CN106337153B - The weathering steel of think gauge containing vanadium and its milling method - Google Patents
The weathering steel of think gauge containing vanadium and its milling method Download PDFInfo
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- CN106337153B CN106337153B CN201611008942.XA CN201611008942A CN106337153B CN 106337153 B CN106337153 B CN 106337153B CN 201611008942 A CN201611008942 A CN 201611008942A CN 106337153 B CN106337153 B CN 106337153B
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- 229910052720 vanadium Inorganic materials 0.000 title claims abstract description 59
- 229910000870 Weathering steel Inorganic materials 0.000 title claims abstract description 52
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 title claims abstract description 46
- 238000003801 milling Methods 0.000 title abstract description 6
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 53
- 239000010959 steel Substances 0.000 claims abstract description 53
- 239000000126 substance Substances 0.000 claims abstract description 19
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 16
- 229910052802 copper Inorganic materials 0.000 claims abstract description 14
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 13
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 12
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 12
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 12
- 239000012535 impurity Substances 0.000 claims abstract description 6
- 238000005096 rolling process Methods 0.000 claims description 47
- 238000001816 cooling Methods 0.000 claims description 40
- 238000005098 hot rolling Methods 0.000 claims description 19
- 238000000034 method Methods 0.000 claims description 18
- 235000019628 coolness Nutrition 0.000 claims description 8
- 239000000203 mixture Substances 0.000 claims description 5
- 229910052750 molybdenum Inorganic materials 0.000 abstract description 8
- 229910052782 aluminium Inorganic materials 0.000 abstract description 7
- 229910001566 austenite Inorganic materials 0.000 description 15
- 239000010949 copper Substances 0.000 description 15
- 238000004519 manufacturing process Methods 0.000 description 10
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 7
- 239000013078 crystal Substances 0.000 description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 5
- 229910052799 carbon Inorganic materials 0.000 description 5
- 238000004458 analytical method Methods 0.000 description 4
- 150000004767 nitrides Chemical class 0.000 description 4
- 238000003466 welding Methods 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 3
- 229910052758 niobium Inorganic materials 0.000 description 3
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- 238000001953 recrystallisation Methods 0.000 description 3
- 229910000859 α-Fe Inorganic materials 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 238000005275 alloying Methods 0.000 description 2
- 239000004568 cement Substances 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000005012 migration Effects 0.000 description 2
- 238000013508 migration Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 239000005864 Sulphur Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052796 boron Inorganic materials 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000002667 nucleating agent Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 230000033764 rhythmic process Effects 0.000 description 1
- 238000007788 roughening Methods 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 238000004781 supercooling Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- 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
- 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
- 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
- C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
-
- 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
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
-
- 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
- C22C38/16—Ferrous alloys, e.g. steel alloys containing 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
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
The present invention relates to weathering steel and its milling method, and in particular to the weathering steel of think gauge containing vanadium and its milling method, belong to steel technical field.The weathering steel of think gauge containing vanadium, chemical component weight percentage are：C：≤ 0.12%, Si：≤ 0.50%, Mn：≤ 1.50%, P：≤ 0.02%, S：≤ 0.008%, V：≤ 0.12%, Cu：0.20%~0.55%, Cr：0.30%~1.25%, Ni：0.10%~0.65%, remaining is Fe and inevitable impurity；Wherein, thickness >=14mm of the weathering steel of think gauge containing vanadium.The weathering steel good toughness of think gauge containing vanadium of the present invention, does not add Mo and Al elements, component is simple, and cost is low.
Description
Technical field
The present invention relates to weathering steel and its milling method, and in particular to the weathering steel of think gauge containing vanadium and its milling method, belong to
In steel technical field.
Background technology
Weathering steel, also known as weather resisting steel, are by adding the alloys such as a certain amount of Cu, P, Cr, Ni in ordinary steel
A kind of low-alloy steel made of element.The characteristics of weathering steel is the corrosion that can be resisted under the conditions of natural atmosphere.
