CN102703820A - Heat resistant steel for sintering machine grates - Google Patents
Heat resistant steel for sintering machine grates Download PDFInfo
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- CN102703820A CN102703820A CN201210020351XA CN201210020351A CN102703820A CN 102703820 A CN102703820 A CN 102703820A CN 201210020351X A CN201210020351X A CN 201210020351XA CN 201210020351 A CN201210020351 A CN 201210020351A CN 102703820 A CN102703820 A CN 102703820A
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Abstract
The invention discloses heat resistant steel for sintering machine grates. The heat resistant steel comprises chemical components, by weight percent, including 0.08-0.12% of C, 0.6-0.8% of Si, 1.2-1.4% of Mn, 12.0-14.0% of Cr, 1.3-1.5% of Mo, 0.5-0.7% of W, 1.5-1.7% of Co, 0.10-0.12% of V, 0.05-0.07% of B, 0.2-0.4% of Nb, 0.08-0.10% of Ti, not less than 0.03% of S, not less than 0.05% of P, the balance of iron, and unavoidable impurities.
Description
Technical field
The present invention relates to the ferrous materials manufacture field, particularly a kind of sinter machine grid is used high temperature steel.
Background technology
Sinter machine is the key equipment of ferrous metallurgy, and grid section is the crucial consumable accessory of sinter machine.Its working temperature changes at 100～1000 ℃ of scope intercycles; Bear the action of gravity of sintering mineral aggregate in the high-temperature sintering process, the high speed impact abrasion of two air-flows of powder gas, and the oxidation corrosion of carbon monoxide, carbonic acid gas, sulfurous gas and water vapour etc. in the atmosphere; Bear the mechanical wear of agglomerate in the discharge process; Also have the mechanical vibration in the operational process, the physical shock of scale removal process etc. in addition.The comprehensive action result of high temperature oxidation, burn into wearing and tearing, impact, thermal fatigue makes that sinter machine grid occurs bending and deformation, the gap increases; Even phenomenon such as fracture, cause Lou that material and sintering operating mode change, both aggravating working environment; Reduce sintering quality again, must keep in repair, change.If shutdown maintenance then influences ordinary production, reduces plant factor and output, if then workman's labor condition, security are relatively poor for on-line replacing.Be one of smelter key technical problem that need solve the work-ing life of therefore, improving grid section always.
High temperature steel is one of the main raw of component of working under the hot conditions, can be divided into austenitic heat-resistance steel, jessop and two-phase high temperature steel by the matrix of high temperature steel.Wherein jessop does not contain because of it or contains expensive nickel element less, and is with low cost, and thermal expansivity is less, non-deformability comes into one's own by force and more and more.But it is prone to form the Cr that distributes along crystal boundary
23C
6The type carbide, and along with the raising of Cr and C content forms the tendency increase.It not only significantly reduces room temperature impelling strength, and because Cr
23C
6High high-temp stability relatively poor, hot strength is lower.
External sinter machine grid once mainly adopted high chromium nickel heat-resisting steel, like Cr20Ni14, Cr25Ni20 etc.Usually adopt methods such as alloying elements such as reducing carbon content, interpolation W, Mo, Co, Ti, V, Nb, N, B, Zr, Ni, RE and heat treatment precipitation reinforcement for the performance of improving jessop.Like USP 7,211,159 disclose a kind of jessop: C≤0.01%; Cr 1.0～13%, and Co 0.1～8.0%, and N 0.01～0.20%; Ni≤3.0%; (V, Nb, Ta, Ti, Hf, Zr) 0.01to 0.50% through 1000～1300 ℃ of solution treatment and 500～850 ℃ of ageing treatment, obtains MX type precipitation strength phase.USP 6,162,307 disclose a kind of jessop: C 0.02～0.15%, and Si 0～1.0%, and Cr 1.0～13%; Mn 0.05～1.5%, and Ni 0～1.5%, and Cr 8.0～13.0%, and W 1.5～4.0%, and Mo 0～1.0%; Co 2.0～8.0%, and V 0.10～0.50%, and Ta 0.01～0.50%, and Nb 0～0.15%, and Nd 0.001～0.24%; Ca 0～0.010, and Mg 0～0.010%, and N 0.020～0.12%, and B 0.～0.030%, and Al 0.001～0.050%.
