CN106337153A - Vanadium-containing thick-gauge weather resistant steel and rolling method thereof - Google Patents
Vanadium-containing thick-gauge weather resistant steel and rolling method thereof Download PDFInfo
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- CN106337153A CN106337153A CN201611008942.XA CN201611008942A CN106337153A CN 106337153 A CN106337153 A CN 106337153A CN 201611008942 A CN201611008942 A CN 201611008942A CN 106337153 A CN106337153 A CN 106337153A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 58
- 238000005096 rolling process Methods 0.000 title claims abstract description 58
- 239000010959 steel Substances 0.000 title claims abstract description 58
- 229910052720 vanadium Inorganic materials 0.000 title claims abstract description 47
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 title claims abstract description 47
- 238000000034 method Methods 0.000 title claims abstract description 22
- 239000012535 impurity Substances 0.000 claims abstract description 6
- 229910000870 Weathering steel Inorganic materials 0.000 claims description 48
- 238000001816 cooling Methods 0.000 claims description 40
- 238000005098 hot rolling Methods 0.000 claims description 20
- 239000000126 substance Substances 0.000 claims description 18
- 238000004458 analytical method Methods 0.000 claims description 7
- 241001062460 Retropinna semoni Species 0.000 claims description 6
- 229910001566 austenite Inorganic materials 0.000 description 15
- 229910052799 carbon Inorganic materials 0.000 description 9
- 238000004519 manufacturing process Methods 0.000 description 9
- 230000009194 climbing Effects 0.000 description 7
- 239000013078 crystal Substances 0.000 description 7
- 239000000203 mixture Substances 0.000 description 7
- 239000000047 product Substances 0.000 description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 150000004767 nitrides Chemical class 0.000 description 4
- 238000003466 welding Methods 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 229910052738 indium Inorganic materials 0.000 description 3
- 238000003801 milling Methods 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
- 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
- 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
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 229910052757 nitrogen 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
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 230000033764 rhythmic process Effects 0.000 description 1
- 238000007788 roughening Methods 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur 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
Abstract
The invention belongs to the technical field of steel and relates to weather resistant steel and a rolling method thereof, in particular to vanadium-containing thick-gauge weather resistant steel and a rolling method thereof. The vanadium-containing thick-gauge weather resistant steel is prepared from, by weight, 0.12% or smaller of C, 0.50% or smaller of Si, 1.5% or smaller of Mn, 0.02% or smaller of P, 0.008% or smaller of S, 0.12% or smaller of V, 0.20-0.55% of Cu, 0.30-1.25% of Cr, 0.10-0.65% of Ni, the balance Fe and inevitable impurities. The thickness of the vanadium-containing thick-gauge weather resistant steel is larger than or equal to 14 mm. The vanadium-containing thick-gauge weather resistant steel is good in tenacity, no Mo or Al is added, the components are simple, and the 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 iron and steel technical field.
Background technology
Weathering steel, also known as weather resisting steel, is by adding the alloys such as a certain amount of cu, p, cr, ni in ordinary steel
A kind of low-alloy steel that element is made.The feature of weathering steel is the corrosion that can resist under the conditions of natural atmosphere.
Chinese patent application 201310214275.0 discloses a kind of high-strength weathering steel, and 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%, balance of fe.It is in the composition of traditional weathering steel
Increased multiple microalloy element such as al, mo, v, nb, b and carry out composite alloying, reduce cu, p content in weathering steel, eliminate
Copper brittleness and the crisp harm of phosphorus that cu, p cause in weathering steel, improve intensity and the weather resistance of steel.Need al, mo, v, nb,
Multiple microalloy element such as b carries out composite alloying, and composition is more complicated, relatively costly.
Chinese patent application 201010113848.7 discloses a kind of weather-resistant steel plate, and the mass percent of its composition 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 there is preferable weldability, but it remains a need for adding
Al, mo element, complicated component, high cost.
Chinese patent application 201610285086.6 discloses a kind of 800mpa grade high-strength weathering 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%, balance of fe and inevitable impurity element.Its tensile strength >=900mpa, yield strength >=800mpa, prolong
Stretch rate >=18%, but it remains a need for adding al, mo element, complicated component, high cost.
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, and this contains vanadium think gauge
Weather-proof composition of steel is simple, good toughness.
For solving above-mentioned first technical problem, technical scheme is as follows:
The weathering steel of think gauge containing vanadium, chemical component weight percentage ratio 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:0.30%～1.25%,
Ni:0.10%～0.65%, remaining is fe and inevitable impurity；
Wherein, the thickness >=14mm of the described weathering steel of think gauge containing vanadium.
