CN110184528A - With the Q345R steel plate and its manufacturing method of excellent properties under the conditions of a kind of High Temperature Simulation post weld heat treatment - Google Patents

With the Q345R steel plate and its manufacturing method of excellent properties under the conditions of a kind of High Temperature Simulation post weld heat treatment Download PDF

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Publication number
CN110184528A
CN110184528A CN201810592142.XA CN201810592142A CN110184528A CN 110184528 A CN110184528 A CN 110184528A CN 201810592142 A CN201810592142 A CN 201810592142A CN 110184528 A CN110184528 A CN 110184528A
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steel plate
heat treatment
high temperature
steel
weld heat
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CN110184528B (en
Inventor
刘海宽
钱刚
李经涛
苗丕峰
高助忠
张建
徐伟
恽鹏程
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Jiangyin Xingcheng Special Steel Works Co Ltd
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Jiangyin Xingcheng Special Steel Works Co Ltd
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    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0205Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0221Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
    • C21D8/0226Hot rolling
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0247Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C33/00Making ferrous alloys
    • C22C33/04Making ferrous alloys by melting
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/02Ferrous alloys, e.g. steel alloys containing silicon
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/04Ferrous alloys, e.g. steel alloys containing manganese
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/06Ferrous alloys, e.g. steel alloys containing aluminium
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/08Ferrous alloys, e.g. steel alloys containing nickel
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/12Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/14Ferrous alloys, e.g. steel alloys containing titanium or zirconium
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/16Ferrous alloys, e.g. steel alloys containing copper

Abstract

The present invention relates to, with the Q345R steel plate of excellent properties, chemical component is C:0.16~0.20%, Si:0.25~0.45% under the conditions of a kind of High Temperature Simulation post weld heat treatment, Mn:1.40~1.60%, P :≤0.008%, S :≤0.002%, Al:0.02~0.05%, Nb:0.02~0.05%, Ti:0.01~0.05%, Ni:0.10~0.30%, Cu:0.10~0.30%, surplus is Fe and inevitable impurity element, carbon equivalent Ceq≤0.45%.It is designed using big compression ratio, master operation includes smelting, two-phase control rolling and normalizing heat treatment.Steel plate is normalizing delivery state, deliver goods state surface Brinell hardness≤170HB, -30 DEG C of side knock function >=100J at steel plate thickness 1/2 after High Temperature Simulation post weld heat treatment, yield strength >=325Mpa, tensile strength >=500Mpa, elongation after fracture A >=25.0%, steel plate inspection can meet I grades of qualifications of NB/T47013.3 standard.

Description

With the Q345R steel plate of excellent properties under the conditions of a kind of High Temperature Simulation post weld heat treatment And its manufacturing method
Technical field
The invention belongs to steel plate manufacturing fields, and in particular to one kind is with a thickness of 20-100mm, at High Temperature Simulation postwelding heat With the Q345R steel plates for boiler and pressure vessels and its manufacturing method of excellent properties under the conditions of reason.
Background technique
Q345R is the boiler and steel plate of pressure vessel that China's dosage is maximum, purposes is most wide, with economic construction and petrochemical industry row The manufacturing fast development of industry, it is increasing to the demand of Q345R steel plate in the market, while designing and postwelding is simulated to steel plate The requirement of heat treatment performance is also higher and higher, and Simulated post-weld heat treatment holding temperature is improved from 580-635 DEG C to 650 DEG C.In recent years Come, uses Q345R due to designing above same turret vessel equipment simultaneously and face two kinds of materials of hydrogen chrome-molybdenum steel, needed after the completion of device fabrication It is whole to carry out the processing of postwelding stress-removal, therefore it is required that Q345R uses identical Simulated post-weld heat treatment system with hydrogen chrome-molybdenum steel is faced: 690 DEG C or 705 DEG C of Simulated post-weld heat treatment holding temperature, soaking time is 12 hours, while after requiring Simulated post-weld heat treatment Tensile property and impact property meet standard requirements at steel plate thickness 1/2, and deliver goods state surface Brinell hardness≤200HB, produce skill Art is difficult.Plate Production factory, the country guarantees High Temperature Simulation post weld heat treatment steel plate under the conditions of limiting carbon equivalent at present The method of energy is usually to change the condition of delivery, and normalizing delivery is changed to normalizing and accelerates to cool down, or is directlyed adopt at quenching+tempering Reason, or even hot rolled steel plate is directlyed adopt in order to reduce cost, drawback is steel plate nonuniform organization, and hardness is higher, residual stress It is larger, it is unfavorable for following process and manufacture, the pressure vessel and equipment for contacting for corrosive medium or using in extreme circumstances comes It says, there are certain hidden danger of quality and risks for the steel plate produced using the above method.Under the normalizing condition of delivery, guarantee that steel plate is handed over Intensity and impact flexibility meet standard and requirement simultaneously after goods state surface hardness and Simulated post-weld heat treatment, and obtain best Matching is the technological difficulties of such Plate Production.
