CN103103455A - Steel plate for 600MPa-level hydroelectric pressure steel tube and preparation method thereof - Google Patents
Steel plate for 600MPa-level hydroelectric pressure steel tube and preparation method thereof Download PDFInfo
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- CN103103455A CN103103455A CN2012105792084A CN201210579208A CN103103455A CN 103103455 A CN103103455 A CN 103103455A CN 2012105792084 A CN2012105792084 A CN 2012105792084A CN 201210579208 A CN201210579208 A CN 201210579208A CN 103103455 A CN103103455 A CN 103103455A
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Abstract
The invention relates to a steel plate for a 600MPa-level hydroelectric pressure steel tube and a preparation method thereof. The steel plate comprises the chemical ingredients by weight percent: 0.06-0.09% of C, 0.20-0.40% of Si, 1.4-1.6% of Mn, less than or equal to 0.015% of P, less than or equal to 0.005% of S, 0.02-0.04% of Nb, 0.20-0.40% of Ni, 0.10-0.30% of Cr, 0.10-0.30% of Mn, 0.03-0.05% of V, 0.01-0.02% of T and the balance of Fe and inevitable impurities. The preparation method comprises the steps of: by adopting molten iron and steel scrap after desulphurization pretreatment as materials, carrying out the procedures of smelting by a converter smelting, LF (low-frequency) refining, RH (relative humidity) vacuum treatment, continuous casting, heating, rolling, cooling and quenching and tempering heat treatment and the like to obtain the steel plate for the 600MPa-level hydroelectric pressure steel tube. The steel plate has the advantages that the tensile strength is greater than 600MPa; the steel plate is good in plasticity, and excellent in low-temperature impact toughness and welding property, has excellent lamellar tearing resistance, and can be widely applied to manufacturing auxiliary facilities such as diversion penstocks, primary ribbed plates, branch pipes and volutes in a hydropower plant dam.
Description
Technical field
The invention belongs to the low alloy steel field, particularly a kind of 600MPa level hydraulic power pressure steel for steel pipes plate and manufacture method thereof.
Background technology
Water-power steel is mainly used in the manufacturing of the off-set facility such as the diversion penstock, one-level floor, bifurcated pipe, spiral case in the factory dam, requires steel plate to have enough intensity, good plasticity, good toughness and welding property.Domestic pressure steel pipe of hydropower station mainly adopts the steel of 3 intensity ranks with steel, i.e. 500MPa level, 600MPa level and 800MPa.Other steel plate of 500MPa level is generally used in the early stage construction of hydropower stations, mainly contains these two kinds of domestic trade mark 16MnR and U.S. trade mark ATSM A537CL1.Along with the numerical value such as the installed capacity in power station and head are increasing, steel plate is had higher requirement-used have the more steel plate of high strength, better low-temperature flexibility, better welding property, the steel penstock in domestic water power station mainly uses the product of 600MPa level at present, as Wuyang WDB620, Shoudu Iron and Steel Co SG610CF, Anshan iron and steel plant ADB610D etc.
Present domestic same level steels for pressure vessel use and manufacture method thereof are as follows:
Chinese patent application numbers 200510019165.4 discloses a kind of " steel in use for soldering pressure pipe in hydraulic power station under large line energy and production method thereof " its chemical composition massfraction and has been: C: 0.04～0.12%, Si:0.10～1.00%, Mn:1.10～2.00%, Cr :≤2.00%, Ni:0.26～0.50%, Cu≤0.50%, Ti:0.01～0.04%, Nb≤0.05%, B:0.0005～0.003%, N:0.0003～O.005%, O:0.003～0.007%, P≤0.02%, S≤0.015%, adopt the production of off-line hardening and tempering process, advantage is not add Mo, the alloying elements such as V, reduced manufacturing cost, and steel plate can bear the advanced weldprocedures such as Large Heat Input Welding.Weak point is that the tensile strength of steel plate is the 500MPa level, has not met the service requirements of present pressure steel pipe of hydropower station.