Preferably, the percentage by weight of vanadium is: 0.07≤v≤0.12%.
Further, the described weathering steel of think gauge containing vanadium is adopted and is prepared with the following method:
A. smelt steel billet 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 cooling, 6～10 seconds interval times.
Preferably, in described b step, finish rolling start rolling temperature is 950 DEG C～1050 DEG C, and finishing temperature is 880 DEG C～920 DEG C；
The temperature batched in step is 600 DEG C～660 DEG C.
Preferably, the thickness 14～29mm, more preferably 14～20mm of the described 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.
For solving above-mentioned second technical problem, technical scheme is as follows:
The weathering steel hot-rolling method of think gauge containing vanadium comprises the steps:
A. smelt steel billet 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 cooling, 6～10 seconds interval times.
Preferably, in described b step, finish rolling start rolling temperature is 950 DEG C～1050 DEG C, and finishing temperature is 880 DEG C～920 DEG C；
D. the temperature in step is 600 DEG C～660 DEG C.
Preferably, in described b step, finish rolling start rolling temperature is 985～1050 DEG C, and finishing temperature is 880 DEG C～895 DEG C；d.
Temperature in step is 605 DEG C～625 DEG C.
Preferably, in described b step, finish rolling start rolling temperature is 985～1050 DEG C, 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, without mo and al element, composition is simple, becomes
This is low.
The rolling mill practice of the present invention, by Controlled cooling process, using double sections of section cooling, 6～10 seconds interval times
Cooling technique, can effectively improve think gauge weathering steel structural homogenity, thus improving the combination property of thick weathering steel further.Energy
The weathering steel of think gauge containing vanadium of rolling more than 14mm thickness, has that rolling accepted product percentage is high, method is simple, low production cost, product
The advantages of product high comprehensive performance.
Specific embodiment
The weathering steel of think gauge containing vanadium of the present invention, chemical component weight percentage ratio 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:0.30%～
1.25%, ni:0.10%～0.65%, remaining is fe and inevitable impurity；
Wherein, the thickness >=14mm of the described weathering steel of think gauge containing vanadium.
In the weathering steel of hot tandem rolling thickness >=14mm specification, due to being limited by slab thickness, compression ratio is relatively
Little, structure refinement is more difficult, and section cooling is increasingly difficult to the structural homogenity control of think gauge thickness direction, leads to think gauge
Weathering steel cold impact value is low, mechanical property is low.Vanadium can play the effect of crystal grain thinning.
Vanadium mainly has a following effect to weathering steel:
(1) stop AUSTENITE GRAIN COARSENING: the raising with heating-up temperature and the prolongation of temperature retention time, austenite crystal will
More thick, and thick austenite is unfavorable to the processability of steel and fining ferrite.Add v can stop austenite crystal grain length
Greatly, improve the Coarsening Temperature of steel.This is because their carbon, the little particle of nitride diffusion can play fixing work to austenite grain boundary
With hindering the migration of austenite grain boundary, that is, preventing Austenite Grain Growth.
(2) fining ferrite grains: with the carrying out of rolling, temperature is gradually lowered, and the carbon of v, nitride are in austenite
Solubility product reduce, the effect of deformation-induced precipitation in addition, its carbon, nitride before austenite is to ferritic transformation disperse analysis
Go out, become ferritic nucleating agent, so that ferrite is formed in a large number under less degree of supercooling, be difficult to grow up, thus having refined ferrum
Ferritic crystal grain.
(3) raising austenite recrystallization temperature: v and carbon, the nitride dissolubility in austenite is larger, and temperature is relatively low
When, austenite is supersaturated solid solution, and now deformation can induce supersaturated austenite to precipitate；These tiny precipitate are relatively
Many austenite grain boundaries being distributed in deformation or subgrain nearby it is suppressed that crystal boundary migration and recrystallization is had and significant postpones effect
Really.Improve austenite recrystallization temperature, Unhydrated cement can be expanded, this is to highly useful in Unhydrated cement controlled rolling.
(4) improve the welding performance of steel: in use, welding point is its weak link, particularly heat affecting to steel
Area's destructible.Add micro v in steel, on the one hand, intensity can be improved while reducing carbon equivalent, thus improving steel
Welding performance；On the other hand, foreign body such as oxygen, nitrogen, sulfur etc. are fixed up, thus improving the solderability of steel；Secondly as
Its microcosmic particle undissolved property at high temperature, can stop the roughening of heat affected area crystal grain, improve the toughness of heat affected area, thus
Improve the welding performance of steel.
