CN108315541A - A kind of GB-Q＆T production methods no more than 1000MPa grades of water-power steel plates of 48mm thickness - Google Patents
A kind of GB-Q＆T production methods no more than 1000MPa grades of water-power steel plates of 48mm thickness Download PDFInfo
- Publication number
- CN108315541A CN108315541A CN201810213662.5A CN201810213662A CN108315541A CN 108315541 A CN108315541 A CN 108315541A CN 201810213662 A CN201810213662 A CN 201810213662A CN 108315541 A CN108315541 A CN 108315541A
- Authority
- CN
- China
- Prior art keywords
- temperature
- thickness
- water
- rolling
- steel plates
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 74
- 239000010959 steel Substances 0.000 title claims abstract description 74
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 17
- 238000005096 rolling process Methods 0.000 claims abstract description 47
- 238000005496 tempering Methods 0.000 claims abstract description 25
- 239000000203 mixture Substances 0.000 claims abstract description 18
- 238000010791 quenching Methods 0.000 claims abstract description 17
- 230000000171 quenching effect Effects 0.000 claims abstract description 17
- 239000000126 substance Substances 0.000 claims abstract description 17
- 229910052802 copper Inorganic materials 0.000 claims abstract description 7
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 7
- 229910052750 molybdenum Inorganic materials 0.000 claims abstract description 7
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 7
- 229910052758 niobium Inorganic materials 0.000 claims abstract description 7
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 7
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 7
- 229910052720 vanadium Inorganic materials 0.000 claims abstract description 7
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 6
- 238000000034 method Methods 0.000 claims description 22
- 238000009749 continuous casting Methods 0.000 claims description 20
- 238000010438 heat treatment Methods 0.000 claims description 20
- 238000002791 soaking Methods 0.000 claims description 19
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 12
- 239000003607 modifier Substances 0.000 claims description 11
- 238000012545 processing Methods 0.000 claims description 7
- 238000003723 Smelting Methods 0.000 claims description 6
- 238000005266 casting Methods 0.000 claims description 6
- 230000014759 maintenance of location Effects 0.000 claims description 6
- 229910052757 nitrogen Inorganic materials 0.000 claims description 6
- 238000007670 refining Methods 0.000 claims description 6
- 238000010079 rubber tapping Methods 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 238000013461 design Methods 0.000 abstract description 3
- 229910045601 alloy Inorganic materials 0.000 abstract description 2
- 239000000956 alloy Substances 0.000 abstract description 2
- 229910052799 carbon Inorganic materials 0.000 abstract description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 15
- 238000005098 hot rolling Methods 0.000 description 9
- 229910000734 martensite Inorganic materials 0.000 description 7
- FBPFZTCFMRRESA-JGWLITMVSA-N D-glucitol Chemical compound OC[C@H](O)[C@@H](O)[C@H](O)[C@H](O)CO FBPFZTCFMRRESA-JGWLITMVSA-N 0.000 description 6
- 238000001816 cooling Methods 0.000 description 6
- 229910052742 iron Inorganic materials 0.000 description 5
- 230000003647 oxidation Effects 0.000 description 5
- 238000007254 oxidation reaction Methods 0.000 description 5
- 241001417490 Sillaginidae Species 0.000 description 4
- 229910001563 bainite Inorganic materials 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 238000004125 X-ray microanalysis Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000003303 reheating Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000009864 tensile test Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000007669 thermal treatment Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
-
- 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
- C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
-
- 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
-
- 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
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
-
- 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
-
- 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
-
- 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
-
- 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
-
- 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
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
-
- 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
- C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
-
- 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
-
- 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
-
- 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
- C22C38/54—Ferrous alloys, e.g. steel alloys containing chromium with nickel with boron
Abstract
The invention discloses a kind of GB Q＆T production methods no more than 1000MPa grades of water-power steel plates of 48mm thickness, chemical composition is：C 0.12~0.18%, Si 0.25~0.70%, Mn≤1.30%, P≤0.01%, S≤0.002%, Ni≤1.50%, Cr 0.20~0.50%, Cu≤0.06%, Alt≤0.05%, Nb≤0.10%, Mo≤0.70%, V≤0.06%, Ti≤0.04%, B≤0.002%, surplus Fe.By the Design of Chemical Composition of low-carbon and low-alloy, and rational two-phase control rolling is carried out, room temperature is air-cooled to after rolling, then carry out offline Tempering and Quenching, the final water-power steel plate for obtaining tensile strength and reaching 1000MPa grades.
