CN102952994B - Refractory anti-seismic construction steel and production method thereof - Google Patents
Refractory anti-seismic construction steel and production method thereof Download PDFInfo
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Abstract
The present invention relates to a kind of refractory anti-seismic construction steel, its chemical composition (by weight percentage) is: C:0.1-0.18%, Si:0.1-0.50%, Mn:1-1.80%, P≤0.025%, S≤0.015%, Cr≤0.50%, Mo≤0.30%, Al≤0.04%, N≤0.007%, Ca≤0.006%, and Nb≤0.050%, V≤0.055%, one or more in Ti≤0.035%, and Nb+V+Ti≤0.055%, Yu Weitie and inevitable impurity.Its manufacture method comprises: Heating temperature 1180 DEG C, insulation 3h, start rolling temperature >=1180 DEG C, and three roads, controlled rolling end add up draft >=35%, and finishing temperature is 860-900 DEG C, and after finish to gauge, Direct Air-Cooled is to room temperature, or with 5-15 DEG C/s cooling rate cool to room temperature.The steel obtained like this possesses excellent resistivity against fire, Rp
0.2(600 DEG C of yield strengths)/Rp
0.2(room-temperature yield strength)>=2/3, possesses low yield tensile ratio (yield tensile ratio Rp
0.2/ Rm≤0.75), anti-seismic performance is good.
Description
Technical field
The present invention relates to construction(al)steel, particularly relate to economical refractory anti-seismic construction steel extremely manufacture method.
Background technology
Current steel construction is low from heavy and light, foundation cost with it, short construction period, the challenge of large space can be solved, globality and shock resistance are better and the advantage such as the reproducible utilization of resource, be widely used in Highrise buildings and long span building, steel construction is with the obvious advantage, is also the developing direction of future architecture.But conventional steel structure there is deadly defect and fire endurance is low---easily soften under the hot environment after fire occurs and lose basic supporting capacity, seriously constraining the development of steel building.
Prior art has introduces refractory anti-seismic construction steel Patents, as CN1354273A discloses a kind of refractory anti-seismic construction steel and production method thereof.This steel is become a useful person after smelting, rolling, cooling, does not need follow-up thermal treatment process, just makes steel have high strength, high tenacity, excellent fire-resistant and weathering resistance.But precious metal alloys elements Mo content (0.35-1%), Cr content (0.3-0.8%) and Ni (0.1-1%) are all higher in its chemical composition, but also the trace elements such as additional Cu, Nb, V, Ti, Al, B, RE.Precious metal alloys component content is high, and alloying constituent is more complicated, all substantially increases the alloying cost of steel, thus limits widely using of refractory anti-seismic construction steel.
CN1970818A also discloses a kind of refractory anti-seismic construction steel and manufacture method thereof, wherein steel is based on C, Si, Mn, Mo (0.2-0.5%), Cr (0.3-0.6%) alloying element, additional Cu, Nb, V, Ni, Ti, Al, B, RE trace element.In these steel, the precious metal alloys constituent content such as Mo and Cr can be lower, but production process is too complicated, needs to adopt Quenching plus tempering process to produce after roll forming.
Therefore, be starved of and a kind of performance requriements that can meet refractory anti-seismic construction steel is provided, the economical fire-resistive construction steel can produced economically again.
Summary of the invention
The object of the present invention is to provide a kind of refractory anti-seismic construction steel.Such steel plate yield strength covers 235MPa to 460MPa rank, has 600 DEG C of excellent high-temperature behaviors, shows good fire performance.Yield tensile ratio≤0.75% of steel plate, carbon equivalent≤0.45%, steel plate has good welding property and anti-seismic performance.Suitable application area mainly steel building and other require the field of steel structure of fire performance.
For achieving the above object, refractory anti-seismic construction steel of the present invention, its chemical composition (by weight percentage) is: C:0.1-0.18%, Si:0.1-0.50%, Mn:1-1.80%, P≤0.025%, S≤0.015%, Cr≤0.50%, Mo≤0.30%, Al≤0.04%, N≤0.007%, Ca≤0.006%, and Nb≤0.030%, V≤0.035%, one or more in Ti≤0.035%, and Nb+V+Ti≤0.055%, Yu Weitie and inevitable impurity.
According to the present invention, yield strength 235MPa rank refractory anti-seismic construction steel, its chemical composition (by weight percentage) is: C:0.1-0.15%, Si:0.1-0.50%, Mn:1-1.40%, P≤0.025%, S≤0.015%, Cr≤0.50%, Mo≤0.20%, Al≤0.04%, N≤0.007%, Ca≤0.006%, and Nb≤0.050%, V≤0.055%, one or more in Ti≤0.035%, and Nb+V+Ti≤0.055%, Yu Weitie and inevitable impurity.
According to the present invention, yield strength 345MPa rank refractory anti-seismic construction steel, its chemical composition (by weight percentage) is: C:0.1-0.16%, Si:0.1-0.50%, Mn:1-1.60%, P≤0.025%, S≤0.015%, Cr≤0.50%, Mo≤0.30%, Al≤0.04%, N≤0.007%, Ca≤0.006%, and Nb≤0.050%, V≤0.055%, one or more in Ti≤0.035%, and 0.015%≤Nb+V+Ti≤0.055%, Yu Weitie and inevitable impurity.
According to the present invention, yield strength 420MPa rank refractory anti-seismic construction steel, its chemical composition is (by weight percentage): C 0.12-0.18%, Si 0.1-0.50%, Mn 1.1-1.80%, P≤0.025%, S≤0.015%, N≤0.007%, Cr≤0.55%, 0.10%≤Mo≤0.30%, Al≤0.04%, Ca≤0.006% and Nb≤0.050%, V≤0.055%, one or more in Ti≤0.035%, and 0.015%≤Nb+V+Ti≤0.055%, Yu Weitie and inevitable impurity.
Preferably, C:0.10-0.17%, preferably, C:0.10-0.16%, preferably, C:0.10-0.15%, more preferably C:0.103-0.15%.
Preferably, Si:0.10-0.45%, more preferably, Si:0.10-0.41%.
Preferably, Mn:1.01-1.6%, more preferably, Mn:1.03-1.6%.
Preferably, P≤0.015%.
Preferably, S≤0.01%, more preferably, S≤0.005%.
Preferably, Cr:0.15-0.50%.
Preferably, Mo:0.05-0.26%.
Preferably, Al:0.01-0.04%.
Preferably, Nb:0.010-0.04%, more preferably, Nb:0.010-0.035%.
Preferably, V:0.015-0.05%, more preferably, V:0.015-0.04%.
Preferably, Ti:0.010-0.03%, more preferably, Ti:0.010-0.02%.
Preferably, N:0.003-0.007%.
Preferably, Ca:0.0010%-0.0040%.
Another object of the present invention is to provide the manufacture method of above-mentioned fire-resistive construction steel, and the method comprises: desulfurizing iron, converter smelting, vacuum-treat, continuous casting, and strand is cleared up, and strand heats, controlled rolling and finishing; Wherein, Heating Steel Ingots temperature 1180 ± 30 DEG C, soaking time 3 ± 0.5h, start rolling temperature >=1180 DEG C, three roads, controlled rolling end add up draft >=35%, and finishing temperature is 860-900 DEG C, and after finish to gauge, Direct Air-Cooled is to room temperature, or with 5-15 DEG C/s cooling rate cool to room temperature.
Preferably, Heating Steel Ingots temperature 1170-1190 DEG C.
