CN100519003C - Process for producing casting and seeping foreplate of rolling mill - Google Patents
Process for producing casting and seeping foreplate of rolling mill Download PDFInfo
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Abstract
The invention discloses a casting guiding plate for steel rolling machines and a process for preparation, which belongs to the technical field of steel rolling. The invention comprises firstly, grinding high carbon iron-chrome, vanadium iron, ferrotitanium and rare earth-iron-silicon into 200-300 orders with a ball grinder and mixing evenly, and then, adding nickel-clad aluminum oxide powder 250-300 orders, wherein the adding amount of high carbon iron-chrome powder is 60-70%, the adding amount of vanadium iron powder is 10-15%, the adding amount of ferrotitanium powder is 2-5%, the adding amount of earth-iron-silicon powder is 1-1.5%, the adding amount of earth-iron-silicon powder is 1-1.5%, and the adding amount of the nickel-clad aluminum oxide powder is 15-20%, then, adding resin whose amount is 2.5-3.5 % of the whole amount of powder and mixing, and then, compressing on a surface of a mould, wherein a compressing position is corresponded with a working surface of the guiding plate. Liquid steel of medium carbon low-alloy steel whose temperature is 1600-1650 DEG C is directly poured into the mould after time for alloy powder to be solidified with the resin is over 30 minutes, then, boxes are opened to cool the guiding plate, and the guider can be used directly without heat treatments after sand-cleaning and grinding. The invention has simple process and whose adding amount of alloy is little, working efficiency can be increased, surface qualities of mill bars can be improved, and producing cost of the mill bars can be lowered.
Description
Technical field
The present invention is the preparation method of shape rolling mill foreplate, and particularly a kind of preparation method of casting and seeping foreplate of rolling mill belongs to technical field of steel rolling.
Background technology
In bar and shape mill was produced, foreplate was one of servicing unit of rolling mill, and mould is absolutely necessary.They are bearing the chilling action of thermic load, impact, high speed wearing and tearing, extruding and the cooling water of red-hot base in the process under arms, thereby require material to possess higher mechanical strength, hardness, wearability, impact flexibility and antioxygenic property and thermal fatigue resistance etc.The life-span of improving foreplate not only can increase steel rolling output, and can improve the stocking surface quality and reduce labor strength.At present, the most high-chromium-nickel alloy steels that adopt of high-quality foreplate are done, Liu's bright (formulation of rod-rolling mill foreplate Technology for Heating Processing, " metal heat treatmet " 2005 the 30th volumes o. 11th) has studied a kind of 0.9～1.2C that contains, 15～17Cr, 3.0～4.5Ni, 0.8～1.2Si, 0.6～1.0Mn,＜0.05S, the high-chromium-nickel alloy steel foreplate of＜0.05P, wearability is good.This foreplate is because of the carbon content height, and fragility is bigger, and contains more alloying element, and production cost is higher.
Chinese invention patent CN1088271 provides a kind of high temperature wear resistant alloy and manufacturing technology thereof.It is to be main alloy element with Cr, and is added with the ferrous alloy of multiple elements such as Ni, Mo, W, Cu, N, C, Si, Mn simultaneously.In preparation process, adopt the synthetic intermediate alloy of rare earth and alkaline earth element to go bad after the processing, its microscopic structure has the isolated thin bulk and the M of disconnected strip
7C
3Higher etc. high rigidity alloy carbide and super saturated solid solution reinforcing degree, and the moderate austenitic matrix of stability.γ → α phase transformation does not take place in this alloy under the high temperature that alternation is heated, but has high temperature precipitation-hardening effect, as the high-temperature and wear-proof that alternation is heated, has alleviated the contradiction of wearability and thermal fatigue property preferably.Be heated to reach on the roller guide and guard unit more than 900 ℃ at alternation and use, improved durability greatly, alloying elements such as expensive Ni, Mo, W, Cu are arranged owing to add, so the production cost height, difficulty is applied.Chinese invention patent CN1142435 then discloses a kind of welded ceramic composite guiding-board, and the ceramic material of a kind of carbon fiber-containing of this invention development is as the compound foreplate of rolling foreplate working face.Ceramic material adopts lamination layer structure, the upper strata is a working lining, and lower floor is a weld layer, with brass with the compacting the ceramic block soldering on the copper material or cast steel material matrix of foreplate, this compound foreplate has the thermal conductivity height, anti-attrition is good, heat shock resistance toughness height, but ceramic material combines with the soldering of foreplate matrix, easily produce during ceramic layer uses and peel off, the reliability that compound foreplate uses is relatively poor, influences the performance and the steel output of milling train production efficiency, and exists the hidden danger that has an accident.
Chinese invention patent CN1706635 also discloses compound foreplate of bimetallic and preparation method thereof, and this is invented described foreplate and is made of the medium carbon steel of its matrix adopting good toughness or low-alloy steel making matrix (1) and wearing layer (2); Wearing layer adopts the high-vanadium high-speed steel material to make, and the essential element of this high-vanadium high-speed steel is: C:1.8-3.5%, V:7-12%, Cr:4-5%, Mo:2-4%, Ni:0.5-1.5%, surplus are iron.The method that the compound foreplate of bimetallic is made in this invention is to adopt casting method to be shaped matrix and wearing layer, combines thereby make matrix and high-vanadium high-speed steel composite bed form excellent metallurgical, obtains the working lining of high rigidity, high-wearing feature.Because matrix material is the medium carbon steel or the low-alloy of good toughness, guaranteed the foreplate overall flexibility, not easy fracture simultaneously.Need two to overlap independently melting unit in the compound foreplate production process of this invention preparation bimetallic, complex process, bonding layer quality is wayward.
Adopt cast-infiltration method casting alloying and wear-resisting hard particles at cast(ing) surface, be to improve cast(ing) surface hardness, improve the cheapness of cast(ing) surface wearability and effective method, Chinese invention patent CN101053898 discloses the vacuum full mold cast-infiltration method for preparing particulate reinforced metal-based composite surface material, according to design of part, foamed material is cut or directly prepares the vaporizable apperance with foaming technique, become the prefabricated section that adapts with the required wearing face shape of composite with strengthening preparation of granules, being fixed on needs the foamed material of alloying apperance surface, then model is imbedded in the dry sand, after the jolt ramming under negative pressure state casting of molten metal, therebetween by vacuumizing the negative pressure of formation, foamed plastics and gluing are taken away because of the gas that vaporization produces in casting process, simultaneously by vacuum sealing technology, improve the mold-filling capacity of molten metal, in order to molten metal in intergranular infiltration, thereby obtain thicker finer and close composite bed, make the tungsten carbide grain reinforced metal base composite surface material of preparation have higher surface quality and strengthen the body volume fraction, strengthen body distribution and excellent impact wear resistance more uniformly.This invention operation is trouble, and after strengthening the prefabricated section that preparation of granules becomes and the required wearing face shape of composite adapts, directly be fixed on when needing the foamed material of alloying apperance surface, in spray paint and drying course, easily come off, be difficult to obtain stay-in-grade casting and ooze wearing layer.
Summary of the invention
The object of the invention provides a kind of preparation method of casting and seeping foreplate of rolling mill.The present invention is in the foreplate working position, adopts casting to ooze technology, prepares a layer thickness 5～8mm, and hardness is greater than the wear-resistant alloy layer of 60HRC, and common medium carbon low alloy steel castable is adopted at the inoperative position of foreplate.Its main feature is to contain the raw material of high-carbon chromium iron, vanadium iron powder, titanium-iron powder, rare earth silicon iron powder and nickel package alumina particle, stirring earlier makes it even, and adding quantity of resin, further stir, resin is evenly distributed in alloy powder and the nickel package alumina particle, be coated in mo(U)ld face then, it applies the position corresponding to the foreplate working face.Alloy powder directly pours into casting mold with high-temperature molten steel behind resin solidification, alloy powder is under the high-temperature molten steel effect, and behind the molten steel solidification around the alloy powder, can obtain matrix is that martensite adds the small amount of residual austenite, and contains VC, TiC and M
7C
3The complex tissue of type carbide and alumina particle has high rigidity and excellent abrasive, and foreplate is increased substantially service life.
Purpose of the present invention can realize by following measure:
Foreplate adopts casting infiltration to be composited by wear-resistant alloy layer and cast steel parent;
At first high carbon ferro-chrome, vanadium iron, ferrotianium, rare earth ferrosilicon are become 200-300 orders with ball mill grinding, and stir, add 250-300 purpose nickel coated aluminium oxide powders then, wherein the high-carbon chromium iron addition is 60-70%, the vanadium iron powder addition is 10-15%, and the titanium-iron powder addition is 2-5%, and the rare earth silicon iron powder addition is 1-1.5%, the nickel coated aluminium oxide powder addition is 15-20%, and above percentage is mass percent;
Adding and the resin that above-mentioned alloy powder total mass ratio is 2.5-3.5% are further stirred then, are coated in mo(U)ld face then, and it applies position corresponding to the foreplate working face;
Alloy powder directly is that 1600～1650 ℃ of medium carbon low alloy steel molten steel pour into casting mold with temperature after the resin solidification time surpasses 30 minutes, the air cooling foreplate of unpacking then, and foreplate directly uses after sand removal, polishing.
The chemical composition percentage by weight of used medium carbon low alloy steel is as follows: 0.3-0.45C, and 0.3-0.6Si, 0.8-1.2Mn, 0.5-1.0Cr, all the other are Fe and inevitable trace impurity.
The present invention adopts casting to ooze technology with foreplate working position composite hardness height and the wear-resistant alloy layer good with matrix bond.At first, the main alloy raw material of selecting for use when wear-resistant alloy layer is oozed in the casting of foreplate working position has: high carbon ferro-chrome, vanadium iron, ferrotianium, rare earth ferrosilicon.The purpose of selecting high carbon ferro-chrome for use is to utilize chromium and carbon under the high-temperature molten steel effect, forms the high M of hardness
7C
3The type carbide helps improving the hardness of wear-resistant alloy layer, improves the wearability of wear-resistant alloy layer.In addition, part chromium is dissolved in matrix, also helps the antioxygenic property that improves foreplate.The high carbon ferro-chrome addition very little, M
7C
3Type carbide quantity very little, little to the influence that improves hardness, improves wearability, the high carbon ferro-chrome addition is too much, cause other alloy powder additions to reduce, be unfavorable for improving the combination property of wear-resistant alloy layer, when the high-carbon chromium iron addition was 60-70%, resultant effect was best.The purpose that adds vanadium iron has two aspects, at first, under the high-temperature molten steel effect, part carbon in vanadium and the high carbon ferro-chrome forms high rigidity VC, help improving wear-resistant alloy layer hardness and improve the wear-resistant alloy layer wearability, in addition, the part vanadium is dissolved in matrix, and the vanadium that is dissolved in the matrix easily impels separating out of proeutectoid carbide, reduced austenitic stability, make the part matrix be transformed into martensite, promote the alloy-layer matrix hardness to improve and the improvement of alloy-layer wearability, the vanadium iron powder addition is very few, little to the alloy-layer performance impact, addition is too much, then increases production cost, and suitable vanadium iron powder addition is 10-15%.The main purpose that adds ferrotianium is to utilize part carbon in titanium-iron powder and the high carbon ferro-chrome under the high-temperature molten steel effect, following reaction: [Ti]+[C]=TiC (s) takes place, and TiC has higher formation temperature (fusing point is 3160 ℃), and TiC can separate out as first precipitated phase in the molten steel solidification process.TiC belongs to binary gap transition metal infusible compound, has face-centered cubic NaCl type crystal structure, and lattice paprmeter is a=0.4392nm.And M
7C
3Carbide is the close-packed hexagonal lattice structure, and lattice paprmeter is a=0.2892nm, c=0.454nm.Both lattice paprmeters are close, according to Turnbull[Turnbull D, Vonnegut B.Nucleation Catalysis.Industrial and Engineering Chemistry.1952,44 (6): 1292-1298] the mismatch theory of Ti Chuing, can high melting compound become the non-spontaneous nucleation of new crystalline phase, mismatch between available two-phase lattice judges, that is:
In the formula: the mismatch between δ-two-phase lattice, α
cThe lattice distance of the low index face of-compound, α
NThe lattice distance of the low index face of-new crystalline phase.
