320708B - Offshore platform rack steel with thickness of more than or equal to 114 mm, and production method thereof - Google Patents
Offshore platform rack steel with thickness of more than or equal to 114 mm, and production method thereof Download PDFInfo
- Publication number
- CN103320708B CN103320708B CN201310166416.6A CN201310166416A CN103320708B CN 103320708 B CN103320708 B CN 103320708B CN 201310166416 A CN201310166416 A CN 201310166416A CN 103320708 B CN103320708 B CN 103320708B
- Authority
- CN
- China
- Prior art keywords
- steel
- less
- control
- temperature
- equal
- 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.)
- Active
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Landscapes
- Heat Treatment Of Steel (AREA)
Abstract
The invention relates to an offshore platform rack steel with a thickness of more than or equal to 114 mm. The offshore platform rack steel comprises, by weight, 0.14-0.192% of C, 0.15-0.35% of Si, 0.98-1.3% of Mn, less than or equal to 0.014% of P, less than or equal to 0.008% of S, 0.15-0.35% of Cr, 1.2-1.5% of Ni, 0.40-0.58% of Mo, 0.15-0.26% of Cu, 0.032-0.068% of V, less than or equal to 0.0003% of [O], less than or equal to 0.007% of [N], less than or equal to 0.003% of Sn, less than or equal to 0.003% of As, and less than or equal to 0.002% of Sb. The process steps comprise: smelting through an electric furnace, a LF refining furnace treatment, vacuum smelting in a VD furnace, vacuum pumping and pressure maintaining in the VD furnace, soft blowing in the VD furnace, continuous casting, electroslag re-melting smelting, electroslag billet heating, sectional rolling, air cooling, and a heat treatment to be spare, wherein the heat treatment adopts a quenching and tempering treatment manner. According to the present invention, the electric furnace and electroslag re-melting combination manner is adopted to produce the steel, wherein a yield strength of the steel is at least 650 MPa, a thickness of the steel is 114-152 mm, and a cost of the steel prepared by the method of the present invention is lower 500-700 yuan/ton compared to a cost of a forging manner so as to easily enhance product competitiveness.
Description
Technical field
The present invention relates to offshore platform steel and production method thereof, belong to thickness >=114mm particularly, yield strength is greater than 650MPa level ocean platform rack steel and production method thereof.
Background technology
Ocean platform is a kind of ocean engineering structure, it provides the place of offshore operation and life for development and utilization oceanic resources, along with developing rapidly of ocean exploitation cause, ocean platform is widely used, as the exploration and development of submarine oil and Sweet natural gas, subsea pipeline are laid, the utilization of ocean wave energy, built seadrome and marine factory etc.Current application ocean platform the most widely field surely belongs to the exploration and development of offshore oil and gas resource.
Marine drilling platform is the operational base implementing sea-bottom oil-gas exploration and exploitation, it indicates the level of sea-bottom oil-gas development technique, and the principle of work of offshore drilling platform hoisting system is Rack and pinion mechanism, in the working process of marine drilling platform, Rack and pinion mechanism is responsible for the lifting work of whole platform.
Tooth bar is the key member of self-rising type offshore oil platform, the load produced when it bears platform body ascending, descending.The performance of rack steel excellence is the prerequisite ensureing that platform safety uses.Therefore, when building ocean platform, rack steel is always in occupation of very consequence.
The ocean platform rack steel thickness of 650MPa level, mostly at more than 100mm, must use large substance extra-thick plate blank to produce, and requires more and more stricter to plate quality.From the mode that current special heavy plate is produced, except adopting original forging method, also has popular continuous metal cast process.But due to the restriction of continuous-casting converter billet internal segregation and compression ratio, the special heavy plate that thickness is less than 100mm can only be produced, bring thus and use electric slag refusion and smelting explained hereafter continuous casting steel billet.
Summary of the invention
The invention reside in solve adopts converter cannot produce thickness and be greater than 114 millimeters, though adopt forging mode to produce, cost is high, and inefficient deficiency, provide a kind of by adopting electric furnace
withthe mode that esr combines, produce not only yield strength and be at least 650MPa, thickness is greater than 114 millimeters, and the ocean platform rack steel of cost 500 ~ 700 yuan/ton steel lower than forging mode and production method thereof.
