CN106521352A - Niobium-containing heavy gauge weathering steel and rolling method thereof - Google Patents
Niobium-containing heavy gauge weathering steel and rolling method thereof Download PDFInfo
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- CN106521352A CN106521352A CN201611008189.4A CN201611008189A CN106521352A CN 106521352 A CN106521352 A CN 106521352A CN 201611008189 A CN201611008189 A CN 201611008189A CN 106521352 A CN106521352 A CN 106521352A
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- 239000010955 niobium Substances 0.000 title claims abstract description 67
- 229910052758 niobium Inorganic materials 0.000 title claims abstract description 57
- 229910000870 Weathering steel Inorganic materials 0.000 title claims abstract description 54
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 title claims abstract description 47
- 238000005096 rolling process Methods 0.000 title claims abstract description 45
- 238000000034 method Methods 0.000 title claims abstract description 25
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 44
- 239000010959 steel Substances 0.000 claims abstract description 44
- 238000001816 cooling Methods 0.000 claims description 34
- 238000005098 hot rolling Methods 0.000 claims description 17
- 239000000126 substance Substances 0.000 claims description 15
- 229910052698 phosphorus Inorganic materials 0.000 claims description 13
- 229910052802 copper Inorganic materials 0.000 claims description 11
- 229910052717 sulfur Inorganic materials 0.000 claims description 10
- 229910052804 chromium Inorganic materials 0.000 claims description 8
- 235000019628 coolness Nutrition 0.000 claims description 8
- 229910052748 manganese Inorganic materials 0.000 claims description 8
- 229910052759 nickel Inorganic materials 0.000 claims description 8
- 238000004458 analytical method Methods 0.000 claims description 6
- 239000012535 impurity 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 12
- 229910052799 carbon Inorganic materials 0.000 description 9
- 238000004519 manufacturing process Methods 0.000 description 9
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 8
- 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 4
- 150000004767 nitrides Chemical class 0.000 description 4
- 238000003466 welding Methods 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 3
- 238000003801 milling Methods 0.000 description 3
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- 238000001556 precipitation Methods 0.000 description 3
- 238000001953 recrystallisation Methods 0.000 description 3
- 229910052720 vanadium Inorganic materials 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
- 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
- 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
- 229910052796 boron Inorganic materials 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
- 238000005259 measurement Methods 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
- 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
- 239000011593 sulfur Substances 0.000 description 1
- 238000004781 supercooling Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 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
- C22C38/18—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
- 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
- C21D8/0263—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment following 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
- C22C38/02—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
- C22C38/18—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
Abstract
The invention relates to a weathering steel and a rolling method thereof, concretely relates to a niobium-containing heavy gauge weathering steel and a rolling method thereof, and belongs to the technical field of steel. The niobium-containing heavy gauge weathering steel comprises, by weight, 0.08% or less of C, 0.50% or less of Si, 1.50% or less of Mn, 0.02% or less of P, 0.008% or less of S, 0.05% or less of Nb, 0.20-0.55% of Cu, 0.30-1.25% of C and 0.10-0.65% of Ni, wherein the thickness of the niobium-containing heavy gauge weathering steel is not less than 16 mm. The niobium-containing heavy gauge weathering steel has the advantages of good toughness, no Mo or Al elements, simple components and low cost.
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 niobium and its milling method, category
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 made by element.The characteristics of weathering steel is to resist the corrosion 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.Which is in the composition of traditional weathering steel
Increased various microalloy elements such as Al, Mo, V, Nb, B carries out composite alloying, reduces Cu, P content in weathering steel, eliminates
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,
Various microalloy elements such as B carry 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 which remains a need for addition
Al, Mo element, complicated component, 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%, balance of Fe and inevitable impurity element.Its tensile strength >=900MPa, yield strength >=800MPa prolong
Rate >=18% is stretched, but which remains a need for adding Al, Mo element, complicated component, 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 niobium, and this contains niobium 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 niobium, it is characterised in that the chemical component weight percentage ratio of the weathering steel is：C：≤
0.08%, Si：≤ 0.50%, Mn：≤ 1.50%, P：≤ 0.02%, S：≤ 0.008%, Nb：≤ 0.05%, Cu：0.20%～
0.55%, Cr：0.30%～1.25%, Ni：0.10%～0.65%, remaining is Fe and inevitable impurity；
Wherein, the thickness >=16mm of the weathering steel of think gauge containing niobium.
