CN102181792A - Low-cost high-strength high-toughness shock-proof refractory steel and preparation technique thereof - Google Patents
Low-cost high-strength high-toughness shock-proof refractory steel and preparation technique thereof Download PDFInfo
- Publication number
- CN102181792A CN102181792A CN 201110080774 CN201110080774A CN102181792A CN 102181792 A CN102181792 A CN 102181792A CN 201110080774 CN201110080774 CN 201110080774 CN 201110080774 A CN201110080774 A CN 201110080774A CN 102181792 A CN102181792 A CN 102181792A
- Authority
- CN
- China
- Prior art keywords
- steel
- fire
- low
- cost
- rolling
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Heat Treatment Of Steel (AREA)
Abstract
The invention relates to a low-cost high-strength high-toughness shock-proof refractory steel and a preparation technique thereof. The steel comprises the following components in percentage by weight: 0.05-0.09% of C, 0.10-0.30% of Si, 0.60-1.00% of Mn, 0.20-0.40% of Mo, less than 0.10% of Cr, less than 0.10% of Cu, less than 0.10% of Ni, 0.02-0.04% of Nb, 0.01-0.04% of V, 0.01-0.04% of Ti, 0.02-0.04% of Al, at most 0.006% of N, at most 0.010% of P, at most 0.006% of S, and the balance of Fe and impurities. The preparation technique sequentially comprises the steps of temperature keeping, two-stage rolling and cooling. The steel provided by the invention adopts an Mo+Nb alloy system, and has the advantages of simple composition, low content of precious alloy elements, low alloy cost, high yield strength, favorable shock resistance and favorable impact toughness; and due to the adoption of the advanced controlled rolling and controlled cooling technologies, the cost of the technique is low.
Description
Technical field
The invention belongs to low-alloy high-strength steel and make the field, be particularly related to a kind of room temperature yield strength 〉=460MPa, yield tensile ratio≤0.80,600 ℃ of yield strength 〉=room temperature yield strengths 2/3 (promptly 〉=307MPa), and have good impelling strength (the low-cost fire-resistant steel and a preparation technology thereof of 0 ℃ of ballistic work 〉=47J).
Background technology
For large-scale steel construction, industry standard and standard-required strengthen the ability of opposing fire at steel construction surface-coated one deck fire protection coating.The sprayed fire proofing coating is time-consuming, and contaminate environment has prolonged the duration, has improved laid down cost.Development and use fire-resistant steel can attenuate or the cancellation fire-resistant coating to reduce laid down cost.The eighties, Japan company of Nippon Steel took the lead in releasing commercial refractory steel plates, by adding the steel plate that chromium (Cr), molybdenum (Mo), niobium alloying elements such as (Nb) have obtained ferrite and pearlitic structure, the yield strength in the time of its 600 ℃ remains on more than 2/3 of house temperature.Because architectural design and theory is different, up to the domestic construction that just gradually adopts fire-resistant steel to be used for steel construction at the end of the nineties.Especially after 9.11 New York World Trade Center disasters take place, the domestic little climax of using fire-resistant steel that started.Domestic each big steel company is all in the development of setting about fire-resistant steel and production at present, intensity rank is mainly based on room temperature yield strength 235 and 345MPa, alloy system is mainly with Mo+Nb, Mo+Cr+Nb and Mo+Cr+Nb+Ni (nickel) etc. are main, usually Mo content (weight percent) surpasses 0.50%, and cost of alloy is higher.Present fire-resistant steel development and the main direction of producing are exactly room temperature and the high-temperature behavior that improves constantly steel plate when constantly reducing cost of alloy.
