CN102560256A - Fire-resistant weather-resistant steel with excellent low-temperature toughness and preparation process thereof - Google Patents
Fire-resistant weather-resistant steel with excellent low-temperature toughness and preparation process thereof Download PDFInfo
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- CN102560256A CN102560256A CN2012100486913A CN201210048691A CN102560256A CN 102560256 A CN102560256 A CN 102560256A CN 2012100486913 A CN2012100486913 A CN 2012100486913A CN 201210048691 A CN201210048691 A CN 201210048691A CN 102560256 A CN102560256 A CN 102560256A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 76
- 239000010959 steel Substances 0.000 title claims abstract description 76
- 230000009970 fire resistant effect Effects 0.000 title claims abstract description 33
- 238000002360 preparation method Methods 0.000 title claims description 4
- 238000005096 rolling process Methods 0.000 claims abstract description 14
- 239000000126 substance Substances 0.000 claims abstract description 9
- 238000003723 Smelting Methods 0.000 claims abstract description 6
- 239000012535 impurity Substances 0.000 claims abstract description 4
- 238000001816 cooling Methods 0.000 claims description 8
- 238000010438 heat treatment Methods 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 8
- 238000001953 recrystallisation Methods 0.000 claims description 7
- 238000005516 engineering process Methods 0.000 claims description 5
- 239000004615 ingredient Substances 0.000 claims description 5
- 238000005266 casting Methods 0.000 claims description 4
- 241001417490 Sillaginidae Species 0.000 claims description 3
- 238000002791 soaking Methods 0.000 claims description 3
- 229910000870 Weathering steel Inorganic materials 0.000 abstract description 6
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 229910052757 nitrogen Inorganic materials 0.000 abstract description 5
- 229910052804 chromium Inorganic materials 0.000 abstract description 4
- 229910052802 copper Inorganic materials 0.000 abstract description 4
- 229910052750 molybdenum Inorganic materials 0.000 abstract description 4
- 229910052758 niobium Inorganic materials 0.000 abstract description 4
- 229910052799 carbon Inorganic materials 0.000 abstract description 3
- 229910052748 manganese Inorganic materials 0.000 abstract description 3
- 229910052698 phosphorus Inorganic materials 0.000 abstract description 2
- 238000005098 hot rolling Methods 0.000 abstract 1
- 230000007797 corrosion Effects 0.000 description 6
- 238000005260 corrosion Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 238000003466 welding Methods 0.000 description 5
- 229910045601 alloy Inorganic materials 0.000 description 4
- 239000000956 alloy Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 238000005728 strengthening Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 229910001566 austenite Inorganic materials 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- 229910001257 Nb alloy Inorganic materials 0.000 description 1
- 241001062472 Stokellia anisodon Species 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 239000010953 base metal Substances 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 235000019362 perlite Nutrition 0.000 description 1
- 239000010451 perlite Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 238000005496 tempering Methods 0.000 description 1
- 238000009736 wetting Methods 0.000 description 1
- 230000003245 working effect Effects 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
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Abstract
The invention discloses a fire-resistant weathering steel with excellent low-temperature toughness, which comprises the following chemical components in percentage by weight: 0.01 to 0.04 percent of C, 0.15 to 0.25 percent of Si, 1.00 to 1.50 percent of Mn, 0.42 to 0.50 percent of Mo, 0.40 to 0.60 percent of Cr, 0.10 to 0.20 percent of Cu, 0.02 to 0.04 percent of Nb, 0.01 to 0.02 percent of Ti, less than or equal to 0.03 percent of Al, less than or equal to 0.006 percent of N, less than or equal to 0.01 percent of P, less than or equal to 0.006 percent of S, and the balance of Fe and inevitable impurities; the steel of the invention prepared by smelting and two-stage rolling has excellent fire resistance, weather resistance and low-temperature toughness. The fire-resistant weathering steel is delivered in a hot rolling state, has a simple production process, and can be widely applied to the fields of buildings, civil engineering, ocean structures and the like.
