CN102676919A - Method for cooling low-alloy hot-rolled H-shaped steel with yield strength of 550MPa after rolling - Google Patents
Method for cooling low-alloy hot-rolled H-shaped steel with yield strength of 550MPa after rolling Download PDFInfo
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Abstract
The invention discloses a method for cooling a low-alloy hot-rolled H-shaped steel with yield strength of 550MPa after rolling, wherein the low-alloy hot-rolled H-shaped steel with the yield strength of 550MPa comprises following components by mass: 0.13-0.18% of C, 0.30-0.50% of Si, 1.40-1.60% of Mn, not more than 0.025% of P, not more than 0.025% of S, 0.10-0.12% of V, 0.010-0.014% of N, 0.003-0.030% of Als, and the balance of iron and residual trace impurities; a rolling process of the H-shaped steel is as follows: heating casting blank in a heating furnace, performing rolling by a cogging mill, performing rolling by a universal rolling mill and quickly cooling the steel in two-stage manner after rolling; the method adopts the two-stage quick cooling method after the H-shaped steel is hot-rolled, so that the high-temperature H-shaped steel is cooled to proper temperature at short time; by using the cooling method after colling, texture state of the H-shaped steel with fine crystal particles and complex phase texture is obtained, adding amount of the alloy elements is drastically reduced, production cost is notably reduced when requirement of high-strength performance is satisfied, and welding performance of the steel and production efficiency are improved.
Description
Technical field
The present invention relates to the low alloy steel field, be specifically related to a kind of ys 550MPa low alloy hot rolling H shaped steel and roll the postcooling method.
Background technology
Hot rolled H-shaped is a kind of economic section section bar, has excellent mechanical property and superior use properties, and mainly show as: 1) modulus of section is big, when the carrying condition is identical, can practice thrift metal 10-15%, thereby reduces cost; 2) handsome in appearance, easy to process, the outside is parallel in its edge of a wing; The H shaped steel of various different sizes can be combined into the member of many different shapeies and size easily; It is convenient to connect, and is convenient to mechanical workout, can enhance productivity and alleviate the producer's labour intensity; 3) improved structural strength, compared with common joist steel, when sectional area or weight were roughly the same, its resistance to bend, anti-pressure ability were higher.Can be widely used in fields such as construction industry, electric power, water conservancy, the energy, chemical industry, communications and transportation, oil platform, light industry, generally adopt H shaped steel to replace common joist steel abroad.
Along with the industrialized progress in the whole world; Be becoming tight in iron and steel crude fuel day; Under the situation that environmental stress increases day by day, engineering structure particularly super-span, superelevation layer, heavily loaded engineering structure etc. need develop to lightweight, economized, functionalization direction, thereby engineering structure is guaranteeing have under the prerequisite of enough plasticity and toughness with hot rolled H-shaped need; Significantly improve intensity, functional and safe military service performance, therefore require very high metallurgical technology process and device control level.
The H shaped steel manufacturing enterprise of China has developed 420MPa, other H shaped steel of 460MPa grade at present; But all be to adopt the hot-rolling method production of adding alloying element; And the consumption of its alloying element is higher, is that the BS 55C of 420MPa level is hot rolled H-shaped like ys, adopts Nb, V combined microalloying; V content is 0.08～0.12wt%, and Nb content is 0.040～0.060wt%; Come out and 550MPa rank H shaped steel is still untapped, produce as also adopting this method, its alloying element content will be higher, cause steel-making cost very high; And, cause welding property to worsen owing to alloying element content, carbon content etc. are higher; In addition, for obtaining impelling strength preferably, require very low finishing temperature, load and energy consumption that this had both increased milling train have reduced production efficiency again.
Summary of the invention
The objective of the invention is to overcome the deficiency of prior art, a kind of consumption that reduces alloying element significantly is provided, satisfy the ys 500MPa level low alloy rolling of hot-rolled H-shaped steel postcooling method of high-intensity performance requirement; Further aim of the present invention is to provide production technique simpler and easy, energy-conservation, efficient, cheaply ys 500MPa level low alloy rolling of hot-rolled H-shaped steel postcooling method.
