CN102400053A - Steel plate with yield strength of 460MPa for building structure and manufacturing method thereof - Google Patents
Steel plate with yield strength of 460MPa for building structure and manufacturing method thereof Download PDFInfo
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- CN102400053A CN102400053A CN2010102766106A CN201010276610A CN102400053A CN 102400053 A CN102400053 A CN 102400053A CN 2010102766106 A CN2010102766106 A CN 2010102766106A CN 201010276610 A CN201010276610 A CN 201010276610A CN 102400053 A CN102400053 A CN 102400053A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 60
- 239000010959 steel Substances 0.000 title claims abstract description 60
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 24
- 238000005096 rolling process Methods 0.000 claims abstract description 24
- 239000000126 substance Substances 0.000 claims abstract description 11
- 238000005098 hot rolling Methods 0.000 claims abstract description 9
- 238000001816 cooling Methods 0.000 claims abstract description 8
- 239000012535 impurity Substances 0.000 claims abstract description 6
- 238000001953 recrystallisation Methods 0.000 claims abstract description 4
- 238000010438 heat treatment Methods 0.000 claims abstract description 3
- 238000000034 method Methods 0.000 claims description 23
- 239000004615 ingredient Substances 0.000 claims description 7
- 238000005496 tempering Methods 0.000 claims description 7
- 238000003723 Smelting Methods 0.000 claims description 4
- 238000009825 accumulation Methods 0.000 claims description 2
- 238000009749 continuous casting Methods 0.000 claims description 2
- 229910052799 carbon Inorganic materials 0.000 abstract description 9
- 229910052710 silicon Inorganic materials 0.000 abstract description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 5
- 229910052748 manganese Inorganic materials 0.000 abstract description 5
- 229910052719 titanium Inorganic materials 0.000 abstract description 5
- 229910052796 boron Inorganic materials 0.000 abstract description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract 2
- 229910052757 nitrogen Inorganic materials 0.000 abstract 1
- 229910052698 phosphorus Inorganic materials 0.000 abstract 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 10
- 239000000203 mixture Substances 0.000 description 6
- 238000010276 construction Methods 0.000 description 5
- 238000010791 quenching Methods 0.000 description 5
- 238000003466 welding Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 229910001563 bainite Inorganic materials 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- 229910052758 niobium Inorganic materials 0.000 description 3
- 230000000171 quenching effect Effects 0.000 description 3
- 238000007669 thermal treatment Methods 0.000 description 3
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 229910052804 chromium Inorganic materials 0.000 description 2
- 235000019362 perlite Nutrition 0.000 description 2
- 239000010451 perlite Substances 0.000 description 2
- 238000007670 refining Methods 0.000 description 2
- 244000000626 Daucus carota Species 0.000 description 1
- 241001062472 Stokellia anisodon Species 0.000 description 1
- 229910000746 Structural steel Inorganic materials 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 238000003556 assay Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 235000005770 birds nest Nutrition 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 229910001562 pearlite Inorganic materials 0.000 description 1
- 229910001568 polygonal ferrite Inorganic materials 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
- 235000005765 wild carrot Nutrition 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
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- Heat Treatment Of Steel (AREA)
Abstract
The invention discloses a steel plate for a building structure with 460 MPa-grade yield strength and a manufacturing method thereof, wherein the steel plate comprises the following chemical components in percentage by weight: 0.05 to 0.10 percent of C, 0.2 to 0.3 percent of Si, 1.40 to 1.60 percent of Mn, 0.025 to 0.060 percent of Nb0.025 to 0.060 percent of Ti, 0.015 to 0.030 percent of Als, 0.015 to 0.045 percent of Als, 0.2 to 0.4 percent of Cr0.10 to 0.30 percent of Mo0.0010 to 0.0020 percent of B, the balance of Fe and inevitable impurities, the content of impurity elements is controlled to be less than or equal to 0.015 percent of P, the content of S is less than or equal to 0.005 percent of N, the content of N is less than or equal to 0.0040 percent of O, and the content of O is less than or equal to 0. The manufacturing method comprises the steps that the heating temperature of a steel billet is 1180-1220 ℃, the initial rolling temperature of the first stage is 1040-1080 ℃, the final rolling temperature is 950-1000 ℃, and the initial rolling temperature of the second stage is 920-870 ℃; the final rolling temperature is controlled to be 800-850 ℃, and the rolling accumulated deformation of the second-stage recrystallization zone is more than 60%; after hot rolling, the steel is heated for more than 15 seconds, and then water cooling is carried out, wherein the starting temperature of the water cooling is 680-750 ℃, the cooling speed is 5-9 ℃/S, and the temperature of the red returning is 450-620 ℃. Simple chemical components, less than 0.40 of carbon equivalent, less than 0.80 of yield ratio and simple production process.
Description
Technical field
The present invention relates to a kind of 460MPa rank high-performance steel plate for building structure and method of manufacture thereof, belong to metal material field.
Background technology
In recent years, along with the steady-state growth of China's iron and steel output and going deep into of steelwork application technical research, steelwork has obtained widespread use at construction field; Increasingly high to HS, high-performance building structure with the demand of steel.
460MPa is the maximum intensity rank of the steel plate for building of present domestic use, uses 460MPa rank construction(al)steel to practice thrift rolled steel dosage 10%～20% than the 345MPa rank that generally adopts now, and market outlook are wide.In recent years, China has begun in priority projects such as Bird's Nest, to use the 460MPa construction(al)steel in batches, obtains good effect.
Other construction(al)steel production of domestic this level generally adopts low-carbon (LC) to cooperate the composition design of Nb, V, Ti microalloying, carries out normalizing treatment after the controlled rolling, or quenches at two-phase region after the hot rolling and carry out the working method of temper again.
The publication number of Capital Iron & Steel General Co's application is the patent of invention " a kind of super-thick steel plate for low yield ratio buildings with 460 MPa grade yield strength and method of manufacture " of CN101613828; Steel plate composition weight percent is: C0.14%～0.18%, and Si 0.35%-0.45%, Mn 1.40%～1.50%; Nb 0.025%～0.035%; V0.040%～0.050%, Ti 0.010%～0.020%, and all the other are iron Fe.Rolling technology: obtain >=the 80mm Plate Steel after adopting the controlled rolling of two stages.Thermal treatment process: two-phase region quenches, and the steel plate after the quenching carries out temper, finally obtains low yield strength ratio high-strength building steel plate.This method is applicable to >=the 80mm Plate Steel, and a large amount of in the actual production what use is the steel plate below the 80mm, and this method carbon equivalent is higher, and unfavorable to welding property, complex manufacturing must be quenched and tempering by two-phase region in addition, and cost is higher.
The publication number of Northeastern University's application is the patent of invention " a kind of method of manufacture of 460 MPa grade yield strength low-alloy high-tensile structural steel sheet material " of CN1537968.Main chemical compositions: C, Si, Mn, Nb, Ti, Als and Fe assembly; Its weight percent proportioning is: C 0.13%～0.20%, and Si 0.2%～0.5%, and Mn 1.30%～1.70%; Nb 0.01%～0.02%; Ti 0.005%～0.01%, and Als 0.005%～0.015%, and all the other are Fe; Rolling in two stages; Cool off fast after rolling; Obtain the heterogeneous structure of polygonal ferrite, perlite, acicular ferrite and little granular bainite; The consumption and the cost of micro alloying element are lower, but this process implementing example yield tensile ratio is all greater than 0.8, and low yield strength ratio is the important indicator of construction(al)steel; Embodiment rolls 10～18 ℃/s of back cooling rate, owing to will inevitably form very big unrelieved stress from the quick cooling of high temperature, and postwelding heat affected zone intensity can descend bigger.
The publication number of Japan JFE company application is the patent of invention " high-intensity high-tenacity low yield strength ratio ultra-large linear energy input welds with Plate Steel and working method thereof " of JP2005068478A, relates to chemical ingredients: C0.03%～0.15%, and Si 0.05%～0.5%; Mn 0.5%～3.0%, Cu＜1.5%, Ni＜2.0%; B0.0005%～0.003%, Al 0.005%～0.01%, after the hot rolling; Adopt 700～750 ℃ of two-phase regions to quench, the steel plate after the quenching carries out 400～550 ℃ of temper, the steel plate ys greater than 440MPa tensile strength greater than 570MPa; Can carry out the welding of 400KJ/cm super large energy, this patent composition and complex manufacturing, cost is higher.
Can know by above contrast patent, not enough below the production of 460MPa rank steel plate for building exists at present:
1. generally adopt after the hot rolling normalizing or two-phase region to quench to add tempering and handle, complex manufacturing, cost is higher;
2. carbon equivalent is higher, the welding difficulty;
3. control cold back yield tensile ratio greater than 0.80.
Summary of the invention
Deficiency in view of above-mentioned prior art the object of the present invention is to provide a kind of 460 MPa grade yield strength steel plate for building structure and method of manufacture thereof, and its chemical ingredients is simple, and carbon equivalent is easy to welding less than 0.40; Production technique is simple, through optimizing yield tensile ratio that cooling controlling and rolling controlling process makes steel plate less than 0.80; Need not use thermal treatment process such as normalizing or two-phase region quenching, performance satisfies the related request of national standard fully.
Steel chemical composition of the present invention is an essential characteristic to hang down one of low compound interpolation Mo of Nb of C or Cr, B; In the present invention; Its chemical ingredients scope (Wt%) is: C0.05%～0.10%, Si0.2%～～0.3%, Mn1.40%～1.60%, Nb0.025%～0.060%, Cr0.2～0.4%, Mo0.10～0.30%, B0.0010～0.0020%, Ti0.015%～0.030%, Als0.015%～0.045%, surplus are Fe and unavoidable impurities.Impurity element in the steel is controlled at P≤0.015%, S≤0.005%, [N]≤0.0040%, [O]≤0.0020%.For the intensity that guarantees steel and certain ferritic, content of pearlite in alloy need the C content more than 0.05%; Welding property and the low-temperature flexibility of while in order to guarantee steel; The content of C should not surpass 0.10%; The main effect of Si, Mn is solution strengthening and deoxidation, can make intensity too high in the time of too much, influences toughness simultaneously; It is grain growth when postponing recrystallization temperature and suppressing to heat simultaneously that Nb and Ti mainly act on, and also has the effect of solid solution and precipitation strength.It is the hardening capacity that improves steel that Cr or Mo, B mainly act on, and forms a certain amount of bainite structure, guarantees that ys is more than 460MPa.
The concrete production technique characteristic of steel of the present invention is following:
The technological process of production: steel-making-refining-casting-steel billet heating-two-stage controlled rolling-controlled chilling-(tempering)-finished product.
The smelting technology characteristic: carry out hot metal pretreatment, adopt converter smelting, through top blast or top bottom blowing, carry out refining treatment, and carry out microalloying, foreign matter content is in the mentioned component scope in the control steel; This patent is characterised in that will control molten steel [N]≤0.0040% if add B during refining, [O] thereby≤0.0020% make effective B content 0.0010%～0.0020%; Add the Ti microalloying, continuous casting adopts induction stirring, reduces element segregation.
The rolling technology characteristic: 1180～1220 ℃ of Heating temperatures before rolling, control are according to steel plate thickness 60～110 seconds/centimetre heat-up time; Adopt the controlled rolling of two stages, purpose is the tissue before the abundant refinement phase transformation, 1040～1080 ℃ of fs start rolling temperatures, and 950～1000 ℃ of finishing temperatures, the rolling beginning temperature of subordinate phase is controlled at 920～870 ℃; Finishing temperature is controlled at 800～850 ℃, and the rolling accumulation of distortion amount in subordinate phase recrystallization zone is greater than 60%; Roll the back water-cooled, water-cooled begins 680～750 ℃ of temperature, and 5～9 ℃/S of cooling rate returns 450～620 ℃ of red temperature; Characteristics of the present invention are the temperature of treating that will pass through after the hot rolling greater than 15 second time; Water-cooled then; To generate ferritic, perlite and bainite mixed structure, the yield tensile ratio that guarantees steel is below 0.80, and the ys that can control steel simultaneously is in the scope of GB regulation.
Thermal treatment process characteristic: in order to obtain best effect, the invention is characterized in and to carry out 500～650 ℃ of temper to the steel plate after the hot rolling that optimum tempering temperature is at 550～630 ℃.Through drawing process, can adjust the intensity of steel, improve the toughness and the plasticity of steel simultaneously.
The low yield strength ratio steel plate for building structure of producing by technique scheme has following beneficial effect:
1. ys is greater than 460N/mm
2
2. yield tensile ratio is less than 0.80;
3. production technique is simple, cools off with 5～9 ℃/s after the controlled rolling; As cooperate tempering can obtain better properties;
4. chemical ingredients is simple, and carbon equivalent is less than 0.40.
Embodiment
According to chemical ingredients of the present invention and production technique, smelt actual chemical ingredients of steel grade of the present invention such as table 1, the actual rolling technological parameter such as the table 2 of steel instance of the present invention, object performance assay of the present invention such as table 3, table 4.
The smelting composition instance of table 1, steel grade of the present invention, Wt%
The actual process parameter of table 2, steel instance of the present invention
The hot rolling attitude mechanical property of table 3 steel embodiment of the present invention
Table 4 steel of the present invention utilizes 1-1 test plate (panel) embodiment tempering experimental performance
Claims (6)
1. 460 MPa grade yield strength steel plate for building structure; The weight percent that it is characterized in that the steel plate chemical ingredients is: C0.05%～0.10%, Si0.2%～0.3%, Mn1.40%～1.60%, Nb0.025%～0.060%, Ti0.015%～0.030%, Als0.015%～0.045%; Also contain a kind of in Cr0.2%～0.4%, Mo0.10%～0.30%, B0.0010%～0.0020%; Surplus is Fe and unavoidable impurities, and the impurity element in the steel is controlled at P≤0.015%, S≤0.005%; [N]≤0.0040%, [O]≤0.0020%.
2. a kind of 460 MPa grade yield strength steel plate for building structure according to claim 1 is characterized in that described Nb0.045%～0.055%, Ti0.022%～0.026%.
3. method of manufacture that is used for claim 1 or 2 each described 460 MPa grade yield strength steel plate for building structure; Mainly comprise smelting, continuous casting and billet rolling; It is characterized in that: Heating temperature was 1180～1220 ℃ before steel billet rolled; 1040～1080 ℃ of fs start rolling temperatures, 950～1000 ℃ of finishing temperatures; The rolling beginning temperature of subordinate phase is controlled at 920～870 ℃; Finishing temperature is controlled at 800～850 ℃, and the rolling accumulation of distortion amount in subordinate phase recrystallization zone will be passed through the temperature of treating greater than 15 second time greater than 60% after the hot rolling; Water-cooled then; Water-cooled begins 680～750 ℃ of temperature, and 5～9 ℃/S of cooling rate returns 450～620 ℃ of red temperature.
4. the method for manufacture of a kind of 460 MPa grade yield strength steel plate for building structure according to claim 3 is characterized in that according to steel plate thickness 60～110 seconds/centimetre control steel billet heat-up time.
5. according to the method for manufacture of claim 3 or 4 described a kind of 460 MPa grade yield strength steel plate for building structure, it is characterized in that the steel plate after the hot rolling is carried out 500～650 ℃ of temper.
6. the method for manufacture of a kind of 460 MPa grade yield strength steel plate for building structure according to claim 5 is characterized in that tempering temperature is controlled at 550～630 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201010276610.6A CN102400053B (en) | 2010-09-07 | 2010-09-07 | Steel plate with yield strength of 460MPa for building structure and manufacturing method thereof |
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| CN201010276610.6A CN102400053B (en) | 2010-09-07 | 2010-09-07 | Steel plate with yield strength of 460MPa for building structure and manufacturing method thereof |
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| CN102400053A true CN102400053A (en) | 2012-04-04 |
| CN102400053B CN102400053B (en) | 2014-03-12 |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104313468A (en) * | 2014-11-14 | 2015-01-28 | 武汉钢铁(集团)公司 | Steel plate for 460MPa grade low-alloy high-strength structure and production method of steel plate |
| CN105200329A (en) * | 2015-09-11 | 2015-12-30 | 武汉钢铁(集团)公司 | Tensile strength-700MPa level easy-to-weld low-internal-stress structural steel plate and manufacturing method thereof |
| CN106636937A (en) * | 2016-10-08 | 2017-05-10 | 武汉钢铁股份有限公司 | Easy-to-weld structural steel with tensile strength in 600 MPa level and production method thereof |
| CN106834919A (en) * | 2016-12-22 | 2017-06-13 | 南京钢铁股份有限公司 | A kind of 460MPa grade high ductilities low-alloy high-strength structural steel plate and its production method |
| CN108220798A (en) * | 2018-03-22 | 2018-06-29 | 北京科技大学 | A kind of 460MPa grades of antidetonation fire-resistive construction steel and preparation method thereof |
| CN108374126A (en) * | 2018-04-17 | 2018-08-07 | 东北大学 | A kind of high intensity fine grain reinforcing bar and preparation method thereof |
| CN109913629A (en) * | 2019-01-02 | 2019-06-21 | 武汉钢铁有限公司 | A kind of yield strength 630MPa grades of easy welding structure steels and preparation method thereof |
| CN110724875A (en) * | 2019-09-20 | 2020-01-24 | 南京钢铁股份有限公司 | Steel plate for railway and manufacturing method for improving yield strength of steel plate |
| CN111172465A (en) * | 2020-02-28 | 2020-05-19 | 鞍钢股份有限公司 | Low-carbon equivalent large-thickness Q390GJ steel plate for building structure and manufacturing method thereof |
| CN112251569A (en) * | 2020-09-11 | 2021-01-22 | 南京钢铁股份有限公司 | Method for improving yield strength of Q460 grade high-strength steel plate |
| CN114686776A (en) * | 2022-03-31 | 2022-07-01 | 鞍钢股份有限公司 | 460 MPa-grade high-toughness extra-thick plate and manufacturing method thereof |
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