Realize the measure of above-mentioned purpose:
The ocean platform rack steel of a kind of thickness >=114mm, its component and weight percent content are: C:0.14 ~ 0.192, Si:0.15 ~ 0.35, Mn:0.98 ~ 1.3, P :≤0.014, S :≤0.008, Cr:0.15 ~ 0.35, Ni:1.2 ~ 1.5, Mo:0.40 ~ 0.58, Cu:0.15 ~ 0.26, V:0.032 ~ 0.068, [O]≤0.0003, [N]≤0.007, Sn :≤0.003, As :≤0.003, Sb :≤0.002, and all the other are Fe and relict element; And weld metal embrittlement-sensitive property coefficient should be met: X=(10P+5Sb+4Sn+As) × 1000≤16.
Produce the method for the ocean platform rack steel of a kind of thickness >=114mm, the steps include:
1) carry out electrosmelting, control tapping temperature at 1640-1660 DEG C;
2) at LF refining furnace, quickened lime is added according to 7.1 ~ 10 kgs/tonne of steel;
3) vacuum metling in VD stove, controls argon flow amount at 80-90NL/min;
4) vacuumize in VD stove and carry out pressurize, the control pumpdown time is no less than 30 minutes; When vacuum tightness near not higher than 67Pa time, start pressurize, control the dwell time be not less than 20 minutes;
5) in VD stove, carry out soft blow, soft argon blowing time is not less than 10 minutes;
6) continuous casting, controls starting pulling rate at 1.6 ~ 1.8 ms/min;
7) electric slag refusion and smelting is carried out: add pre-melted slag according to 5.7 ~ 8.6 kgs/tonne of steel; Toast at the temperature of 1600 ~ 1700 DEG C, baking time is 2.5 ~ 4.5 hours; Carrying out slag after oven dry; First 8 minutes of change slag blowing out, in melt cinder, add aluminum shot according to 1.0 ~ 2.0 kgs/tonne of steel carry out pre-deoxidation; Before slagging tap, add Mn powder according to a 0.5kg ~ 1.5 kg/tonne steel, before going out slag hearth, molten steel temperature control is at 1650-1750 DEG C; Adopt aluminum shot to carry out deoxidation, add aluminum shot according to the speed of 30 ~ 40 gram/minute; Enter the remelting phase, stripping speed control is in 8.0 ~ 8.5 mm/min, and burn-off rate controls in 36-38.5 kg/minute; Carry out hole cold, the time is not less than 48 hours;
8) heat electroslag base, Heating temperature is 1200 DEG C ~ 1240 DEG C, and heating rate is 10 ~ 13min/cm, controls tapping temperature at 1180 DEG C ~ 1230 DEG C;
9) segmentation is rolled: control roughing start rolling temperature at 1100 DEG C ~ 1200 DEG C, and control draught per pass 6.25 ~ 10.12%, the steel plate thickness after roughing terminates controls at 190mm ~ 240mm; Control finish rolling start rolling temperature at 840 DEG C ~ 880 DEG C, finishing temperature, at 820 DEG C ~ 840 DEG C, controls the last three passage total reductions of finish rolling and is not less than 40%;
10) carry out air cooling, control final cooling temperature between 650 DEG C ~ 700 DEG C;
11) heat-treat: adopt quenching+tempering processing mode, control normalizing Heating temperature at 920 DEG C ~ 950 DEG C, heat-up time was at 165 ~ 210 minutes; Control tempering Heating temperature at 630 DEG C ~ 670 DEG C, heat-up time was at 195 ~ 240 minutes.
12) stand-by.
The function and mechanism of each element and main technique in the present invention:
C:C is one of element of the indispensable raising steel strength of steel grade, and carbon content often increases by 0.10% tensile strength and approximately improves 60MPa, and yield strength approximately improves 20 ~ 30MPa.Along with the increase of carbon content, in steel, Fe3C increases, and hardenability also increases, and the tensile strength of steel and yield strength can improve, and plasticity and toughness index can decline, and welding property is deteriorated.This steel grade is applicable to high strength and low-temperature flexibility, wherein with C element to ensure high strength, need to ensure certain toughness and welding property, so regulation C content is tending towards medium, lower limit is 0.14%, and the upper limit is 0.192% simultaneously.
