CN101875994A - Novel weathering resistant steel microalloying compound core-spun yarn - Google Patents
Novel weathering resistant steel microalloying compound core-spun yarn Download PDFInfo
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- CN101875994A CN101875994A CN2010101403035A CN201010140303A CN101875994A CN 101875994 A CN101875994 A CN 101875994A CN 2010101403035 A CN2010101403035 A CN 2010101403035A CN 201010140303 A CN201010140303 A CN 201010140303A CN 101875994 A CN101875994 A CN 101875994A
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Abstract
The invention discloses a novel weathering resistant steel microalloying compound core-spun yarn comprising a steel sheath and a powdery inner core, wherein the powdery inner core is composed of the following chemical ingredients in percentage by weight: 20% of Ca, 0.5% of Mg, 38% of Si, 1.2% of Ba, 1.9% of rare-earth metal, 3.2% of Zr, 1.6% of Ti, 0.5% of B, 0.9% of Mo, 0.5% of Mn, 0.9% of Nb, 0.6% of V and the balance of Fe and inevitable impurity. The invention can obviously refine steel microstructure, improves the decay resistance of steel and lowers C, P and S content in steel by reasonably designing the chemical ingredients; and meanwhile the invention can reduce the amount of parts of alloy elements in steel so as to lower cost.
Description
Technical field
The present invention relates to a kind of cored-wire, especially relate to a kind of novel weathering resistant steel microalloying compound core-spun yarn.
Background technology
Along with developing rapidly of China's economic construction, all trades and professions all need a large amount of Hi-Stren steel.But by being that China region is wide, weather condition differ greatly, and railway, vehicle, bridge, pylon, pipeline etc. are exposed to the steel construction that uses in the atmosphere for a long time and corrode especially easily.Because reason for corrosion, annual China has the iron structure of 10-20% to become waste, therefore brings enormous economic loss to society.Though developed a series of corrosion-resistant steel at present in the industry, as 09CuPCrNi weathering steel etc.Yet existing weathering steel generally have corrosion resistance nature limited, contain the Cu height (the Cu element is too high, be easy to generate during hot-work hot-short, and may influence the welding property of steel), many technical problems that cost is high, therefore be difficult to adapt to the needs of economic construction.
Summary of the invention
The purpose of this invention is to provide a kind of novel weathering resistant steel microalloying compound core-spun yarn, be used to solve existing weathering steel and contain the Cu height, corrosion resistance nature is limited, cost high-technology problem.
Above-mentioned technical problem of the present invention is mainly solved by following technical proposals:
This cored-wire comprises steel crust and powdery inner core, and described powdery inner core is made by described mass percent by following chemical components: Ca:15～20%, Mg:0.5～0.7%, Si:35～44.5%, Ba:1.0～1.5%, rare earth metal: 1.5～3%, Zr:2.5～4.0%, Ti:1.2～1.8%, B:0.3～0.7%, Mo:0.8～1.2%, Mn:0.3～0.6%, Nb:0.8～1.2%, V:0.5～0.9%, surplus is iron and unavoidable impurities.
As preferably, element components and mass percent in the described powdery inner core are: Ca:20%, Mg:0.5%, Si:38%, Ba:1.2%, rare earth metal: 1.9%, Zr:3.2%, Ti:1.6%, B:0.5%, Mo:0.9%, Mn:0.5%, Nb:0.9%, V:0.6%, surplus is iron and unavoidable impurities.
Utilize composite core-spun yarn to form high-melting-point in some alloying element feeding molten steel, to make the crystal refinement of steel play strengthening effect to steel, appointed the coarse grain zone when particularly the structure iron large-line energy welded so high toughness, and the steel construction that long-term exposure is used in atmosphere has good atmospheric corrosion resistance.The present invention is obvious to the improvement effect of steel performance, can significantly improve steel strength.The present invention adds in the molten steel, can improve the recovery rate of alloying element greatly, improves the utilization ratio of noble metal composition, has reduced the cost that steel are made.
Ca improves the form of inclusion and the clarity of distribution cleaning molten steel in the cored-wire of the present invention, improves the quality of steel.The content of Ca in the cored-wire is controlled in Ca.18～28%, can improves the flowing property of molten steel and the quality of steel.
Si improves the intensity of sosoloid in the steel and toughness and plasticity that the cold hardening degree makes steel reduce.And Si and Ca play the combined deoxidation effect, can take away oxygen with separation of oxygenated and separation of vaporization effect from molten metal, and the content of Si is controlled in Si35～44.5% in the cored-wire, has good deoxidation effect, also can improve the steel corrosion resistance nature simultaneously.
Ba is an active element, can reduce inclusion content in the molten steel, increase molten steel flow, makes molten steel more even.
