CN1019913C - Wear-resistant cast iron - Google Patents
Wear-resistant cast iron Download PDFInfo
- Publication number
- CN1019913C CN1019913C CN 90101917 CN90101917A CN1019913C CN 1019913 C CN1019913 C CN 1019913C CN 90101917 CN90101917 CN 90101917 CN 90101917 A CN90101917 A CN 90101917A CN 1019913 C CN1019913 C CN 1019913C
- Authority
- CN
- China
- Prior art keywords
- cast iron
- content
- present
- wear
- carbide
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
The present invention belongs to wear resistant cast iron which is suitable for pipeline products. The present invention provides wear resistant cast iron which is composed of the following components: 3.5 to 4.0% of C, 1.0 to 1.5% of Si, 0.5 to 1.0% of Mn, 2.0 to 3.0% of Cr, 1.5 to 2.5% of Cu, 0.3 to 0.5% of B, 0.02 to 0.05% of RE, 0.03 to 0.06% of Mg, at most 0.1% of impurity P, at most of 0.06% of impurity S, and Fe as the rest. The wear resistant cast iron of the present invention has the advantages of high hardness, good wear resistance and good processablility. The product of the wear resistant cast iron can bear high-speed erosive wear of particle media with high hardness at a certain temperature. The present invention dose not contain precious metallic elements, the cost of the product is low, and the present invention can be widely used for ash conveying systems of thermal power plants and other industrial ash conveying pipelines.
Description
The present invention relates to a kind of wear-resistant cast iron alloy that is applicable to duct products.
A kind of antifriction cast iron related to the present invention is provided for Japanese kokai publication sho 56-99219 number, its chemical ingredients is C3.9～4.20%, Si1.80～2.30%, Mn0.05～1.00%, Ni1.00～2.50%, Cr0.20～1.00%, Cu0.20～1.00%, Mo0.05～1.50%, RE0.15% removes outside the impurity and is made up of Fe.It only is applicable to the roll that rolling aluminium is used, and the lubrication of separating out when being characterized in utilizing crystallization that flake graphite had is eliminated the aluminium bonding defect.This kind antifriction cast iron is selected rare metal Ni and Mo for use, and this also makes its product have higher cost, and its material hardness only has HB280～380(to be equivalent to HRc29～41).
The objective of the invention is to prepare a kind of be used to bear be with warm high hardness particle medium under the high speed erosive wear, to work, do not contain free graphite in the material, the hardness height, processability and wear resisting property are good, and the low antifriction cast iron of product cost.
The present invention has taked following measure to reach the purpose of invention.
1, select lower carbon and silicon equivalent for use:
Carbon and silicon are the strong graphited elements that promotes, select lower carbon and silicon equivalent for use, are in order to weaken the graphitizing of carbon and silicon, to avoid having in the material free carbon to separate out, improve the content of carbide in the material, strengthening the hardness and the wear resistance of material.
2, select higher chromium Cr content for use:
Chromium is to hinder graphited element, and it not only has the effect of stable and refine pearlite, and can form the M of disperse
3C and M
7C
3Type carbide (M represents the carbide generting element, and MxCy represents carbide), the microhardness of these carbide very high (HV1700～1900).Select higher Cr content for use, can improve the content of Cr carbide in the cast iron, thereby can improve intensity, hardness, wear resistance and the resistance toheat of material significantly.
3, improve cupric Cu amount:
It is intensity, toughness and forming ability in order to improve material that the present invention improves cupric Cu amount, avoids the major defects such as hot tearing, cold cracking, brittle failure of product.Cu and can with the Cr acting in conjunction, generate the high rigidity double carbide, can improve the wear resistance of material greatly.Cu is in containing Cr cast iron, and the effect that shows is the same with Ni, just can not use noble metal Ni, thereby has reduced the cost of product significantly.
4, increase the boron element:
The boron that adds trace will be had an effect, it can not reduce the performance of material, a part of boron-carbide just occurs in ledeburite, because the micro-hardness very high (HV1100～1300) of boron-carbide, and in matrix, be evenly distributed, therefore improved the wear resistance of material.
5, do not contain valuable Ni and Mo element, advantageously reduced the cost of product.
