CN102277541B - Rare earth alloy steel grid section of sintering pallet - Google Patents
Rare earth alloy steel grid section of sintering pallet Download PDFInfo
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- CN102277541B CN102277541B CN 201110224000 CN201110224000A CN102277541B CN 102277541 B CN102277541 B CN 102277541B CN 201110224000 CN201110224000 CN 201110224000 CN 201110224000 A CN201110224000 A CN 201110224000A CN 102277541 B CN102277541 B CN 102277541B
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Abstract
The invention belongs to sintering equipment for iron ores, and particularly relates to a part of a sintering pallet. The invention relates to a rare earth alloy steel grid section of the sintering pallet, and the grid section steel is composed of the following components in percentage by weight (wt%): 0.8-1.8% of C, 1.0-1.6% of Si, 0.5-1.2% of Mn, 18-30% of Cr, 0.6-1.4% of Ni, 0.6-1.2% of Mo, 0.1-0.8% of Re, less than or equal to 0.03% of P and the balance of Fe. The grid section is characterized in that a grid section body is thickened and is provided with a panel-shaped workbench, and centers of two sides are provided with trapezoidal bosses. The grid section has the advantages that the ingredients of the grid section steel is optimized, the grid section has reasonable structure, and the heat resistance and the high-temperature oxidation resistance of the grid section are obviously enhanced; high-temperature strength and creep resistance are improved, the grid section is prevented from generating the phenomena of oxide layer stripping, high-temperature deformation and breakage, and the service life of the grid section is prolonged by above one time; and the consumption of spare parts is lowered, downtime for replacing the grid section is reduced, and sintering production can be guaranteed to successfully carry out.
Description
Technical field
The invention belongs to the agglomerating plant of iron ore, relate in particular to the component of sintering pallet.
Background technology
Grid section is the normal consumption component of sintering pallet, directly affects the stable and cost of SINTERING PRODUCTION in its quality and work-ing life.Continuous progress along with sintering technology, SINTERING PRODUCTION progressively develops into present " the thick bed of material, high negative pressure, Wind Volume " by in the past " the thin bed of material, lower negative pressure, little air quantity ", and bed thickness is brought up to 800mm by 450mm, negative pressure is brought up to 17kpa by 12kpa, and air quantity is by 90m
3/ m
2Bring up to 100m
3/ m
2, the thermal load of grid section increases more than the twice.The Normal Steel Casting grid section thin thickness of current use, working face is arc surface, adjacent two grid sections are located by round platform.Its defective is, the circular arc working face is large with the sintered material contact area, forms depression between two grid sections, easily piles up and the sintered material that bonds; Thermostability and creep resisting ability are low, and high temperature deformation and phenomenon of rupture easily occur; Especially adopt Normal Steel Casting grid section resistance toheat and antioxidant property poor, under 1300 ℃ high temperature, be prone to spalling of oxide layer; Grid section is low work-ing life, only has about 6 months, and spare parts consumption is many, and it is long that the grid section consumption time is changed in shutdown, has a strong impact on SINTERING PRODUCTION and carry out smoothly, increased production cost.
Summary of the invention
The defective that exists in order to overcome prior art; the purpose of this invention is to provide a kind of rare earth alloy steel grid section of sintering pallet; optimize the grid section steel; improve the grid section structure; improve resistance toheat, high-temperature oxidation resistance and the hot strength of grid section; prolong grid section work-ing life, reduce the stop time of changing grid section, guarantee that SINTERING PRODUCTION carries out smoothly.
Rare earth alloy steel grid section of sintering pallet, this grid section steel by weight percentage (wt%) is comprised of following component:
C 0.8-1.8, Si 1.0-1.6, Mn 0.5-1.2, Cr18-30, Ni 0.6-1.4, Mo 0.6-1.2, Re 0.1-0.8, P≤0.03, all the other are Fe.
The present invention further improves, and (wt%) is comprised of following component by weight percentage:
C 0.8-1.6, Si 1.0-1.3, Mn 0.5-0.7, Cr18-26, Ni 0.6-1.0 Mo 0.6-0.8, Re 0.1-0.5, all the other are Fe.
The present invention further improves, and (wt%) is comprised of following component by weight percentage:
C 1.7-1.8, Si 1.4-1.6, Mn 0.8-1.2, Cr27-30, Ni 1.1-1.4, Mo 0.9-1.2, Re 0.6-0.8, all the other are Fe.
Alloying element content has conclusive effect to the bogie grates resistance toheat; Cr is the oxidation resistant main element of cast steel, it and oxygen are combined in cast(ing) surface and form fine and close oxide film, block the oxidation passage, rising along with Cr content, free cementite disappears, carbide structure is unstable by M3C(in the foundry goods) → M7C3 type (meta) → M23C6 type (stablizing), the matrix Main Tissues is corresponding to perlite → ferrite → austenite.By the graceful law of tower as can be known, cast steel with high chromium has and fully anti-oxidantly must satisfy Cr/C formula Cr+Ni 〉=10C.Cr can improve the eutectoid transformation temperature simultaneously, and the Cr amount surpasses 26%, Ac1 and improves nearly 200 ℃, reduces the generation of phase transformation crackle, has suppressed oxidation and the growth of cast steel.Ni is good anticorrosive element, and electropotential is high, and chemical stability is good, can significantly improve hot strength and the toughness of cast steel with high chromium.Mo can obviously improve the thermal fatigue property of cast steel with high chromium, improves the matrix phase temperature, strengthens matrix, and data shows that the thermal fatigue property (mainly point out existing first Crack before cycle index) of 1% the Mo ash cast steel that has added has promoted 4 times.Illustrate that the content that improves superalloy element Cr, Ni, Mo can strengthen the bogie grates resistance toheat, prolongs its work-ing life at double.Yttrium base rare earth adds in the steel, and impelling strength and hardness that can the Effective Raise cast steel with high chromium remedy the relative deficiency of the bullion contents such as Mo, Ni.Because the metamorphism of Yttrium base rare earth, the size reduction of carbide alleviates the degree of isolating of metallic matrix, and the hot strength of foundry goods increases, and slack-off along high temperature oxidation and the high growth temperature of crystal boundary, significantly improve work-ing life.
Rare earth alloy steel grid section of sintering pallet, establish working face on the comb body, positioning table is established in both sides, heat dam is established in two ends and chassis contact site, characteristics are the thickenings of comb body, and described working face is plate shaped, reduce working face and sintered material contact surface, two adjacent grid section working face planes join, and avoid the joint sintered material to pile up and bonding; Described positioning table is located at both sides, comb body middle part, is trapezoid boss, both played the role of positioning, more can play the stiffening web effect, strengthen condition of high temperature stability inferior, improve the grid section creep resisting ability.
Compared with prior art, advantage is that grid section is optimized with steel constitution, grid section is rational in infrastructure, resistance toheat and the high-temperature oxidation resistance of grid section have significantly been strengthened, hot strength and creep-resistant property have been improved, avoid grid section spalling of oxide layer, high temperature deformation and phenomenon of rupture to occur, grid section prolongs more than one times work-ing life; Reduce spare parts consumption, reduce the stop time of changing grid section, the assurance SINTERING PRODUCTION is carried out smoothly.
Description of drawings
The invention will be further described below in conjunction with drawings and Examples.
Fig. 1 is rare earth alloy steel grid section of sintering pallet 500X metallograph.
Fig. 2 is Normal Steel Casting grid section 500X metallograph.
Fig. 3 is the rare earth alloy steel grid section of sintering pallet structural representation.
Fig. 4 is the vertical view of Fig. 3.
Embodiment
Embodiment 1
Press the composition of appointment in the table 1 and smelt rare earth alloy steel, then be cast as sintering machine bogie grates.
Press the composition of appointment in the table 1 and smelt rare earth alloy steel, then be cast as sintering machine bogie grates.
Press the composition of appointment in the table 1 and smelt rare earth alloy steel, then be cast as sintering machine bogie grates.
Embodiment 4
Press the composition of appointment in the table 1 and smelt rare earth alloy steel, then be cast as sintering machine bogie grates.
The component concentration table of table 1 rare earth alloy steel grid section of sintering pallet steel (by weight percentage wt%)
| Embodiment | C | Si | Mn | Cr | Ni | Mo | Re | Fe |
| 1 | 0.8 | 1.0 | 0.5 | 18 | 0.6 | 0.6 | 0.1 | |
| 2 | 1.2 | 1.2 | 0.8 | 22 | 0.8 | 0.8 | 0.3 | |
| 3 | 1.5 | 1.4 | 1.0 | 25 | 1.0 | 1.0 | 0.5 | Surplus |
| 4 | 1.8 | 1.6 | 1.2 | 30 | 1.4 | 1.2 | 0.8 | Surplus |
Can be found out by Fig. 1,2, the matrix of rare earth alloy steel grid section (steel) and Normal Steel Casting grid section (steel) is austenite+martensite+eutectic carbides.The rare earth composite inoculating does not obviously change the pattern of leading phase, leading degree and carbide take austenite as main eutectic, but the obvious refinement of carbide size, the primary crystal carbide disperses unsetting, is interrupted distribution; The primary crystal carbide of Normal Steel Casting is continuous regular and distributes.Find out from crystal boundary, rare earth alloy cast steel carbide is the granular distribution of disperse, and the Normal Steel Casting carbide is strip/sheet distribution.