To achieve these goals, the technical scheme of the present invention's employing is:
Said ys 500MPa level low alloy rolling of hot-rolled H-shaped steel postcooling method, ys 550MPa level low alloy is hot rolled H-shaped, by mass percentage (wt%); Composition is: C:0.13～0.18, Si:0.30～0.50, Mn:1.40～1.60; P :≤0.025, S :≤0.025, V:0.10～0.12; N:0.010～0.014, Als:0.003～0.030, all the other are iron and remaining trace impurity;
This H section rolling technology is: and strand process furnace heating → bloomer is rolling → and universal mill is rolling → and rolling the back two-part cools off fast; Be specially:
Strand is heated to 1210～1250 ℃ through process furnace; 1100～1150 ℃ of bloomer rolling sequence start rolling temperatures, 990～1030 ℃ of finishing temperatures; 920～960 ℃ of the start rolling temperatures of universal mill, 850～900 ℃ of the finishing temperatures of universal mill; Adopt two-part to cool off fast after rolling immediately, first section quick process for cooling parameter is: temperature was 840～890 ℃ when the H shaped steel edge of a wing and web began to cool down, and temperature was 640～690 ℃ when cooling finished, 75～150 ℃/s of speed of cooling; After first section quick cooling, carry out second section cooling fast immediately, second section quick process for cooling parameter is: temperature was 640～690 ℃ when the H shaped steel edge of a wing and web began to cool down, and temperature is 500～600 ℃ during the cooling end, 20～45 ℃/s of speed of cooling; Strand is carried out two-part when cooling off fast, the spray normal-temperature water refrigerative type of cooling is adopted on the H shaped steel edge of a wing and web, water coolant is sprayed onto on the H shaped steel edge of a wing and the web through nozzle; During actually operating, according to H shaped steel specification, on the H shaped steel edge of a wing and web outside one or more groups nozzle is set, use water pump to control, and then the speed of cooling of control two-part when cooling off fast from the cooling water pressure and the flow of nozzle ejection.
Said ys 550MPa level low alloy rolling of hot-rolled H-shaped steel postcooling method, the technical scheme of employing has the following advantages:
At first, ys 550MPa level low alloy rolling of hot-rolled H-shaped steel postcooling method, through after the hot rolling of H shaped steel, adopting the two-part method for rapid cooling, the H shaped steel that can will have comparatively high temps within a short period of time is cooled to suitable temperature; This method of cooling is utilized refined crystalline strengthening, precipitation strength and phase transformation strengthening mechanism, obtains having the H shaped steel structural state of small grains and heterogeneous structure, has significantly reduced the addition of alloying element, can significantly reduce production costs;
Secondly; The H shaped steel that said ys 550MPa level low alloy rolling of hot-rolled H-shaped steel postcooling method is made; The top layer is thin bainite structure; Heart portion is the heterogeneous structure of polygonal ferrite, perlite, acicular ferrite and little granular bainite, and this H shaped steel satisfies the high-intensity performance requirement in the impelling strength and extension property that significantly do not reduce steel;
Again secondly, the H shaped steel that said ys 550MPa level low alloy rolling of hot-rolled H-shaped steel postcooling method is made because alloying element content is lower, has improved the welding property of steel;
At last, said ys 550MPa level low alloy rolling of hot-rolled H-shaped steel postcooling method, finishing temperature is higher, has both reduced the load and the energy consumption of milling train, has improved production efficiency again.
Embodiment
Through the description to optimum embodiment, specific embodiments of the invention is done further detailed explanation below.
Embodiment 1
Ys 550MPa level low alloy is hot rolled H-shaped rolls the postcooling method, and ys 550MPa level low alloy is hot rolled H-shaped, by mass percentage (wt%); Composition is: C:0.14, Si:0.42, Mn:1.48; P:0.025, S:0.018, V:0.10; N:0.011, Als:0.006, all the other are iron and remaining trace impurity;
This H shaped steel steel rolling technology is: and strand process furnace heating → bloomer is rolling → and universal mill is rolling → and rolling the back two-part cools off fast; Be specially:
Strand is heated to 1245 ℃ through process furnace; 1145 ℃ of bloomer rolling sequence start rolling temperatures, 995 ℃ of finishing temperatures; 925 ℃ of the start rolling temperatures of universal mill, 855 ℃ of finishing temperatures; Adopt the quick water cooling of two-part after rolling immediately, first section quick cooling process parameter is: temperature was 850 ℃ when the H shaped steel edge of a wing and web began to cool down, and temperature was 665 ℃ when cooling finished, 80 ℃/s of speed of cooling; After first section quick water cooling, carry out second section quick water cooling immediately, second section quick cooling process parameter is: temperature was 665 ℃ when the H shaped steel edge of a wing and web began to cool down, and temperature was 545 ℃ when cooling finished, 35 ℃/s of speed of cooling.