The component content of antifriction cast iron of the present invention (weight %) is:
Carbon C is 3.5～4.0, and silicon Si is 1.0～1.5, and manganese Mn is 0.5～1.0, and chromium Cr is 2.0～3.0, and copper Cu is 1.5～2.5, and boron is 0.3～0.5, and rare earth RE is 0.02～0.05, and magnesium Mg is 0.03～0.06, phosphorus P＜0.1, and S＜0.06, surplus is Fe.
Preferable content of the present invention (weight %) is:
C3.7～3.8, Si1.1～1.3, Mn0.7～0.9, Cr2.4～2.8, Cu1.8～2.2, B0.3～0.5, RE0.02～0.05, Mg0.03～0.06, P＜0.1%, S＜0.06%, surplus is Fe.
To describe the reason of the upper and lower limit of the effect of every kind of chemical ingredients and selected each component content below in detail.Institute's mandatory declaration here be that reason that each composition upper and lower limit is chosen is the effect that the effect of totally working in coordination at a kind of antifriction cast iron ingredient is produced.
When selecting the chemical ingredients of antifriction cast iron, must be according to two conditions, the one, the content of carbide, kind and shape; The 2nd, the adjustment of matrix is not contained pearlitic suitable tissue after making as cast condition or thermal treatment, and control hardening capacity.
Bear and be with warm high hardness particle medium when the high-speed dry friction erosive wear, require material that certain intensity and toughness should be arranged, very high hardness is arranged again, just have best wear resistance.Such wear-resistant material should be to inlay the material that the particle of high rigidity more forms to be only only on strong matrix, and wear-resistant phase hard point and matrix microhardness are high more, the two hardness gradient is low more, its wear resistance is just high more, this strong matrix should be needle-like perlite (it is desirable to martensite), and the high rigidity particle should be carbide particle (it is desirable to alloy double carbide MxCy particle).The present invention selects chemical ingredients in view of the above for use.
1, carbon C:
What of carbon content directly influence the content of carbide in the material, carbide content how much, directly have influence on intensity, toughness, hardness and the wear resistance of material.Carbon content is higher, and carbide the more can improve wear resistance, but the fragility increase in the big occasion use of surging force, from the toughness consideration of material, should be controlled carbon content.The hardness and the carbon content that facts have proved material are not the simple proportional relations, but a curved line relation, peak value is in eutectic composition district.For purposes of the invention, carbon content is to wear resistance and all influential principal element of toughness, but they have opposite direction again, and carbon content increases, and wear resistance improves, but toughness linearly descends.When carbon content was lower than lower limit 3.5%, the content of carbide reduced, though can improve the intensity and the toughness of material, hardness is lower, and wear resisting property is poor; When if carbon content is higher than the upper limit 4.0%, can improve the content of carbide, improve the hardness and the wear resistance of material, but intensity is low, poor toughness, when producing cast-iron pipe, produce hot tearing, cold cracking, brittle failure etc.
2, silicon Si:
Silicon is to promote graphite element strongly, increasing silicon content may impel heavv section to produce perlite, simultaneously can reduce the through hardening ability again, easily make and sneak into perlite in the martensitic stucture, thereby deterioration wear resistance, if want to improve carbide content in the material, improve hardness and wear resistance, should reduce silicon content as far as possible.If silicone content is when being lower than lower limit 1.0%, the starting material silicon content is required very low among the present invention, bring difficulty to production, and improved the cost of product; If when silicone content is higher than the upper limit 1.5%, can promote greying, produce a large amount of perlite in the material, reduced hardness and wear resistance, also reduced the intensity and the toughness of material simultaneously.
3, manganese Mn:
Manganese is one and hinders graphite element.In cast iron manganese content in and after the harmful element sulphur when having a surplus, can play the stable carbide effect, in refinement with stablize the pearlitic while, also have the effect that suppresses perlite formation.When manganese when content is higher in cast iron, form Mn
3C type carbide, in white pig iron with (FeMn)
3C type carbide pattern exists, and these carbide compare Fe
3C is stable, firm, and then improves the hardness and the wear resistance of material.In the present invention, if manganese content is when being lower than lower limit 0.5%, last deficiency during manganese removes and behind the deleterious effect of sulphur can make deoxidation insufficient, also can not show the favourable influence of manganese simultaneously; When manganese content is higher than the upper limit 1.0%, the lumpiness of carbide is increased, and distribute and also can worsen (being the successive net distribution) along crystal boundary, intensity, toughness, the wear resistance of material are reduced.
