CN102676919B - 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 low alloy steel field, be specifically related to a kind of yield strength 550MPa low alloy hot rolling H profile steel roller repairing method.
Background technology
Hot rolled H-shaped is a kind of economic section section bar, and have excellent mechanical property and superior use properties, main manifestations is: 1) modulus of section is large, when the condition of carrying is identical, can save metal 10-15%, thus reduce cost; 2) handsome in appearance, easy to process, external side parallel in its edge of a wing, the H profile steel of various different size can be combined into the component of many different shapeies and size easily, it is convenient to connect, and is convenient to mechanical workout, can enhances productivity and alleviate the labour intensity of the producer; 3) improve structural strength, compare with common joist steel, sectional area or weight roughly the same time, its resistance to bend, anti-pressure ability are higher.The fields such as construction industry, electric power, water conservancy, the energy, chemical industry, communications and transportation, oil platform, light industry can be widely used in, generally adopt H profile steel to replace common joist steel abroad.
Along with the progress of global industry, be becoming tight in iron and steel crude fuel day, when environmental stress increases increasingly, engineering structure particularly super-span, Super High, heavily loaded engineering structure etc. needs to lightweight, economized, functionalization future development, thus engineering structure with hot rolled H-shaped need under the prerequisite ensuring enough plasticity and toughness, significantly improve intensity, functional and safe performance of being on active service, therefore to metallurgical technology process and device control level requirement very high.
The H profile steel manufacturing enterprise of current China has developed other H profile steel of 420MPa, 460MPa grade, but be all adopt the hot-rolling method adding alloying element to produce, and the consumption of its alloying element is higher, if yield strength is that the BS 55C of 420MPa level is hot rolled H-shaped, adopt Nb, V combined microalloying, V content is 0.08 ~ 0.12wt%, Nb content is 0.040 ~ 0.060wt%; And 550MPa rank H profile steel not yet develops, as also adopted the method to produce, its alloying element content will be higher, cause steel-making cost very high; And due to alloying element content, carbon content etc. higher, cause welding property to worsen; In addition, for obtaining good impelling strength, require very low finishing temperature, this had both increased load and the energy consumption of milling train, again reduced production efficiency.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, a kind of consumption significantly reducing alloying element is provided, meet method of cooling after the yield strength 500MPa level low alloy rolling of hot-rolled H-shaped steel of high-intensity performance requirement; It is simpler and easy, energy-conservation, efficient that further aim of the present invention is to provide production technique, method of cooling after the yield strength 500MPa level low alloy rolling of hot-rolled H-shaped steel of low cost.
To achieve these goals, the technical solution used in the present invention is:
Method of cooling after described yield strength 500MPa level low alloy rolling of hot-rolled H-shaped steel, yield strength 550MPa level low alloy is hot rolled H-shaped, by mass percentage (wt%), and 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 profile steel rolling technology is: strand process furnace heating → bloomer rolling → Rolling With Universal Mill → roll rear two-part to cool fast; Be specially:
Strand is heated to 1210 ~ 1250 DEG C through process furnace; Bloomer rolling sequence start rolling temperature 1100 ~ 1150 DEG C, finishing temperature 990 ~ 1030 DEG C; The start rolling temperature of universal mill 920 ~ 960 DEG C, the finishing temperature of universal mill 850 ~ 900 DEG C; Adopt two-part to cool fast after rolling immediately, the quick process for cooling parameter of first paragraph is: temperature 840 ~ 890 DEG C when the H profile steel edge of a wing and web begin to cool down, and at the end of cooling, temperature is 640 ~ 690 DEG C, speed of cooling 75 ~ 150 DEG C/s; After first paragraph cools fast, carry out second segment immediately and cool fast, the quick process for cooling parameter of second segment is: when the H profile steel edge of a wing and web begin to cool down, temperature is 640 ~ 690 DEG C, and at the end of cooling, temperature is 500 ~ 600 DEG C, speed of cooling 20 ~ 45 DEG C/s; To strand carry out two-part cool fast time, adopt the water-cooled type of cooling of spray normal temperature to the H profile steel edge of a wing and web, water coolant is sprayed onto on the H profile steel edge of a wing and web by nozzle; During actually operating, according to H profile steel specification, one or more groups nozzle is set on the H profile steel edge of a wing and web outside, the cooling water pressure using water pump to control to spray from nozzle and flow, and then controls speed of cooling when two-part cools fast.
Method of cooling after described yield strength 550MPa level low alloy rolling of hot-rolled H-shaped steel, the technical scheme of employing, has the following advantages:
First, method of cooling after yield strength 550MPa level low alloy rolling of hot-rolled H-shaped steel, by adopting two-part method for rapid cooling after H profile steel hot rolling, can be cooled to suitable temperature by the H profile steel with comparatively high temps within a short period of time; This method of cooling utilizes refined crystalline strengthening, precipitation strength and phase transformation strengthening mechanism, obtains the H profile steel structural state with small grains and heterogeneous structure, significantly decreases the addition of alloying element, significantly can reduce production cost;
Secondly, the H profile steel that after described yield strength 550MPa level low alloy rolling of hot-rolled H-shaped steel, method of cooling manufactures, top layer is thin bainite structure, heart portion is the heterogeneous structure of polygonal ferrite, perlite, acicular ferrite and a small amount of granular bainite, this H profile steel, while the impelling strength significantly not reducing steel and extension property, meets high-intensity performance requirement;
Thirdly, the H profile steel that after described yield strength 550MPa level low alloy rolling of hot-rolled H-shaped steel, method of cooling manufactures, because alloying element content is lower, improves the welding property of steel;
Finally, method of cooling after described yield strength 550MPa level low alloy rolling of hot-rolled H-shaped steel, finishing temperature is higher, has both reduced load and the energy consumption of milling train, has turn improved production efficiency.
Embodiment
Below by the description to optimum embodiment, the specific embodiment of the present invention is described in further detail.
Embodiment 1
The roller repairing method that yield strength 550MPa level low alloy is hot rolled H-shaped, yield strength 550MPa level low alloy is hot rolled H-shaped, by mass percentage (wt%), and 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 profile steel steel rolling technique is: strand process furnace heating → bloomer rolling → Rolling With Universal Mill → roll rear two-part to cool fast; Be specially:
Strand is heated to 1245 DEG C through process furnace; Bloomer rolling sequence start rolling temperature 1145 DEG C, finishing temperature 995 DEG C; The start rolling temperature of universal mill 925 DEG C, finishing temperature 855 DEG C; Adopt two-part rapid water to cool after rolling immediately, first paragraph rapid water process for cooling parameter is: when the H profile steel edge of a wing and web begin to cool down, temperature is 850 DEG C, and at the end of cooling, temperature is 665 DEG C, speed of cooling 80 DEG C/s; After the cooling of first paragraph rapid water, carry out the cooling of second segment rapid water immediately, second segment rapid water process for cooling parameter is: when the H profile steel edge of a wing and web begin to cool down, temperature is 665 DEG C, and at the end of cooling, temperature is 545 DEG C, speed of cooling 35 DEG C/s.
H profile steel (specification is 588mm × 300mm × 12mm × 20mm) performance perameter is: R
eLfor 570MPa, R
mfor 665MPa, A are 22% ,-20 DEG C of impacts of collision absorb energy KV
2for 155J.
Embodiment 2
Method of cooling after yield strength 550MPa level low alloy rolling of hot-rolled H-shaped steel, yield strength 550MPa level low alloy is hot rolled H-shaped, by mass percentage (wt%), and 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 profile steel steel rolling technique is: strand process furnace heating → bloomer rolling → Rolling With Universal Mill → roll rear two-part to cool fast; Be specially:
Strand is heated to 1210 DEG C through process furnace; Bloomer rolling sequence start rolling temperature 1105 DEG C, finishing temperature 1010 DEG C; The start rolling temperature of universal mill 935 DEG C, finishing temperature 880 DEG C; Adopt two-part rapid water to cool after rolling immediately, first paragraph rapid water process for cooling parameter is: when the H profile steel edge of a wing and web begin to cool down, temperature is 870 DEG C, and at the end of cooling, temperature is 690 DEG C, speed of cooling 100 DEG C/s; After the cooling of first paragraph rapid water, carry out the cooling of second segment rapid water immediately, second segment rapid water process for cooling parameter is: when the H profile steel edge of a wing and web begin to cool down, temperature is 690 DEG C, and at the end of cooling, temperature is 600 DEG C, speed of cooling 45 DEG C/s.
H profile steel (specification is 600mm × 200mm × 11mm × 17mm) performance perameter is: R
eLfor 590MPa, R
mfor 690MPa, A are 20% ,-20 DEG C of impacts of collision absorb energy KV
2for 95J.
Embodiment 3
Method of cooling after yield strength 550MPa level low alloy rolling of hot-rolled H-shaped steel, yield strength 550MPa level low alloy is hot rolled H-shaped, by mass percentage (wt%), and 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 profile steel steel rolling technique is: strand process furnace heating → bloomer rolling → Rolling With Universal Mill → roll rear two-part to cool fast; Be specially:
Strand is heated to 1235 DEG C through process furnace; Bloomer rolling sequence start rolling temperature 1135 DEG C, finishing temperature 1025 DEG C; The start rolling temperature of universal mill 960 DEG C, finishing temperature 900 DEG C; Adopt two-part rapid water to cool after rolling immediately, first paragraph rapid water process for cooling parameter is: when the H profile steel edge of a wing and web begin to cool down, temperature is 890 DEG C, and at the end of cooling, temperature is 650 DEG C, speed of cooling 130 DEG C/s; After the cooling of first paragraph rapid water, carry out the cooling of second segment rapid water immediately, second segment rapid water process for cooling parameter is: when the H profile steel edge of a wing and web begin to cool down, temperature is 650 DEG C, and at the end of cooling, temperature is 520 DEG C, speed of cooling 25 DEG C/s.
H profile steel (specification is 600mm × 200mm × 11mm × 17mm) performance perameter is: R
eLfor 580MPa, R
mfor 675MPa, A are 21% ,-20 DEG C of impacts of collision absorb energy KV
2for 107J.
Embodiment 4
Method of cooling after yield strength 550MPa level low alloy rolling of hot-rolled H-shaped steel, yield strength 550MPa level low alloy is hot rolled H-shaped, by mass percentage (wt%), and 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 profile steel steel rolling technique is: strand process furnace heating → bloomer rolling → Rolling With Universal Mill → roll rear two-part to cool fast; Be specially:
Strand is heated to 1250 DEG C through process furnace; Bloomer rolling sequence start rolling temperature 1150 DEG C, finishing temperature 1030 DEG C; The start rolling temperature of universal mill 940 DEG C, finishing temperature 870 DEG C; Adopt two-part rapid water to cool after rolling immediately, first paragraph rapid water process for cooling parameter is: when the H profile steel edge of a wing and web begin to cool down, temperature is 860 DEG C, and at the end of cooling, temperature is 635 DEG C, speed of cooling 75 DEG C/s; After the cooling of first paragraph rapid water, carry out the cooling of second segment rapid water immediately, second segment rapid water process for cooling parameter is: when the H profile steel edge of a wing and web begin to cool down, temperature is 635 DEG C, and at the end of cooling, temperature is 595 DEG C, speed of cooling 20 DEG C/s.
H profile steel (specification is 600mm × 200mm × 11mm × 17mm) performance perameter is: R
eLfor 585MPa, R
mfor 625MPa, A are 21.5% ,-20 DEG C of impacts of collision absorb energy KV
2for 135J.
Embodiment 5
Method of cooling after yield strength 550MPa level low alloy rolling of hot-rolled H-shaped steel, yield strength 550MPa level low alloy is hot rolled H-shaped, by mass percentage (wt%), and 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 profile steel steel rolling technique is: strand process furnace heating → bloomer rolling → Rolling With Universal Mill → roll rear two-part to cool fast; Be specially:
Strand is heated to 1230 DEG C through process furnace; Bloomer rolling sequence start rolling temperature 1100 DEG C, finishing temperature 990 DEG C; The start rolling temperature of universal mill 920 DEG C, finishing temperature 850 DEG C; Adopt two-part rapid water to cool after rolling immediately, first paragraph rapid water process for cooling parameter is: when the H profile steel edge of a wing and web begin to cool down, temperature is 840 DEG C, and at the end of cooling, temperature is 660 DEG C, speed of cooling 150 DEG C/s; After the cooling of first paragraph rapid water, carry out the cooling of second segment rapid water immediately, second segment rapid water process for cooling parameter is: when the H profile steel edge of a wing and web begin to cool down, temperature is 660 DEG C, and at the end of cooling, temperature is 500 DEG C, speed of cooling 40 DEG C/s.
H profile steel (specification is 600mm × 200mm × 11mm × 17mm) performance perameter is: R
eLfor 560MPa, R
mfor 600MPa, A are 23% ,-20 DEG C of impacts of collision absorb energy KV
2for 157J.
Embodiment 1 is in embodiment 5, the roller repairing method that yield strength 550MPa level low alloy is hot rolled H-shaped, roll the cooling of rear employing two-part rapid water, the water-cooled type of cooling of spray normal temperature is adopted to the H profile steel edge of a wing and web, the normal-temperature water type of cooling additionally can not increase production cost, and water coolant is sprayed onto on the H profile steel edge of a wing and web by nozzle; During actually operating, according to H profile steel specification, one or more groups nozzle is set at H profile steel flange portions and web outside, the cooling water pressure using water pump to control to spray from nozzle and flow, and then controls speed of cooling when two-part cools fast; As the H profile steel that specification is 600mm × 200mm × 11mm × 17mm, when speed of cooling is 75 ~ 150 DEG C/s, respectively arrange two groups of nozzles at H profile steel flange portions and web both sides, often organizing nozzle ejection cooling water pressure is 1.0 ~ 1.5MPa, and flow is 500 ~ 1000L/min; When speed of cooling is 20 ~ 45 DEG C/s, respectively arrange one group of nozzle at H profile steel flange portions and web both sides, 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 of indissoluble to control original austenite grains size, critical strain amount needed for high temperature austenite Static Recrystallization is reduced, recrystallize more easily carries out, also make the austenite crystal after recrystallize not easily grow up, reduce V(CN simultaneously) amount of precipitation in high temperature austenitic tagma; By the distortion of austenite low-temperature range, make V(CN) analyze in the middle part of low temperature austenite, thus in deformed austenite, form a large amount of deformed belt and high density dislocation.
(2) H profile steel is carried out first paragraph immediately and is worn water ultra-rapid cooling after rolling, because Quench is carried out immediately after steel finish to gauge, therefore deformed austenite Static Recrystallization is made to be suppressed, thus more dislocation and static recovery subgrain boundary etc. is retained in the deformed austenite of non-recrystallization, make it the cenotype nucleation sites becoming Cooling Austenite Transformation; Quench also can stop Austenite Grain Growth before phase transformation; Meanwhile, in steel surface chilling process, because water coolant takes away amount of heat, therefore make steel surface and core produce larger condensate depression, thus the crystal boundary forming core free energy of ferritic transformation is reduced, promote its forming core, realize structure refinement, and add V(CN) separate out motivating force; Thus give full play to the effect of refined crystalline strengthening and precipitation strength.
(3) first paragraph cools fast and terminates before the bainitic transformation of steel, immediately carries out second segment ultra-rapid cooling, and by ultra-rapid cooling, pearlite interlamellar spacing reduces, and plays certain strengthening effect; Meanwhile, now suitably reduce rate of cooling, can ensure to form bainite structure that is appropriate, refinement, avoid the formation of the thick bainite structure etc. of the toughness plasticity having a strong impact on steel, serve certain phase transformation strengthening effect, its toughness still can meet the demands, and is favourable to the over-all properties of steel.Thus in the present invention, effectively utilize various strengthening mechanism, adopting under lower alloy content condition, reach the mechanical property requirements of yield strength 550MPa level H profile steel.
The present invention provides a kind of new structural state to yield strength 550MPa grade high-strength H profile steel, and namely top layer is the thin bainite structure that 0.5-1mm is thick, and heart portion is the heterogeneous structure of polygonal ferrite, perlite, acicular ferrite and a small amount of granular bainite.And the tissue that the conventional mode of production is formed is ferrite and pearlite tissue.
Adopt this heterogeneous structure according to being: Polygons and acicular ferrite grain-size little, matrix dislocation desity is high, has good strengthening effect; In perlite, cemetite lamellae interlamellar spacing is little, and occurs degradation phenomena, and perlite strengthening effect is strengthened, and the raising of a small amount of granular bainite to intensity has certain effect, does not significantly reduce impelling strength and the extension property of steel simultaneously.
Above to invention has been exemplary description; obvious specific implementation of the present invention is not subject to the restrictions described above; as long as have employed the improvement of the various unsubstantialities that method of the present invention is conceived and technical scheme is carried out; or design of the present invention and technical scheme directly applied to other occasion, all within protection scope of the present invention without to improve.
Claims (4)
1. a yield strength 550MPa low alloy hot rolling H profile steel rolling method, yield strength 550MPa level low alloy is hot rolled H-shaped, and by mass percentage, composition is: C:0.14 ~ 0.18, Si:0.42 ~ 0.50, Mn:1.40 ~ 1.48, P :≤0.025, S :≤0.025, V:0.10 ~ 0.11, N:0.010 ~ 0.014, Als:0.017 ~ 0.030, all the other are iron and remaining trace impurity;
This H profile steel rolling technology is: strand process furnace heating → bloomer rolling → Rolling With Universal Mill → roll rear two-part to cool fast; Be specially:
Strand is heated to 1210 ~ 1250 DEG C through process furnace; Bloomer rolling sequence start rolling temperature 1100 ~ 1150 DEG C, finishing temperature 990 ~ 1030 DEG C; The start rolling temperature of universal mill 920 ~ 960 DEG C, the finishing temperature of universal mill 850 ~ 900 DEG C; Adopt two-part to cool fast after rolling immediately, the quick process for cooling parameter of first paragraph is: temperature 840 ~ 890 DEG C when the H profile steel edge of a wing and web begin to cool down, and at the end of cooling, temperature is 640 ~ 690 DEG C, speed of cooling 75 ~ 150 DEG C/s; After first paragraph cools fast, carry out second segment immediately and cool fast, the quick process for cooling parameter of second segment is: when the H profile steel edge of a wing and web begin to cool down, temperature is 640 ~ 690 DEG C, and at the end of cooling, temperature is 500 ~ 600 DEG C, speed of cooling 20 ~ 45 DEG C/s.
2., according to yield strength 550MPa low alloy hot rolling H profile steel rolling method according to claim 1, it is characterized in that: wherein, strand is heated to 1210 ~ 1230 DEG C through process furnace; Bloomer rolling sequence start rolling temperature 1100 ~ 1135 DEG C, finishing temperature 990 ~ 1010 DEG C; The start rolling temperature of universal mill 920 ~ 940 DEG C, finishing temperature 850 ~ 880 DEG C; The quick process for cooling parameter of first paragraph is: when the H profile steel edge of a wing and web begin to cool down, temperature is 850 ~ 870 DEG C, and at the end of cooling, temperature is 660 ~ 690 DEG C, and speed of cooling is 75 ~ 130 DEG C/s; The quick process for cooling parameter of second segment is: when the H profile steel edge of a wing and web begin to cool down, temperature is 660 ~ 690 DEG C, and at the end of cooling, temperature is 500 ~ 545 DEG C, and speed of cooling is 25 ~ 40 DEG C/s.
3., according to yield strength 550MPa low alloy hot rolling H profile steel rolling method according to claim 1, it is characterized in that: wherein, strand is heated to 1235 ~ 1245 DEG C through process furnace; Bloomer rolling sequence start rolling temperature 1135 ~ 1145 DEG C, finishing temperature 1010 ~ 1025 DEG C; The start rolling temperature of universal mill 940 ~ 960 DEG C, finishing temperature 880 ~ 900 DEG C; The quick process for cooling parameter of first paragraph is: when the H profile steel edge of a wing and web begin to cool down, temperature is 870 ~ 890 DEG C, and at the end of cooling, temperature is 665 ~ 690 DEG C, and speed of cooling is 100 ~ 150 DEG C/s; The quick process for cooling parameter of second segment is: when the H profile steel edge of a wing and web begin to cool down, temperature is 665 ~ 690 DEG C, and at the end of cooling, temperature is 545 ~ 600 DEG C, and speed of cooling is 35 ~ 45 DEG C/s.
4. according to the yield strength 550MPa low alloy hot rolling H profile steel rolling method described in claim 1 or 2 or 3, it is characterized in that: the content of V in yield strength 550MPa low alloy hot rolling H profile steel, is V:0.11 ~ 0.12 by mass percentage.
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| JPWO2014175122A1 (en) * | 2013-04-26 | 2017-02-23 | 新日鐵住金株式会社 | H-section steel and its manufacturing method |
| CN103589951B (en) * | 2013-11-01 | 2016-06-01 | 内蒙古包钢钢联股份有限公司 | The production method of big cross section H profile steel |
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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 |
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