CN106498289A - A kind of big thickness S550Q steel plates of 550MPa levels and production method - Google Patents
A kind of big thickness S550Q steel plates of 550MPa levels and production method Download PDFInfo
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Abstract
The invention discloses a kind of 550MPa levels big thickness water power low-carbon bainite S550Q steel plates and its production method, the steel plate chemical composition and weight/mass percentage composition are as follows：C：0.14～0.17%, Si：0.20～0.40%, Mn：1.00～1.20%, Ni：1.00～1.20%, P≤0.010%, S≤0.005%, Nb：0.020～0.040%, V：0.035～0.050%, Cr：0.30～0.50%, Mo：0.40～0.50%, Al when steel ingot is become a useful person：0.020～0.040% or ESR ingot Al when becoming a useful person：0.060～0.080%, balance of Fe and inevitable impurity.The production method of the big thickness S550Q steel plates of 550MPa levels, including heating, rolling and heat treatment step.Had at higher degree of purity, good mechanical properties, thickness of slab 1/4 using the steel plate produced by the inventive method and at thickness of slab 1/2,20 DEG C of ballistic works and the Z-direction contraction percentage of area are higher, the characteristics of there is well single bainite structure, combination property and excellent welding performance.
Description
Technical field
The present invention relates to a kind of low-carbon bainite steel plate and its production method, the especially a kind of big thickness of 550MPa levels
S550Q steel plates and production method.
Background technology
In recent years, with the fast development of construction of hydropower facilities, for the demand of big thickness steel plate becomes increasingly conspicuous, market is for thickness
The demand of specification steel for low-temperature pressure container is increasing.For a long time due to lacking necessary production equipment and technical support,
Simultaneously because domestic big thickness, big substance, higher intensity rank steel mechanical property such as subzero temperature impact flexibility is not good, and produce
Relatively costly, cause the demand that can not meet domestic market.Big thickness water-power steel plate tends to rely on forging, seriously constrains
The development of China's construction of hydropower stations.
Content of the invention
The technical problem to be solved in the present invention is to provide that a kind of performance is good, a kind of low cost big thickness water power low-carbon (LC) shellfish
Family name's body S550Q steel plates；Present invention also offers a kind of production method of big thickness water power with low-carbon bainite S550Q steel plates.
For solving above-mentioned technical problem, the technical solution used in the present invention is：The steel plate chemical composition and quality hundred
Divide content as follows：C：0.14～0.17%, Si：0.20～0.40%, Mn：1.00～1.20%, Ni：1.00～1.20%, P≤
0.010%, S≤0.005%, Nb：0.020～0.040%, V：0.035～0.050%, Cr：0.30～0.50%, Mo：0.40～
0.50%, Al when steel ingot is become a useful person：0.020～0.040% or ESR ingot Al when becoming a useful person：0.060～0.080%, balance of Fe and can not
The impurity for avoiding.
The maximum gauge of steel plate of the present invention is 260 millimeters.
The mechanism of action of each component of the present invention and content is：
C：Carbon is made a significant impact on the surrender of steel, tensile strength, welding performance.Carbon can significantly improve steel plate by gap solid solution
Intensity, but carbon content is too high, can affect the welding performance and toughness of steel again.
Si：As reducing agent and deoxidizer in steelmaking process, while Si can also play solution strengthening effect, but exceed
When 0.5%, the toughness of steel can be caused to decline, reduce the welding performance of steel.
Mn：Manganese is with low cost, can increase toughness, intensity and the hardness of steel, improves the quenching degree of steel, improves the hot-working of steel
Performance；Manganese amount is too high, can weaken the resistance to corrosion of steel, reduces welding performance.
Ni：The drag overall that dislocation when nickel can reduce low temperature is moved in parent metal, Ni can also improve stacking fault energy, suppression
The formation of system a large amount of dislocations in low temperature, helical dislocation commutative Banach aglebra during promotion low temperature make cracks can spread consume work(increase event toughness and carry
Height, so that reduce the ductile-brittle transition temperature of steel.But nickel is precious metal, too high nickel will increase cost.
P、S：In general, p and ses are all harmful elements in steel, increase the fragility of steel.Phosphorus becomes welding performance
Bad, reduce plasticity, make cold-bending property degenerate；Sulfur reduces the ductility and toughness of steel, causes crackle in forging and rolling；Therefore
P and ses content in steel is reduced as far as possible should.
