CN110331345A - 600MPa grades of low yield strength ratio high-performance building steel plates and its production method - Google Patents
600MPa grades of low yield strength ratio high-performance building steel plates and its production method Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/06—Deoxidising, e.g. killing
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/10—Handling in a vacuum
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/002—Bainite
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
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- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
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- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
The invention discloses a kind of 600MPa grades of low yield strength ratio high-performance building steel and its production method, the chemical components of the construction(al)steel are as follows: C, Si, Mn, Als, S, P, Cr, Ni, Cu, Nb, Ti, remaining is Fe and inevitable impurity；The technological process of production of the steel plate are as follows: molten iron pretreatment → converter → LF refining → RH application of vacuum → slab slow cooling → rolling → steel plate heap is cold → examine storage.Present invention process process is short, and steel plate removes heat treatment procedure from the delivery of TMCP state, at low cost, and the steel plate has high intensity, low yield strength ratio, antidetonation, excellent corrosion resistance etc., and product has high added value.
Description
Technical field
The invention belongs to metallurgical manufacturing fields, and in particular to a kind of 600MPa grades of low yield strength ratio high-performance building steel plate and
Its production method.
Background technique
Cut deal product is widely used in high building structure, bridge, boilers and pressure vessel and its Marine engineering.Currently,
Steel building has been widely used in workshop building, civil buildings and public building, in the prior art, equipment condition
Under, high-performance building steel is developed, it is made to play the hot spot that bigger effect is current building trade concern in economic development
Problem.
Currently, steel building is widely popularized at home, but it uses steel grade substantially based on 345 intensity ranks, part
If Bird's Nest, Hangzhou Asian Games main venue have used 460 intensity ranks, 500GJ also never by engineer application, use by high-strength building structure
Steel requires lower yield tensile ratio, has overload-resistant, anti-seismic performance and corrosion resistance.
Q500GJ, Q550GJ are included in this specification for the first time by GB/T 19879-2015 new edition, in the near future, high-strength to build
Building will can be applied in terms of long span building engineering with steel.Currently, the Q500GJE of correlation intensity is mainly handed over quenched and tempered state
Goods, compared with TMCP state, due to increasing heat treatment procedure, process is increasingly complex, and production cost is higher.Bulletin
The invention " a kind of Q500GJD quenched and tempered state cast structure steel plate and its manufacturing method " of CN201710685006, it and it is of the invention
Q500GJE the difference is that: (1) be it is complicated using quenched and tempered state production technology, long flow path is heat-treated at high cost；(2) impact etc.
Grade is D grades, can not be applied under -40 DEG C of environment；(3) do not have excellent corrosion resisting property, needed in steel construction processing use process
Do corrosion-inhibiting coating processing.
Summary of the invention
The purpose of the present invention is develop a kind of 600MPa grades to have low yield strength ratio, corrosion resistance, low-temperature flexibility contour additional
The high-performance building structure that value is integrated Q500GJE steel and its low cost, the production method of short route.
The technical solution used in the present invention is:
A kind of 600MPa grades of low yield strength ratio high-performance building steel, the chemical component of the steel plate is C by mass percentage:
0.08~0.12, Si:0.20~0.30, Mn:1.40~1.60, Als:0.020~0.035, S≤0.010, P≤0.012, Cr:
0.30~0.50, Ni:0.17~0.22, Cu:0.25~0.32, Nb:0.020~0.040, Ti:0.015~0.025, remaining is
Fe and inevitable impurity；Its trade mark is Q500GJE, and the condition of delivery is TMCP state.Als is dissolved aluminum.
20~40mm of building sheet thickness of the present invention, organization type are the acicular ferrite+island bainite+M-A structure
At line and staff control, and the island M-A organize area percent≤2%.550~580MPa of its yield strength, tensile strength 680~
720MPa, elongation >=20%；Yield tensile ratio≤0.85, -40 DEG C of ballistic works are more than or equal to 120J, value >=6.0 corrosion resistance index I.
The production method of steel plate of the present invention, including following process: molten iron pretreatment → converter → LF refining → RH is true
Vacancy reason → slab slow cooling → rolling → steel plate heap is cold → examine storage.
Further, converter procedure of the present invention, is smelted using top and bottom complex blowing, converter terminal C≤0.06%, [C%]
[O%] concentration product≤0.0024%, tapping process use the strong deoxidation of Al, and whole Argon stirring promotes deoxidation products floating removal.
Further, LF refining and RH application of vacuum process of the present invention, using LF+RH duplex refining treatment, molten steel
Temperature >=1580 DEG C, total oxygen are less than 25ppm, hydrogen content≤2ppm, and the soft blow time >=10min carries out after RH vacuum breaker feeding at calcium
Reason, to Al2O3Type impurity carries out Metamorphism treatment.
Further, slab slow cooling operation of the present invention, use Slab Caster production casting blank cross-section size for
280*1800mm, 0.85~0.95m/min of casting machine pulling rate stability contorting；Using electromagnetic agitation, slab equiaxial crystal ratio is improved, is used
30mm technique under the stagnation pressure of casting blank solidification forward position promotes slab consistency, is effectively improved inherent quality, the offline slow cooling of slab；
Further, rolling process of the present invention, blank heating is to 1200 DEG C, in furnace duration >=250min, using heating furnace
Fast burning+high pressure water dephosphorization, effectively solves the problems, such as that copper bearing steel dephosphorization is not clean, plate surface quality is excellent；
Using roughing+finish rolling Stand Mill rolling, roughing start rolling temperature >=1020 DEG C, rough rolling step uses heavy reduction, guarantees thick
It rolls single pass rolling reduction >=25mm, guarantees the ferrite crystal grain for obtaining fine uniform, to temperature thickness according to 2~3 times of finished product thicknesses,
Steel speed 1m/s is thrown in finish rolling finishing temperature≤800 DEG C；
Further, steel plate heap cooling working procedure of the present invention rolls rear relaxation time 15s, using cold water-spraying control, opens cold temperature
750 DEG C~780 DEG C, final cooling temperature≤650 DEG C.
Further, inspection of the present invention is put in storage process, is covered using high temperature resistant tarpaulin, the hydrogen being released effectively in steel,
Slow cooling 36 hours, ultrasonic examination grade reached I grades, storage.
Beneficial effects of the present invention:
Process flow of the present invention is short, at low cost, and steel plate has low yield strength ratio antidetonation, superior low-temperature toughness and corrosion-resistant height additional
Value.
Detailed description of the invention
Fig. 1 is the steel plate metallographic structure figure of the embodiment of the present invention 1.
Specific embodiment
Present invention is further described in detail with reference to embodiments.
Embodiment 1
A kind of 600MPa grades of low yield strength ratio high-performance building steel and its production method are as described below.
Steel grade number is Q500GJE, steel plate thickness 20mm in this production.
The technological process of production of this thickness steel plate are as follows: molten iron pretreatment → converter → LF refining → RH application of vacuum → slab
Slow cooling → rolling → steel plate heap is cold → examine storage.
The 20mm thickness Q500GJE chemical component is calculated as according to mass percent: C:0.12, Si:0.20, Mn:1.60,
Als:0.025, S:0.002, P:0.010, Cr:0.30, Ni:0.20, Cu:0.30, Nb:0.025, Ti:0.018, remaining is Fe
And inevitable impurity.
Converter procedure of the present invention, is smelted using top and bottom complex blowing, converter terminal C=0.06%, [C%] [O%] concentration product
0.0022%, tapping process uses the strong deoxidation of Al, and whole Argon stirs 30min, promotes deoxidation products to float and removes；
Refining procedure of the present invention, using LF+RH duplex refining treatment, effective control composition meets 20mm Q500GJE requirement
And 1580 DEG C of liquid steel temperature, total oxygen 23ppm after RH application of vacuum, hydrogen content 2ppm, soft blow time 15min, RH vacuum breaker is laggard
Row feeds Calcium treatment, and calcium content reaches 20ppm in steel, to Al2O3Type impurity carries out Metamorphism treatment；
Continuous casting working procedure of the present invention uses Slab Caster production casting blank cross-section size for 280*1800mm, and casting machine is drawn
Fast stability contorting 0.85m/min；Using electromagnetic agitation, electric current 400A, frequency 5Hz effectively improve slab equiaxial crystal ratio, using casting
30mm technique under base solidification front stagnation pressure promotes slab consistency, is effectively improved inherent quality；
Heating process of the present invention, blank heating is to 1200 DEG C, in furnace duration 255min, using heating furnace burning+high pressure water fastly
Dephosphorization >=20MPa effectively solves the problems, such as that copper bearing steel dephosphorization is not clean, and plate surface quality is excellent；
Rolling mill practice of the present invention is rolled, 1050 DEG C of roughing start rolling temperature, rough rolling step list using roughing+finish rolling Stand Mill
Reduction in pass >=25mm 790 DEG C of finishing temperature, throws steel speed 1m/s, rolls rear relaxation time 15s to temperature thickness according to 50mm,
Using ultrafast cold water-spraying control, 760 DEG C of cold temperature is opened, 630 DEG C of final cooling temperature.
