CN101144139A - Steel for high-strength weather-proof low-alloy electric force bar and preparing method thereof - Google Patents
Steel for high-strength weather-proof low-alloy electric force bar and preparing method thereof Download PDFInfo
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Abstract
The present invention relates to steel with high intensity and weatherability used for low alloy power rods and the preparation method thereof. The weathering steel has the chemical composition and the weight percentage content that C is 0.06-0.12 percent, Si is 0.15-0.35 percent, Mn is 1.0-1.40 percent, S is less than or equal to 0.030 percent, P is less than or equal to 0.030 percent, Cu is 0.15-0.30 percent, Al is less than 0.04 percent, Nb is 0.01-0.03 percent, and the residual is Fe and microimpurity. The present invention performs combined blown converter smelting, LF ladle refining, soft argon blowing, and sheet billet continuous casting by using the prior equipment and the conventional process production, and performs microalloying treatment through adjusting the content of partial elements. By accurately controlling the processing condition, the economic weathering steel with good atmospheric corrosion resistant performance and comprehensive mechanical performance can be produced.
Description
Technical field
The present invention relates to a kind of high-strength weather-proof low-alloy steel and preparation method thereof, belong to the low alloy steel field, particularly economical steel for high-strength weather-proof low-alloy electric force bar and preparation method thereof.
Background technology
China's iron tower mainly was Q235 and Q345 with the strength grade of steel in the past, also the use of minute quantity once Q390.Along with the development of iron tower to big load and maximization, the domestic high-strength steel that begins to adopt higher category such as Q420, by contrast, Q420 has significantly economic technology advantage.As make the main material of iron tower with Q420, not only can reduce tower weight 6%～8%.Also reduced cross-arm master material specification.In theory, owing to reduced keep out the wind area thereby reduced the body of the tower blast of body of the tower; From economic angle, use the Q420 high-strength steel can save overall cost 2%～6%.The main difference of Here it is homemade Hi-Stren steel and ordinary low-alloy steel.Q420 alloying constituent and weight percent content are: C :≤0.20, Si :≤0.55%, Mn:1.00～1.7, S≤0.035, P≤0.035, V:0.02～0.20, Nb:0.015～0.060, Ti:0.02～0.20, Al 〉=0.015, all the other are Fe and trace impurity.But add strong carbide forming element such as Nb, V, Ti, properties of weld causes detrimentally affect; In addition. hot rolling is generally adopted in the smelting of homemade high-strength steel.Do not add refining procedure.This just makes its performance stable inadequately.In addition, long-term exposure is used in air, and this steel grades does not contain Cu, P, does not possess weather-proof condition, and is perishable.Referring to " heat processing technique " 2007 the 36th volumes the 3rd phase Han Yu P43～45.
Chinese invention patent CN1800428 discloses " a kind of economy type weathering-resistant steel " in 2006.07.12 and has related to the low alloy steel field, particularly the low-alloy structural carbon steel of economical atmospheric corrosion resistance is mainly used in railway, vehicle, bridge, pylon etc. and is exposed to the steel construction that uses in the atmosphere for a long time.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 part constituent content of ordinary low-carbon steel (Q235 steel), produce have good atmospheric corrosion resistance, the economical and weather resistant steel of comprehensive mechanical performance.But there are several problems in this invention: this steel carbon equivalent is higher, and the cold crack index is higher, and welding property is not fine, and composition range is very wide.
USS: ASTM A 572/A 572M-01 also provide a kind of steel chemical composition, and is as shown in table 1.
Table 1 chemical ingredients (%wt)
| Grade | The C maximum value | Mn | P | S | Si |
| Maximum value | Maximum value | Maximum value | Plate thickness is less than [40mm] | ||
| Maximum value | |||||
| 50[345] | 0.25 | 1.35 | 0.04 | 0.05 | 0.4 |
Annotate: this steel grade can use niobium, vanadium, titanium, nitrogen or their bonded schedule of reinforcements, and this steel series also contains alloying element cu simultaneously, and the main effect of Cu is to make steel plate have good corrosion resistant performance.
Summary of the invention
The present invention is directed to the deficiencies in the prior art, a kind of economical steel for high-strength weather-proof low-alloy electric force bar and preparation method thereof is provided.