Chinese patent application 201310214275.0 discloses a kind of high-strength weathering steel, its chemical composition is (weight hundred
Divide ratio)：0.05%≤C≤0.06%, 0.25%≤Cu≤0.35%, 0.36%≤Si≤0.45%, 0.80%≤Mn≤
1.00%, 0.055%≤Al≤0.065%, 0.10%≤Ni≤0.19%, 0.41%≤Cr≤0.50%, 0.05%≤Mo
≤ 0.15%, 0.01%≤Ti≤0.02%, 0.016%≤V≤0.030%, 0.005%≤Nb≤0.010%, 0.005%
≤ B≤0.008%, S≤0.010%, P≤0.025%, N≤0.005%, surplus Fe.It is in the component of traditional weathering steel
A variety of microalloy elements such as Al, Mo, V, Nb, B alloying for composite is added, reduces Cu in weathering steel, P content, is eliminated
Cu, P caused crisp harm of copper brittleness and phosphorus in weathering steel, improves the intensity and weather resistance of steel.Need Al, Mo, V, Nb,
A variety of microalloy elements such as B alloying for composite, component is more complicated, and cost is higher.
Chinese patent application 201010113848.7 discloses a kind of weather-resistant steel plate, and the mass percent of its component is：C：
0.02~0.10, Si：0.10~0.40, Mn：1.0~1.6, P：≤ 0.025, S：≤ 0.015, Cu：0.20~0.50, Cr：
0.30~0.60, Ni：0.10~0.50, Mo：≤ 0.40, Nb：≤ 0.060, V：≤ 0.060, Ti：0.010~0.035, B：≤
0.0030, Ca：≤ 0.0050, Al：0.015~0.050, remaining is Fe and other inevitable impurity.Its weather-resistant steel plate has
There are higher intensity and low-temperature flexibility, atmospheric corrosion resistance is excellent, and has preferable weldability, but it stills need to add
Al, Mo element, complicated component are of high cost.
Chinese patent application 201610285086.6 discloses a kind of 800MPa grade high-strength weatherings steel plate, and its producer
Method, the percentage by weight of high-strength weathering steel plate chemical composition is C≤0.12%, Si≤0.40%, Mn：1.60~2.00%, P≤
0.025%, S≤0.010%, Nb+V+Ti：0.10~0.40%, Mo:0.10~0.45%, Als：0.015~0.050%, N
≤ 0.008%, surplus is Fe and inevitable impurity element.Its tensile strength >=900MPa, yield strength >=800MPa, prolongs
Rate >=18% is stretched, but it stills need addition Al, Mo element, complicated component is of high cost.
The content of the invention
First technical problem to be solved by this invention is to provide a kind of weathering steel of think gauge containing vanadium, this contains vanadium think gauge
Weather-proof composition of steel is simple, good toughness.
To solve above-mentioned first technical problem, technical scheme is as follows：
The weathering steel of think gauge containing vanadium, chemical component weight percentage are：C：≤ 0.12%, Si：≤ 0.50%, Mn：≤
1.50%, P：≤ 0.02%, S：≤ 0.008%, V：≤ 0.12%, Cu：0.20%~0.55%, Cr：0.30%~1.25%,
Ni：0.10%~0.65%, remaining is Fe and inevitable impurity；
Wherein, thickness >=14mm of the weathering steel of think gauge containing vanadium.
Preferably, the percentage by weight of vanadium is：0.07≤V≤0.12%.
Further, the weathering steel of think gauge containing vanadium is prepared with the following method：
A. steel billet is smelted according to above-mentioned chemical analysis；B. hot rolling；C. cool down；D. batch；
Wherein, the cooling means of step c is double section section coolings, 6~10 seconds interval times.
Preferably, finish rolling start rolling temperature is 950 DEG C~1050 DEG C in the b step, and finishing temperature is 880 DEG C~920 DEG C；
It is 600 DEG C~660 DEG C to batch the temperature in step.
Preferably, the 14~29mm of thickness, more preferably 14~20mm of the weathering steel of think gauge containing vanadium..
Second technical problem to be solved by this invention is to provide a kind of weathering steel hot-rolling method of think gauge containing vanadium, the party
The think gauge structure of steel of method rolling is uniform, good toughness.
To solve above-mentioned second technical problem, technical scheme is as follows:
The weathering steel hot-rolling method of think gauge containing vanadium includes the following steps：
A. steel billet is smelted according to above-mentioned chemical analysis；B. hot rolling；C. cool down；D. batch；
Wherein, the cooling means of step c is double section section coolings, 6~10 seconds interval times.