Publication No. be the patent of invention of CN106591723A be related to " a kind of SA516Gr70 steel plate under the conditions of high die welding and Its production method " provides a kind of using II type controlled rolling+normalizing accelerated cooling process production SA516Gr70 steel plate method, mould Stretching, impact property meet standard requirements at postwelding steel plate thickness 1/2, and delivery state surface Brinell hardness meets user's requirement, real Apply a steel plate maximum gauge be 100mm, more a height of -5 DEG C of impact temperature, the more a height of 189-191HB of surface Brinell hardness, not yet explicitly Physical simulation post weld heat treatment process system.
Publication No. is that the patent of invention of CN103361550A is related to a kind of " Q370R of Simulated post-weld heat treatment function admirable Steel and production method " provides a kind of Q370R steel of 60-100mm thickness using the production of " two-phase control rolling+normalizing " technique Plate and production method have good low-temperature impact toughness, high temperature tensile properties and Z-direction draftability after Simulated post-weld heat treatment Can, but only can be suitably used for lower Simulated post-weld heat treatment temperature, 600 ± 10 DEG C.
Publication No. is that the patent of invention of CN107619999A is related to a kind of " hydrogen sulfide corrosion resistant of long-time die welding heat treatment Sheet metal and production method " provides a kind of 8-20mm thickness using the production of " two-phase control rolling+(quenching+tempering) " technique Steel plate and production method, steel plate can meet yield strength >=345Mpa, tensile strength 510- after Simulated post-weld heat treatment 640Mpa, -30 DEG C of side knock function >=80J, hardness 130-180HB are not directed to High Temperature Simulation post weld heat treatment system, and steel plate It is smaller to produce thickness range.
The steel plate that above-mentioned patent is not directed to can satisfy 690 DEG C or 705 DEG C of High Temperature Simulation post weld heat treatment requirement produces Product, and the drawbacks such as that there are steel plate thickness is smaller, Performance Match is bad, cannot fully meet the needs of petrochemical industry development.
Summary of the invention
Based on the above prior art, present inventor proposes a kind of Q345R steel plate and its manufacturing method, 700 ± 10 Under the conditions of DEG C High Temperature Simulation post weld heat treatment, steel plate still has excellent mechanical property.
Specifically, the technical problem to be solved by the present invention is to provide a kind of High Temperature Simulation postwelding for the above-mentioned prior art With the Q345R steel plate of excellent properties under heat treatment condition, the manufacture of petrochemical industry important feature component can be applied to, have There is good internal soundness, under the conditions of 700 ± 10 DEG C of High Temperature Simulation post weld heat treatment, steel plate still has excellent mechanical property Can, and steel plate delivery state surface Brinell hardness and Simulated post-weld heat treatment state tensile property and impact flexibility matching are good, completely It can satisfy the needs of petrochemical industry development.
The specific technical solution of the present invention are as follows: with excellent properties under the conditions of a kind of High Temperature Simulation post weld heat treatment The chemical composition comprises the following components in percentage by weight of Q345R steel plate, the steel plate is C:0.16~0.20%, Si:0.25~0.45%, Mn: 1.40~1.60%, P :≤0.008%, S :≤0.002%, Al:0.02~0.05%, Nb:0.02~0.05%, Ti:0.01 ~0.05%, Ni:0.10~0.30%, Cu:0.10~0.30%, surplus are Fe and inevitable impurity element, carbon equivalent Ceq≤0.45%, carbon equivalent calculation formula are as follows: Ceq=C+Mn/6+ (Cr+Mo+V)/5+ (Ni+Cu)/15.
Above-mentioned steel plate with a thickness of 20-100mm, steel plate is that normalizing is delivered goods state, steel plate deliver goods state surface Brinell hardness≤ 170HB, after 700 ± 10 DEG C of High Temperature Simulation post weld heat treatment, -30 DEG C of side knock function can meet monodrome at steel plate thickness 1/2 >=100J, yield strength >=325Mpa, tensile strength >=500Mpa, elongation after fracture A >=25.0%, steel plate inspection can meet I grades of NB/T47013.3 standard qualified.
Design of Chemical Composition thinking of the invention is to guarantee that steel plate has enough solderabilities and low-temperature impact toughness base On plinth, solution strengthening and refined crystalline strengthening constituent content are improved as far as possible within the allowable range to guarantee steel plate stretching with higher Performance, at the same it is unknown by armor plate strength after the collocation guarantee High Temperature Simulation post weld heat treatment of the reasonable combination of chemical element and toughness Aobvious decline.Effect of the chemical element in steel is as follows:
C: carbon can significantly improve the intensity of steel plate, but steel plate can be made to impact degraded toughness when too high levels, and carbon content is super When 0.23%, the welding performance of steel degenerates, and is accordingly used in the low-alloy steel of welding, and phosphorus content is usually no more than 0.20%.This Patent carbon content control is 0.16~0.20%.
Mn: manganese has stronger solution strengthening effect, normal temperature strength and hardness can be improved, but too high levels will lead to weldering Power increase is scooped out, improves the intensity of steel in low-alloy steel come reinforced ferrite and pearlite using manganese, content is generally 1%-2%, this patent manganese content are controlled 1.40~1.60%.
Si: it is good reducing agent and deoxidier that silicon, which is in steelmaking process, while having stronger solution strengthening effect, Normal temperature strength and hardness can be improved, but too high levels can reduce impact flexibility and plate surface quality, this patent silicone content control System is 0.25~0.45%.
P: phosphorus is harmful element, increases the cold brittleness of steel, so that plasticity and welding performance is deteriorated, should reduce as far as possible, this patent Phosphorus content controls below 0.008%.
S: sulphur is harmful element, increases the red brittleness of steel, reduces toughness and ductility, Ying Jinliang unfavorable to welding performance It reduces, this patent sulfur content controls below 0.002%.
Cu: copper has certain precipitation enhancement, but too high levels can weaken crystal boundary, and surface of steel plate is caused star check occur Line, this patent copper content control is 0.10~0.30%.
Ni: nickel energy fining ferrite grains significantly improve low-temperature impact toughness in the identical condition of intensity, can also eliminate Cu to the adverse effect of steel, meanwhile, Ni and Cu combination collocation can prevent after Simulated post-weld heat treatment armor plate strength significantly under Drop.Since Ni is scarce resource, addition Ni element will increase production cost in steel, should control use, the control of this patent nickel content 0.10~0.30%.
Nb, Ti: niobium micro-alloy element and C, N element form carbonitride, have and postpone austenite recrystallization, refinement iron element The effect of body crystal grain, can improve armor plate strength and toughness simultaneously, and this patent Nb content is controlled in 0.02~0.05%, Ti content Control is 0.01~0.05%.
AL: aluminium is mainly used to deoxidation and has refinement crystal grain, and this patent AL content is controlled 0.02~0.05%.
Another object of the present invention is to provide the Q345R steel with excellent properties under the conditions of a kind of High Temperature Simulation post weld heat treatment The manufacturing method of plate, specific as follows:
In order to improve steel rolling compression ratio, using 370mm/450mm section continuous casting steel billet as blank, preferably 450mm is thick Steel billet, main production process include smelting procedure, rolling process and heat treatment procedure, and wherein rolling process is rolled using two stages System, heat treatment procedure are handled using normalizing process, and the concrete operations of master operation are as follows:
1) smelting procedure
Raw materials for metallurgy is successively through the pretreatment of KR molten iron, converter smelting, LF refining, RH Fruit storage and sheet billet continuous casting work Sequence takes off Slag treatment after converter smelting, Calcium treatment, RH application of vacuum final vacuum≤65Pa, vacuum is carried out after LF refining Dwell time >=20min, the ladle bottom soft blow argon gas time >=15min, calm molten steel before being poured, the calm time >=25min, really It protects non-metallic inclusion and is sufficiently denaturalized to float and enter in clinker, improve Molten Steel Cleanliness;Continuous casting working procedure is whole using low overheat Argon for protecting pouring, continuous casting process mitigate slab segregation and rarefaction defect using dynamic soft reduction technology.Stacking after slab is offline Slow cooling 48 hours or more, it is ensured that the hydrogen in steel is sufficiently spread.
2) heating process
Use segmentally heating mode: the second bringing-up section temperature of control is 1210~1250 DEG C, soaking section temperature for 1190~ 1250 DEG C, 370mm section continuous casting steel billet total heating time >=8h, the second bringing-up section and soaking zone total heating time >=120min, 450mm section continuous casting steel billet total heating time >=10h, the second bringing-up section and soaking zone total heating time >=200min, it is ensured that casting Base center portion is heated to target temperature, burns even grill thoroughly.
3) rolling process
Steel billet after rolling heating, using two-phase control rolling, the first stage is rough rolling step, using " the big pressure of high temperature " work Skill, at least two passage single pass rolling reductions >=50mm;Second stage is the finish rolling stage, and dry in the air steel thickness >=2.5 times finished steel plate thickness Degree adds up reduction ratio >=50%, and finishing temperature control is quickly cooled down after rolling using ACC at 780~820 DEG C, eventually cold red temperature It is 630~670 DEG C, quick offline stacking slow cooling >=48 hour of steel plate, sufficiently expansion hydrogen.
4) it is heat-treated
Using normalizing process, normalizing temperature is 870-910 DEG C, soaking time: 1.8min/mm, steel plate come out of the stove after in cold bed Upper cooling, in order to guarantee cooling effect, steel plate minimum spacing is 2 meters, and surface of steel plate temperature≤200 DEG C are offline.
Compared with prior art, the present invention has a characteristic that
The present invention relates to, with the Q345R steel plate of excellent properties, can apply under the conditions of a kind of High Temperature Simulation post weld heat treatment In the manufacture of petrochemical industry important feature component, there is good internal soundness, in 700 ± 10 DEG C of High Temperature Simulation postwelding heat Under treatment conditions, steel plate still has excellent mechanical property, and the delivery of steel plate normalizing state, surface Brinell hardness is low and simulates postwelding Heat treatment state intensity and impact flexibility matching are good, can satisfy the needs of petrochemical industry development completely.
To achieve the goals above, the present invention is using the high-quality continuous casting steel billet production of the big thickness of 370mm/450mm, in same item It is preferential to select 450mm section continuous casting steel billet under part, by the design of reasonable ingredient, improve steel rolling compression ratio and Molten Steel Cleanliness And subsequent heat treatment cooling condition is controlled to improve internal quality of steel plate and mechanical property, each process needs strict control raw Production. art process.
Steel plate ingredient design aspect, on the basis of fully considering steel plate welding performance, by improving the solid solution such as C, Mn, Si Intensified element content and refined crystalline strengthening element nb, Ti content improve the intensity of steel plate, usually improve steel plate by adding Ni member Toughness, while Ni+Cu element combinations add, Cu element can also be eliminated to the adverse effect of plate surface quality, protected simultaneously Armor plate strength and toughness are not in sharp fall after card High Temperature Simulation post weld heat treatment.
Before Calcium treatment is arranged RH process by steel making working procedure, and guaranteeing that certain ladle bottom is soft after the broken sky of RH processing Guarantee the enough calm time on the basis of the blowing argon gas time, secondary oxidation of steel can be prevented, become non-metallic inclusion sufficiently Property, floating, effectively improve Molten Steel Cleanliness.
