CN1048207C - High-chrome cast iron surfacing welding material and technique - Google Patents
High-chrome cast iron surfacing welding material and technique Download PDFInfo
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- CN1048207C CN1048207C CN95110133A CN95110133A CN1048207C CN 1048207 C CN1048207 C CN 1048207C CN 95110133 A CN95110133 A CN 95110133A CN 95110133 A CN95110133 A CN 95110133A CN 1048207 C CN1048207 C CN 1048207C
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Abstract
The present invention provides high-chrome cast iron surfacing welding material and a technique thereof. The material adopts carbon and chromium whose contents are relatively low, and the elements of molybdenum and vanadium which promote the formation of ferrite are added, so the hypoeutectic high-chromium cast iron alloy of ferrite bases is formed. The present invention not only reserves high plasticity and toughness, but also has high strength and hardness. The adoption of the techniques of resurfacing welding groove construction, edge transition, etc. in the aspect of welding techniques can effectively prevent stripping and can improve abrasion resisting force, so the abrasion and the invalidation of workpieces are reduced. The present invention can be applied to high-stress abrasion and impact abrasion without thermal processing, and is relatively ideal high-chrome cast iron surfacing welding material and a technique thereof.
Description
The invention belongs to welding material and technology, be specially adapted to the rich chromium cast iron technique for overlaying.
As everyone knows, rich chromium cast iron is a kind of good high-abrasive material, and the rich chromium cast iron wear-proof technique is applied to welding field, just can produce a series of rich chromium cast iron resurfacing welding materials.With regard to the rich chromium cast iron welding material, roughly be divided into three major types at present.
The first kind is the big portion that Austenitic accounts for high chromium cast iron material.Higher phosphorus content is arranged usually, be organized as austenite, the better and less expensive of the ability of anti-low stress abrasive wear.But fragility is bigger, ftractures easily under the Thermal Cycle, and load can not withstand shocks.
Second class is but that the phosphorus content of constrictive type material is lower, and as-welded is austenite down, and toughness is better than the Austenitic material.Can be used for anti-low stress abrasive wear and oxidative wear.Its great advantage is the reinforcement of can hardening, and can be competent at heavily stressed wearing and tearing and impact wear after the reinforcement.This kind material property is good, is fit to be on active service under various conditions; But obstructed Overheating Treatment just is difficult to bring into play its inherent potential.
The 3rd class is that Mo, this material of W enhanced type are to add Alloy Elements Mo and W on the basis of one or two class materials, to improve the red hardness of material, strengthens the ability of hot conditions opposing wearing and tearing, in essence with preceding two classes and indistinction.
Above three major types has contained the existing rich chromium cast iron welding material of China.In the high chromium cast iron material that " application choice of hardened surface hardfacing alloy and welding method thereof " that update search goes out recommended, 3A1 is the class of can hardening; 3A3,3A4,3A5 are austenitic type; 3A2,3B1～4 are Mo, W enhanced type.Remain in place's blank in the rich chromium cast iron welding material of these types, promptly need not heat treatment and can be used for the material of impact wear.That in the prior art, can use impact wear must be through heat treatment; And just be difficult to use in impact wear without heat treatment.
Thinking after deliberation, is the existence form of carbide to the principal element of rich chromium cast iron performance impact.Carbide in the rich chromium cast iron be generally (Fe, Cr)
7C
8, once with two kinds of forms of eutectic.When being in hypereutectic composition, there is a large amount of primary carbides in the tissue.Increase with the primary carbide amount, opposing low stress abrasive wear ability strengthens, and this also is that the Austenitic high chromium cast iron material has the higher phosphorus content and the reason of chrome content.But on the contrary under the impact condition, because primary carbide is first precipitated phase, its nuclei growth is subjected to hindering less, organizes thicker.Under impact loading, thick carbide is easily chipping, from sur-face peeling, its matrix is on every side exposed, and double result all makes wearability descend.This is the basic reason that the Austenitic high chromium cast iron material is unsuitable for shock loading.Owing to cause the primary carbide of material fragility in crystallization process, to produce, thereby also can't solve by the mode of simple thermal treatment.