Al：Aluminum is the deoxidizer that commonly uses in steel.Add a small amount of aluminum in steel, can crystal grain thinning, improve impact flexibility.Aluminum is also
There is non-oxidizability and corrosion resistance, the too high hot-working character for then affecting steel, welding performance and machinability.
Nb：The crystal grain refinement for being added to promote steel rolling microscopic structure of niobium, can improve intensity and toughness, niobium simultaneously
In During Controlled Rolling by suppressing the effective refinement microstructure of austenite recrystallization, and precipitation strength matrix can be passed through.Niobium can
Reduce superheated susceptivity and the temper brittleness of steel.In welding process, the Ovshinsky when segregation of niobium atom and precipitation can hinder to heat
The roughening of body crystal grain, and after ensureing to weld, obtain relatively fine heat affected area tissue, improving welding property.Simultaneously by twice
Crystal grain thinning is preferably played a part of in quenching, provides guarantor for obtaining higher intensity rank and stablizing excellent impact flexibility
Card.
V：Vanadium can significantly improve the welding performance of common low carbon low-alloy steel, and vanadium is the excellent deoxidizer of steel.Vanadium is in steel
In main in the form of carbide, its Main Function is the tissue and crystal grain for refining steel, adds 0.35%-0.50% left in steel
Right vanadium can thinning microstructure crystal grain, raising intensity and toughness.The carbide that vanadium can also be formed with carbon, can be improved at high temperature under high pressure
Hydrogen attack resistance.Vanadium and carbon, ammonia, oxygen have extremely strong affinity, form corresponding stable compound therewith.Vanadium increase simultaneously is quenched
Fiery steel belt roof bolt stability, and produce post-curing effect.The crystal grain for being added to promotion steel rolling microscopic structure of V is thin
Change, intensity and toughness can be improved simultaneously, while preferably play a part of crystal grain thinning by quenching twice, while improve back
Fiery stability, provides guarantee for obtaining higher intensity rank and stablizing excellent impact flexibility.
Cr：In the range of low-alloy steel, there is very big invigoration effect to steel, improve intensity, hardness and wearability, reduce
The critical cooling rate of steel, improves the quenching degree of steel.
Mo：There is stronger carbide Forming ability, the coarse grains of austenitizing can be prevented, while can also cause C
Curve is moved to right, and is reduced degree of supercooling and is drastically increased quenching degree.
Another object of the present invention is to providing a kind of production method of the big thickness S550Q steel plates of 550MPa levels, the life
Product method includes heating, rolls and heat treatment step；The steel plate chemical composition and weight/mass percentage composition are as follows：C：0.14～
0.17%, Si：0.20～0.40%, Mn：1.00～1.20%, Ni：1.00～1.20%, P≤0.010%, S≤0.005%, Nb：
0.020～0.040%, V：0.035～0.050%, Cr：0.30～0.50%, Mo：0.40～0.50%, Al when steel ingot is become a useful person：
0.020～0.040%, Al when ESR ingot is become a useful person：0.060～0.080%, balance of Fe and inevitable impurity.
Rolling process of the present invention：Using two-stage rolling mill practice；The rolling temperature of first stage be 1080 DEG C～
1130 DEG C, it is 40～55% to add up reduction ratio；The rolling temperature of second stage be 870～910 DEG C, add up reduction ratio be 20～
35%, finishing temperature is 800～850 DEG C, rolls rear ACC water-cooleds.
The start rolling temperature of first stage of the present invention is 1080～1130 DEG C, and finishing temperature is 920～950 DEG C；Described
The start rolling temperature of second stage is 870～910 DEG C, and finishing temperature is 800～850 DEG C, rolls rear ACC water-cooleds.
The single pass reduction ratio of first stage of the present invention and second stage is 10～35%.
Heat treatment step of the present invention：Using secondary quenching+tempering process；In first time quenching process, hardening heat
For 910～920 DEG C, 2.5～2.8min/mm of heat insulating coefficient, using water 2h is directly entered during tapping, water-cooled accelerates cooling, second
In quenching process, hardening heat is 840～850 DEG C, 2.5～2.8min/mm of heat insulating coefficient, using directly entering water 2h during tapping,
Water-cooled accelerates cooling；In drawing process, temperature is 620～640 DEG C, 3.5～4.5min/mm of temperature retention time.