Slab heating uses segmentally heating mode, extends the second bringing-up section and soaking zone total time, it is ensured that slab center portion It grills thoroughly, internal and external temperature is uniform, and the implementation for the big pressure rolling mill practice of rough rolling step high temperature creates favorable conditions.
Rolling process uses two-phase control rolling, and rough rolling step uses and depresses rolling mill practice greatly, reasonable distribution rolling pass, Main purpose is to press rarefaction defect in steel, guarantees internal quality of steel plate;The finish rolling stage passes through control finishing temperature, accumulative pressure The measures such as lower rate and roller repairing refine crystal grain, carry out tissue preparation for normalized treatment.
The heat treatment process of steel plate of the present invention uses normalizing process, and the cooling condition after coming out of the stove is to guarantee plate property to pass Important, steel plate of the present invention is cooling on cold bed after coming out of the stove, and control steel plate minimum spacing is 2 meters, in surface of steel plate temperature≤200 DEG C It is offline, it can be effectively prevent steel plate grain coarsening, the intensity and impact flexibility with higher after guaranteeing steel plate normalized treatment.
Specific embodiment
Present invention is further described in detail with reference to embodiments.
Embodiment 1
The present embodiment steel plate with a thickness of 20mm, chemical composition comprises the following components in percentage by weight are as follows: its chemical component is by weight Percentages are as follows: C:0.165%, Si:0.41%, Mn:1.42%, P:0.006%, S:0.001%, Al:0.032%, Nb: 0.030%, Ti:0.015%, Ni:0.22%, Cu:0.20%%, surplus are Fe and inevitable impurity element, carbon equivalent Ceq:0.435%, carbon equivalent calculation formula are as follows: Ceq=C+Mn/6+ (Cr+Mo+V)/5+ (Ni+Cu)/15.
The manufacturing process of the steel plate is as follows:
Using 370mm section continuous casting steel billet as blank, the concrete operations of master operation are as follows:
1) smelting procedure
Raw materials for metallurgy is successively through the pretreatment of KR molten iron, converter smelting, LF refining, RH Fruit storage and sheet billet continuous casting work Sequence.Slag treatment is taken off after converter smelting, Calcium treatment is carried out after LF refining, and RH application of vacuum final vacuum is 62Pa, vacuum Dwell time is 22min, and the ladle bottom soft blow argon gas time is 18min, and the calm time is 28min before being poured, it is ensured that nonmetallic Field trash is sufficiently denaturalized floating and enters in clinker, improves Molten Steel Cleanliness;Continuous casting working procedure is protected using low overheat whole process argon gas Casting mitigates slab segregation and rarefaction defect by dynamic soft reduction technology.Stacking slow cooling 48 hours or more after slab is offline, really The hydrogen protected in steel is sufficiently spread.
2) heating process
Use segmentally heating mode: the second bringing-up section temperature is 1242 DEG C, and soaking section temperature is 1235 DEG C, and continuous casting steel billet is total Heating time is 8.5h, and the second bringing-up section and soaking zone total heating time are 142min, it is ensured that slab center portion is heated to target temperature Degree burns even grill thoroughly.
3) rolling process
Using two-phase control rolling, the first stage is rough rolling step, and using " the big pressure of high temperature " technique, axial rolling passage has 4 Secondary single pass rolling reduction >=50mm, respectively 55mm, 52mm, 55mm, 56mm;Second stage be the finish rolling stage, dry in the air steel with a thickness of 3.5 times of finished steel plate thickness, adding up reduction ratio is 62%, and finishing temperature is 815 DEG C, rolls rear ACC and is quickly cooled down, cold eventually to return red temperature Degree is 652 DEG C, quick offline stacking slow cooling >=48 hour of steel plate, sufficiently expansion hydrogen.
4) heat treatment procedure
Using normalizing process, normalizing temperature is 890 DEG C, and soaking time coefficient: 1.8min/mm, steel plate are come out of the stove on cold bed Cooling, in order to guarantee cooling effect, steel plate minimum spacing is 2 meters, and surface of steel plate temperature≤200 DEG C are offline.