Preferably, the percentage by weight of niobium is：0.02≤Nb≤0.04%.
Further, the weathering steel of think gauge containing niobium is adopted and 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, in the b step, finish rolling start rolling temperature is 920 DEG C～1000 DEG C, and finishing temperature is 840 DEG C～880 DEG C；
It is 555 DEG C～585 DEG C to batch the temperature in step.
Preferably, the 16～29mm of thickness, more preferably 16～22mm of the weathering steel of think gauge containing niobium.
Second technical problem to be solved by this invention is to provide a kind of weathering steel hot-rolling method of think gauge containing niobium, 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 niobium comprises the 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；
Thickness >=the 16mm of the weathering steel of think gauge containing niobium for preparing.
Preferably, in the b step, finish rolling start rolling temperature is 920 DEG C～1000 DEG C, and finishing temperature is 840 DEG C～880 DEG C；
It is 555 DEG C～585 DEG C to batch the temperature in step.
It is furthermore preferred that finish rolling start rolling temperature is 985～1000 DEG C in the b step, finishing temperature is 865 DEG C～880 DEG C；
D. the temperature in step is 555 DEG C～585 DEG C.
It is furthermore preferred that finish rolling start rolling temperature is 985～1000 DEG C in the b step, finishing temperature is 865 DEG C～880 DEG C；
D. the temperature in step is 555 DEG C～585 DEG C.
Beneficial effect：The weathering steel good toughness of think gauge containing niobium of the present invention, without Mo and Al elements, composition 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 combination property of thick weathering steel.Energy
The weathering steel of think gauge containing niobium of rolling more than 16mm thickness, with 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 niobium of the present invention, chemical component weight percentage ratio is：C：≤ 0.08%, Si：≤ 0.50%,
Mn：≤ 1.50%, P：≤ 0.02%, S：≤ 0.008%, Nb：≤ 0.05%, Cu：0.20%～0.55%, Cr：0.30%～
1.25%, Ni：0.10%～0.65%, remaining is Fe and inevitable impurity；
Wherein, the thickness >=16mm of the weathering steel of think gauge containing niobium.
In hot tandem rolling thickness >=16mm specification weathering steels, due to being limited by slab thickness, compress 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
Time steel cold impact value is low, mechanical property is low.Niobium, vanadium can play a part of crystal grain thinning.
Niobium mainly has following effect to weathering steel：
(1) prevent AUSTENITE GRAIN COARSENING：With the raising and the prolongation of temperature retention time of heating-up temperature, austenite crystal will
It is more thick, and thick austenite is unfavorable to the processability of steel and fining ferrite.Add Nb prevent austenite crystal
Grow up, improve the Coarsening Temperature of steel.This is austenite grain boundary to be risen and be fixed due to their carbon, the little particle of nitride diffusion
Effect, hinders the migration of austenite grain boundary, that is, prevents Austenite Grain Growth.
(2) fining ferrite grains：As the carrying out of rolling, temperature are gradually lowered, the carbon of Nb, nitride are in austenite
Solubility product reduce, the effect of deformation-induced precipitation in addition, its carbon, nitride are analysed to disperse before ferritic transformation in austenite
Go out, become ferritic nucleating agent, ferrite is formed under less degree of supercooling in a large number, be difficult to grow up, so as to refine ferrum
Ferritic crystal grain.
(3) improve austenite recrystallization temperature：The dissolubility of Nb and carbon, nitride in austenite is larger, and temperature is relatively low
When, austenite is supersaturated solid solution, and now deformation can induce supersaturated austenite that precipitation occurs；These tiny precipitate compared with
Many is distributed near the austenite grain boundary or subgrain of deformation, it is suppressed that crystal boundary migration and effect is postponed with significant to recrystallization
Really.Austenite recrystallization temperature is improved, 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 most destructible.Add micro Nb 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, sulfur etc. are fixed up, so as to improve the solderability of steel；Next, by
In its microcosmic particle undissolved property at high temperature, the roughening of heat affected area crystal grain can be prevented, improve the toughness of heat affected area, from
And improve the welding performance of steel.