Description
Technical field
The invention belongs to field of metallurgy, more particularly to a kind of GB-Q＆ no more than 1000MPa grades of water-power steel plates of 48mm thickness
T production methods.
Background technology
Currently, the tensile strength of water-power steel plate develops to 1000MPa grades of direction.In general, water-power steel plate
Thickness specification is 10~100mm.With the increase of thickness specification, the microstructure and its mechanical property of steel plate are difficult to control and protect
Card.Therefore, it is necessary to for different thickness specifications from composition design, processing route control etc. proof strength and ballistic work etc.
Mechanical performance index.
Application No. is 201210244423.9 patents to propose a kind of water-power steel production method, can produce thickness specification not
Steel plate more than 25mm.It is rolled using two-stage control, 450~550 DEG C is quickly cooled to after rolling, cooling rate is 15~30
DEG C/s, it is air-cooled to room temperature later, finally carries out tempering heat treatment.Finally, yield strength >=520MPa of steel plate, tensile strength >=
60 DEG C of ballistic work >=250J of 640MPa, ﹣.
Application No. is a kind of hydroelectric project quenched and tempered high tensile strength plate of 201310426852.2 patent proposition and its preparations
Method can produce the steel plate of 16~40mm of thickness specification.Using two-stage control rolling+direct quenching+temper technique,
Yield strength >=504MPa, 40 DEG C of ballistic works of tensile strength 630~720MPa, ﹣ can reach 154J or more.
But the water-power steel plate no more than 40mm thickness of above-mentioned patented method production, which is unable to reach tensile strength, is
1000MPa grades of requirement.
Invention content
The object of the present invention is to provide a kind of GB-Q＆T producers no more than 1000MPa grades of water-power steel plates of 48mm thickness
Method.After GB-Q＆T production methods refer to two-phase control rolling, steel plate obtains granular bainite (GB) by air-cooled, then by quenching
(Q) and tempering (T) process of thermal treatment method.
In order to reach object above, the technical scheme is that：
The present invention provides a kind of GB-Q＆T production methods no more than 1000MPa grades of water-power steel plates of 48mm thickness, specific to walk
It is rapid as follows：
(1) according to the chemical composition smelting molten steel of setting and it is casting continuously to form slab, the chemical composition percentage by weight of continuous casting billet
Than for C0.12~0.18%, Si 0.25~0.70%, Mn≤1.30%, P≤0.01%, S≤0.002%, Ni≤1.50%,
Cr0.20~0.50%, Cu≤0.06%, Alt≤0.05%, Nb≤0.10%, Mo≤0.70%, V≤0.06%, Ti≤
0.02%, B≤0.002%, surplus Fe；
(2) slab is heated, 1200~1250 DEG C of soaking zone temperature, soaking time >=60min, tapping temperature 1200
± 20 DEG C, and steel temperature uniformity≤20 DEG C；
(3) high pressure water dephosphorization processing is carried out to the slab after heating, to remove slab oxygen caused by the heating period
Change iron sheet；
(4) two-stage control rolling is carried out after slab dephosphorization, roughing start rolling temperature is 1110~1150 DEG C, and finishing temperature is
980~1050 DEG C, rolling pass number is 6~8；Finish rolling start rolling temperature is 840~890 DEG C, and finishing temperature is 770~830 DEG C, is rolled
Road number processed is 4~8, carries out smooth, steel plate of the acquisition thickness no more than 48mm again later；
(5) steel plate after controlled rolling is air-cooled to room temperature, carries out offline modifier treatment, the quenching temperature of modifier treatment later
It is 870~970 DEG C, keeps the temperature 30~120min；The temperature of modifier treatment be 600~680 DEG C, tempering time be 30~
180min。
According to technical solution above, in the case of preferred, the continuous casting billet described in step (1) is using sub-lance technique and double steel
The LF/ double-station VD refining techniques of hired car formula.
