CN104018064B - The production method of low cost Q345R steel plate - Google Patents
The production method of low cost Q345R steel plate Download PDFInfo
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Abstract
The invention discloses a kind of low cost Q345R steel plate, its chemical composition by weight percentage, including 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%；Remaining is ferrum and impurity.The invention also discloses the production method of a kind of low cost Q345R steel plate.The present invention just can produce Q345R steel plate by suitably heating, controlled rolling, the cold technique of control, and steel plate is without the alloying element of the costlinesses such as Nb, V, Ti, and production cost is low.
Description
Technical field
Originally the invention belongs to material processing field, specifically, relate to the life of a kind of low cost Q345R steel plate
Product method.
Background technology
Application number 201210182417.5, title the invention discloses a kind of steel plate for heavy-gauge pressure vessel
And preparation method thereof, its chemical composition of steel plate for heavy-gauge pressure vessel is by the group of following percentage by weight
Melting is divided to form: 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 structrure.The Design of Chemical Composition of the steel plate of the present invention uses cheap
Carbon, manganese solution strengthening, add a small amount of alloying element, by after normalizing water-cooled accelerate cooling obtain steel
Plate.
Q345R steel plate is the main material producing pressure vessel, is widely used in various pressure vessel
Produce, as the device fabrications such as pressure gas tank, gas cylinder, reactor will use Q345R steel plate.Q345R
Steel plate has higher intensity, good plasticity, toughness.For ensureing intensity and the toughness of Q345R steel plate,
Typically all can add the microalloies such as Nb, V when producing, Nb, the membership that adds of V alloy make steel plate cost
It is significantly increased；And after adding Nb in Q345R steel plate, slab easily cracks when casting, right
Slab carries out removing surface, can be greatly increased workman's amount of labour, 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, 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, including: C 0.16～
0.18%, Si 0.2～0.3%, Mn 1.3～1.5%, P≤0.02%, S≤0.005%, Ca 0.0015～
0.003%, Als 0.017～0.027%；Remaining is ferrum and impurity.
Further, its chemical composition by weight percentage, including: C 0.16%, Si 0.29%～0.3%,
Mn 1.3%～1.45%, P 0.009%～0.02%, S 0.003%, Als 0.017%～0.024%, Ca
0.0015%～0.0021%, surplus is Fe and impurity.
Further, its chemical composition by weight percentage, including: C 0.17%, Si 0.22%～0.24%,
Mn 1.41%～1.43%, P 0.008%～0.012%, S 0.002%, Als 0.021%～0.022%,
Ca 0.0018%～0.0023%, surplus is Fe and impurity.
Further, its chemical composition by weight percentage, including: C 0.18%, Si 0.4%, Mn 1.5%,
P 0.011%, S 0.005%, Als 0.027%, Ca 0.0025%, surplus is Fe and impurity.
Another technical problem solved by the invention is to provide the production of a kind of low cost Q345R steel plate
Method, just can produce Q345R steel plate by suitably heating, controlled rolling, the cold technique of control, and steel plate is not
Adding the expensive alloying element such as Nb, V, Ti, production cost is low.
Technical scheme is as follows:
The production method of a kind of low cost Q345R steel plate, step includes that smelting, continuous casting, slab reheat；
Wherein, during slab reheats, using continuous casting billet thick for 250mm to produce, slab reheats
Tapping temperature 1170-1200 DEG C, heat time heating time 280～400 minutes；
When rolling 10mm～30mm steel plate, after reheating, it is controlled rolling, first stage
Open rolling thickness is slab thickness, first stage start rolling temperature 1160～1190 DEG C, first stage mill speed
For 1m/s, single pass reduction ratio >=10% when first stage high temperature extends rolling；Opening of second stage steel plate
Rolling thickness is 3 times of finished steel plate thickness, and second stage steel plate start rolling temperature is 880～980 DEG C, second-order
Section finishing temperature is 790～820 DEG C, second stage rolling 5～6 passages；Steel plate rolls through thermal straightening machine
Natural air cooling after aligning；
When rolling is more than 30mm～40mm steel plate, it is controlled after reheating rolling, first
Stage open rolling thickness is slab thickness, first stage start rolling temperature 1160～1190 DEG C, and the first stage rolls
Speed is 0.8m/s, single pass reduction ratio >=12% when first stage high temperature extends rolling；Second stage steel
The open rolling thickness of plate is 2.5～3 times of finished steel plate thickness, and second stage steel plate start rolling temperature is 870 DEG C,
Second stage finishing temperature is 800～810 DEG C, and second stage rolls 6 passages；Steel plate carries out layer after rolling
Stream cooling, rate 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, including: C 0.16～0.18%, Si 0.2～
0.3%, Mn 1.3～1.5%, P≤0.02%, S≤0.005%, Ca 0.0015～0.003%, Als 0.017～
0.027%；Remaining is ferrum and impurity.
Further, slab tapping temperature is 1170 DEG C, and slab heating time is 280 minutes, the first stage
Start rolling temperature 1160 DEG C, first stage high temperature extends the minimum single pass reduction ratio 10% of rolling, first stage
Mill speed 1m/s, second stage open rolling thickness 90mm, second stage start rolling temperature 880 DEG C, second
Stage finishing temperature 790 DEG C, second stage rolls 6 passages, is rolled into the steel plate that thickness is 30mm；
The chemical composition of finished steel plate by weight percentage, including: C 0.16%, Si 0.3%, Mn 1.3%,
P 0.02%, S 0.003%, Als 0.017%, Ca 0.0015%, surplus is Fe and impurity.
Further, slab tapping temperature is 1200 DEG C, and slab heating time is 400 minutes, the first stage
Start rolling temperature 1190 DEG C, first stage high temperature extends the minimum single pass reduction ratio 15% of rolling, first stage
Mill speed 1m/s, second stage open rolling thickness 30mm, second stage start rolling temperature 980 DEG C, second
Stage finishing temperature 820 DEG C, second stage rolls 5 passages, is rolled into the steel plate that thickness is 10mm；
The chemical composition of finished steel plate by weight percentage, including: C 0.18%, Si 0.4%, Mn 1.5%,
P 0.011%, S 0.005%, Als 0.027%, Ca 0.0025%, surplus is Fe and impurity.
Further, slab tapping temperature is 1195 DEG C, and slab heating time is 363 minutes, the first stage
Start rolling temperature 1185 DEG C, first stage high temperature extends the minimum single pass reduction ratio 14% of rolling, first stage
Mill speed 1m/s, second stage open rolling thickness 78mm, second stage start rolling temperature 890 DEG C, second
Stage finishing temperature 805 DEG C, second stage rolls 6 passages, is rolled into the steel plate that thickness is 26mm；
The chemical composition of finished steel plate by weight percentage, including: C 0.17%, Si 0.24%, Mn 1.43%,
P 0.008%, S 0.002%, Als 0.022%, Ca 0.0018%, surplus is Fe and impurity.
Further, slab tapping temperature is 1185 DEG C, and slab heating time is 336 minutes, the first stage
Start rolling temperature 1175 DEG C, first stage high temperature extends the minimum single pass reduction ratio 13% of rolling, first stage
Mill speed 0.8m/s, second stage open rolling thickness 100mm, second stage start rolling temperature 870 DEG C, the
Two-stage finishing temperature 810 DEG C, final cooling temperature 670 DEG C, second stage rolls 6 passages, cooldown rate 8 DEG C
/ s, is rolled into the steel plate that thickness is 40mm；The chemical composition of finished steel plate by weight percentage, is wrapped
Include: C 0.16%, Si 0.29%, Mn 1.45%, P 0.009%, S 0.003%, Ca 0.0021%, Als
0.024%, surplus is Fe and impurity.
Further, slab tapping temperature is 1178 DEG C, and slab heating time is 354 minutes, the first stage
Start rolling temperature 1168 DEG C, first stage high temperature extends the minimum single pass reduction ratio 10% of rolling, first stage
Mill speed 0.8m/s, second stage open rolling thickness 105mm, second stage start rolling temperature 870 DEG C, the
Two-stage finishing temperature 800 DEG C, final cooling temperature 690 DEG C, second stage rolls 6 passages, cooldown rate 8 DEG C
/ s, is rolled into the steel plate that thickness is 35mm；The chemical composition of finished steel plate by weight percentage, is wrapped
Include: C 0.17%, Si 0.22%, Mn 1.41%, P 0.012%, S 0.002%, Ca 0.0023%, Als
0.021%, surplus is Fe and impurity.
Compared with prior art, the technology of the present invention effect includes:
1, the present invention uses low cost composition to design, and only uses cheap silicon, manganese as main alloy unit
Element, just can produce Q345R steel plate by suitably heating, controlled rolling, the cold technique of control.Steel plate does not adds
Adding the expensive alloying element such as Nb, V, Ti, production cost is low.
2, the intensity of steel plate, plasticity, toughness are good.The yield strength of steel plate is at 380MPa～420MPa
Between, tensile strength between 525MPa～560MPa, elongation percentage between 27.5%～31%, 0 DEG C
Ballistic work is between 150J～260J.
3, composition and the technological design of steel plate are reasonable, and process system is more relaxed, can be steady on generous printed line
Fixed production.
4, the thick Q345R steel plate of 1.5 ten thousand tons of 10-40mm, profit per ton 300 yuan meter were produced with 1 year
Calculate.Profit 4,500,000 yuan within 1 year, can be increased, there is good economic benefit.Production technology is simple simultaneously,
Less energy consumption, fuel consumption is few, and environmental pollution 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.
Detailed description of the invention
The present invention uses low cost composition to design, only use cheap silicon, manganese as main alloying element,
Q345R steel plate is produced by suitably heating, controlled rolling, the cold technique of control.
Low cost Q345R Plate Production method, specific as follows:
Step 1: smelt and continuous casting；
(1) molten iron uses Mg-basic desulphuration, uses top bottom blowing in converter；
(2) molten steel is through LF stove refine, it is desirable to S≤0.003% in molten steel；
(3) molten steel carries out RH stove process, and the time that processes under vacuum is less than 133Pa is not less than
21 minutes.
(4) thickness of continuous casting billet is 250mm, uses electromagnetic agitation and slighter compress during continuous casting, and electromagnetism stirs
Mixing frequency is 6Hz, electric current 272A, and depressing position is 6,7,8 sections, drafts is 2mm, 2mm,
2mm.Use electromagnetic agitation and soft reduction technique, it is therefore an objective to reduce steel plate center segregation, improve in slab
Portion's quality.
The molten steel composition when purpose smelted is to ensure that continuous casting meets requirement.
Step 2: for ensureing certain compression ratio and slab quality, use continuous casting billet (plate thick for 250mm
Base) produce, tapping temperature 1170-1200 DEG C that slab reheats, heat time heating time 280～400 points
Clock；Slab thick for 250mm is exactly specification and model, and the slab of Wide and Thick Slab is typically all and defines by thickness
, general Wide and Thick Slab slab all only has several fixing specification, such as 200mm, 250mm, 300mm
Heavy slab.
Step 3: when rolling 10mm～30mm steel plate, is controlled rolling after reheating, the
One stage (rough rolling step) open rolling thickness is slab thickness, first stage start rolling temperature 1160～1190 DEG C,
First stage mill speed is 1m/s, single pass reduction ratio >=10% when first stage high temperature extends rolling；
The open rolling thickness of second stage (finish rolling stage) steel plate is 3 times of finished steel plate thickness, second stage steel plate
Start rolling temperature is 880～980 DEG C, and second stage finishing temperature is 790～820 DEG C, second stage rolling 5～
6 passages；Steel plate rolls after thermal straightening machine is aligned, natural air cooling.
When rolling is more than 30mm～40mm steel plate, it is controlled after reheating rolling, first
Stage (rough rolling step) open rolling thickness is slab thickness, first stage start rolling temperature 1160～1190 DEG C,
First stage mill speed is 0.8m/s, single pass reduction ratio >=12% when first stage high temperature extends rolling；
The open rolling thickness of second stage (finish rolling stage) steel plate is 2.5～3 times of finished steel plate thickness, second stage
Steel plate start rolling temperature is 870 DEG C, and second stage finishing temperature is 800～810 DEG C, second stage rolling 6
Passage；Steel plate carries out section cooling after rolling, and rate 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 hundred
Proportion by subtraction meter, including: C 0.16～0.18%, Si 0.2～0.3%, Mn 1.3～1.5%, P≤0.02%,
S≤0.005%, Ca 0.0015～0.003%, Als (dissolved aluminum) 0.017～0.027%；Remaining is ferrum
With inevitable impurity.
