CN102703807B - Steel with minus 80-degree C impact absorbing energy no less than 100J for ocean engineering and production method thereof - Google Patents
Steel with minus 80-degree C impact absorbing energy no less than 100J for ocean engineering and production method thereof Download PDFInfo
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- CN102703807B CN102703807B CN 201210209436 CN201210209436A CN102703807B CN 102703807 B CN102703807 B CN 102703807B CN 201210209436 CN201210209436 CN 201210209436 CN 201210209436 A CN201210209436 A CN 201210209436A CN 102703807 B CN102703807 B CN 102703807B
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Abstract
The invention relates to steel with minus 80-degree C impact absorbing energy no less than 100J for ocean engineering and a production method thereof, wherein the chemical components and weight percentage are C is equal to 0.02 to 0.06%, Si is equal to 0.01 to 0.15%, Ni is equal to 0.10 to 2.5%, P is smaller than and equal to 0.005%, S is smaller than and equal to 0.001%, A1s is smaller than and equal to 0.01 %, Ce is equal to 0.005 to 0.080%, O is smaller than and equal to 0.001%, N is smaller than and equal to 0.0015%, and H is smaller than and equal to 0.0005%, and the balance is Fe and inevitable impurities. The process is as follows: deep desulfurization of molten iron, refining in LF furnace, vacuum treatment in RH furnace, continuous casting and heating, sectional casting, cooling, tempering and standby application. The steel is in the environment from minus 30-degree C to minus 60-degree C, and the metallurgical structures in the steel are ferrito martensite and ferrite with the ferrito martensite forming no less than 50% of the volume percentage, as a result minus 80-degree C impact absorbing energy KV2 is no less than 100J, then the use safety coefficient of the steel plate is improved, the components and process are simple, and the manufacturing cost is relatively low.
Description
Technical field
The present invention relates to low-carbon and low-alloy high strength engineering steel and production method thereof, specifically belong to oceanographic engineering steel and the production method thereof of a kind of-80 ℃ of impact absorbing energy 〉=100J.
Background technology
The south pole of the earth, the arctic and surrounding waters thereof, environment is abominable throughout the year, temperature is-30 ℃～-60 ℃ scopes, build Steel Structure Work in this area, difficulty is bigger, and steel performance is had relatively high expectations, and especially requires steel plate to have good low-temperature impact toughness, Cold Brittleness Transition Temperature should be lower than-60 ℃, could guarantee Steel Structure Work safety.In actual Steel Structure Work design, if envrionment temperature is-60 ℃, then require steel plate-80 ℃ impelling strength should reach certain level, to improve the steel construction safety coefficient.General offshore engineering structure hits the toughness quality grade with steel drift and only requires-60 ℃ at present, does not also have impelling strength specification of quality under-80 ℃ of temperature.
Before the application, Chinese patent application number is 201110359475.6 patent documentation, discloses " a kind of superstrength offshore engineering structure with steel plate and production method thereof ", its chemical element is formed and is comprised C0.05-0.13%, Si0.1-0.4%, Mn0.7-1.7%, Alt0.01-0.04%, Nb0.02-0.05%, V0-0.05%, Ti0.008-0.02%, Cr0-0.6%, Mo0.2-0.4%, Ni0.15-0.8%, Cu0-0.5%, B0-0.0011%, P＜0.01%, S＜0.005%, O＜0.0010%, N＜0.005%, H＜0.00015%, Nb+V+Ti≤0.12%, all the other are Fe and inevitable impurity.Adopt different chemical ingredients, rolling and heat treatment process parameter at the different thickness specification.Production technique comprises desulfurizing iron, converter top and bottom complex blowing, vacuum-treat, continuous casting, controlled rolling and controlled cooling, quenching, tempering.The deficiency of its existence, the alloying element kind is too many, makes production process restive, and contains expensive alloy element Mo, and steel plate need cause technical process long through quenching, tempering heat treatment, and energy consumption is higher.