Description
Technical field
The invention belongs to the Low-Alloy Corrosion Resistant plate and make the field, the fire-resistant and weather-resistant steel that particularly a kind of low-temperature flexibility is excellent.
Background technology
Fire-resistant steel can increase the ability of buildings opposing fire, the security that improves buildings, and therefore fire-resistant steel has obtained application more and more widely in building trade.Japan Nippon Steel has taken the lead in disclosing the fire-resistant steel of ys between 235～440MPa that adopts the Mo+Nb alloy system, like CN101111621A, JP2077523; CN1524976A and CN101748336A disclose the fire-resistant steel between room temperature ys 235～345MPa, and CN101775552 (Baosteel) discloses other fire-resistant steel of 460MPa level subsequently, and the fire-resistant steel fire performance of foregoing invention is excellent, but does not all possess weather resistance.
Adopt weathering steel that prolonged its work-ing life, the fire-resistant and weather-resistant steel of therefore taking into account weather resistance and fire performance has also obtained extensive concern in building trade, especially the high-rise building field.Nippon Steel has developed fire-resistant and weather-resistant steel through a certain amount of Cu of extra interpolation, Ni and Cr on the basis of its fire-resistant steel, its trade mark is NSF400W and NSFR490W; But this steel grade brings difficulty up to 0.30% noble element Ni to application market.
CN101397627B (Comparative Examples 1) discloses other H shaped steel of a kind of ys 345MPa level or strip material fire-resistant and weather-resistant steel; This steel adopts the alloy system of Mo, Nb and Cu, and the weight percent of three kinds of compositions is respectively 0.30～0.42%, and 0.015～0.035% and 0.20～0.27%; This steel needs to adopt calcium to handle in smelting process; Tundish need adopt the special-purpose insulating covering agent of low-carbon (LC) in the casting process, production cost height and complex manufacturing, and this steel only possesses the room temperature impact property simultaneously.
CN1132958C (Comparative Examples 2) discloses the good fire-resistant and weather-resistant steel of a kind of welding property, but its working method adopts controlled rolling+normalizing+tempering, complex manufacturing, and cost of alloy is high, and only possesses 0 ℃ of impact property.
CN100455692C discloses a kind of excellent in low temperature toughness high-strength, and (weathering steel of ys >=665MPa) satisfy-40 ℃ of impelling strength requirements, but this steel grade does not possess fire performance.To sum up, the fire-resistant and weather-resistant steel that possesses low-temperature flexibility (satisfying-40 ℃ and following temperature shock toughness reguirements) does not also appear in the newspapers.
Summary of the invention
Deficiency to prior art; The objective of the invention is to propose the excellent fire-resistant and weather-resistant steel of a kind of low-temperature flexibility; Good, the excellent in low temperature toughness of this steel grade fire-resistant and weather-resistant performance, thus traditional fire-resistant steel or fire-resistant and weather-resistant steel solved because the low-temperature flexibility difference can not get the problem of widespread use in high building structure.
For realizing the foregoing invention purpose, the present invention has adopted following technical scheme:
The fire-resistant and weather-resistant steel that low-temperature flexibility provided by the invention is excellent; Its chemical ingredients is by weight percentage: C 0.01～0.04, Si 0.15～0.25, Mn 1.00～1.50, Mo 0.42～0.50, Cr 0.40～0.60, Cu 0.10～0.20, Nb 0.02～0.04, Ti 0.01～0.02, Al≤0.03, N≤0.006, P≤0.01, S≤0.006, surplus are Fe and unavoidable impurities.
Below the effect of contained component among the present invention and consumption are selected to specify:
C: can increase the intensity of steel plate on the one hand, then can low-temperature flexibility, weather resistance and the welding property of steel plate be had a negative impact but then.When C content≤0.04%, can significantly improve low-temperature flexibility and corrosion resistance nature for ferritic and the histioid steel grade of perlite; But when C content＜0.01%, the strength degradation of steel plate is very fast, also brings difficulty to steelmaking process simultaneously.Therefore the C content of steel plate of the present invention is controlled at 0.01～0.04%.