Preferably, the percentage by weight of niobium is：0.02≤Nb≤0.05%.
Further, the weathering steel of think gauge containing niobium is adopted and 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 hot tandem rolling thickness >=16mm specification weathering steels, due to being limited by slab thickness, compress 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
Time steel cold impact value is low, mechanical property is low.Niobium can play a part of crystal grain thinning.But, the tissue of thickness direction is poor
Different still larger, the present invention further studies cooling technique, 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 combination property of thick weathering steel.
Temperature is too low, and rolling rhythm is too slow, and low production efficiency, temperature are 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.Therefore finish rolling start rolling temperature preferably 920 DEG C～1000 in b step
DEG C, preferably 840 DEG C～880 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 555 DEG C～585 DEG C of the temperature in step.
Preferably, the 16～29mm of thickness, more preferably 16～22mm of the weathering steel of think gauge containing niobium.
The weathering steel hot-rolling method of think gauge containing niobium of the present invention comprises the 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；
Thickness >=the 16mm of the weathering steel of think gauge containing niobium for preparing.
Preferably, in the b step, finish rolling start rolling temperature is 920 DEG C～1000 DEG C, and finishing temperature is 840 DEG C～880 DEG C；
It is 555 DEG C～585 DEG C to batch the temperature in step.
It is furthermore preferred that finish rolling start rolling temperature is 985～1000 DEG C in the b step, finishing temperature is 865 DEG C～880 DEG C；
D. the temperature in step is 555 DEG C～585 DEG C.
It is furthermore preferred that finish rolling start rolling temperature is 985～1000 DEG C in the b step, finishing temperature is 865 DEG C～880 DEG C；
D. the temperature in step is 555 DEG C～585 DEG C.
The specific embodiment of the present invention is further described with reference to embodiment, not therefore by present invention limit
System is among described scope of embodiments.
Embodiment 1
The present embodiment is rolled 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 ratio of steel billet is：C：0.05%, Si：0.30%, Mn：1.30%, P：0.014%, S：
0.005%, Nb：0.035%, Cr：0.38%, Ni：0.13%, Cu：0.25%.In hot-rolled step, finish rolling start rolling temperature is 925
DEG C, in hot-rolled step, finishing temperature is 842 DEG C；Double section cooling intervals 6 seconds in cooling step；The temperature batched in step is
543℃。
The weather-proof steel mechanical property Rel of think gauge containing niobium of this method production：462MPa, Rm：532MPa, A%：35%；It is low
Warm impact property (- 40 DEG C)：293J.
Embodiment 2
This example is rolled 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 ratio of steel billet is：C：0.06%, Si：0.40%, Mn：1.39%, P：0.013%, S：
0.004%, Nb：0.043%, Cr：0.34%, Ni：0.14%, Cu：0.26%.In hot-rolled step, finish rolling start rolling temperature is 965
DEG C, in hot-rolled step, finishing temperature is 865 DEG C；Double section cooling intervals 8 seconds in cooling step；The temperature batched in step is
570℃。
The weather-proof steel mechanical property Rel of think gauge containing niobium of this method production：482MPa, Rm：545MPa, A%：33%；It is low
Warm impact property (- 40 DEG C)：274J.
Embodiment 3
This example is rolled 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 ratio of steel billet is：C：0.08%, Si：0.49%, Mn：1.48%, P：0.013%, S：
0.007%, Nb：0.050%, Cr：0.35%, Ni：0.13%, Cu：0.25%.In hot-rolled step, finish rolling start rolling temperature is 1000
DEG C, in hot-rolled step, finishing temperature is 878 DEG C；Double section cooling intervals 10 seconds in cooling step；Batch the temperature in step
For 600 DEG C.
The weather-proof steel mechanical property Rel of think gauge containing niobium of this method production：495MPa, Rm：565MPa, A%：31%；It is low
Warm impact property (- 40 DEG C)：265J.