Chinese patent application number is 201110355557.3 patent documentation, " a kind of big thickness oceanographic engineering steel plate and production method thereof " disclosed, its chemical ingredients and content are: C:0.07%～0.09%, Si:0.15%～0.40%, Mn:1.40%～1.50%, P≤0.012%, S≤0.005%, Ni:0.60%～0.70%, Nb:0.030%～0.040%, Al:0.020%～0.045%, Mo:0.13%～0.17%, V:0.04%～0.05%, Ti:0.012%～0.020%, surplus is Fe and unavoidable impurities.Weak point is steel grade alloying element kind complexity, increases the production difficulty.
Chinese patent application number is 201110341100.7 patent documentation, " the thick low compression ratio oceanographic engineering of a kind of 80mm steel plate and manufacture method thereof " disclosed, its chemical ingredients is by weight percentage: C0.12～0.16%, Si0.20～0.40%, Mn1.20～1.60%, P≤0.010%, S≤0.003%, Nb0.025～0.050%, V0.030～0.050%, Ti0.010～0.020%, Cr≤0.20%, Ni0.10～0.40%, Cu≤0.20%, Mo≤0.08%, Al0.0250～0.050%, O≤20ppm, N≤40ppm, H≤3ppm, surplus is Fe and unavoidable impurities; Adopt cooling controlling and rolling controlling process, Heating temperature is 1180 ℃～1250 ℃ before rolling, 1000～1100 ℃ of roughing temperature, 850～880 ℃ of finish rolling start rolling temperatures; Roll back laminar flow cooling, 640～680 ℃ of final cooling temperatures, 5～15 ℃/s of rate of cooling; Carry out normalizing treatment, normalizing temperature is 890～910 ℃, and temperature rise rate is 1.4min/mm, and soaking time is 50～90min.Its deficiency is that element is many in the steel, has strengthened the production difficulty, and steel plate need normalizing thermal treatment, has reduced production efficiency.
Chinese patent application number is 201110056854.8 patent documentation, disclose " yield strength 500MPa level offshore platform structure with Plate Steel and manufacture method ", the chemical ingredients of this steel plate is by mass percentage: C:0.05～0.09%, Si:0.25～0.38%, Mn:1.3～1.8%, P :≤0.006%, S :≤0.002%, Al:0.02～0.04%, Cr:0.15～0.25%, Ni:0.2～1.0%, Cu:0.18～0.25%, Mo:0.15～0.20%, V:0.025～0.040%, Ti:0.01～0.02%, Nb:0.06～0.08%, surplus is Fe; Production technique is: raw material is through smelting, and continuous casting becomes blank, with blank heating, carries out the controlled rolling of two stages in austenite recrystallization district and non-recrystallization district; Carrying out two-phase region after rolling quenches and high tempering thermal treatment.Its weak point is in the steel element with aforesaid equally more, and production process requires to quench and high tempering thermal treatment at two-phase region, has increased the production difficulty.
Above-mentioned existing patent documentation, its common deficiency is that element is more in the steel, and Mn content is higher than 1.0%, because of Mn easily is mingled with S formation MnS in structure iron, reduce the mechanical property of steel, especially worsen the low-temperature impact toughness of steel, so for the steel that requires-80 ℃ of low-temperature impact toughness, the existence of MnS is very disadvantageous.
Summary of the invention
The objective of the invention is to solve prior art to the oceanographic engineering steel in-30～-60 ℃ of environment, safety coefficient is relatively low, using and, provide a kind of yield strength to be not less than 330MPa ,-80 ℃ of impact absorbing energy KV steel plate from the influential deficiency of steel plate Years Of Service
2〉=100J, metallographic structure is bainite and ferrite, and wherein bainite volume percent occupancy volume is not less than 50%, and all the other volume percent occupancy volumes are the simple offshore engineering structure of ferrite, composition and technology steel and production method thereof.
Realize the measure of above-mentioned purpose:
The oceanographic engineering steel of a kind of-80 ℃ of impact absorbing energy 〉=100J, its chemical ingredients and weight percent content are: C:0.02～0.06%, Si:0.01～0.15%, Ni:0.10～2.50%, P≤0.005%, S≤0.001%, Als≤0.01%, Ce:0.005～0.080%, O≤0.001%, N≤0.0015%, H≤0.00005%, surplus is Fe and unavoidable impurities; Yield strength is not less than 330MPa ,-80 ℃ of impact absorbing energy KV
2〉=100J, metallographic structure is bainite and ferrite, and wherein bainite volume percent occupancy volume is not less than 50%, and all the other volume percent occupancy volumes are ferrite.