Si: in steel, play the solution strengthening effect, improve the intensity of steel plate, but damage its low-temperature flexibility and welding property.Therefore the content of Si is controlled in 0.15～0.25% the scope.
Mn: improve the hardening capacity of steel, and play the effect of solution strengthening and refinement ferrite crystal grain.When being lower than 0.5%, can't give full play to the effect that intensity is guaranteed.But the Mn too high levels is unfavorable to the welding property of steel, and possibly make the deterioration center segregation.Therefore Mn content is chosen in 1.00-1.50%.
Mo: be the effective element that improves steel hot strengths (solution strengthening), Mo content is high more, and its hot strength is high more.But the Mo cost is high, and target component is controlled at about 0.45%, and scope is controlled at 0.42～0.50%.
Cr: be one of most important element that improves steel atmospheric corrosion resistance ability; But too high levels then can worsen the steel plate welding property.Therefore its content is controlled at 0.40～0.60%.
Cu: be the important element that improves steel atmospheric corrosion resistance ability; Under the situation of not adding Ni,, too high levels influences lumber recovery thereby then can influencing the quality of strand.Therefore its content is controlled at 0.10～0.20%.
Nb: be the important element in the rolling controlled and cooling controlled steel, its adding can stop the recrystallize behind the austenite deformation, improves austenite recrystallization temperature.With the compound adding of Mo, can significantly improve the hot strength of Mo steel, but if excessively add Nb, then base metal tenacity and HAZ toughness reduce.Therefore its content is controlled at 0.02～0.04%.
It is fixed nitrogen and deoxidation that Ti, Al mainly act on.Ti/N is advisable between 2.5～3.5.Ti is the also stable tissue of heating once more except the precipitation strength effect, but its too high levels can make the toughness of steel descend.Al is deoxidation effectively, but too high levels can be damaged the toughness of steel.Therefore Al content is controlled at below 0.03%, and N is controlled at below 0.006%.
P: bring adverse influence can for the toughness of mother metal and the toughness of HAZ as impurity element, so its content should lack as much as possible, its content is controlled at and is not more than 0.01%.
S: thus be to form the element that MnS reduces ductility.For the Z that guarantees slab to performance, its content is controlled at≤0.006%.
The present invention also provides the preparation technology of the excellent fire-resistant and weather-resistant steel of this low-temperature flexibility, and this method may further comprise the steps:
(1) in smelting, casting operation, smelts, is cast into slab according to above-mentioned chemical component weight per-cent;
(2) in heating process, slab heating temperature is controlled between 1150～1200 ℃, soaking time 2～2.5 hours;
(3) in rolling process, in the recrystallization temperature scope, rolling total draft >=50%, single pass draft >=15%; In non-recrystallization zone, total draft >=60%, single pass draft >=15%;
(4) in refrigerating work procedure, roll the back air cooling to room temperature.
The finished product thickness that makes according to mentioned component and method is 16～40mm, steel plate room temperature ys>=325MPa, room temperature tensile strength>=520MPa; Elongation after fracture>=27%; 600 ℃ of high-temperature yield strength>=2/3* room temperature yss, yield tensile ratio≤0.80 ,-80 ℃ of Charpy-V impact power>=114J.
Compared with prior art, the outstanding feature that has of fire-resistant and weather-resistant steel of the present invention: 1) design of alloy is simple, and production cost is low; 2) ME is simple, i.e. controlled rolling is aided with air cooling just can obtain the finished product steel plate; 3) this steel plate possesses the performance of good fire-resistant and atmospheric corrosion resistance simultaneously, and each item performance all is superior to target capabilities, and concrete performance numerical value is seen embodiment table 1～table 3; 4) excellent in low temperature toughness ,-80 ℃ of ballistic work >=114J can be applicable to coastal or extremely cold geographic construction steel structure.