According to technical solution above, in the case of preferred, the thickness of the continuous casting billet described in step (1) is 300mm.
According to technical solution above, in the case of preferred, the soaking time of the slab described in step (2) is 60~
120min。
According to technical solution above, in the case of preferred, smooth described in step (4) is that a time is smooth.
According to technical solution above, in the case of preferred, quenching and tempering heat treatment described in step (5) use nitrogen
Protection, makes surface of steel plate non-oxidation.
According to technical solution above, in the case of preferred, the soaking time described in step (5) reaches for steel plate center portion to be set
Start the retention time of timing after constant temperature degree.
The invention further relates to be not more than 1000MPa grades of water-power steel plates of 48mm thickness using above method production.
Continuous casting billet is air-cooled to room temperature and obtains granular bainite microstructure, obtained by quenching heat treatment after two-phase control rolling
Lath martensite tissue finally obtains tempered sorbite+a small amount of tempered martensite by tempering heat treatment.
By the calculating and optimization to material chemical composition, and rolling, cooling and modifier treatment technique optimization, finally
The 1000MPa grade water-power steel plates that thickness specification is not more than 48mm are obtained, mechanical performance index is as follows：Room-temperature yield strength
(transverse direction) >=885MPa, tensile strength (transverse direction) are 950~1130MPa, elongation percentage (transverse direction) >=60 DEG C of 15%, ﹣ V-type ballistic works
(transverse direction) >=140J.
Compare with the existing technology of the present invention has the advantages that notable and good effect：
By the Design of Chemical Composition of low-carbon and low-alloy, and reasonably rolling, cooling and Tempering and Quenching are carried out, finally obtained
Obtain 1000MPa grades of water-power steel plates：Room-temperature yield strength (transverse direction) >=885MPa, tensile strength (transverse direction) be 950~
1130MPa, elongation percentage (transverse direction) >=60 DEG C of 15%, ﹣ V-type ballistic works (transverse direction) >=140J.In addition, steel plate uses sky after hot rolling
The cold type of cooling, does not need cooling control device after rolling, to reduce the investment of equipment.
Description of the drawings
Fig. 1 is the micro-organization chart of the embodiment of the present invention 1；
Fig. 2 is the micro-organization chart of the embodiment of the present invention 2.
Specific implementation mode
Following nonlimiting examples can make those skilled in the art be more fully understood the present invention, but not with
Any mode limits the present invention.
According to GB/T228-2002 to the present invention's on CMT5105-SANS microcomputer controlled electronic universal testing machines
1000MPa grades of water-power steel plates carry out tensile test at room temperature, and Charpy pendulu formula impact experiment is in 60 DEG C of progress of ﹣, specimen size
10mm×10mm×55mm。
Using JXA-8530F types electro probe-X-ray microanalysis to the present invention 1000MPa grade water-power steel plates into
Hang Liao microstructure observations analyze.
