CN102127710B - Chromium-free weather-resistant steel - Google Patents
Chromium-free weather-resistant steel Download PDFInfo
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- CN102127710B CN102127710B CN 201110086804 CN201110086804A CN102127710B CN 102127710 B CN102127710 B CN 102127710B CN 201110086804 CN201110086804 CN 201110086804 CN 201110086804 A CN201110086804 A CN 201110086804A CN 102127710 B CN102127710 B CN 102127710B
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 104
- 239000010959 steel Substances 0.000 title claims abstract description 104
- 238000000034 method Methods 0.000 claims abstract description 17
- 239000000126 substance Substances 0.000 claims abstract description 10
- 239000012535 impurity Substances 0.000 claims abstract description 9
- 238000010438 heat treatment Methods 0.000 claims abstract description 5
- 238000005096 rolling process Methods 0.000 claims description 35
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 32
- 238000001816 cooling Methods 0.000 claims description 23
- 238000007670 refining Methods 0.000 claims description 21
- 239000000203 mixture Substances 0.000 claims description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 16
- 238000009749 continuous casting Methods 0.000 claims description 15
- 229910052742 iron Inorganic materials 0.000 claims description 15
- 238000006477 desulfuration reaction Methods 0.000 claims description 8
- 230000023556 desulfurization Effects 0.000 claims description 8
- 238000009628 steelmaking Methods 0.000 claims description 7
- 241001417490 Sillaginidae Species 0.000 claims description 6
- 239000002893 slag Substances 0.000 claims description 6
- 238000010583 slow cooling Methods 0.000 claims description 6
- 238000005520 cutting process Methods 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 4
- 238000012545 processing Methods 0.000 claims description 3
- 229910008455 Si—Ca Inorganic materials 0.000 claims description 2
- 230000002308 calcification Effects 0.000 claims description 2
- 230000007935 neutral effect Effects 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 17
- 229910052802 copper Inorganic materials 0.000 abstract description 10
- 238000005275 alloying Methods 0.000 abstract description 8
- 229910052799 carbon Inorganic materials 0.000 abstract description 8
- 229910052759 nickel Inorganic materials 0.000 abstract description 7
- 229910052748 manganese Inorganic materials 0.000 abstract description 6
- 229910052698 phosphorus Inorganic materials 0.000 abstract description 6
- 229910052710 silicon Inorganic materials 0.000 abstract description 5
- 229910052758 niobium Inorganic materials 0.000 abstract description 4
- 229910052796 boron Inorganic materials 0.000 abstract description 3
- 229910000746 Structural steel Inorganic materials 0.000 abstract 1
- 229910000870 Weathering steel Inorganic materials 0.000 description 23
- 230000007797 corrosion Effects 0.000 description 17
- 238000005260 corrosion Methods 0.000 description 17
- 239000010949 copper Substances 0.000 description 12
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 10
- 229910045601 alloy Inorganic materials 0.000 description 6
- 239000000956 alloy Substances 0.000 description 6
- 239000011651 chromium Substances 0.000 description 6
- 238000013461 design Methods 0.000 description 6
- 238000002360 preparation method Methods 0.000 description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 4
- 238000005266 casting Methods 0.000 description 4
- 229910052804 chromium Inorganic materials 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 3
- 229910000851 Alloy steel Inorganic materials 0.000 description 2
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 2
- 241001062472 Stokellia anisodon Species 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- 239000000470 constituent Substances 0.000 description 2
- 235000019628 coolness Nutrition 0.000 description 2
- ZOMNIUBKTOKEHS-UHFFFAOYSA-L dimercury dichloride Chemical group Cl[Hg][Hg]Cl ZOMNIUBKTOKEHS-UHFFFAOYSA-L 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000003801 milling Methods 0.000 description 2
- 229910052750 molybdenum Inorganic materials 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 239000011574 phosphorus Substances 0.000 description 2
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 238000009736 wetting Methods 0.000 description 2
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910001563 bainite Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 229910001567 cementite Inorganic materials 0.000 description 1
- 230000002860 competitive effect Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
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- 238000011161 development Methods 0.000 description 1
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- 238000006056 electrooxidation reaction Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 150000002366 halogen compounds Chemical class 0.000 description 1
- 238000005098 hot rolling Methods 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- KSOKAHYVTMZFBJ-UHFFFAOYSA-N iron;methane Chemical compound C.[Fe].[Fe].[Fe] KSOKAHYVTMZFBJ-UHFFFAOYSA-N 0.000 description 1
- 239000011572 manganese Substances 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- 239000010955 niobium Substances 0.000 description 1
- -1 nitrogenous compound Chemical class 0.000 description 1
- 229910000510 noble metal Inorganic materials 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
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- 231100000719 pollutant Toxicity 0.000 description 1
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- 230000001988 toxicity Effects 0.000 description 1
- 231100000419 toxicity Toxicity 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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Abstract
The invention belongs to the field of metallurgical manufacturing, and relates to components and a manufacturing method of low-cost weather-resistant steel. The steel comprises the following chemical components in percentage by mass: 0.06 to 0.16 percent of C, 0.10 to 0.55 percent of Si, 0.80 to 1.70 percent of Mn, 0.020 to 0.065 percent of P, less than or equal to 0.015 percent of S, 0.15 to 0.25 percent of Cu, less than or equal to 0.30 percent of Ni, less than or equal to 0.075 percent of Nb, 0.002 to 0.005 percent of B and the balance of Fe and inevitable impurities. The main elements of the steel are alloying elements such as C, Si, Mn, P, S, Cu, Ni, Nb, B and the like, and the balance is Fe; the steel is smelted, rolled and cooled to form a finished product, the subsequent heat treatment process is not needed, and the steel has high weather resistance and mechanical property; and the product is non-hardened and tempered steel, and is mainly used as the structural steel of buildings, bridges and the like.
Description
Technical field
The invention belongs to the metallurgical engineering field, relate to steel grade and the manufacture method thereof of a kind of atmosphere of anti-seashore the or industrial atmosphere.Product is mainly H shaped steel or strip product.
Background technology
Along with the steady-state growth of output of steel and going deep into of global application technical research, country more and more payes attention to creating energy conservation type society, along with developing rapidly of industry, topsoil is day by day serious, people more and more pay close attention to the caused steel corrosion problems of principal pollutant such as sulfocompound, nitrogenous compound and halogen compounds, the particularly coastland heavy corrosion that salt particle etc. causes building steel structure that disperses.Solidity to corrosion to steel has proposed Secretary, and wishes that cost can not have large variation.The steel research of the new first phase of country has also proposed low cost, high-performance, long-life requirement to structure iron, some scholars have proposed the concept of economical and weather resistant steel according to the result of study of " when phosphorus content reaches 0.035%; when copper content reaches 0.07%, can improve significantly the weathering resistance of ordinary low-carbon steel ".From the development trend of weathering steel, the interpolation of alloying element is tending towards traceization more, and the weathering steel performance is become better and better.
CN200810026086.X discloses a kind of 600MPa grade high-strength weathering steel and preparation method thereof, this 600MPa grade high-strength weathering steel adopts electric furnace-bar strip continuous casting and rolling flow path preparation, prepare that the main chemical compositions of molten steel is after this high-strength weathering steel refining: C:0.045～0.07wt%, Si:0.10～0.29wt%, Mn:0.8～1.5wt%, P:0.005～0.030wt%, S:0.002～0.008wt%, Cu:0.20～0.5wt%, Cr:0.3～0.7wt%, Ni:0.15～0.35wt%, Ti:0.06～0.079wt%, Nb:0.035～0.050wt%, Alt:0.025～0.050wt%.Described 600MPa grade high-strength weathering steel has that cost is low, competitive power is strong, cold shaping performance and the advantage such as welding property is good, is applicable to make rail vehicle, freight container, bridge, heavy-load automobile, pylon etc.But this type of weathering steel need to add multiple alloy, and production cost is higher, is difficult for being widely used.
The CN200510045624.6 invention relates to the low-alloy structural carbon steel in low alloy steel field, particularly economical atmospheric corrosion resistance, is mainly used in railway, vehicle, bridge, pylon etc. and is exposed to for a long time the steel construction that uses in atmosphere.The alloying constituent of this weathering steel and weight percent content are: C:0.12～0.21, Si:0.2～2.0, Mn:0.7～2.0, S≤0.036, P≤0.034, Cu:0.10～0.40, Al＜0.2, all the other are Fe and trace impurity.By alloyings such as Cu, Mn, Si, Al, and simply adjust the Partial Elements content of ordinary low-carbon steel (Q235 steel), need not change under Q235 steel manufacturing condition, just can produce and have good atmospheric corrosion resistance, the economical and weather resistant steel of comprehensive mechanical performance.But in this type of weathering steel, the too high interpolation of copper, aluminium element causes many constantly to steel-making and steel rolling production process, and the difficulties in industrialization process is more, and is not easy to solve.
CN200810046963.X is for the shortcoming of C too high levels, the invention provides a kind of yield strength greater than 450MPa grade ultra-low-carbon hot rolling weather-resisting steel, the alloying constituent of this weathering steel and weight percent content are: C 0.01～0.05%, Si 0.10～0.40%, Mn 1.50～1.90%, P≤0.02%, S≤0.010%, Cu 0.15～0.55%, Cr 0.20～0.80%, Ni 0.10～0.50%, Mo 0.05～0.50, Nb 0.01～0.05, Ca 0.0010～0.0020, and surplus is Fe and inevitable impurity.The intensity rank of this invention steel grade is higher than traditional weathering steel, and owing to adopting the Ultra-low carbon design, its impelling strength, weldability and atmospheric corrosion resistance are good.But during this type of weathering steel design, interpolation and the Ultra-low carbon of multiple alloying element require to have increased the steel making working procedure cost.
Chinese patent application 200610125365.2 discloses a kind of high-strength weathering steel and production method thereof, belongs to low alloy steel and makes the field.It adopts two or more the compound interpolation in adding of utmost point low-carbon (LC), CU-CR-NI-MO-NB and TI-AL-ZR on Composition Design, carbon content control is being approached or the maxima solubility 0.0218% in A-FE less than carbon under normal temperature, with separating out of minimizing or inhibition cementite, guarantee that master control is organized as uniform bainite structure, to obtain good weather resistance.
To sum up, present weathering steel mainly designs by adding the alloying elements such as corrosion resistant copper, phosphorus, chromium, nickel, molybdenum, for improving corrosion resisting property and reducing because of copper in steel surface generation be full of cracks defective, must add valuable chromium, nickel element, and the chromium element produces huge toxicity to human body under+6 valency states, also is unfavorable for the application of weathering steel when increasing production cost.
Summary of the invention
Deficiency in designing and developing for existing weathering steel steel grade, one of purpose of the present invention is to provide a kind of weathering steel steel grade design of low-cost high-strength.Steel grade design of the present invention is under the prerequisite of not adding noble metal Cr element, control by rational elemental composition, the synergy of utilizing alloy to add element guarantees the weather resistance of steel, for making weathering steel guarantee weathering resistance, high strength, and have under the prerequisite of excellent in toughness, cost of alloy is controlled at lower level, and is suitable for suitability for industrialized production, and control simple in the production process of steel-making and steel rolling process.Roll rear steel and there is no the be full of cracks generation.The weathering steel product of steel grade of the present invention can be applied under anti-industrial atmosphere and seashore atmospheric environment the service requirements to the steel weather resistance.
Another object of the present invention is to provide the preparation method of described chromium-free weather-resistant steel product.
The invention provides a kind of low-cost weathering steel, it is characterized in that the chemical composition of steel by quality % is:
C 0.06～0.16，Si 0.10～0.55，Mn 0.80～1.70，P 0.020～0.065，S≤0.015，Cu 0.15～0.25，Ni≤0.30，Nb≤0.075，B 0.002～0.005。All the other are iron and inevitable impurity.
Preferably, this steel grade is after rolling becoming a useful person, and its performance reaches the requirement shown in following table:
The invention of this steel grade is exactly under the prerequisite that does not contain the Cr element, by the reasonable control of alloying element, makes steel have the corrosive nature of good mechanical property, anti-industrial atmosphere or seashore atmosphere.Product made from steel is delivered goods with hot-rolled state, and its product form can be the strip product of H shaped steel or 4～40mm.