Compound use Ca, Ba deoxidation, its product can form the polynary body that dissolves each other, and reduce the activity and the fusing point of deoxidation products.Ba can play the effect that promotes Ca, helps deoxidation and carries out, and makes the molten steel purifying better effects if, helps steel inclusion and assembles come-up.
Compound use Ca, Ba deoxidation, reaction product is low-melting composite oxides, helps steel inclusion and assembles come-up.And can reduce the activity and the fusing point of deoxidation products, help deoxidation and carry out, make the molten steel purifying better effects if.
Rare earth metal claims rare earth element again, is the general name of scandium in the periodic table of elements IIIB family, yttrium, 17 kinds of elements of group of the lanthanides, and the toughness plasticity that the rare earth element in the cored-wire can improve steel is transverse impact toughness particularly, improves the anisotropy of steel.And rare earth can also purify and strengthen crystal boundary, hinders the formation and the expansion of intergranular crack, helps improving especially high-temp plastic of plasticity; In addition, rare earth can also promote carbon (nitrogen) the change thing of Nb in the ferrite, Ti, V etc. to separate out, and the The Nomenclature Composition and Structure of Complexes that changes cementite also makes carbide spheroidization, refinement and uniform distribution, has therefore improved the atmospheric corrosion resistance of steel greatly.
V (vanadium) but thinning microstructure crystal grain improves intensity and toughness.And the carbide that V and C form can improve the anti-hydrogen-type corrosion ability of anti-steel under High Temperature High Pressure.
Mo (molybdenum) can make the grain refining of steel, improves hardening capacity and heat resistance energy, and element combinations such as Mo and Si have the steel erosion resistance of raising and oxidation resistant effect.
The B of trace can strengthen crystal boundary, plays the crystal grain thinning effect.And interact with a certain proportion of Ti, rare earth metal, steel have been played very strong crystal grain thinning effect.
Nb (niobium) has the effect of crystal grain thinning, significantly suppresses austenitic recrystallize, improves recrystallization temperature, prevents that the intergranular corrosion phenomenon from taking place, and improves anti-hydrogen, nitrogen, ammonia corrosion ability under soft steel weather-resistant and the high temperature.
Zr (zirconium) can reduce the deleterious effect of N, forms nitride in steel, can crystal grain thinning, and suppress growing up of austenite crystal, thereby improve the mechanical property of steel, particularly improve the cracking resistance line extended capability of steel.
In sum, the present invention is by reasonably designing chemical ingredients, can allow the remarkable refinement of steel microscopic structure, improves the corrosion resistance nature of steel, and can reduce the content of C in the steel, P, S; Simultaneously can also reduce part alloying element consumption in the steel, to reduce cost.After adopting cored-wire of the present invention that molten steel is carried out denaturing treatment, need not change under the existing steel manufacturing condition, have good atmospheric corrosion resistance by not adding Cu or add Cu less, just can producing, a weathering steel of high comprehensive performance, use economy.
Description of drawings
Fig. 1 is the correlated bar graph of the corrosion weight loss of each sample of the present invention.
Embodiment
Below in conjunction with embodiment the present invention is further described in detail:
Embodiment 1: the granularity of cored-wire powdery inner core is 1～1.5 millimeter, its powdery inner core is packed into the cored-wire of 13 millimeters of diameters by the carbon steel crust.Its medium carbon steel crust employing thickness is 0.3～0.4 millimeter 08A2 steel band, and element components and mass percent in the described powdery inner core are: Ca:15%, Mg:0.7%, Si:44.5%, Ba:1.5%, rare earth metal: 1.5%, Zr:2.5%, Ti:1.8%, B:0.3%, Mo:0.8%, Mn:0.3%, Nb:0.8%, V:0.5%, surplus is iron and unavoidable impurities.
Embodiment 2: the granularity of cored-wire powdery inner core is 1～1.5 millimeter, its powdery inner core is packed into the cored-wire of 13 millimeters of diameters by the carbon steel crust.Its medium carbon steel crust employing thickness is 0.3～0.4 millimeter soft steel steel band, and element components and mass percent in the described powdery inner core are: Ca:20%, Mg:0.5%, Si:38%, Ba:1.2%, rare earth metal: 1.9%, Zr:3.2%, Ti:1.6%, B:0.5%, Mo:0.9%, Mn:0.5%, Nb:0.9%, V:0.6%, surplus is iron and unavoidable impurities.
Embodiment 3: the granularity of cored-wire powdery inner core is 1～1.5 millimeter, its powdery inner core is packed into the cored-wire of 13 millimeters of diameters by the carbon steel crust.Its medium carbon steel crust employing thickness is 0.3～0.4 millimeter 08A2 steel band, and element components and mass percent in the described powdery inner core are: Ca:18%, Mg:0.6%, Si:35%, Ba:1.0%, rare earth metal: 3%, Zr:4.0%, Ti:1.2%, B:0.7%, Mo:1.2%, 0.8%, V:0.9%, surplus is iron and unavoidable impurities.
Embodiment 4: the granularity of cored-wire powdery inner core is 1～1.5 millimeter, its powdery inner core is packed into the cored-wire of 13 millimeters of diameters by the carbon steel crust.Its medium carbon steel crust employing thickness is 0.3～0.4 millimeter 08A2 steel band, and element components and mass percent in the described powdery inner core are: Ca:16%, Mg:0.5%, Si:42%, Ba:1.4%, rare earth metal: 2.5%, Zr:3%, Ti:1.6%, B:0.6%, Mol.0%, Mn:0.3%, Nb:0.9%, V:0.7%, surplus is iron and unavoidable impurities.
In order further to verify effect of the present invention, the contriver has carried out following performance comparison test:
One. the cored-wire that adopts embodiment 3 to obtain, the amount that adds 2 kilograms of powdery inner cores by Q235 steel molten steel per ton feeds cored-wire.Slag specimen is analyzed before and after then cored-wire being added, and it the results are shown in Table 1.
Slag specimen analysis (Wt%) before and after table 1 cored-wire adds
As can be seen from Table 1: add that each component content this shows all obviously greater than the slag specimen that does not add in the slag specimen behind the cored-wire of the present invention, the adding of cored-wire of the present invention more helps the come-up of slag in the steel.
Two. the cored-wire that embodiment 2 is obtained is used for the continuous casting of the structure iron of anti-marquis (Q235 steel) and smelts, during external refining, the amount that adds 2 kilograms of powdery inner cores by molten steel per ton feeds cored-wire, and chemical ingredients and every performance of steel plate were analyzed before and after cored-wire was added.(steel billet that embodiment 2 cored-wires obtain before adding is a Sample A, and the steel billet that cored-wire obtains after adding is a sample B).
Table 2: the chemical ingredients test of steel billet
As can be seen from Table 2, after cored-wire of the present invention added, the objectionable impurities C in the steel, P, S descended obviously, and the increase of Mo, Nb and rare earth element then helps improving the over-all properties of steel in the steel.
Three. the cored-wire that embodiment 2～4 is obtained is used for the continuous casting smelting of rail vehicle with weathering steel, during external refining, the amount that adds 2 kilograms of powdery inner cores by molten steel per ton feeds cored-wire, and Mechanics Performance Testing was carried out in the steel billet sampling before and after cored-wire was added, and its result is as shown in table 2.(the steel billet sample that embodiment 2 cored-wires obtain before adding is a Sample A 1, and the steel billet sample that this cored-wire obtains after adding is a sample B 1; The steel billet sample that embodiment 3 cored-wires obtain before adding is a Sample A 2, and the steel billet sample that this cored-wire obtains after adding is a sample B 2; The steel billet sample that embodiment 4 cored-wires obtain before adding is a Sample A 3, and the steel billet sample that this cored-wire obtains after adding is a sample B 3.)
Table 3: the chemical ingredients test that steel is bad
| Steel grade | Yield strength MPa | Tensile strength MPa | Elongation % | Ferrite grain size (um) |
| Sample A 1 | ??225 | ??455 | ??25 | ??9.2 |
| Sample A 2 | ??235 | ??430 | ??24 | ??8.8 |
| Sample A 3 | ??235 | ??445 | ??24 | ??7.6 |
| Sample B 1 | ??267 | ??510 | ??28 | ??5.1 |
| Sample B 2 | ??275 | ??505 | ??29 | ??4.96 |
| Sample B 3 | ??285 | ??495 | ??30 | ??4.56 |
As can be seen from Table 3, after cored-wire of the present invention added in the molten steel, the size of the crystal grain of steel was littler, and the yield strength and the tensile strength of steel are improved significantly.
Four. with above-mentioned rail vehicle weathering steel steel billet Sample A 1～A3, B1～B3 is used for week soaking test.Soak in week in the test, the corrosion weight loss of several steel plates is seen shown in Figure 1.From Fig. 1 as seen, (the corrosion weight loss amount that is Sample A 1～A3) is that the steel that adds cored-wire (is more than 2 times of sample B 1～B3) not add the steel of cored-wire.
Claims (2)
1. novel weathering resistant steel microalloying compound core-spun yarn, comprise steel crust and powdery inner core, it is characterized in that described powdery inner core made by described mass percent by following chemical components: Ca:15～20%, Mg:0.5～0.7%, Si:35～44.5%, Ba:1.0～1.5%, rare earth metal: 1.5～3%, Zr:2.5～4.0%, Ti:1.2～1.8%, B:0.3～0.7%, Mo:0.8～1.2%, Mn:0.3～0.6%, Nb:0.8～1.2%, V:0.5～0.9%, surplus are iron and unavoidable impurities.
2. novel weathering resistant steel microalloying compound core-spun yarn according to claim 1 is characterized in that element components and the mass percent in the described powdery inner core is: Ca:20%, Mg:0.5%, Si:38%, Ba:1.2%, rare earth metal: 1.9%, Zr:3.2%, Ti:1.6%, B:0.5%, Mo:0.9%, Mn:0.5%, Nb:0.9%, V:0.6%, surplus is iron and unavoidable impurities.
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| CN106521084A (en) * | 2016-11-18 | 2017-03-22 | 浙江宝信新型炉料科技发展有限公司 | Rare earth magnesium alloy cored wire containing multiple elements |
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| CN106521085A (en) * | 2016-11-18 | 2017-03-22 | 浙江宝信新型炉料科技发展有限公司 | Multi-element rare earth magnesium alloy powder of cored wire |
| CN106521087A (en) * | 2016-11-18 | 2017-03-22 | 浙江宝信新型炉料科技发展有限公司 | Titanium-silicon nitride alloy cored wire |
| CN106399628A (en) * | 2016-11-18 | 2017-02-15 | 浙江宝信新型炉料科技发展有限公司 | Core-spun yarn containing rare earth, niobium, vanadium, boron titanium-silicon nitride alloy powder |
| CN106591537A (en) * | 2016-11-18 | 2017-04-26 | 浙江宝信新型炉料科技发展有限公司 | Rare earth, niobium, vanadium and boron-contained titanium silicon nitride alloy core-spun yarn |
| CN106636543A (en) * | 2016-11-18 | 2017-05-10 | 浙江宝信新型炉料科技发展有限公司 | Core-spun wire high-magnesium-content magnesium rare earth alloy powder |
| CN106636546A (en) * | 2016-11-18 | 2017-05-10 | 浙江宝信新型炉料科技发展有限公司 | Core spun yarn titanium-silicon nitride alloy powder containing rare earth, calcium, barium and molybdenum |
| CN106636545A (en) * | 2016-11-18 | 2017-05-10 | 浙江宝信新型炉料科技发展有限公司 | High-titanium titanium-silicon nitride alloy core spun yarn |
| CN106636553A (en) * | 2016-11-19 | 2017-05-10 | 浙江宝信新型炉料科技发展有限公司 | Solid metallic calcium, silicon iron and multi-element high-magnesium alloy composite cored wire |
| CN106636551A (en) * | 2016-11-19 | 2017-05-10 | 浙江宝信新型炉料科技发展有限公司 | Composite cored wire of solid metal calcium and magnesium-rare earth alloy containing various elements |
| CN106399631A (en) * | 2016-11-19 | 2017-02-15 | 浙江宝信新型炉料科技发展有限公司 | Composite cored wire comprising solid calcium metal and high-magnesium alloy containing multiple elements |
| CN106636552A (en) * | 2016-11-19 | 2017-05-10 | 浙江宝信新型炉料科技发展有限公司 | Composite cored wire composed of solid calcium metal, silicon iron and titanium-silicon nitride alloy containing rare earth, barium and molybdenum |
| CN106676232A (en) * | 2016-11-19 | 2017-05-17 | 浙江宝信新型炉料科技发展有限公司 | Solid calcium metal, ferrosilicon and high-titanium titanium silicon nitride alloy powder composite core-spun yarn |
| CN106702085A (en) * | 2016-11-19 | 2017-05-24 | 浙江宝信新型炉料科技发展有限公司 | Solid calcium metal, ferrosilicon and titanium-silicon nitride alloy powder composite core spun yarn |
| CN106521090A (en) * | 2016-11-19 | 2017-03-22 | 浙江宝信新型炉料科技发展有限公司 | Solid calcium metal, rare earth-barium-molybdenum-containing titanium nitride and silicon alloy composite core-spun yarn |
| CN106399637A (en) * | 2016-11-19 | 2017-02-15 | 浙江宝信新型炉料科技发展有限公司 | Composite cored wire comprising solid calcium metal, silicon iron and magnesium-rare earth alloy containing multiple elements |
| CN106399630A (en) * | 2016-11-19 | 2017-02-15 | 浙江宝信新型炉料科技发展有限公司 | Solid calcium metal, silicon iron and high-magnesium rare earth-magnesium alloy composite cored wire |
| CN107841598A (en) * | 2017-11-01 | 2018-03-27 | 马鞍山瑞辉实业有限公司 | A kind of cast steel deoxygenated alloy and its processing method and its application method |
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