Bramfitt[Bramfitt B L.Planar lattice disregistry theory and its application onheterogistry nuclei of metal.Metall.Trans., 1970,1 (7): 1987-1995] result of study shows, when the heterogeneous body forming core, the two-phase mismatch is the most effective less than 6% core, the two-phase mismatch is that 6%～12% core is medium effectively, and the two-phase mismatch is invalid greater than 12% core.TiC and M
7C
3Mismatch between the carbide lattice is 3.37%, and much smaller than 6%, therefore, TiC can play as M
7C
3The effect of the heterogeneous core of carbide promotes M
7C
3The refinement of carbide can improve the intensity and the toughness of alloy-layer, and improves the thermal fatigue property of alloy-layer, helps improving foreplate service life.The main purpose that adds rare earth silicon iron powder is the effect that utilizes rare earth to have refinement wearing layer solidified structure under the high-temperature molten steel effect and purify solidified structure, help improving wear-resistant alloy layer intensity and toughness, can improve the thermal fatigue property of wear-resistant alloy layer, finally can prolong the service life of foreplate.The rare earth silicon iron powder addition is too much, increases The amount of inclusions in the solidified structure on the contrary, is unfavorable for improving the solidified structure performance, and suitable rare earth silicon iron powder addition is 1-1.5%.Adding the aluminium oxide of some in alloy powder, mainly is high rigidity and the good high-temperature stability of utilizing aluminium oxide, helps obviously improving the wearability of alloy-layer.In order to guarantee that alumina particle does not peel off in using, therefore select nickel coated aluminium oxide powder for use, and addition when being 15-20% effect best.
Effect of the present invention:
1. with the foreplate of the present invention's manufacturing, production technology is easy, contains the Al of 25%～35% high rigidity carbide and about 15% in the metallographic structure of foreplate working position
2O
3Hard particles, matrix are that martensite adds a small amount of austenite, cause foreplate working position macrohardness height, reach more than the 60HRC, have good wearability.
2. the foreplate made from the present invention, High-Strength Low-Alloy cast steel is adopted at inoperative position (foreplate parent), obdurability is good, can crooked and fracture in the foreplate use, wear-resistant alloy layer and foreplate parent are firm metallurgical binding, in the use, wear-resistant alloy layer can not ftracture and peel off.
3. the foreplate made from the present invention, wearing layer thickness 5～8mm, the alloy raw material addition is few, and production cost obviously reduces than whole steel alloy casting foreplate.
4. improve 3-5 times than whole steel alloy casting foreplate the service life of foreplate of the present invention.
Description of drawings
Fig. 1 casting and seeping foreplate of rolling mill cast schematic diagram.
Label among the figure is represented respectively: 1-steam vent; 2-dead head; 3-casting mold mo(u)ld top half; 4-die cavity; 5-casting mold mo(u)ld bottom half; 6-coated alloy powder.
The specific embodiment
The present invention at first grinds to form 200-300 orders with ball mill with high carbon ferro-chrome, vanadium iron, ferrotianium and rare earth ferrosilicon, and stir, can add 250-300 purpose nickel coated aluminium oxide powders in the back, wherein the high-carbon chromium iron addition is 60-70%, vanadium iron powder addition 10-15%, titanium-iron powder addition 2-5%, rare earth silicon iron powder addition 1-1.5%, nickel coated aluminium oxide powder addition 15-20%.The resin that adds powder total amount 2.5-3.5% then further stirs, and is coated in the surface of casting mold mo(u)ld bottom half 5 then, and the coating position of coated alloy powder 6 is corresponding to the foreplate working face.Alloy powder is after the resin solidification time surpasses 30 minutes, directly be that 1600～1650 ℃ of medium carbon low alloy steel molten steel pour into die cavity 4 by dead head 2 with temperature, the main chemical composition (weight %) of steel alloy is as follows: 0.3-0.45C, 0.3-0.6Si, 0.8-1.2Mn, 0.5-1.0Cr, all the other are Fe and inevitable trace impurity, and the steam vent 1 of the gas in the casting mold in casting mold mo(u)ld top half 3 discharged.Unpacking then air cooling foreplate, foreplate does not need heat treatment directly to use after sand removal, polishing.
Embodiment 1:
At first high carbon ferro-chrome, vanadium iron, ferrotianium and rare earth ferrosilicon are ground to form 200-300 orders with ball mill, and stir, can add 250-300 purpose nickel coated aluminium oxide powders in the back, wherein the high-carbon chromium iron addition is 64.3%, vanadium iron powder addition 12.8%, titanium-iron powder addition 3.1%, rare earth silicon iron powder addition 1.2%, nickel coated aluminium oxide powder addition 18.6%.The phenolic resins that adds powder total amount 2.9% then further stirs, and is coated in the surface of casting mold mo(u)ld bottom half 5 then, and the coating position of coated alloy powder 6 is corresponding to the foreplate working face.Alloy powder is after the phenolic resin curing time surpasses 30 minutes, directly be that 1637 ℃ of medium carbon low alloy steel molten steel pour into die cavity 4 by dead head 2 with temperature, the main chemical composition (weight %) of steel alloy is as follows: 0.41C, 0.47Si, 0.95Mn, 0.88Cr all the other are Fe and inevitable trace impurity, the steam vent 1 of the gas in the casting mold in casting mold mo(u)ld top half 3 discharged.Unpacking then air cooling foreplate, foreplate does not need heat treatment directly to use after sand removal, polishing.
Embodiment 2:
At first high carbon ferro-chrome, vanadium iron, ferrotianium and rare earth ferrosilicon are ground to form 200-300 orders with ball mill, and stir, can add 250-300 purpose nickel coated aluminium oxide powders in the back, wherein the high-carbon chromium iron addition is 65.7%, vanadium iron powder addition 13.3%, titanium-iron powder addition 2.8%, rare earth silicon iron powder addition 1.3%, nickel coated aluminium oxide powder addition 16.9%.The furane resins that add powder total amount 3.2% then further stir, and are coated in the surface of casting mold mo(u)ld bottom half 5 then, and the coating position of coated alloy powder 6 is corresponding to the foreplate working face.Alloy powder is after furane resins hardening times surpassing 30 minutes, directly be that 1628 ℃ of medium carbon low alloy steel molten steel pour into die cavity 4 by dead head 2 with temperature, the main chemical composition (weight %) of steel alloy is as follows: 0.39C, 0.51Si, 1.14Mn, 0.86Cr all the other are Fe and inevitable trace impurity, the steam vent 1 of the gas in the casting mold in casting mold mo(u)ld top half 3 discharged.Unpacking then air cooling foreplate, foreplate does not need heat treatment directly to use after sand removal, polishing.
Casting and seeping foreplate of rolling mill parent of the present invention is that excellent metallurgical combines with wearing layer, and the antifriction alloy layer thickness reaches 5～8mm, contains the Al of 25%～35% high rigidity carbide and about 15% in the metallographic structure of foreplate working position
2O
3Hard particles, matrix are that martensite adds a small amount of austenite, cause foreplate working position macrohardness height, reach more than the 60HRC, have good wearability.
Foreplate of the present invention is applied on rod-rolling mill and the bar mill, can crooked and fracture in the foreplate use, wear-resistant alloy layer and matrix are firm metallurgical binding, in the use, wear-resistant alloy layer can not ftracture and peel off.Wear-resistant alloy layer also has good anti-oxidant and thermal fatigue resistance, and improve 3-5 times than whole steel alloy casting foreplate the service life of foreplate.
Foreplate production technology of the present invention is simple, does not need heat treatment, saves energy consumption, and alloy adds few, and production cost is low.Use foreplate of the present invention, can improve rolling mill production efficiency, improve the stocking surface quality, alleviate labor strength, reduce the stocking production cost, have good economic and social benefit.
Claims (2)
1, a kind of preparation method of casting and seeping foreplate of rolling mill is characterized in that:
Foreplate adopts casting infiltration to be composited by wear-resistant alloy layer and cast steel parent;
At first high carbon ferro-chrome, vanadium iron, ferrotianium, rare earth ferrosilicon are become 200-300 orders with ball mill grinding, and stir, add 250-300 purpose nickel coated aluminium oxide powders then, wherein the high-carbon chromium iron addition is 60-70%, the vanadium iron powder addition is 10-15%, and the titanium-iron powder addition is 2-5%, and the rare earth silicon iron powder addition is 1-1.5%, the nickel coated aluminium oxide powder addition is 15-20%, and above percentage is mass percent;
Adding and the resin that above-mentioned alloy powder total mass ratio is 2.5-3.5% are further stirred then, are coated in mo(U)ld face then, and it applies position corresponding to the foreplate working face;
Alloy powder directly is that 1600～1650 ℃ of medium carbon low alloy steel molten steel pour into casting mold with temperature after the resin solidification time surpasses 30 minutes, the air cooling foreplate of unpacking then, and foreplate directly uses after sand removal, polishing.
2, the preparation method of casting and seeping foreplate of rolling mill as claimed in claim 1, the chemical composition percentage by weight that it is characterized in that used medium carbon low alloy steel is as follows: 0.3-0.45C, 0.3-0.6Si, 0.8-1.2Mn, 0.5-1.0Cr, all the other are Fe and inevitable trace impurity.
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