Si:Si mainly improves steel strength with solution strengthening form, is also the deoxidant element of steel grade.If but Si content is higher in steel, then reduction of area can be caused to decline, and particularly impact toughness decreased is obvious, simultaneously also unfavorable to the weldability of steel, and the intensity rank of rack steel is higher, need certain Si content proof strength to be main, therefore Si content is selected 0.15% ~ 0.35%.
Mn: in the intensity guaranteeing steel and toughness, Mn are indispensable elements.And the intensity rank of rack steel is higher, need certain Mn content proof strength to be main, therefore the content of Mn is selected 0.98 ~ 1.30%.
P, S: control P≤0.014%, S≤.008%, this is owing to only having smelting Clean Steel, the over-all properties of guarantee steel of the present invention.
Cr: select the content of Cr 0.15 ~ 0.35%, is because Cr can improve steel plate hardening capacity, ferritic phase apparition is moved to right, and the cooling rate of widening bainitic transformation is interval, promotes the formation of middle temperature transformation tissue, improves steel plate yield strength.
Ni:Ni has strengthening effect, and the Ni adding 1% can improve steel strength 20MPa.Ni can also improve the toughness, particularly low-temperature flexibility of steel significantly.Steel grade adds Ni, is that base material or simulated welding heat affected zone all significantly enhance low-temperature flexibility. and therefore steel grade of the present invention devises higher Ni content, and select lower limit to be 1.20%, the upper limit is 1.50%.
The content of Mo:Mo is selected 0.40 ~ 0.58%, is because Mo can improve steel plate hardening capacity, ferritic phase apparition is moved to right, and the cooling rate of widening bainitic transformation is interval, promotes the formation of middle temperature transformation tissue, improves steel plate yield strength.And invention steel grade needs to carry out the heat treatment process of quenching, therefore the Mo of this scope is conducive to the hardening capacity improving steel plate.
Cu:Cu is austenite former, while expansion austenite phase field, also in drawing process, facilitate austenitic formation and stabilization.The low-temperature flexibility that Ni improves steel simultaneously also improves the intensity of steel, but the hardening capacity of steel plate and hardenability can be made to increase when Ni too high levels, steel plate HAZ toughness is reduced, the welding property of deterioration steel plate.The existence of a small amount of Cu can significantly improve the corrosion potential of steel, thus improves the corrosion resistance nature of steel.Simultaneously when the content of Cu acquires a certain degree, but the precipitate of ε-Cu can improve the intensity of steel plate. the content of Cu higher than 0.18% time, the hot-short phenomenon of steel can be caused, worsen plate surface quality.Therefore, select lower limit to be 1.20%, the upper limit is 1.50%.
The effect of V:V element crystal grain thinning is comparatively strong, can improve intensity and the toughness of steel, reduce superheated susceptivity, improve thermostability, improve the temper resistance of M body.Reduce the alloy degree of sosoloid because V and C is combined to VC, so hardness reduces, when quenching temperature is increased to a lot more than AC3 point (and having longer soaking time), then VC turns into sosoloid, so hardness can improve.V has adverse influence to hardening capacity in general, but toughness is better, has added V not easily hardening crack.Medium carbon steel of the present invention adds V can improve intensity, simultaneously toughness not step-down.Therefore select lower limit to be 0.032%, the upper limit is 0.068%.
Rare elements: Sn, As and Sb element is harmful element for this invention, these three kinds of elements are very large for the temper brittleness impact of steel grade of the present invention, therefore carried out ceiling restriction for these three kinds of elements.
N :≤0.007%, steel grade N element is comparatively large for the Toughness of steel plate, has therefore done the restriction of the upper limit.
The present invention compared with prior art, utilize the pattern of traditional converter smelting-rolling cannot produce the thick ocean platform rack steel of spy of more than 114mm, and not only cost is high but also efficiency is extremely low to adopt the mode forged to produce the special thick ocean platform rack steel of more than 114mm, the mode that the present invention combines with esr by adopting electric furnace, produce not only yield strength and be at least 650MPa, thickness is at 114 ~ 152 millimeters, and cost 500 ~ 700 yuan/ton steel lower than forging mode, can manufacture, very favourable to improving product competitive power.
Accompanying drawing explanation
Accompanying drawing is metallographic structure figure of the present invention.