The offline slow cooling of steel plate of the present invention, is covered using high temperature tarpaulin, and slow cooling 36 hours, ultrasonic examination grade reached
I grades.Mechanical property of steel plate testing result is shown in Table 1, metallographic structure (acicular ferrite+island bainite+M-A line and staff control, wherein M-
Organize area percentage≤2% in the island A) such as Fig. 1.
Embodiment 2
A kind of 600MPa grades of low yield strength ratio high-performance building steel and its production method are as described below.
Steel grade number is Q500GJEZ15, steel plate thickness 40mm in this production.
The technological process of production of this thickness steel plate are as follows: molten iron pretreatment → converter → LF refining → RH application of vacuum → slab
Slow cooling → rolling → steel plate heap is cold → examine storage.
The 40mm thickness Q500GJEZ15 chemical component is calculated as according to mass percent: C:0.08, Si:0.30, Mn:
1.40, Als:0.035, S:0.003, P:0.009, Cr:0.50, Ni:0.22, Cu:0.25, Nb:0.040, Ti:0.025, remaining
For Fe and inevitable impurity.
Converter procedure of the present invention, is smelted using top and bottom complex blowing, converter terminal C=0.045%, [C%] [O%] concentration product
0.0023%, tapping process uses the strong deoxidation of Al, and whole Argon stirs 35min, promotes deoxidation products to float and removes；
Refining procedure of the present invention, using LF+RH duplex refining treatment, effective control composition and 1585 DEG C of liquid steel temperature, RH
Total oxygen 20ppm after vacuum processing, hydrogen content 1.8ppm carry out after soft blow time 13min, RH vacuum breaker feeding Calcium treatment, calcium in steel
Content reaches 18ppm, carries out Metamorphism treatment to Al2O3 type impurity；
Continuous casting working procedure of the present invention uses Slab Caster production casting blank cross-section size for 280*1800mm, and casting machine is drawn
Fast stability contorting 0.95m/min；Using electromagnetic agitation, electric current 400A, frequency 5Hz effectively improve slab equiaxial crystal ratio, using casting
30mm technique under base solidification front stagnation pressure promotes slab consistency, is effectively improved inherent quality；
Heating process of the present invention, blank heating is to 1200 DEG C, in furnace duration 260min, using heating furnace burning+high pressure water fastly
Dephosphorization >=20MPa effectively solves the problems, such as that copper bearing steel dephosphorization is not clean, and plate surface quality is excellent；
Rolling mill practice of the present invention is rolled, 1080 DEG C of roughing start rolling temperature, rough rolling step list using roughing+finish rolling Stand Mill
Reduction in pass >=25mm 780 DEG C of finishing temperature, throws steel speed 1m/s, rolls rear relaxation time to temperature thickness according to 100mm
15s opens 750 DEG C of cold temperature using ultrafast cold water-spraying control, and 600 DEG C of final cooling temperature.
The offline slow cooling of steel plate of the present invention, is covered using high temperature tarpaulin, and slow cooling 48 hours, ultrasonic examination grade reached
I grades.Mechanical property of steel plate testing result is shown in Table 1.
Embodiment 3
A kind of 600MPa grades of low yield strength ratio high-performance building steel and its production method are as described below.
Steel grade number is Q500GJEZ15, steel plate thickness 25mm in this production.
The technological process of production of this thickness steel plate are as follows: molten iron pretreatment → converter → LF refining → RH application of vacuum → slab
Slow cooling → rolling → steel plate heap is cold → examine storage.
The 25mm thickness Q500GJEZ15 chemical component is calculated as according to mass percent: C:0.09, Si:0.28, Mn:
1.46, Als:0.031, S:0.002, P:0.010, Cr:0.40, Ni:0.20, Cu:0.28, Nb:0.032, Ti:0.020, remaining
For Fe and inevitable impurity.