The present invention also provides the preparation method of described chromium-free weather-resistant steel H shaped steel, comprise blast-melted converter steelmaking, LF (or RH) refining, shaped blank (or rectangular bloom) continuous casting, BD breaking down, finish rolling, cold bed air cooling, aligning, the cutting H shaped steel of becoming a useful person, specifically comprise the following steps:
1) being transported to converter after molten iron pre-desulfurization smelts; Adopt LF (or RH) refining, make the chemical composition of steel by quality % be:
C 0.06～0.16, and Si 0.10～0.55, and Mn 0.80～1.70, and P 0.020～0.065, S≤0.015, and Cu 0.15～0.25, Ni≤0.30, Nb≤0.075, B 0.002～0.005; All the other are iron and inevitable impurity;
2) refining enters Hot Metal in Beam Blank (or rectangular bloom) continuous casting working procedure after complete, produces near net shape continuous casting blank (or rectangular bloom blank);
3) blank adopts cold charge or hot-loading and hot-conveying mode to enter process furnace, is heated to 1180～1280 ℃ and comes out of the stove, and carries out high-pressure water descaling;
4) blank that has removed squama delivers to the BD roughing mill by roller-way and the TM finishing train is rolling, and after roughing, temperature is not less than 1090 ℃, the control of finishing temperature to position, the edge of a wing at 830-870 ℃; The rolled products size is carried out according to GB GB/T11263-2005;
5) force cooling to two side wing edges on rollgang after rolling becoming a useful person;
6) on rolled piece, cold bed carries out air cooling;
7) after rolled piece is chilled to below 100 ℃, advances straightener and align.
8) rolled piece cutting is become a useful person H shaped steel, collection.
Preferably, step 2) described near net shape continuous casting blank is H type near net shape continuous casting blank.
Preferably, step 5) cooling the referring to of described pressure taked certain measure, makes steel cooling method fast.
Force the type of cooling to have multiple: as (1) forced air-cooling, to adopt induced draught, strengthen the convection current of air to accelerate cooling rolled piece; (2) be cooled with circulating water; (3) water spray is cooling, and water spray is cooling on steel.Pressure of the present invention is cooling can be the forced cooling method of any one prior art.
Preferably, being heated to 1180～1240 ℃ step 3) comes out of the stove.
Preferably, step 4), finishing temperature edge of a wing position control is good at 830-850 ℃.
Preferably, step 4) in finishing temperature edge of a wing position control is at 830-850 ℃, step 5) in the H shaped steel after rolling is carried out slow cooling.
The present invention also provides the preparation method of described chromium-free weather-resistant steel Strip, comprise blast-melted converter steelmaking, LF (or RH) refining, slab, rolling, cooling, be curled into sheet material, specifically comprise the following steps:
1) being transported to converter after molten iron pre-desulfurization smelts; Adopt LF (or RH) refining, make the chemical composition of steel by quality % be:
C 0.06～0.16, and Si 0.10～0.55, and Mn 0.80～1.70, and P 0.020～0.065, S≤0.015, and Cu 0.15～0.25, Ni≤0.30, Nb≤0.075, B 0.002～0.005; All the other are iron and inevitable impurity;
2) before the molten steel departures, feeding 500m～700m Si-Ca line carries out calcification processing.The liquidus temperature of molten steel is 1500～1550 ℃, refining time 20～60 minutes, and 6～20 minutes soft blow time, soft blow requires molten steel fine motion in bag, and molten steel must not be exposed;
3) continuous casting, the whole process protection cast, covering slag adopts the container plate covering slag; Open and add pouring slag when watering, open and water pulling rate 0.3～0.6m/min, pulling rate 0.8～1.2m/min normally casts.
4) steel billet is sent into process furnace, the heating of reductibility or neutral atmosphere, and ℃ coming out of the stove in heating steel billet to 1180～1280, carries out high-pressure water descaling;
5) enter roughing, finish rolling, the finish rolling temperature out of rolled piece between 830-900 ℃,
6) cooling and be curled into sheet material, curling temperature is controlled at 675 ± 10 ℃, curling be volume after slow cooling to room temperature.
Preferably, being heated to 1180～1240 ℃ step 4) comes out of the stove.
Preferably, step 5), finishing temperature edge of a wing position control is take 830-860 ℃ as good.
The present invention also provides the application of described chromium-free weather-resistant steel, is used for building, bridge structure.
The invention has the beneficial effects as follows:
1. the smelting of weathering steel of the present invention, rolling technology are simple.Weathering steel alloy addition level of the present invention is few, is mainly the trace interpolation of Mn, Cu, Ni, Nb, B.Production process does not need smelting, rolling process are proposed excessive demand.Approximate with present Q345 rank low-alloy high-strength steel production requirement, and can mix with the Q345 grade product and water, the production process cost satisfies the processing unit requirement of different manufacturers fully.