Produce the method for the oceanographic engineering of a kind of-80 ℃ of impact absorbing energy 〉=100J, its step with steel:
1) molten iron is carried out dark desulfurization, S≤0.0008% in the control molten iron;
2) in the LF stove, carry out refining, and S≤0.0009% in the control molten iron;
3) in the RH stove, carry out vacuum-treat, and O≤0.001% in the control molten iron, N≤0.0015%, H≤0.00005%;
4) continuous casting and to strand heating, the control slab heating temperature is at 1220～1350 ℃;
5) segmentation is rolled, and control roughing start rolling temperature is at 1100～1200 ℃, and finish rolling section finishing temperature is at 720～880 ℃;
6) cooling: at first carrying out the laminar flow cooling, is under 5.0～25 ℃/second in speed of cooling, is cooled to 200～600 ℃, naturally cools to room temperature then;
7) carry out temper, the control tempering temperature is at 200～660 ℃;
8) stand-by.
The foundation of main alloy element content of the present invention and processing parameter setting:
Extremely cold regional large-scale steel structure requires steel higher with steel, and foreign matter content is controlled at lower level as much as possible.Added the Mn of certain content in the ordinary steel, the MnS that forms with S is mingled with, belong to yielding inclusion, in the operation of rolling, be out of shape along rolling direction, and cut the continuity of Fe atomic arrangement in the steel, form intrinsic crack defect in steel inside, reduced the mechanical property of steel significantly, at low temperatures, the impelling strength of steel is responsive especially to subsurface defect in the steel, and small MnS is mingled with the impelling strength that can significantly reduce steel.Therefore, the application does not add Mn with existing patented technology and the outstanding different the application of being of popular production technique, and S content in the steel is controlled at S≤0.002%, purpose is to reduce in the steel and forms MnS and be mingled with quantity, improve the purity of steel, can put forward the mechanical property of excellent steel, especially can increase substantially the low-temperature impact toughness of steel.
Manufacture method: molten iron is handled through taking off S, the steelmaking process refined molten steel is mingled with in the steel and objectionable constituent such as N, O gas to reduce, continuous pouring becomes slab, and purpose is foreign matter content in the steel and objectionable constituent are reduced to lower level, and is all favourable to mechanical property, the processing performance of steel plate; Steel billet heating, soaking temperature are set at 1220～1350 ℃: purpose is strand to be grilled thoroughly in this temperature range, is convenient to rolling; Start rolling temperature 〉=1100 ℃, purpose are to adopt high temperature to depress broken thick as-cast structure greatly, lay the foundation for steel plate has good low-temperature impact toughness; Finishing temperature: 720～880 ℃, this temperature range belongs to non-recrystallization temperature, is to avoid the recrystallize phenomenon takes place in the steel in the rolling purpose of this non-recrystallization temperature scope, and containment forms thick crystal grain, worsens the impelling strength of steel.At 720～880 ℃ of rolling the application's steel grades of temperature range, can obtain tiny, uniform crystal grain and microtexture, have good low-temperature impact toughness.The purpose of 200～660 ℃ of temper is to eliminate the residualinternal stress that steel plate produces in manufacturing processed, makes steel plate have good comprehensive mechanical properties.
Below select the reason of each alloying element and composition range in the summary steel of the present invention.
C is a requisite alloying element in the steel, for guaranteeing that steel has certain intensity, for the yield strength that makes the present patent application steel grade is not less than 330MPa, need certain C content in the steel, but too high C content reduces the impelling strength of steel strongly, the intensity of overall equilbrium steel and low-temperature impact toughness are defined as the span of C content: 0.02～0.06%.
The common Si that adds certain content improves the intensity of steel in the mode of replacing solution strengthening, but should not too much add in the Si structure iron, otherwise will damage the low-temperature impact toughness of steel, so the composition range of Si is set at: 0.01～0.15%.
Add the alloying element Ni of certain content in the Ni steel, can significantly improve the low-temperature impact toughness of steel.Ni obtains corresponding bainite and ferritic content by cooling controlling and rolling controlling process in the present patent application.Because of Ni is an expensive alloy element, excessive interpolation not only causes waste, also increases cost, so the scope of Ni content is set at 0.10～2.50%.
