CN104018064A - Low-cost Q345R steel plate and production method thereof - Google Patents
Low-cost Q345R steel plate and production method thereof Download PDFInfo
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Abstract
The invention discloses a low-cost Q345R steel plate which comprises the following chemical components in percentage by weight: 0.16-0.18% of C, 0.2-0.3% of Si, 1.3-1.5% of Mn, at most 0.02% of P, at most 0.005% of S, 0.0015-0.003% of Ca, 0.017-0.027% of Als, and the balance of iron and impurities. The invention also discloses a production method of the low-cost Q345R steel plate. The low-cost Q345R steel plate can be produced by proper heating, controlled rolling and controlled cooling; and no expensive alloy elements, such as Nb, V, Ti and the like, are added to the steel plate, so the production cost is low.
Description
Technical field
Originally the invention belongs to material processing field, specifically, relate to a kind of low cost Q345R steel plate and production method thereof.
Background technology
Application number 201210182417.5, title the invention discloses a kind of large thickness steel heavy plate for pressure vessels and preparation method thereof, large its chemical composition of thickness steel heavy plate for pressure vessels is to be formed by the component melting of following weight percent: C:0.15%-0.18%, Si:0.25%-0.50%, Mn:1.50%-1.60%, P≤0.020%, S≤0.005%, Nb:0.030%-0.050%, Al:0.020%-0.050%; Steel plate is organized as ferrite, pearlitic structure.The chemical composition design of steel plate of the present invention adopts cheap carbon, manganese solution strengthening, adds a small amount of alloying element, accelerates the cooling steel plate that obtains by water-cooled after normalizing.
Q345R steel plate is the main raw of producing pressurized vessel, is widely used in the production of various pressurized vessels, as the device fabrications such as pressure gas tank, gas cylinder, reactor all will be used Q345R steel plate.Q345R steel plate has higher intensity, good plasticity, toughness.For ensureing intensity and the toughness of Q345R steel plate, generally in the time producing, all can add the microalloy such as Nb, V, the membership that adds of Nb, V alloy significantly increases steel plate cost; And add after Nb in Q345R steel plate, slab easily cracks in the time of casting, and slab is carried out to removing surface, can greatly increase workman's labor capacity, and reduce lumber recovery.
Summary of the invention
Technical problem solved by the invention is to provide a kind of low cost Q345R steel plate, and the intensity of steel plate, plasticity, toughness are good.
Technical scheme is as follows:
A kind of low cost Q345R steel plate, its chemical composition by weight percentage, comprising: C0.16～0.18%, Si0.2～0.3%, Mn1.3～1.5%, P≤0.02%, S≤0.005%, Ca0.0015～0.003%, Als0.017～0.027%; All the other are iron and impurity.
Further, its chemical composition by weight percentage, comprise: C0.16%, Si0.29%～0.3%, Mn1.3%～1.45%, P0.009%～0.02%, S0.003%, Als0.017%～0.024%, Ca0.0015%～0.0021%, surplus is Fe and impurity.
Further, its chemical composition by weight percentage, comprise: C0.17%, Si0.22%～0.24%, Mn1.41%～1.43%, P0.008%～0.012%, S0.002%, Als0.021%～0.022%, Ca0.0018%～0.0023%, surplus is Fe and impurity.
Further, its chemical composition by weight percentage, comprising: C0.18%, Si0.4%, Mn1.5%, P0.011%, S0.005%, Als0.027%, Ca0.0025%, surplus is Fe and impurity.
Another technical problem solved by the invention is to provide a kind of production method of low cost Q345R steel plate, just can produce Q345R steel plate by suitable heating, controlled rolling, cooling control technology, steel plate does not add the alloying element that Nb, V, Ti etc. are expensive, and production cost is low.
Technical scheme is as follows:
A production method for low cost Q345R steel plate, step comprises that smelting, continuous casting, slab reheat; Wherein, slab reheats in process, adopts the thick continuously cast bloom of 250mm to produce, the tapping temperature 1170-1200 DEG C that slab reheats, 280～400 minutes heat-up times;
In the time of rolling 10mm～30mm Plate Steel, after reheating, carry out controlled rolling, first stage open rolling thickness is slab thickness, 1160～1190 DEG C of first stage start rolling temperatures, first stage roll speed is 1m/s, single pass draft >=10% when first stage high temperature extends rolling; 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 880～980 DEG C, and subordinate phase finishing temperature is 790～820 DEG C, subordinate phase rolling 5～6 passages; Steel plate rolls natural air cooling after thermal straightening machine aligning;
In the time that rolling is greater than 30mm～40mm Plate Steel, after reheating, carry out controlled rolling, first stage open rolling thickness is slab thickness, 1160～1190 DEG C of first stage start rolling temperatures, first stage roll speed is 0.8m/s, single pass draft >=12% when first stage high temperature extends rolling; The open rolling thickness of subordinate phase steel plate is 2.5～3 times of finished steel plate thickness, and subordinate phase steel plate start rolling temperature is 870 DEG C, and subordinate phase finishing temperature is 800～810 DEG C, subordinate phase rolling 6 passages; After steel plate rolls, carry out laminar flow cooling, speed of cooling is 8 DEG C/s, and final cooling temperature is 670～690 DEG C;
The chemical composition of finished steel plate by weight percentage, comprising: C0.16～0.18%, Si0.2～0.3%, Mn1.3～1.5%, P≤0.02%, S≤0.005%, Ca0.0015～0.003%, Als0.017～0.027%; All the other are iron and impurity.
Further, slab tapping temperature is 1170 DEG C, the heating of plate blank time is 280 minutes, 1160 DEG C of first stage start rolling temperatures, and first stage high temperature extends the minimum single pass draft 10% of rolling, first stage roll speed 1m/s, subordinate phase open rolling thickness 90mm, 880 DEG C of subordinate phase start rolling temperatures, 790 DEG C of subordinate phase finishing temperatures, subordinate phase rolling 6 passages, are rolled into the steel plate that thickness is 30mm; The chemical composition of finished steel plate by weight percentage, comprising: C0.16%, Si0.3%, Mn1.3%, P0.02%, S0.003%, Als0.017%, Ca0.0015%, surplus is Fe and impurity.
Further, slab tapping temperature is 1200 DEG C, the heating of plate blank time is 400 minutes, 1190 DEG C of first stage start rolling temperatures, and first stage high temperature extends the minimum single pass draft 15% of rolling, first stage roll speed 1m/s, subordinate phase open rolling thickness 30mm, 980 DEG C of subordinate phase start rolling temperatures, 820 DEG C of subordinate phase finishing temperatures, subordinate phase rolling 5 passages, are rolled into the steel plate that thickness is 10mm; The chemical composition of finished steel plate by weight percentage, comprising: C0.18%, Si0.4%, Mn1.5%, P0.011%, S0.005%, Als0.027%, Ca0.0025%, surplus is Fe and impurity.
Further, slab tapping temperature is 1195 DEG C, the heating of plate blank time is 363 minutes, 1185 DEG C of first stage start rolling temperatures, and first stage high temperature extends the minimum single pass draft 14% of rolling, first stage roll speed 1m/s, subordinate phase open rolling thickness 78mm, 890 DEG C of subordinate phase start rolling temperatures, 805 DEG C of subordinate phase finishing temperatures, subordinate phase rolling 6 passages, are rolled into the steel plate that thickness is 26mm; The chemical composition of finished steel plate by weight percentage, comprising: C0.17%, Si0.24%, Mn1.43%, P0.008%, S0.002%, Als0.022%, Ca0.0018%, surplus is Fe and impurity.
Further, slab tapping temperature is 1185 DEG C, and the heating of plate blank time is 336 minutes, 1175 DEG C of first stage start rolling temperatures, first stage high temperature extends the minimum single pass draft 13% of rolling, first stage roll speed 0.8m/s, subordinate phase open rolling thickness 100mm, 870 DEG C of subordinate phase start rolling temperatures, 810 DEG C of subordinate phase finishing temperatures, 670 DEG C of final cooling temperatures, subordinate phase rolling 6 passages, 8 DEG C/s of rate of cooling, is rolled into the steel plate that thickness is 40mm; The chemical composition of finished steel plate by weight percentage, comprising: C0.16%, Si0.29%, Mn1.45%, P0.009%, S0.003%, Ca0.0021%, Als0.024%, surplus is Fe and impurity.
Further, slab tapping temperature is 1178 DEG C, and the heating of plate blank time is 354 minutes, 1168 DEG C of first stage start rolling temperatures, first stage high temperature extends the minimum single pass draft 10% of rolling, first stage roll speed 0.8m/s, subordinate phase open rolling thickness 105mm, 870 DEG C of subordinate phase start rolling temperatures, 800 DEG C of subordinate phase finishing temperatures, 690 DEG C of final cooling temperatures, subordinate phase rolling 6 passages, 8 DEG C/s of rate of cooling, is rolled into the steel plate that thickness is 35mm; The chemical composition of finished steel plate by weight percentage, comprising: C0.17%, Si0.22%, Mn1.41%, P0.012%, S0.002%, Ca0.0023%, Als0.021%, 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, only uses cheap silicon, manganese as main alloying element, just can produce Q345R steel plate by suitable heating, controlled rolling, cooling control technology.Steel plate does not add the alloying element that Nb, V, Ti etc. are expensive, and production cost is low.
2, the intensity of steel plate, plasticity, toughness are good.The yield strength of steel plate is between 380MPa～420MPa, and tensile strength is between 525MPa～560MPa, and unit elongation is between 27.5%～31%, and 0 DEG C of ballistic work is between 150J～260J.
3, the composition of steel plate and technological design are reasonable, and process system is looser, can be on generous printed line stably manufactured.
4, with 1.5 ten thousand tons of Q345R steel plates that 10-40mm is thick of production in 1 year, 300 yuan of calculating of profit per ton.Within 1 year, can increase by 4,500,000 yuan of profits, there is good economic benefit.Production technique is simple simultaneously, less energy consumption, and fuel consumption is few, and environmental pollution is few, has positive social benefit.
Brief description of the drawings
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.
Embodiment
The present invention adopts low cost Composition Design, only uses cheap silicon, manganese as main alloying element, produces Q345R steel plate by suitable heating, controlled rolling, cooling control technology.
Low cost Q345R Plate Production method, specific as follows:
Step 1: smelt and continuous casting;
(1) molten iron adopts the desulfurization of magnesium base, adopts top bottom blowing in converter;
(2) molten steel, through the refining of LF stove, requires S≤0.003% in molten steel;
(3) molten steel carries out the processing of RH stove, is no more than the treatment time under 133Pa is not less than 21 minutes in vacuum tightness.
(4) thickness of continuously cast bloom is 250mm, adopts induction stirring and gently depress when continuous casting, and induction stirring frequency is 6Hz, electric current 272A, and depressing position is 6,7,8 sections, draught is 2mm, 2mm, 2mm.Adopt induction stirring and light Reduction Technology, object is to reduce steel plate center segregation, improves slab internal soundness.
The object of smelting is that the molten steel composition while ensureing to continuous casting meets the demands.
Step 2: for ensureing certain compression ratio and slab quality, adopt the thick continuously cast bloom (slab) of 250mm to produce, the tapping temperature 1170-1200 DEG C that slab reheats, 280～400 minutes heat-up times; The slab that 250mm is thick is exactly specification and model, and the slab of Wide and Thick Slab generally all defines by thickness, and general Wide and Thick Slab slab all only has several fixing specifications, as 200mm, 250mm, 300mm heavy slab.
Step 3: in the time of rolling 10mm～30mm Plate Steel, after reheating, carry out controlled rolling, first stage (rough rolling step) open rolling thickness is slab thickness, 1160～1190 DEG C of first stage start rolling temperatures, first stage roll speed is 1m/s, single pass draft >=10% when first stage high temperature extends rolling; The open rolling thickness of subordinate phase (finish rolling stage) steel plate is 3 times of finished steel plate thickness, and subordinate phase steel plate start rolling temperature is 880～980 DEG C, and subordinate phase finishing temperature is 790～820 DEG C, subordinate phase rolling 5～6 passages; Steel plate rolls after thermal straightening machine aligning, natural air cooling.
In the time that rolling is greater than 30mm～40mm Plate Steel, after reheating, carry out controlled rolling, first stage (rough rolling step) open rolling thickness is slab thickness, 1160～1190 DEG C of first stage start rolling temperatures, first stage roll speed is 0.8m/s, single pass draft >=12% when first stage high temperature extends rolling; The open rolling thickness of subordinate phase (finish rolling stage) steel plate is 2.5～3 times of finished steel plate thickness, and subordinate phase steel plate start rolling temperature is 870 DEG C, and subordinate phase finishing temperature is 800～810 DEG C, subordinate phase rolling 6 passages; After steel plate rolls, carry out laminar flow cooling, speed of cooling is 8 DEG C/s, and final cooling temperature is 670～690 DEG C.
The thickness of finished steel plate is 10～40mm, the chemical composition of low cost Q345R steel plate by weight percentage, comprising: C0.16～0.18%, Si0.2～0.3%, Mn1.3～1.5%, P≤0.02%, S≤0.005%, Ca0.0015～0.003%, Als (acid-soluble aluminium) 0.017～0.027%; All the other are iron and inevitable impurity.
In the situation that not adding the alloy such as Nb, V, for ensureing that steel plate has higher intensity and good plasticity, toughness, reply steel plate carries out controlled rolling, suitable controlled rolling strategy can fully be eliminated the casting flaw of slab inside, and abundant refine austenite crystal grain, finally obtain tiny ferrite crystal grain, to obtain the steel plate that comprehensive mechanical property is good.This steel grade is adopted to two-stage control rolling, and first stage controlled rolling belongs to the austenite recrystallization controlled rolling of high-temperature zone, and this one-phase adopts low speed, the rolling strategy depressed greatly.Large single pass draft can make distortion fully infiltrate into steel plate center, fully refine austenite crystal grain homogeneous austenite structure, the defects such as loose, the tiny crack of strand inside have been eliminated in the high temperature seam effect that simultaneously rolling produces to a great extent, and the density of steel plate is improved; Temperature when low speed rolling makes the complete temperature of every a time rolling lower than upper a time rolling, because the size of crystal grain after steel plate recrystallization depends primarily on temperature at that time, every like this rolling a time will be carried out refinement in various degree to crystal grain, finally reaches the object of abundant refine austenite crystal grain; While also having rolling, roll speed is low, and resistance to deformation is little, easily realizes larger single pass draft.
After first stage controlled rolling finishes, intermediate blank swings cooling on roller-way, cooling method is natural air cooling, be cooled to subordinate phase start rolling temperature and start rolling, during due to subordinate phase rolling, steel plate is thinner, temperature drop is very fast, every a time rolling is complete, the temperature of steel plate all can have decline by a relatively large margin, austenite crystal is by repeatedly broken, recrystallization softening, austenite crystal is finally on rolling refined basis of first stage like this, again by further refinement, and due to after subordinate phase rolls, finishing temperature is lower, austenite crystal is substantially no longer grown up, finally obtain tiny austenite crystal.Austenite crystal is more tiny, and its grain boundary area is larger, and the nucleation site by austenite during to ferritic transformation is just more, and nucleation rate is just higher, and the ferrite crystal grain finally obtaining is just more tiny, and the intensity of steel plate is higher, and impelling strength is better.For more than 30mm compared with Plate Steel, because natural air cooling speed of cooling is slower, therefore roll rear employing laminar flow cooling, steel plate is quickly cooled to 670～690 DEG C by finishing temperature, further reduce austenite to ferritic transition temperature, further refinement ferrite crystal grain, thereby improved the comprehensive mechanical property of steel plate.
Below in conjunction with embodiment, the invention will be further described.
Embodiment 1
Adopting thickness is 250mm slab, slab tapping temperature is 1170 DEG C, the heating of plate blank time is 280 minutes, (weight percent) chemical composition of slab is: C0.16%, Si0.3%, Mn1.3%, P0.02%, S0.003%, Als0.017%, Ca0.0015%, surplus is Fe and inevitable impurity.Be rolled into the steel plate that thickness is 30mm.Detailed rolling and the cold technique of going are in table 1, and its mechanical property is in table 2.Steel plate meets one-level flaw detection requirement.
As shown in Figure 1, be the metallographic structure figure of the steel plate of embodiment in the present invention 1.Can find out from this metallograph, steel plate be organized as ferrite+perlite, ferrite accounts for 80% left and right, the homogeneous grain size of steel plate, does not have mixed crystal phenomenon, because ferrite is in the great majority, and ferrite has good plasticity, toughness, therefore the steel plate of this tissue has good toughness.
Table 1 rolling and process for cooling
Table 2 mechanical property of steel plate
Embodiment 2
Adopting thickness is 250mm slab, slab tapping temperature is 1200 DEG C, the heating of plate blank time is 400 minutes, (weight percent) chemical composition of slab is: C0.18%, Si0.4%, Mn1.5%, P0.011%, S0.005%, Als0.027%, Ca0.0025%, surplus is Fe and inevitable impurity.Be rolled into the steel plate that thickness is 10mm, detailed rolling and the cold technique of going are in table 3, and its mechanical property is in table 4.Steel plate meets one-level flaw detection requirement.
As shown in Figure 2, be the metallographic structure figure of the steel plate of embodiment in the present invention 2.Can find out from this metallograph, steel plate be organized as ferrite+perlite, ferrite accounts for 80% left and right, the homogeneous grain size of steel plate through-thickness, there is no mixed crystal phenomenon, because ferrite is in the great majority, and ferrite has good plasticity, toughness, and therefore the steel plate of this tissue has good toughness.
Table 3 rolling and process for cooling
Table 4 mechanical property of steel plate
Embodiment 3
Adopting thickness is 250mm slab, slab tapping temperature is 1195 DEG C, the heating of plate blank time is 363 minutes, (weight percent) chemical composition of slab is: C0.17%, Si0.24%, Mn1.43%, P0.008%, S0.002%, Als0.022%, Ca0.0018%, surplus is Fe and inevitable impurity.Be rolled into the steel plate that thickness is 26mm, detailed rolling and the cold technique of going are in table 5, and its mechanical property is in table 6.Steel plate meets one-level flaw detection requirement.
As shown in Figure 3, be the metallographic structure figure of the steel plate of embodiment in the present invention 3.Can find out from this metallograph, steel plate be organized as ferrite+perlite, ferrite accounts for 80% left and right, the homogeneous grain size of steel plate through-thickness, there is no mixed crystal phenomenon, because ferrite is in the great majority, and ferrite has good plasticity, toughness, and therefore the steel plate of this tissue has good toughness.
Table 5 rolling and process for cooling
Table 6 mechanical property of steel plate
Embodiment 4
Adopting thickness is 250mm slab, slab tapping temperature is 1185 DEG C, the heating of plate blank time is 336 minutes, (weight percent) chemical composition of slab is: C0.16%, Si0.29%, Mn1.45%, P0.009%, S0.003%, Ca0.0021%, Als0.024%, surplus is Fe and inevitable impurity.Be rolled into the steel plate that thickness is 40mm, detailed rolling and the 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.Can find out from this metallograph, steel plate be organized as ferrite+perlite, ferrite is in the great majority, homogeneous grain size, does not have mixed crystal phenomenon, because ferrite is in the great majority, and ferrite has good plasticity, toughness, therefore the steel plate of this tissue has good toughness.
Table 7 rolling and process for cooling
Table 8 mechanical property of steel plate
Embodiment 5
Adopting thickness is 250mm slab, slab tapping temperature is 1178 DEG C, the heating of plate blank time is 354 minutes, (weight percent) chemical composition of slab is: C0.17%, Si0.22%, Mn1.41%, P0.012%, S0.002%, Ca0.0023%, Als0.021%, surplus is Fe and inevitable impurity.Be rolled into the steel plate that thickness is 35mm, detailed rolling and the 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.Can find out from this metallograph, steel plate be organized as ferrite+perlite, ferrite accounts for 80% left and right, the homogeneous grain size of steel plate through-thickness, there is no mixed crystal phenomenon, because ferrite is in the great majority, and ferrite has good plasticity, toughness, and therefore the steel plate of this tissue has good toughness.
Table 9 rolling and process for cooling
Table 10 mechanical property of steel plate
Claims (10)
1. a low cost Q345R steel plate, it is characterized in that, its chemical composition by weight percentage, comprising: C0.16～0.18%, Si0.2～0.3%, Mn1.3～1.5%, P≤0.02%, S≤0.005%, Ca0.0015～0.003%, Als0.017～0.027%; All the other are iron and impurity.
2. low cost Q345R steel plate as claimed in claim 1, it is characterized in that, its chemical composition by weight percentage, comprise: C0.16%, Si0.29%～0.3%, Mn1.3%～1.45%, P0.009%～0.02%, S0.003%, Als0.017%～0.024%, Ca0.0015%～0.0021%, surplus is Fe and impurity.
3. low cost Q345R steel plate as claimed in claim 1, it is characterized in that, its chemical composition by weight percentage, comprise: C0.17%, Si0.22%～0.24%, Mn1.41%～1.43%, P0.008%～0.012%, S0.002%, Als0.021%～0.022%, Ca0.0018%～0.0023%, surplus is Fe and impurity.
4. low cost Q345R steel plate as claimed in claim 1, it is characterized in that, its chemical composition by weight percentage, comprising: C0.18%, Si0.4%, Mn1.5%, P0.011%, S0.005%, Als0.027%, Ca0.0025%, surplus is Fe and impurity.
5. a production method for low cost Q345R steel plate, is characterized in that, step comprises that smelting, continuous casting, slab reheat; Wherein, slab reheats in process, adopts the thick continuously cast bloom of 250mm to produce, the tapping temperature 1170-1200 DEG C that slab reheats, 280～400 minutes heat-up times;
In the time of rolling 10mm～30mm Plate Steel, after reheating, carry out controlled rolling, first stage open rolling thickness is slab thickness, 1160～1190 DEG C of first stage start rolling temperatures, first stage roll speed is 1m/s, single pass draft >=10% when first stage high temperature extends rolling; 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 880～980 DEG C, and subordinate phase finishing temperature is 790～820 DEG C, subordinate phase rolling 5～6 passages; Steel plate rolls natural air cooling after thermal straightening machine aligning;
In the time that rolling is greater than 30mm～40mm Plate Steel, after reheating, carry out controlled rolling, first stage open rolling thickness is slab thickness, 1160～1190 DEG C of first stage start rolling temperatures, first stage roll speed is 0.8m/s, single pass draft >=12% when first stage high temperature extends rolling; The open rolling thickness of subordinate phase steel plate is 2.5～3 times of finished steel plate thickness, and subordinate phase steel plate start rolling temperature is 870 DEG C, and subordinate phase finishing temperature is 800～810 DEG C, subordinate phase rolling 6 passages; After steel plate rolls, carry out laminar flow cooling, speed of cooling is 8 DEG C/s, and final cooling temperature is 670～690 DEG C;
The chemical composition of finished steel plate by weight percentage, comprising: C0.16～0.18%, Si0.2～0.3%, Mn1.3～1.5%, P≤0.02%, S≤0.005%, Ca0.0015～0.003%, Als0.017～0.027%; All the other are iron and impurity.
6. the production method of low cost Q345R steel plate as claimed in claim 5, it is characterized in that, slab tapping temperature is 1170 DEG C, and the heating of plate blank time is 280 minutes, 1160 DEG C of first stage start rolling temperatures, first stage high temperature extends the minimum single pass draft 10% of rolling, first stage roll speed 1m/s, subordinate phase open rolling thickness 90mm, 880 DEG C of subordinate phase start rolling temperatures, 790 DEG C of subordinate phase finishing temperatures, subordinate phase rolling 6 passages, are rolled into the steel plate that thickness is 30mm; The chemical composition of finished steel plate by weight percentage, comprising: C0.16%, Si0.3%, Mn1.3%, P0.02%, S0.003%, Als0.017%, Ca0.0015%, surplus is Fe and impurity.
7. the production method of low cost Q345R steel plate as claimed in claim 5, it is characterized in that, slab tapping temperature is 1200 DEG C, and the heating of plate blank time is 400 minutes, 1190 DEG C of first stage start rolling temperatures, first stage high temperature extends the minimum single pass draft 15% of rolling, first stage roll speed 1m/s, subordinate phase open rolling thickness 30mm, 980 DEG C of subordinate phase start rolling temperatures, 820 DEG C of subordinate phase finishing temperatures, subordinate phase rolling 5 passages, are rolled into the steel plate that thickness is 10mm; The chemical composition of finished steel plate by weight percentage, comprising: C0.18%, Si0.4%, Mn1.5%, P0.011%, S0.005%, Als0.027%, Ca0.0025%, surplus is Fe and impurity.
8. the production method of low cost Q345R steel plate as claimed in claim 5, it is characterized in that, slab tapping temperature is 1195 DEG C, and the heating of plate blank time is 363 minutes, 1185 DEG C of first stage start rolling temperatures, first stage high temperature extends the minimum single pass draft 14% of rolling, first stage roll speed 1m/s, subordinate phase open rolling thickness 78mm, 890 DEG C of subordinate phase start rolling temperatures, 805 DEG C of subordinate phase finishing temperatures, subordinate phase rolling 6 passages, are rolled into the steel plate that thickness is 26mm; The chemical composition of finished steel plate by weight percentage, comprising: C0.17%, Si0.24%, Mn1.43%, P0.008%, S0.002%, Als0.022%, Ca0.0018%, surplus is Fe and impurity.
9. the production method of low cost Q345R steel plate as claimed in claim 5, it is characterized in that, slab tapping temperature is 1185 DEG C, the heating of plate blank time is 336 minutes, 1175 DEG C of first stage start rolling temperatures, first stage high temperature extends the minimum single pass draft 13% of rolling, first stage roll speed 0.8m/s, subordinate phase open rolling thickness 100mm, 870 DEG C of subordinate phase start rolling temperatures, 810 DEG C of subordinate phase finishing temperatures, 670 DEG C of final cooling temperatures, subordinate phase rolling 6 passages, 8 DEG C/s of rate of cooling, is rolled into the steel plate that thickness is 40mm; The chemical composition of finished steel plate by weight percentage, comprising: C0.16%, Si0.29%, Mn1.45%, P0.009%, S0.003%, Ca0.0021%, Als0.024%, surplus is Fe and impurity.
10. the production method of low cost Q345R steel plate as claimed in claim 5, it is characterized in that, slab tapping temperature is 1178 DEG C, the heating of plate blank time is 354 minutes, 1168 DEG C of first stage start rolling temperatures, first stage high temperature extends the minimum single pass draft 10% of rolling, first stage roll speed 0.8m/s, subordinate phase open rolling thickness 105mm, 870 DEG C of subordinate phase start rolling temperatures, 800 DEG C of subordinate phase finishing temperatures, 690 DEG C of final cooling temperatures, subordinate phase rolling 6 passages, 8 DEG C/s of rate of cooling, is rolled into the steel plate that thickness is 35mm; The chemical composition of finished steel plate by weight percentage, comprising: C0.17%, Si0.22%, Mn1.41%, P0.012%, S0.002%, Ca0.0023%, Als0.021%, surplus is Fe and impurity.
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| CN107177776A (en) * | 2017-05-05 | 2017-09-19 | 内蒙古包钢钢联股份有限公司 | Low-cost high-toughness thin specification steel plate and its production method |
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| CN111451277A (en) * | 2020-03-30 | 2020-07-28 | 包头钢铁（集团）有限责任公司 | X65 pipeline steel plate and plate shape control method thereof |
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| CN106917043A (en) * | 2017-02-17 | 2017-07-04 | 舞阳钢铁有限责任公司 | A kind of resisting sulfide stress corrosion cracking sheet metal and its production method |
| CN107177776A (en) * | 2017-05-05 | 2017-09-19 | 内蒙古包钢钢联股份有限公司 | Low-cost high-toughness thin specification steel plate and its production method |
| CN109576573A (en) * | 2018-11-19 | 2019-04-05 | 包头钢铁（集团）有限责任公司 | A kind of low cost Q345E thick steel plates and preparation method thereof |
| CN111069284A (en) * | 2020-01-03 | 2020-04-28 | 广东韶钢松山股份有限公司 | Steel plate rolling process and steel plate |
| CN111069284B (en) * | 2020-01-03 | 2021-04-02 | 广东韶钢松山股份有限公司 | Steel plate rolling process and steel plate |
| CN111440982A (en) * | 2020-03-30 | 2020-07-24 | 包头钢铁（集团）有限责任公司 | Q345B steel plate and production method thereof |
| CN111451277A (en) * | 2020-03-30 | 2020-07-28 | 包头钢铁（集团）有限责任公司 | X65 pipeline steel plate and plate shape control method thereof |
| CN111482459A (en) * | 2020-03-30 | 2020-08-04 | 包头钢铁（集团）有限责任公司 | X60 pipeline steel plate and plate shape control method thereof |
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