CN103668002B - Novel ferrite heat-resistant cast steel and production method thereof - Google Patents
Novel ferrite heat-resistant cast steel and production method thereof Download PDFInfo
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- CN103668002B CN103668002B CN201310583243.8A CN201310583243A CN103668002B CN 103668002 B CN103668002 B CN 103668002B CN 201310583243 A CN201310583243 A CN 201310583243A CN 103668002 B CN103668002 B CN 103668002B
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Abstract
The invention discloses novel ferrite heat-resistant cast steel which comprises the following elements in percentage by weight (wt%): 0.15-0.55% of C, 0.3-1.5% of Si, 0.5-2.0% of Mn, no more than 0.05% of P, 0.05-0.15% of S, 12-18% of Cr, 0-1.8% of Ni, 0.01-0.1% of N, 0.1-1.0% of Re, 0-2% of Mo, 0-4% of Nb and the balance of Fe. According to the invention, the normal temperature tensile strength of the ferrite heat-resistant cast steel is no less than 500 MPa, the yield strength is no less than 400 MPa, and the extension percentage is no less than 1%; and the high-temperature-resistant temperature of a spare part forming by casting of the material is up to 850 DEG C or above. The ferrite heat-resistant cast steel disclosed by the invention can replace chromium-nickel austenite heat-resistant cast steel, has the characteristics of high performance and low cost, and is suitable for manufacturing of spare parts such as turbine exhaust manifolds, boilers, thermal valve bodies and the like.
Description
Technical field
The invention belongs to field of alloy steel, particularly relate to a kind of novel ferrite heat-resistant cast steel and production method thereof, this Heat resisting cast steel has good high-temperature oxidation resistant, high temperature fatigue resistance and cracking resistance more than 850 DEG C, this material is especially applicable to manufacturing the component such as motor car engine turbine exhaust manifold, boiler, thermal valve body, there is significant high-performance, feature that cost is low, have broad application prospects.
Background technology
In Heat resisting cast steel, resistance toheat mainly contains austenitic heat resistant cast steel and ferrite heat-resistant cast steel preferably: austenitic heat resistant cast steel resistance toheat is better, mainly improve resistance toheat by adding the precious metals such as more chromium, nickel, therefore production cost is higher, and ferrite heat-resistant cast steel add-on in precious metal nickel is less, production cost reduces greatly, but its resistance toheat is poor.And along with the whole world to energy-saving and emission-reduction require day by day harsh, the specification of quality of Heat resistant casting is more and more higher, and production cost is also in increase simultaneously.Therefore, in order to improve product competitiveness and Business Economic Benefit, meet the specification of quality of client to Heat resisting cast steel, in the urgent need to developing a kind of Heat resisting cast steel material of novel high-performance and low-cost simultaneously.
Summary of the invention
Problem to be solved by this invention is to provide a kind of novel ferrite heat-resistant cast steel and production method thereof, the foundry goods poured into a mould by this material has the features such as good high-temperature oxidation resistance, high-temperature hot fatigability and high temperature cracking resistance, has the advantages such as low cost, castibility be good simultaneously.
A kind of novel ferrite heat-resistant cast steel of the present invention, it by following element by weight percentage (wt%) form: C:0.15-0.55%, Si:0.3-1.5%, Mn:0.5-2.0%, P :≤0.05%, S:0.05-0.15%, Cr:12-18%, Ni:0-1.8%, N:0.01-0.1%, Re:0.1-1.0%, Mo:0-2%, Nb:0-4%, Fe surplus.
The production method of ferrite heat-resistant cast steel of the present invention is: (1) prepares burden: by the chemical composition of ferrite heat-resistant cast steel, take the furnace charges such as the steel scrap of required weight, carburelant, ferrochrome, nickel plate, nitrided ferro-chromium, rare earth alloy, molybdenum-iron, ferro-niobium, sulphur iron, ferromanganese, ferrosilicon; (2) melting: before medium-frequency induction furnace black furnace starts, first load the furnace charges such as steel scrap, carburelant, ferrochrome, molybdenum-iron, skimming after molten steel fusing adds nickel plate, ferro-niobium, nitrided ferro-chromium, sulphur iron, rare earth alloy is added when molten steel temperature reaches 1500 DEG C, when being rapidly heated to more than 1600 DEG C, add ferrosilicon before fast stove after metallographic, ferromanganese, silico-calcium carry out deoxidation, tap rapidly when liquid steel temperature reaches 1660 DEG C; (3) tap, pour into a mould: before tapping, casting ladle cylinder-packing will toast thoroughly, adds a little aluminium block and carry out final deoxygenation in casting ladle; Molten steel is skimmed rapidly and pushing off the slag in casting process after rolling; After cast terminates, after casting mold cooling, unpack and namely obtain ferrite heat-resistant cast steel.