And China is poor because of nickel resources, costs an arm and a leg then seldom to adopt.The used material of domestic sinter machine grid mainly contains following several types:
(1) plain cast iron: cost is low, and over-all properties is poor, seldom uses at present.(2) heat resisting iron: fragility is big, oxidation-resistance is relatively poor, and work-ing life is short, uses seldom at present.(3) rich chromium cast iron: high-temperature oxidation resistance is good, and hardness is high, wear resistance is good, and thermal expansivity is little, resistance type ability is strong, but its toughness is relatively poor.The High-Chromium Cast-Iron Grate Bars of nickeliferous, the aluminium of so sharp army development, its composition is C 2.1～3.15%, Cr 20～24%, Al 0.016～1.12%, Si 1.16～2.10%, Mn 0.14～0.16%, Ni 0.16～1.12%; Chromium, aluminium, silicon, the nickel of development such as symbol pallid light etc. is multi-element alloyed and through boron, the rotten High-Chromium Cast-Iron Grate Bars of zirconium, and its composition is C 1.8～2.8%, Cr 22～28%, Al 3～7%, Si 1.0～2.5%, Mn 0.5～1.0%, Ni 0.3～1.2%, B 0.005～0.04%, Zr 0.04～0.10%, Y 0.08～0.25%; Nickeliferous, the molybdenum of Wang Lixin etc. development, the High-Chromium Cast-Iron Grate Bars of vanadium, its composition is C 1.0～1.2%, Cr 20～25%, Al 3～7%, Si 0.6～1.0%, Mn 0.8～5.0%, Ni 0.2～0.8%, Mo 0.6～1.2%, V 0.1～0.5%, RE 0.01～0.03% etc.(4) austenitic heat-resistance steel: high-temperature oxidation resistance and hot strength are better, plasticity and toughness are high, but the coefficient of expansion is big, resistance type ability and wear resistance are relatively poor, and cost is higher.(5) jessop: the coefficient of expansion is little, resistance type ability and resistance of oxidation are better, the raising but its high-temperature behavior is still needed.On May 15th, 2002, disclosed publication number was 1349001 Chinese patent " a kind of preparation composite reinforced heat resisting steel with carbide particle method and apparatus "; By several kinds among C, Ti, Nb, Ta, W, the Al mixed powder wrapped line and the Cr 24～28% that form, Ni 13～18%, and the mother alloy liquid successive reaction of C 0.5～3% generates TiC; NbC; TaC, the WC compound, and under function composite by electromagnetic stirring, make it uniform distribution.
Along with raising to agglomerate output and specification of quality; The increase of agglomerate thickness, sintering temperature and the prolongation of time; The performance of grid section material especially high-temperature oxidation resistance, hot strength, high temperature abrasion resistance and thermal fatigue resistance etc. is had higher requirement, and traditional material has been difficult to meet the demands.Therefore, heat resistance material that development cost is cheap, hot strength is high, wear resistance is good and technology of preparing thereof are very necessary.
Summary of the invention
To the deficiency of prior art, one of the object of the invention is to provide a kind of sinter machine grid to use high temperature steel.
A kind of sinter machine grid is used high temperature steel, and the chemical ingredients of this high temperature steel is made up of following component in per-cent (weight): C:0.08～0.12, Si:0.6～0.8, Mn:1.2～1.4; Cr:12.0～14.0, Mo:1.3～1.5, W:0.5～0.7, Co:1.5～1.7, V:0.10～0.12; B:0.05～0.07, Nb:0.2～0.4, Ti:0.08～0.10; S≤0.03, P≤0.05, surplus is iron and unavoidable impurities.
Preferably, the chemical ingredients of this high temperature steel is made up of following component in per-cent (weight): C:0.09～0.11, Si:0.65～0.75, Mn:1.25～1.35; Cr:12.5～13.5, Mo:1.35～1.45, W:0.55～0.65, Co:1.55～1.65, V:0.105～0.115; B:0.055～0.065, Nb:0.25～0.35, Ti:0.085～0.095; S≤0.03, P≤0.05, surplus is iron and unavoidable impurities.