Production method of the present invention pattern of becoming a useful person is become a useful person for steel ingot, and heating process maximum heating temperature is 1230 DEG C,
Less than 1000 DEG C programming rates are 100～120 DEG C/h, and soaking temperature is 1220～1230 DEG C, total 15-20h heat time heating time.
Production method of the present invention pattern of becoming a useful person is become a useful person for continuous casting+electroslag remelting, heating process maximum heating temperature
1240 DEG C, below 1000 DEG C programming rate be 100～120 DEG C/h, 1220～1230 DEG C of soaking temperature, total 15- heat time heating time
20h.
The Design of Chemical Composition of the inventive method adopt C, Mn, Cr, Mo solution strengthening, by adjusting and optimizing steel plate other
The proportioning of element, can guarantee under the conditions of compared with low-carbon-equivalent that mechanical property of steel plate is good, make steel plate that there is good tissue, synthesis
Performance and welding performance, moreover it is possible to reduce the cost.The inventive method mainly using appropriate two-stage rolling mill practice, solves milling train and rolls
Pressing pressure is not enough and causes coarse grains are uneven, have excellent combination property, while making steel using special Technology for Heating Processing
The single low-carbon bainite that is organized as of plate is organized, and can better meet the requirement of higher intensity rank water power steel, thickness of slab 1/4
At place and thickness of slab 1/2, -20 DEG C of impact flexibility are excellent；In addition steel plate elongation percentage has sizable surplus, can be widely used for water power
Engineering, has a extensive future.Technology for Heating Processing of the inventive method using secondary quenching+tempering, using direct after primary quenching
Enter the crystal grain of water cooling refinement rolling state, secondary quenching temperature is intentionally controlled near AC3, to obtain single low-carbon (LC) shellfish
Family name's body is organized, and in the case where impact flexibility does not reduce, can better meet the requirement of higher intensity rank water power steel.
It is using the beneficial effect produced by above-mentioned technical proposal：1st, the steel plate of present invention production is purer, maximum thick
Degree can reach 260mm, good mechanical properties, -20 DEG C of horizontal V-shape ballistic work >=150J, impact flexibility at thickness of slab 1/4 and at 1/2
Excellent；Thickness（Z-direction）Tensile fracture shrinkage factor is between 50～70%；There is good tissue, combination property and welding performance；
2nd, steel plate composition Cr, Mo, Ni element based on carbon, manganese plus a small amount of, cost are relatively low；3rd, adopt in production method of the invention
C, Mn, Cr, Mo, Ni solution strengthening；A small amount of Nb, V is added with crystal grain thinning, its carbonitride play dispersion-strengthened action while
Strengthen the temper resistance of steel plate；Add a small amount of Ni to improve low-temperature flexibility.Had using the steel plate produced by the inventive method
Have higher degree of purity, good mechanical properties, -20 DEG C of ballistic works and the Z-direction contraction percentage of area higher, have well single bainite
The characteristics of tissue, combination property and excellent welding performance.
Specific embodiment
With reference to specific embodiment, the present invention is further detailed explanation.
The big thickness water power of this 550MPa levels adopts following techniques with the production method of low-carbon bainite S550Q steel plates：
（1）Smelting procedure：First smelt through first furnace, be re-fed into LF refining furnace refine, and feed the oxygen that Al lines are removed in molten steel, steel
Coolant-temperature gage reaches 1560 ± 10 DEG C and proceeds to VD stove Fruit storages, vacuum≤66.6Pa, vacuum retention time >=20 minute,
Add Ca-Si blocks to discharge the non-metallic inclusion in molten steel, harmful element before vacuum, it is ensured that molten steel pure.
（2）Casting process：Molten steel after by smelting is molded or continuous casting, according to different steel plate thickness from from different
Ingot mould, during molding, the gentle teeming speed of control casting, carries out electromagnetic agitation or slighter compress during continuous casting, and it is cold by force to strengthen solidification end, obtains
Arrive continuous casting billet；In the case of meeting steel plate finished size, consutrodes are done according to different steel plate thickness from continuous casting billet；Casting temperature
Preferably 1530～1545 DEG C of degree, degree of superheat 20-35 DEG C.
（3）Electroslag remelting operation：Carry out electroslag remelting using consutrodes, five yuan of slag systems, crystallizer section be 640mm,
700mm, 760mm and 960mm, averagely molten speed add 22～26g/t/min of aluminum shot in 20～25kg/min, while using air-cooled
Accelerate cooling.
（4）Heating process：Using two kinds of different patterns of becoming a useful person：A kind of technology pattern is that steel ingot is become a useful person, a kind of technique mould
Formula is that continuous casting+electroslag remelting is become a useful person, and when being produced using steel ingot, maximum heating temperature is 1230 DEG C, and heat up below 1000 DEG C speed
Spend for 100～120 DEG C/h, soaking temperature is 1220 DEG C～1230 DEG C；When being produced using ESR ingot, heat up below 1000 DEG C speed
Spend for 100～120 DEG C/h, 1240 DEG C of maximum heating temperature, 1220～1230 DEG C of soaking temperature, total 15-20h heat time heating time.
（5）Rolling process：Using two-stage rolling mill practice；First stage rolling temperature is 1080～1130 DEG C, this stage
Single pass rolling reduction is 10～35%, and it is 40～55% to add up reduction ratio, makes austenite that perfect recrystallization to occur, to refine Ovshinsky
Body crystal grain；Start rolling temperature is 1080～1130 DEG C, and finishing temperature is 920～950 DEG C.
Second stage rolling temperature is 880～920 DEG C, and it is 20～30% to add up reduction ratio, 800～860 DEG C of finishing temperature,
Roll rear ACC water-cooleds；Start rolling temperature is 870～910 DEG C, and finishing temperature is 800～850 DEG C, obtains steel plate crude product.Single pass is depressed
Rate is 10～35%.
（6）Heat treatment：Quenching Treatment is carried out to steel plate crude product, using secondary quenching+tempering process；Quenched for the first time
Cheng Zhong, hardening heat are 910～920 DEG C, 2.5～2.8min/mm of heat insulating coefficient, and using water 2h is directly entered during tapping, water-cooled adds
But, in second quenching process, hardening heat is 840～850 DEG C to quickly cooling, and 2.5～2.8min/mm of heat insulating coefficient is adopted during tapping
With water 2h is directly entered, water-cooled accelerates cooling；In drawing process, temperature is 620～640 DEG C, temperature retention time 3.5～
4.5min/mm.
Embodiment 1
The big thickness water power low-carbon bainite S550Q steel plates chemical composition of the present embodiment 550MPa levels and its mass fraction are shown in Table 1,
Thickness 260mm.
Production technology：（1）Smelting procedure：Molten steel is first smelted through first furnace, sends into LF refining furnace refine, and liquid steel temperature reaches
1560 DEG C proceed to VD stove Fruit storages, and vacuum is 65.0Pa, 26 minutes vacuum retention times.
（2）Continuous casting and electroslag remelting operation：23 DEG C of the degree of superheat, continuous casting obtains continuous casting billet；The average molten speed of electroslag remelting exists
23kg/min, adds aluminum shot 25g/t/min, and molten steel electroslag remelting is into ESR ingot.
（3）Heating process：Below 1000 DEG C programming rate be 110 DEG C/h, 1240 DEG C of maximum heating temperature, soaking temperature
1220～1230 DEG C, total 20h heat time heating time.
（4）Rolling process：The start rolling temperature that rolls of first stage is 1100 DEG C, and finishing temperature is 940 DEG C, adds up reduction ratio
40%；The start rolling temperature of second stage is 900 DEG C, and finishing temperature is 850 DEG C, and it is 30% to add up reduction ratio, two stage single pass
Reduction ratio is 12%.
（5）Heat treatment：In first time quenching process, hardening heat is 915 DEG C, and heat insulating coefficient 2.8min/mm is adopted during tapping
With water 2h is directly entered, water-cooled accelerates cooling, and in second quenching process, hardening heat is 845 DEG C, heat insulating coefficient 2.5min/mm,
Using water 2h is directly entered during tapping, water-cooled accelerates cooling；In drawing process, temperature is 635 DEG C, temperature retention time 4.0min/
mm.Obtain described single bainite structure steel plate.
The mechanical property of the present embodiment gained dual phase sheet steel：600 MPa of yield strength, tensile strength 670MPa, thickness of slab 1/4
The average 210J of -20 DEG C of ballistic works at place and 1/2, Z-direction performance are 57%.
Embodiment 2
The big thickness water power low-carbon bainite S550Q steel plates chemical composition of the present embodiment 550MPa levels and its mass fraction are shown in Table 1,
Thickness 250mm.