Comparative example 1
This comparative example is rolled 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 ratio of steel billet is：C：0.05%, Si：0.30%, Mn：1.30%, P：0.014%, S：
0.005%, Nb：0.035%, Cr：0.38%, Ni：0.13%, Cu：0.25%.In hot-rolled step, finish rolling start rolling temperature is 925
DEG C, in hot-rolled step, finishing temperature is 842 DEG C；Cooling means adopts 201310214275.0 cooling means：Laminar flow water cooling,
810 DEG C of inlet temperature, 20 DEG C/s of rate of cooling, it is 543 DEG C to batch the temperature in step.
The weather-proof steel mechanical property of think gauge containing niobium that measurement is obtained：Rel：450MPa, Rm：531MPa, A%：20%；Low temperature
Impact property (- 40 DEG C)：52J.
The present invention can be seen that without Mo and Al elements by the result of embodiment 13, the combination property of weathering steel is still
So preferably, especially low-temperature flexibility is very good.Additionally, adopting the present invention by embodiment 1 with relatively can be seen that for comparative example 1
Cooling technique, the weathering steel combination property for obtaining greatly promotes.
Claims (9)
1. the weathering steel of think gauge containing niobium, it is characterised in that the chemical component weight percentage ratio of the weathering steel is：C：≤
0.08%, Si：≤ 0.50%, Mn：≤ 1.50%, P：≤ 0.02%, S：≤ 0.008%, Nb：≤ 0.05%, Cu：0.20%～
0.55%, Cr：0.30%～1.25%, Ni：0.10%～0.65%, remaining is Fe and inevitable impurity；
Wherein, the thickness >=16mm of the weathering steel of think gauge containing niobium.
2. the weathering steel of think gauge containing niobium according to claim 1, it is characterised in that the percentage by weight of the niobium is：
0.02≤Nb≤0.05%.
3. the weathering steel of think gauge containing niobium according to claim 1 and 2, it is characterised in that the weathering steel of think gauge containing niobium
Adopt and prepare with the following method：
A. steel billet is smelted 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 coolings, 6～10 seconds interval times.
4. the weathering steel of think gauge containing niobium according to claim 3, it is characterised in that finish rolling start rolling temperature in the b step
For 920 DEG C～1000 DEG C, finishing temperature is 840 DEG C～880 DEG C；It is 555 DEG C～585 DEG C to batch the temperature in step.
5. the weathering steel of think gauge containing niobium according to any one of Claims 1 to 4, it is characterised in that the think gauge containing niobium
16～the 29mm of thickness of weathering steel, preferably 16～22mm.
6. the weathering steel of think gauge containing niobium hot-rolling method, it is characterised in that methods described comprises the steps：
A. steel billet is smelted 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 coolings, 6～10 seconds interval times；
Thickness >=the 16mm of the weathering steel of think gauge containing niobium for preparing.
7. the weathering steel of think gauge containing niobium hot-rolling method according to claim 6, it is characterised in that finish rolling in the b step
Start rolling temperature is 920 DEG C～1000 DEG C, and finishing temperature is 840 DEG C～880 DEG C；It is 555 DEG C～585 to batch the temperature in step
℃。
8. the weathering steel of think gauge containing niobium hot-rolling method according to claim 7, it is characterised in that finish rolling in the b step
Start rolling temperature is 985～1000 DEG C, and finishing temperature is 865 DEG C～880 DEG C；D. the temperature in step is 555 DEG C～585 DEG C.
9. the weathering steel of think gauge containing niobium hot-rolling method according to claim 7, it is characterised in that finish rolling in the b step
Start rolling temperature is 985～1000 DEG C, and finishing temperature is 865 DEG C～880 DEG C；D. the temperature in step is 555 DEG C～585 DEG C.
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| CN110616375A (en) * | 2019-10-21 | 2019-12-27 | 攀钢集团攀枝花钢铁研究院有限公司 | Niobium-vanadium-containing 550 MPa-grade thick weathering steel and production method thereof |
| CN110699612A (en) * | 2019-08-20 | 2020-01-17 | 北京科技大学 | Rare earth-containing niobium microalloyed high-strength weather-resistant angle steel and production process thereof |
| CN110699598A (en) * | 2019-08-20 | 2020-01-17 | 北京科技大学 | Niobium microalloyed high-strength high-weather-resistance angle steel and production process thereof |
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Application publication date: 20170322 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: Thick specification weathering steel containing niobium and its rolling method Granted publication date: 20180710 License type: Common License Record date: 20240415 |