Ferrite heat-resistant cast steel of the present invention adopts medium-frequency induction furnace melting to obtain, and is produced obtain by rational melting technology.Ferrite heat-resistant cast steel of the present invention optimizes the chemical composition of conventional ferrite Heat resisting cast steel, add nickel by few chromatize, less or do not add nickelalloy, the element such as nitrogen, rare earth, niobium, molybdenum of trace is adopted to replace, improve the high-temperature behavior of ferrite heat-resistant cast steel, thus obtain a kind of novel ferrite heat-resistant cast steel novel material, its room temperature tensile strength >=500MPa, yield strength >=400MPa, elongation >=1%, the high temperature resistant temperature of the component poured into a mould by this material reaches more than 850 DEG C.Ferrite heat-resistant cast steel of the present invention can substitute chromium austenitic Heat resisting cast steel, has high-performance and low-cost feature, is applicable to making the component such as turbine exhaust manifold, boiler, thermal valve body.
Accompanying drawing explanation
Fig. 1 is the metallographic structure figure of the embodiment of the present invention 1;
Fig. 2 is the metallographic structure figure of the embodiment of the present invention 2;
Fig. 3 is the metallographic structure figure of the embodiment of the present invention 3;
Fig. 4 is the metallographic structure figure of the embodiment of the present invention 4.
Embodiment
Below in conjunction with embodiment, particular content of the present invention is further described in detail.
A kind of novel ferrite heat-resistant cast steel of the present invention, it by following element by weight percentage (wt%) form: C:0.15-0.55%, Si:0.3-1.5%, Mn:0.5-2.0%, P :≤0.05%, S:0.05-0.15%, Cr:12-18%, Ni:0-1.8%, N:0.01-0.1%, Re:0.1-1.0%, Mo:0-2%, Nb:0-4%, surplus is Fe.
The production method of ferrite heat-resistant cast steel of the present invention is: (1) prepares burden: by the chemical composition of ferrite heat-resistant cast steel, take the furnace charges such as the steel scrap of required weight, carburelant, ferrochrome, nickel plate, nitrided ferro-chromium, rare earth alloy, molybdenum-iron, ferro-niobium, sulphur iron, ferromanganese, ferrosilicon, silico-calcium; (2) melting: before medium-frequency induction furnace black furnace starts, first load the furnace charges such as steel scrap, carburelant, ferrochrome, molybdenum-iron, skimming after molten steel fusing adds nickel plate, ferro-niobium, nitrided ferro-chromium, sulphur iron, rare earth alloy is added when molten steel temperature reaches 1500 DEG C, when being rapidly heated to more than 1600 DEG C, add ferrosilicon before fast stove after metallographic, ferromanganese, silico-calcium carry out deoxidation, tap rapidly when liquid steel temperature reaches 1660 DEG C; (3) tap, pour into a mould: before tapping, casting ladle cylinder-packing will toast thoroughly, adds a little aluminium block and carry out final deoxygenation in casting ladle; Molten steel is skimmed rapidly and pushing off the slag in casting process after rolling; After cast terminates, after casting mold cooling, unpack and namely obtain ferrite heat-resistant cast steel.
Wherein, silico-calcium, ferrosilicon, ferromanganese and aluminium are reductor, wherein the composition of silicocalcium: silicon 60-75%, calcium 2-4%, barium 3-6%, and aluminium is less than 1%, Yu Weitie; Ferrosilicon alloy components: silicon 71-75%, calcium 0.8-1.5%, aluminium 0.7-1.2%, Yu Weitie; Manganeseirom composition: manganese 72-78%, carbon 1.5-2.5%, Yu Weitie, or ferromanganese is manganese metal, Fe content > 99%; Aluminium is fine aluminium.
Rare earth alloy is common rare earth ferrosilicon, composition: rare earth 15-30%, calcium 1-4%, barium 2-5%, silicon 30-60%, and surplus is iron.
Steel scrap selects common waste steel plate, wherein: O.01%, S < O.01% for C:0.8-0.15%, Si:0.15-0.25%, Mn:0.2-0.6%, P <.
Embodiment 1: in medium-frequency induction furnace melting, (1) prepare burden: by the chemical composition of novel ferrite heat-resistant cast steel, take the furnace charges such as 68.14% steel scrap of required weight, carburelant 0.06%, 27.9% ferrochrome, 0.2% nickel plate, 0.3% nitrided ferro-chromium, 0.9% rare earth alloy, 0.9% molybdenum-iron, 0.3% ferro-niobium, 0.4% sulphur iron, 0.6% ferrosilicon, 0.3% ferromanganese.(2) melting: before medium-frequency induction furnace black furnace starts, first load the furnace charges such as steel scrap, carburelant, ferrochrome, molybdenum-iron, skimming after molten steel fusing adds nickel plate, ferro-niobium, nitrided ferro-chromium, sulphur iron, rare earth alloy is added when molten steel temperature reaches 1500 DEG C, when being rapidly heated to more than 1600 DEG C, add ferrosilicon before fast stove after metallographic, ferromanganese, silico-calcium carry out deoxidation, tap rapidly when liquid steel temperature reaches 1660 DEG C.(3) tap, pour into a mould: before tapping, casting ladle cylinder-packing will toast and cut, and adds a little aluminium block and carry out final deoxygenation in casting ladle.Molten steel is skimmed rapidly and pushing off the slag in casting process after rolling.After cast terminates, after casting mold cooling, namely unpack obtains to obtain novel ferrite heat-resistant cast steel, and its chemical composition, mechanical property, metallographic structure are respectively in table 1, table 2, Fig. 1.
Embodiment 2: in medium-frequency induction furnace melting, (1) prepare burden: by the chemical composition of novel ferrite heat-resistant cast steel, take 66.82% steel scrap of required weight, carburelant 0.18%, 29.6% ferrochrome, 0.5% nickel plate, 0.3% nitrided ferro-chromium, 0.64% rare earth alloy, 0.4% molybdenum-iron, the furnace charges such as 0.26% ferro-niobium, 0.4% sulphur iron, 0.6% ferrosilicon, 0.3% ferromanganese.(2) melting: before medium-frequency induction furnace black furnace starts, first load the furnace charges such as steel scrap, carburelant, ferrochrome, molybdenum-iron, skimming after molten steel fusing adds nickel plate, ferro-niobium, nitrided ferro-chromium, sulphur iron, rare earth alloy is added when molten steel temperature reaches 1500 DEG C, when being rapidly heated to more than 1600 DEG C, add ferrosilicon before fast stove after metallographic, ferromanganese, silico-calcium carry out deoxidation, tap rapidly when liquid steel temperature reaches 1660 DEG C.(3) tap, pour into a mould: before tapping, casting ladle cylinder-packing will toast and cut, and adds a little aluminium block and carry out final deoxygenation in casting ladle.Molten steel is skimmed rapidly and pushing off the slag in casting process after rolling.After cast terminates, after casting mold cooling, namely unpack obtains to obtain novel ferrite heat-resistant cast steel, and its chemical composition, mechanical property, metallographic structure are respectively in table 1, table 2, Fig. 2.