Technical scheme of the present invention is as follows:
A kind of steel for high-strength weather-proof low-alloy electric force bar, wherein the chemical component weight degree of steel is:
C:0.06～0.12%, Si:0.15～0.35%, Mn:1.0～1.40%, S≤0.030%, P≤0.030%, Cu:0.15～0.30%, Al＜0.04%, Nb:0.01～0.03%, all the other are Fe and trace impurity.
Determining of steel grades: the at first requirement of proof strength is the requirement of welding property once more, and promptly carbon equivalent can not be high, is the requirement of weather resistance then.Requirement based on intensity and welding property, the control carbon content is 0.06～0.12%, the loss of Mn:1.0～1.40%, intensity remedies by adding the Nb microalloying, control Nb:0.01～0.03%, weather resistance selects for use the best Cu of effect to handle, and the present invention controls Cu:0.15～0.30%, in addition for guaranteeing the cleanliness factor of molten steel, the present invention has still proposed the control requirement, S≤0.030%, P≤0.030%, Al＜0.04% to elements such as S, P, Al.
Further preferred, the chemical component weight per-cent target content of steel is:
C:0.07%, Si:0.25%, Mn:1.25%, S≤0.02%, P≤0.030%, Cu:0.23%, Al＜0.04%, Nb:0.015%, all the other are Fe and trace impurity.
A kind of preparation method of high-strength weather-proof low-alloy steel comprises hot metal pretreatment, combined blown converter smelting, LF ladle refining, soft blow argon, sheet billet continuous casting, and 1500 broadbands are rolling, it is characterized in that, the chemical component weight degree of control steel is:
C:0.06～0.12%, Si:0.15～0.35%, Mn:1.0～1.40%, S≤0.025%, P≤0.030%, Cu:0.15～0.30%, Al＜0.04%, Nb:0.01～0.03%, all the other are Fe and trace impurity.The controlled rolling temperature is as follows: inferior temperature 1025-1055 ℃ of roughing extreme trace, finish rolling finishing temperature: 875-905 ℃, coiling temperature: 600-630 ℃, laminar flow cooling adopts the head 5-8m need not water-cooled mode, process furnace is reductibility or the heating of neutral atmosphere, is controlled at heat-up time 1-2 hour.
This steel grade contains alloy element Nb, the controlled rolling temperature, guarantees to be rolled 1 in the temperature range of regulation) roughing extreme trace time temperature: 1040 ± 15 ℃.2) finish rolling finishing temperature: 890 ° ± 15 ℃.Batch according to the steel grade performance characteristics, 5m need not water-cooled mode at least to roll back laminar flow cooling employing head.Coiling temperature: 615 ± 15 ℃.This steel grade Cu content is higher simultaneously, must guarantee that process furnace is reductibility or the heating of neutral atmosphere, reduces heat-up time (being controlled in 2 hours), prevents over oxidation, avoids steel that the limit takes place when rolling and splits.
Further preferred, the preparation method of high-strength weather-proof low-alloy steel can consider that following processing condition operate:
1, hot metal pretreatment
Hot metal pretreatment is to adopt winding-up magnesium grain to carry out desulfurizing iron in iron ladle, and molten iron sulphur is controlled at below 0.020%, and temperature is not less than 1250 ℃, and desulfurization finishes and scratches clean the slag on molten iron surface.
2, converter smelting
Pretreated molten iron enters converter smelting, and the slag making material added in terminal point in preceding 3 minutes.Terminal point control: C＜0.08%, S＜0.025%.At first add synthetic slag before the converter tapping at the bottom of ladle, adopt the deoxidation of aluminium manganese titanium, consumption 2kg/t molten steel is being put steel four/for the moment, add silicomanganese, middle manganese, aluminium manganese titanium, Cu grain, Nb iron, and molten steel goes out to 3/4ths o'clock to add.Above-mentioned synthetic slag and dosage all by prior art all can, generally be about every stove dosage 800kg.
3.LF ladle refining
Molten steel behind the converter smelting enters refining furnace, and it is concise to adopt the operation of white slag method to carry out, and the white slag hold-time was greater than 12 minutes.Feed 500m-700m Si-Ca line in the molten steel after refining again and carry out calcification processing, and soft blow argon gas 12-20 minute improves the molten steel cleanliness factor to remove being mingled with in the steel.
The white slag method mainly is after the slag fusing forms, and adds the CaSi powder and makes slag have reductibility, and slag is bleached.Refining slag contains Ca0〉50%, in making the white slag processing,, also can take to add an amount of aluminum shot and carry out deoxidation in order to quicken the slag deoxidation.The white slag slag of making is uniform vesicle end, and with slag rod dry slag, slag blanket is even, the cooling rear surface roe shape that is white in color, and section white band grey or fine rule, and loose porous, can automatic efflorescence become white powder after the cooling.This is optimal white slag.White slag can effectively be removed steel inclusion.
4, sheet billet continuous casting
The whole process protection cast, the Gr50 covering slag that covering slag adopts Henan Xi Bao group to produce.For guaranteeing continuous casting billet quality, reduce crackle, two cold employings are weak cold, and the specific water takes 0.9-1.2L/Kg.This steel grade contains alloy element Nb, and crack sensitivity increases, and pays special attention to the even cooling of strand, and the control strand goes out the difference of straightening machine width surface temperature and leptoprosopy temperature less than 40 ℃.
5,1500 broadbands are rolling
Rolling employing four roll reversing rollers carry out 5 passage roughing, carry out finish rolling with six tandem rolling units.Inferior temperature: 1025-1055 ℃ of roughing extreme trace, finish rolling finishing temperature: 875-905 ℃, coiling temperature: 600-630 ℃.
High-strength weather-proof low-alloy steel of the present invention is a kind of economical low-alloy of anti-marquis carbon steel, is applicable to that railway, vehicle, bridge, pylon etc. are exposed to the manufacturing of the steel construction piece that uses in the atmosphere for a long time, are specially adapted to the manufacturing of electric power bar.Beneficial effect compared with prior art of the present invention is as follows:
High-strength weather-proof low-alloy steel of the present invention provides more accurate C, P, S span of control, and has also provided the span of control of Cu, Nb; The STEELMAKING PRODUCTION cost of alloy is lower, the stable easily control of production process, the also stable easily control of chemical ingredients.This invention have good weather-proof effect, and this invention carbon equivalent is low owing to added the Cu element, and welding property is good, meets every requirement, has the favorable mechanical performance, and its yield strength, tensile strength, unit elongation all are higher than currently available products.
Embodiment
Below in conjunction with embodiment the present invention is further described, but is not limited thereto.
Embodiment 1:
1, the chemical component weight per-cent of weathering steel is as follows:
C:0.07%, Si:0.25%, Mn:1.25%, S:0.012%, P:0.015%, Cu:0.23%, Al:0.024%, Nb:0.021%, all the other are Fe and trace impurity.
2, the manufacture method of weathering steel, the technological process of production comprise that hot metal pretreatment, combined blown converter smelting, LF ladle refining, soft blow argon, sheet billet continuous casting, 1500 broadbands are rolling.Operation steps is as follows:
Adopt winding-up magnesium grain to carry out desulfurizing iron in iron ladle, molten iron sulphur is controlled at below 0.020%, and temperature is not less than 1250 ℃, and desulfurization finishes and scratches clean the slag on molten iron surface.Pretreated molten iron enters converter smelting, and the slag making material added in terminal point in preceding 3 minutes.
Terminal point control: C:0.07%, S:0.020%.At first at the bottom of ladle, add the 800kg synthetic slag before the converter tapping.Adopt the deoxidation of aluminium manganese titanium, consumption 2kg/t is being put steel four/for the moment, add silicomanganese, middle manganese, aluminium manganese titanium, Cu grain, Nb iron, and molten steel goes out to 3/4ths o'clock to add.Molten steel behind the converter smelting enters concise stove, and it is concise to adopt the operation of white slag method to carry out, 14 minutes LF white slag hold-times.Feeding 550m Si-Ca line carries out calcification processing in the molten steel after refining, and soft blow argon gas 14 minutes.Sheet billet continuous casting is by the cast of continuous caster whole process protection, the Gr50 covering slag that covering slag adopts Henan Xi Bao group to produce.Two cold employings are weak cold, and the specific water takes 1.05L/Kg.The control strand goes out the difference of straightening machine width surface temperature and leptoprosopy temperature less than 40 ℃.
The continuously cast bloom specification is that 160mm * 1260mm * 11700mm Finished Steel specification is: 4.1*1210
The controlled rolling temperature guarantees to be rolled 1 in the temperature range of regulation) roughing extreme trace time temperature: 1040 ± 15 ℃.2) finish rolling finishing temperature: 890 ℃ ± 15 ℃ are batched according to the steel grade performance characteristics, and rolling back laminar flow cooling employing head 5m need not water-cooled mode.Coiling temperature: 615 ± 15 ℃.This steel grade Cu content is higher simultaneously, must guarantee that process furnace is reductibility or the heating of neutral atmosphere, is controlled at heat-up time in 2 hours, prevents over oxidation, avoids steel that the limit takes place when rolling and splits.The rigidity of present embodiment can be listed in the table 1.Performance test methods adopts international method.
Embodiment 2:
1, the chemical component weight per-cent of weathering steel is as follows:
C:0.08%, Si:0.22%, Mn:1.21%, S:0.010%, P:0.012%, Cu:0.25%, Al:0.034%, Nb:0.025%, all the other are Fe and trace impurity.
2, the manufacture method of weathering steel, the technological process of production comprise that hot metal pretreatment, combined blown converter smelting, LF ladle refining, soft blow argon, sheet billet continuous casting, 1500 broadbands are rolling.Operation steps is as follows:
Adopt winding-up magnesium grain to carry out desulfurizing iron in iron ladle, molten iron sulphur is controlled at below 0.02%, and temperature is not less than 1250 ℃, and desulfurization finishes and scratches clean the slag on molten iron surface.Pretreated molten iron enters converter smelting, and the slag making material added in terminal point in preceding 3 minutes.Terminal point control and other process are with embodiment 1.
The rigidity of present embodiment can be listed in the table 1.Performance test methods adopts international method.
Table 1: rigidity energy
| Steel | Thickness of slab | Yield strength MPa | Tensile strength MPa | Welding cold crack sensitivity indices P cm. | (laterally) tensile property MPa | Unit elongation (%) |
| Embodiment 1 | 4.1 | 455 | 540 | 0.15 | 525 | 34 |
| Embodiment 2 | 4.1 | 480 | 560 | 0.16 | 530 | 31.5 |
| SPA-H (contrast) | 4.5 | 390 | 470 | 0.20 | 450 | 24 |
Claims (8)
1. high-strength weather-proof low-alloy steel, wherein the chemical component weight per-cent of steel is:
C:0.06～0.12%, Si:0.15～0.35%, Mn:1.0～1.40%, S≤0.030%, P≤0.030%, Cu:0.15～0.30%, Al＜0.04%, Nb:0.01～0.03%, all the other are Fe and trace impurity.
2. high-strength weather-proof low-alloy steel as claimed in claim 1 is characterized in that the chemical component weight per-cent of steel is:
C:0.07%, Si:0.25%, Mn:1.250%, S≤0.02%, P≤0.030%, Cu:0.23%, Al＜0.04%, Nb:0.015%, all the other are Fe and trace impurity.
3. the preparation method of a high-strength weather-proof low-alloy steel comprises hot metal pretreatment, combined blown converter smelting, LF ladle refining, soft blow argon, sheet billet continuous casting, and 1500 broadbands are rolling, it is characterized in that, the chemical component weight degree of control steel is:
C:0.06～0.12%, Si:0.15～0.35%, Mn:1.0～1.40%, S≤0.030%, P≤0.030%, Cu:0.15～0.30%, Al＜0.04%, Nb:0.01～0.03%, all the other are Fe and trace impurity; The controlled rolling temperature is as follows: inferior temperature 1025-1055 ℃ of roughing extreme trace, finish rolling finishing temperature: 875-905 ℃, coiling temperature: 600-630 ℃, laminar flow cooling adopts the head 5-8m need not water-cooled mode, process furnace is reductibility or the heating of neutral atmosphere, is controlled at heat-up time 1-2 hour.
4. the preparation method of high-strength weather-proof low-alloy steel as claimed in claim 3, it is characterized in that described hot metal pretreatment is to adopt winding-up magnesium grain to carry out desulfurizing iron in iron ladle, molten iron sulphur is controlled at below 0.020%, and temperature is not less than 1250 ℃, and desulfurization finishes and scratches clean the slag on molten iron surface.
5. the preparation method of high-strength weather-proof low-alloy steel as claimed in claim 3 is characterized in that described converter smelting is that pretreated molten iron enters converter smelting, and the slag making material added in terminal point in preceding 3 minutes, terminal point control: C＜0.08%, S＜0.025%.At first add synthetic slag before the converter tapping at the bottom of ladle, adopt the deoxidation of aluminium manganese titanium, consumption 2kg/t is being put steel four/for the moment, add silicomanganese, middle manganese, aluminium manganese titanium, Cu grain, Nb iron, and molten steel goes out to 3/4ths o'clock to add.
6. the preparation method of high-strength weather-proof low-alloy steel as claimed in claim 3, it is characterized in that described LF ladle refining is that molten steel behind the converter smelting enters concise stove, adopt the operation of white slag method to carry out concise, the white slag hold-time was greater than 12 minutes, feeding 500m-700mSi-Ca line carries out calcification processing in the molten steel after refining, and soft blow argon gas 12-20 minute.
7. the preparation method of high-strength weather-proof low-alloy steel as claimed in claim 3; it is characterized in that described sheet billet continuous casting is the whole process protection cast; covering slag adopts the Gr50 covering slag; two cold employings are weak cold; specific water 0.9-1.2L/Kg, the control strand goes out the difference of straightening machine width surface temperature and leptoprosopy temperature less than 40 ℃.
8. the preparation method of high-strength weather-proof low-alloy steel as claimed in claim 3, it is characterized in that described 1500 broadbands rolling be to adopt four roll reversing rollers to carry out, 5 passage roughing are carried out finish rolling with six tandem rolling units.
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| CN102181597A (en) * | 2011-04-08 | 2011-09-14 | 马鞍山钢铁股份有限公司 | Converter less slag smelting method based on Cu-P system weathering steel |
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| CN102994875A (en) * | 2012-11-16 | 2013-03-27 | 济钢集团有限公司 | Weathering steel and manufacturing method thereof |
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| CN102127710B (en) * | 2011-04-07 | 2013-06-12 | 莱芜钢铁集团有限公司 | Chromium-free weather-resistant steel |
| CN102127710A (en) * | 2011-04-07 | 2011-07-20 | 莱芜钢铁集团有限公司 | Chromium-free weather-resistant steel |
| CN102181597A (en) * | 2011-04-08 | 2011-09-14 | 马鞍山钢铁股份有限公司 | Converter less slag smelting method based on Cu-P system weathering steel |
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| CN102994875A (en) * | 2012-11-16 | 2013-03-27 | 济钢集团有限公司 | Weathering steel and manufacturing method thereof |
| CN105734198A (en) * | 2016-04-20 | 2016-07-06 | 中天钢铁集团有限公司 | Manufacturing method for smelting phosphorus-containing weathering-resistant steel through EAF-converter |
| CN105734198B (en) * | 2016-04-20 | 2018-06-08 | 中天钢铁集团有限公司 | A kind of preparation method of the phosphorous weathering steel of electricity converter smelting |
| CN113846261A (en) * | 2021-09-28 | 2021-12-28 | 唐山瑞丰钢铁（集团）有限公司 | Production method of cold-rolled steel strip for titanium microalloyed refrigerator side plate steel under non-refining process condition |
| CN113846261B (en) * | 2021-09-28 | 2022-12-09 | 唐山瑞丰钢铁（集团）有限公司 | Production method of cold-rolled steel strip for titanium microalloyed refrigerator side plate steel under non-refining process condition |
| CN114774776A (en) * | 2022-03-25 | 2022-07-22 | 安阳钢铁集团有限责任公司 | Cold-rolled low-alloy high-strength steel and production method thereof |
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