Preferably, finish rolling start rolling temperature is 950 DEG C~1050 DEG C in the b step, and finishing temperature is 880 DEG C~920 DEG C；
D. the temperature in step is 600 DEG C~660 DEG C.
Preferably, finish rolling start rolling temperature is 985~1050 DEG C in the b step, and finishing temperature is 880 DEG C~895 DEG C；d.
Temperature in step is 605 DEG C~625 DEG C.
Preferably, finish rolling start rolling temperature is 985~1050 DEG C in the b step, and finishing temperature is 905 DEG C~915 DEG C；d.
Temperature in step is 635 DEG C~660 DEG C.
Beneficial effect：The weathering steel good toughness of think gauge containing vanadium of the present invention, does not add Mo and Al elements, and component is simple, into
This is low.
The rolling mill practice of the present invention, by Controlled cooling process, using double sections of section coolings, 6~10 seconds interval times
Cooling technique, can effectively improve think gauge weathering steel structural homogenity, so as to further improve the comprehensive performance of thick weathering steel.Energy
The weathering steel of think gauge containing vanadium of more than 14mm thickness is rolled, there is rolling accepted product percentage height, method is simple, production cost is low, production
The advantages that product high comprehensive performance.
Embodiment
The weathering steel of think gauge containing vanadium of the present invention, chemical component weight percentage are：C：≤ 0.12%, Si：≤ 0.50%,
Mn：≤ 1.50%, P：≤ 0.02%, S：≤ 0.008%, V：≤ 0.12%, Cu：0.20%~0.55%, Cr：0.30%~
1.25%, Ni：0.10%~0.65%, remaining is Fe and inevitable impurity；
Wherein, thickness >=14mm of the weathering steel of think gauge containing vanadium.
In the weathering steel of hot tandem rolling thickness >=14mm specifications, due to being limited by slab thickness, compression is compared
Small, structure refinement is more difficult, and structural homogenity control of the section cooling to think gauge thickness direction is increasingly difficult, causes think gauge
Weathering steel cold impact value is low, mechanical property is low etc..Vanadium can play the role of crystal grain thinning.
Vanadium mainly has weathering steel following effect：
(1) AUSTENITE GRAIN COARSENING is prevented：With the raising of heating-up temperature and the extension of soaking time, austenite grain will
It is more thick, and thick austenite is unfavorable to the processability and fining ferrite of steel.Austenite crystal grain length can be prevented by adding V
Greatly, the Coarsening Temperature of steel is improved.This is because the little particle of their carbon, nitride diffusion can play austenite grain boundary fixed make
With hindering the migration of austenite grain boundary, that is, prevent Austenite Grain Growth.
(2) fining ferrite grains：With the progress of rolling, temperature gradually reduces, and the carbon of V, nitride are in austenite
Solubility product reduce, the effect of deformation-induced precipitation in addition, its carbon, nitride are analysed in austenite to disperse before ferritic transformation
Go out, become ferritic nucleating agent, ferrite is largely formed under less degree of supercooling, be not easy to grow up, so as to refine iron
Ferritic crystal grain.
(3) austenite recrystallization temperature is improved：The solubility of V and carbon, nitride in austenite is larger, and temperature is relatively low
When, austenite is supersaturated solid solution, and deformation at this time can induce supersaturated austenite to precipitate；These tiny sediments compared with
More is distributed near the austenite grain boundary or subgrain of deformation, it is suppressed that crystal boundary migration and there is significant delay to imitate recrystallization
Fruit.Austenite recrystallization temperature is improved, Unhydrated cement can be expanded, this is to highly useful in Unhydrated cement controlled rolling.
(4) welding performance of steel is improved：In use, welding point is its weak link to steel, particularly heat affecting
Area's most destructible.Micro V is added in steel, on the one hand, intensity can be improved while carbon equivalent is reduced, so as to improve steel
Welding performance；On the other hand, foreign body such as oxygen, nitrogen, sulphur etc. are fixed up, so as to improve the solderability of steel；Secondly as
The undissolved property of its microcosmic particle at high temperature, can prevent the roughening of heat affected area crystal grain, improve the toughness of heat affected area, so that
Improve the welding performance of steel.