Embodiment
Below the present invention is described in detail:
Table 1 is the value list of various embodiments of the present invention and comparative example;
Table 2 is the main technologic parameters list of various embodiments of the present invention and comparative example;
Table 3 is various embodiments of the present invention and the list of comparative example performance monitoring situation;
Various embodiments of the present invention are produced according to following steps:
Its step:
1) carry out electrosmelting, control tapping temperature at 1640-1660 DEG C;
2) at LF refining furnace, quickened lime is added according to 7.1 ~ 10 kgs/tonne of steel;
3) vacuum metling in VD stove, controls argon flow amount at 80-90NL/min;
4) vacuumize in VD stove and carry out pressurize, the control pumpdown time is no less than 30 minutes; When vacuum tightness near not higher than 67Pa time, start pressurize, control the dwell time be not less than 20 minutes;
5) in VD stove, carry out soft blow, soft argon blowing time is not less than 10 minutes;
6) continuous casting, controls starting pulling rate at 1.6 ~ 1.8 ms/min;
7) electric slag refusion and smelting is carried out: add pre-melted slag according to 5.7 ~ 8.6 kgs/tonne of steel; Toast at the temperature of 1600 ~ 1700 DEG C, baking time is 2.5 ~ 4.5 hours; Carrying out slag after oven dry; First 8 minutes of change slag blowing out, in melt cinder, add aluminum shot according to 1.0 ~ 2.0 kgs/tonne of steel carry out pre-deoxidation; Before slagging tap, add Mn powder according to a 0.5kg ~ 1.5 kg/tonne steel, before going out slag hearth, molten steel temperature control is at 1650-1750 DEG C; Adopt aluminum shot to carry out deoxidation, add aluminum shot according to the speed of 30 ~ 40 gram/minute; Enter the remelting phase, stripping speed control is in 8.0 ~ 8.5 mm/min, and burn-off rate controls in 36-38.5 kg/minute; Carry out hole cold, the time is not less than 48 hours;
8) heat electroslag base, Heating temperature is 1200 DEG C ~ 1240 DEG C, and heating rate is 10 ~ 13min/cm, controls tapping temperature at 1180 DEG C ~ 1230 DEG C;
9) segmentation is rolled: control roughing start rolling temperature at 1100 DEG C ~ 1200 DEG C, and control draught per pass 6.25 ~ 10.12%, the steel plate thickness after roughing terminates controls at 190mm ~ 240mm; Control finish rolling start rolling temperature at 840 DEG C ~ 880 DEG C, finishing temperature, at 820 DEG C ~ 840 DEG C, controls the last three passage total reductions of finish rolling and is not less than 40%;
10) carry out air cooling, control final cooling temperature between 650 DEG C ~ 700 DEG C;
11) heat-treat: adopt quenching+tempering processing mode, control normalizing Heating temperature at 920 DEG C ~ 950 DEG C, heat-up time was at 165 ~ 210 minutes; Control tempering Heating temperature at 630 DEG C ~ 670 DEG C, heat-up time was at 195 ~ 240 minutes.
12) stand-by.
The chemical composition value list (one) of table 1 various embodiments of the present invention and comparative example
The chemical composition value list (two) of table 1 various embodiments of the present invention and comparative example
The main technologic parameters list (one) of table 2 various embodiments of the present invention and comparative example
The main technologic parameters list (two) of table 2 various embodiments of the present invention and comparative example
The main technologic parameters list (three) of table 2 various embodiments of the present invention and comparative example
The main technologic parameters list (four) of table 2 various embodiments of the present invention and comparative example
The main technologic parameters list (five) of table 2 various embodiments of the present invention and comparative example
Table 3 is various embodiments of the present invention and comparative example mechanical properties test the results list
Note: comparative example 1 and 2 is the steel adopting converter smelting.
As everyone knows, steel plate thickness is larger, then mechanical property is more difficult to ensure.But as can be seen from Table 3, comparative example 1 and 2 is compared with the present invention, although mechanical property is more or less the same, thickness differs widely, the thicklyest reach 152 millimeters.This just illustrates, the present invention is under ensureing that mechanical property meets the prerequisite of the new market requirement, and meeting again user needs steel plate thickness to be greater than the new demand of more than 114 millimeters.
Above-described embodiment is only the best and exemplifies, and is not the restriction to embodiments of the present invention.