Description of drawings
Fig. 1 is the micro-organization chart of steel embodiment 1 of the present invention
Specific embodiments
Further specify the present invention below in conjunction with embodiment:
Embodiment 1: the chemical ingredients according to steel of the present invention requires to smelt; The chemical ingredients that obtains steel is seen as follows: C 0.03%, Si 0.21%, Mn 1.20%, Mo 0.42%, Cr 0.51%, Cu 0.16%, Nb 0.03%, Ti 0.016%, Al 0.025%, N 0.005%, P 0.0079%, S 0.004%, surplus is Fe and inevitably is mingled with.
Molten steel watered builds up steel ingot, (through forging into thickness 150mm steel billet) be heated to 1150 ℃ and be incubated 2～2.5 hours then, come out of the stove then and carry out roughing, draft 0.6 at 1100 ℃; Roughing finishes the thick plate that rolls of back 60mm and on roller-way, treats temperature; Finish rolling begins 870 ℃ of temperature, and finishing temperature is at 875 ℃, and it is thick to roll into 16mm; Roll the back air cooling to room temperature, the target steel plate of system.Roll firm and hard material resources performance and see table 1 ,-80 ℃ of Charpy-V impact power >=160J.Weather resistance is seen table 2, is superior to weathering steel SPA-H commonly used.
Embodiment 2: the chemical ingredients of smelting the acquisition steel with quadrat method according to above-mentioned instance is following: C 0.02%, Si 0.25%, Mn 1.30%, Mo 0.45%, Cr 0.48%, Cu 0.14%, Nb 0.02%, Ti 0.015%, Al 0.029%, N 0.0056, P 0.0077%, S 0.0017%, surplus is Fe and inevitably is mingled with.
With 1200 ℃ of slab heating and be incubated 2～2.5 hours, at 1060 ℃ of beginning rolling (steel billet thickness 160 → 75mm) of fs; Treat temperature back 860 ℃ rolling, roll plate thickness 75 → 24mm; Roll the back air cooling to room temperature, make the target steel plate.Roll firm and hard material resources performance and see table 1 ,-80 ℃ of Charpy-V impact power >=145J.Weather resistance is seen table 2, is superior to weathering steel SPA-H commonly used.
Table 1 embodiment steel plate mechanical property and the contrast of prior art steel
Table 2 embodiment steel plate weather resistance
Etching condition: corrosion test is the alternation of wetting and drying accelerated test, and corrosive environment is 0.01mol/LNaHSO
3Solution, temperature are 45 ± 2 ℃, relative humidity 70 ± 5%RH.
The target capabilities of the fire-resistant and weather-resistant steel that table 3 low-temperature flexibility is excellent
Through associative list 1～3, each item index of the present invention has all surpassed target capabilities, and the present invention adds through suitable alloying element, and the simple controlled rolling+air cooling technology of arranging in pairs or groups can obtain the excellent fire-resistant and weather-resistant steel of low-temperature flexibility.Because its good low-temperature flexibility, fire-resistant and weather-resistant steel of the present invention can be widely used in high-rise building and other field of steel structure that safety performance is had relatively high expectations.
Claims (5)
1. the excellent fire-resistant and weather-resistant steel of a low-temperature flexibility; Its chemical ingredients is by weight percentage: C 0.01～0.04, Si 0.15～0.25, Mn 1.00～1.50, Mo 0.42～0.50, Cr 0.40～0.60, Cu 0.10～0.20, Nb 0.02～0.04, Ti 0.01～0.02, Al≤0.03, N≤0.006, P≤0.01, S≤0.006, surplus are Fe and unavoidable impurities.
2. the fire-resistant and weather-resistant steel that low-temperature flexibility according to claim 1 is excellent; It is characterized in that: steel plate room temperature ys>=325MPa; Room temperature tensile strength>=520MPa, elongation after fracture>=27%, 600 ℃ high-temperature yield strength>=2/3* room temperature ys; Yield tensile ratio≤0.80 ,-80 ℃ of Charpy-V impact power>=114J.