China Patent Publication No. CN1932063A discloses a kind of " high strength and low welding crack sensitivity Plate Steel and production method thereof ", its chemical composition massfraction is: C:0.04～0.09%, Si:0.15～0.55%, Mn:1.00～1.60%, P≤0.015%, S≤0.006%, Cr :≤0.30%, Ni:0.15～0.40%, Mo≤0.30%, Cu≤0.30%, V:0.02～0.06%, Nb:0.005～0.05%, Als:0.010～0.04%, Pcm≤0.20%, Ceq≤0.42%, adopt online direct quenching+off-line tempering process to produce the steel plate of tensile strength 〉=610MPa, has production technique simple, the characteristics such as cost is low, weak point is to have adopted the Cu microalloying, easily cause strand to crack.
China Patent Publication No. CN101096738A discloses " low welding crack sensitivity steel plate and production method thereof ", its chemical composition massfraction is: C≤0.07%, Si:0.15～0.40%, Mn:1.00～1.60%, P≤0.015%, S≤0.010%, Cr :≤0.30%, Ni :≤0.50%, Mo≤0.30%, Cu≤0.30%, V :≤0.08%, Nb :≤0.08%, Ti:0.010～0.020%, B≤0.003%, adopt the TMCP+ tempering process to produce the steel plate of tensile strength 〉=610MPa, weak point is to have adopted three stage control rolling technologys, strengthened rolling load, require milling train to have larger moment of torsion and rolling load.
Summary of the invention
The purpose of this invention is to provide a kind of tensile strength greater than 600MPa, have good plasticity, good low-temperature impact toughness and the hydraulic power pressure steel for steel pipes plate of welding property, this steel plate is mainly used in the manufacturing of hydropower station pressure pipeline.
Technical scheme of the present invention is as follows:
The chemical composition of steel plate of the present invention is C:0.06～0.09%, Si:0.20～0.40%, Mn:1.4～1.6%, P by weight percentage :≤0.015%, S :≤0.005%, Nb:0.02～0.04%, Ni:0.20～0.40%, Cr:0.10～0.30%, Mo:0.10～0.30%, V:0.03～0.05%, Ti:0.01～0.02%, surplus are Fe and inevitable impurity.
The operational path that the present invention mainly adopts is: hot metal pretreatment-converter smelting-LF refining-RH vacuum-treat-sheet billet continuous casting-heating of plate blank-dephosphorization-controlled rolling-ACC is cooling-and modified thermal treatment.
Manufacture method of the present invention, key step and processing parameter are as follows:
1, smelt
Converter smelting adopts the process pretreated molten iron of desulfurization and steel scrap as raw material.Adopt single slag technique to smelt, high carbon ferromanganese and silumin deoxidation alloying, the tapping pushing off the slag guarantees a catch carbon success, Tapping Temperature of Bof is controlled at 1620 ~ 1640 ℃.The RH operation adopts the dark degasification technique of circulation, guaranteeing significantly to reduce the gas contents such as hydrogen, oxygen, nitrogen under the stable prerequisite of liquid steel temperature, reduce obnoxious flavour to the disadvantageous effect of steel, the chemical component weight per-cent of the molten steel that finally obtains is C:0.06～0.09%, Si:0.20～0.40%, Mn:1.4～1.6%, P :≤0.015%, S :≤0.005%, Nb:0.02～0.04%, Ni:0.20～0.40%, Cr:0.10～0.30%, Mo:0.10～0.30%, V:0.03～0.05%, Ti:0.01～0.02%, surplus are Fe and inevitable impurity.
2, continuous casting
Continuous caster is straight curved type continuous caster, and detailed process and parameter are controlled as follows: use the low-carbon low-alloy steel covering slag, bits will keep dry, and the liquid slag layer gauge control is at 10 ~ 15mm; Use carbon-free middle covering agent, be unkitted and forbid when long nozzle or long nozzle do not immerse the molten steel face to add insulating covering agent to middle bag impact zone; Keep the constant speed cast, pouring speed is controlled at 0.9～1.0m/min.In the normal process situation, same heat pulling rate fluctuation does not allow to surpass ± 0.1m/min; Adopt induction stirring, electric current 280A; The crystallizer inflow temperature is controlled at 38 ± 1 ℃, and the secondary cooling water temperature is controlled at 22 ~ 25 ℃; The strand straightening temperature is controlled at 950 ~ 1000 ℃, and the temperature difference of strand broad ways must not be over 50 ℃; Carry out the protection cast, guard against secondary oxidation of steel and air-breathing nitrogen pick-up; Strand macroscopic examination result should satisfy category-B center segregation≤1.5 grade, middle crack≤1.5 grade, center porosity≤1.0 grade.