According to the GB-Q＆T production methods no more than 1000MPa grades of water-power steel plates of 48mm thickness of the present invention, specific implementation
Case is as follows：
Embodiment 1
(1) it smelts and casts：According to the chemical composition smelting molten steel of setting, using sub-lance technique and double ladle vehicle types
LF/ double-station VD refining techniques is simultaneously casting continuously to form slab, and the chemical composition of continuous casting billet is C 0.12%, Si by weight percentage
0.27%, Mn 1.15%, P 0.007%, S 0.001%, Ni 1.30%, Cr 0.32%, Cu 0.02%, Alt
0.03%, Nb 0.03%, Mo 0.43%, V 0.05%, Ti 0.02%, B 0.001%, surplus Fe；The thickness of continuous casting billet
For 300mm；(2) continuous casting billet heats：Slab uses three stage stepped heatings, 1220 DEG C of soaking zone temperature, soaking time
80min, 1200 DEG C of tapping temperature, and steel temperature uniformity≤20 DEG C；
(3) dephosphorization：Slab after coming out of the stove carries out high pressure water dephosphorization processing, to remove slab caused by the heating period
Iron scale；
(4) hot rolling：After slab dephosphorization two-phase control rolling, roughing start rolling temperature 1145 are carried out using 4700mm four-high mills
DEG C, finishing temperature is 990 DEG C, and rolling pass number is 6；Finish rolling start rolling temperature is 880 DEG C, and finishing temperature is 820 DEG C, rolling pass
Number is 4, carries out that a time is smooth again later, and the finish to gauge thickness of steel plate is 48mm.
(5) Tempering and Quenching：Steel plate after hot rolling is air-cooled to room temperature, carries out offline modifier treatment later.It is offline to reheat
Temperature is 920 DEG C, is quenched after keeping the temperature 60min, finally carries out temper, tempering holding temperature is 630 DEG C, and tempering time is
60min.Soaking time is the retention time that steel plate center portion reaches beginning timing after set temperature.Wherein quenching and tempering heat treatment
Using nitrogen protection, make surface of steel plate non-oxidation.
The yield strength (transverse direction) of the present embodiment steel plate is 945MPa, and tensile strength (transverse direction) is 967MPa, elongation of having no progeny
60 DEG C of V-type ballistic work (transverse direction) 189J of rate (transverse direction) 18.4%, ﹣.
Fig. 1 is the microscopic structure of the embodiment of the present invention 1.It can obtain：The microscopic structure master of the steel plate of the embodiment of the present invention
If the tempered martensite of tempered sorbite+a small amount of.
Embodiment 2
Chemical composition, rolling and the cooling technique of embodiment 2 and embodiment 1 is the same, the difference is that the two
It is offline to reheat hardening heat difference.The offline reheating hardening heat of embodiment 2 is 950 DEG C.
The yield strength (transverse direction) of the present embodiment steel plate is 960MPa, and tensile strength (transverse direction) is 980MPa, elongation of having no progeny
60 DEG C of V-type ballistic work (transverse direction) 171J of rate (transverse direction) 17.9%, ﹣.
Fig. 2 is the microscopic structure of the embodiment of the present invention 2.It can obtain：The microscopic structure master of the steel plate of the embodiment of the present invention
If the tempered martensite of tempered sorbite+a small amount of.
Embodiment 3
(1) it smelts and casts：According to the chemical composition smelting molten steel of setting, using sub-lance technique and double ladle vehicle types
LF/ double-station VD refining techniques is simultaneously casting continuously to form slab, and the chemical composition of continuous casting billet is C 0.15%, Si by weight percentage
0.43%, Mn 0.95%, P 0.009%, S 0.001%, Ni 1.46%, Cr 0.41%, Cu 0.03%, Alt
0.04%, Nb 0.06%, Mo 0.56%, V 0.03%, Ti 0.02%, B 0.001%, surplus Fe；The thickness of continuous casting billet
For 300mm；(2) continuous casting billet heats：Slab uses three stage stepped heatings, 1230 DEG C of soaking zone temperature, soaking time
80min, 1200 DEG C of tapping temperature, and steel temperature uniformity≤20 DEG C；
(3) dephosphorization：Slab after coming out of the stove carries out high pressure water dephosphorization processing, to remove slab caused by the heating period
Iron scale；
(4) hot rolling：Two-stage control rolling is carried out using 4700mm four-high mills after slab dephosphorization, roughing start rolling temperature is
1135 DEG C, finishing temperature is 985 DEG C, and rolling pass number is 8；Finish rolling start rolling temperature is 870 DEG C, and finishing temperature is 815 DEG C, rolling
Road number is 4, carries out that a time is smooth again later, and the finish to gauge thickness of steel plate is 24mm.