Claims (1)
1. produce the method for the ocean platform rack steel of a kind of thickness >=114mm, the steps include:
1) carry out electrosmelting, control tapping temperature at 1640-1660 DEG C;
2) at LF refining furnace, quickened lime is added according to 7.1 ~ 10 kgs/tonne of steel;
3) vacuum metling in VD stove, controls argon flow amount at 80-90NL/min;
4) vacuumize in VD stove and carry out pressurize, the control pumpdown time is no less than 30 minutes; When vacuum tightness is down to not higher than 67Pa, start pressurize, the control dwell time is not less than 20 minutes;
5) in VD stove, carry out soft blow, soft argon blowing time is not less than 10 minutes;
6) continuous casting, controls starting pulling rate at 1.6 ~ 1.8 ms/min; Strand component and weight percent content are: C:0.14 ~ 0.192, Si:0.15 ~ 0.35, Mn:0.98 ~ 1.3, P :≤0.014, S :≤0.008, Cr:0.15 ~ 0.35, Ni:1.2 ~ 1.5, Mo:0.40 ~ 0.58, Cu:0.15 ~ 0.26, V:0.032 ~ 0.068, [O]≤0.0003, [N]≤0.007, Sn :≤0.003, As :≤0.003, Sb :≤0.002, and all the other are Fe and relict element;
7) electric slag refusion and smelting is carried out: add pre-melted slag according to 5.7 ~ 8.6 kgs/tonne of steel; Toast at the temperature of 1600 ~ 1700 DEG C, baking time is 2.5 ~ 4.5 hours; Carrying out slag after oven dry; First 8 minutes of change slag blowing out, in melt cinder, add aluminum shot according to 1.0 ~ 2.0 kgs/tonne of steel carry out pre-deoxidation; Before slagging tap, add Mn powder according to a 0.5kg ~ 1.5 kg/tonne steel, before going out slag hearth, molten steel temperature control is at 1650-1750 DEG C; Adopt aluminum shot to carry out deoxidation, add aluminum shot according to the speed of 30 ~ 40 gram/minute; Enter the remelting phase, stripping speed control is in 8.0 ~ 8.5 mm/min, and burn-off rate controls in 36-38.5 kg/minute; Carry out hole cold, the time is not less than 48 hours;
8) heat electroslag base, Heating temperature is 1200 DEG C ~ 1240 DEG C, and heating rate is 10 ~ 13min/cm, controls tapping temperature at 1180 DEG C ~ 1230 DEG C;
9) segmentation is rolled: control roughing start rolling temperature at 1100 DEG C ~ 1200 DEG C, and control draught per pass 6.25 ~ 10.12%, the steel plate thickness after roughing terminates controls at 190mm ~ 240mm; Control finish rolling start rolling temperature at 840 DEG C ~ 880 DEG C, finishing temperature, at 820 DEG C ~ 840 DEG C, controls the last three passage total reductions of finish rolling and is not less than 40%;
10) carry out air cooling, control final cooling temperature between 650 DEG C ~ 700 DEG C;
11) heat-treat: adopt normalizing+temper mode, control normalizing Heating temperature at 920 DEG C ~ 950 DEG C, heat-up time was at 165 ~ 210 minutes; Control tempering Heating temperature at 630 DEG C ~ 670 DEG C, heat-up time was at 195 ~ 240 minutes;
12) stand-by.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310166416.6A CN103320708B (en) | 2013-05-08 | 2013-05-08 | Offshore platform rack steel with thickness of more than or equal to 114 mm, and production method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310166416.6A CN103320708B (en) | 2013-05-08 | 2013-05-08 | Offshore platform rack steel with thickness of more than or equal to 114 mm, and production method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103320708A CN103320708A (en) | 2013-09-25 |
| CN103320708B true CN103320708B (en) | 2015-03-11 |
Family
ID=49189744
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310166416.6A Active CN103320708B (en) | 2013-05-08 | 2013-05-08 | Offshore platform rack steel with thickness of more than or equal to 114 mm, and production method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103320708B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103695803B (en) * | 2013-12-19 | 2015-12-30 | 江阴兴澄特种钢铁有限公司 | The heavy thickness rack steel that low-carbon-equivalent low-temperature uses and manufacture method thereof |
| CN111926260B (en) * | 2020-08-24 | 2021-12-31 | 东北大学 | Preparation method of low-magnetism stainless steel medium plate with yield strength of 785MPa |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101709432B (en) * | 2009-12-26 | 2011-10-26 | 舞阳钢铁有限责任公司 | Steel for large-thickness hardening and tampering ocean platform and production method thereof |