Preferably, the percentage by weight of vanadium is：0.07≤V≤0.12%.
Further, the weathering steel of think gauge containing vanadium is prepared with the following method：
A. steel billet is smelted according to above-mentioned chemical analysis；B. hot rolling；C. cool down；D. batch；
Wherein, the cooling means of step c is double section section coolings, 6~10 seconds interval times.
In the weathering steel of hot tandem rolling thickness >=14mm specifications, due to being limited by slab thickness, compression is smaller,
Structure refinement is more difficult, and structural homogenity control of the section cooling to think gauge thickness direction is increasingly difficult, causes think gauge resistance to
Steel cold impact value is low, mechanical property is low etc. is waited, vanadium can play the role of crystal grain thinning.But the tissue of thickness direction is poor
It is different still larger, the further research cooling technique of the present invention, using double sections of section coolings, the cooling technique of 6~10 seconds interval times,
Think gauge weathering steel structural homogenity can be improved, so as to further improve the comprehensive performance of thick weathering steel.
Temperature is too low, and rolling rhythm is too slow, and low production efficiency, temperature is too high, and operation of rolling cooling velocity is too fast, and tissue is not
Uniformly, low temperature impact properties are influenced, finished product comprehensive performance is poor.Therefore finish rolling start rolling temperature preferably 950 DEG C~1050 in b step
DEG C, preferably 880 DEG C~920 DEG C of finishing temperature；Temperature is too low, the precipitation strength declines of V, poor mechanical property.Temperature is too high,
Finished product coarse grains, intensity is low, and low temperature impact properties are poor, therefore batches preferably 600 DEG C~660 DEG C of the temperature in step.
Preferably, the 14~29mm of thickness, more preferably 14~20mm of the weathering steel of think gauge containing vanadium.
The weathering steel hot-rolling method of think gauge containing vanadium of the present invention includes the following steps：
A. steel billet is smelted according to above-mentioned chemical analysis；B. hot rolling；C. cool down；D. batch；
Wherein, the cooling means of step c is double section section coolings, 6~10 seconds interval times.
Preferably, finish rolling start rolling temperature is 950 DEG C~1050 DEG C in the b step, and finishing temperature is 880 DEG C~920 DEG C；
D. the temperature in step is 600 DEG C~660 DEG C.
It is furthermore preferred that finish rolling start rolling temperature is 985~1050 DEG C in the b step, finishing temperature is 880 DEG C~895 DEG C；
D. the temperature in step is 605 DEG C~625 DEG C.
It is furthermore preferred that finish rolling start rolling temperature is 985~1050 DEG C in the b step, finishing temperature is 905 DEG C~915 DEG C；
D. the temperature in step is 635 DEG C~660 DEG C.
The embodiment of the present invention is further described with reference to embodiment, is not therefore limited the present invention
System is among the embodiment described scope.
Embodiment 1
The present embodiment rolls on 2050 Hot Rolling Mill of steel is climbed.Its production process is：Steel billet → hot rolling → laminar flow is cold
But → batch, the chemical component weight percentage of steel billet is：C：0.08%, Si：0.30%, Mn：1.31%, P：0.011%, S：
0.003%, V：0.08%, Cr：0.35%, Ni：0.12%, Cu：0.22%.Finish rolling start rolling temperature is 952 DEG C in hot-rolled step,
Finishing temperature is 882 DEG C in hot-rolled step；Double section cooling intervals 6 seconds in cooling step；It is 605 to batch the temperature in step
℃。
Measure the obtained weather-proof steel mechanical property of think gauge containing vanadium：Rel：460MPa, Rm：536MPa, A%：30%；Low temperature
Impact property (- 40 DEG C)：145J.
Embodiment 2
This example rolls on 2050 Hot Rolling Mill of steel is climbed.Its production process is：Steel billet → hot rolling → section cooling
→ batch, the chemical component weight percentage of steel billet is：C：0.10%, Si：0.40%, Mn：1.42%, P：0.010%, S：
0.005%, V：0.10%, Cr：0.38%, Ni：0.15%, Cu：0.25%.Finish rolling start rolling temperature is 1003 in hot-rolled step
DEG C, finishing temperature is 900 DEG C in hot-rolled step；Double section cooling intervals 8 seconds in cooling step；The temperature batched in step is
632℃。
Measure the obtained weather-proof steel mechanical property of think gauge containing vanadium：Rel：482MPa, Rm：545MPa, A%：29%；Low temperature
Impact property (- 40 DEG C)：128J.