(5) Tempering and Quenching：Steel plate after hot rolling is air-cooled to room temperature, carries out offline modifier treatment later.It is offline to reheat
Temperature is 920 DEG C, is quenched after keeping the temperature 60min, finally carries out temper, tempering holding temperature is 630 DEG C, and tempering time is
60min.Soaking time is the retention time that steel plate center portion reaches beginning timing after set temperature.Wherein quenching and tempering heat treatment
Using nitrogen protection, make surface of steel plate non-oxidation.
The microscopic structure of the present embodiment is the tempered martensite of tempered sorbite+a small amount of, the yield strength (transverse direction) of steel plate
For 978MPa, tensile strength (transverse direction) is 995MPa, 60 DEG C of V-type ballistic works (transverse direction) of elongation after fracture (transverse direction) 18.2%, ﹣
193J。
Embodiment 4
(1) it smelts and casts：According to the chemical composition smelting molten steel of setting, using sub-lance technique and double ladle vehicle types
LF/ double-station VD refining techniques is simultaneously casting continuously to form slab, and the chemical composition of continuous casting billet is C 0.16%, Si by weight percentage
0.49%, Mn 1.25%, P 0.008%, S 0.001%, Ni 1.41%, Cr 0.43%, Cu 0.05%, Alt
0.04%, Nb 0.08%, Mo 0.45%, V 0.06%, Ti 0.02%, B 0.001%, surplus Fe；The thickness of continuous casting billet
For 300mm；
(2) continuous casting billet heats：Slab uses three stage stepped heatings, 1240 DEG C of soaking zone temperature, soaking time
80min, 1220 DEG C of tapping temperature, and steel temperature uniformity≤20 DEG C；
(3) dephosphorization：Slab after coming out of the stove carries out high pressure water dephosphorization processing, to remove slab caused by the heating period
Iron scale；
(4) hot rolling：Two-stage control rolling is carried out using 4700mm four-high mills after slab dephosphorization, roughing start rolling temperature is
1147 DEG C, finishing temperature is 980 DEG C, and rolling pass number is 8；Finish rolling start rolling temperature is 886 DEG C, and finishing temperature is 807 DEG C, rolling
Road number is 6, carries out that a time is smooth again later, and the finish to gauge thickness of steel plate is 10mm.
(5) Tempering and Quenching：Steel plate after hot rolling is air-cooled to room temperature, carries out offline modifier treatment later.It is offline to reheat
Temperature is 900 DEG C, is quenched after keeping the temperature 40min, finally carries out temper, tempering holding temperature is 630 DEG C, and tempering time is
60min.Soaking time is the retention time that steel plate center portion reaches beginning timing after set temperature.Wherein quenching and tempering heat treatment
Using nitrogen protection, make surface of steel plate non-oxidation.
The microscopic structure of the present embodiment is the tempered martensite of tempered sorbite+a small amount of, the yield strength (transverse direction) of steel plate
For 1017MPa, tensile strength (transverse direction) is 1045MPa, 60 DEG C of V-type ballistic works (transverse direction) of elongation after fracture (transverse direction) 18.7%, ﹣
195J。
Embodiment 5
(1) it smelts and casts：According to the chemical composition smelting molten steel of setting, using sub-lance technique and double ladle vehicle types
LF/ double-station VD refining techniques is simultaneously casting continuously to form slab, and the chemical composition of continuous casting billet is C 0.16%, Si by weight percentage
0.37%, Mn 1.20%, P 0.007%, S 0.001%, Ni 1.50%, Cr 0.39%, Cu 0.04%, Alt
0.04%, Nb 0.08%, Mo 0.63%, V 0.04%, Ti 0.02%, B 0.001%, surplus Fe；The thickness of continuous casting billet
For 300mm；(2) continuous casting billet heats：Slab uses three stage stepped heatings, 1220 DEG C of soaking zone temperature, soaking time
90min, 1200 DEG C of tapping temperature, and steel temperature uniformity≤20 DEG C；
(3) dephosphorization：Slab after coming out of the stove carries out high pressure water dephosphorization processing, to remove slab caused by the heating period
Iron scale；
(4) hot rolling：Two-stage control rolling is carried out using 4700mm four-high mills after slab dephosphorization, roughing start rolling temperature is
1130 DEG C, finishing temperature is 990 DEG C, and rolling pass number is 7；Finish rolling start rolling temperature is 865 DEG C, and finishing temperature is 800 DEG C, rolling
Road number is 5, carries out that a time is smooth again later, and the finish to gauge thickness of steel plate is 32mm.
(5) Tempering and Quenching：Steel plate after hot rolling is air-cooled to room temperature, carries out offline modifier treatment later.It is offline to reheat
Temperature is 920 DEG C, is quenched after keeping the temperature 40min, finally carries out temper, tempering holding temperature is 630 DEG C, and tempering time is
60min.Soaking time is the retention time that steel plate center portion reaches beginning timing after set temperature.Wherein quenching and tempering heat treatment
Using nitrogen protection, make surface of steel plate non-oxidation.
The microscopic structure of the present embodiment is the tempered martensite of tempered sorbite+a small amount of, the yield strength (transverse direction) of steel plate
For 995MPa, tensile strength (transverse direction) is 1021MPa, 60 DEG C of V-type ballistic works (transverse direction) of elongation after fracture (transverse direction) 18.5%, ﹣
188J。
In addition to the implementation, the present invention can also have other embodiment.It is all to use equivalent substitution or equivalent transformation shape
At technical solution, fall within the scope of protection required by the present invention.
Claims (8)
1. a kind of GB-Q＆T production methods no more than 1000MPa grades of water-power steel plates of 48mm thickness, which is characterized in that specific steps
It is as follows：
(1) according to the chemical composition smelting molten steel of setting and it is casting continuously to form slab, the chemical composition of continuous casting billet is C by weight percentage
0.12~0.18%, Si 0.25~0.70%, Mn≤1.30%, P≤0.01%, S≤0.002%, Ni≤1.50%, Cr
0.20~0.50%, Cu≤0.06%, Alt≤0.05%, Nb≤0.10%, Mo≤0.70%, V≤0.06%, Ti≤
0.02%, B≤0.002%, surplus Fe；
(2) slab after continuous casting is heated, 1200~1250 DEG C of soaking zone temperature, soaking time >=60min, tapping temperature
1200 ± 20 DEG C, and steel temperature uniformity≤20 DEG C；
(3) high pressure water dephosphorization processing is carried out to the slab after heating；
(4) two-stage control rolling is carried out after slab dephosphorization, roughing start rolling temperature is 1110~1150 DEG C, finishing temperature 980
~1050 DEG C, rolling pass number is 6~8；Finish rolling start rolling temperature is 840~890 DEG C, and finishing temperature is 770~830 DEG C, rolling
Road number is 4~8, carries out smooth, steel plate of the acquisition thickness no more than 48mm again later；
(5) steel plate after controlled rolling is air-cooled to room temperature, carries out offline modifier treatment later, and the quenching temperature of modifier treatment is
870~970 DEG C, keep the temperature 30~120min；The temperature of modifier treatment be 600~680 DEG C, tempering time be 30~
180min。
2. the GB-Q＆T production methods according to claim 1 no more than 1000MPa grades of water-power steel plates of 48mm thickness, special
Sign is that the continuous casting billet described in step (1) is using sub-lance technique and pair LF/ double-station VD refining techniques of ladle vehicle types.
3. the GB-Q＆T production methods according to claim 1 no more than 1000MPa grades of water-power steel plates of 48mm thickness, special
Sign is that the thickness of the continuous casting billet described in step (1) is 300mm.
4. the GB-Q＆T production methods according to claim 1 no more than 1000MPa grades of water-power steel plates of 48mm thickness, special
Sign is that smooth described in step (4) is that a time is smooth.
5. the GB-Q＆T production methods according to claim 1 no more than 1000MPa grades of water-power steel plates of 48mm thickness, special
Sign is that the quenching and tempering heat treatment described in step (5) use nitrogen protection.
6. the GB-Q＆T production methods according to claim 1 no more than 1000MPa grades of water-power steel plates of 48mm thickness, special
Sign is that the soaking time described in step (5) is the retention time that steel plate center portion reaches beginning timing after set temperature.
7. method production as claimed in any one of claims 1 to 6 is not more than 1000MPa grades of water-power steel plates of 48mm thickness.
8. according to claim 7 be not more than 1000MPa grades of water-power steel plates of 100mm thickness, which is characterized in that its mechanical property
Energy index is as follows：Room-temperature yield strength >=885MPa, tensile strength are 950~1130MPa, 60 DEG C of V-types of elongation percentage >=15%, ﹣
Ballistic work >=140J.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810213662.5A CN108315541B (en) | 2018-03-15 | 2018-03-15 | A kind of GB-Q & T production method no more than 1000MPa grades of water-power steel plates of 48mm thickness |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810213662.5A CN108315541B (en) | 2018-03-15 | 2018-03-15 | A kind of GB-Q & T production method no more than 1000MPa grades of water-power steel plates of 48mm thickness |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108315541A true CN108315541A (en) | 2018-07-24 |
| CN108315541B CN108315541B (en) | 2019-06-04 |
Family
ID=62902627
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810213662.5A Expired - Fee Related CN108315541B (en) | 2018-03-15 | 2018-03-15 | A kind of GB-Q & T production method no more than 1000MPa grades of water-power steel plates of 48mm thickness |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108315541B (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102080190A (en) * | 2011-02-14 | 2011-06-01 | 东北大学 | Hardening and tempering steel plate for engineering machinery with 7000MPa grade yield strength and preparation method thereof |
| CN102321847A (en) * | 2011-10-20 | 2012-01-18 | 南京钢铁股份有限公司 | Quenching and tempering structure thick steel plate for offshore platform and production method for quenching and tempering structure thick steel plate |
| CN102337458A (en) * | 2011-10-17 | 2012-02-01 | 武汉钢铁(集团)公司 | Steel with tensile strength not lower than 1100MPa for engineering machinery and production method thereof |
| CN102676933A (en) * | 2012-05-23 | 2012-09-19 | 南京钢铁股份有限公司 | Low-alloy super-strength high-toughness steel plate and production method thereof |
| CN103397272A (en) * | 2013-07-29 | 2013-11-20 | 莱芜钢铁集团有限公司 | Abrasion-resistant steel plate with low crack sensitive index and high strength and preparation method thereof |
| CN107760998A (en) * | 2017-10-12 | 2018-03-06 | 河钢股份有限公司 | Inexpensive quenching and tempering type 690MPa level steel for engineering machinery plates and production method |
-
2018
- 2018-03-15 CN CN201810213662.5A patent/CN108315541B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102080190A (en) * | 2011-02-14 | 2011-06-01 | 东北大学 | Hardening and tempering steel plate for engineering machinery with 7000MPa grade yield strength and preparation method thereof |
| CN102337458A (en) * | 2011-10-17 | 2012-02-01 | 武汉钢铁(集团)公司 | Steel with tensile strength not lower than 1100MPa for engineering machinery and production method thereof |
| CN102321847A (en) * | 2011-10-20 | 2012-01-18 | 南京钢铁股份有限公司 | Quenching and tempering structure thick steel plate for offshore platform and production method for quenching and tempering structure thick steel plate |
| CN102676933A (en) * | 2012-05-23 | 2012-09-19 | 南京钢铁股份有限公司 | Low-alloy super-strength high-toughness steel plate and production method thereof |
| CN103397272A (en) * | 2013-07-29 | 2013-11-20 | 莱芜钢铁集团有限公司 | Abrasion-resistant steel plate with low crack sensitive index and high strength and preparation method thereof |
| CN107760998A (en) * | 2017-10-12 | 2018-03-06 | 河钢股份有限公司 | Inexpensive quenching and tempering type 690MPa level steel for engineering machinery plates and production method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108315541B (en) | 2019-06-04 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106216391B (en) | A kind of rolling production method reducing 42CrMo hardness | |
| CN107858586B (en) | A kind of preparation method of the high strength and ductility without yield point elongation cold rolling medium managese steel plate | |
| CN112981235B (en) | Hardened and tempered steel plate with yield strength of 420MPa grade for building structure and production method thereof | |
| CN106282789A (en) | A kind of low-carbon (LC) spy's thickness TMCP type Q420qE bridge steel and manufacture method thereof | |
| CN104711488B (en) | Big 690 grades of ocean engineering high strength steel plates of thickness F and its production method | |
| CN108359879A (en) | A kind of DQ-T methods no more than 1000MPa grades of water-power steel plates of 60mm thickness | |
| CN106756495A (en) | A kind of 1760MPa superelevation strong anti-bullet steel and its manufacture method | |
| CN105861941A (en) | Ultra-thick steel plate for hydrogen-contacting equipment and preparation method of ultra-thick steel plate | |
| CN108193137B (en) | DQ-Q & T method of 1000 MPa-grade hydroelectric steel plate with thickness not greater than 80mm | |
| CN107245652A (en) | The big high die welding performance SA516Gr60 steel plates of thickness and its production method | |
| CN108300939A (en) | A kind of low cost Q550D high strength steel plates and its production method | |
| CN104451386B (en) | A kind of low yield strength ratio oil reserve is 610Mpa high-strength steel sheet and manufacture method thereof for tank body | |
| CN106119713A (en) | A kind of low-carbon (LC) spy thickness low yield strength ratio reel steel S355NL and manufacture method thereof | |
| CN110453146A (en) | A kind of Cr alloying steel of no yield point elongation and preparation method thereof | |
| CN105908084A (en) | Tempering type high-strength steel plate for low-temperature container and production method for tempering type high-strength steel plate | |
| CN107012398B (en) | A kind of Nb-microalloying TRIP steel and preparation method thereof | |
| CN109252107B (en) | Production method of high-flatness ultrahigh-strength steel | |
| CN109266812A (en) | A kind of coal mine hydraulic supporting low yield strength ratio high-strength hardened and tempered steel and its manufacturing method | |
| CN109136482A (en) | Inexpensive yield strength >=960Mpa high intensity cut deal and its production method | |
| CN108385034B (en) | LGB-Q & T method for 1000 MPa-grade hydroelectric steel plate with thickness not greater than 100mm | |
| CN110484834A (en) | A kind of Cr, Mn alloying TRIP steel and preparation method thereof | |
| CN113846266A (en) | Production method of high-ductility and toughness quenched and tempered steel plate with yield strength of 1300MPa | |
| CN108624744A (en) | A kind of Q500qE bridge steel plates and its production method | |
| CN102560274A (en) | Hardened and tempered ultrahigh-strength steel with 1000MPa-grade yield strength and production method thereof | |
| CN102181619A (en) | Method for manufacturing non-tempering low-carbon bainite type high-strength steel plate of 1000Mpa grade |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20220628 Address after: No.11, Wenhua Road, Sanxiang, Heping District, Shenyang City, Liaoning Province Patentee after: Northeastern University Patentee after: Nanjing iron and steel Limited by Share Ltd Address before: No.11, Wenhua Road, Sanxiang, Heping District, Shenyang City, Liaoning Province Patentee before: Northeastern University |
|
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20190604 |