CN1132958C - High-performance refractory weather-resisting building steel and its production method - Google Patents
High-performance refractory weather-resisting building steel and its production method Download PDFInfo
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- CN1132958C CN1132958C CN 01133562 CN01133562A CN1132958C CN 1132958 C CN1132958 C CN 1132958C CN 01133562 CN01133562 CN 01133562 CN 01133562 A CN01133562 A CN 01133562A CN 1132958 C CN1132958 C CN 1132958C
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 86
- 239000010959 steel Substances 0.000 title claims abstract description 86
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 17
- 239000004615 ingredient Substances 0.000 claims description 7
- 239000000126 substance Substances 0.000 claims description 7
- 238000000034 method Methods 0.000 claims description 4
- 238000005096 rolling process Methods 0.000 claims description 3
- 241001062472 Stokellia anisodon Species 0.000 claims description 2
- 238000005496 tempering Methods 0.000 claims description 2
- 238000003466 welding Methods 0.000 abstract description 22
- 229910052758 niobium Inorganic materials 0.000 abstract description 3
- 229910052720 vanadium Inorganic materials 0.000 abstract description 3
- 229910000851 Alloy steel Inorganic materials 0.000 abstract description 2
- 229910052796 boron Inorganic materials 0.000 abstract description 2
- 229910052804 chromium Inorganic materials 0.000 abstract description 2
- 229910052802 copper Inorganic materials 0.000 abstract description 2
- 229910052759 nickel Inorganic materials 0.000 abstract description 2
- 229910052757 nitrogen Inorganic materials 0.000 abstract description 2
- 229910052698 phosphorus Inorganic materials 0.000 abstract description 2
- 229910052782 aluminium Inorganic materials 0.000 abstract 1
- 229910052791 calcium Inorganic materials 0.000 abstract 1
- 229910052799 carbon Inorganic materials 0.000 abstract 1
- 229910052748 manganese Inorganic materials 0.000 abstract 1
- 229910052750 molybdenum Inorganic materials 0.000 abstract 1
- 229910052760 oxygen Inorganic materials 0.000 abstract 1
- 229910052710 silicon Inorganic materials 0.000 abstract 1
- 229910052717 sulfur Inorganic materials 0.000 abstract 1
- 229910052719 titanium Inorganic materials 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 7
- 230000000052 comparative effect Effects 0.000 description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 230000007797 corrosion Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 239000013078 crystal Substances 0.000 description 3
- 230000009970 fire resistant effect Effects 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 2
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 2
- 230000002411 adverse Effects 0.000 description 2
- 230000033228 biological regulation Effects 0.000 description 2
- 230000003749 cleanliness Effects 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 229910000859 α-Fe Inorganic materials 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 230000008485 antagonism Effects 0.000 description 1
- 229910001566 austenite Inorganic materials 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000002939 deleterious effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005098 hot rolling Methods 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
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- 229910052742 iron Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
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- 238000007669 thermal treatment Methods 0.000 description 1
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Abstract
The present invention relates to a high-performance refractory weather-resisting building steel and a production method thereof, which belongs to the field of manufacturing low alloy steel. The steel of the present invention contains C, Si, Mn, P, S, Mo, Ti, Al, N, O, Cr, Ni, Cu, Ca and B, and also contains at least one out of Nb, V and RE, and the remaining is Fe. The steel of the present invention achieves the advantages of high strength, high tenacity, superior refractory and weather resistance after smelted, rolled and processed in heat. The steel of the present invention is delivered in an untempered state, the production process is simple, and the steel of which the cost is low can be applied in various metallurgical enterprises. The present invention provides steel of which the thickness is from 4 to 100mm for various structural parts in the fields of buildings, civil engineering, sea structures, etc., and the heat affected zone (HAZ) of the steel still achieves superior toughness under the welding conditions with high linear energy (50-100 kJ/cm), such as gas-arc welding, electroslag welding and high frequency resistance welding, so that the welding efficiency of engineering structures is greatly improved, and the manufacturing cost is reduced.
Description
Affiliated technical field
The present invention relates to a kind of high-performance refractory weather-resisting building steel and production method thereof, belong to low alloy steel and make the field.
Background technology
Before the present invention, open flat 5-279735 patent " production method of the Fire-resistant Steels Used in Buildings plate that the large-line energy welding heat influence area toughness is good " just like disclosed spy in 1993, the related steel of this patent can bear the large-line energy welding, can satisfy the fireproof requirement, its weak point is weather resistance is not claimed.In addition, according to the requirement of this patent, only can produce the steel plate of thickness more than 50mm, be the following steel plate of 50mm and do not relate to thickness.
Summary of the invention
Purpose of the present invention aims to provide a kind of high-performance refractory weather-resisting building steel and production method thereof, can overcome the deficiency of prior art, the present invention is the steel plate of 4～100mm for the thickness that fields such as building, building and ocean structure provide, the various structural parts of making have good fire-resistant, weather resistance, and the heat affected zone still has good toughness when large-line energy welds, the production method that the present invention proposes is simple, and steel product cost is lower.
For achieving the above object, the present invention has designed a kind of high-performance refractory weather-resisting building steel, the chemical ingredients that it is characterized in that steel percentage ratio is by weight counted: C 0.01～0.15, Si≤0.55, Mn 0.50～1.60, P 0.074～0.150, S≤0.010, Mo 0.35～1.00, Ti 0.005～0.025, Al≤0.010, N 0.001～0.004, O 0.001～0.006, Cr 0.30～0.80, Ni 0.10～1.00, Cu 0.10～0.80, Ca 0.001～0.006, B≤0.0015, contain Nb≤0.030 in addition, V≤0.060, in RE≤0.020 one or more, surplus is Fe, and must satisfy B-0.435 * (N-Ti/3.4)≤0.0005%.
The qualification of the chemical ingredients of steel of the present invention be the reasons are as follows:
C is very important element to the hot strength of steel of the present invention, adds more than 0.01%, could effectively improve hot strength, but C content is too much, at the large-line energy welded heat affecting zone, just can not generate acicular ferrite (AF), so, with 0.15% the upper limit as C content.
Si is the element that adds for steel is carried out deoxidation, and Si content is many can to cause weldability and welding heat influence area toughness to worsen, thereby its upper limit is defined as 0.55%.
Mn is limited to 0.50% being indispensable element aspect the intensity of guaranteeing steel and the toughness under it; But Mn content is too much, and hardening capacity just will increase, thereby causes weldability and welding heat influence area toughness to worsen, thus regulation Mn on be limited to 1.60%.
P is the favourable element of antagonism atomospheric corrosion performance, but its toughness and thickness directional properties influence to steel plate is very big, so the upper limit of P is defined as 0.150% in steel of the present invention.
S is the same with P, to the toughness of steel plate and thickness directional properties influence greatly, so the content of S be controlled at≤0.010%.
Mo forms the carbonitride that disperse distributes in steel, can effectively improve hot strength, guarantees fire performance, and it is necessary that its lower limit is controlled at 0.35%; But the Mo too high levels will worsen weldability and welding heat influence area toughness, so its upper limit must be limited to 1.00%.
Ti exists with oxide form in steel, and its content must reach more than 0.005%, can improve Chinese People's Anti-Japanese Military and Political College's heat input welding property of steel like this; Its content is in case above 0.025%, can cause welding heat influence area toughness again and worsen, so its content range is limited to 0.005%～0.025%.
Al is the element that joins for deoxidation in the steel, but in the present invention, then is a kind of deleterious element, and the Al in the steel can combine with O, thereby can not generate the oxide compound of Ti, so concerning steel of the present invention, Al content should be controlled at below 0.010%.
N is for guaranteeing the necessary element of TiN, in order to ensure the TiN of needed minimum quantity, must contain the N more than 0.001%; But N content is many, and the solid solution N in the steel can cause welding heat influence area toughness to worsen again, so its content range is limited to 0.001%～0.004%.
O is the necessary element of oxide compound that generates Ti, and needed minimum content is 0.001%; When its content surpasses 0.006%, will reduce the cleanliness factor of steel, worsen the toughness of steel, so its content range should be limited to 0.001%～0.006%.
The content of Cr can effectively improve anti-macroclimate corrosive nature 0.30% when above; When its content surpasses 0.80%, will worsen welding property, so Cr content is limited to 0.30%～0.80%.
Ni improves the weathering resistance of steel and the favourable element of obdurability, can not cause disadvantageous effect to the weldability and the welding heat influence area toughness of steel, but be less than 0.10%, has little effect; Be higher than 1.00% cost that then can improve steel greatly, the economy that the steel forfeiture is had originally is so be defined as 1.00% with its upper limit.
Cu is except having the effect identical with the Ni cardinal principle, the precipitate of Cu improves the hot strength and the atmospheric corrosion resistance of steel in addition, in this case, Cu content is being necessary more than 0.10%, but,, will chap during hot rolling if surpass 0.80%, bring difficulty to production, so Cu content is limited to 0.10%～0.80% scope.
Ca has control sulfide (MnS) form, improves the effect that the summer ratio absorbs energy, improves low-temperature flexibility, but Ca content is less than at 0.001% o'clock, does not have practical function; And if surpass 0.006%, then can generate many CaO, CaS, and form large-scale inclusion, not only can have influence on the cleanliness factor of steel, toughness to steel causes damage, even can bring disadvantageous effect to weldability and anti-lamellar tearing, so the addition scope of regulation Ca is 0.001%～0.006%.
B is a surface active element, and is poly-very easily partially to crystal boundary, suppresses the forming core of proeutectoid ferrite effectively and grows up strongly inhibited γ-α phase transformation, the intensity of raising steel; The interaction of B and N can obviously improve the low-temperature flexibility of steel.But easily form carbide and the nitride of B during the B too high levels, and be collected at original austenite crystal prevention, impelling in the neighbourhood, dislocation desity increases, as the trap of hydrogen in partial area, thereby impel the crystal boundary cracking takes place herein, therefore, the B upper content limit is controlled at 0.0015%.
Of the present invention is further to improve performance, also optionally adds elements such as Nb, V, RE, can obtain better result aspect raising intensity and the toughness.
Nb can form fine carbonitride, improves the hot strength of steel, but content surpasses at 0.03% o'clock, then the large-line energy welding heat influence area toughness is had adverse influence.
V and Nb have same effect substantially, and its effect that improves high-temperature yield strength is poorer slightly than Nb, and content surpasses at 0.06% o'clock, then the large-line energy welding heat influence area toughness is had adverse influence.
The present invention also provides a kind of production method of high-performance refractory weather-resisting building steel, adopt ultrapure clean method to smelt, the chemical ingredients of acquisition steel percentage ratio is by weight counted: C 0.01～0.15, Si≤0.55, Mn 0.50～1.60, P 0.074～0.150, S≤0.010, Mo 0.35～1.00, Ti 0.005～0.025, Al≤0.010, N 0.001～0.004, O 0.001～0.006, Cr 0.30～0.80, Ni0.10～1.00, Cu 0.10～0.80, Ca 0.001～0.006, B≤0.0015, contain Nb≤0.030 in addition, V≤0.060, in RE≤0.020 one or more, surplus is Fe, and must satisfy B-0.435 * (N-Ti/3.4)≤0.0005%, it is characterized in that: in controlled rolling below 900 ℃, accumulative total draft 〉=48%, normalizing (890 ℃～950 ℃)+tempering (630～700 ℃) is adopted in finishing temperature≤830 ℃.
The present invention has following advantage:
1. steel of the present invention has good fire resistance properties, promptly guarantees high-yield strength (600 ℃ of σ s be not less than σ s under the room temperature 2/3) under 600 ℃ of high temperature.
2. steel of the present invention has good weather resistance, has added the element of weather-resistant performances such as Cu, P, Ni, Cr in steel, guarantees that its weather resistance is 2～8 times of common iron, and steel are longer duration of service, more can show its superiority.
3. steel of the present invention has good large-line energy, and (50～100kJ/cm) welding propertys can increase substantially the welding efficiency of steel construction.
4. steel of the present invention also has good comprehensive performances, and this steel has high strength, high tenacity, high Z simultaneously to performance, good fire resistance energy, weather resistance and welding property.
5. steel of the present invention is delivered goods with non-quality adjustment condition, and production technique is simple, and steel product cost is lower, all can implement at each smelter.
Embodiment
Embodiment 1: according to composition of steel requirement of the present invention, three stove steel have been smelted at vacuum induction furnace, steel ingot is heated to 1220 ℃ comes out of the stove rolling, rolled sheet material thickness is respectively 16mm, 40mm, 72mm, through 900 ℃ be incubated 45 minutes, 70 minutes, 100 minutes thermal treatment respectively after, the impelling strength of HAZ when having tested 0 ℃ behind the tensile property of normal temperature, 0 ℃ of impelling strength, 600 ℃ the tensile property and 30,60, the welding of 100kJ/cm large-line energy, and contrast with corresponding comparative steel, see Table 1.
The normal temperature tensile property and the comparative steel of steel of the present invention are in same level, but the impelling strength in the time of 0 ℃ is higher than compared steel, 30,60, when the 100kJ/cm large-line energy welds back 0 ℃ the impelling strength of HAZ especially apparently higher than compared steel, the salt-fog test result of steel of the present invention also is better than comparative steel (test period is 1080h, measures a year depth of corrosion (mm/a)).
As seen from Table 1, the chemical ingredients of steel of the present invention design is reasonable, the steel of production fire-resistant, weather-proof and when large-line energy welds the heat affected zone still have excellent in toughness.Steel of the present invention is delivered goods with non-quality adjustment condition, and production technique is simple, and steel product cost is lower, all can implement at each smelter, and can improve the welding efficiency of engineering structure greatly, reduces manufacturing cost.
The chemical ingredients of table 1 invention steel and compared steel and the contrast of HAZ impelling strength
| Invention steel 1 | Comparative steel | Invention steel 2 | Comparative steel | Invention steel 3 | Comparative steel | ||
| Composition | C | 0.05 | 0.15 | 0.07 | 0.16 | 0.08 | 0.17 |
| Si | 0.27 | 0.28 | 0.25 | 0.27 | 0.27 | 0.31 | |
| Mn | 1.29 | 1.30 | 1.11 | 1.33 | 1.32 | 1.36 | |
| P | 0.081 | 0.012 | 0.074 | 0.013 | 0.110 | 0.012 | |
| S | 0.010 | 0.013 | 0.008 | 0.009 | 0.007 | 0.011 | |
| Ti | 0.007 | -- | 0.010 | -- | 0.012 | -- | |
| B | 0.0007 | -- | 0.0009 | -- | 0.0006 | -- | |
| Al | 0.005 | 0.025 | 0.007 | 0.035 | 0.003 | 0.029 | |
| N | 0.0034 | 0.0038 | 0.0035 | 0.0042 | 0.0037 | 0.0040 | |
| Ni | 0.41 | -- | 0.47 | -- | 0.52 | -- | |
| Cr | 0.53 | -- | 0.41 | -- | 0.33 | -- | |
| Cu | 0.31 | -- | 0.35 | 0.14 | 0.45 | -- | |
| Mo | 0.34 | -- | 0.43 | -- | 0.57 | -- | |
| Ca | 0.003 | -- | 0.002 | -- | 0.004 | -- | |
| Nb | 0.009 | 0.017 | |||||
| V | 0.031 | -- | -- | -- | 0.046 | -- | |
| RE | -- | -- | 0.0031 | -- | 0.0014 | -- | |
| σ s/MPa | 395 | 375 | 420 | 390 | 450 | 405 | |
| σ b/MPa | 545 | 410 | 575 | 465 | 605 | 503 | |
| δ 5(％) | 23 | 22 | 27 | 21 | 29 | 26 | |
| A KV/J | 167 | 61 | 134 | 52 | 181 | 68 | |
| 600℃σ s/MPa | 290 | 235 | 310 | 210 | 324 | 222 | |
| Salt-fog test mm/a | 1.6887 | 3.5467 | 1.6851 | 3.7075 | 1.6923 | 3.8984 | |
Steel of the present invention is suitable as the steel of using in fields such as high level, superelevation layer, large span, the light light plate building of steel, building and ocean structure most.
Claims (2)
1, a kind of high-performance refractory weather-resisting building steel, the chemical ingredients that it is characterized in that steel percentage ratio is by weight counted: C 0.01～0.15, Si≤0.55, Mn 0.50～1.60, P 0.074～0.150, S≤0.010, Mo 0.35～1.00, Ti 0.005～0.025, Al≤0.010, N 0.001～0.004, O 0.001～0.006, Cr 0.30～0.80, Ni 0.10～1.00, Cu 0.10～0.80, Ca 0.001～0.006, B≤0.0015, contain Nb≤0.030 in addition, V≤0.060, in RE≤0.020 one or more, surplus is Fe, and must satisfy B-0.435 * (N-Ti/3.4)≤0.0005%.
2, a kind of production method of high-performance refractory weather-resisting building steel, adopt ultrapure clean method to smelt, the chemical ingredients of acquisition steel percentage ratio is by weight counted: C 0.01～0.15, Si≤0.55, Mn0.50～1.60, P 0.074～0.150, S≤0.010, Mo 0.35～1.00, Ti 0.005～0.025, Al≤0.010, N 0.001～0.004, O 0.001～0.006, Cr 0.30～0.80, Ni 0.10～1.00, Cu 0.10～0.80, Ca 0.001～0.006, B≤0.0015, contain Nb≤0.030 in addition, V≤0.060, in RE≤0.020 one or more, surplus is Fe, and must satisfy B-0.435 * (N-Ti/3.4)≤0.0005%, it is characterized in that: in controlled rolling below 900 ℃, accumulative total draft 〉=48%, normalizing (890 ℃～950 ℃)+tempering (630～700 ℃) is adopted in finishing temperature≤830 ℃.
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2001
- 2001-10-17 CN CN 01133562 patent/CN1132958C/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1296509C (en) * | 2005-03-10 | 2007-01-24 | 武汉钢铁(集团)公司 | High strength weldable ageing hardening steel and its production method |
| CN100345640C (en) * | 2005-08-31 | 2007-10-31 | 广州珠江钢铁有限责任公司 | Technology of producing Ti micro alloyed high weather resistant steel plate using thin plate blank continuous casting continuous milling process |
| CN100453679C (en) * | 2006-01-18 | 2009-01-21 | 株式会社神户制钢所 | Low yield ratio refractory steel |
| CN100455692C (en) * | 2006-12-08 | 2009-01-28 | 武汉钢铁(集团)公司 | A kind of production method of high-strength weathering steel |
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