CN1202532A - As-cast wear resisting steel for thermal power plant and its producing method - Google Patents
As-cast wear resisting steel for thermal power plant and its producing method Download PDFInfo
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- CN1202532A CN1202532A CN 98100966 CN98100966A CN1202532A CN 1202532 A CN1202532 A CN 1202532A CN 98100966 CN98100966 CN 98100966 CN 98100966 A CN98100966 A CN 98100966A CN 1202532 A CN1202532 A CN 1202532A
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Abstract
The chemical components in percentage of the as-cast wear resisting steel include: C 0.30-0.45,Si 1.5-2.5, Mn 1.5-2.5, Cr 1.0-2.0, Mo 0.3-0.8, Ni 0.3-1.0, P less than 0.04, S less than 0.04, Mg 0.001-0.007, Ca 0.001-0.006, Re 0.01-0.06, Zr 0.01-0.05, Nb 0.01-0.1 and Ta 0.001-0.005 other than Fe. The steel has good wear resistance, corrosion resistance and weldability as well as simple, practical and low-cost production process.
Description
The present invention relates to the chrome-moly steel technical field, specifically is pipelines such as a kind of thermal power plant pulverized coal conveying and ash disposal cast wear-resistant steel and manufacture method thereof.
The fuel-burning power plant is in the powder process ash disposal system, a large amount of pulverized coal conveying, coal ash straight tube, bend pipe, tee pipe fitting consumable accessorys such as (hereinafter to be referred as pipelines) of using, be in coal dust for a long time, coal ash washes away and wastes damage, the performance of pipeline directly influences the safety and economic operation of thermal power plant.At present, the common A3 steel of domestic common use is made straight tube, bend pipe, because its hardness is low, wears no resistance, and the leakage powder that often is worn through in the use does not reach an overhaul phase requirement work-ing life, influences the power station safety and economic operation.In order to improve the work-ing life of pipeline the domestic research of carrying out the casting pipeline material." metal heat treatmet " 1996 the 8th phases 18 pages of " cooling of heavy caliber low alloy steel abrasion-proof bent tube nebelwind " civilian disclosed C 0.35-0.5%, Si 0.4-0.7%, Mo 0.15-0.30%, Cr 1.0-1.6%, Mn0.7-1.4%, wear resisting steel, because contained Si, Mn, Mo content is low, and no as cast condition self-hardening ability must adopt traditional reheating to carry out complicated quenching-tempering heat treatment, and need nebelwind to force cooling, just can make pipe fitting obtain higher hardness HRC48-55, but under the high rigidity condition, welding process is installed at the scene, be prone to cold crack, this also is its weak point.
In recent years, also adopt the low-alloy wear-resistant steel manufacturing to fail pulverized coal channel abroad, for example U.S.'s AISI4340H steel, its chemical constitution (%): C 0.37-0.45, Si 0.20-0.35, Mn 0.60-0.90, Cr 0.65-0.90, Cr 0.65-0.95, Mo 0.20-0.30, Ni 1.50-2.00, Cu＜0.35, P＜0.04, S＜0.04, its weak point one is the ni content height, and production cost is too high, the 2nd, and this steel need adopt to reheat equally and quench, tempering heat treatment, just can make steel have high rigidity, improve wear resistance, but under the high rigidity condition (HRC＞50), welding property degenerates, at the scene in the installation process, easily produce welding crack, and when the pipe fitting caliber bigger, when length is longer, the large-scale thermal treatment electric furnace of still needing, cause many factories to heat-treat, will consume a large amount of energy simultaneously, the production cost height it.
The purpose of this invention is to provide a kind of power station and carry pipe fitting with cast wear-resistant steel and manufacture method thereof, this steel not only has higher hardness, wear resistance, solidity to corrosion and certain toughness, but and has that as-cast property, welding property as cast condition are used preferably.Method is simple to make this kind steel, saved the equipment and the energy, and production cost is lower.
One of the object of the invention is achieved in that a kind of fuel-burning power plant conveying pipe fitting cast wear-resistant steel, it is characterized in that having following chemical compositions by percentage: C 0.30-0.45, Si 1.5-2.5, Mn 1.5-2.5, Cr 1.00-2.00, Mo 0.3-0.8, Ni 0.3-1.00, P＜0.04, S＜0.04, Mg0.001-0.006, Ca 0.001-0.006, RE 0.01-0.06, Zr 0.01-0.05, Nb 0.01-0.1, Ta 0.001-0.005.
Its optimum chemical composition percentage composition: C 0.35-0.42, Si 1.6-2.0, Mn 1.6-2.2, Cr 1.0-1.50, Mo 0.4-0.6, Ni 0.4-0.6, Mg 0.002-0.004, Ca 0.002-0.004, RE 0.02-0.04, Zr 0.02-0.04, Nb 0.03-0.06, P＜0.04, S＜0.04, surplus is Fe.
Now the chemical composition design foundation of cast wear-resistant steel of the present invention and the reason of qualification content range are summarized as follows:
(1) carbon amount: be the most most important element in wear resisting steel, its content what directly determine hardness, wear resistance, toughness, the weldability of foundry goods.Improve carbon content, can improve hardness, wear resistance, but the toughness weldability reduces.For guaranteeing that wear resistance castings has higher hardness, wear resistance, toughness, and processing performances such as better founding, welding, the selected carbon content of steel of the present invention is to be suitable in the 0.30-0.45% scope.
(2) manganese amount: it enlarges austenite region strongly, suppress perlitic transformation, can obviously improve hardening capacity, the sharp sulphur of manganese energy, purify hot metal, it is again more cheap element, can add higher manganese amount,, but too much will impel crystal grain thick with raising hardness, wear resistance, so the weldability variation is selected 1.5-2.5%.
(3) silicon amount: silicon can solution strengthening improve hardness, intensity, silicon also can make the perlitic transformation C curve move to right, improve the hardening capacity of steel, silicon impels steel to form bainite structure in continuous cooling process, make steel have good obdurability, steel of the present invention utilizes the above-mentioned effect of silicon, add more silicon amount, silicon can improve anti-temper resistance, prevent that the pulverized coal conveying pipeline from softening (use temperature is about 250 ℃), reduce wear resistance, but excess silicon can impel steel to produce column crystal, the serious toughness that reduces, taking all factors into consideration selected silicon amount is 1.5-2.5%.
(4) chromium, nickel, molybdenum: chromium, nickel, molybdenum element all can improve the hardening capacity of steel, element cooperates and adds the hardening capacity that then can increase substantially steel, adopt the unpack method of air cooling of heat, can make steel obtain bainite-martensite duplex structure and have good comprehensive mechanical property, but Cr, Ni, Mo equal size are too much, can increase the cast steel cost, and Cr, Mo form too much carbide and reduce toughness, and welding property is so choose Cr 1.0-2.0%, Mo 0.3-0.8%, Ni 0.3-1.0%.
Steel of the present invention does not add boron, only add minor amount of nickel element and polynary trace alloying element, except that the hardening capacity that increases substantially steel, also improve the welding property of steel, obtain bainite-martensite duplex structure, have good comprehensive mechanical properties and processing performance, this is one of steel of the present invention and prior art important difference.Though the cast steel of above-mentioned chemical ingredients can harden under the unpacking air cooling condition of as cast condition heat, but owing to no longer reheat quenching-drawing process, crystal grain is thick, toughness is low, so the present invention adds more trace elements, make the refinement densification of the unpacking air cooling condition undertissue of foundry goods heat, toughness increases substantially, and guarantees that pipe fitting is safe and reliable.
Steel of the present invention adds following trace element, and its effect machine amount is discussed below:
Zirconium, niobium, tantalum: all are strong crystal grain thinning elements, Xiang Gangzhong adds trace zirconium, niobium, tantalum, energy is crystal grain thinning significantly, improve the toughness of steel, welding property, this is to guarantee one of measure that steel as cast condition of the present invention is used, through repetition test, its suitable add-on zirconium is 0.01-0.05%, and Nb 0.01-0.1%, tantalum are 0.001-0.005%.
Rare earth, magnesium, calcium: but rare earth RE purify hot metal, and crystal grain thinning improves inclusion morphology and distribution, improve toughness, it is strong reductor that steel of the present invention adds micro-Ca, but purify hot metal, and play the microalloying effect, thinning microstructure improves the steel plasticity and toughness, further improves the welding property of steel, can prevent the generation of welding cold cracking, add micro-Ca, fully deoxidation, desulfurization, degas, purify brilliant Jie Ca and S, O and be easy to chemical combination and form CaS and CaO, reduce S, O deleterious effect.Magnesium is vaporized under the condition of high temperature, impels the molten steel boiling, plays and degass, stir the effect of purify hot metal, but crystal grain thinning, eliminate the fragility and the decrepitation of the steel that non-metallic inclusion causes, improve the moulding of steel, toughness, welding property, but these three element add-ons can not be too much, otherwise easily produce oxide inclusion, the performance of infringement steel, suitable add-on is: RE 0.01-0.06%, Ca 0.001-0.006, Mg 0.001-0.006%.
Sulphur, phosphorus: in steel of the present invention, be considered as detrimental impurity, should reduce its content as far as possible, should be controlled at P≤0.030, S≤0.030%.
The present invention also provides the following manufacture method of above-mentioned steel: it is characterized in that in the Fe-C alloy, add Si, Mn, Cr, Ni, the Mo alloying element, add more trace elements Nb again, Ta, Zr, Mg, Ca, RE, by requirement chemical ingredients batching, fusing (the melting scaling loss is taken into account) in electric furnace, be warming up to 1560-1580 ℃, add aluminium deoxidation, with the low magnesium alloy FeSiMg2RE27 of high rare earth, SiCa alloy and packet header 1# rare-earth silicon alloy add the ladle bottom, dashing the molten stokehold ternary composite inoculating that carries out with molten steel handles, make Mg, Ca, RE etc. reach desired chemical ingredients, with pouring molten steel in the sand mold die cavity, after solidifying, when foundry goods was cooled to 900 ℃-950 ℃ in die cavity, heat was unpacked, and foundry goods is placed in the air cooled off, when being chilled to 300 ℃-350 ℃, immediately foundry goods being put into and buried sand in the sandpit and be cooled to room temperature and get final product.
Because steel castability of the present invention is excellent, straight tube, the bend pipe of the wall thickness 8-30 millimeter all size of can casting.Foundry goods solidifies in type when being as cold as to 900-950 ℃, and heat unpack to be taken out foundry goods, cools off in air, when foundry goods is cooled to 300-350 ℃, foundry goods is imbedded that slow cooling to room temperature gets final product in the sandpit again, can reach HRC45-50, a from its hardness of pipe fitting body sampling
k〉=20J/cm
2Used proof in 6 power station, its wear resistance be the A3 steel 4-5 doubly, can guarantee that 2 overhaul phases (6 years) do not change, produced 1000 with aforesaid method surplus ton all size pipe fitting and other wearing piece, obtain better economic benefit and social benefit.
Steel of the present invention is compared with steel with other wearing pieces such as existing thermal power plant pulverized coal conveying, coal ash pipe fitting, little liner plates, has following advantage:
1, the present invention adopts main added elements silicon, manganese, resource to base on our country, and is cheap, adds a small amount of chrome molybdenum, nickel, is equipped with multicomponent microalloying and composite inoculating processing such as Nb, Ta, Zr, Mg, Ca, RE again, can obtain the compact structure structure.
2, make full use of afterheat in casting and heat-treat, promptly adopt controlled cooling.
Heat is unpacked when being chilled to 900 ℃-950 ℃ in the foundry goods type, is cooled to 300 ℃-350 ℃ in air, places sandpit to bury husky slow cooling to room temperature part, can obtain the bainite-martensite duplex structure of excellent combination property.
This steel grade adopts heat to unpack, utilize the cast casting waste heat to heat-treat, production technique is simple, can save the complicated traditional thermal treatments such as quenching-tempering that reheat to high temperature (900-950 ℃), save energy and thermal treatment electric furnace, equipment such as frock, production cost reduces, and higher economy is arranged.
3, this steel comprehensive mechanical property is excellent, from foundry goods (pipe, bend pipe, liner plate etc.) body sampling, its Rockwell hardness HRC45-50, impelling strength a
k〉=20J/cm
2, have high wear resistance, compare with the pipe fitting that the A3 steel is made, improve 3-4 work-ing life doubly, can reach 2 overhaul phases (6 years) work-ing life not change, guarantee power station safety economy generating.
Further specify the performance and the result of use of cast steel of the present invention below in conjunction with embodiment.
Each embodiment chemical ingredients such as following table.
Embodiment 1: chemical ingredients scope designed according to this invention is prepared burden, and melting in electric furnace treats that liquid steel temperature reaches 1560 ℃-1580 ℃.
Each embodiment chemical ingredients such as following table:
Use the aluminium final deoxygenation, with the low magnesium alloy FeSiMg2RE27 of high rare earth, SiCa31 alloy, packet header 1# rare earth alloy adds the ladle bottom, and tapping is dashed the molten stokehold composite inoculating that carries out and handled cast pulverized coal conveying pipe and elbow, type internal cooling to 900 is unpacked by ℃-950 ℃, place air to cool off on foundry goods, when being chilled to 300 ℃-350 ℃, placing sandpit to bury sand part and be cooled to room temperature, take out foundry goods and clear up, as cast condition is used.It is as follows to test every performance: A, test chemical ingredients (%) (seeing Table).
B, from body body sampling ergometry performance:
HRC45.5，a
k?32J/cm
2。
C, result of use
Pipe fitting, elbow with producing are installed on the A power plant convey coal pipe with welding process, use 3 years, and wearing and tearing are little on inspection, still can use 3 years, improved 3 times work-ing life than former with the welded tube of A3 steel.
Embodiment 2: manufacture method is with embodiment 1.
A, record chemical ingredients (%) (seeing Table).
B, mechanical property
Record HRC49.5 from the foundry goods body sampling, a
k23.5J/cm
2
C, result of use
Institute is produced a collection of bend pipe be installed in B power plant ash disposal system, used more than 3 years, still using so far, be contained on the ball mill in-out end inside pipe wall with 100 blocks of little liner plates of stove production, also use more than 3 years, all improve more than 4 times remarkable in economical benefits work-ing life with ordinary steel than former.
Embodiment 3: production method is with embodiment 1, and it is as follows to detect every data:
A, chemical ingredients test result (%) (seeing Table).
B, mechanical property
From foundry goods body sampling ergometry performance
HRC47.5，a
k?29J/cm
2。
C, result of use
Defeated 8 of the coal pipes of the electricity generation boiler fuel nozzle of producing are loaded on C power plant have used more than 3 years, the wearing and tearing base is little on inspection, gives meter and can use 2 overhaul phases, produces the rare earth wear resisting steel than former usefulness factory and improves more than 1 times work-ing life.
Show by installing and using, steel of the present invention adopts multicomponent microalloying and composite inoculating technology, and as cast condition is used, and improves 3-4 doubly work-ing life than power plant is former with the A3 steel-welding fittings, the rare earth wear resisting steel of producing than certain factory improves more than 1 times, has high economic benefit and social benefit.
Embodiment 4: production method is with embodiment 1, and it is as follows to detect every data:
A, chemical ingredients test result (%) (seeing Table).
B, mechanical property
From foundry goods body sampling ergometry performance
HRC48.5，a
k?29J/cm
2。
C, result of use
A collection of Raymond bowl mill protection swash plate substitutes import protection swash plate to this stove product for certain power plant produces, and uses 1 year, think suitable with import protection swash plate wear resistance after testing, but price is 1/4th of an import plate, and economic benefit is very obvious.
Embodiment 5,6,7, also reached the object of the invention (data slightly).
Claims (3)
1, a kind of as-cast wear resisting steel for thermal power plant is characterized in that having following chemical compositions by percentage: C 0.30-0.45, Si 1.5-2.5, Mn 1.5-2.5, Cr 1.00-2.00, Mo 0.3-0.8, Ni 0.3-1.00, P≤0.04, S≤0.04, Mg 0.001-0.006, Ca0.001-0.006, RE 0.01-0.06, Zr 0.01-0.05, Nb 0.01-0.1, Ta 0.001-0.005, surplus is Fe.
2, cast wear-resistant steel according to claim 1 is characterized in that it being the optimum chemical composition percentage composition: C 0.35-0.42, Si 1.6-2.0, Mn 1.6-2.2, Cr 1.00-1.50, Mo 0.4-0.6, Ni 0.4-0.6, Mg 0.002-0.004, Ca 0.002-0.004, RE0.02-0.04, Zr 0.02-0.04, Nb 0.03-0.06, P＜0.04, S＜0.04.
3, the manufacture method of cast wear-resistant steel according to claim 1 and 2, it is characterized in that C, Si, Mn, Cr, Ni, Mo, Nb, Ta, Zr etc. are by desired chemical ingredients batching, in electric furnace, melt, be warming up to 1520-1560 ℃, add the aluminium final deoxygenation, with the low magnesium alloy FeSiMg2RE27 of high rare earth, the SiCa31 alloy, packet header 1# rare earth alloy adds the ladle bottom, and tapping is dashed the molten stokehold composite inoculating that carries out and handled foundry goods type internal cooling, unpack to 900 ℃-950 ℃, take out foundry goods and place air to cool off, when being chilled to 300 ℃-350 ℃, placing sandpit to bury sand on foundry goods and be cooled to room temperature and form.
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| Application Number | Priority Date | Filing Date | Title |
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| CN98100966A CN1058060C (en) | 1998-03-27 | 1998-03-27 | As-cast wear resisting steel for thermal power plant and its producing method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN98100966A CN1058060C (en) | 1998-03-27 | 1998-03-27 | As-cast wear resisting steel for thermal power plant and its producing method |
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| Publication Number | Publication Date |
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| CN1202532A true CN1202532A (en) | 1998-12-23 |
| CN1058060C CN1058060C (en) | 2000-11-01 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102230140A (en) * | 2010-04-28 | 2011-11-02 | 鞍钢集团矿业公司 | Novel martensitic wear resistant steel and production technology for steel casting thereof |
| CN102534398A (en) * | 2012-01-06 | 2012-07-04 | 北京工业大学 | Ferroboron-containing alloy wear-resistant material and preparation method thereof |
| CN108165896A (en) * | 2017-12-29 | 2018-06-15 | 天津威尔朗科技有限公司 | A kind of wear-resisting lining board of grinder of high-silicon alloy steel and its production technology |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1053228C (en) * | 1995-10-20 | 2000-06-07 | 化学工业部湘东化工机械厂 | Low alloyed wear-resistant cast steel pipes and its casting process |
-
1998
- 1998-03-27 CN CN98100966A patent/CN1058060C/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102230140A (en) * | 2010-04-28 | 2011-11-02 | 鞍钢集团矿业公司 | Novel martensitic wear resistant steel and production technology for steel casting thereof |
| CN102230140B (en) * | 2010-04-28 | 2012-11-28 | 鞍钢集团矿业公司 | Martensitic wear resistant steel production technology |
| CN102534398A (en) * | 2012-01-06 | 2012-07-04 | 北京工业大学 | Ferroboron-containing alloy wear-resistant material and preparation method thereof |
| CN102534398B (en) * | 2012-01-06 | 2013-07-31 | 北京工业大学 | Ferroboron-containing alloy wear-resistant material and preparation method thereof |
| CN108165896A (en) * | 2017-12-29 | 2018-06-15 | 天津威尔朗科技有限公司 | A kind of wear-resisting lining board of grinder of high-silicon alloy steel and its production technology |
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| Publication number | Publication date |
|---|---|
| CN1058060C (en) | 2000-11-01 |
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