Most preferably, the chemical ingredients of this high temperature steel is made up of following component in per-cent (weight): C:0.10, Si:0.70, Mn:1.30; Cr:13.0, Mo:1.40, W:0.60, Co:1.60, V:0.11; B:0.060, Nb:0.30, Ti:0.090; S≤0.03, P≤0.05, surplus is iron and unavoidable impurities.
The design of the main alloy element in the above-mentioned chemical ingredients of high temperature steel of the present invention the reasons are as follows:
Chromium: improve solidity to corrosion and oxidation-resistance.For guaranteeing both had good solidity to corrosion and oxidation-resistance, do not damage creep rupture strength at high temperatures again, chromium content is defined between 12.0～14.0% in the steel of the present invention.
Cobalt: favourable to improving creep-rupture strength, but increase cost, restriction is used as far as possible.The content of cobalt is defined between 1.5～1.7% in the steel of the present invention.
Molybdenum and tungsten: play solution strengthening, promote the effect that MX type carbonitride is separated out with nano-form simultaneously in addition.But too much can cause δ-ferritic to form, reduce intensity and toughness.In addition, tungsten has the trend that promotes that above-mentioned deleterious Z forms mutually in high temperature military service process, quickens the degeneration of hot strength.Therefore, in the steel of the present invention, the content of tungsten is controlled between 0.5～0.7%, and the content of molybdenum is controlled between 1.3～1.5%.
Niobium and titanium: form the element of MX type precipitated phase, niobium and titanium have the effect of crystal grain thinning simultaneously.
Vanadium and boron: form the element of MX type precipitated phase, improve the element of wear resisting property.
Silicon and carbon: improve mechanical property, improve anti-erosion property.
The present invention has following beneficial effect:
(1) the present invention is directed to sinter machine grid and the composition of alloying element has been carried out optimization design with the applying working condition of steel; Do not use expensive Ni element, and under guide of theory, and on the basis of a large amount of orthogonal tests, filter out suitable constituent content; The content of reasonably combined V and B element improves wear resistance; The content of reasonably combined Mo, W and Co element improves resistance to elevated temperatures, and the content of reasonably combined Si, Mn, Cr, C element improves anti-erosion property, the grain fineness number of the content control steel of reasonably combined Nb and Ti; The action effect of each element is collaborative each other, makes the excellent combination property of this high temperature steel.
Embodiment
Embodiment one
A kind of sinter machine grid is used high temperature steel, and the chemical ingredients of this high temperature steel is made up of following component in per-cent (weight): C:0.08, Si:0.8, Mn:1.2; Cr:14.0, Mo:1.3, W:0.7, Co:1.5, V:0.12; B:0.05, Nb:0.4, Ti:0.08; S≤0.03, P≤0.05, surplus is iron and unavoidable impurities.
Embodiment two
A kind of sinter machine grid is used high temperature steel, and the chemical ingredients of this high temperature steel is made up of following component in per-cent (weight): C:0.12, Si:0.6, Mn:1.4; Cr:12.0, Mo:1.5, W:0.5, Co:1.7, V:0.10; B:0.07, Nb:0.2, Ti:0.10; S≤0.03, P≤0.05, surplus is iron and unavoidable impurities.
Embodiment three
A kind of sinter machine grid is used high temperature steel, and the chemical ingredients of this high temperature steel is made up of following component in per-cent (weight): C:0.09, Si:0.75, Mn:1.25; Cr:13.5, Mo:1.35, W:0.65, Co:1.55, V:0.115; B:0.055, Nb:0.35, Ti:0.085; S≤0.03, P≤0.05, surplus is iron and unavoidable impurities.
Embodiment four
A kind of sinter machine grid is used high temperature steel, and the chemical ingredients of this high temperature steel is made up of following component in per-cent (weight): C:0.11, Si:0.65, Mn:1.35; Cr:12.5, Mo:1.45, W:0.55, Co:1.65, V:0.105; B:0.065, Nb:0.25, Ti:0.095; S≤0.03, P≤0.05, surplus is iron and unavoidable impurities.