Production technology：（1）Smelting procedure：Molten steel is first smelted through first furnace, sends into LF refining furnace refine, and liquid steel temperature reaches
1560 DEG C proceed to VD stove Fruit storages, and vacuum is 65.0Pa, 26 minutes vacuum retention times.
（2）Continuous casting and electroslag remelting operation：23 DEG C of the degree of superheat, continuous casting obtains continuous casting billet；The average molten speed of electroslag remelting exists
23kg/min, adds aluminum shot 25g/t/min, and molten steel electroslag remelting is into ESR ingot.
（3）Heating process：Below 1000 DEG C programming rate be 115 DEG C/h, 1240 DEG C of maximum heating temperature, soaking temperature
1220～1230 DEG C, total 20h heat time heating time.
（4）Rolling process：The start rolling temperature that rolls of first stage is 1090 DEG C, and finishing temperature is 930 DEG C, adds up reduction ratio
38%；The start rolling temperature of second stage is 900 DEG C, and finishing temperature is 840 DEG C, and it is 30% to add up reduction ratio, two stage single pass
Reduction ratio is 11%.
（5）Heat treatment：In first time quenching process, hardening heat is 917 DEG C, and heat insulating coefficient 2.7min/mm is adopted during tapping
With water 2h is directly entered, water-cooled accelerates cooling, and in second quenching process, hardening heat is 850 DEG C, heat insulating coefficient 2.6min/mm,
Using water 2h is directly entered during tapping, water-cooled accelerates cooling；In drawing process, temperature is 638 DEG C, temperature retention time 4.0min/
mm.Obtain described single bainite structure steel plate.
The mechanical property of the present embodiment gained dual phase sheet steel：Yield strength 595MPa, tensile strength 665MPa, thickness of slab 1/4
The average 200J of -20 DEG C of ballistic works at place and 1/2, Z-direction performance are 59%.
Embodiment 3
The big thickness water power low-carbon bainite S550Q steel plates chemical composition of the present embodiment 550MPa levels and its mass fraction are shown in Table 1,
Thickness 200mm.
Production technology：（1）Smelting procedure：Molten steel is first smelted through first furnace, sends into LF refining furnace refine, and liquid steel temperature reaches
1560 DEG C proceed to VD stove Fruit storages, and vacuum is 65.0Pa, 26 minutes vacuum retention times.
（2）Molding：24 DEG C of the degree of superheat, molten steel is molded into steel ingot.
（3）Heating process：Below 1000 DEG C programming rate be 115 DEG C/h, 1240 DEG C of maximum heating temperature, soaking temperature
1220～1230 DEG C, total 16h heat time heating time.
（4）Rolling process：The start rolling temperature that rolls of first stage is 1080 DEG C, and finishing temperature is 920 DEG C, adds up reduction ratio
40%；The start rolling temperature of second stage is 890 DEG C, and finishing temperature is 830 DEG C, and it is 30% to add up reduction ratio, two stage single pass
Reduction ratio is 13%.
（5）Heat treatment：In first time quenching process, hardening heat is 916 DEG C, and heat insulating coefficient 2.6min/mm is adopted during tapping
With water 2h is directly entered, water-cooled accelerates cooling, and in second quenching process, hardening heat is 850 DEG C, heat insulating coefficient 2.6min/mm,
Using water 2h is directly entered during tapping, water-cooled accelerates cooling；In drawing process, temperature is 635 DEG C, temperature retention time 4.0min/
mm.Obtain described single bainite structure steel plate.
The mechanical property of the present embodiment gained dual phase sheet steel：Yield strength 620MPa, tensile strength 680MPa, thickness of slab 1/4
The average 230J of -20 DEG C of ballistic works at place and 1/2, Z-direction performance are 65%.
Embodiment 4
The big thickness water power low-carbon bainite S550Q steel plates chemical composition of the present embodiment 550MPa levels and its mass fraction are shown in Table 1,
Thickness 200mm.
Production technology：（1）Smelting procedure：Molten steel is first smelted through first furnace, sends into LF refining furnace refine, and liquid steel temperature reaches
1560 DEG C proceed to VD stove Fruit storages, and vacuum is 65.0Pa, 26 minutes vacuum retention times.
（2）Molding：23 DEG C of the degree of superheat, molten steel is molded into steel ingot.
（3）Heating process：Below 1000 DEG C programming rate be 115 DEG C/h, 1240 DEG C of maximum heating temperature, soaking temperature
1220～1230 DEG C, total 17h heat time heating time.
（4）Rolling process：The start rolling temperature that rolls of first stage is 1100 DEG C, and finishing temperature is 920 DEG C, adds up reduction ratio
40%；The start rolling temperature of second stage is 890 DEG C, and finishing temperature is 830 DEG C, and it is 30% to add up reduction ratio, two stage single pass
Reduction ratio is 13%.
（5）Heat treatment：In first time quenching process, hardening heat is 910～915 DEG C, and heat insulating coefficient 2.5min/mm goes out
Using water 2h is directly entered during steel, water-cooled accelerates cooling, and in second quenching process, hardening heat is 850 DEG C, heat insulating coefficient
2.5min/mm, using water 2h is directly entered during tapping, water-cooled accelerates cooling；In drawing process, temperature is 630 DEG C, during insulation
Between 4.0min/mm.Obtain described single bainite structure steel plate.
The mechanical property of the present embodiment gained dual phase sheet steel：Yield strength 615MPa, tensile strength 685MPa, thickness of slab 1/4
The average 230J of -20 DEG C of ballistic works at place and 1/2, Z-direction performance are 70%.
Embodiment 5
The big thickness water power low-carbon bainite S550Q steel plates chemical composition of the present embodiment 550MPa levels and its mass fraction are shown in Table 1,
Thickness 260mm.
Production technology：（1）Smelting procedure：First smelt through first furnace, send into LF refining furnace refine, liquid steel temperature reaches 1550
DEG C proceed to VD stove Fruit storages, vacuum is 66.6Pa, 20 minutes vacuum retention times.
（2）Continuous casting and electroslag remelting operation：20 DEG C of the degree of superheat, molten steel is molded into steel ingot.
（3）Heating process：Below 1000 DEG C programming rate be 118 DEG C/h, 1230 DEG C of maximum heating temperature, soaking temperature
1220～1230 DEG C, total 15h heat time heating time.
（4）Rolling process：The start rolling temperature that rolls of first stage is 1100 DEG C, and finishing temperature is 940 DEG C, adds up reduction ratio
40%；The start rolling temperature of second stage is 900 DEG C, and finishing temperature is 850 DEG C, and it is 35% to add up reduction ratio, two stage single pass
Reduction ratio is 35%.
（5）Heat treatment：In first time quenching process, hardening heat is 915 DEG C, and heat insulating coefficient 2.8min/mm is adopted during tapping
With water 2h is directly entered, water-cooled accelerates cooling, and in second quenching process, hardening heat is 845 DEG C, heat insulating coefficient 2.5min/mm,
Using water 2h is directly entered during tapping, water-cooled accelerates cooling；In drawing process, temperature is 635 DEG C, temperature retention time 3.5min/
mm.Obtain described single bainite structure steel plate.
Embodiment 6
The big thickness water power low-carbon bainite S550Q steel plates chemical composition of the present embodiment 550MPa levels and its mass fraction are shown in Table 1,
Thickness 260mm.
Production technology：（1）Smelting procedure：First smelt through first furnace, send into LF refining furnace refine, liquid steel temperature reaches 1570
DEG C proceed to VD stove Fruit storages, vacuum is 66.0Pa, 25 minutes vacuum retention times.
（2）Continuous casting and electroslag remelting operation：35 DEG C of the degree of superheat, continuous casting obtains continuous casting billet；The average molten speed of electroslag remelting exists
25kg/min, adds aluminum shot 22g/t/min, and molten steel electroslag remelting is into ESR ingot.
（3）Heating process：Below 1000 DEG C programming rate be 120 DEG C/h, 1240 DEG C of maximum heating temperature, soaking temperature
1220～1230 DEG C, total 20h heat time heating time.
（4）Rolling process：The start rolling temperature that rolls of first stage is 1100 DEG C, and finishing temperature is 940 DEG C, adds up reduction ratio
40%；The start rolling temperature of second stage is 900 DEG C, and finishing temperature is 850 DEG C, and it is 30% to add up reduction ratio, two stage single pass
Reduction ratio is 25%.