Embodiment 3
This example rolls on 2050 Hot Rolling Mill of steel is climbed.Its production process is：Steel billet → hot rolling → section cooling
→ batch, the chemical component weight percentage of steel billet is：C：0.11%, Si：0.48%, Mn：1.45%, P：0.012%, S：
0.007%, V：0.12%, Cr：0.39%, Ni：0.16%, Cu：0.27%.Finish rolling start rolling temperature is 1048 in hot-rolled step
DEG C, finishing temperature is 918 DEG C in hot-rolled step；Double section cooling intervals 10 seconds in cooling step；Batch the temperature in step
For 657 DEG C.
Measure the obtained weather-proof steel mechanical property of think gauge containing vanadium：Rel：490MPa, Rm：563MPa, A%：27%；Low temperature
Impact property (- 40 DEG C)：103J.
Embodiment 4
The present embodiment rolls on 2050 Hot Rolling Mill of steel is climbed.Its production process is：Steel billet → hot rolling → laminar flow is cold
But → batch, the chemical component weight percentage of steel billet is：C：0.08%, Si：0.30%, Mn：1.31%, P：0.011%, S：
0.003%, V：0.08%, Cr：0.35%, Ni：0.12%, Cu：0.22%.Finish rolling start rolling temperature is 950 DEG C in hot-rolled step,
Finishing temperature is 880 DEG C in hot-rolled step；Double section cooling intervals 6 seconds in cooling step；It is 605 to batch the temperature in step
℃。
Measure the obtained weather-proof steel mechanical property of think gauge containing vanadium：Rel：492MPa, Rm：565MPa, A%：26%；Low temperature
Impact property (- 40 DEG C)：149J.
Embodiment 5
The present embodiment rolls on 2050 Hot Rolling Mill of steel is climbed.Its production process is：Steel billet → hot rolling → laminar flow is cold
But → batch, the chemical component weight percentage of steel billet is：C：0.08%, Si：0.30%, Mn：1.31%, P：0.011%, S：
0.003%, V：0.08%, Cr：0.35%, Ni：0.12%, Cu：0.22%.Finish rolling start rolling temperature is 1025 in hot-rolled step
DEG C, finishing temperature is 901 DEG C in hot-rolled step；Double section cooling intervals 7 seconds in cooling step；The temperature batched in step is
640℃。
Measure the obtained weather-proof steel mechanical property of think gauge containing vanadium：Rel：486MPa, Rm：558MPa, A%：27%；Low temperature
Impact property (- 40 DEG C)：153J.
Embodiment 6
The present embodiment rolls on 2050 Hot Rolling Mill of steel is climbed.Its production process is：Steel billet → hot rolling → laminar flow is cold
But → batch, the chemical component weight percentage of steel billet is：C：0.08%, Si：0.30%, Mn：1.31%, P：0.011%, S：
0.003%, V：0.08%, Cr：0.35%, Ni：0.12%, Cu：0.22%.Finish rolling start rolling temperature is 1050 in hot-rolled step
DEG C, finishing temperature is 919 DEG C in hot-rolled step；Double section cooling intervals 9 seconds in cooling step；The temperature batched in step is
655℃。
Measure the obtained weather-proof steel mechanical property of think gauge containing vanadium：Rel：471MPa, Rm：546MPa, A%：28%；Low temperature
Impact property (- 40 DEG C)：159J.
Comparative example 1
This comparative example rolls on 2050 Hot Rolling Mill of steel is climbed.Its production process is：Steel billet → hot rolling → laminar flow is cold
But → batch, the chemical component weight percentage of steel billet is：C：0.08%, Si：0.30%, Mn：1.31%, P：0.011%, S：
0.003%, V：0.08%, Cr：0.35%, Ni：0.12%, Cu：0.22%.Finish rolling start rolling temperature is 952 DEG C in hot-rolled step,
Finishing temperature is 882 DEG C in hot-rolled step；Cooling means uses 201310214275.0 cooling means：Laminar flow water cooling, into
810 DEG C of temperature of mouth, 20 DEG C/s of cooling velocity, it is 605 DEG C to batch the temperature in step.
Measure the obtained weather-proof steel mechanical property of think gauge containing vanadium：Rel：430MPa, Rm：522MPa, A%：17%；Low temperature
Impact property (- 40 DEG C)：32J.