Embodiment five
A kind of sinter machine grid is used high temperature steel, and the chemical ingredients of this high temperature steel is made up of following component in per-cent (weight): C:0.10, Si:0.7, Mn:1.3; Cr:13.0, Mo:1.4, W:0.6, Co:1.6, V:0.11; B:0.06, Nb:0.3, Ti:0.09; S≤0.03, P≤0.05, surplus is iron and unavoidable impurities.
Applicant's statement; The present invention explains detailed process equipment of the present invention and technical process through the foregoing description; But the present invention is not limited to above-mentioned detailed process equipment and technical process, does not mean that promptly the present invention must rely on above-mentioned detailed process equipment and technical process could be implemented.The person of ordinary skill in the field should understand, and to any improvement of the present invention, to the interpolation of the equivalence replacement of each raw material of product of the present invention and ancillary component, the selection of concrete mode etc., all drops within protection scope of the present invention and the open scope.
Claims (3)
1. a sinter machine grid is used high temperature steel, it is characterized in that, the chemical ingredients of this high temperature steel is made up of following component in per-cent (weight): C:0.08～0.12, Si:0.6～0.8; Mn:1.2～1.4, Cr:12.0～14.0, Mo:1.3～1.5, W:0.5～0.7, Co:1.5～1.7, V:0.10～0.12; B:0.05～0.07, Nb:0.2～0.4, Ti:0.08～0.10; S≤0.03, P≤0.05, surplus is iron and unavoidable impurities.
2. a kind of sinter machine grid as claimed in claim 1 is used high temperature steel, it is characterized in that, the chemical ingredients of this high temperature steel is made up of following component in per-cent (weight): C:0.09～0.11; Si:0.65～0.75, Mn:1.25～1.35, Cr:12.5～13.5; Mo:1.35～1.45, W:0.55～0.65, Co:1.55～1.65, V:0.105～0.115, B:0.055～0.065; Nb:0.25～0.35, Ti:0.085～0.095, S≤0.03; P≤0.05, surplus are iron and unavoidable impurities.
3. a kind of sinter machine grid as claimed in claim 2 is used high temperature steel, it is characterized in that, the chemical ingredients of this high temperature steel is made up of following component in per-cent (weight): C:0.10, Si:0.70; Mn:1.30, Cr:13.0, Mo:1.40, W:0.60, Co:1.60, V:0.11; B:0.060, Nb:0.30, Ti:0.090; S≤0.03, P≤0.05, surplus is iron and unavoidable impurities.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210020351.XA CN102703820B (en) | 2012-01-19 | 2012-01-19 | Heat resistant steel for sintering machine grates |
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| CN201210020351.XA CN102703820B (en) | 2012-01-19 | 2012-01-19 | Heat resistant steel for sintering machine grates |
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| CN102703820A true CN102703820A (en) | 2012-10-03 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107766626A (en) * | 2017-09-28 | 2018-03-06 | 河南理工大学 | A kind of factor of influence evaluation method for the liquid fixed double phase flow Erosive Properties for considering interaction of multiple factors |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6162307A (en) * | 1998-03-13 | 2000-12-19 | Nippon Steel Corporation | BN-precipitation-strengthened low-carbon-ferritic heat-resistant steel excellent in weldability |
| CN101151388A (en) * | 2005-04-07 | 2008-03-26 | 住友金属工业株式会社 | Ferritic heat-resistant steel |
| CN101397642A (en) * | 2008-10-31 | 2009-04-01 | 郭玉宝 | Heat-resistant steel for coke oven grate bars |
-
2012
- 2012-01-19 CN CN201210020351.XA patent/CN102703820B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6162307A (en) * | 1998-03-13 | 2000-12-19 | Nippon Steel Corporation | BN-precipitation-strengthened low-carbon-ferritic heat-resistant steel excellent in weldability |
| CN101151388A (en) * | 2005-04-07 | 2008-03-26 | 住友金属工业株式会社 | Ferritic heat-resistant steel |
| CN101397642A (en) * | 2008-10-31 | 2009-04-01 | 郭玉宝 | Heat-resistant steel for coke oven grate bars |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107766626A (en) * | 2017-09-28 | 2018-03-06 | 河南理工大学 | A kind of factor of influence evaluation method for the liquid fixed double phase flow Erosive Properties for considering interaction of multiple factors |
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