Embodiment 3: in medium-frequency induction furnace melting, (1) prepare burden: by the chemical composition of novel ferrite heat-resistant cast steel, take the furnace charges such as 64.12% steel scrap of required weight, carburelant 0.08%, 31.1% ferrochrome, 1.9% nickel plate, 0.3% nitrided ferro-chromium, 0.64% rare earth alloy, 0.3% molybdenum-iron, 0.26% ferro-niobium, 0.4% sulphur iron, 0.6% ferrosilicon, 0.3% ferromanganese.(2) melting: before medium-frequency induction furnace black furnace starts, first load the furnace charges such as steel scrap, carburelant, ferrochrome, molybdenum-iron, skimming after molten steel fusing adds nickel plate, ferro-niobium, nitrided ferro-chromium, sulphur iron, rare earth alloy is added when molten steel temperature reaches 1500 DEG C, when being rapidly heated to more than 1600 DEG C, add ferrosilicon before fast stove after metallographic, ferromanganese, silico-calcium carry out deoxidation, tap rapidly when liquid steel temperature reaches 1660 DEG C.(3) tap, pour into a mould: before tapping, casting ladle cylinder-packing will toast and cut, and adds a little aluminium block and carry out final deoxygenation in casting ladle.Molten steel is skimmed rapidly and pushing off the slag in casting process after rolling.After cast terminates, after casting mold cooling, namely unpack obtains to obtain novel ferrite heat-resistant cast steel, and its chemical composition, mechanical property, metallographic structure are respectively in table 1, table 2, Fig. 3.
Embodiment 4: in medium-frequency induction furnace melting, (1) prepare burden: by the chemical composition of novel ferrite heat-resistant cast steel, take the furnace charges such as 62.23% steel scrap of required weight, carburelant 0.42%, 33.6% ferrochrome, 1.1% nickel plate, 0.3% nitrided ferro-chromium, 0.64% rare earth alloy, 0.15% molybdenum-iron, 0.26% ferro-niobium, 0.4% sulphur iron, 0.6% ferrosilicon, 0.3% ferromanganese.(2) melting: before medium-frequency induction furnace black furnace starts, first load the furnace charges such as steel scrap, carburelant, ferrochrome, molybdenum-iron, skimming after molten steel fusing adds nickel plate, ferro-niobium, nitrided ferro-chromium, sulphur iron, rare earth alloy is added when molten steel temperature reaches 1500 DEG C, when being rapidly heated to more than 1600 DEG C, add ferrosilicon before fast stove after metallographic, ferromanganese, silico-calcium carry out deoxidation, tap rapidly when liquid steel temperature reaches 1660 DEG C.(3) tap, pour into a mould: before tapping, casting ladle cylinder-packing will toast and cut, and adds a little aluminium block and carry out final deoxygenation in casting ladle.Molten steel is skimmed rapidly and pushing off the slag in casting process after rolling.After cast terminates, after casting mold cooling, namely unpack obtains to obtain novel ferrite heat-resistant cast steel, and its chemical composition, mechanical property, metallographic structure are respectively in table 1, table 2, Fig. 4.
In ferrite heat-resistant cast steel of the present invention, rare earth used is rare earth ferrosilicon alloy, wherein cerium/lanthanum >=4, the content > 20% of cerium, this rare earth ferrosilicon is simultaneously containing a small amount of calcium, barium element, share with rare earth, there is following effect: rare earth can cleaning molten steel, oxygen level in molten steel is reduced greatly, improve the structure of oxide skin simultaneously, make oxide skin become fine and close, in the environment for use of cold cycling, oxide skin difficult drop-off, thus the high temperature fatigue resistance and the high-temperature oxidation resistance that substantially increase steel; Niobium is added in molten steel, can form stable Niobium carbide, crystal grain thinning, greatly increase hot strength; Molybdenum is added in molten steel, energy crystal grain thinning, reduces carbide and forms continuous net-shaped tendency at crystal boundary, reduce low temperature brittleness; Nitrogen is added in molten steel, though be strong austenizer, a small amount of nitrogen energy crystal grain thinning, improves hot strength, reduce hot-short tendency; The combination of rare earth, niobium, molybdenum, nitrogen effectively can play the effect of each element, cleaning molten steel, crystal grain thinning, raising high temperature scale resistance, hot strength, cool-hot fatigue and reduction fragility.Ferrite heat-resistant cast steel of the present invention can use down in hot environment more than 850 DEG C, there is good high-temperature oxidation resistance, high temperature anti-fatigue performance and cracking resistance energy, can substitute chromium austenitic Heat resisting cast steel, there is high-performance and low-cost feature, be applicable to manufacturing the component such as turbine exhaust manifold, boiler, thermal valve body.
The chemical composition of the novel ferrite heat-resistant cast steel of table 1
The mechanical property of the novel ferrite heat-resistant cast steel of table 2
Claims (4)
1. the production method of a ferrite heat-resistant cast steel is:
(1) prepare burden: the chemical composition by ferrite heat-resistant cast steel: C:0.15-0.55%, Si:0.3-1.5%, Mn:0.5-2.0%, P :≤0.05%, S:0.05-0.15%, Cr:12-18%, Ni:0-1.8%, N:0.01-0.1%, Re:0.1-1.0%, Mo:0-2%, Nb:0-4%, surplus is the above-mentioned wt% that is weight percentage of Fe(); Take the steel scrap of required weight, carburelant, ferrochrome, nickel plate, nitrided ferro-chromium, rare earth alloy, molybdenum-iron, ferro-niobium, sulphur iron, ferromanganese, ferrosilicon furnace charge;
(2) melting: before medium-frequency induction furnace black furnace starts, first load steel scrap, carburelant, ferrochrome, molybdenum-iron furnace charge, skim after molten steel fusing and add nickel plate, ferro-niobium, nitrided ferro-chromium, sulphur iron, rare earth alloy is added when molten steel temperature reaches 1500 DEG C, when being rapidly heated to more than 1600 DEG C, add ferrosilicon before fast stove after metallographic, ferromanganese, silico-calcium carry out deoxidation, tap rapidly when liquid steel temperature reaches 1660 DEG C;
(3) tap, pour into a mould: before tapping, casting ladle cylinder-packing will toast thoroughly, adds a little aluminium block and carry out final deoxygenation in casting ladle; Molten steel is skimmed rapidly and pushing off the slag in casting process after rolling; After cast terminates, after casting mold cooling, unpack and namely obtain ferrite heat-resistant cast steel.
2. production method according to claim 1, is characterized in that: described silico-calcium, ferrosilicon, ferromanganese and aluminium are reductor, wherein the composition of silicocalcium: silicon 60-75%, calcium 2-4%, barium 3-6%, and aluminium is less than 1%, Yu Weitie; Ferrosilicon alloy components: silicon 71-75%, calcium 0.8-1.5%, aluminium 0.7-1.2%, Yu Weitie; Manganeseirom composition: manganese 72-78%, carbon 1.5-2.5%, Yu Weitie, or ferromanganese is manganese metal, Fe content > 99%; Aluminium is fine aluminium.
3. production method according to claim 1, is characterized in that: described rare earth alloy is common rare earth ferrosilicon, composition: rare earth 15-30%, calcium 1-4%, barium 2-5%, silicon 30-60%, and surplus is iron.
4. production method according to claim 1, is characterized in that: described steel scrap selects common waste steel plate, wherein: C:0.8-0.15%, Si:0.15-0.25%, Mn:0.2-0.6%, P < 0.01%, S < 0.01%.
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| CN106011624A (en) * | 2016-06-30 | 2016-10-12 | 芜湖地心引力运动科技有限公司 | High-hardness highly-wear-resistant metal material used for sports equipment and preparation method thereof |
| CN115896611B (en) * | 2022-10-28 | 2024-01-12 | 鞍钢集团矿业有限公司 | Austenite-ferrite dual-phase heat-resistant steel and preparation method and application thereof |
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| JPS63171856A (en) * | 1987-01-09 | 1988-07-15 | Hitachi Ltd | Heat-resisting steel and gas turbine using same |
| CA1320110C (en) * | 1988-06-13 | 1993-07-13 | Hiroshi Tamehiro | Process for manufacturing building construction steel having excellent fire resistance and low yield ratio, and construction steel material |
| JPH08218154A (en) * | 1995-02-14 | 1996-08-27 | Nippon Steel Corp | High strength ferritic heat resistant steel excellent in intermetallic compound precipitating embrittlement resistance |
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| JP4995122B2 (en) * | 2007-03-02 | 2012-08-08 | 新日本製鐵株式会社 | Ferritic heat-resistant steel and heat-resistant structure with excellent creep characteristics in weld heat-affected zone |
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