Via 20mm thickness Q345R steel plate made from above-mentioned manufacturing process, flaw detection can meet I grades of NB/T47013.3 standard conjunctions Lattice all have excellent mechanical property under the condition of delivery and under the conditions of High Temperature Simulation post weld heat treatment, and see Table 1 for details and table 2.
Embodiment 2
The present embodiment steel plate with a thickness of 50mm, chemical composition comprises the following components in percentage by weight are as follows: C:0.16%, Si: 0.42%, Mn:1.42%, P:0.005%, S:0.0008%, Al:0.034%, Nb:0.032%, Ti:0.016%, Ni: 0.25%, Cu:0.21%%, surplus are Fe and inevitable impurity element, and carbon equivalent Ceq:0.44%, carbon equivalent calculates public Formula are as follows: Ceq=C+Mn/6+ (Cr+Mo+V)/5+ (Ni+Cu)/15.
The manufacturing process of the steel plate is as follows:
Using 450mm section continuous casting steel billet as blank, the concrete operations of master operation are as follows:
1) smelting procedure
Raw materials for metallurgy is successively through the pretreatment of KR molten iron, converter smelting, LF refining, RH Fruit storage and sheet billet continuous casting work Sequence.Slag treatment is taken off after converter smelting, Calcium treatment is carried out after LF refining, and RH application of vacuum final vacuum is 60Pa, vacuum Dwell time is 25min, and the ladle bottom soft blow argon gas time is 16min, and the calm time is 30min before being poured, it is ensured that nonmetallic Field trash is sufficiently denaturalized floating and enters in clinker, improves Molten Steel Cleanliness;Continuous casting working procedure is protected using low overheat whole process argon gas Casting mitigates slab segregation and rarefaction defect by dynamic soft reduction technology.Stacking slow cooling 48 hours or more after slab is offline, really The hydrogen protected in steel is sufficiently spread.
2) heating process
Use segmentally heating mode: the second bringing-up section temperature is 1245 DEG C, and soaking section temperature is 1238 DEG C, and continuous casting steel billet is total Heating time is 11h, and the second bringing-up section and soaking zone total heating time are 215min, it is ensured that slab center portion is heated to target temperature Degree burns even grill thoroughly.
3) rolling process
Using two-phase control rolling, the first stage is rough rolling step, and using " the big pressure of high temperature " technique, axial rolling passage has 4 Secondary single pass rolling reduction >=50mm, respectively 52mm, 52mm, 55mm, 55mm;Second stage be the finish rolling stage, dry in the air steel with a thickness of 3.0 times of finished steel plate thickness, adding up reduction ratio is 65%, and finishing temperature is 810 DEG C, rolls rear ACC and is quickly cooled down, cold eventually to return red temperature Degree is 645 DEG C, quick offline stacking slow cooling >=48 hour of steel plate, sufficiently expansion hydrogen.
4) heat treatment procedure
Using normalizing process, normalizing temperature is 890 DEG C, and soaking time coefficient: 1.8min/mm, steel plate are come out of the stove on cold bed Cooling, in order to guarantee cooling effect, steel plate minimum spacing is 2 meters, and surface of steel plate temperature≤200 DEG C are offline.
Via 50mm thickness Q345R steel plate made from above-mentioned manufacturing process, flaw detection can meet I grades of NB/T47013.3 standard conjunctions Lattice all have excellent mechanical property under the condition of delivery and under the conditions of High Temperature Simulation post weld heat treatment, and see Table 1 for details and table 2.
Embodiment 3
The present embodiment steel plate with a thickness of 100mm, chemical composition comprises the following components in percentage by weight are as follows: C:0.17%, Si: 0.45%, Mn:1.45%, P:0.005%, S:0.0005%, Al:0.035%, Nb:0.035%, Ti:0.014%, Ni: 0.23%, Cu:0.22%, surplus are Fe and inevitable impurity element, and carbon equivalent Ceq:0.445%, carbon equivalent calculates public Formula are as follows: Ceq=C+Mn/6+ (Cr+Mo+V)/5+ (Ni+Cu)/15.
The manufacturing process of the steel plate is as follows:
Using 450mm section continuous casting steel billet as blank, the concrete operations of master operation are as follows:
1) smelting procedure
Raw materials for metallurgy is successively through the pretreatment of KR molten iron, converter smelting, LF refining, RH Fruit storage and sheet billet continuous casting work Sequence.Slag treatment is taken off after converter smelting, Calcium treatment is carried out after LF refining, and RH application of vacuum final vacuum is 60Pa, vacuum Dwell time is 25min, and the ladle bottom soft blow argon gas time is 20min, and the calm time is 30min before being poured, it is ensured that nonmetallic Field trash is sufficiently denaturalized floating and enters in clinker, improves Molten Steel Cleanliness;Continuous casting working procedure is protected using low overheat whole process argon gas Casting mitigates slab segregation and rarefaction defect by dynamic soft reduction technology.Stacking slow cooling 48 hours or more after slab is offline, really The hydrogen protected in steel is sufficiently spread.
2) heating process
Use segmentally heating mode: the second bringing-up section temperature is 1241 DEG C, and soaking section temperature is 1238 DEG C, and continuous casting steel billet is total Heating time is 11.5h, and the second bringing-up section and soaking zone total heating time are 225min, it is ensured that slab center portion is heated to target temperature Degree burns even grill thoroughly.
3) rolling process
Using two-phase control rolling, the first stage is rough rolling step, and using " the big pressure of high temperature " technique, axial rolling passage has 2 Secondary single pass rolling reduction >=50mm, respectively 55mm, 55mm;Second stage is the finish rolling stage, and the steel that dries in the air is with a thickness of 2.5 times of finished steels Plate thickness, adding up reduction ratio is 48%, and finishing temperature is 808 DEG C, rolls rear ACC and is quickly cooled down, and cold red temperature is 642 DEG C eventually, Quick offline stacking slow cooling >=48 hour of steel plate, sufficiently expansion hydrogen.
4) heat treatment procedure
Using normalizing process, normalizing temperature is 905 DEG C, and soaking time coefficient: 1.8min/mm, steel plate are come out of the stove on cold bed Cooling, in order to guarantee cooling effect, steel plate minimum spacing is 2 meters, and surface of steel plate temperature≤200 DEG C are offline.
Via 100mm thickness Q345R steel plate made from above-mentioned manufacturing process, flaw detection can meet I grades of NB/T47013.3 standard conjunctions Lattice all have excellent mechanical property under the condition of delivery and under the conditions of High Temperature Simulation post weld heat treatment, and see Table 1 for details and table 2.
The mechanical property of 1 each embodiment steel plate produced of table
Note: being average value in (), sample blanks Simulated post-weld heat treatment system: 700 DEG C × 12h ,≤400 DEG C of disengaging furnace temperatures, Warming and cooling rate≤50 DEG C/h.
The surface Brinell hardness of 2 each embodiment steel plate produced of table
Note: being average value in (), sample blanks Simulated post-weld heat treatment system: 700 DEG C × 12h ,≤400 DEG C of disengaging furnace temperatures, Warming and cooling rate≤50 DEG C/h.
In addition to the implementation, all to use equivalent transformation or equivalent replacement the invention also includes there is an other embodiments The technical solution that mode is formed should all be fallen within the scope of the hereto appended claims.

Claims (7)

1. with the Q345R steel plate of excellent properties under the conditions of a kind of High Temperature Simulation post weld heat treatment, it is characterised in that: the steel plate Chemical composition comprises the following components in percentage by weight is C:0.16~0.20%, Si:0.25~0.45%, Mn:1.40~1.60%, P :≤ 0.008%, S :≤0.002%, Al:0.02~0.05%, Nb:0.02~0.05%, Ti:0.01~0.05%, Ni:0.10~ 0.30%, Cu:0.10~0.30%, surplus are Fe and inevitable impurity element, carbon equivalent Ceq≤0.45%, carbon equivalent Calculation formula are as follows: Ceq=C+Mn/6+ (Cr+Mo+V)/5+ (Ni+Cu)/15.
2. special with the Q345R steel plate of excellent properties under the conditions of High Temperature Simulation post weld heat treatment according to claim 1 Sign is: the steel plate with a thickness of 20-100mm, steel plate is that normalizing is delivered goods state, steel plate deliver goods state surface Brinell hardness≤ 170HB, after High Temperature Simulation post weld heat treatment, -30 DEG C of side knock function can meet monodrome >=100J at steel plate thickness 1/2, surrender Intensity >=325Mpa, tensile strength >=500Mpa, elongation after fracture A >=25.0%, steel plate inspection can meet NB/T47013.3 mark Quasi- I grades qualified.
3. special with the Q345R steel plate of excellent properties under the conditions of High Temperature Simulation post weld heat treatment according to claim 2 Sign is: the temperature that the High Temperature Simulation post weld heat treatment is related to is 700 ± 10 DEG C.
4. a kind of manufacturing method of the Q345R steel plate under the conditions of High Temperature Simulation post weld heat treatment with excellent properties, feature exist In:
Using 370mm/450mm section continuous casting steel billet as blank, main production process includes smelting procedure, rolling process and heat Treatment process, wherein rolling process uses two-phase control rolling, and heat treatment procedure is handled using normalizing process.
5. the system of the Q345R steel plate under the conditions of High Temperature Simulation post weld heat treatment according to claim 4 with excellent properties Make method, it is characterised in that: the concrete operations of master operation are as follows:
1) smelting procedure
Raw materials for metallurgy successively through the pretreatment of KR molten iron, converter smelting, LF refining, RH Fruit storage and sheet billet continuous casting process, Slag treatment is taken off after converter smelting, and Calcium treatment, RH application of vacuum final vacuum≤65Pa, vacuum pressure maintaining are carried out after LF refining Time >=20min, ladle bottom soft blow argon gas time >=15min, calm molten steel, calm time >=25min, it is ensured that non-before being poured Metallic inclusion is sufficiently denaturalized floating and enters in clinker, improves Molten Steel Cleanliness;Continuous casting working procedure uses low overheat whole process argon gas Molding casting, stacking slow cooling 48 hours or more after slab is offline, it is ensured that the hydrogen in steel is sufficiently spread;
2) heating process
Use segmentally heating mode: for the second bringing-up section temperature of control for 1210~1250 DEG C, soaking section temperature is 1190~1250 DEG C, 370mm section continuous casting steel billet total heating time >=8h, the second bringing-up section and soaking zone total heating time >=120min, 450mm Section continuous casting steel billet total heating time >=10h, the second bringing-up section and soaking zone total heating time >=200min, it is ensured that slab center portion It is heated to target temperature, burns even grill thoroughly;
3) rolling process
Steel billet after rolling heating, using two-phase control rolling, the first stage is rough rolling step, using " the big pressure of high temperature " technique, At least two passage single pass rolling reductions >=50mm;Second stage is the finish rolling stage, and dry in the air steel thickness >=2.5 times finished steel plate thickness, Accumulative reduction ratio >=50%, finishing temperature control are quickly cooled down after rolling using ACC at 780~820 DEG C, and cold red temperature is eventually 630~670 DEG C, quick offline stacking slow cooling >=48 hour of steel plate, sufficiently expansion hydrogen;
4) it is heat-treated
Using normalizing process, normalizing temperature is 870-910 DEG C, and soaking time: 1.8min/mm, steel plate are cold on cold bed after coming out of the stove But, in order to guarantee cooling effect, steel plate minimum spacing is 2 meters, and surface of steel plate temperature≤200 DEG C are offline.
6. the system of the Q345R steel plate under the conditions of High Temperature Simulation post weld heat treatment according to claim 5 with excellent properties Make method, it is characterised in that: continuous casting process mitigates slab segregation and rarefaction defect using dynamic soft reduction technology in step (1).
7. the system of the Q345R steel plate under the conditions of High Temperature Simulation post weld heat treatment according to claim 5 with excellent properties Make method, it is characterised in that: step (1) smelt gained molten steel chemical composition comprises the following components in percentage by weight be C:0.16~ 0.20%, Si:0.25~0.45%, Mn:1.40~1.60%, P :≤0.008%, S :≤0.002%, Al:0.02~ 0.05%, Nb:0.02~0.05%, Ti:0.01~0.05%, Ni:0.10~0.30%, Cu:0.10~0.30%, surplus are Fe and inevitable impurity element.
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