Can be found out by Fig. 3, Fig. 4, rare earth alloy steel grid section of sintering pallet, comb body 1 is thickeied to 35mm by 30mm, establishes plate working face 2 on the comb body, the carrying sintered material.Up-narrow and down-wide trapezoid boss 3 is vertically established in both sides, comb body middle part, and trapezoid boss is conducive to the grid section location, can improve grid section intensity again.Heat dam 4 is established in grid section two ends and chassis contact site, alleviates grid section to the thermal conduction of chassis, is conducive to prolong the work-ing life of chassis.
Claims (3)
1. rare earth alloy steel grid section of sintering pallet, this grid section steel by weight percentage (wt%) is comprised of following component: C 0.8-1.8, Si 1.0-1.6, Mn 0.5-1.2, Cr18-30, Ni 0.6-1.4, Mo 0.6-1.2, Re 0.1-0.8, P≤0.03, all the other are Fe; The comb body is established working face on (1), and positioning table is established in both sides, and heat dam (4) is established in two ends and chassis contact site, it is characterized in that described comb body thickening, described working face (2) is plate shaped, and described positioning table is trapezoid boss (3), is located at both sides, grid section center.
2. rare earth alloy steel grid section of sintering pallet according to claim 1, this grid section steel by weight percentage (wt%) is comprised of following component:
C 0.8-1.6, Si 1.0-1.3, Mn 0.5-0.7, Cr18-26, Ni 0.6-1.0, Mo 0.6-0.8, Re 0.1-0.5, all the other are Fe.
3. rare earth alloy steel grid section of sintering pallet according to claim 1, this grid section steel by weight percentage (wt%) is comprised of following component:
C 1.7-1.8, Si 1.4-1.6, Mn 0.8-1.2, Cr 27-30, Ni 1.1-1.4, Mo 0.9-1.2, Re 0.6-0.8, all the other are Fe.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201110224000 CN102277541B (en) | 2011-08-05 | 2011-08-05 | Rare earth alloy steel grid section of sintering pallet |
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|---|---|---|---|
| CN 201110224000 CN102277541B (en) | 2011-08-05 | 2011-08-05 | Rare earth alloy steel grid section of sintering pallet |
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| CN102277541B true CN102277541B (en) | 2013-03-27 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102605289B (en) * | 2012-03-13 | 2013-08-28 | 天津得利伟机械制造有限公司 | Fire grate strip of sintering machine and manufacturing method of fire grate strip |
| CN102672166B (en) * | 2012-06-11 | 2013-12-25 | 天津市铸金表面工程材料科技开发有限公司 | High-temperature wear-resisting iron-base alloy powder |
| CN108955258A (en) * | 2018-09-29 | 2018-12-07 | 湖南华菱湘潭钢铁有限公司 | Steel produces sintering machine fire grate bar |
| CN111074065A (en) * | 2019-12-31 | 2020-04-28 | 安徽马钢输送设备制造有限公司 | Precoated sand sintering grate bar for sintering pallet and process |
| CN112853204A (en) * | 2020-12-30 | 2021-05-28 | 唐山腾龙重型机械设备制造有限公司 | High-purity rare earth microalloying grate bar and manufacturing method thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2223468Y (en) * | 1994-12-01 | 1996-03-27 | 马鞍山钢铁股份有限公司 | Car grid section for channel insulation sintering machine |
| CN1401810A (en) * | 2002-08-23 | 2003-03-12 | 广东广研新材料科技股份有限公司 | Abrasion-resistant iron and steel material |
| CN1970184A (en) * | 2006-12-12 | 2007-05-30 | 袁厚之 | Steel pipe-straightening roller for casting high chromium iron or high chrome steel |
| CN101705435A (en) * | 2008-04-23 | 2010-05-12 | 安徽省凤形耐磨材料股份有限公司 | Production method of ultrahard high-chromium cast grinding ball |
-
2011
- 2011-08-05 CN CN 201110224000 patent/CN102277541B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2223468Y (en) * | 1994-12-01 | 1996-03-27 | 马鞍山钢铁股份有限公司 | Car grid section for channel insulation sintering machine |
| CN1401810A (en) * | 2002-08-23 | 2003-03-12 | 广东广研新材料科技股份有限公司 | Abrasion-resistant iron and steel material |
| CN1970184A (en) * | 2006-12-12 | 2007-05-30 | 袁厚之 | Steel pipe-straightening roller for casting high chromium iron or high chrome steel |
| CN101705435A (en) * | 2008-04-23 | 2010-05-12 | 安徽省凤形耐磨材料股份有限公司 | Production method of ultrahard high-chromium cast grinding ball |
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