Preferably, the percentage by weight of vanadium is: 0.07≤v≤0.12%.
Further, the described weathering steel of think gauge containing vanadium is adopted and is prepared with the following method:
A. smelt steel billet 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 cooling, 6～10 seconds interval times.
In the weathering steel of hot tandem rolling thickness >=14mm specification, due to being limited by slab thickness, compression is smaller,
Structure refinement is more difficult, and section cooling is increasingly difficult to the structural homogenity control of think gauge thickness direction, leads to think gauge resistance to
Time steel cold impact value is low, mechanical property is low, and vanadium can play the effect of crystal grain thinning.But, the tissue of thickness direction is poor
Different still larger, the present invention studies cooling technique further, using double sections of section cooling, the cooling technique of 6～10 seconds interval times,
Think gauge weathering steel structural homogenity can be improved, thus improving the combination property of thick weathering steel further.
Temperature is too low, and rolling rhythm is too slow, low production efficiency, and temperature is too high, and operation of rolling rate of cooling is too fast, and tissue is not
Uniformly, low temperature impact properties are affected, finished product combination property is poor.Finish rolling start rolling temperature preferably 950 DEG C～1050 therefore 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, low intensity, low temperature impact properties are poor, therefore batch preferably 600 DEG C～660 DEG C of temperature in step.
Preferably, the thickness 14～29mm, more preferably 14～20mm of the described weathering steel of think gauge containing vanadium.
The weathering steel hot-rolling method of think gauge containing vanadium of the present invention comprises the steps:
A. smelt steel billet 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 cooling, 6～10 seconds interval times.
Preferably, in described b step, finish rolling start rolling temperature is 950 DEG C～1050 DEG C, 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 described 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 described b step, finishing temperature is 905 DEG C～915 DEG C；
D. the temperature in step is 635 DEG C～660 DEG C.
With reference to embodiment, the specific embodiment of the present invention is further described, therefore the present invention is not limited
System is among described scope of embodiments.
Embodiment 1
The present embodiment is rolling on climbing steel 2050 Hot Rolling Mill.Its production process is: steel billet → hot rolling → laminar flow is cold
But → batch, the chemical component weight percentage ratio 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%.In hot-rolled step, finish rolling start rolling temperature is 952 DEG C,
In hot-rolled step, finishing temperature is 882 DEG C；Double section cooling intervals 6 seconds in cooling step；Batching the temperature in step is 605
℃.
Measure the weather-proof steel mechanical property of think gauge containing vanadium obtaining: rel:460mpa, rm:536mpa, a%:30%；Low temperature
Impact property (- 40 DEG C): 145j.
Embodiment 2
This example is rolling on climbing steel 2050 Hot Rolling Mill.Its production process is: steel billet → hot rolling → section cooling
→ batch, the chemical component weight percentage ratio 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%.In hot-rolled step, finish rolling start rolling temperature is 1003
DEG C, in hot-rolled step, finishing temperature is 900 DEG C；Double section cooling intervals 8 seconds in cooling step；The temperature batched in step is
632℃.
Measure the weather-proof steel mechanical property of think gauge containing vanadium obtaining: rel:482mpa, rm:545mpa, a%:29%；Low temperature
Impact property (- 40 DEG C): 128j.
Embodiment 3
This example is rolling on climbing steel 2050 Hot Rolling Mill.Its production process is: steel billet → hot rolling → section cooling
→ batch, the chemical component weight percentage ratio 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%.In hot-rolled step, finish rolling start rolling temperature is 1048
DEG C, in hot-rolled step, finishing temperature is 918 DEG C；Double section cooling intervals 10 seconds in cooling step；Batch the temperature in step
For 657 DEG C.
Measure the weather-proof steel mechanical property of think gauge containing vanadium obtaining: rel:490mpa, rm:563mpa, a%:27%；Low temperature
Impact property (- 40 DEG C): 103j.
Embodiment 4
The present embodiment is rolling on climbing steel 2050 Hot Rolling Mill.Its production process is: steel billet → hot rolling → laminar flow is cold
But → batch, the chemical component weight percentage ratio 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%.In hot-rolled step, finish rolling start rolling temperature is 950 DEG C,
In hot-rolled step, finishing temperature is 880 DEG C；Double section cooling intervals 6 seconds in cooling step；Batching the temperature in step is 605
℃.
Measure the weather-proof steel mechanical property of think gauge containing vanadium obtaining: rel:492mpa, rm:565mpa, a%:26%；Low temperature
Impact property (- 40 DEG C): 149j.
