CN104073718B - The production method of high tenacity S355J2 steel plate - Google Patents
The production method of high tenacity S355J2 steel plate Download PDFInfo
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Abstract
The invention discloses a kind of production method of high tenacity S355J2 steel plate, comprise smelting, continuous casting, slab reheat the process shaping with steel plate rolling.The present invention obtains the S355J2 steel plate of high tenacity by suitable heating, controlled rolling, cooling control technology.
Description
Technical field
The present invention relates to a kind of material technology, specifically, relate to a kind of production method of high tenacity S355J2 steel plate.
Background technology
S355J2 belongs to the low-alloy high-tensile structural steel adopting Europe superscript standard production, is widely used in various manufacturing field.Under the working condition being used in various complexity with the equipment that this material makes and physical environment.Therefore require that material not only has higher-strength and plasticity, also should have good toughness, also do not lose efficacy to ensure that material uses under various load and low temperature condition, extension device work-ing life, support equipment uses and personnel safety.
Because S355J2 requires higher intensity and toughness, present complex manufacturing, the production cycle is long, manufacturing cost is high; Although or production technique is simple, the steel plate of some thickness specification can not be produced, though the impelling strength of steel plate meets standard-required simultaneously, rich amount is obviously on the low side.
Publication number CN101654760A patent discloses a kind of unalloyed structural steel S 355 J 2 steel plate and production method thereof.The armor plate strength produced by the method and toughness all meet standard-required.But the method is not suitable for the Plate Production of below 20mm thickness specification; The draft of first stage, subordinate phase requires all comparatively large, and in actual production, due to the restriction of slab thickness and steel plate width, thick steel plates is usually difficult to meet; The affluence amount of ballistic work is on the low side simultaneously.
Summary of the invention
Technical problem solved by the invention is to provide a kind of production method of high tenacity S355J2 steel plate, is obtained the S355J2 steel plate of high tenacity by suitable heating, controlled rolling, cooling control technology.
Technical scheme is as follows:
A production method for high tenacity S355J2 steel plate, comprises smelting, continuous casting, slab reheats the process shaping with steel plate rolling, wherein;
Slab reheats in process, adopts the thick continuously cast bloom of 250mm to produce, slab tapping temperature 1185-1215 DEG C, 290 ~ 420 minutes heat-up times;
In steel plate rolling moulding process, roll forming for 10mm ~ 25mm Plate Steel: heating of plate blank well carries out controlled rolling afterwards, first stage open rolling thickness is slab thickness, first stage start rolling temperature 1175 ~ 1205 DEG C, first stage finishing temperature >=980 DEG C, first stage single pass draft >=10%; The open rolling thickness of subordinate phase steel plate is 3 times of finished steel plate thickness, and subordinate phase steel plate start rolling temperature is 890 ~ 980 DEG C, and subordinate phase finishing temperature is 810 ~ 840 DEG C; Subordinate phase rolling 5 ~ 6 passage; Steel plate rolls after thermal straightening machine aligning, natural air cooling;
Roll forming for being greater than 25mm ~ 60mm Plate Steel: heating of plate blank well carries out controlled rolling afterwards, first stage open rolling thickness is slab thickness, first stage start rolling temperature 1175 ~ 1205 DEG C, first stage finishing temperature > 980 DEG C, single pass draft >=10% during first stage high temperature extension rolling; The open rolling thickness of subordinate phase steel plate is 2 ~ 3 times of finished steel plate thickness, and subordinate phase steel plate start rolling temperature is 870 ~ 890 DEG C, and subordinate phase finishing temperature is 805 ~ 845 DEG C; Subordinate phase rolling 5 ~ 6 passage; Carry out section cooling after steel plate rolls, speed of cooling is 6 ~ 12 DEG C/s, and final cooling temperature is 680 ~ 720 DEG C; Finished product high tenacity S355J2 steel plate thickness is 10mm ~ 60mm;
The chemical composition of finished product high tenacity S355J2 steel plate by weight percentage, comprise: C0.15 ~ 0.16%, Si:0.35 ~ 0.45%, Mn1.5 ~ 1.6%, P≤0.015%, S≤0.005%Nb:0.025 ~ 0.035%, Ca0.0015 ~ 0.003%, Als0.017 ~ 0.03%, Ti0.006 ~ 0.01, all the other are iron and impurity.
Further: slab tapping temperature is 1215 DEG C, slab heating time is 354 minutes, first stage start rolling temperature is 1205 DEG C, it is 1120 DEG C that temperature is rolled in first stage finish to gauge, and it is 10% that first stage high temperature extends the minimum single pass draft of rolling, and subordinate phase open rolling thickness is 75mm, subordinate phase start rolling temperature is 890 DEG C, subordinate phase finishing temperature is 810 DEG C, subordinate phase rolling 6 passage, is rolled into the steel plate that thickness is 25mm; The chemical composition of finished product high tenacity S355J2 steel plate by weight percentage, comprising: C0.15%, Si0.45%, Mn1.55%, P0.011%, S0.005%, Nb0.025%, Als0.03%, Ca0.003%, Ti0.006%, and surplus is Fe and impurity.
Further: slab tapping temperature is 1202 DEG C, slab heating time is 386 minutes, and first stage start rolling temperature is 1192 DEG C, and it is 1120 DEG C that temperature is rolled in first stage finish to gauge, it is 11% that first stage high temperature extends the minimum single pass draft of rolling, subordinate phase open rolling thickness is 75mm, and subordinate phase start rolling temperature is 890 DEG C, and subordinate phase finishing temperature is 845 DEG C, final cooling temperature is 720 DEG C, subordinate phase rolling 6 passage, rate of cooling 12 DEG C/s, is rolled into the steel plate that thickness is 30mm; The chemical composition of finished product high tenacity S355J2 steel plate by weight percentage, comprise: C0.16%, Si0.41%, Mn1.59%, P0.009%, S0.001%, Nb0.027%, Als0.024%, Ca0.0021%, Ti0.007%, surplus is Fe and impurity.
Compared with prior art, the technology of the present invention effect comprises:
1, the present invention adopts low cost Composition Design, on the basis of traditional C-Mn steel, only adds the Nb of trace, the S355J2 steel plate of high tenacity of having been arrived by suitable heating, controlled rolling, cooling control technology.Eliminate thermal treatment process, operational path is simple, low cost of manufacture.
2, the intensity of steel plate, plasticity, toughness are good.The intensity of steel plate is between 390MPa ~ 450MPa, and tensile strength is between 550 ~ 580MPa, and unit elongation is between 27% ~ 32.5%, and-20 DEG C of ballistic works are between 220J ~ 302J.
3, the composition of steel plate and technological design reasonable, process system is relatively looser, can on generous printed line stably manufactured.
4, this S355J2 steel grade steel plate 10000 tons of 10mm ~ 60mm was produced with 1 year, profit per ton 200 yuan calculating.Profit 2,000,000 yuan within 1 year, can be increased, there is good economic benefit.This steel plate toughness is good, can use at low ambient temperatures.Manufacturing process is simple, and energy consumption is low, and fuel consumption is few, has positive social benefit.
Accompanying drawing explanation
Fig. 1 is the metallographic structure figure of the steel plate of the embodiment of the present invention 1;
Fig. 2 is the metallographic structure figure of the steel plate of the embodiment of the present invention 2;
Fig. 3 is the metallographic structure figure of the steel plate of the embodiment of the present invention 3;
Fig. 4 is the metallographic structure figure of the steel plate of the embodiment of the present invention 4;
Fig. 5 is the metallographic structure figure of the steel plate of the embodiment of the present invention 5;
Fig. 6 is the metallographic structure figure of the steel plate of the embodiment of the present invention 6.
Embodiment
The present invention adopts low cost Composition Design, on the basis of traditional C-Mn steel, only adds the Nb of trace, just obtained the S355J2 steel plate of high tenacity by suitable heating, controlled rolling, cooling control technology.
The production method of high tenacity S355J2 steel plate, specific as follows:
Step 1: smelt and continuous casting;
(1) molten iron adopts Mg-basic desulphuration, adopts top bottom blowing in converter;
(2) molten steel is through the refining of LF stove, requires S≤0.003% in molten steel;
(3) molten steel carries out the process of RH stove, and under vacuum tightness is no more than 133Pa, the treatment time is not less than 30 minutes.
(4) thickness of continuously cast bloom is 250mm, and adopt induction stirring and slighter compress during continuous casting, induction stirring frequency is 6Hz, electric current 280A, and depressing position is 6,7,8 sections, and draught is 2mm, 2mm, 2mm.Adopt induction stirring and soft reduction technique, object reduces steel plate center segregation, improves slab internal soundness.
Step 2: slab reheats;
The thick continuously cast bloom of 250mm is adopted to produce, continuously cast bloom (slab) tapping temperature 1185-1215 DEG C, 290 ~ 420 minutes heat-up times.
Step 3: steel plate rolling is shaping;
For 10mm ~ 25mm Plate Steel roll forming technique: heating of plate blank well carries out controlled rolling afterwards, first stage (roughing) open rolling thickness is slab thickness, first stage start rolling temperature 1175 ~ 1205 DEG C, first stage finishing temperature >=980 DEG C, first stage single pass draft >=10%; The open rolling thickness of subordinate phase (finish rolling) steel plate is 3 times of finished steel plate thickness, and subordinate phase steel plate start rolling temperature is 890 ~ 980 DEG C, and subordinate phase finishing temperature is 810 ~ 840 DEG C; Subordinate phase rolling 5 ~ 6 passage; Steel plate rolls after thermal straightening machine aligning, natural air cooling.
For being greater than 25mm ~ 60mm Plate Steel roll forming technique: heating of plate blank well carries out controlled rolling afterwards, first stage open rolling thickness is slab thickness, first stage start rolling temperature 1175 ~ 1205 DEG C, first stage finishing temperature > 980 DEG C, single pass draft >=10% during first stage high temperature extension rolling; The open rolling thickness of subordinate phase steel plate is 2 ~ 3 times of finished steel plate thickness, and subordinate phase steel plate start rolling temperature is 870 ~ 890 DEG C, and subordinate phase finishing temperature is 805 ~ 845 DEG C; Subordinate phase rolling 5 ~ 6 passage; Carry out section cooling after steel plate rolls, speed of cooling is 6 ~ 12 DEG C/s, and final cooling temperature is 680 ~ 720 DEG C.Steel plate thickness of the present invention is that 10mm ~ 60mm is thick.
The chemical composition of finished product high tenacity S355J2 steel plate by weight percentage, comprise: C0.15 ~ 0.16%, Si:0.35 ~ 0.45%, Mn1.5 ~ 1.6%, P≤0.015%, S≤0.005%Nb:0.025 ~ 0.035%, Ca0.0015 ~ 0.003%, Als (dissolved aluminum) 0.017 ~ 0.03%, Ti0.006 ~ 0.01, all the other are iron and inevitable impurity.
The above-mentioned continuously cast bloom heated in austenite recrystallization district, Unhydrated cement carries out controlled rolling.The rolling of above-mentioned first stage is the controlled rolling of austenite recrystallization district, this one-phase adopts and depresses rolling strategy greatly, require single pass draft >=10%, object ensures that rolling deformation fully can infiltrate into steel plate heart portion, steel plate after distortion fully can carry out recrystallize, and there will not be mixed crystal phenomenon, and by the austenite recrystallization controlled rolling of high-temperature zone, abundant fining austenite grains; After austenite recrystallization controlled rolling terminates, intermediate blank swings cooling on roller-way, is cooled to subordinate phase start rolling temperature and starts rolling.The rolling of subordinate phase belongs to non-Controlled Cooling, the rolling temperature of subordinate phase is lower, steel plate is rolling deformation at a lower temperature, the Carbonitride Precipitation of deformation induced Nb, pinning dislocation, hinder crystal grain recrystallize, such intra-die produces strain under rolling deformation, by multi-pass rolling, intra-die have accumulated a large amount of deformation energies and phase transformation nucleation site; And after rolling faster under speed of cooling, finally obtain tiny ferrite crystal grain, obtain ductility steel plate.
Below in conjunction with embodiment, the invention will be further described.
Embodiment 1
Thickness is adopted to be 250mm slab, slab tapping temperature is 1185 DEG C, slab heating time is 290 minutes, (weight percent) chemical composition of slab is: C0.17%, Si0.35%, Mn1.6%, P0.015%, S0.002%, Nb0.035%, Als0.017%, Ca0.0025, Ti0.01%, and surplus is Fe and inevitable impurity.Be rolled into the steel plate that thickness is 10mm, detailed rolling and cold technique of going are in table 1, and its mechanical property is in table 2.
As shown in Figure 1, be the metallographic structure figure of the steel plate of embodiment in the present invention 1.As can be seen from this metallograph, steel plate be organized as ferrite+perlite, ferrite is in the great majority, uniform small grains, does not have mixed crystal phenomenon.Due to ferrite be in the great majority, crystal grain is tiny, and ferrite has good plasticity, toughness, and therefore the steel plate of this tissue has good toughness and higher intensity.
Table 1 rolling and process for cooling
Table 2 mechanical property of steel plate
Embodiment 2
Thickness is adopted to be 250mm slab, slab tapping temperature is 1215 DEG C, slab heating time is 354 minutes, (weight percent) chemical composition of slab is: C0.15%, Si0.45%, Mn1.55%, P0.011%, S0.005%, Nb0.025%, Als0.03%, Ca0.003%, Ti0.006%, and surplus is Fe and inevitable impurity.Be rolled into the steel plate that thickness is 25mm, detailed rolling and cold technique of going are in table 3, and its mechanical property is in table 4.
As shown in Figure 2, be the metallographic structure figure of the steel plate of embodiment in the present invention 2.As can be seen from this metallograph, steel plate be organized as ferrite+perlite, ferrite is in the great majority, uniform small grains, does not have mixed crystal phenomenon.Due to ferrite be in the great majority, crystal grain is tiny, and ferrite has good plasticity, toughness, and therefore the steel plate of this tissue has good toughness and higher intensity.
Table 3 rolling and process for cooling
Table 4 mechanical property of steel plate
Embodiment 3
Thickness is adopted to be 250mm slab, slab tapping temperature is 1204 DEG C, slab heating time is 420 minutes, (weight percent) chemical composition of slab is: C0.16%, Si0.42%, Mn1.5%, P0.008%, S0.003%, Nb0.029%, Als0.024%, Ca0.0024%, Ti0.008%, and surplus is Fe and inevitable impurity.Be rolled into the steel plate that thickness is 20mm, detailed rolling and cold technique of going are in table 5, and its mechanical property is in table 6.
As shown in Figure 3, be the metallographic structure figure of the steel plate of embodiment in the present invention 3.As can be seen from this metallograph, steel plate be organized as ferrite+perlite, ferrite is in the great majority, uniform small grains, does not have mixed crystal phenomenon.Due to ferrite be in the great majority, crystal grain is tiny, and ferrite has good plasticity, toughness, and therefore the steel plate of this tissue has good toughness and higher intensity.
Table 5 rolling and process for cooling
Table 6 mechanical property of steel plate
Embodiment 4
Thickness is adopted to be 250mm slab, slab tapping temperature is 1202 DEG C, slab heating time is 386 minutes, (weight percent) chemical composition of slab is: C0.16%, Si0.41%, Mn1.59%, P0.009%, S0.001%, Nb0.027%, Als0.024%, Ca0.0021%, Ti0.007%, and surplus is Fe and inevitable impurity.Be rolled into the steel plate that thickness is 30mm, detailed rolling and cold technique of going are in table 7, and its mechanical property is in table 8.
As shown in Figure 4, be the metallographic structure figure of the steel plate of embodiment in the present invention 4.As can be seen from this metallograph, steel plate be organized as ferrite+perlite, ferrite is in the great majority, uniform small grains, does not have mixed crystal phenomenon.Due to ferrite be in the great majority, crystal grain is tiny, and ferrite has good plasticity, toughness, and therefore the steel plate of this tissue has good toughness and higher intensity.
Table 7 rolling and process for cooling
Table 8 mechanical property of steel plate
Embodiment 5
Thickness is adopted to be 250mm slab, slab tapping temperature is 1198 DEG C, slab heating time is 368 minutes, (weight percent) chemical composition of slab is: C0.17%, Si0.38%, Mn1.59%, P0.013%, S0.002%, Nb0.029%, Als0.025%, Ca0.0026%, Ti0.008%, and surplus is Fe and inevitable impurity.Be rolled into the steel plate that thickness is 60mm, detailed rolling and cold technique of going are in table 9, and its mechanical property is in table 10.
As shown in Figure 5, be the metallographic structure figure of the steel plate of embodiment in the present invention 5.As can be seen from this metallograph, steel plate be organized as ferrite+perlite, ferrite is in the great majority, uniform small grains, does not have mixed crystal phenomenon.Due to ferrite be in the great majority, crystal grain is tiny, and ferrite has good plasticity, toughness, and therefore the steel plate of this tissue has good toughness and higher intensity.
Table 9 rolling and process for cooling
Table 10 mechanical property of steel plate
Embodiment 6
Thickness is adopted to be 250mm slab, slab tapping temperature is 1203 DEG C, slab heating time is 345 minutes, (weight percent) chemical composition of slab is: C0.16%, Si0.41%, Mn1.6%, P0.01%, S0.001%, Nb0.028%, Als0.027%, Ca0.0023%, Ti0.007%, and surplus is Fe and inevitable impurity.Be rolled into the steel plate that thickness is 40mm, detailed rolling and cold technique of going are in table 11, and its mechanical property is in table 12.
As shown in Figure 6, be the metallographic structure figure of the steel plate of embodiment in the present invention 6.As can be seen from this metallograph, steel plate be organized as ferrite+perlite, ferrite is in the great majority, uniform small grains, does not have mixed crystal phenomenon.Due to ferrite be in the great majority, crystal grain is tiny, and ferrite has good plasticity, toughness, and therefore the steel plate of this tissue has good toughness and higher intensity.
Table 11 rolling and process for cooling
Table 12 mechanical property of steel plate
Claims (3)
1. a production method for high tenacity S355J2 steel plate, is characterized in that: comprise smelting, continuous casting, slab reheat the process shaping with steel plate rolling, wherein;
Slab reheats in process, adopts the thick continuously cast bloom of 250mm to produce, slab tapping temperature 1185-1215 DEG C, 290 ~ 420 minutes heat-up times;
In steel plate rolling moulding process, roll forming for 10mm ~ 25mm Plate Steel: heating of plate blank well carries out controlled rolling afterwards, first stage open rolling thickness is slab thickness, first stage start rolling temperature 1175 ~ 1205 DEG C, first stage finishing temperature >=980 DEG C, first stage single pass draft >=10%; The open rolling thickness of subordinate phase steel plate is 3 times of finished steel plate thickness, and subordinate phase steel plate start rolling temperature is 890 ~ 980 DEG C, and subordinate phase finishing temperature is 810 ~ 840 DEG C; Subordinate phase rolling 5 ~ 6 passage; Steel plate rolls after thermal straightening machine aligning, natural air cooling;
Roll forming for being greater than 25mm ~ 60mm Plate Steel: heating of plate blank well carries out controlled rolling afterwards, first stage open rolling thickness is slab thickness, first stage start rolling temperature 1175 ~ 1205 DEG C, first stage finishing temperature > 980 DEG C, single pass draft >=10% during first stage high temperature extension rolling; The open rolling thickness of subordinate phase steel plate is 2 ~ 3 times of finished steel plate thickness, and subordinate phase steel plate start rolling temperature is 870 ~ 890 DEG C, and subordinate phase finishing temperature is 805 ~ 845 DEG C; Subordinate phase rolling 5 ~ 6 passage; Carry out section cooling after steel plate rolls, speed of cooling is 6 ~ 12 DEG C/s, and final cooling temperature is 680 ~ 720 DEG C; Finished product high tenacity S355J2 steel plate thickness is 10mm ~ 60mm;
The chemical composition of finished product high tenacity S355J2 steel plate by weight percentage, comprise: C0.15 ~ 0.16%, Si:0.35 ~ 0.45%, Mn1.5 ~ 1.6%, P≤0.015%, S≤0.005%, Nb:0.025 ~ 0.035%, Ca0.0015 ~ 0.003%, Als0.017 ~ 0.03%, Ti0.006 ~ 0.01, all the other are iron and impurity.
2. the production method of high tenacity S355J2 steel plate as claimed in claim 1, it is characterized in that: slab tapping temperature is 1215 DEG C, slab heating time is 354 minutes, first stage start rolling temperature is 1205 DEG C, it is 1120 DEG C that temperature is rolled in first stage finish to gauge, it is 10% that first stage high temperature extends the minimum single pass draft of rolling, subordinate phase open rolling thickness is 75mm, subordinate phase start rolling temperature is 890 DEG C, subordinate phase finishing temperature is 810 DEG C, subordinate phase rolling 6 passage, is rolled into the steel plate that thickness is 25mm; The chemical composition of finished product high tenacity S355J2 steel plate by weight percentage, comprising: C0.15%, Si0.45%, Mn1.55%, P0.011%, S0.005%, Nb0.025%, Als0.03%, Ca0.003%, Ti0.006%, and surplus is Fe and impurity.
3. the production method of high tenacity S355J2 steel plate as claimed in claim 1, it is characterized in that: slab tapping temperature is 1202 DEG C, slab heating time is 386 minutes, first stage start rolling temperature is 1192 DEG C, it is 1120 DEG C that temperature is rolled in first stage finish to gauge, it is 11% that first stage high temperature extends the minimum single pass draft of rolling, subordinate phase open rolling thickness is 75mm, subordinate phase start rolling temperature is 890 DEG C, subordinate phase finishing temperature is 845 DEG C, final cooling temperature is 720 DEG C, subordinate phase rolling 6 passage, rate of cooling 12 DEG C/s, be rolled into the steel plate that thickness is 30mm, the chemical composition of finished product high tenacity S355J2 steel plate by weight percentage, comprise: C0.16%, Si0.41%, Mn1.59%, P0.009%, S0.001%, Nb0.027%, Als0.024%, Ca0.0021%, Ti0.007%, surplus is Fe and impurity.
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| CN106148817A (en) * | 2015-04-27 | 2016-11-23 | 鞍钢股份有限公司 | Production method of S355J2 wind power steel |
| CN108754318B (en) * | 2018-06-04 | 2020-06-02 | 包头钢铁（集团）有限责任公司 | 550 MPa-grade steel plate and manufacturing method of 550 MPa-grade steel plate |
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