3, heating
Fully guarantee billet heating temperature and soaking time.Heating and temperature control is at 1210 ℃ ~ 1250 ℃, total time inside furnace 〉=270min, and wherein soaking time 〉=50min, guarantee the abundant solid solution of alloying element, board briquette is even.Furnace gas atmosphere adopts weak oxide or reducing atmosphere to burn steel, and micro-pressure operation avoids casting billet surface to generate excessive oxidation iron sheet and the difficult iron scale of removing.
4, rolling and cooling
Rolling employing two-stage control is rolling, i.e. austenite recrystallization district's controlled rolling (usually claiming rough rolling step) and austenite non-recrystallization zone controlled rolling (usually claiming the finish rolling stage).Strengthen pass deformation during roughing, start rolling temperature is 1200～1240 ℃, and the relative draft of single pass has at least more than two passages and is controlled at 25 ~ 40%.Strict each pass deformation of controlling during finish rolling, finish rolling start rolling temperature≤950 ℃ have the twice draft at least〉more than 20%, extreme trace time draft〉10%.Roll rear steel plate adopt control cooling, speed of cooling≤5 ℃/s, final cooling temperature≤600 ℃.
5, modified thermal treatment
Rule of thumb formula and actual in conjunction with situ production, determine that quenching temperature is 880 ℃ ~ 920 ℃, time inside furnace: t * 1.4min/mm+10min.600 ℃ ~ 630 ℃ of tempering temperatures, soaking time t * 2.4 ~ 3.2min/mm+20min, wherein t is steel plate thickness, unit is mm.
Beneficial effect of the present invention is:
By rational chemical composition design, obtain a kind of tensile strength greater than 600MPa, have good plasticity, good low-temperature impact toughness and the pressure steel pipe of hydropower station steel plate of welding property.
Description of drawings
Fig. 1 is the metallographic structure figure of the embodiment of the present invention 3 steel plates.
Embodiment
Below for a more detailed description to the present invention with embodiment.These embodiment are only the descriptions to best mode for carrying out the invention, scope of the present invention are not had any restriction.
Embodiment 1
Converter smelting adopts the process pretreated molten iron of desulfurization and steel scrap as raw material.Adopt single slag technique to smelt, high carbon ferromanganese and silumin deoxidation alloying, the tapping pushing off the slag guarantees a catch carbon success, Tapping Temperature of Bof is controlled at 1620 ~ 1640 ℃.The RH operation adopts the dark degasification technique of circulation, guaranteeing significantly to reduce the gas contents such as hydrogen, oxygen, nitrogen under the stable prerequisite of liquid steel temperature, reduce obnoxious flavour to the disadvantageous effect of steel, the chemical component weight per-cent of the molten steel that finally obtains is the 250mm heavy slab of chemical component weight per-cent shown in table 1.
1240 ℃ of slab heating temperatures, total time inside furnace 385min, 1220 ℃ of fs start rolling temperatures, the relative draft of single pass has at least more than two passages and is controlled at 25 ~ 40%, when rolled piece thickness is 38mm, treat that on roller-way temperature to 1020 ℃, carries out subordinate phase rolling subsequently, finishing temperature is not controlled, and finished steel plate thickness is 12mm.After rolling end, the steel plate air cooling enters heat rectification machine, and after heat is rectified, cold bed is cooling.Send into quenching furnance after steel plate impeller blasting and process, 880 ℃ of quenching temperatures, time inside furnace: t * 1.4min/mm+10min.610 ℃ of tempering temperatures, soaking time t * 2.4min/mm+20min, wherein t is steel plate thickness, unit is mm.Can obtain described steel plate at last.