2. weathering steel excellent performance of the present invention.The mechanical property of product of the present invention is not less than the Q345B product, and is suitable with the Cotton-A steel to the corrosion resisting property of seashore atmosphere or industrial atmosphere.
Embodiment
Following examples are to further illustrate of the present invention, but the present invention is not limited thereto.
Embodiment 1
Chromium-free weather-resistant steel is characterized in that the chemical composition of steel is as follows by quality %:
Steel grade of the present invention is delivered goods with hot-rolled state.Its technical process is respectively:
The Production Flow Chart of H shaped steel:
Be transported to converter after molten iron pre-desulfurization and smelt, adopt the LF refining, make steel grades reach the composition requirement of steel grade of the present invention; Enter near-net-shape casting for shaped blank continuous operation after refining is complete, produce H type near net shape continuous casting blank; Blank adopts cold charge or hot-loading and hot-conveying mode to enter process furnace.Being heated to 1220 ℃ comes out of the stove, carry out high-pressure water descaling, blank after de-scaling delivers to the BD roughing mill by roller-way and the TM finishing train is rolling, BD mill milling extreme trace time rear temperature is controlled between 1030～1080 ℃, then deliver to the TM unit by rollgang, rolling pass is according to the difference of product specification, generally in 5～7 passages.The control of finishing temperature is generally web and is not less than 720 ℃, 850 ± 10 ℃, the edge of a wing.On rollgang, two side wing edges are forced to be cooled to 680 ℃ of left and right air coolings after rolling becoming a useful person, the rolled products size is carried out according to GB GB/T11263-2005.On rolling complete rolled piece, cold bed carries out air cooling.After rolled piece is chilled to below 100 ℃, advances straightener and align.At last, rolled piece is cut scale, collection according to customer requirement.
The strip Production Flow Chart:
Being transported to converter after molten iron pre-desulfurization smelts; Adopt the RH refining, make steel grades reach the composition requirement of steel grade of the present invention; Enter near-net-shape casting for shaped blank continuous operation after refining is complete, produce H type near net shape continuous casting blank; Blank adopts cold charge or hot-loading and hot-conveying mode to enter process furnace.Being heated to 1220 ℃ comes out of the stove, carry out high-pressure water descaling, blank after de-scaling is delivered to by roller-way and is carried out high-pressure water descaling, enter roughing, roughing extreme trace time rear temperature is controlled between 1040 ± 10 ℃, finish rolling, the finish rolling temperature out of rolled piece is between 860 ± 10 ℃ ℃, and curling temperature is controlled at 685 ± 10 ℃, and curling being rolled up rear slow cooling to room temperature.
This steel grade is after rolling becoming a useful person, and its performance test results is as follows:
Embodiment 2
Chromium-free weather-resistant steel is characterized in that the chemical composition of steel is as follows by quality %:
Table 2 steel grade of the present invention is delivered goods with hot-rolled state.Its technical process is respectively:
The Production Flow Chart of H shaped steel:
Be transported to converter after molten iron pre-desulfurization and smelt, adopt the LF refining, make steel grades reach the composition requirement of steel grade of the present invention; Enter near-net-shape casting for shaped blank continuous operation after refining is complete, produce H type near net shape continuous casting blank; Blank adopts cold charge or hot-loading and hot-conveying mode to enter process furnace.Being heated to 1220 ℃ comes out of the stove, carry out high-pressure water descaling, blank after de-scaling delivers to the BD roughing mill by roller-way and the TM finishing train is rolling, BD mill milling extreme trace time rear temperature is controlled between 1030～1080 ℃, then deliver to the TM unit by rollgang, rolling pass is according to the difference of product specification, generally in 5～7 passages.The control of finishing temperature is generally web and is not less than 720 ℃, 850 ± 10 ℃, the edge of a wing.On rollgang, two side wing edges are forced to be cooled to 680 ℃ of left and right air coolings after rolling becoming a useful person, the rolled products size is carried out according to GB GB/T11263-2005.On rolling complete rolled piece, cold bed carries out air cooling.After rolled piece is chilled to below 100 ℃, advances straightener and align.At last, rolled piece is cut scale, collection according to customer requirement.