In sum, in existing high chromium cast iron material, also do not need heat treatment just to can be used for the material of heavily stressed wearing and tearing and impact wear.And also there is more drawback in existing welding procedure.Because high chromium cast iron material has very big fragility, easily cracks under welding stress.For reducing the crackle tendency, require about 500 ℃ of preheatings usually, interlayer temperature is not less than 400 ℃, and postwelding in time is incubated slow cooling.This technology has three remarkable shortcomings: the first, because the welding position rests on the condition of high temperature for a long time, the matrix carbide is grown up tendency seriously, and material fragility is increased; The second, the preheat temperature height causes productivity ratio low, wastes energy; The 3rd, large-scale workpiece is difficult to built-up welding often because of preheating condition is not enough.
The purpose of this invention is to provide a kind of new material that does not need heat treatment just to can be applicable to heavily stressed wearing and tearing and impact wear, promptly under as-welded, be the hypoeutectic high chromium cast iron material of ferrite base and supporting welding procedure.Utilize the method for built-up welding rich chromium cast iron to prevent from effectively to peel off, improve wear resistance, reduce the purpose that the wear of work was lost efficacy thereby reach.
Main contents of the present invention comprise material invention and technology invention two parts.The rich chromium cast iron resurfacing welding material mainly is based on lower carbon, evanohm, adds molybdenum, vanadium alloy element, makes it to form the hypoeutectic high-chromium cast iron alloy material of ferrite base.Its constituent content is (Wt%): C2.0～3.0, Si0.9～1.4, and Mn0.5～1.0, Cr18～25, Mo1.5～3.0, V0.5～2.0, all the other are Fe.Welding procedure is: not preheating before the weldering, postwelding do not need heat treatment; And the built-up welding groove is constructed in employing and the edge transition mode is welded.
Construct built-up welding groove welding process: promptly pre-position with built-up welding is welded into dividing plate with low carbon steel plate in advance on mother metal, and vertical and horizontal diaphragm is separated into sub-box one by one with position to be welded, and every sub-box is exactly a built-up welding groove, hardfacing alloy in the built-up welding groove.The built-up welding groove can be square, also can be circular arc, and built-up welding groove height equals the built-up welding height.
The edge transition welding process: when mother metal also is the bigger material of crack sensitivity, as high-carbon steel, grey cast-iron, white cast-iron etc., the built-up welding passage room is necessary.The concrete practice is: the edge along surface to be welded welds all zone of transformation with soft welding rod earlier, and the head and the tail weld seam of hardfacing alloy all rises and terminates on the zone of transformation, and head and the tail intersect with soft area, and directly weld in mother metal the middle part, can prevent from effectively to peel off.
The main effect of above-mentioned built-up welding groove is:
(1) jigsaw plays the skeleton function of hardfacing alloy.The bond strength of jigsaw and mother metal can guarantee that greater than the bond strength of rich chromium cast iron and mother metal hardfacing alloy forms a whole, and can bulk not come off under impacting.
(2) because the plastic deformation ability of steel plate is better than rich chromium cast iron greatly, thereby the welding concentration of plastic deformation during cooling is in jigsaw, and the welding stress that alloy is subjected to reduces greatly, and the crackle tendency reduces thereupon.Simultaneously, jigsaw also can become the obstruction of crackle expansion, plays the crack arrest effect.
(3) jigsaw plays the effect that reduces welding bead length, and single track length is reduced, and crack sensitivity decreases.
The present invention compares with current material has following characteristics:
1. in the general rich chromium cast iron resurfacing welding material, be beneficial to normal the adding such as austenite former Ni, Co etc.As the D667 welding rod of China, add 3～5%Ni, the rich chromium cast iron resurfacing welding material of Australian for another example VI-DALLOY company adds 6%Co, and the adding of these elements can improve austenite structure, increases toughness.Its shortcoming is that Ni, Co element are expensive, and addition is DeGrain after a little while.The present invention has taked other approach, changes the matrix form, adds ferrite former Mo and V in the material, and making matrix is ferrite.This ferrite solid solution more alloying elements cr, Mo and V, its microhardness can reach HV=430～480.Both keep higher plasticity and the toughness of ferritic structure, had enough intensity and hardness again;
2. all carbide are block eutectic carbide, find in the research, and when C content surpasses 3%, chrome content surpasses at 26% o'clock, occurs primary carbide in the alloy.And when containing Cr amount and be lower than 18%, carbide does not have wear-resistant skeleton function only along the growth of primary phase crystal boundary.Therefore, the present invention determines phosphorus content 2.0～3.0%, contains the Cr amount 18～25%, and is only;
3. the Mo that adds of the present invention, the red hardness that the V alloy element improves material in addition, effects such as crystal grain thinning.Through 600 ℃ of tempering, hardness does not only descend, but also has improved 1.5HRC;
4. material cost is lower.
5. utilize built-up welding high-chromium cast iron alloy of the present invention, the as-welded low stress that not only can be applicable to down weares and teares, and also can be applicable to wear and tear under heavily stressed wearing and tearing and the impact condition.Work under the impact wear condition, its abrasion-resistance and heat treatment are better than the constrictive type high chromium cast iron material, and throat thickness can reach 100mm.
Embodiment
Utilize foregoing invention, successfully built-up welding Anshan iron and steel plant sintering head factory single roll crusher.
The monodentate roller is the visual plant in the SINTERING PRODUCTION.Sintering machine pours to the good piece material of welding on the fixing grate plate from tail, and monodentate roller crushing teeth rotates between the space of grate plate, by the shearing of crushing teeth, makes the sintering deposit of bulk obtain fragmentation.In shattering process, the monodentate roller will be subjected to temperature up to comprehensive functions such as the impact of 800 ℃ red-hot sintering deposit, shearing, extruding, belongs to the abrasive wear of high temperature impact formula, and abrasion condition is very serious.Utilize welding material of the present invention and technology that the monodentate roller is carried out the built-up welding reparation.The welding material component content that uses is (wt%): C=2.5, Si=1.1, and Mn=0.9, Cr=23, Mo=2.5, V=1.5, all the other are Fe.Its welding procedure is: not preheating before the weldering, the built-up welding groove is constructed in employing and the edge transition mode is welded, not heat treatment of postwelding.Long 7 meters of the monodentate roller of repairing weighs 34 tons, is domestic second largest monodentate roller apparatus.Its crushing teeth and roll surface adopt high-abrasive material, and crushing teeth is casting high ferrochrome (carbon containing 4.5% contains chromium 28%), and wearing depth is 40～160mm, and roll surface is a high chrome, and wearing depth is 5～40mm.
Because the phosphorus content height, alloy fragility is big, and again through repeatedly impact, so the surface to be welded crackle is very serious, alloy part even just it can be hit with hand hammer in the use, and the built-up welding difficulty is very big, can't implement with traditional material and technology at all.Utilize material and process built-up welding reparation among the present invention to obtain better effects, not only full recovery size, and also increase service life.
Utilize the present invention, successively repair 4 on monodentate roller, with 26 of the matching used grate plates of monodentate roller, reach original minimum service life, reduces expenses about 5,000,000 yuan.
Claims (3)
1, a kind of rich chromium cast iron resurfacing welding material is characterized in that: it is to add molybdenum, vanadium alloy element on lower carbon, evanohm content basis, makes it to form the hypoeutectic high-chromium cast iron alloy material of ferrite base; Its constituent content is (wt%): C2.0～3.0, Si0.9～1.4, and Mn0.5～1.0, Cr18～25, Mo1.5～3.0, V0.5～2.0, all the other are Fe.
2, a kind of bead-welding technology that adopts the described rich chromium cast iron resurfacing welding material of claim 1, it is characterized in that: not preheating before the weldering, postwelding do not need heat treatment; And adopt and construct built-up welding groove welding process, promptly being combined into dividing plate with low carbon steel plate in advance with the position of built-up welding in advance at mother metal, vertical and horizontal diaphragm is separated into sub-box one by one with position to be welded, and each sub-box is exactly a built-up welding groove, hardfacing alloy in the built-up welding groove.
3, a kind of bead-welding technology that adopts the described rich chromium cast iron resurfacing welding material of claim 1, it is characterized in that: not preheating before the weldering, postwelding do not need heat treatment; And adopt the edge transition mode to weld, and promptly the edge along surface to be welded welds all zone of transformation with soft welding rod earlier, and the head and the tail weld seam of hardfacing alloy all rises and terminates on the zone of transformation, and head and the tail intersect with soft area, and mid portion directly welds in mother metal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN95110133A CN1048207C (en) | 1995-03-24 | 1995-03-24 | High-chrome cast iron surfacing welding material and technique |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN95110133A CN1048207C (en) | 1995-03-24 | 1995-03-24 | High-chrome cast iron surfacing welding material and technique |
Publications (2)
| Publication Number | Publication Date |
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| CN1116574A CN1116574A (en) | 1996-02-14 |
| CN1048207C true CN1048207C (en) | 2000-01-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN95110133A Expired - Fee Related CN1048207C (en) | 1995-03-24 | 1995-03-24 | High-chrome cast iron surfacing welding material and technique |
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Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100463762C (en) * | 2006-05-24 | 2009-02-25 | 首钢总公司 | Half steel roller submerged arc building-up flux-cored wire |
| CN101804709A (en) * | 2010-03-08 | 2010-08-18 | 安徽海螺川崎装备制造有限公司 | Wearing resistant structure of wear resistant piece and repair machining process thereof |
| BR112012023569B1 (en) * | 2010-03-19 | 2018-03-13 | Tokuden Co.,Ltd. | SUPPORT ELEMENT FOR SINTER CAKE, WELDING COATING WIRE, AND WELDING COATING METAL |
| CN102962644B (en) * | 2012-11-26 | 2015-11-25 | 遂宁华能机械有限公司 | Wear-resisting disintegrating machine thin broken roller preparation method |
| CN103481010B (en) * | 2013-09-17 | 2016-01-13 | 柳州市三龙耐磨焊接科技有限公司 | A kind of full-automatic online cold welding pattching roll squeezer technique |
| CN104690396A (en) * | 2015-01-20 | 2015-06-10 | 云南机电职业技术学院 | Grinding roller surfacing technology for high-chromium wear-resistant material |
| EP3572175A1 (en) * | 2018-05-23 | 2019-11-27 | Siemens Aktiengesellschaft | Production and repair welding of cast iron with spheroidal graphite |
| CN110567336A (en) * | 2019-09-09 | 2019-12-13 | 哈尔滨汽轮机厂有限责任公司 | Valve body inner wall surfacing size detection inner clamp and detection method |
| CN111843283A (en) * | 2020-06-05 | 2020-10-30 | 中国科学院金属研究所 | High-chromium cast iron type iron-based self-fluxing alloy powder |
| CN114131153A (en) * | 2022-01-06 | 2022-03-04 | 上海赛科利汽车模具技术应用有限公司 | Surface depression surfacing method for automobile die cast steel |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5976696A (en) * | 1982-10-26 | 1984-05-01 | Nittetsu Hard Kk | Roll for cross rolling mill having resistance to wear and thermal cracking |
| JPS60141397A (en) * | 1983-12-29 | 1985-07-26 | Kanefusa Hamono Kogyo Kk | Build-up material using heat source having high energy density as heat source |
-
1995
- 1995-03-24 CN CN95110133A patent/CN1048207C/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5976696A (en) * | 1982-10-26 | 1984-05-01 | Nittetsu Hard Kk | Roll for cross rolling mill having resistance to wear and thermal cracking |
| JPS60141397A (en) * | 1983-12-29 | 1985-07-26 | Kanefusa Hamono Kogyo Kk | Build-up material using heat source having high energy density as heat source |
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| CN1116574A (en) | 1996-02-14 |
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