In the case of without alloys such as Nb, V, for ensureing that steel plate has higher intensity and good
Plasticity, toughness, reply steel plate is controlled rolling, and suitable controlled rolling strategy can fully eliminate slab
Internal casting flaw, and fully fining austenite grains, finally give tiny ferrite crystal grain, with
Obtain the steel plate that comprehensive mechanical property is good.This steel grade uses two-stage control rolling, and the first stage is controlled
System rolling belongs to the austenite recrystallization controlled rolling of high-temperature region, and this stage uses low speed, greatly pressure
Rolling strategy.Big single pass reduction ratio can make deformation fully infiltrate into steel plate center, fully refines Ovshinsky
Body crystal grain homogeneous austenite structure, the high temperature seam effect simultaneously rolling generation largely eliminates
The defects such as loose, the micro-crack within strand, make the consistency of steel plate improve；Low speed rolling makes every one
Temperature when the complete temperature of secondary rolling rolls less than upper a time, due to the size of crystal grain after steel plate recrystallization
Depending primarily on temperature at that time, the most often crystal grain will be refined by rolling a time in various degree,
It is finally reached the purpose of abundant fining austenite grains；When also having rolling, mill speed is low, and resistance of deformation is little,
Easily realize bigger single pass reduction ratio.
After first stage controlled rolling terminates, intermediate blank swings cooling on roller-way, and cooling method is natural air cooling,
Being cooled to second stage start rolling temperature and start rolling, when rolling due to second stage, steel plate is relatively thin, temperature drop
Comparatively fast, each passes is complete, and the temperature of steel plate all can have decline by a relatively large margin, austenite crystal quilt
Broken, recrystallization softening repeatedly, such austenite crystal finally on the basis of the first stage is rolling refined,
Again it is further refined, and after rolling due to second stage, finishing temperature is relatively low, austenite crystal base
This is no longer grown up, and finally gives tiny austenite crystal.Austenite crystal is the most tiny, its grain boundary area
The biggest, by austenite to ferritic transformation time nucleation site the most, nucleation rate is the highest, final
The ferrite crystal grain arrived is the most tiny, and the intensity of steel plate is the highest, and impact flexibility is the best.For 30mm with
On relatively steel plate, owing to natural air cooling rate of cooling is relatively slow, use section cooling after therefore rolling, by steel
Plate is quickly cooled to 670～690 DEG C by finishing temperature, reduce further austenite to ferritic transformation
Temperature, has refined ferrite crystal grain further, thus has improve the comprehensive mechanical property of steel plate.
Below in conjunction with embodiment, the invention will be further described.
Embodiment 1
Using thickness is 250mm slab, and slab tapping temperature is 1170 DEG C, and slab heating time is 280
Minute, (percentage by weight) chemical composition of slab is: C 0.16%, Si 0.3%, Mn 1.3%, P 0.02%,
S 0.003%, Als 0.017%, Ca 0.0015%, surplus is Fe and inevitable impurity.It is rolled into
Thickness is the steel plate of 30mm.Detailed rolling and cold go technique to be shown in Table 1, its mechanical property is shown in Table 2.
Steel plate meets one-level flaw detection requirement.
As it is shown in figure 1, be the metallographic structure figure of the steel plate of embodiment 1 in the present invention.Can from this metallograph
To find out, steel plate be organized as ferrite+pearlite, ferrite accounts for about 80%, and the crystal grain of steel plate is big
Little uniformly do not have mixed crystal phenomenon, owing to ferrite is in the great majority, and ferrite have good plasticity,
Toughness, therefore the steel plate of this tissue has good toughness.
Table 1 rolls and cools down technique
Table 2 mechanical property of steel plate
Embodiment 2
Using thickness is 250mm slab, and slab tapping temperature is 1200 DEG C, and slab heating time is 400
Minute, (percentage by weight) chemical composition of slab is: C 0.18%, Si 0.4%, Mn 1.5%, P
0.011%, S 0.005%, Als 0.027%, Ca 0.0025%, surplus is Fe and inevitable impurity.
Being rolled into the steel plate that thickness is 10mm, detailed rolling and cold go technique to be shown in Table 3, its mechanical property is shown in
Table 4.Steel plate meets one-level flaw detection requirement.
As in figure 2 it is shown, be the metallographic structure figure of the steel plate of embodiment 2 in the present invention.Can from this metallograph
To find out, steel plate be organized as ferrite+pearlite, ferrite accounts for about 80%, and steel plate is along thickness side
To homogeneous grain size, there is no mixed crystal phenomenon, owing to ferrite is in the great majority, and ferrite has good
Plasticity well, toughness, therefore the steel plate of this tissue has good toughness.
Table 3 rolls and cools down technique
Table 4 mechanical property of steel plate
Embodiment 3
Using thickness is 250mm slab, and slab tapping temperature is 1195 DEG C, and slab heating time is 363
Minute, (percentage by weight) chemical composition of slab is: C 0.17%, Si 0.24%, Mn 1.43%,
P 0.008%, S 0.002%, Als 0.022%, Ca 0.0018%, surplus is Fe and the most miscellaneous
Matter.It is rolled into the steel plate that thickness is 26mm, detailed rolling and cold go technique to be shown in Table 5, its mechanical property
6 can be shown in Table.Steel plate meets one-level flaw detection requirement.
As it is shown on figure 3, be the metallographic structure figure of the steel plate of embodiment 3 in the present invention.Can from this metallograph
To find out, steel plate be organized as ferrite+pearlite, ferrite accounts for about 80%, and steel plate is along thickness side
To homogeneous grain size, there is no mixed crystal phenomenon, owing to ferrite is in the great majority, and ferrite has good
Plasticity well, toughness, therefore the steel plate of this tissue has good toughness.
Table 5 rolls and cools down technique
Table 6 mechanical property of steel plate
Embodiment 4
Using thickness is 250mm slab, and slab tapping temperature is 1185 DEG C, and slab heating time is 336
Minute, (percentage by weight) chemical composition of slab is: C 0.16%, Si 0.29%, Mn 1.45%,
P 0.009%, S 0.003%, Ca 0.0021%, Als 0.024%, surplus is Fe and the most miscellaneous
Matter.It is rolled into the steel plate that thickness is 40mm, detailed rolling and cold go technique to be shown in Table 7, its mechanical property
8 can be shown in Table.
As shown in Figure 4, for the metallographic structure figure of steel plate of embodiment in the present invention 4.Can from this metallograph
To find out, steel plate be organized as ferrite+pearlite, ferrite is in the great majority, homogeneous grain size,
Not having mixed crystal phenomenon, owing to ferrite is in the great majority, and ferrite has good plasticity, toughness, because of
The steel plate of this this tissue has good toughness.
Table 7 rolls and cools down technique
Table 8 mechanical property of steel plate
Embodiment 5
Using thickness is 250mm slab, and slab tapping temperature is 1178 DEG C, and slab heating time is 354
Minute, (percentage by weight) chemical composition of slab is: C 0.17%, Si 0.22%, Mn 1.41%,
P 0.012%, S 0.002%, Ca 0.0023%, Als 0.021%, surplus is Fe and the most miscellaneous
Matter.It is rolled into the steel plate that thickness is 35mm, detailed rolling and cold go technique to be shown in Table 9, its mechanical property
10 can be shown in Table.
As it is shown in figure 5, be the metallographic structure figure of the steel plate of embodiment 5 in the present invention.Can from this metallograph
To find out, steel plate be organized as ferrite+pearlite, ferrite accounts for about 80%, and steel plate is along thickness side
To homogeneous grain size, there is no mixed crystal phenomenon, owing to ferrite is in the great majority, and ferrite has good
Plasticity well, toughness, therefore the steel plate of this tissue has good toughness.
Table 9 rolls and cools down technique
Table 10 mechanical property of steel plate
Claims (6)
1. the production method of a low cost Q345R steel plate, it is characterised in that step include smelt,
Continuous casting, slab reheat；Wherein, during slab reheats, continuous casting billet thick for 250mm is used to enter
Row produces, tapping temperature 1170-1200 DEG C that slab reheats, heat time heating time 280～400 minutes；
When rolling 10mm～30mm steel plate, after reheating, it is controlled rolling, first stage
Open rolling thickness is slab thickness, first stage start rolling temperature 1160～1190 DEG C, first stage mill speed
For 1m/s, single pass reduction ratio >=10% when first stage high temperature extends rolling；Opening of second stage steel plate
Rolling thickness is 3 times of finished steel plate thickness, and second stage steel plate start rolling temperature is 880～980 DEG C, second-order
Section finishing temperature is 790～820 DEG C, second stage rolling 5～6 passages；Steel plate rolls through thermal straightening machine
Natural air cooling after aligning；
When rolling is more than 30mm～40mm steel plate, it is controlled after reheating rolling, first
Stage open rolling thickness is slab thickness, first stage start rolling temperature 1160～1190 DEG C, and the first stage rolls
Speed is 0.8m/s, single pass reduction ratio >=12% when first stage high temperature extends rolling；Second stage steel
The open rolling thickness of plate is 2.5～3 times of finished steel plate thickness, and second stage steel plate start rolling temperature is 870 DEG C,
Second stage finishing temperature is 800～810 DEG C, and second stage rolls 6 passages；Steel plate carries out layer after rolling
Stream cooling, rate 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, including: C 0.16～0.18%, Si 0.2～
0.3%, Mn 1.3～1.5%, P≤0.02%, S≤0.005%, Ca 0.0015～0.003%, Als 0.017～
0.027%；Remaining is ferrum and impurity.
2. the production method of low cost Q345R steel plate as claimed in claim 1, it is characterised in that plate
Base tapping temperature is 1170 DEG C, and slab heating time is 280 minutes, first stage start rolling temperature 1160 DEG C,
The minimum single pass reduction ratio 10% of first stage high temperature extension rolling, first stage mill speed 1m/s, the
Two-stage open rolling thickness 90mm, second stage start rolling temperature 880 DEG C, second stage finishing temperature 790 DEG C,
Second stage rolls 6 passages, is rolled into the steel plate that thickness is 30mm；The chemical composition of finished steel plate is pressed
Percentage by weight meter, including: C 0.16%, Si 0.3%, Mn 1.3%, P 0.02%, S 0.003%,
Als 0.017%, Ca 0.0015%, surplus is Fe and impurity.
3. the production method of low cost Q345R steel plate as claimed in claim 1, it is characterised in that plate
Base tapping temperature is 1200 DEG C, and slab heating time is 400 minutes, first stage start rolling temperature 1190 DEG C,
The minimum single pass reduction ratio 15% of first stage high temperature extension rolling, first stage mill speed 1m/s, the
Two-stage open rolling thickness 30mm, second stage start rolling temperature 980 DEG C, second stage finishing temperature 820 DEG C,
Second stage rolls 5 passages, is rolled into the steel plate that thickness is 10mm；The chemical composition of finished steel plate is pressed
Percentage by weight meter, including: C 0.18%, Si 0.4%, Mn 1.5%, P 0.011%, S 0.005%,
Als 0.027%, Ca 0.0025%, surplus is Fe and impurity.
4. the production method of low cost Q345R steel plate as claimed in claim 1, it is characterised in that plate
Base tapping temperature is 1195 DEG C, and slab heating time is 363 minutes, first stage start rolling temperature 1185 DEG C,
The minimum single pass reduction ratio 14% of first stage high temperature extension rolling, first stage mill speed 1m/s, the
Two-stage open rolling thickness 78mm, second stage start rolling temperature 890 DEG C, second stage finishing temperature 805 DEG C,
Second stage rolls 6 passages, is rolled into the steel plate that thickness is 26mm；The chemical composition of finished steel plate is pressed
Percentage by weight meter, including: C 0.17%, Si 0.24%, Mn 1.43%, P 0.008%, S 0.002%,
Als 0.022%, Ca 0.0018%, surplus is Fe and impurity.
5. the production method of low cost Q345R steel plate as claimed in claim 1, it is characterised in that plate
Base tapping temperature is 1185 DEG C, and slab heating time is 336 minutes, first stage start rolling temperature 1175 DEG C,
The minimum single pass reduction ratio 13% of first stage high temperature extension rolling, first stage mill speed 0.8m/s,
Second stage open rolling thickness 100mm, second stage start rolling temperature 870 DEG C, second stage finishing temperature
810 DEG C, final cooling temperature 670 DEG C, second stage rolls 6 passages, 8 DEG C/s of cooldown rate, is rolled into thickness
Degree is the steel plate of 40mm；The chemical composition of finished steel plate by weight percentage, including: C 0.16%,
Si 0.29%, Mn 1.45%, P 0.009%, S 0.003%, Ca 0.0021%, Als 0.024%, surplus
For Fe and impurity.
6. the production method of low cost Q345R steel plate as claimed in claim 1, it is characterised in that plate
Base tapping temperature is 1178 DEG C, and slab heating time is 354 minutes, first stage start rolling temperature 1168 DEG C,
The minimum single pass reduction ratio 10% of first stage high temperature extension rolling, first stage mill speed 0.8m/s,
Second stage open rolling thickness 105mm, second stage start rolling temperature 870 DEG C, second stage finishing temperature
800 DEG C, final cooling temperature 690 DEG C, second stage rolls 6 passages, 8 DEG C/s of cooldown rate, is rolled into thickness
Degree is the steel plate of 35mm；The chemical composition of finished steel plate by weight percentage, including: C 0.17%,
Si 0.22%, Mn 1.41%, P 0.012%, S 0.002%, Ca 0.0023%, Als 0.021%, surplus
For Fe and impurity.
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| CN105219940B (en) * | 2015-10-09 | 2017-09-22 | 天津钢铁集团有限公司 | A kind of production technology for ensureing medium plate Z-direction properties percent of pass |
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