Steel of the present invention possesses excellent resistivity against fire, Rp
0.2(600 DEG C of yield strengths)/Rp
0.2(room-temperature yield strength)>=2/3.Possesses low yield tensile ratio (yield tensile ratio Rp
0.2/ Rm≤0.75), anti-seismic performance is good.Due to steel carbon equivalent of the present invention lower (Ceq≤0.45), therefore welding property is excellent.Steel mechanical property of the present invention contains Q235 to Q460 rank building structural steel.Steel chemical composition of the present invention is simple, with Nb, Ti, V microalloying (Nb+V+Ti≤0.055%), effectively reduces the yield tensile ratio of steel plate, makes steel plate obtain good shock resistance.Meanwhile, utilize precipitation strength and the solution strengthening of Nb, Ti, V, significantly reduce the content (Mo≤0.3%) of precious metal element Mo, improve 600 DEG C of yield strengths of steel plate, make steel plate obtain excellent fire performance.In addition, by reducing carbon content, improving the purity of steel, thus guaranteeing that this steel has good low-temperature flexibility.The production method of steel of the present invention easily controls, simple to operate, and after finish to gauge, Direct Air-Cooled is to room temperature, or with 5-15 DEG C/s cooling rate cool to room temperature.Do not need subsequent heat treatment after steel plate rolls, production cost is low, is applicable to scale production.
Embodiment
Below in conjunction with embodiment, the present invention is described in detail.
In order to obtain economical refractory anti-seismic construction steel, control composition system in such a way:
In the present invention, C content controls at 0.10-0.18%.Carbon is one of strengthening element of cheapness in steel, for ensureing that steel still obtain the room temperature strength of needs after rolling under air cooling technique, is defined as 0.10% under carbon content.But, when carbon content is too much, have a negative impact to the obdurability of steel coupling and weldability etc., thus carbon content on be defined as 0.18%.Preferably, C:0.10-0.15%, or C:0.10-0.16%, more preferably, C:0.11-0.15%.
In the present invention, Si content controls at 0.10-0.50%.Si is one of bioelement of deoxidation in steel making, and Si can improve the intensity of steel by solution strengthening mode, therefore the lower limit limiting Si is 0.10%.But Si has disadvantageous effect to weldability and toughness etc., must limit higher limit is 0.50%.Preferably, Si:0.10-0.45%, Si:0.12-0.45%, more preferably, Si:0.15-0.41%.
In the present invention, Mn content controls also to be one of the bioelement of deoxidation in steel making at 1-1.8%, Mn, and Mn guarantees that intensity is indispensable.For ensureing that steel obtains suitable intensity under air cooling technique, under it, be defined as 1.0%.But the welding property of Mn too high levels to steel has disadvantageous effect, and center segregation may be made more serious, steel plate intensity under water-cooling process may be caused higher, its upper limit is defined as 1.8% simultaneously.Preferably, Mn:1.0-1.6%, preferably, Mn:1.01-1.56, more preferably, Mn:1.03-1.55.
P content≤0.025%, S content≤0.015% in the present invention.S and P is the detrimental impurity element in steel, and too high levels can worsen the toughness of steel, therefore should reduce sulphur, phosphorus content in steel as far as possible.Preferably, P≤0.015%.Preferably, S≤0.01%, more preferably, S≤0.005%.
In the present invention, Cr content controls≤0.50%.Cr is the element improving hardening capacity, and the strong hardness of steel can be made to increase.But Cr too high levels will affect the toughness of steel, and cause temper brittleness, its upper limit will be 0.50%.Preferably, Cr:0.15-0.50%.
In the present invention, Mo content controls≤0.30%.Mo is the most effective element improving steel plate hot strength, and Mo content is higher, and its hot strength is higher.But Mo cost is higher, and cause steel weldability to reduce, thus Mo content is maximum controls 0.30%.Preferably, Mo:0.05-0.26%, more preferably, Mo:0.05-0.20%.
In the present invention, Nb content controls as≤0.050%.Nb is strong carboritride forming element, by separating out carboritride in roller repairing process, producing refined crystalline strengthening and precipitation strength and being used for the intensity of raising steel.In addition, the precipitate solvent temperature of Nb is higher, can improve steel plate the intensity of 600 DEG C, improve fire performance.Nb too high levels is little on high-temperature behavior impact, but may affect the toughness plasticity of steel, thus Nb on be defined as 0.050%.Preferably, Nb:0.010-0.04%, more preferably, Nb:0.010-0.035%.
In the present invention, Ti content controls as≤0.035%.Ti is a kind of strong carbonitride-forming elements, and its carbonitride has higher fusing point, has inhibition to growing up of austenite crystal during heating.And the precipitation in roller repairing process will improve the yield strength of steel, and favourable to the hot strength of steel plate.May be there is thick precipitation particles in Ti too high levels, it is defined as 0.035%.Preferably, Ti:0.010-0.03%, more preferably, Ti:0.010-0.02%.
In the present invention, V content controls as≤0.055%.V is strong carboritride forming element, and strengthening effect is similar to Nb, but effect is relatively little.Obviously worsen the low-temperature flexibility of steel when V content is higher, especially the toughness of welded heat affecting zone, it is 0.055% that its upper limit controls.Preferably, V:0.015-0.05%, more preferably, V:0.015-0.04%.
In the present invention, Ca content controls as≤0.006%.The Main Function of Ca in steel is the form and the distribution that improve steel medium sulphide content, thus is conducive to the low temperature impact properties improving steel plate.Preferably, Ca:0.0010%-0.0040%.
In the present invention, Al content controls≤0.040%.Al content is more low is more conducive to the hot strength improving steel.Al is one of effective deoxidant element, and can form nitride and carry out crystal grain thinning.But the Al content in increase steel will the toughness of infringement steel, also can reduce the hot strength of steel simultaneously, therefore and also the welding heat affected toughness that obtains also be deteriorated.Therefore the upper limit of Al is defined as 0.040%.Preferably, Al:0.01-0.04%.
In the present invention, N content controls at N≤0.007%.Usual N is the harmful element in steel, and N content is higher, will obviously worsen the low-temperature flexibility of steel plate, therefore N on be defined as 0.007%.N a small amount of in steel can contribute to separating out tiny nitride, is conducive to the fire performance improving steel plate.Preferably, N:0.003-0.007%.
By by desulfurizing iron → converter smelting → vacuum-treat → continuous casting → strand cleaning → strand heating → controlled rolling → finishing, wherein start rolling temperature controls more than 1180 DEG C, three roads, controlled rolling end add up draft more than 35%, finishing temperature is at 860-900 DEG C, after finish to gauge, Direct Air-Cooled is to room temperature, or with 5-15 DEG C/s cooling rate cool to room temperature, obtain above-mentioned economical refractory anti-seismic construction steel plate of the present invention.
Embodiment
Particularly, according to composition of steel requirement of the present invention, seven batches of steel of the present invention have been smelted at vacuum induction furnace, by Heating Steel Ingots temperature 1180 ± 10 DEG C, soaking time 3h, finish rolling open rolling thickness is three times of 60mm final thickness, and finishing temperature is 860-900 DEG C, after finish to gauge, air cooling is to room temperature, or with 5-15 DEG C/s cooling rate cool to room temperature.Embodiment steel plate is rolling 7 passage altogether, and the final thickness of steel plate is 20mm.
The chemical composition of the embodiment of the present invention is as shown in table 1.
Table 1
Test example 1: room temperature tensile properties
According to GB/T228 method, measure yield strength, tensile strength, the unit elongation of embodiment steel, its result is as shown in table 2.
Test example 2: impact property
Carry out impact property test according to GB/T229 to embodiment steel, its result is as shown in table 2.
The room temperature tensile properties of table 2 embodiment of the present invention steel
Test example 2:600 DEG C of high temperature tensile properties
According to GB/T4338 method, measure 600 DEG C of high temperature tensile properties (yield strength, tensile strength, unit elongation) of embodiment steel, its result is as shown in table 3.
600 DEG C of tensile properties of table 3 steel of the present invention
| Numbering | R p0.2/Mpa | Rm/MPa | R p0.2(600℃)/R p0.2(RT) | A/％ |
| 1 | 212 | 271 | 0.84 | 47 |
| 2 | 201 | 275 | 0.74 | 46 |
| 3 | 232 | 288 | 0.69 | 43 |
| 4 | 215 | 282 | 0.74 | 44 |
| 5 | 237 | 289 | 0.66 | 44 |
| 6 | 239 | 301 | 0.69 | 41 |
| 7 | 241 | 298 | 0.67 | 41 |
| 8 | 252 | 302 | 0.71 | 38 |
| 9 | 335 | 375 | 0.73 | 28 |
| 10 | 345 | 392 | 0.74 | 28 |
| 11 | 340 | 383 | 0.69 | 29 |
| 12 | 358 | 412 | 0.70 | 33 |
RT: room temperature.
As shown in Table 2, there is very low yield tensile ratio the foregoing invention steel capital, substantially below 0.75, is ensure that the yield tensile ratio that the anti-seismic performance of steel building requires is less than 0.8 far below building trade.Wherein, the yield strength of 1-4 invention steel can reach Q235 strength grade, and the yield strength of 5-8 steel can reach Q345 strength grade, and the yield strength of 9-12 steel can reach Q420 and above rank.In addition a steel capital is sent out in invention has good unit elongation (>=23%), and good 0 DEG C of ballistic work (>=80J), can meet the requirement of steel building to steel plate plasticity and impelling strength.Invention steel has good high temperature tensile properties at 600 DEG C, and the index Rp0.2 (600 DEG C)/Rp0.2 (room temperature) of fire performance is greater than 2/3, can reach the requirement of appropriate level refractory steel to high-temperature behavior.
Claims (19)
1. a refractory anti-seismic construction steel, its chemical composition is by weight percentage: C:0.103-0.18%, Si:0.1-0.50%, Mn:1-1.80%, P≤0.025%, S≤0.015%, Cr≤0.50%, Mo≤0.30%, Al≤0.04%, N≤0.007%, Ca≤0.006%, and Nb≤0.030%, V≤0.035%, one or more in Ti≤0.035%, and Nb+V+Ti≤0.055%, Yu Weitie and inevitable impurity;
Described steel is by comprising the method manufacture of following steps:
Heating temperature 1150-1210 DEG C, insulation 2.5-3.5h; Start rolling temperature >=1180 DEG C, three roads, controlled rolling end add up draft >=35%, and finishing temperature is 860-900 DEG C, and after finish to gauge, Direct Air-Cooled is to room temperature, or with 5-15 DEG C/s cooling rate cool to room temperature.
2. a refractory anti-seismic construction steel, its chemical composition is by weight percentage: C:0.103-0.15%, Si:0.1-0.50%, Mn:1-1.40%, P≤0.025%, S≤0.015%, Cr≤0.50%, Mo≤0.20%, Al≤0.04%, N≤0.007%, Ca≤0.006%, and Nb≤0.050%, V≤0.055%, one or more in Ti≤0.035%, and Nb+V+Ti≤0.055%, Yu Weitie and inevitable impurity;
Described steel is by comprising the method manufacture of following steps:
Heating temperature 1150-1210 DEG C, insulation 2.5-3.5h; Start rolling temperature >=1180 DEG C, three roads, controlled rolling end add up draft >=35%, and finishing temperature is 860-900 DEG C, and after finish to gauge, Direct Air-Cooled is to room temperature, or with 5-15 DEG C/s cooling rate cool to room temperature;
Described steel is yield strength 235MPa rank.
3. a refractory anti-seismic construction steel, its chemical composition is by weight percentage: C:0.103-0.16%, Si:0.1-0.50%, Mn:1-1.60%, P≤0.025%, S≤0.015%, Cr≤0.50%, Mo≤0.30%, Al≤0.04%, N≤0.007%, Ca≤0.006%, and Nb≤0.050%, V≤0.055%, one or more in Ti≤0.035%, and 0.015%≤Nb+V+Ti≤0.055%, Yu Weitie and inevitable impurity
Described steel is by comprising the method manufacture of following steps:
Heating temperature 1150-1210 DEG C, insulation 2.5-3.5h; Start rolling temperature >=1180 DEG C, three roads, controlled rolling end add up draft >=35%, and finishing temperature is 860-900 DEG C, and after finish to gauge, Direct Air-Cooled is to room temperature, or with 5-15 DEG C/s cooling rate cool to room temperature;
Described steel is yield strength 345MPa rank.
4. a refractory anti-seismic construction steel, its chemical feature is by weight percentage: C:0.12-0.18%, Si:0.1-0.50%, Mn:1.1-1.80%, P≤0.025%, S≤0.015%, Cr≤0.55%, 0.10%≤Mo≤0.30%, Al≤0.04%, N≤0.007%, Ca≤0.006% and Nb≤0.050%, V≤0.055%, one or more in Ti≤0.035%, and 0.015%≤Nb+V+Ti≤0.055%, Yu Weitie and inevitable impurity
Described steel is by comprising the method manufacture of following steps:
Heating temperature 1150-1210 DEG C, insulation 2.5-3.5h; Start rolling temperature >=1180 DEG C, three roads, controlled rolling end add up draft >=35%, and finishing temperature is 860-900 DEG C, and after finish to gauge, Direct Air-Cooled is to room temperature, or with 5-15 DEG C/s cooling rate cool to room temperature;
Described steel is yield strength 420MPa rank.
5. refractory anti-seismic construction steel as claimed in claim 1, is characterized in that, C:0.103-0.17%.
6. the refractory anti-seismic construction steel as described in as arbitrary in claim 1-4, is characterized in that, Si:0.10-0.45%.
7. the refractory anti-seismic construction steel as described in as arbitrary in claim 1-3, is characterized in that, Mn:1.01-1.4%.
8. the refractory anti-seismic construction steel as described in as arbitrary in claim 1-4, is characterized in that, P≤0.015%.
9. the refractory anti-seismic construction steel as described in as arbitrary in claim 1-4, is characterized in that, S≤0.01%.
10. the refractory anti-seismic construction steel as described in as arbitrary in claim 1-4, is characterized in that, Cr:0.15-0.50%.
11. as arbitrary in claim 1-3 as described in refractory anti-seismic construction steel, it is characterized in that, Mo:0.05-0.20%.
12. as arbitrary in claim 1-4 as described in refractory anti-seismic construction steel, it is characterized in that, Al:0.01-0.04%.
13. as arbitrary in claim 1-4 as described in refractory anti-seismic construction steel, it is characterized in that, Nb:0.010-0.03%.
14. as arbitrary in claim 1-4 as described in refractory anti-seismic construction steel, it is characterized in that, V:0.015-0.035%.
15. as arbitrary in claim 1-4 as described in refractory anti-seismic construction steel, certain is characterised in that, Ti:0.010-0.03%.
16. as arbitrary in claim 1-4 as described in refractory anti-seismic construction steel, it is characterized in that, N:0.003-0.007%.
17. as arbitrary in claim 1-4 as described in refractory anti-seismic construction steel, it is characterized in that, Ca:0.0010%-0.0040%.
18. as arbitrary in claim 1-4 as described in fire-resistive construction steel, its 600 DEG C of yield strength Rp
0.2with room-temperature yield strength Rp
0.2ratio>=2/3, yield tensile ratio Rp
0.2/ Rm≤0.75.
19. as arbitrary in claim 1-4 as described in fire-resistive construction steel, it is characterized in that, described method also comprises: desulfurizing iron, converter smelting, vacuum-treat, continuous casting and strand cleaning.
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| CN112981256A (en) * | 2021-02-09 | 2021-06-18 | 鞍钢股份有限公司 | Low-cost hot rolling production method of Q345D seamless steel tube |
| CN113564458B (en) * | 2021-06-28 | 2022-08-09 | 唐山钢铁集团有限责任公司 | Low-yield-strength fire-resistant anti-seismic building steel and production method thereof |
| CN114196886B (en) * | 2021-12-16 | 2023-03-28 | 四川远方高新装备零部件股份有限公司 | Low-yield-ratio anti-seismic YF927 steel for building and preparation method thereof |
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