Converter procedure of the present invention, is smelted using top and bottom complex blowing, converter terminal C=0.055%, [C%] [O%] concentration product
0.0024%, tapping process uses the strong deoxidation of Al, and whole Argon stirs 35min, promotes deoxidation products to float and removes；
Refining procedure of the present invention, using LF+RH duplex refining treatment, effective control composition and 1590 DEG C of liquid steel temperature, RH
Total oxygen 20ppm after vacuum processing, hydrogen content 1.8ppm carry out after soft blow time 14min, RH vacuum breaker feeding Calcium treatment, calcium in steel
Content reaches 18ppm, carries out Metamorphism treatment to Al2O3 type impurity；
Continuous casting working procedure of the present invention uses Slab Caster production casting blank cross-section size for 280*1800mm, and casting machine is drawn
Fast stability contorting 0.95m/min；Using electromagnetic agitation, electric current 400A, frequency 5Hz effectively improve slab equiaxial crystal ratio, using casting
30mm technique under base solidification front stagnation pressure promotes slab consistency, is effectively improved inherent quality；
Heating process of the present invention, blank heating is to 1200 DEG C, in furnace duration 275min, using heating furnace burning+high pressure water fastly
Dephosphorization >=20MPa effectively solves the problems, such as that copper bearing steel dephosphorization is not clean, and plate surface quality is excellent；
Rolling mill practice of the present invention is rolled, 1080 DEG C of roughing start rolling temperature, rough rolling step list using roughing+finish rolling Stand Mill
Reduction in pass >=25mm 785 DEG C of finishing temperature, throws steel speed 1m/s, rolls rear relaxation time to temperature thickness according to 100mm
15s opens 760 DEG C of cold temperature using ultrafast cold water-spraying control, and 590 DEG C of final cooling temperature.
The offline slow cooling of steel plate of the present invention, is covered using high temperature tarpaulin, and slow cooling 48 hours, ultrasonic examination grade reached
I grades.Mechanical property of steel plate testing result is shown in Table 1.
Embodiment 4
A kind of 600MPa grades of low yield strength ratio high-performance building steel and its production method are as described below.
Steel grade number is Q500GJEZ15, steel plate thickness 35mm in this production.
The technological process of production of this thickness steel plate are as follows: molten iron pretreatment → converter → LF refining → RH application of vacuum → slab
Slow cooling → rolling → steel plate heap is cold → examine storage.
The 35mm thickness Q500GJEZ15 chemical component is calculated as according to mass percent: C:0.11, Si:0.30, Mn:
1.60, Als:0.035, S:0.003, P:0.009, Cr:0.50, Ni:0.22, Cu:0.30, Nb:0.035, Ti:0.018, remaining
For Fe and inevitable impurity.
Converter procedure of the present invention, is smelted using top and bottom complex blowing, converter terminal C=0.050%, [C%] [O%] concentration product
0.0022%, tapping process uses the strong deoxidation of Al, and whole Argon stirs 25min, promotes deoxidation products to float and removes；
Refining procedure of the present invention, using LF+RH duplex refining treatment, effective control composition and liquid steel temperature, at RH vacuum
Total oxygen 18ppm after reason, hydrogen content 1.4ppm carry out after soft blow time 15min, RH vacuum breaker feeding Calcium treatment, and calcium content reaches in steel
To 28ppm, Metamorphism treatment is carried out to Al2O3 type impurity；
Continuous casting working procedure of the present invention uses Slab Caster production casting blank cross-section size for 280*1800mm, and casting machine is drawn
Fast stability contorting 0.95m/min；Using electromagnetic agitation, electric current 400A, frequency 5Hz effectively improve slab equiaxial crystal ratio, using casting
30mm technique under base solidification front stagnation pressure promotes slab consistency, is effectively improved inherent quality；
Heating process of the present invention, blank heating is to 1200 DEG C, in furnace duration 265min, using heating furnace burning+high pressure water fastly
Dephosphorization >=20MPa effectively solves the problems, such as that copper bearing steel dephosphorization is not clean, and plate surface quality is excellent；
Rolling mill practice of the present invention is rolled, 1050 DEG C of roughing start rolling temperature, rough rolling step list using roughing+finish rolling Stand Mill
Reduction in pass >=25mm 770 DEG C of finishing temperature, throws steel speed 1m/s, rolls rear relaxation time to temperature thickness according to 105mm
20s opens 770 DEG C of cold temperature using ultrafast cold water-spraying control, and 580 DEG C of final cooling temperature.
The offline slow cooling of steel plate of the present invention, is covered using high temperature tarpaulin, and slow cooling 48 hours, ultrasonic examination grade reached
I grades.Mechanical property of steel plate testing result is shown in Table 1.