3. the fire-resistant and weather-resistant steel that low-temperature flexibility according to claim 1 is excellent, it is characterized in that: steel plate finished product thickness scope is 16～40mm.
4. the fire-resistant and weather-resistant steel that low-temperature flexibility according to claim 1 is excellent is characterized in that preparing as follows:
(1) in smelting, casting operation, smelts, is cast into slab according to the described chemical component weight per-cent of claim 1;
(2) in heating process, slab heating temperature is controlled between 1150～1200 ℃, soaking time 2～2.5 hours;
(3) in rolling process, in the recrystallization temperature scope, rolling total draft >=50%, single pass draft >=15%; In non-recrystallization zone, total draft >=60%, single pass draft >=15%;
(4) in refrigerating work procedure, roll the back air cooling to room temperature.
5. the preparation technology of the fire-resistant and weather-resistant steel that a low-temperature flexibility is excellent is characterized in that:
(1) in smelting, casting operation, smelts, is cast into slab according to the described chemical component weight per-cent of claim 1;
(2) in heating process, slab heating temperature is controlled between 1150～1200 ℃, soaking time 2～2.5 hours;
(3) in rolling process, in the recrystallization temperature scope, rolling total draft >=50%, single pass draft >=15%; In non-recrystallization zone, total draft >=60%, single pass draft >=15%;
(4) in refrigerating work procedure, roll the back air cooling to room temperature.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105568139A (en) * | 2016-03-02 | 2016-05-11 | 河北敬业钢结构有限公司 | H-section steel and production method thereof |
| JP2019007063A (en) * | 2017-06-27 | 2019-01-17 | 新日鐵住金株式会社 | Steel for vacuum carburization and carburization component |
| CN112522638A (en) * | 2019-09-19 | 2021-03-19 | 宝山钢铁股份有限公司 | Fire-resistant weather-resistant steel plate/belt and production method thereof |
| WO2021052314A1 (en) * | 2019-09-19 | 2021-03-25 | 宝山钢铁股份有限公司 | Fire-resistant weathering steel plate/strip and manufacturing method therefor |
| RU2822600C1 (en) * | 2019-09-19 | 2024-07-09 | Баошан Айрон Энд Стил Ко., Лтд. | Fire-resistant steel strip, resistant to atmospheric effects, and method of manufacturing thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105568139A (en) * | 2016-03-02 | 2016-05-11 | 河北敬业钢结构有限公司 | H-section steel and production method thereof |
| JP2019007063A (en) * | 2017-06-27 | 2019-01-17 | 新日鐵住金株式会社 | Steel for vacuum carburization and carburization component |
| CN112522638A (en) * | 2019-09-19 | 2021-03-19 | 宝山钢铁股份有限公司 | Fire-resistant weather-resistant steel plate/belt and production method thereof |
| WO2021052314A1 (en) * | 2019-09-19 | 2021-03-25 | 宝山钢铁股份有限公司 | Fire-resistant weathering steel plate/strip and manufacturing method therefor |
| CN112522638B (en) * | 2019-09-19 | 2022-10-21 | 宝山钢铁股份有限公司 | Fire-resistant weather-resistant steel plate/belt and production method thereof |
| RU2822600C1 (en) * | 2019-09-19 | 2024-07-09 | Баошан Айрон Энд Стил Ко., Лтд. | Fire-resistant steel strip, resistant to atmospheric effects, and method of manufacturing thereof |
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| CN102560256B (en) | 2013-12-25 |
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Denomination of invention: Refractory and weathering steel with excellent low temperature toughness and its preparation process Effective date of registration: 20210901 Granted publication date: 20131225 Pledgee: China Construction Bank Zhangjiagang branch Pledgor: INSTITUTE OF RESEARCH OF IRON & STEEL,SHAGANG,JIANGSU PROVINCE Registration number: Y2021980008707 |
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