| CN102796952A (en) * | 2011-05-24 | 2012-11-28 | 舞阳钢铁有限责任公司 | High-thickness steel plate for ocean platform and production method for steel plate |
| CN102747300B (en) * | 2012-06-27 | 2014-10-01 | 攀钢集团成都钢钒有限公司 | Seamless steel pipe for high-strength and high-toughness structure and manufacturing method thereof |
-
2013
- 2013-05-08 CN CN201310166416.6A patent/CN103320708B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN103320708A (en) | 2013-09-25 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109338035B (en) | Steel for wind driven generator gear box bearing and production method thereof | |
| CN107475620B (en) | Low-temperature pressure container quenching and tempering type A537Cl2 steel plate and its production method | |
| CN104911503B (en) | A kind of special thick quenched ocean engineering EH40 steel and preparation method thereof | |
| CN104264069B (en) | A kind of special think gauge X70 pipe line steel and manufacture method thereof | |
| CN109161791A (en) | 690MPa rank ship and Marine Engineering Steel and its manufacturing method with superior low-temperature toughness | |
| CN104674121B (en) | A kind of high elastoresistance armour plate and its manufacture method | |
| CN102796967B (en) | 800 MPa economic corrosion-resistance and high-strength steel plate | |
| CN104357742B (en) | 420MPa high-thickness hot-rolled steel sheet for ocean engineering and production method thereof | |
| CN103031498A (en) | Manufacture method of extremely thick ocean engineering steel plate with low compression ratio and super high-strength strain age | |
| CN104894487A (en) | High-strength high-toughness steel for valves of oil drilling platforms and technology for manufacturing high-strength high-toughness steel | |
| CN103397272B (en) | There is wear-resisting steel plate of low crack-sensitivity exponential sum high strength and preparation method thereof | |
| CN103205643B (en) | A kind of high hardness wear-resisting steel pipe and manufacture method thereof | |
| CN102747290A (en) | Economical wear-resistant steel and manufacturing method thereof | |
| EP4375390A1 (en) | Hot-rolled, low-temperature-resistant, h-shaped steel with grade of yield strength of 420 mpa, and preparation method therefor | |
| CN104073731B (en) | Production method for ultrahigh-strength ship plate adopting direct quenching process | |
| WO2023165617A1 (en) | High-strength and high-toughness steel with long service life and wall thickness of ≥ 600 mm for valve body of subsea christmas tree, and heat treatment method and production method therefor | |
| CN103866203A (en) | Seamless steel pipe for large-aperture high-strength bridge and TMCP production method thereof | |
| CN107675090B (en) | A kind of Brinell hardness 650HBW rank high-wearing feature steel plate and preparation method thereof | |
| CN111155022B (en) | 390 MPa-grade polar region hull structural steel with low-temperature toughness and preparation method thereof | |
| CN107557662A (en) | Quenching and tempering type 800MPa levels low-cost and easy-to welds steel plate and its production method | |
| CN103320708B (en) | Offshore platform rack steel with thickness of more than or equal to 114 mm, and production method thereof | |
| CN103233185B (en) | A kind of X100 pipeline steel and production method thereof | |
| CN103147016B (en) | Cryogenic vessel steel of minus 110 DEG C and manufacturing method thereof | |
| CN110055470B (en) | Container corner fitting and heat treatment process thereof | |
| CN104357745B (en) | A kind of composite reinforcing steel bar of yield strength >=600MPa and production method |
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 | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20180329 Address after: No. 215, Wuchang Avenue, Hubei, Ezhou, Hubei Patentee after: Echeng Iron and Steel Co., Ltd., of Wuhan Iron and Steel Group Address before: 430080 Wuhan, Hubei Friendship Road, No. 999, Wuchang Patentee before: Wuhan Iron & Steel (Group) Corp. |
|
| CP01 | Change in the name or title of a patent holder | ||
| CP01 | Change in the name or title of a patent holder |
Address after: No. 215, Wuchang Avenue, Hubei, Ezhou, Hubei Patentee after: Baowu group Echeng Iron and Steel Co., Ltd Address before: No. 215, Wuchang Avenue, Hubei, Ezhou, Hubei Patentee before: WUHAN IRON AND STEEL GROUP ECHENG IRON AND STEEL Co.,Ltd. |