Results of property table table 1
Claims (9)
1.600MPa grades of low yield strength ratio high-performance building steel plates, it is characterised in that: the chemical component of the steel plate presses quality hundred
Ratio is divided to be calculated as, C:0.08~0.12%, Si:0.20~0.30%, Mn:1.40~1.60%, Als:0.020~0.035%, S≤
0.010%, P≤0.012%, Cr:0.30~0.50%, Ni:0.17~0.22%, Cu:0.25~0.32%, Nb:0.020~
0.040%, Ti:0.015~0.025:, surplus is Fe and inevitable impurity；Its trade mark is Q500GJE, and the condition of delivery is
TMCP state.
2. 600MPa grades of low yield strength ratio high-performance building steel plate according to claim 1, which is characterized in that organization type
For the line and staff control that the acicular ferrite+island bainite+M-A is constituted, and area percent≤2% is organized on the island M-A.
3. a kind of production method of 600MPa of any of claims 1 or 2 grades of low yield strength ratios high-performance building steel plate, feature
It is, including following process: molten iron pretreatment → converter → LF refining → RH application of vacuum → slab slow cooling → rolling → steel plate
Heap is cold → examine storage.
4. production method according to claim 3, which is characterized in that the converter procedure: using top and bottom combined blown converter smelting, turn
Furnace terminal C≤0.06%, [C%] [O%] concentration product≤0.0024%, tapping process use the strong deoxidation of Al, whole Argon stirring.
5. production method according to claim 3, which is characterized in that the LF refining and RH application of vacuum process: using LF+RH
Duplex refining treatment, liquid steel temperature >=1580 DEG C, total oxygen are less than 25ppm, hydrogen content≤2ppm.
6. production method according to claim 3, which is characterized in that the slab slow cooling operation: using Slab Caster
Production casting blank cross-section size is 280*1800mm, 0.85~0.95m/min of casting machine pulling rate stability contorting；Using electromagnetic agitation and again
Depress 30mm technique, the offline slow cooling of slab.
7. production method according to claim 3, which is characterized in that the rolling process: blank heating is to 1200 DEG C, in furnace
Length >=250min is rolled, roughing start rolling temperature >=1020 DEG C using roughing and finish rolling Stand Mill, to temperature thickness according to 2~3 times at
Steel speed 1m/s is thrown in product thickness, finish rolling finishing temperature≤800 DEG C.
8. production method according to claim 3, which is characterized in that the steel plate heap cooling working procedure: using cold water-spraying control, open cold
750 DEG C~780 DEG C of temperature, final cooling temperature≤650 DEG C.
9. production method according to claim 3, which is characterized in that the inspection is put in storage process: the offline slow cooling of steel plate, using covering with mat
Cloth covers, and after slow cooling 36 hours expire, steel plate examines storage.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111172465A (en) * | 2020-02-28 | 2020-05-19 | 鞍钢股份有限公司 | Low-carbon equivalent large-thickness Q390GJ steel plate for building structure and manufacturing method thereof |
| CN111793777A (en) * | 2020-08-20 | 2020-10-20 | 山东华星新材料科技有限公司 | 1000 MPa-level hot-rolled high-strength corrosion-resistant dual-phase steel plate and preparation method thereof |
| CN113684417A (en) * | 2021-07-19 | 2021-11-23 | 中国科学院金属研究所 | Economical 690 MPa-level low-alloy corrosion-resistant refractory steel |
| CN115198193A (en) * | 2022-07-28 | 2022-10-18 | 湖南华菱湘潭钢铁有限公司 | TMCP (thermal mechanical control processing) process extra-thick specification offshore wind power steel EH36 and production method thereof |
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| CN111172465A (en) * | 2020-02-28 | 2020-05-19 | 鞍钢股份有限公司 | Low-carbon equivalent large-thickness Q390GJ steel plate for building structure and manufacturing method thereof |
| CN111172465B (en) * | 2020-02-28 | 2021-07-20 | 鞍钢股份有限公司 | Low-carbon equivalent large-thickness Q390GJ steel plate for building structure and manufacturing method thereof |
| CN111793777A (en) * | 2020-08-20 | 2020-10-20 | 山东华星新材料科技有限公司 | 1000 MPa-level hot-rolled high-strength corrosion-resistant dual-phase steel plate and preparation method thereof |
| CN113684417A (en) * | 2021-07-19 | 2021-11-23 | 中国科学院金属研究所 | Economical 690 MPa-level low-alloy corrosion-resistant refractory steel |
| CN115198193A (en) * | 2022-07-28 | 2022-10-18 | 湖南华菱湘潭钢铁有限公司 | TMCP (thermal mechanical control processing) process extra-thick specification offshore wind power steel EH36 and production method thereof |
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