Als:Als generally is used for the steelmaking process deoxidation, but the O among the Yi Yugang, N reaction generates erose Al
2O
3, AlN etc., reduce the mechanical property of steel, especially can reduce the low-temperature impact toughness of steel significantly, so the Al content of the present patent application is controlled at Als≤0.01%.
S is a deleterious impurity element in the steel, easily forms sulfide inclusion in steel, and the mechanical property that reduces steel strongly is toughness especially, therefore S content is low more good more, but if limit its content low excessively, can increase the production difficulty, improve production cost, so the S content of steel is limited to S≤0.002%.
P is a harmful element in the steel, significantly reduces the low-temperature impact toughness of steel, and it is higher that the P cost is taken off in steel-making, in this application P content is set at P≤0.005%.
Ce belongs to micro alloying element in structure iron, in the present patent application, add 0.005～0.080% Ce, purpose is to improve the inclusion characteristic that can not eliminate fully in the steel, make steel inclusion be tiny, circular, disperse and distribute, with inclusion to the infringement of the low-temperature impact toughness of steel fall cause minimum.The tiny Ce of the containing complex chemical compound particle that reactions such as remaining N, O are produced in Ce and the steel can suppress the crystal boundary expansion in the steel plate manufacturing processed in addition, and is favourable to crystal grain thinning.
N, O, H are harmful element, and be unfavorable to low-temperature impact toughness, reduces the mechanical property and the processing characteristics of steel, so N, O, H content are controlled at respectively: O≤0.001%, N≤0.0015%, H≤0.00005%.
The present invention compared with prior art, in-30～-60 ℃ of environment, because the metallographic structure in its steel is bainite and ferrite, and bainite volume percent occupancy volume is not less than 50%, so can make-80 ℃ of impact absorbing energy KV
2〉=100J, thus the coefficient safe in utilization of steel plate is improved, and composition and technology are simple, and manufacturing cost is lower relatively.
Description of drawings
Accompanying drawing is metallographic structure figure of the present invention.
Embodiment
Below the present invention is described in detail:
Table 1 is the component 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 Comparative Examples mechanical properties test the results list.
Various embodiments of the present invention are according to following steps production:
Its step:
1) molten iron is carried out dark desulfurization, S≤0.0008% in the control molten iron;
2) in the LF stove, carry out refining, and S≤0.0009% in the control molten iron;
3) in the RH stove, carry out vacuum-treat, and O≤0.001% in the control molten iron, N≤0.0015%, H≤0.00005%;
4) continuous casting and to strand heating, the control slab heating temperature is at 1220～1350 ℃;
5) segmentation is rolled, and control roughing start rolling temperature is at 1100～1200 ℃, and finish rolling section finishing temperature is at 720～880 ℃;
6) cooling: at first carrying out the laminar flow cooling, is under 5.0～25 ℃/second in speed of cooling, is cooled to 200～600 ℃, naturally cools to room temperature then;
7) carry out temper, the control tempering temperature is at 200～660 ℃;
8) stand-by.
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 is various embodiments of the present invention and Comparative Examples mechanical properties test the results list
According to composition requirement of the present invention, smelted 8 batches of steel of the present invention, chemical ingredients sees Table 1, and table 2 is the processing parameter of production steel of the present invention, and table 3 is the service check result.As seen, steel of the present invention has good low-temperature impact toughness, and-80 ℃ of impact absorbing energies all are not less than 100J.And compared steel is higher owing to C content, and Ni content is lower, and has added the Mn more than 1.0%, in the production process finish to gauge postcooling technology, tempering process etc. is not all done requirement, and its-80 ℃ of impact absorbing energies are very low, are difficult to use in the cold district Steel Structure Work.
Claims (2)
1. the oceanographic engineering steel of-80 ℃ of impact absorbing energy 〉=100J, its chemical ingredients and weight percent content are: C:0.02～0.06%, Si:0.01～0.15%, Ni:0.10～2.50%, P≤0.005%, S≤0.001%, Als≤0.01%, Ce:0.005～0.080%, O≤0.001%, N≤0.0015%, H≤0.00005%, surplus is Fe and unavoidable impurities; Yield strength is not less than 330MPa ,-80 ℃ of impact absorbing energy KV
2〉=100J, metallographic structure is bainite and ferrite, and wherein bainite volume percent occupancy volume is not less than 50%, and all the other volume percent occupancy volumes are ferrite.
2. the oceanographic engineering of described a kind of-80 ℃ of impact absorbing energy 〉=100J of production claim 1 is with the method for steel, its step:
1) molten iron is carried out dark desulfurization, S≤0.0008% in the control molten iron;
2) in the LF stove, carry out refining, and S≤0.0009% in the control molten iron;
3) in the RH stove, carry out vacuum-treat, and O≤0.001% in the control molten iron, N≤0.0015%, H≤0.00005%;
4) continuous casting and to strand heating, the control slab heating temperature is at 1220～1350 ℃;
5) segmentation is rolled, and control roughing start rolling temperature is at 1100～1200 ℃, and finish rolling section finishing temperature is at 720～880 ℃;
6) cooling: at first carrying out the laminar flow cooling, is under 5.0～25 ℃/second in speed of cooling, is cooled to 200～600 ℃, naturally cools to room temperature then;
7) carry out temper, the control tempering temperature is at 200～660 ℃;
8) stand-by.
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| CN 201210209436 CN102703807B (en) | 2012-06-25 | 2012-06-25 | Steel with minus 80-degree C impact absorbing energy no less than 100J for ocean engineering and production method thereof |
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| CN 201210209436 CN102703807B (en) | 2012-06-25 | 2012-06-25 | Steel with minus 80-degree C impact absorbing energy no less than 100J for ocean engineering and production method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103243261B (en) * | 2013-05-03 | 2015-04-08 | 武汉钢铁(集团)公司 | Fire-resistant steel of ocean platform with excellent anti-fatigue performance and production method thereof |
| CN104630628B (en) * | 2015-03-06 | 2017-06-13 | 武汉钢铁(集团)公司 | A kind of tensile strength >=800MPa grades of welded structural steel and production method |
| CN109022708A (en) * | 2018-09-19 | 2018-12-18 | 江阴兴澄特种钢铁有限公司 | The low-carbon used under a kind of condition of ultralow temperature easily welds normalizing acid-resistant pipeline steel plate |
| CN113832303B (en) * | 2021-09-10 | 2022-08-12 | 湖州盛特隆金属制品有限公司 | Method for smelting ultra-low carbon and ultra-low silicon hastelloy by hastelloy waste |
| CN115976424B (en) * | 2022-12-14 | 2024-03-08 | 南阳汉冶特钢有限公司 | DH40 crack-arrest steel plate for ocean platform and production method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003342670A (en) * | 2002-05-24 | 2003-12-03 | Nippon Steel Corp | Non-heat treated high tensile steel having excellent toughness |
| JP3785392B2 (en) * | 2002-10-23 | 2006-06-14 | 新日本製鐵株式会社 | Thick steel with excellent fatigue crack propagation characteristics and its manufacturing method |
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| SU1724718A1 (en) * | 1990-01-03 | 1992-04-07 | Производственное объединение "Ижорский завод" | Corrosion-resistant magnetic-mild steel |
| CN1296509C (en) * | 2005-03-10 | 2007-01-24 | 武汉钢铁(集团)公司 | High strength weldable ageing hardening steel and its production method |
| CN100441720C (en) * | 2006-12-18 | 2008-12-10 | 马鞍山钢铁股份有限公司 | Process for producing anti-corrosion carbon constructional steel |
| CN101812647B (en) * | 2009-02-25 | 2012-10-10 | 宝山钢铁股份有限公司 | Diphase stainless steel and manufacturing method thereof |
| CN102392192B (en) * | 2011-11-01 | 2012-12-05 | 南京钢铁股份有限公司 | Steel plate with thickness of 80mm and low compression ratio for ocean engineering and manufacturing method thereof |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003342670A (en) * | 2002-05-24 | 2003-12-03 | Nippon Steel Corp | Non-heat treated high tensile steel having excellent toughness |
| JP3785392B2 (en) * | 2002-10-23 | 2006-06-14 | 新日本製鐵株式会社 | Thick steel with excellent fatigue crack propagation characteristics and its manufacturing method |
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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. |
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