The patent of invention of publication number CN1524976A has been put down in writing fire-resistant steel and the manufacture method thereof that a kind of room temperature yield strength is 235MPa and 345MPa, this steel adopts the Cr+Mo alloy system, be aided with copper (Cu), niobium (Nb), nickel (Ni), titanium (Ti), boron (B) and rare earth (REM) etc., and adopt controlled rolling+controlled chilling process combined to produce, but this fire-resistant hardness of steel rank is lower, and alloying element content height, composition complexity, the cost height.The patent of invention of publication number CN 101111621A provides a kind of yield strength 440MPa above high-strength fireproof steel and production method, and this steel adopts Mo+Nb alloy system (Mo 〉=0.50%) to be aided with the Q-tempering production technique, and yield tensile ratio 〉=0.8.The patent of invention of publication number JP2077523 also provides a kind of low-yield-ratio fire resistant steel and manufacture method thereof, room temperature surrender 235～440MPa, and yield tensile ratio≤0.80, but alloying element content is higher.The patent of invention of publication number CN101775552 provides a kind of room temperature yield strength 〉=460MPa, yield tensile ratio≤0.8, the fire-resistant preferably steel of obdurability collocation, but the expensive height of this Steel Alloy content, such as Mo (0.20～0.40%), Cr (0.25～0.40%), V (vanadium, 0.025～0.045%), Ni (0.15～0.35%), Cu (0.20～0.30%).The patent of invention of publication number CN101748336A has disclosed a kind of other low-yield-ratio fire resistant steel of room temperature yield strength 345MPa level, alloying element mainly comprises V (0.05-0.12%), Cr (0.10-0.60%) and Mo (0.20-0.40%) and boron (B), production method be 5～7 times rolling, every time depresses 1～7 millimeter, speed with 10～40 ℃/s after rolling is cooled to 550～650 ℃, and is incubated 1～2 hour, but this fire-resistant hardness of steel is on the low side and the complicated cost height of alloying constituent system.The fire-resistant and weather-resistant steel that it is 345MPa that the patent of invention of publication number CN101397627A has disclosed a kind of room temperature yield strength adopt Mo (0.30～0.42%)+Nb (0.015～0.035%)+Cu (0.20～0.27%) alloy system, but this hardness of steel is on the low side.The patent of invention of publication number CN1354273A has disclosed good but the fire-resistant and weather-resistant steel that alloying constituent content is higher of a kind of welding property, and its production method (controlled rolling+normalizing+tempering) is complicated too, and cost of alloy and technology cost are all higher.
Up to the present, (room temperature surrender 〉=460MPa), high tenacity, anti-seismic performance (yield tensile ratio≤0.8) and do not contain Cr, the fire-resistant product made from steel of valuable alloying element such as Ni does not appear in the newspapers to possess high strength simultaneously.
Summary of the invention
At the deficiencies in the prior art, the objective of the invention is to propose fire-resistant steel of high-intensity high-tenacity antidetonation and the preparation technology thereof of a kind of low cost (subtract Mo, do not contain Cr and Ni), this steel grades is simple, the high (room temperature strength 〉=460MPa of yield strength; 600 ℃ of intensity 〉=307MPa), anti-seismic performance good (yield tensile ratio≤0.8) also have good impelling strength, and cost of alloy and technology cost are all lower, are applicable to the construction steel structure of palace and the steel construction that requirement possesses fire-resistant function.
For achieving the above object, the present invention has adopted following technical scheme:
The chemical ingredients (weight percent) that fire-resistant ladle provided by the invention contains is: the Fe and the impurity element of C 0.05～0.09%, Si 0.10～0.30%, Mn 0.60～1.00%, Mo 0.20～0.40%, Cr＜0.10%, Cu＜0.10%, Ni＜0.10%, Nb 0.02～0.04%, V 0.01～0.04%, Ti 0.01～0.04%, Al0.02～0.04%, N≤0.006%, P≤0.010%, S＜0.006% and surplus.This composition does not add Cr, Ni and Cu element, and the foreign matter content that steelmaking process is introduced will control＜and 0.10%.
Below the effect of contained component among the present invention and consumption are selected to specify:
C: be to guarantee the necessary element of armor plate strength.Being lower than 0.03% can not proof strength, is higher than 0.10% base metal tenacity and HAZ toughness and reduces.Therefore C content is chosen in 0.06%～0.09%.
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 0.10%～0.30% 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 may make the deterioration center segregation.Therefore Mn content is chosen in 0.70%～1.00%.
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 Mo cost height, target component is controlled at about 0.30%, and scope is controlled at 0.20～0.40%.
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 0.015%～0.035%.
V: be to make V (C, the element of N) separating out can improve the intensity of steel plate.But if interpolation is excessive, then base metal tenacity and HAZ toughness reduce, so its content is controlled at 0.01%～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.
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 0.010%.
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 manufacture method of the fire-resistant steel of this high-intensity high-tenacity antidetonation, promptly adopts the method for controlled rolling+controlled chilling can make the steel plate that satisfies target capabilities (table 1).This technology is: adopt vacuum metling to obtain to have the molten steel of composition of the present invention, and be cast into steel billet; Behind ℃ insulation processing 2～3h of steel billet reheat to 1180～1230, carry out two stage rolling again, fs roughing draft 〉=0.5 wherein, subordinate phase finish rolling start rolling temperature is at 880 ± 20 ℃, draft 〉=0.6, promptly will roll plate with the speed of cooling of 5～15 ℃/s after rolling and be cooled to 500～600 ℃, air cooling makes target product then.
The target capabilities of the fire-resistant steel of table 1 antidetonation of the present invention
Compared with prior art, advantage of the present invention is at least: adopt the Mo+Nb alloy system, noble alloy element (only containing Mo, no Ni and Cr) content is few, and cost of alloy is low; Owing to adopted advanced controlled rolling and controlled cooling technology, the technology cost is also low in addition; COMPREHENSIVE CALCULATING, the production cost of fire-resistant steel provided by the invention is the most cheap.
Embodiment
Further specify technical scheme of the present invention below in conjunction with some preferred embodiments.
Embodiment 1: the chemical ingredients of present embodiment steel grade sees Table 2, and surplus is Fe and inevitably is mingled with that its preparation technology is: by the requirement of present embodiment steel grade chemical ingredients, adopt the 150kg vacuum induction furnace smelting to obtain molten steel; Molten steel watered build up steel ingot, be heated to 1180～1230 ℃ and be incubated 2～3 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 treat temperature on roller-way; Finish rolling begins 880 ℃ of temperature, and finishing temperature is at 860 ℃, and it is thick to roll into 20mm; Roll after rolling plate with the speed of 9 ℃/s be cooled to 500 ℃ then air cooling to room temperature, the target steel plate of system.Roll firm and hard material resources performance and see Table 3.
Embodiment 2: the chemical ingredients of present embodiment steel grade sees Table 2, and surplus is Fe and inevitably is mingled with that its preparation technology is: by the requirement of present embodiment steel grade chemical ingredients, vacuum induction is smelted and is obtained molten steel; Molten steel watered build up steel billet, it is rolling 1030 ℃ of beginnings to come out of the stove behind the heat tracing, and steel plate thickness is rolled to 75mm by 150mm; Treat that the temperature back is rolling 900 ℃ of beginnings, steel plate thickness is rolled to 30mm by 75mm; Air cooling is to room temperature after rolling plate after rolling and being cooled to 550 ℃ with the speed of 6 ℃/s, the target steel plate of system.Roll firm and hard material resources performance and see Table 3.
Embodiment 3: the chemical ingredients of present embodiment steel grade sees Table 2, and surplus is Fe and inevitably is mingled with that its preparation technology is similar substantially to embodiment 1-2, but behind its steel billet heat tracing, is rolling 1060 ℃ of beginnings, and steel ingot thickness is rolled to 80mm by 170mm; Treat temperature back 860 ℃ rolling, roll plate thickness and be rolled to 30mm by 80mm; Roll the back be cooled to 600 ℃ with the speed of 15 ℃/s after air cooling to room temperature, make the target steel plate.Roll firm and hard material resources performance and see Table 3.
This shows, the present invention adds by reducing alloying element, and collocation controlled rolling+technology for controlled cooling still can obtain room temperature yield strength 〉=460MPa, 600 ℃ of yield strength 〉=307MPa, the fire-resistant steel that the over-all properties of yield tensile ratio≤0.8,0 ℃ ballistic work 〉=47J is good.The fire-resistant steel of antidetonation of the present invention can be widely used in construction steel structure and other requires the field of steel structure of fire performance.
Claims (2)
1. fire-resistant steel of high strength and low cost high-ductility antidetonation, it is characterized in that, it comprises following component by weight percentage: C 0.05～0.09%, Si 0.10～0.30%, Mn 0.60～1.00%, Mo 0.20～0.40%, Cr＜0.10%, Cu:＜0.10%, Ni＜0.10%, Nb 0.02～0.04%, V 0.01～0.04%, Ti 0.01～0.04%, Al 0.02～0.04%, N≤0.006%, P≤0.010%, S≤0.006%, and Fe and impurity element.
2. the preparation technology of the fire-resistant steel of high strength and low cost high-ductility antidetonation according to claim 1, it is characterized in that, this technology is: will be heated to the steel billet that the fire-resistant steel of described antidetonation has a same composition after 1180～1230 ℃ of insulations handle 2～3h, carry out two stage rolling again, fs roughing draft 〉=0.5 wherein, subordinate phase finish rolling start rolling temperature is at 880 ± 20 ℃, draft 〉=0.6, to roll plate with the speed of cooling of 5～15 ℃/s after rolling and be cooled to 500～600 ℃, air cooling makes target product then.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110080774 CN102181792B (en) | 2011-04-01 | 2011-04-01 | Low-cost high-strength high-toughness shock-proof refractory steel and preparation technique thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110080774 CN102181792B (en) | 2011-04-01 | 2011-04-01 | Low-cost high-strength high-toughness shock-proof refractory steel and preparation technique thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102181792A true CN102181792A (en) | 2011-09-14 |
| CN102181792B CN102181792B (en) | 2013-06-12 |
Family
ID=44568076
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201110080774 Active CN102181792B (en) | 2011-04-01 | 2011-04-01 | Low-cost high-strength high-toughness shock-proof refractory steel and preparation technique thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102181792B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103882318A (en) * | 2014-03-03 | 2014-06-25 | 南京钢铁股份有限公司 | Molybdenum-saving type multi-component microalloy shock-resistant fire-resistant steel and preparation method of steel |
| CN107283034A (en) * | 2017-07-22 | 2017-10-24 | 首钢集团有限公司 | A kind of welding method of 460MPa grades of antidetonation fire-resistant and weather-resistant building structure |
| CN109182701A (en) * | 2018-11-08 | 2019-01-11 | 南京钢铁股份有限公司 | A kind of compound antidetonation fire-resistive construction steel and its manufacturing method |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101285153A (en) * | 2008-05-09 | 2008-10-15 | 攀钢集团成都钢铁有限责任公司 | Fire-resistant steel fire-resistant seamless steel pipe and production method thereof |
| CN101956147A (en) * | 2010-09-29 | 2011-01-26 | 江苏省沙钢钢铁研究院有限公司 | High-strength low-crack sensitive slab and manufacture method thereof |
-
2011
- 2011-04-01 CN CN 201110080774 patent/CN102181792B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101285153A (en) * | 2008-05-09 | 2008-10-15 | 攀钢集团成都钢铁有限责任公司 | Fire-resistant steel fire-resistant seamless steel pipe and production method thereof |
| CN101956147A (en) * | 2010-09-29 | 2011-01-26 | 江苏省沙钢钢铁研究院有限公司 | High-strength low-crack sensitive slab and manufacture method thereof |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103882318A (en) * | 2014-03-03 | 2014-06-25 | 南京钢铁股份有限公司 | Molybdenum-saving type multi-component microalloy shock-resistant fire-resistant steel and preparation method of steel |
| CN107283034A (en) * | 2017-07-22 | 2017-10-24 | 首钢集团有限公司 | A kind of welding method of 460MPa grades of antidetonation fire-resistant and weather-resistant building structure |
| CN109182701A (en) * | 2018-11-08 | 2019-01-11 | 南京钢铁股份有限公司 | A kind of compound antidetonation fire-resistive construction steel and its manufacturing method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102181792B (en) | 2013-06-12 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108796363B (en) | High-surface-quality aluminum-coated substrate steel suitable for large deformation and stamping and production method thereof | |
| CN113234995B (en) | Ultra-thick hot-rolled H-shaped steel with yield strength of 600MPa and production method thereof | |
| CN101906585B (en) | High-performance building structure refractory steel plates and manufacturing method thereof | |
| CN101928875A (en) | High-strength cold-rolled plate with favorable forming property and preparation method thereof | |
| CN109652733B (en) | 690 MPa-grade super-thick steel plate and manufacturing method thereof | |
| CN102400043B (en) | Large-thickness steel plate for oceaneering | |
| CN104928569A (en) | 800MPa grade high-ductility low-density steel and manufacturing method thereof | |
| CN102943212A (en) | NM500 high-strength wear-resistant steel plate and heat treatment technique thereof | |
| CN113249645B (en) | High-ductility and ultrahigh-strength ductile steel and preparation method thereof | |
| CN112813360B (en) | Low-carbon Cr-Ni-Al series high-strength and high-toughness corrosion-resistant steel and preparation method thereof | |
| CN103710633A (en) | V microalloyed Mo anti-seismic refractory steel and manufacturing method thereof | |
| CN105112782A (en) | Low-temperature ferrite LT-FH40 steel plate applied to hot-rolled ships and production method thereof | |
| CN105154784A (en) | High-phosphorus steel plate of weather-proof structure and method for preparing steel plate | |
| JP2020509165A (en) | Extra-thick steel material excellent in surface portion NRL-DWT physical properties and method for producing the same | |
| CN111187977B (en) | 690 MPa-grade anti-seismic, corrosion-resistant and fire-resistant medium-thickness plate steel and manufacturing method thereof | |
| CN101775552B (en) | High-strength high-flexibility low-yield-ratio fire resistant steel and production method thereof | |
| CN113528962A (en) | Corrosion-resistant steel bar and production method thereof | |
| CN103866188B (en) | Yield strength is 460MPa level fire-resistant corrosion-resistant anti-seismic steel for building and production method | |
| CN110592491B (en) | High-wear-resistance martensite/austenite dual-phase wear-resistant steel plate and manufacturing method thereof | |
| CN102644024A (en) | Low-alloy low-yield-ratio steel for oceaneering structure and production method thereof | |
| CN102181792B (en) | Low-cost high-strength high-toughness shock-proof refractory steel and preparation technique thereof | |
| CN113215499A (en) | Ultra-thick anti-seismic fire-resistant steel plate with 390 MPa-grade yield strength and manufacturing method thereof | |
| CN102560256B (en) | Fire-resistant weather-resistant steel with excellent low temperature toughness and preparation method for fire-resistant weather-resistant steel | |
| CN102851596A (en) | Fire resistant steel plate for 490 MPa grade building structure with low cost and manufacture method thereof | |
| CN104789870A (en) | Low-carbon silicon-manganese high-strength steel containing Cu and production method of steel |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |