CN101709917A - Grate plate of pellet traveling grate and preparation method thereof - Google Patents
Grate plate of pellet traveling grate and preparation method thereof Download PDFInfo
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- CN101709917A CN101709917A CN200910264457A CN200910264457A CN101709917A CN 101709917 A CN101709917 A CN 101709917A CN 200910264457 A CN200910264457 A CN 200910264457A CN 200910264457 A CN200910264457 A CN 200910264457A CN 101709917 A CN101709917 A CN 101709917A
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Abstract
A grate plate of a pellet traveling grate and a preparation method thereof relate to a structural technology of the grate plate of the traveling grate in the iron and steel smelting pellet technology. The preparation method comprises the following steps: hot-melting the alloy formed by C, Si, Mn, Cr, Mo, W, Ni, Al, V, P and S elements, pouring in the casting box formed by moulding sand, curing agent, silane and resin, cooling, demoulding, quenching at 1000-1100 DEG C, and finally tempering to prepare the grate plate of the pellet traveling grate, wherein the plate body of the grate plate is provided with at least two rows of long through-holes, and the through-holes at the four corners of the plate body are provided with connection ribs which are vertical to the length direction of the through-holes. Therefore, the fracture resistance, fatigue resistance, oxidation resistance, heat resistance and wear resistance of the product are enhanced, the expansion coefficient is reasonable, and the service life is up to 16-18 months. As the grate plate of the invention has good overall performance, needs a little repair and saves the raw material, the labor intensity of users and the production cost are significantly reduced so as to realize efficient, energy-saving and environmentally friendly production.
Description
Technical field
The present invention relates to a kind of structure technology that is used for the grate plate of smelting iron and steel pelletizing process.
Background technology
The pellet chain combing machines grate plate is carried out thermal cycle (circulation cycle be 50 week/24 hour) repeatedly under 200 ℃～1050 ℃ working environment, therefore, high to the requirement of grate plate thermal fatigue property, and require harsh to its wear resistance at elevated temperature, antioxygenic property and the coefficient of expansion and thermal stress.Though adopting, at present domestic some producer changes grate plate geometries or material, or molded the making of employing disappearance, or employing reiforcing laser impact technology and technology such as " QPQ " salt bath Combined Processing and laser melting coating, but can't solve grate plate carries out very easily producing fire check and material oxidation defective in the thermal cycle operating mode at 200 ℃～1050 ℃ repeatedly.Fire check is further constantly being expanded under the thermal stress effect, finally causes the grate plate fracture; And material oxidation finally causes the grate plate physical dimension to change, and easy to leak shot or impurity cause the stuck or shutdown of drying grate.Above-mentioned grate plate defective also directly causes grate plate short service life.The result shows according to investigations, and present domestic grate plate service life, generally at 6～8 months, the longest also is no more than 10～12 months; The Japanese grate plate of import also is no more than 13～15 months service life.
Summary of the invention
The object of the invention is to design a kind of grate plate of pellet traveling grate that can effectively avoid grate plate that fire check and material oxidation take place under 200 ℃～1050 ℃ working environment.
The present invention is provided with at least two platoon leader's type through holes on plate body, it is characterized in that being provided with on the through hole of four jiaos of plate bodys the dowel vertical with the through hole length direction.
The present invention has strengthened the intensity of four jiaos of plate bodys, and the anti-fracture, antifatigue of product, anti-oxidant and heat-resistant antifriction performance are strengthened, and the coefficient of expansion is reasonable, and can reach 16～18 months service life.Because overall performance of the present invention is good, maintenance capacity is few, has saved raw material, makes the user significantly reduce labour intensity and production cost, has realized highly effective energy-conserving environmental-protecting type production.
Plate body of the present invention is made up of C, Si, Mn, Cr, Mo, Ni, W, AL, V, P and S element.
The percentage that each element accounts for gross mass is respectively C=0.5～0.7%, Si=1.4～1.6%, Mn=1.2～1.5%, Cr=24.0～28.0%, Mo=1.0～3.0%, Ni=8.0～14.0%, W=1.0～2.0%, AL≤1.8%, V≤0.3%, P≤0.10%, S≤0.10%.Plate body good combination property of the present invention, the intensity height, heat-resistant antifriction, antifatigue, antioxygenic property and the coefficient of expansion are reasonable, long service life.
The present invention also provides a kind of production method of producing above grate plate of pellet traveling grate:
After the alloy heat that C, Si, Mn, Cr, Mo, Ni, W, AL, V, P and S element are formed is melted, be cast in the moulding box that forms by molding sand, curing agent, silane and resin, the cooling rear demoulding, again through 1000～1100 ℃ of quenchings, tempering is at last made.
The percentage that each element accounts for the alloy gross mass in the described alloy is respectively C=0.5～0.7%, Si=1.4～1.6%, Mn=1.2～1.5%, Cr=24.0～28.0%, Mo=1.0～3.0%, Ni=8.0～14.0%, W=1.0～2.0%, AL≤1.8%, V≤0.3%, P≤0.10%, S≤0.10%.
When producing moulding box, resin is the 1.5-2.0% of molding sand quality, and curing agent is the 35-50% of resin quality, and silane is the 0.15-0.2% of resin quality.
The present invention adopts phenolic sand molding technology, and the tensile strength that makes resin sand is greater than 8～10kg/cm
2, compression strength is greater than 25～30kg/cm
2, captured the unavoidable casting flaw of disappearance mould, make moulding process precision height, significantly reduce production costs, enhance productivity.Reasonably technology and prescription can effectively improve the anti-fracture of pellet chain combing machines grate plate, antifatigue, antioxygenic property.
Description of drawings
Fig. 1 is a kind of structural representation of the present invention.
The specific embodiment
One, according to the concrete applying working condition of pellet chain combing machines grate plate, its presentation quality is required harshness, geometric accuracy height, and smooth surface do not have any casting flaw, adopt the metal pattern of manufacturing meticulously.
Two, at the grate plate of present domestic use, in use, ubiquity grate plate four corners position very easily produces fire check (finally causing fracture).Carry out in the thermal cycle operating mode for effectively controlling the pellet chain combing machines grate plate repeatedly at 200 ℃～1050 ℃, the grate plate four corners position, very easily produce fire check, on the grate plate base of present domestic use, improve, the grate plate four corners position has been added the horizontal bar of wide 9mm respectively, increased the service life thus 5～6 months.
Three, adopt phenolic sand molding technology, captured the unavoidable casting flaw of disappearance mould.Molding sand, curing agent, silane and mixed with resin are adopted in the resin sand preparation, and molding sand and core sand mix system through selected back respectively, and the tensile strength of resin sand should be greater than 8～10kg/cm
2, compression strength should be greater than 25～30kg/cm
2, after sclerosis, carrying out molding again, repair type, die cavity and loam core coating adopt the alcohol-base paint brushing, back core mould assembling down.
Wherein, resin sand materials proportioning:
Resin: the 1.6-1.8% of sand weight
Curing agent: the 35-50% of resin addition
Silane: 0.2% of resin addition
Sand mulling craft:
With molding sand, curing agent, resin, silane blend 50-80 second.
Four, be effectively to improve the anti-fracture of pellet chain combing machines grate plate, antifatigue, antioxygenic property, increase alloys such as nickel, molybdenum, aluminium, vanadium, tungsten, rare earth in right amount, make its element (mass percent) be controlled at C=0.5～0.7%, Si=1.4～1.6%, Mn=1.2～1.5%, Cr=24.0～28.0%, Mo=1.0～3.0%, Ni=8.0～14.0%, W=1.0～2.0%, AL≤1.8%, V≤0.3%, P≤0.10%, S≤0.10% scope; And adopt new alloying and inoculation process, pour into the grate plate foundry goods by casting pattern.
Five, for guaranteeing the grate plate heat-resistant antifriction, foundry goods passes through tempering again by quenching (maximum temperature is controlled at 1000～1100 ℃).
Six, the foundry goods dead head is cleared up, and carried out polishing.
Seven, shape of product:
As shown in Figure 1, on plate body 1, be provided with three platoon leader's type through holes 2, on two through holes 2 of 1 four jiaos of plate bodys, be respectively equipped with and the corresponding vertical dowel 3 of through hole 2 length directions.
This technology has good cost performance, than every cheap 50～100 yuan of present domestic grate plate prices, a production line overhaul, be client's direct saving 40～500,000 yuan, article 2, production line overhaul can be client's direct saving 80～1,000,000 yuan, than the prolongation of Japan 1/5.
Claims (6)
1. grate plate of pellet traveling grate comprises plate body, is provided with at least two platoon leader's type through holes on plate body, it is characterized in that being provided with on the through hole of four jiaos of plate bodys the dowel vertical with the through hole length direction.
2. according to the described grate plate of pellet traveling grate of claim 1, it is characterized in that described plate body is made up of C, Si, Mn, Cr, Mo, Ni, W, AL, V, P and S element.
3. according to the described grate plate of pellet traveling grate of claim 2, it is characterized in that the percentage that described each element accounts for gross mass is respectively C=0.5～0.7%, Si=1.4～1.6%, Mn=1.2～1.5%, Cr=24.0～28.0%, Mo=1.0～3.0%, Ni=8.0～14.0%, W=1.0～2.0%, AL≤1.8%, V≤0.3%, P≤0.10%, S≤0.10%.
4. production method of grate plate of pellet traveling grate according to claim 1, after it is characterized in that the alloy heat that C, Si, Mn, Cr, Mo, Ni, W, AL, V, P and S element form melted, be cast in the moulding box that forms by molding sand, curing agent, silane and resin, the cooling rear demoulding, through 1000～1100 ℃ of quenchings, last tempering is made again.
5. according to the production method of the described grate plate of pellet traveling grate of claim 4, it is characterized in that the percentage that each element in the described alloy accounts for the alloy gross mass is respectively C=0.5～0.7%, Si=1.4～1.6%, Mn=1.2～1.5%, Cr=24.0～28.0%, Mo=1.0～3.0%, Ni=8.0～14.0%, W=1.0～2.0%, AL≤1.8%, V≤0.3%, P≤0.10%, S≤0.10%.
6. according to the production method of claim 4 or 5 described grate plate of pellet traveling grate, it is characterized in that in the moulding box that resin is the 1.5-2.0% of molding sand quality, curing agent is the 35-50% of resin quality, and silane is the 0.15-0.2% of resin quality.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910264457A CN101709917A (en) | 2009-12-23 | 2009-12-23 | Grate plate of pellet traveling grate and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910264457A CN101709917A (en) | 2009-12-23 | 2009-12-23 | Grate plate of pellet traveling grate and preparation method thereof |
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| Publication Number | Publication Date |
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| CN101709917A true CN101709917A (en) | 2010-05-19 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN200910264457A Pending CN101709917A (en) | 2009-12-23 | 2009-12-23 | Grate plate of pellet traveling grate and preparation method thereof |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102383051A (en) * | 2011-10-20 | 2012-03-21 | 江苏明雨耐磨材料有限公司 | High strength anti-fatigue pellet chain grate grid plate and production process thereof |
| CN107099753A (en) * | 2017-04-13 | 2017-08-29 | 山东远大锅炉配件制造有限公司 | Blast cap of circulating fluidized bed boiler rare-earth and high chromium nickel tungsten multicomponent alloy heat resisting steel |
| CN110343965A (en) * | 2019-07-31 | 2019-10-18 | 广东华域重工有限公司 | A kind of high-intensity special-shaped steel and preparation method thereof |
| 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 |
-
2009
- 2009-12-23 CN CN200910264457A patent/CN101709917A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102383051A (en) * | 2011-10-20 | 2012-03-21 | 江苏明雨耐磨材料有限公司 | High strength anti-fatigue pellet chain grate grid plate and production process thereof |
| CN107099753A (en) * | 2017-04-13 | 2017-08-29 | 山东远大锅炉配件制造有限公司 | Blast cap of circulating fluidized bed boiler rare-earth and high chromium nickel tungsten multicomponent alloy heat resisting steel |
| CN110343965A (en) * | 2019-07-31 | 2019-10-18 | 广东华域重工有限公司 | A kind of high-intensity special-shaped steel and preparation method thereof |
| 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 |
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Open date: 20100519 |