(specification is that 588mm * 300mm * 12mm * 20mm) performance perameter is to H shaped steel: R
ELBe 570MPa, R
mBe 665MPa, A is that 22% ,-20 ℃ of impacts of collision absorb energy KV
2Be 155J.
Embodiment 2
Ys 550MPa level low alloy rolling of hot-rolled H-shaped steel postcooling method, ys 550MPa level low alloy is hot rolled H-shaped, by mass percentage (wt%); Composition is: C:0.18, Si:0.35, Mn:1.56; P:0.021, S:0.009, V:0.11; N:0.013, Als:0.017, all the other are iron and remaining trace impurity;
This H shaped steel steel rolling technology is: and strand process furnace heating → bloomer is rolling → and universal mill is rolling → and rolling the back two-part cools off fast; Be specially:
Strand is heated to 1210 ℃ through process furnace; 1105 ℃ of bloomer rolling sequence start rolling temperatures, 1010 ℃ of finishing temperatures; 935 ℃ of the start rolling temperatures of universal mill, 880 ℃ of finishing temperatures; Adopt the quick water cooling of two-part after rolling immediately, first section quick cooling process parameter is: temperature was 870 ℃ when the H shaped steel edge of a wing and web began to cool down, and temperature was 690 ℃ when cooling finished, 100 ℃/s of speed of cooling; After first section quick water cooling, carry out second section quick water cooling immediately, second section quick cooling process parameter is: temperature was 690 ℃ when the H shaped steel edge of a wing and web began to cool down, and temperature was 600 ℃ when cooling finished, 45 ℃/s of speed of cooling.
(specification is that 600mm * 200mm * 11mm * 17mm) performance perameter is to H shaped steel: R
ELBe 590MPa, R
mBe 690MPa, A is that 20% ,-20 ℃ of impacts of collision absorb energy KV
2Be 95J.
Embodiment 3
Ys 550MPa level low alloy rolling of hot-rolled H-shaped steel postcooling method, ys 550MPa level low alloy is hot rolled H-shaped, by mass percentage (wt%); Composition is: C:0.16, Si:0.48, Mn:1.40; P:0.020, S:0.005, V:0.12; N:0.014, Als:0.026, all the other are iron and remaining trace impurity;
This H shaped steel steel rolling technology is: and strand process furnace heating → bloomer is rolling → and universal mill is rolling → and rolling the back two-part cools off fast; Be specially:
Strand is heated to 1235 ℃ through process furnace; 1135 ℃ of bloomer rolling sequence start rolling temperatures, 1025 ℃ of finishing temperatures; 960 ℃ of the start rolling temperatures of universal mill, 900 ℃ of finishing temperatures; Adopt the quick water cooling of two-part after rolling immediately, first section quick cooling process parameter is: temperature was 890 ℃ when the H shaped steel edge of a wing and web began to cool down, and temperature was 650 ℃ when cooling finished, 130 ℃/s of speed of cooling; After first section quick water cooling, carry out second section quick water cooling immediately, second section quick cooling process parameter is: temperature was 650 ℃ when the H shaped steel edge of a wing and web began to cool down, and temperature was 520 ℃ when cooling finished, 25 ℃/s of speed of cooling.
(specification is that 600mm * 200mm * 11mm * 17mm) performance perameter is to H shaped steel: R
ELBe 580MPa, R
mBe 675MPa, A is that 21% ,-20 ℃ of impacts of collision absorb energy KV
2Be 107J.
Embodiment 4
Ys 550MPa level low alloy rolling of hot-rolled H-shaped steel postcooling method, ys 550MPa level low alloy is hot rolled H-shaped, by mass percentage (wt%); Composition is: C:0.13, Si:0.50, Mn:1.60; P:0.018, S:0.016, V:0.11; N:0.010, Als:0.030, all the other are iron and remaining trace impurity;
This H shaped steel steel rolling technology is: and strand process furnace heating → bloomer is rolling → and universal mill is rolling → and rolling the back two-part cools off fast; Be specially:
Strand is heated to 1250 ℃ through process furnace; 1150 ℃ of bloomer rolling sequence start rolling temperatures, 1030 ℃ of finishing temperatures; 940 ℃ of the start rolling temperatures of universal mill, 870 ℃ of finishing temperatures; Adopt the quick water cooling of two-part after rolling immediately, first section quick cooling process parameter is: temperature was 860 ℃ when the H shaped steel edge of a wing and web began to cool down, and temperature was 635 ℃ when cooling finished, 75 ℃/s of speed of cooling; After first section quick water cooling, carry out second section quick water cooling immediately, second section quick cooling process parameter is: temperature was 635 ℃ when the H shaped steel edge of a wing and web began to cool down, and temperature was 595 ℃ when cooling finished, 20 ℃/s of speed of cooling.
(specification is that 600mm * 200mm * 11mm * 17mm) performance perameter is to H shaped steel: R
ELBe 585MPa, R
mBe 625MPa, A is that 21.5% ,-20 ℃ of impacts of collision absorb energy KV
2Be 135J.
Embodiment 5
Ys 550MPa level low alloy rolling of hot-rolled H-shaped steel postcooling method, ys 550MPa level low alloy is hot rolled H-shaped, by mass percentage (wt%); Composition is: C:0.17, Si:0.30, Mn:1.50; P:0.015, S:0.009, V:0.12; N:0.012, Als:0.003, all the other are iron and remaining trace impurity;
This H shaped steel steel rolling technology is: and strand process furnace heating → bloomer is rolling → and universal mill is rolling → and rolling the back two-part cools off fast; Be specially:
Strand is heated to 1230 ℃ through process furnace; 1100 ℃ of bloomer rolling sequence start rolling temperatures, 990 ℃ of finishing temperatures; 920 ℃ of the start rolling temperatures of universal mill, 850 ℃ of finishing temperatures; Adopt the quick water cooling of two-part after rolling immediately, first section quick cooling process parameter is: temperature was 840 ℃ when the H shaped steel edge of a wing and web began to cool down, and temperature was 660 ℃ when cooling finished, 150 ℃/s of speed of cooling; After first section quick water cooling, carry out second section quick water cooling immediately, second section quick cooling process parameter is: temperature was 660 ℃ when the H shaped steel edge of a wing and web began to cool down, and temperature was 500 ℃ when cooling finished, 40 ℃/s of speed of cooling.
(specification is that 600mm * 200mm * 11mm * 17mm) performance perameter is to H shaped steel: R
ELBe 560MPa, R
mBe 600MPa, A is that 23% ,-20 ℃ of impacts of collision absorb energy KV
2Be 157J.
Among the embodiment 1 to embodiment 5; Ys 550MPa level low alloy is hot rolled H-shaped rolls the postcooling method; Roll the back and adopt the quick water cooling of two-part; The H shaped steel edge of a wing and web are adopted the spray normal-temperature water refrigerative type of cooling, and the normal-temperature water type of cooling can extra increase production cost, and water coolant is sprayed onto on the H shaped steel edge of a wing and the web through nozzle; During actually operating,, one or more groups nozzle is set, uses water pump to control from the cooling water pressure and the flow of nozzle ejection in H shaped steel edge of a wing part and web outside according to H shaped steel specification, and then the speed of cooling of control two-part when cooling off fast; Like specification is the H shaped steel of 600mm * 200mm * 11mm * 17mm; When speed of cooling is 75～150 ℃/s; In H shaped steel edge of a wing part and web both sides two groups of nozzles are set respectively, every group of nozzle ejection cooling water pressure is 1.0～1.5MPa, and flow is 500～1000L/min; When speed of cooling is 20～45 ℃/s, in H shaped steel edge of a wing part and web both sides one group of nozzle is set respectively, cooling water pressure is 1.0～1.5MPa, and flow is 300～800L/min.
Principle of the present invention is: (1) utilizes the metallic particles control original austenite grains size of indissoluble; The required critical strain amount of the static recrystallize of high temperature austenite is reduced; Recrystallize carries out more easily; Also make the austenite crystal behind the recrystallize be difficult for growing up, reduced the separate out amount of V (CN) simultaneously in the high temperature austenite district; Through the distortion of austenite low-temperature range, V (CN) is analyzed at low temperature austenite middle part, thereby in deformed austenite, form a large amount of deformed belts and high density dislocation.
(2) carry out first section after H shaped steel rolls immediately and wear the supper-fast cooling of water; Because Quench is after steel finish to gauge, to carry out immediately; The static recrystallize of deformed austenite is suppressed; Thereby in the deformed austenite of non-recrystallization, keep more dislocation and static recovery subgrain boundary etc., make it to become the cenotype forming core place that supercooled austenite changes; Austenite crystal was grown up before Quench also can stop phase transformation; Simultaneously, in the steel surface Quench process, because water coolant is taken away a large amount of heats; Therefore make steel surface and core produce bigger condensate depression, thereby the crystal boundary forming core free energy of ferritic transformation is reduced, promote its forming core; Realize structure refinement, and increased V (CN) and separate out motivating force; Thereby the effect of the refined crystalline strengthening of giving full play to and precipitation strength.
(3) first sections quick coolings finish before the bainitic transformation of steel, immediately carry out second section supper-fast cooling, and through supper-fast cooling, perlite sheet spacing reduces, and plays certain strengthening effect; Simultaneously, suitably reduce rate of cooling this moment, can guarantee to form bainite structure an amount of, refinement; Avoid forming the thick bainite structure of the toughness plasticity that has a strong impact on steel etc.; Played certain phase transformation strengthening effect, its toughness still can meet the demands, and is favourable to the over-all properties of steel.Thereby effectively utilize various strengthening mechanisms among the present invention, adopting under the lower alloy content condition, reach the mechanical property requirements of ys 550MPa level H shaped steel.
The present invention provides a kind of new structural state to ys 550MPa grade high-strength H shaped steel, and promptly the top layer is the thick thin bainite structure of 0.5-1mm, and heart portion is the heterogeneous structure of polygonal ferrite, perlite, acicular ferrite and little granular bainite.And the tissue that the conventional mode of production forms is ferritic and pearlitic structure.
Adopt the foundation of this heterogeneous structure to be: Polygons and acicular ferrite grain-size are little, and the matrix dislocation desity is high, has good strengthening effect; The cemetite lamellae interlamellar spacing is little in the perlite, and degradation phenomena occurs, and the perlite strengthening effect is strengthened, and the little granular bainite has certain effect to the raising of intensity, does not significantly reduce the impelling strength and the extension property of steel simultaneously.
Above the present invention has been carried out exemplary description; Obviously the concrete realization of the present invention does not receive the restriction of aforesaid way; As long as adopted the improvement of the various unsubstantialities that method of the present invention design and technical scheme carry out; Or design of the present invention and technical scheme are directly applied to other occasion without improving, all within protection scope of the present invention.
Claims (5)
1. ys 550MPa level low alloy rolling of hot-rolled H-shaped steel postcooling method, ys 550MPa level low alloy is hot rolled H-shaped, by mass percentage; Composition is: C:0.13～0.18, Si:0.30～0.50, Mn:1.40～1.60; P :≤0.025, S :≤0.025, V:0.10～0.12; N:0.010～0.014, Als:0.003～0.030, all the other are iron and remaining trace impurity;
This H section rolling technology is: and strand process furnace heating → bloomer is rolling → and universal mill is rolling → and rolling the back two-part cools off fast; Be specially:
Strand is heated to 1210～1250 ℃ through process furnace; 1100～1150 ℃ of bloomer rolling sequence start rolling temperatures, 990～1030 ℃ of finishing temperatures; 920～960 ℃ of the start rolling temperatures of universal mill, 850～900 ℃ of the finishing temperatures of universal mill; Adopt two-part to cool off fast after rolling immediately, first section quick process for cooling parameter is: temperature was 840～890 ℃ when the H shaped steel edge of a wing and web began to cool down, and temperature was 640～690 ℃ when cooling finished, 75～150 ℃/s of speed of cooling; After first section quick cooling, carry out second section cooling fast immediately, second section quick process for cooling parameter is: temperature was 640～690 ℃ when the H shaped steel edge of a wing and web began to cool down, and temperature is 500～600 ℃ during the cooling end, 20～45 ℃/s of speed of cooling.
2. according to the described ys 550MPa level low alloy of claim 1 rolling of hot-rolled H-shaped steel postcooling method, it is characterized in that: wherein, strand is heated to 1210～1230 ℃ through process furnace; 1100～1135 ℃ of bloomer rolling sequence start rolling temperatures, 990～1010 ℃ of finishing temperatures; 920～940 ℃ of the start rolling temperatures of universal mill, 850～880 ℃ of finishing temperatures; First section quick process for cooling parameter is: temperature was 850～870 ℃ when the H shaped steel edge of a wing and web began to cool down, and temperature was 660～690 ℃ when cooling finished, and speed of cooling is 75～130 ℃/s; Second section quick process for cooling parameter is: temperature was 660～690 ℃ when the H shaped steel edge of a wing and web began to cool down, and temperature was 500～545 ℃ when cooling finished, and speed of cooling is 25～40 ℃/s.
3. according to the described ys 550MPa level low alloy of claim 2 rolling of hot-rolled H-shaped steel postcooling method, it is characterized in that: wherein, strand is heated to 1235～1245 ℃ through process furnace; 1135～1145 ℃ of bloomer rolling sequence start rolling temperatures, 1010～1025 ℃ of finishing temperatures; 940～960 ℃ of the start rolling temperatures of universal mill, 880～900 ℃ of finishing temperatures; First section quick process for cooling parameter is: temperature was 870～890 ℃ when the H shaped steel edge of a wing and web began to cool down, and temperature was 665～690 ℃ when cooling finished, and speed of cooling is 100～150 ℃/s; Second section quick process for cooling parameter is: temperature was 665～690 ℃ when the H shaped steel edge of a wing and web began to cool down, and temperature was 545～600 ℃ when cooling finished, and speed of cooling is 35～45 ℃/s.
4. according to claim 1 or 2 or 3 described ys 550MPa level low alloy rolling of hot-rolled H-shaped steel postcooling methods; It is characterized in that: the content of Mn and V during ys 550MPa level low alloy is hot rolled H-shaped; Be by mass percentage: Mn:1.40～1.48, V:0.10～0.11.
5. according to claim 1 or 2 or 3 described ys 550MPa level low alloy rolling of hot-rolled H-shaped steel postcooling methods; It is characterized in that: the content of Mn and V during ys 550MPa level low alloy is hot rolled H-shaped; Be by mass percentage: Mn:1.48～1.56, V:0.11～0.12.
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| CN102974609A (en) * | 2012-12-06 | 2013-03-20 | 莱芜钢铁集团有限公司 | H-shaped steel hot rolling production method |
| CN103589951A (en) * | 2013-11-01 | 2014-02-19 | 内蒙古包钢钢联股份有限公司 | Large section H shaped steel and its production method |
| WO2014175122A1 (en) * | 2013-04-26 | 2014-10-30 | 新日鐵住金株式会社 | H-shaped steel and method for producing same |
| CN104525561A (en) * | 2015-01-15 | 2015-04-22 | 唐山钢铁集团有限责任公司 | Method for producing low-carbon hot rolled strip steel with degenerated pseudopearlite structure |
| CN106636948A (en) * | 2016-09-29 | 2017-05-10 | 马钢(集团)控股有限公司 | Anti-seismic structural steel with yield strength being 550MPa grade, and production method thereof |
| CN107794450A (en) * | 2017-11-10 | 2018-03-13 | 山东钢铁股份有限公司 | A kind of yield strength 550MPa grade low-temp high tenacity is hot rolled H-shaped and preparation method thereof |
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| CN111054765A (en) * | 2019-11-21 | 2020-04-24 | 山东德坊新材料科技有限公司 | Cooling method and system for H-shaped steel after rolling |
| CN115161553A (en) * | 2022-06-22 | 2022-10-11 | 马鞍山钢铁股份有限公司 | Hot-rolled H-shaped steel with yield strength of 550MPa and-20 ℃ longitudinal and transverse low-temperature impact toughness and production method thereof |
| CN116334475A (en) * | 2021-12-22 | 2023-06-27 | 中国石油天然气集团有限公司 | Economic 550MPa hot-rolled H-shaped steel for ultra-deep well derrick and production method |
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