The present invention does not add Mo and Al elements it can be seen from the result of embodiment 1-6, and the comprehensive performance of weathering steel is still
So preferably, especially low-temperature flexibility is very good.In addition, using the present invention it can be seen from the comparison of embodiment 1 and comparative example 1
Cooling technique, obtained weathering steel comprehensive performance greatly promotes.
Claims (7)
1. the weathering steel of think gauge containing vanadium, it is characterised in that the chemical component weight percentage of the weathering steel is：C：≤
0.12%, Si：≤ 0.50%, Mn：≤ 1.50%, P：≤ 0.02%, S：≤ 0.008%, V：≤ 0.12%, Cu：0.20%~
0.55%, Cr：0.35%~1.25%, Ni：0.10%~0.65%, remaining is Fe and inevitable impurity；
Wherein, thickness >=14mm of the weathering steel of think gauge containing vanadium；
The weathering steel of think gauge containing vanadium is prepared with the following method：
A. steel billet is smelted according to above-mentioned chemical composition；B. hot rolling；C. cool down；D. batch；
Wherein, the cooling means of step c is double section section coolings, 6~9 seconds interval times；
Finish rolling start rolling temperature is 950 DEG C~1050 DEG C in the b step, and finishing temperature is 880 DEG C~920 DEG C；Batch in step
Temperature be 600 DEG C~660 DEG C.
2. the weathering steel of think gauge containing vanadium according to claim 1, it is characterised in that the percentage by weight of the vanadium is：
0.07≤V≤0.12%.
3. the weathering steel of think gauge containing vanadium according to claim 1 or 2, it is characterised in that the weathering steel of think gauge containing vanadium
14~29mm of thickness.
4. the weathering steel of think gauge containing vanadium according to claim 3, it is characterised in that the thickness of the weathering steel of think gauge containing vanadium
Spend 14~20mm.
5. the weathering steel hot-rolling method of think gauge containing vanadium, it is characterised in that described method includes following steps：
A. steel billet is smelted according to the chemical composition described in claim 1 or 2；B. hot rolling；C. cool down；D. batch；
Wherein, the cooling means of step c is double section section coolings, 6~9 seconds interval times；
Finish rolling start rolling temperature is 950 DEG C~1050 DEG C in the b step, and finishing temperature is 880 DEG C~920 DEG C；D. in step
Temperature is 600 DEG C~660 DEG C.
6. the weathering steel of think gauge containing vanadium hot-rolling method according to claim 5, it is characterised in that finish rolling in the b step
Start rolling temperature is 985~1050 DEG C, and finishing temperature is 880 DEG C~895 DEG C；D. the temperature in step is 605 DEG C~625 DEG C.
7. the weathering steel of think gauge containing vanadium hot-rolling method according to claim 5, it is characterised in that finish rolling in the b step
Start rolling temperature is 985~1050 DEG C, and finishing temperature is 905 DEG C~915 DEG C；D. the temperature in step is 635 DEG C~660 DEG C.
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| CN114293099A (en) * | 2021-12-03 | 2022-04-08 | 石横特钢集团有限公司 | High-toughness weather-resistant section steel and production process method thereof |
| CN115354222A (en) * | 2022-08-09 | 2022-11-18 | 包头钢铁（集团）有限责任公司 | Thick-specification high-strength weather-resistant anti-seismic H-shaped steel and rolling method thereof |
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Application publication date: 20170118 Assignee: PANGANG GROUP PANZHIHUA STEEL & VANADIUM Co.,Ltd. Assignor: PANGANG GROUP PANZHIHUA IRON & STEEL RESEARCH INSTITUTE Co.,Ltd. Contract record no.: X2024980004384 Denomination of invention: Weathering steel with vanadium content and its rolling method Granted publication date: 20180501 License type: Common License Record date: 20240415 |
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