The strip Production Flow Chart:
Being transported to converter after molten iron pre-desulfurization smelts; Adopt the RH refining, make steel grades reach the composition requirement of steel grade of the present invention; Enter near-net-shape casting for shaped blank continuous operation after refining is complete, produce H type near net shape continuous casting blank; Blank adopts cold charge or hot-loading and hot-conveying mode to enter process furnace.Being heated to 1220 ℃ comes out of the stove, carry out high-pressure water descaling, blank after de-scaling is delivered to by roller-way and is carried out high-pressure water descaling, enter roughing, roughing extreme trace time rear temperature is controlled between 1040 ± 10 ℃, finish rolling, the finish rolling temperature out of rolled piece is between 860 ± 10 ℃ ℃, and curling temperature is controlled at 685 ± 10 ℃, and curling being rolled up rear slow cooling to room temperature.
This steel grade is after rolling becoming a useful person, and its performance test results is as follows:
Embodiment 3
The anti-industrial atmospheric corrosion performance of chromium-free weather-resistant steel.
1) weightening finish experiment.The corrosion test of product steel of the present invention is the alternation of wetting and drying accelerated corrosion test, and test is 30 accelerated corrosion cycles, and the etching time in per cycle is 24h, corrosive environment: 0.52%NaHSO
3Solution, pH value are 4.0, humidity 60RH, 30 ℃ of constant temperature.Detect the weathering resistance of steel by surrosion.Testing data is as shown in the table:
| Weightening finish value Δ W, g/cm 2 | |
| Corten-A | 0.00839 |
| Embodiment 1 | 0.00786 |
| Embodiment 2 | 0.00823 |
2) electrochemical corrosion potential is measured.
Electro-chemical test adopts three-electrode system: working electrode is respectively that area is 10 * 10mm
2The bare board electrode and the band rust electrode of preparation after the corrosion of 30 alternation of wetting and drying cycles, reference electrode is saturated calomel electrode (SCE), supporting electrode is that area is 9cm
2Platinized platinum, adopt salt bridge to be connected between working electrode and reference electrode.Working temperature is room temperature (25 ℃), and all potential values are all the current potentials (SCE) with respect to saturated calomel electrode.Polarization curve (Potentiodynamic) adopts the scanning of Solartron1287 electrokinetic potential, and the scanning potential range is ± 0.2V vs.Ecorr (with respect to corrosion potential) that sweep velocity is 0.1667mV/s.Experiment is at room temperature carried out.Corrosion potential after electrochemical gaging is as follows:
| Corrosion potential E vs.SCE, mV | |
| Corten-A | -596 |
| Embodiment 1 | -579 |
| Embodiment 2 | -588 |
Claims (1)
1. chromium-free weather-resistant steel is characterized in that the chemical composition of steel by quality % is:
C 0.06～0.16, and Si 0.10～0.55, and Mn 0.80～1.70, and P 0.020～0.065, S≤0.015, and Cu 0.15～0.25, Ni≤0.30, Nb≤0.075, B 0.002～0.005; All the other are iron and inevitable impurity;
This steel grade is after rolling becoming a useful person, and its performance reaches the requirement shown in following table:
Product form is the strip product of H shaped steel or 4～40mm;
Described chromium-free weather-resistant steel H shaped steel prepares through the following steps, comprises blast-melted converter steelmaking, LF or RH refining, shaped blank or rectangular billet caster, BD breaking down, finish rolling, cold bed air cooling, aligning, the cutting H shaped steel of becoming a useful person, and specifically comprises the following steps:
1) being transported to converter after molten iron pre-desulfurization smelts; Adopt LF or RH refining, make the chemical composition of steel by quality % be:
C 0.06～0.16, and Si 0.10～0.55, and Mn 0.80～1.70, and P 0.020～0.065, S≤0.015, and Cu 0.15～0.25, Ni≤0.30, Nb≤0.075, B 0.002～0.005; All the other are iron and inevitable impurity;
2) refining enters Hot Metal in Beam Blank or rectangular billet caster operation after complete, produces near net shape continuous casting blank or rectangular bloom blank;
3) blank adopts cold charge or hot-loading and hot-conveying mode to enter process furnace, is heated to 1180～1280 ℃ and comes out of the stove, and carries out high-pressure water descaling;
4) blank that has removed squama delivers to the BD roughing mill by roller-way and the TM finishing train is rolling, and after roughing, temperature is not less than 1090 ℃, the control of finishing temperature to position, the edge of a wing at 830-870 ℃; The rolled products size is carried out according to GB GB/T11263-2005;
5) force cooling to two side wing edges on rollgang after rolling becoming a useful person;
6) on rolled piece, cold bed carries out air cooling;
7) after rolled piece is chilled to below 100 ℃, advances straightener and align;
8) rolled piece cutting is become a useful person H shaped steel, collection;
Described chromium-free weather-resistant steel Strip prepares through the following steps: comprise blast-melted converter steelmaking, LF or RH refining, slab, rolling, cooling, be curled into sheet material, specifically comprise the following steps:
A) being transported to converter after molten iron pre-desulfurization smelts; Adopt LF or RH refining, make the chemical composition of steel by quality % be:
C 0.06～0.16, and Si 0.10～0.55, and Mn 0.80～1.70, and P 0.020～0.065, S≤0.015, and Cu 0.15～0.25, Ni≤0.30, Nb≤0.075, B 0.002～0.005; All the other are iron and inevitable impurity;
B) before the molten steel departures, feeding 500m～700 m Si-Ca lines carry out calcification processing; The liquidus temperature of molten steel is 1500～1550 ℃, refining time 20～60 minutes, and 6～20 minutes soft blow time, soft blow requires molten steel fine motion in bag, and molten steel must not be exposed;
C) continuous casting, the whole process protection cast, covering slag adopts the container plate covering slag; Open and add pouring slag when watering, open and water pulling rate 0.3～0.6m/min, pulling rate 0.8～1.2m/min normally casts;
D) steel billet is sent into process furnace, the heating of reductibility or neutral atmosphere, and ℃ coming out of the stove in heating steel billet to 1180～1280, carries out high-pressure water descaling;
E) enter roughing, finish rolling, the finish rolling temperature out of rolled piece between 830-900 ℃,
F) cooling and be curled into sheet material, curling temperature is controlled at 675 ± 10 ℃, curling be volume after slow cooling to room temperature.
2. chromium-free weather-resistant steel as claimed in claim 1, is characterized in that step 2) described near net shape continuous casting blank is H type near net shape continuous casting blank.
3. chromium-free weather-resistant steel as claimed in claim 1, is characterized in that, is heated to 1180～1240 ℃ in step 3) and comes out of the stove.
4. chromium-free weather-resistant steel as described in claim 1～3 any one, is characterized in that, in step 4), finishing temperature edge of a wing position control is at 830-850 ℃.
5. chromium-free weather-resistant steel as described in claim 1～3 any one, is characterized in that in step 4), finishing temperature edge of a wing position control at 830-850 ℃, is carried out slow cooling to the H shaped steel after rolling in step 5).
6. chromium-free weather-resistant steel as claimed in claim 1, is characterized in that, step D) in be heated to 1180～1240 ℃ and come out of the stove; Step e) in, finishing temperature edge of a wing position control is take 830-860 ℃ as good.
7. the application of chromium-free weather-resistant steel as claimed in claim 1 is used for building, bridge structure.
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| CN102586684B (en) * | 2012-02-28 | 2013-11-13 | 莱芜钢铁集团有限公司 | H-shaped steel for nuclear power structure and manufacturing method of H-shaped steel |
| CN105624549B (en) * | 2015-12-29 | 2017-07-07 | 武钢集团昆明钢铁股份有限公司 | A kind of 345MPa grades of antidetonation fire-resistant and weather-resistant steel and preparation method thereof |
| CN108251737B (en) * | 2018-02-23 | 2019-12-17 | 柳州钢铁股份有限公司 | Manufacturing method of high-strength weathering steel with yield strength of 550MPa |
| CN112030058B (en) * | 2020-08-28 | 2022-01-04 | 广州大学 | Method for producing Ti microalloyed Q345B steel grade and Q345B steel grade by TMCP process |
| CN115418559B (en) * | 2022-07-20 | 2023-11-07 | 山东钢铁股份有限公司 | High-strength and high-toughness hot rolled H-shaped steel for building and preparation method thereof |
| CN115637386B (en) * | 2022-11-02 | 2023-07-28 | 宁波星科金属材料有限公司 | High-strength weather-resistant steel for highway guardrails and preparation method of highway guardrails |
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