Embodiment 2
Embodiment is with embodiment 1, and wherein Heating temperature is 1232 ℃, total time inside furnace 383min, fs, rolling start rolling temperature was 1214 ℃, and the rolling start rolling temperature of subordinate phase is 892 ℃, and intermediate blank treats that temperature thickness is 96mm, finishing temperature is 831 ℃, and finished steel plate thickness is 38mm.After rolling end, steel plate enters and accelerates cooling (ACC) device, 3 ℃/s of speed of cooling, and 589 ℃ of final cooling temperatures, after heat is rectified, cold bed is cooling.Send into quenching furnance after steel plate impeller blasting and process, 920 ℃ of quenching temperatures, time inside furnace: t * 1.4min/mm+10min.610 ℃ of tempering temperatures, soaking time t * 3.2min/mm+20min, wherein t is steel plate thickness, unit is mm.Can obtain described steel plate at last.
Embodiment 3
Embodiment is with embodiment 1, and wherein Heating temperature is 1233 ℃, total time inside furnace 383min, fs, rolling start rolling temperature was 1214 ℃, and the rolling start rolling temperature of subordinate phase is 892 ℃, and intermediate blank treats that temperature thickness is 100mm, finishing temperature is 821 ℃, and finished steel plate thickness is 50mm.After rolling end, steel plate enters and accelerates cooling (ACC) device, 2 ℃/s of speed of cooling, and 558 ℃ of final cooling temperatures, after heat is rectified, cold bed is cooling.Send into quenching furnance after steel plate impeller blasting and process, 920 ℃ of quenching temperatures, time inside furnace: t * 1.4min/mm+10min.610 ℃ of tempering temperatures, soaking time t * 2.4min/mm+20min, wherein t is steel plate thickness, unit is mm.Can obtain described steel plate at last.
The chemical composition of table 1 embodiment of the present invention 1～3 (wt%)
| Embodiment | C | Si | Mn | P | S | Nb | V | Ti | Ni | Cr | Mo |
| 1 | 0.07 | 0.24 | 1.45 | 0.009 | 0.003 | 0.038 | 0.038 | 0.015 | 0.23 | 0.17 | 0.17 |
| 2 | 0.08 | 0.25 | 1.45 | 0.008 | 0.002 | 0.035 | 0.040 | 0.014 | 0.25 | 0.18 | 0.17 |
| 3 | 0.08 | 0.25 | 1.46 | 0.008 | 0.003 | 0.034 | 0.040 | 0.013 | 0.25 | 0.18 | 0.17 |
Steel plate to the embodiment of the present invention 1～3 carries out tensile property ,-20 ℃ of transverse impact service checks, and cold-bending property is all qualified.The results are shown in Table 2 and table 3.
The mechanical property of the steel plate of table 2 embodiment of the present invention 1～3
Table 3 embodiment of the present invention 2-3 steel plate Z-direction tensile property
Claims (2)
1. 600MPa level hydraulic power pressure steel for steel pipes plate, it is characterized in that: the chemical composition of steel plate is C:0.06～0.09%, Si:0.20～0.40%, Mn:1.4～1.6%, P by weight percentage :≤0.015%, S :≤0.005%, Nb:0.02～0.04%, Ni:0.20～0.40%, Cr:0.10～0.30%, Mo:0.10～0.30%, V:0.03～0.05%, Ti:0.01～0.02%, surplus are Fe and inevitable impurity.
2. the manufacture method of a 600MPa level hydraulic power pressure steel for steel pipes plate according to claim 1, it is characterized in that: adopt the process pretreated molten iron of desulfurization and steel scrap as raw material, through converter smelting, the LF refining, the RH vacuum-treat, obtaining chemical component weight per-cent is C:0.06～0.09%, Si:0.20～0.40%, Mn:1.4～1.6%, P :≤0.015%, S :≤0.005%, Nb:0.02～0.04%, Ni:0.20～0.40%, Cr:0.10～0.30%, Mo:0.10～0.30%, V:0.03～0.05%, Ti:0.01～0.02%, surplus is the molten steel of Fe and inevitable impurity, cast plate slab on continuous caster, to the plate slab heating, heating and temperature control is at 1210 ℃ ~ 1250 ℃ in process furnace, and total time inside furnace is greater than 270min, then be rolled, strengthen the roughing pass deformation when rolling, start rolling temperature is 1200～1240 ℃, the relative draft of single pass has at least more than two passages and is controlled at 25 ~ 40%, and finish rolling start rolling temperature≤950 ℃ have two passage drafts at least〉more than 20%, extreme trace time draft〉10%, roll rear steel plate adopt control cooling, final cooling temperature≤600 ℃, speed of cooling≤5 ℃/s, carry out at last modifier treatment, wherein quenching temperature is 880 ℃ ~ 920 ℃, time inside furnace: t * 1.4min/mm+10min.600 ℃ ~ 630 ℃ of tempering temperatures, soaking time t * 2.4 ~ 3.2min/mm+20min, wherein t is steel plate thickness, unit is mm.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104962837A (en) * | 2015-06-15 | 2015-10-07 | 武汉钢铁(集团)公司 | Steel plate for 600 MPa grade hydropower pressure steel tube with low crack sensitivity and production method of steel plate |
| CN106591713A (en) * | 2016-11-02 | 2017-04-26 | 内蒙古包钢钢联股份有限公司 | High-strength container steel plate and preparation method thereof |
| CN107177802A (en) * | 2017-04-24 | 2017-09-19 | 舞阳钢铁有限责任公司 | Large-scale storage tank quenching and tempering, high 12MnNiVR steel plates and production method |
| CN114134407A (en) * | 2021-06-04 | 2022-03-04 | 江阴兴澄特种钢铁有限公司 | Easy-to-weld steel plate with excellent low-temperature toughness at core for volute and manufacturing method thereof |
| CN115558848A (en) * | 2022-09-22 | 2023-01-03 | 舞阳钢铁有限责任公司 | Ultralow temperature container steel plate and production method thereof |
| CN116555670A (en) * | 2023-06-02 | 2023-08-08 | 钢铁研究总院有限公司 | Anti-fatigue steel for marine riser and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1932064A (en) * | 2005-09-12 | 2007-03-21 | 鞍钢股份有限公司 | Thick steel plate with great line energy and low welding crack sensitivity and its production process |
| CN102676945A (en) * | 2012-04-25 | 2012-09-19 | 舞阳钢铁有限责任公司 | Easily-weldable tempered high-strength ductile steel plate used in hydroelectric projects and production method thereof |
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2012
- 2012-12-27 CN CN2012105792084A patent/CN103103455A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1932064A (en) * | 2005-09-12 | 2007-03-21 | 鞍钢股份有限公司 | Thick steel plate with great line energy and low welding crack sensitivity and its production process |
| CN102676945A (en) * | 2012-04-25 | 2012-09-19 | 舞阳钢铁有限责任公司 | Easily-weldable tempered high-strength ductile steel plate used in hydroelectric projects and production method thereof |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104962837A (en) * | 2015-06-15 | 2015-10-07 | 武汉钢铁(集团)公司 | Steel plate for 600 MPa grade hydropower pressure steel tube with low crack sensitivity and production method of steel plate |
| CN106591713A (en) * | 2016-11-02 | 2017-04-26 | 内蒙古包钢钢联股份有限公司 | High-strength container steel plate and preparation method thereof |
| CN107177802A (en) * | 2017-04-24 | 2017-09-19 | 舞阳钢铁有限责任公司 | Large-scale storage tank quenching and tempering, high 12MnNiVR steel plates and production method |
| CN114134407A (en) * | 2021-06-04 | 2022-03-04 | 江阴兴澄特种钢铁有限公司 | Easy-to-weld steel plate with excellent low-temperature toughness at core for volute and manufacturing method thereof |
| CN115558848A (en) * | 2022-09-22 | 2023-01-03 | 舞阳钢铁有限责任公司 | Ultralow temperature container steel plate and production method thereof |
| CN115558848B (en) * | 2022-09-22 | 2023-11-21 | 舞阳钢铁有限责任公司 | Ultralow-temperature container steel plate and production method thereof |
| CN116555670A (en) * | 2023-06-02 | 2023-08-08 | 钢铁研究总院有限公司 | Anti-fatigue steel for marine riser and preparation method thereof |
| CN116555670B (en) * | 2023-06-02 | 2024-03-05 | 钢铁研究总院有限公司 | Anti-fatigue steel for marine riser and preparation method thereof |
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Application publication date: 20130515 |