Embodiment 5
The present embodiment is rolling on climbing steel 2050 Hot Rolling Mill.Its production process is: steel billet → hot rolling → laminar flow is cold
But → batch, the chemical component weight percentage ratio 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%.In hot-rolled step, finish rolling start rolling temperature is 1025
DEG C, in hot-rolled step, finishing temperature is 901 DEG C；Double section cooling intervals 7 seconds in cooling step；The temperature batched in step is
640℃.
Measure the weather-proof steel mechanical property of think gauge containing vanadium obtaining: rel:486mpa, rm:558mpa, a%:27%；Low temperature
Impact property (- 40 DEG C): 153j.
Embodiment 6
The present embodiment is rolling on climbing steel 2050 Hot Rolling Mill.Its production process is: steel billet → hot rolling → laminar flow is cold
But → batch, the chemical component weight percentage ratio 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%.In hot-rolled step, finish rolling start rolling temperature is 1050
DEG C, in hot-rolled step, finishing temperature is 919 DEG C；Double section cooling intervals 9 seconds in cooling step；The temperature batched in step is
655℃.
Measure the weather-proof steel mechanical property of think gauge containing vanadium obtaining: rel:471mpa, rm:546mpa, a%:28%；Low temperature
Impact property (- 40 DEG C): 159j.
Comparative example 1
This comparative example is rolling on climbing steel 2050 Hot Rolling Mill.Its production process is: steel billet → hot rolling → laminar flow is cold
But → batch, the chemical component weight percentage ratio 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%.In hot-rolled step, finish rolling start rolling temperature is 952 DEG C,
In hot-rolled step, finishing temperature is 882 DEG C；Cooling means adopts 201310214275.0 cooling means: laminar flow water cooling, enters
810 DEG C of temperature of mouth, 20 DEG C/s of rate of cooling, the temperature batched in step is 605 DEG C.
Measure the weather-proof steel mechanical property of think gauge containing vanadium obtaining: rel:430mpa, rm:522mpa, a%:17%；Low temperature
Impact property (- 40 DEG C): 32j.
The present invention be can be seen that without mo and al element by the result of embodiment 16, the combination property of weathering steel is still
So preferable, especially low-temperature flexibility is very good.Additionally, the present invention is adopted by embodiment 1 and relatively can be seen that of comparative example 1
Cooling technique, the weathering steel combination property obtaining greatly promotes.
Claims (9)
1. the weathering steel of think gauge containing vanadium is it is characterised in that the chemical component weight percentage ratio of described 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:0.30%～1.25%, ni:0.10%～0.65%, remaining is fe and inevitable impurity；
Wherein, the thickness >=14mm of the described weathering steel of think gauge containing vanadium.
2. the weathering steel of think gauge containing vanadium according to claim 1 is it is characterised in that the percentage by weight of described vanadium is:
0.07≤v≤0.12%.
3. the weathering steel of think gauge containing vanadium according to claim 1 and 2 is it is characterised in that described think gauge containing vanadium weathering steel
Adopt and prepare with the following method:
A. smelt steel billet according to the chemical analysis described in power 1 or 2；B. hot rolling；C. cool down；D. batch；
Wherein, the cooling means of step c is double section section cooling, 6～10 seconds interval times.
4. the weathering steel of think gauge containing vanadium according to claim 3 is it is characterised in that finish rolling start rolling temperature in described b step
For 950 DEG C～1050 DEG C, finishing temperature is 880 DEG C～920 DEG C；The temperature batched in step is 600 DEG C～660 DEG C.
5. the weathering steel of think gauge containing vanadium according to any one of Claims 1 to 4 is it is characterised in that described think gauge containing vanadium
Thickness 14～the 29mm of weathering steel, preferably 14～20mm.
6. the weathering steel hot-rolling method of think gauge containing vanadium is it is characterised in that methods described comprises the steps:
A. smelt steel billet according to the chemical analysis described in power 1 or 2；B. hot rolling；C. cool down；D. batch；
Wherein, the cooling means of step c is double section section cooling, 6～10 seconds interval times.
7. the weathering steel hot-rolling method of think gauge containing vanadium according to claim 5 is it is characterised in that finish rolling in described b step
Start rolling temperature is 950 DEG C～1050 DEG C, and finishing temperature is 880 DEG C～920 DEG C；D. the temperature in step is 600 DEG C～660 DEG C.
8. the weathering steel hot-rolling method of think gauge containing vanadium according to claim 6 is it is characterised in that finish rolling in described 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.
9. the weathering steel hot-rolling method of think gauge containing vanadium according to claim 6 is it is characterised in that finish rolling in described 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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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 |