（5）Heat treatment：In first time quenching process, hardening heat is 920 DEG C, and heat insulating coefficient 2.6min/mm is adopted during tapping
With water 2h is directly entered, water-cooled accelerates cooling, and in second quenching process, hardening heat is 840 DEG C, heat insulating coefficient 2.8min/mm,
Using water 2h is directly entered during tapping, water-cooled accelerates cooling；In drawing process, temperature is 625 DEG C, temperature retention time 4.5min/
mm.Obtain described single bainite structure steel plate.
The chemical composition of 1 embodiment 1-6 steel plate of table and its weight/mass percentage composition（wt%）
| C | Si | Mn | Ni | P | S | Al | Nb | V | Cr | Mo | |
| Embodiment 1 | 0.15 | 0.32 | 1.05 | 1.08 | 0.008 | 0.003 | 0.075 | 0.030 | 0.040 | 0.37 | 0.43 |
| Embodiment 2 | 0.14 | 0.28 | 1.03 | 1.05 | 0.007 | 0.004 | 0.070 | 0.028 | 0.041 | 0.36 | 0.44 |
| Embodiment 3 | 0.15 | 0.32 | 1.07 | 1.04 | 0.007 | 0.002 | 0.025 | 0.030 | 0.035 | 0.37 | 0.40 |
| Embodiment 4 | 0.16 | 0.28 | 1.03 | 1.05 | 0.008 | 0.002 | 0.0305 | 0.028 | 0.038 | 0.36 | 0.43 |
| Embodiment 5 | 0.17 | 0.20 | 1.00 | 1.20 | 0.010 | 0.005 | 0.040 | 0.040 | 0.050 | 0.50 | 0.40 |
| Embodiment 6 | 0.16 | 0.40 | 1.20 | 1.00 | 0.005 | 0.005 | 0.060 | 0.020 | 0.035 | 0.30 | 0.50 |
Above example only in order to illustrative and not limiting technical scheme, although entering to the present invention with reference to above-described embodiment
Go detailed description, it will be understood by those within the art that：Still the present invention can be modified or be equal to replace
Change, any modification or partial replacement without departing from the spirit and scope of the present invention, which all should cover the right in the present invention will
Ask in the middle of scope.
Claims (9)
1. big thickness S550Q steel plates of a kind of 550MPa levels, it is characterised in that the steel plate chemical composition and weight/mass percentage composition are such as
Under：C：0.14～0.17%, Si：0.20～0.40%, Mn：1.00～1.20%, Ni：1.00～1.20%, P≤0.010%, S≤
0.005%, Nb：0.020～0.040%, V：0.035～0.050%, Cr：0.30～0.50%, Mo：0.40～0.50%, steel ingot into
Al during material：0.020～0.040% or ESR ingot Al when becoming a useful person：0.060～0.080%, balance of Fe and inevitable impurity.
2. big thickness S550Q steel plates of 550MPa levels according to claim 1, it is characterised in that the maximum of the steel plate is thick
Spend for 260 millimeters.
3. the production method of the big thickness S550Q steel plates of a kind of 550MPa levels, it is characterised in that the production method include heating,
Rolling and heat treatment step；The steel plate chemical composition and weight/mass percentage composition are as follows：C：0.14～0.17%, Si：0.20～
0.40%, Mn：1.00～1.20%, Ni：1.00～1.20%, P≤0.010%, S≤0.005%, Nb：0.020～0.040%, V：
0.035～0.050%, Cr：0.30～0.50%, Mo：0.40～0.50%, Al when steel ingot is become a useful person：0.020～0.040%, ESR ingot
Al when becoming a useful person：0.060～0.080%, balance of Fe and inevitable impurity.
4. the production method of the big thickness S550Q steel plates of 550MPa levels according to claim 3, it is characterised in that described roll
Operation processed：Using two-stage rolling mill practice；The rolling temperature of first stage be 1080 DEG C～1130 DEG C, add up reduction ratio be 40～
55%；The rolling temperature of second stage is 870～910 DEG C, and it is 20～35% to add up reduction ratio, and finishing temperature is 800～850
DEG C, roll rear ACC water-cooleds.
5. the production method of the big thickness S550Q steel plates of 550MPa levels according to claim 4, it is characterised in that described
The start rolling temperature in one stage is 1080～1130 DEG C, and finishing temperature is 920～950 DEG C；The start rolling temperature of the second stage is
870～910 DEG C, finishing temperature is 800～850 DEG C, rolls rear ACC water-cooleds.
6. the production method of the big thickness S550Q steel plates of 550MPa levels according to claim 4, it is characterised in that described
The single pass reduction ratio of one stage and second stage is 10～35%.
7. the production method of the big thickness S550Q steel plates of 550MPa levels according to claim 3, it is characterised in that the heat
Treatment process：Using secondary quenching+tempering process；In first time quenching process, hardening heat is 910～920 DEG C, insulation system
2.5～2.8min/mm of number, using water 2h is directly entered during tapping, water-cooled accelerates cooling, in second quenching process, hardening heat
For 840～850 DEG C, 2.5～2.8min/mm of heat insulating coefficient, using water 2h is directly entered during tapping, water-cooled accelerates cooling；It was tempered
Cheng Zhong, temperature are 620～640 DEG C, 3.5～4.5min/mm of temperature retention time.
8. the production method of the big thickness S550Q steel plates of 550MPa levels according to claim 3-7 any one, its feature
It is, production method pattern of becoming a useful person is become a useful person for steel ingot, heating process maximum heating temperature is 1230 DEG C, below 1000 DEG C
Programming rate is 100～120 DEG C/h, and soaking temperature is 1220～1230 DEG C, total 15-20h heat time heating time.
9. the production method of the big thickness S550Q steel plates of 550MPa levels according to claim 3-7 any one, its feature
It is, production method pattern of becoming a useful person is become a useful person for continuous casting+electroslag remelting, 1240 DEG C of heating process maximum heating temperature,
Less than 1000 DEG C programming rates are 100～120 DEG C/h, 1220～1230 DEG C of soaking temperature, total 15-20h heat time heating time.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109182690A (en) * | 2018-09-20 | 2019-01-11 | 舞阳钢铁有限责任公司 | A kind of heat treatment method of 550MPa grades of steel plate whole plate face performance uniformity |
| CN109576449A (en) * | 2018-12-27 | 2019-04-05 | 江阴兴澄特种钢铁有限公司 | A kind of production method resisted remanent magnetism and increase, save the 9Ni steel plate of production energy consumption |
| CN109609840A (en) * | 2018-12-03 | 2019-04-12 | 南阳汉冶特钢有限公司 | 180~200mm of one kind thickness structural alloy steel 27SiMn and its production technology |
| JP2019173081A (en) * | 2018-03-28 | 2019-10-10 | 日本製鉄株式会社 | High hardness steel plate excellent in hardness at plate thickness center part and low temperature toughness and having plate thickness of over 200 mm and method of producing the same |
| CN110952034A (en) * | 2019-11-28 | 2020-04-03 | 舞阳钢铁有限责任公司 | Large-thickness hydroelectric S550Q steel plate and production method thereof |
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| CN104988422A (en) * | 2015-07-29 | 2015-10-21 | 舞阳钢铁有限责任公司 | Extremely-thick hardening and tempering high-strength steel plate for water and electricity and production method thereof |
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| CN104988422A (en) * | 2015-07-29 | 2015-10-21 | 舞阳钢铁有限责任公司 | Extremely-thick hardening and tempering high-strength steel plate for water and electricity and production method thereof |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2019173081A (en) * | 2018-03-28 | 2019-10-10 | 日本製鉄株式会社 | High hardness steel plate excellent in hardness at plate thickness center part and low temperature toughness and having plate thickness of over 200 mm and method of producing the same |
| CN109182690A (en) * | 2018-09-20 | 2019-01-11 | 舞阳钢铁有限责任公司 | A kind of heat treatment method of 550MPa grades of steel plate whole plate face performance uniformity |
| CN109609840A (en) * | 2018-12-03 | 2019-04-12 | 南阳汉冶特钢有限公司 | 180~200mm of one kind thickness structural alloy steel 27SiMn and its production technology |
| CN109576449A (en) * | 2018-12-27 | 2019-04-05 | 江阴兴澄特种钢铁有限公司 | A kind of production method resisted remanent magnetism and increase, save the 9Ni steel plate of production energy consumption |
| CN109576449B (en) * | 2018-12-27 | 2020-10-30 | 江阴兴澄特种钢铁有限公司 | Production method of 9Ni steel plate capable of resisting residual magnetism increase and saving production energy consumption |
| CN110952034A (en) * | 2019-11-28 | 2020-04-03 | 舞阳钢铁有限责任公司 | Large-thickness hydroelectric S550Q steel plate and production method thereof |
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