4, phosphorus P:
Phosphorus can reduce the fusing point and the eutectic temperature of cast iron, improves the flowability of molten iron, improves castability.Though phosphide can improve the hardness and the wear resistance of material, can make material produce cold shortness, and the toughness of material is sharply descended, so phosphorus generally is the harmful element in the cast iron.Upper content limit should be controlled, and is low if phosphorus content limited, and can cause the remarkable increase of product cost.The present invention requires the content of phosphorus less than 0.1%.
5, sulphur S:
Sulphur is the harmful element in the cast iron, and a spot of sulphur just can generate compound F 17-hydroxy-corticosterone eS or MnS, makes foundry goods produce dreg defect; Sulphur also can reduce the molten iron flowability; Can also slacken spheroidization, so sulphur content is few more good more, but in metal charge and fuel, all contains certain sulfur content, remove difficulty, low if content limited, can cause the remarkable increase of product cost.The present invention requires the content of sulphur less than 0.06%.
6, chromium Cr:
Chromium is to hinder graphite element, and has the effect of stable and refine pearlite.Chromium is the important element of antifriction cast iron, and it can improve intensity, hardness, wear resistance, thermotolerance and the through hardening ability of material significantly.When carbon content one timing, along with the increase of chromium content, the carbide amount also increases, and forms the M of disperse
3C and M
7C
3Carbide, the microhardness of these carbide very high (HV1700～1900), thus can improve the hardness and the wear resisting property of material greatly.In the present invention, if the content of chromium is lower than lower limit 2.0%, can not get the tissue of complete chill, have fine pearlite, then material hardness is low, wears no resistance; If chromium content is higher than the upper limit 3.0%, though the hardness height of material, wear resisting property can be good, and the poor toughness of material easily produces hot tearing, cold cracking, brittle failure etc.
7, copper Cu:
Copper can increase pearlitic content, simultaneously again can refine pearlite, so can increase intensity, toughness and the forming ability of material.Copper is in chromium cast iron contained, and is identical with the effect of nickel, can hinder perlitic transformation, effective especially to the speed of cooling of slowing down austenitic transformation, even thick and large casting also can be transformed into martensite.Copper and can with the chromium acting in conjunction, form double carbide, can improve the material wear resistance greatly.In the present invention, when content was lower than lower limit 1.5%, it is not obvious that its advantageous effect is brought into play; When content was higher than the upper limit 2.5%, though the hardness of material and toughness can further improve, hardness decreased.
8, boron:
Add boron in the cast iron, matrix changes hardly, just occurs a part of boron-carbide in ledeburite, the microhardness of this carbide very high (HV1100～1300), and in matrix, be evenly distributed, can improve the wear resistance of material.In cast iron, add a spot of boron and just can have an effect, be not subjected to the restriction of casting section thickness and composition.Along with the increase of boron-containing quantity, boron-carbide content increases thereupon in the material, helps improving wear resisting property.In order to give full play to the wear resisting property of boron-carbide, content can not be lower than lower limit 0.3% in the present invention; But if when being higher than the upper limit 0.5% of content, the toughness of material significantly reduces.
9, rare earth magnesium ferrosilicon alloy:
The contained rare earth of the rare earth alloy that the present invention uses is light rare earths, (contains 45～53%CeO with cerium
2), neodymium (contains 24～29%Nd
2O
3), lanthanum (contains 11～17%La
2O
3), praseodymium (contains 5.2～7.6%Pr
6O
11) be main.Rare earth alloy can make spheroidization of graphite after adding molten iron, and can desulfurization, deoxidation, degasification, purifying molten iron improves castability, reduces casting flaws such as subsurface porosity, slag inclusion and shrinkage porosite.Also has the anti-spheroidization of eliminating interference element.The adding of rare earth alloy element can evenly be scattered the MxCy carbide refinement, thereby improves the wear resistance and the toughness of material.When the content of rare earth alloy element is lower than lower limit (RE is lower than 0.02%, and Mg is lower than 0.03%), can not give full play to the advantageous effect that the rare earth alloy element carries out spheroidizing; If RE content is higher than the upper limit 0.05%, when Mg content is higher than the upper limit 0.06%, material toughness is reduced.
Antifriction cast iron of the present invention can adopt the three-phawse arc furnace melting, also can adopt the line frequency coreless induction furnace melting.Be that example illustrates manufacture method of the present invention to adopt three-phawse arc furnace below:
1, smelting condition:
The widely different rotation mechanism of electric furnace, electrical equipment, hydraulic efficiency system, water cooling plant must satisfy working conditions, and the furnace lining geometrical dimension meets the requirement of normally deteriorating, and hot metal ladle is rotated flexibly.
2, batching and shove charge:
Batching title, content ratio (weight %), specification and standard see Table one:
Table one
Batching steel-making casting ferrochrome copper coin ferro-boron
The title pig iron pig iron
Content 50 50 525
Add
PO8 Z14 Cr4 B101
Specification or or or Cu-4 or
P10 Z18 Cr5 B102
GB717 GB718 YB64 YB466 YB65
Standard-75-82-76-64-60
Furnace bottom pack into earlier account for furnace charge total amount 20% play stove piece (pig iron), playing pack into successively on the stove piece high-meltiing alloy and a small amount of furnace charge then.
3, send electric smelting.
4, physico-chemical analysis is carried out in sampling, adjusts chemical composition content with alloying element and is controlled in the tolerance zone.
5, tap a blast furnace:
After chemical composition content was qualified, slag making heated up, and skimmed when molten iron reaches 1450～1480 ℃ and tapped a blast furnace, and carried out inoculation with 0.5% ferrosilicon powder (specification is Si75, and standard is YB58-69) that accounts for the water inventory that taps a blast furnace when tapping a blast furnace; With 1.5% the RE-Mg-ferrosilicon alloy (specification Xt-Mg5-8, standard YB65-60) that accounts for the water inventory that taps a blast furnace, adopt ladle bottom pouring process to carry out spheroidizing.
6, cast:
Molten iron after treatment, after fully stirring, after static a little the skimming, when temperature cast during at 1350-1380 ℃, an iron clad water is poured into a mould in 15 minutes and is finished.
Antifriction cast iron hardness height of the present invention, wear-resisting and processability is good.Mainly be applicable to and bear all size that band is warm, the high hardness particle medium is worked, the complicated pipeline of model under the high speed erosive wear, be specially adapted to adopt drawbench specific equipment, continuous casting moulding straight pipeline.Because the present invention has improved chromium, copper content, added boron, a large amount of chromium carbides, boron-carbide and chromium, copper double carbide have been generated thus, material almost is full carbide tissue, therefore have very high hardness and wear resistance, do not contain the condition of Ni and Mo noble element fully so possessed in the material, thereby greatly reduce the cost of product.The mechanical property of antifriction cast iron of the present invention is: the hardness HRc that utilizes universal method to record is 50～55, bending strength б
Bb〉=392N/mm
2; Impact value (non-notch sample) a
kBe 2.0～2.5J(N.M/cm
2); Recording abrasion loss with ad hoc approach (concrete grammar will be set forth in the back) is 0.0007～0.0009 gram/12 hours, and its fastness to rubbing is 4 times of plain cast iron, 6 times of general carbon steel.The metallographic structure of this antifriction cast iron is: eutectic ledeburite+needle-strip shaped cementite+dendrite perlite+a small amount of martensite.The present invention can be widely used in heat power plant's ash-transmission system and other transport pipe of industry.
Wearing test of the present invention adopts following method:
Testing installation is a MM-200 wearing and tearing sample machine.Two on employing standard wearing and tearing sample, it has the right cylinder of φ 16+0.19mm through hole for the center, and the cylinder external diameter is φ 40 ± 0.005mm, and the cylinder height is 10 ± 0.005mm, and the smooth finish of column side wall is
8.Last sample is a bistrique, and material is GCr15, and following sample is an antifriction cast iron of the present invention.Two samples, will be gone up sample and fix during test mill up and down, and following sample rotates with 200 rev/mins speed, and the pressure load between two samples is 50kg, test period 12 hours; Lubricating fluid adopts 20
#Machine oil adds the method (5kg20 of MgO abrasive material
#Machine oil adds 30gMgO); Give and grinding half an hour, loading 30kg when giving mill.
The invention will be further described for embodiment below adopting.The embodiment of antifriction cast iron of the present invention and performance are stated with table two.
Claims (2)
1, a kind of antifriction cast iron that is applicable to pipeline is characterized in that by C 3.5～4.0%, Si 1.0～1.5%, and Mn 0.5～1.0%, Cr 2.0～3.0%, and Cu 1.5～2.5%, and B 0.3～0.5%, and RE 0.02～0.05%, Mg 0.03～0.06%, P＜0.1%, and S＜0.06%, surplus is formed by Fe.
2, antifriction cast iron according to claim 1 is characterized in that preferable content is C3.7～3.8%, Si1.1～1.3%, Mn0.7～0.9%, Cr2.4～2.8%, Cu1.8～2.2%, B0.3～0.5%, RE0.02～0.05%, Mg0.03～0.06%, P＜0.1%, S＜0.06%, surplus is Fe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 90101917 CN1019913C (en) | 1990-04-09 | 1990-04-09 | Wear-resistant cast iron |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 90101917 CN1019913C (en) | 1990-04-09 | 1990-04-09 | Wear-resistant cast iron |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1055562A CN1055562A (en) | 1991-10-23 |
| CN1019913C true CN1019913C (en) | 1993-02-17 |
Family
ID=4877306
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 90101917 Expired - Fee Related CN1019913C (en) | 1990-04-09 | 1990-04-09 | Wear-resistant cast iron |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1019913C (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103014481A (en) * | 2012-12-10 | 2013-04-03 | 马鞍山市恒达耐磨材料有限责任公司 | Multielement low alloy bainite spheroidal graphite cast iron grinding ball and manufacturing method thereof |
| CN104178696A (en) * | 2014-07-28 | 2014-12-03 | 宁国市南方耐磨材料有限公司 | Graphite spheroidizing wear-resistant ball |
| CN104593661A (en) * | 2014-12-29 | 2015-05-06 | 芜湖国鼎机械制造有限公司 | Large cross-section nodular cast iron as well as cast and preparation method thereof |
| CN112091180A (en) * | 2020-08-27 | 2020-12-18 | 宁国市四方精工机械有限公司 | Manufacturing method of high-strength main steam valve |
-
1990
- 1990-04-09 CN CN 90101917 patent/CN1019913C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1055562A (en) | 1991-10-23 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JPS60247036A (en) | Cv-cast iron cylinder liner | |
| JP3779370B2 (en) | Cast iron and piston rings | |
| CN1775983A (en) | High-strength casted air-colled bainite wear-resisting steel and preparing method | |
| CN1332264A (en) | Antiwear cast alloy material with high sulfur content and several compoiste self-lubricating phases | |
| CN1044131A (en) | Chrome-molybdenum-vanadium heat-resistant and abrasion-resistant cast iron | |
| CN1055507C (en) | High ductility high chromium abrasion-resistant ball for ball grinder and its manufacturing method | |
| JPH06221436A (en) | Cast steel piston ring material | |
| CN114717467A (en) | Hypereutectic high-chromium cast iron material, preparation method and application thereof | |
| CN1080327A (en) | Low-alloyed ball mill wearing liner plate and manufacturing process | |
| CN104451397A (en) | Precision alloy for piston ring in piston type internal combustion engine and manufacturing method of precision alloy | |
| CN1039975C (en) | Cast iron lining plate of ball mill and its producing method | |
| CN101736191A (en) | Insert material for heat-resisting ductile iron stamping die | |
| CN1019913C (en) | Wear-resistant cast iron | |
| Bedolla-Jacuinde | Niobium in cast irons | |
| CN1019914C (en) | Wear-resistant cast iron | |
| CN109609835B (en) | High-toughness wear-resistant nodular cast iron and preparation process and application thereof | |
| RU2318903C1 (en) | Vermicular graphite-containing cast iron | |
| JP3218625B2 (en) | Scuff and wear-resistant sliding parts | |
| CN1088271A (en) | High temperature wear resistant alloy and manufacturing technology thereof | |
| Turakulov et al. | New concept of cast iron melting technology in induction crucible furnace | |
| RU2149914C1 (en) | Cast iron | |
| CN1804088A (en) | Manganese chromium boron rare earth composite anti-wear cast iron and preparation process thereof | |
| Wenbang et al. | Design and control of chemical compositions for high-performance austempered ductile iron. | |
| Cheng et al. | Microstructure evolution and Wear resistance of Boron-Bearing HigH speed steel roll | |
| US4929416A (en) | Cast steel |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |