CN1624180A - High boron foundry iron base anti-wear alloy and its heat treatment method - Google Patents
High boron foundry iron base anti-wear alloy and its heat treatment method Download PDFInfo
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Abstract
An antiwear cast high-B Fe-based alloy contains C (0.15-0.70 wt.%), B (0.3-1.9), Cr (0.3-0.8), Si (0.4-0.8), Mn (0.6-1.3), Ce (0.05-0.20), La (0.02-0.10), Ca (0.005-0.018), K (0.04-0.18), Al (0.08-0.25), S (0-0.04), P (0-0.04) and Fe (rest). Its heat treatment includes such steps as pretreating for conversion to pearlite by heating to 760-820 deg.C and cooling, quenching by heating to 960-1050 deg.C and fast cooling, and tempering by heating to 180-400 deg.C and cooling.
Description
Technical field
The present invention relates to a kind of high-abrasive material technical field, particularly relate to the hard phase of a kind of boride with hardness height, Heat stability is good as cast abrasion-resistant alloy, boride is embedded on the martensitic matrix of high tenacity, obtains to have high boron foundry iron base anti-wear alloy and heat treating method thereof than high-strong toughness and superior abrasion resistance.
Background technology
Existing metallic substance destroys three kinds of forms: promptly rupture, corrode and wear and tear.Although fret wear does not resemble other two kinds of forms, seldom cause the catastrophic harm of metal works, its financial loss that causes is quite surprising.According to statistics, by the financial loss that wearing and tearing cause, about 50,000,000,000 dollars/year of the U.S., about 30,000,000,000 mark/years of Germany.China consumes nearly 2,000,000 tons because of wearing and tearing cause ball mills every year, ball mill and various crusher liner plate consume nearly 500,000 tons, nearly 600,000 tons of roll consumption, various engineering excavation machines and shovel loader bucket tooth, various wear resistant conveying pipes road, various grinder hammerhead and jaw, various grip-pad consumption are also above 500,000 tons.In all kinds of wearing and tearing, abrasive wear occupies an important position again, in the galling total amount, account for more than 50%, wearing and tearing are many industrial sector ubiquities such as metallurgy, mine, machinery, electric power, coal, oil, traffic, military project and become a major reason that causes equipment failure or material damage, also are to cause one of maximum problem of financial loss.Therefore, the research and development abrasion resistance material to reduce galling, has important meaning to national economy.
The high-abrasive material of widespread use at present mainly contains following three major types: 1. high mangaenese steel; 2. low, interalloy wear resisting steel; 3. rich chromium cast iron; There is following weak point in they:
1. described high mangaenese steel is since 1882 come out, and the history in existing more than 100 year becomes traditional high-abrasive material, be widely used, China in 50～sixties of 20th century almost described high mangaenese steel as omnipotent high-abrasive material.Use in the practice and find that the wear resistance of described high mangaenese steel is with good conditionsi, only impacting under the situation big, that stress is high, abrasive material is hard, high mangaenese steel is just wear-resisting.And its yield strength is low, easily deformable.Therefore, replaced by other high-abrasive material gradually in a lot of fields.
2. described low, interalloy wear resisting steel adds chromium, molybdenum, nickel and other trace element and grows up based on silicon, manganese.Its alloy system is tied to the polynary composite system of chromium-manganese-silicon-molybdenum-nickel-other trace elements of complicated component by the simple single manganese of composition system, silicon system, chromium system, chromium manganese.Described low, interalloy wear resisting steel has better strength and toughness, and the wear resistance under low, the middle shock load is better than high mangaenese steel, but exists hardening capacity and the low defective of hardenability, thereby wear resistance is relatively poor.
3. contain in described its tissue of rich chromium cast iron and surpass 20% high rigidity eutectic carbides, have excellent abrasive.But it has alloying element content height, production cost height and high-temperature heat treatment is yielding and rimose is not enough.Ordinary white cast iron and low-alloy chilled cast iron carbide hardness are low, and carbide is continuous shape and distributes, and fragility is big.
At present, be that the cast abrasion-resistant alloy of main alloy element abroad has with boron:
The USSR (Union of Soviet Socialist Republics) patent No. is SU1,447,926 a kind of " the high boron alloy manufacture method of high strength and high impact toughness ", its composition is 0.2～0.5%C, 2.1～3.5%B, 0.15～0.60%Si, 0.25～0.80%Mn, 0.2～0.8%Sb, contain more antimony in this alloy composition, will significantly increase the production cost of high boron alloy, and boron content is higher, can cause boride quantity increase in the alloy structure, be unfavorable for that high boron alloy flexible improves.The USSR (Union of Soviet Socialist Republics) patent No. is SU1 again, 581,771 " a kind of high boron alloy ", it is to have high rigidity and high-wearing feature also remains with the high boron alloy that better flexible is used to cast, and its composition is 0.2～0.5%C, 2.1～3.5%B, 0.15～0.60%Si, 1.5～6.0%Mn, 1.0～4.0%Co, surplus Fe.Although this alloy has the excellent abrasive energy, add the Co of 1.0～4.0% costlinesses, the alloy production cost is increased substantially, contain more manganese, can cause retained austenite increase in the quenching structure.
The USSR (Union of Soviet Socialist Republics) patent No. is " a kind of iron-based high-boron cast alloy " of SU5058116 again, it is to be used to wear and tear and the iron-based high-boron cast alloy of friction duty, its composition is: 0.8～1.2%C, 4.0～4.5%B, 0.15～0.6%Si, 4.0～6.0%Mn, 1.0～4.0%Co, 5.0～7.0%Cr, surplus Fe.Although this alloy has the excellent abrasive energy, add the Co of 1.0～4.0% costlinesses, production cost is increased substantially, also added more Cr and Mn in addition, the alloy production cost will be increased.
Japanese Patent No. is a kind of " the high boron alloy of structure with high strength and high tenacity " of JP10219386, and its main alloy element content is: 0.03～0.24C, 0.020～0.500B, 0.005N, 0.4Ni, 0.9Cr, 0.5Mo, 0.3V, 0.3Nb, 0.3Ti and 0.1Zr.Its tensile strength reaches 510～550MPa.Because wear-resisting hard boride phase quantity is few, alloy wear-resisting is poor.
At present, being that the cast abrasion-resistant alloy of main alloy element is domestic with boron has:
Northeastern University's journal, 2004,25 (3): 247～249 Liu often rise, Cui Hongwen, " microstructure and property of High Boron Steel " of Chen Suiyuan, it has been reported with vacuum induction furnace and has prepared the high boron alloyed steel that boron is evenly distributed, and has determined the reasonable process parameter that the High Boron Steel hot rolling is shaped.The material boron content of its development is less than 1.0%, and carbon content is very low, static mechanical performance index σ
b, σ
s, δ, ψ, A
kCan reach 670MPa, 540MPa, 23%, 25% and 150J respectively.This alloy adopts pressure processing method to be shaped, complex process, and the energy consumption height, and also hardness value is very low, mainly is used as radiation shielding material, can't be used to make high-abrasive material.
Beijing Machinery Industry press 2002,510～51 Zhang Baiming chief editor's cast iron handbook, cast iron is rolled up the 2nd edition and has been reported a kind of " is the boracic white cast iron of main alloy element with boron ", its alloying constituent is 2.2～2.4%C, 0.4～0.55%B, 0.5～0.7Mo, 0.8～1.2Cu, 0.9～1.6Si, 0.5～1.2Mn.Contain more carbon and boron in this alloy, contain a lot of carbide and boride in the alloy structure, so hardness is up to 63～65HRC, wear resistance is good, but fragility is big, and toughness is low, and impelling strength only has 3.3～4.1J/cm
2, and contain expensive molybdenum and copper, production cost height in this alloy.
Summary of the invention
Purpose of the present invention is exactly in order to overcome above-mentioned weak point of the prior art, the hard phase of a kind of boride with hardness height, Heat stability is good as cast abrasion-resistant alloy is provided, boride is embedded on the martensitic matrix of high tenacity, obtains to have high boron foundry iron base anti-wear alloy and heat treating method thereof than high-strong toughness and superior abrasion resistance.
The objective of the invention is that high boron foundry iron base anti-wear alloy by a kind of design with following basic Chemical Composition and heat-treatment technology method are provided and heat treating method thereof realize; Its main chemical compositions is (weight %): 0.15～0.70C, 0.3～1.9B, 0.3～0.8Cr, 0.4～0.8Si, 0.6～1.3Mn, 0.05～0.20Ce, 0.02～0.10La, 0.005～0.018Ca, 0.04～0.18K, 0.08～0.25Al, S＜0.04, P＜0.04, all the other are Fe; The heat treating method of described high boron foundry iron base anti-wear alloy is: perlite pre-treatment, quenching and tempering.
The perlite pretreatment process of described high boron foundry iron base anti-wear alloy is 76～820 ℃ of Heating temperatures, and soaking time is pressed following formula and determined
t＝(1.2～1.8)δ+50
T in the formula---perlite pre-treatment soaking time, min; δ---thickness of workpiece, mm; Stove is chilled to less than the cold or air cooling of stove after 500 ℃.
The quenching process of described high boron foundry iron base anti-wear alloy is 960～1050 ℃ of Heating temperatures, and soaking time is pressed following formula and determined
t＝(1.1～1.5)δ+30
T in the formula---Quenching Soaking Time, min; δ---thickness of workpiece, mm;
Cooling fast subsequently, speed of cooling is not less than 5 ℃/min.
The tempering method for treating of described high boron foundry iron base anti-wear alloy is 180～400 ℃ of Heating temperatures, and soaking time is pressed following formula and determined
t＝(2.2～3.0)δ+90
In the formula, t---tempering insulation time, min; δ---thickness of workpiece, mm;
Cold or the air cooling of stove subsequently.
Described high boron foundry iron base anti-wear alloy manufacturing processed be with the batching of described main chemical compositions the stokehold be adjusted to branch qualified after, add aluminium ingot deoxidation and microalloying, then come out of the stove; Described micro-cerium lanthanum rare earth, silicocalcium, sylvite are put into casting ladle in advance, adopt the method that pours in the bag that molten metal is carried out composite inoculating subsequently and handle directly cast of back.
The present invention is a main raw material with ordinary scrap steel and ferro-boron, adopts electrosmelting.Boron is main alloy element, and the content of boron in the earth's crust accounts for 3 * 10
-4%, near the content of tungsten, molybdenum, the same with tungsten is the rich element of China, price is low and stable.Along with the continuous increase of alloying element usage quantitys in ferrous materials such as chromium, molybdenum, nickel, tungsten, vanadium, price rapidly goes up, and supply day is becoming tight, and the present invention does not contain alloying elements such as molybdenum, nickel, tungsten, vanadium, and the chromium add-on is few.Utilize the solubleness of boron in α-Fe less than 0.0004%, maxima solubility in γ-Fe also has only 0.02%, the boron major part that adds in the iron will form boride, and boride has high rigidity and good thermostability, can significantly increase the ferrous alloy wear resistance.The solid solubility of carbon in iron is more much higher than boron, only be 0.0218% in α-Fe, and in γ-Fe up to 2.11%, therefore, can realize control by regulating boron content and carbon content in the alloy to boride percent by volume and matrix carbon content, the linkage heat treatment process can make high-boron cast alloy have excellent abrasive and obdurability.For thinning solidification structure and the form and the distribution that improve boride, also added micro-cerium, lanthanum, calcium, potassium and aluminium, the wear resistance of high-boron cast alloy and obdurability are further improved.
The performance of alloy material is by the metallographic structure decision, and certain tissue depends on chemical ingredients and thermal treatment process, and chemical ingredients of the present invention is to determine like this:
Carbon: carbon is to influence high boron foundry iron base alloy rigidity and flexible principal element, when carbon content is high, easily obtains the martensitic matrix of high rigidity after the high boron foundry iron base alloy structure quench cooled, helps improving alloy wear-resisting.Carbon content is too high, can produce a large amount of brittle carbides, and be distributed on the crystal boundary more, so high boron foundry iron base alloy impelling strength is descended.Carbon content is low excessively, and matrix is difficult for obtaining full martensitic stucture, with the perlite even the ferritic structure of soft occurring, significantly reduces alloy wear-resisting.Wear resistance and toughness for taking into account the high boron foundry iron base alloy are controlled at 0.15%～0.70% with carbon content.
Boron: boron is the main alloy element in the high boron foundry iron base alloy, and domestic aboundresources is cheap and stable.The solubleness of boron in iron is very little, and the solubleness in α-Fe is less than 0.0004%, and the maxima solubility in γ-Fe also has only 0.02%, and the boron major part that adds in the iron will form boride.FeB (HV1800～2000) and Fe that boron and iron generate
2The hardness of B (HV1400～1500) is not only far above Fe
3C (HV800～900), and be higher than the carbide Cr of chromium
7C
3(HV1300～1500) replace the wear-resisting phase of alloy carbide as wear resistant alloy with the alloy boride, can obviously improve the hardness and the wear resistance of wear resistant alloy.The boron add-on is very few, and the boride quantity of high rigidity is few in the alloy structure, and alloy rigidity is low, wears no resistance.The boron add-on is too much, the boride quantity of high rigidity increases in the alloy structure, and alloy rigidity raises, and wear resistance obviously improves, but the increase of boride, cause alloy toughness to reduce significantly, and the boron too high levels, material melting difficulty, castability worsens, cost raises, and therefore, boron content is advisable with 0.3%～1.9%.
Chromium: the main effect that adds an amount of chromium in the high boron foundry iron base alloy is to utilize chromium to dissolve in matrix when high temperature austenite, improves the hardening capacity of alloy.Chromium content very little, the chromium amount of dissolving in matrix during high temperature austenite is few, alloy hardening capacity is poor, chromium content is too high, will produce the brittle chromium cpd that contains, and increases high boron foundry iron base alloy production cost, so chromium content is advisable with 0.3%～0.8%.
Silicon: silicon is non-carbide and boride forming element, the silicon that adds in the high boron foundry iron base alloy mainly is dissolved in matrix, improves matrix strength, the raising of alloy strength, can guarantee in the alloy use wear-resistant boride difficult drop-off and peel off, help improving alloy wear-resisting.The silicon add-on very little, a little less than the alloy strengthening effect, alloy wear-resisting is relatively poor.The silicon add-on is too much, will cause the matrix embrittlement, reduces alloy toughness on the contrary, and therefore suitable silicon add-on is controlled at 0.4%～0.8%.
Manganese: manganese is the element that enlarges the austenite phase region, and the main effect that the high boron foundry iron base alloy adds manganese is to improve alloy hardening capacity, also plays a part steel liquid deoxidation.The manganese add-on very little, the effect of manganese raising hardening capacity is not obvious, the manganese add-on is too many, retained austenite is too many in the quenching structure, reduces hardness of alloy on the contrary, the infringement alloy wear-resisting, and manganese too high levels, alloy graining is organized thick, easily cracks in the cast form process, therefore its content is controlled at 0.6%～1.3%.
Cerium and lanthanum: cerium and lanthanum element can also be removed H in the molten steel except that having the effect that improves as-cast structure
2, N
2With non-metallic inclusion is gone bad and removes, make inclusion character, shape and distribution obtain refinement and improvement.Oxygen effect in cerium and a lanthanum part and the steel generates rare earth oxide, and rare earth oxide has very high fusing point, La
2O
3Be 2300 ℃, Ce
2O
3It is 1640 ℃.According to Turnbull D and Vonnegut B[Turnbull D and Vonnegut B.NucleationCatalysis.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 crystallization phases, mismatch between available two-phase lattice judges, promptly
A in the formula
c---the spacing of lattice of the low index face of compound, a
N---the spacing of lattice of the low index face of new crystallization phases.The δ value is more little, and two are complementary better, the easy more non-spontaneous nucleation that becomes of compound.Ce
2O
3With δ mismatch mutually is 5.0%, and works as the two-phase mismatch less than 12%, and dystectic compound is on good terms as non-spontaneous core, promotes make the as-cast structure refinement, and mismatch to be more little by forming core, and effect is obvious more.Rare earth oxide and high temperature δ-Fe lattice have very low mismatch, have very high fusing point again simultaneously, so intensive promotes forming core, can become crystallization nuclei, make the as cast condition grain refining, also help Refinement of Microstructure by Heat Treatment, can obviously improve the obdurability and the wear resistance of alloy.Cerium and lanthanum add-on are very few, and grain refining is not obvious, and alloy property changes little, and cerium and lanthanum add-on are too much, cause molten metal middle-weight rare earths The amount of inclusions to increase, and damage the obdurability of alloy on the contrary, reduce wear resistance.Therefore cerium content is controlled at 0.05%～0.20%, lanthanum content is controlled at 0.02%～0.10%.
Calcium: calcium and oxygen have very big avidity, and the deoxidizing capacity of calcium is very strong.Calcium has remarkable effect to inclusion in the iron and steel liquation rotten, add an amount of calcium in the high boron foundry iron base alloy, can change the strip sulfide inclusion in the alloy into globular CaS or (Ca, Mn) S is mingled with, add an amount of calcium in the alloy and also significantly reduce sulphur poly-partially at crystal boundary, calcium hot-cracking resistance when reducing cast iron alloy and the alloy casting of raising high boron foundry iron base is very useful.To make that inclusion increases in the alloy but add too much calcium, it is unfavorable that high boron foundry iron base alloy flexible is improved, and suitable calcium contents is 0.005%～0.018%.
Potassium: potassium can obviously reduce the primary crystal Tc and the eutectic crystallization temperature of high boron foundry iron base alloy, help molten steel cold excessively at liquidus line and eutectic area, and the crystallization condensate depression of alloy increases, nucleation rate is increased greatly, therefore, potassium makes the primary crystal structure refinement, the trend that residual molten steel was spaced mutually when the refinement of primary crystal tissue caused eutectic reaction strengthens, and then cause the refinement of eutectic structure, help the tiny of eutectic boride, make netted eutectic boron-carbide the connecting portion of many weaknesses occur.At the weak part of eutectic boride, easily disconnect even isolation during high-temperature heat treatment, cause the alloy flexible obviously to improve.The potassium add-on very little, not obvious to alloy solidified structure influence, the metamorphosis of boride is little after the alloy thermal treatment, alloy property improves not obvious.The potassium add-on is too much, causes that The amount of inclusions increases in the alloy, and intensity and toughness are brought detrimentally affect on the contrary, takes all factors into consideration, and potassium content is controlled at 0.04%～0.18%.
Aluminium: aluminium is strong deoxidant element, oxygen level reduction in the molten metal of impelling is arranged, increase the molten metal surface tension, promote boride to reunite, aggravate the disrumpent feelings of boride net, and the AlN that remaining nitrification forms in aluminium and the metal melt, fusing point is effective nucleating agent greater than 2200 ℃, promotes the refinement of solidified structure, help improving the performance of high boron foundry iron base alloy, the aluminium add-on is too much, easily produces inclusion, the pollution metal liquation, damage high boron foundry iron base alloy toughness on the contrary, therefore aluminium content is controlled at 0.08%～0.25%.
Inevitably trace impurity is to bring in the raw material, and sulphur and phosphorus are wherein arranged, and all is harmful elements, and intensity, toughness and wear resistance in order to guarantee the high boron foundry iron base alloy are controlled at phosphorus content below 0.04%, and sulphur content is controlled at below 0.04%.
The performance of alloy material also has direct relation with thermal treatment process, and the thermal treatment of high boron foundry iron base alloy with gas furnace, electric furnace or salt bath furnace heating, its formulation foundation is:
The as-cast structure of high boron foundry iron base alloy is mainly based on non-equilibrium microstructure (ferrite, perlite and Widmannstatten structure add boride).On its lath circle, form needle-like austenite nucleus during the non-equilibrium microstructure heating easily, this needle-like nucleus can grow up soon, merge when further heating or being incubated, the new austenite crystal that forms, its size is recovered the original austenite grain size substantially, the open grain structure genetic phenomenon occurs.As cast condition high boron foundry iron base alloy is carried out a perlite pre-treatment, can eliminate non-equilibrium microstructure, original lath has not been existed, and obtain and old austenite crystal between the balanced weave perlite of no crystal orientation relation.So after reheating, needle-like austenite nucleus has just lost formation condition, and on pearlitic ferrite and carbide interface, created the condition that forms a large amount of spherical austenite nucleus, these spherical austenite nucleus then are to change by unordered mechanism, and each spherical austenite crystal nuclear does not have strict orientation relationship each other yet, thereby further heating or when insulation, just having grown up to several in old austenite crystal scope does not have strict crystal orientation relation each other thereby does not have the new equi-axed crystal of orientation relationship with old austenite crystal yet.Thereby refinement crystal grain.Therefore, cut off the heredity of old austenite crystal, key is to cut off new and old phase crystal orientation relation.This crystal orientation relation has just in time been cut off in the perlite pre-treatment, thereby has reached the effect of eliminating tissue heredity, refinement crystal grain, improved alloy toughness.The perlite pretreatment temperature of high boron foundry iron base alloy is low excessively, and the heredity of cast structure is difficult for eliminating, and the perlite pretreatment temperature is too high, increases energy consumption, reduces production efficiency.Adopt 760～820 ℃ of heating, soaking time determines by above-mentioned formula, and stove is chilled to the perlite pre-treatment of or air cooling cold less than stove after 500 ℃, can eliminate the heredity of cast structure, improves quenching structure subsequently, improves the high boron foundry iron base alloy property.
960～1050 ℃ of the quenching temperatures of high boron foundry iron base alloy, soaking time are determined by above-mentioned formula, cooling fast subsequently.Quenching temperature is lower than 960 ℃, be dissolved in carbon in the high temperature austenite and alloying element quantity very little, the high temperature austenite poor stability, be prone to the perlite and the ferritic structure of soft in the quenching structure, reduce high boron foundry iron base hardness of alloy and wear resistance, after quenching temperature surpasses 1050 ℃, the remarkable alligatoring of high temperature austenite, it is thick to cause quenched martensite to be organized, reduce the intensity and the toughness of high boron foundry iron base alloy, and after quenching temperature surpasses 1050 ℃, the carbon and the alloying element quantity that are dissolved in the high temperature austenite are many, and high temperature austenite stability increases, and have the abundant residues austenite to exist in the quenching structure, cause the high boron foundry iron base hardness of alloy to descend, wear resistance reduces.The speed of cooling of quenching after heating is too little, be prone to the perlite and the ferritic structure of soft in the quenching structure, reduce alloy wear-resisting, the high boron foundry iron base alloy is 960～1050 ℃ of heating, soaking time is determined by above-mentioned formula, to be not less than the speed cool to room temperature of 5 ℃/min, can obtain to inlay on the martensitic matrix mixed structure of high hardness wear-resisting boride subsequently.
The purpose of the temper of high boron foundry iron base alloy is to eliminate temper stress, stable tempering tissue, the comprehensive mechanical performance of raising alloy.180～400 ℃ of tempering Heating temperatures, soaking time is definite by above-mentioned formula, subsequently cold the or air cooling of stove.Tempering temperature is lower than 180 ℃, and the quenching internal stress is difficult for removing, and high boron foundry iron base alloy toughness is low.Tempering temperature is separated out a large amount of carbide after surpassing 400 ℃ in the tempered martensite, and carbide assembles and grow up, and causes the high boron foundry iron base alloy rigidity to descend, and wear resistance reduces.
Compared with prior art, the invention has the advantages that: 1. substitute hardness is lower, thermostability is relatively poor in the conventional cast wear resistant alloy carbide as wear-resisting hard phase with the boride of hardness height, Heat stability is good, increased substantially alloy wear-resisting; 2. make full use of the boron of China's abundant, adopt and reduce carbon content in the plain carbon stool to improve matrix toughness, increase substantially boron content simultaneously, form the high rigidity boride, improve its material wear ability, and increasing substantially under the prerequisite of material wear ability, reduced the Chrome metal powder add-on again significantly, do not contain valuable alloying elements such as molybdenum, nickel, tungsten, vanadium, then significantly reduce production costs, thereby have the good market competitiveness; 3. added micro-cerium, lanthanum, calcium, potassium, aluminium element, the refinement alloy structure improves the form and the distribution of boride, has obtained the mixed structure that the high tenacity martensitic matrix is inlayed the high hardness wear-resisting boride; 4. adopt common electrosmelting, alloy thermal treatment is heated with gas furnace, electric furnace or salt bath furnace, and equipment interoperability is strong, and production technique is simple; 5. has the favorable mechanical performance, its hardness 〉=58HRC, impelling strength α
k〉=12J/cm
2, fracture toughness property K
1c〉=25MPa.m
1/2, tensile strength sigma
b〉=600MPa is so the high mangaenese steel that its over-all properties is better than using always, rich chromium cast iron and low alloy steel have the high ratio of performance to price.
Embodiment
Below in conjunction with embodiment the present invention is described in further detail.
High boron foundry iron base anti-wear alloy of the present invention and heat treating method thereof have following basic Chemical Composition and heat treating method thereof.
Embodiment 1:
Present embodiment high boron foundry iron base anti-wear alloy and heat treating method thereof adopt 350 kilograms of acid medium-frequency induction furnace meltings.Adopt ordinary scrap steel, ferro-boron, ferrochrome, ferrosilicon and ferromanganese batching, use pigging up.The stokehold is adjusted to branch and adds aluminium ingot deoxidation and microalloying after qualified, then comes out of the stove.Cerium lanthanum rare earth, silicocalcium, sylvite are put into casting ladle in advance, adopt the method that pours in the bag that molten metal is carried out composite inoculating subsequently and handle, directly pour into a mould the tup of wall thickness 80mm, its alloy composition is shown in Table 1:
Table 1 high boron foundry iron base alloy composition
C B Cr Si Mn Ce La K Ca Al S P Fe
0.28 1.79 0.67 0.46 1.23 0.09 0.05 0.13 0.007 0.21 0.023 0.030 surpluses
High boron foundry iron base alloy tup is heat-treated subsequently, and high boron foundry iron base alloy tup perlite pretreatment technology is at 65KW chamber type electric resistance furnace internal heating, 815 ℃ of Heating temperatures, and soaking time 180min, stove is cold subsequently.
High boron foundry iron base alloy tup quenching processing technology is at 65KW chamber type electric resistance furnace internal heating, 975 ℃ of Heating temperatures, and soaking time 145min, the speed with 8 ℃/min is cooled to room temperature subsequently.
High boron foundry iron base alloy tup temper technology is at 65KW chamber type electric resistance furnace internal heating, 220 ℃ of Heating temperatures, and soaking time 310min, stove is chilled to room temperature subsequently.
The direct mechanical property of sampling analysis alloy from the high boron foundry iron base alloy tup, its result is as follows: hardness 58.3HRC, impelling strength 13.6J/cm
2, fracture toughness property 27.9MPa.m
1/2, tensile strength 623MPa.High boron foundry iron base alloy tup and high mangaenese steel tup are installed in thin broken building stones on the hammer mill simultaneously, the pan feeding diameter 60～100mm of hammer mill, building stones ultimate compression strength is 45～75MPa, product granularity after hammer is broken divides 5,8,10,12mm four classes, the about 300T/h of crusher output, high boron foundry iron base alloy tup of the present invention improves 4.6 times than high mangaenese steel tup work-ing life, and tup is safe in utilization, phenomenon such as occurs rupturing, peeling off.
Embodiment 2:
Present embodiment high boron foundry iron base anti-wear alloy and heat treating method thereof adopt the melting of 350 kilograms of intermediate frequency alkalescence medium-frequency induction furnaces.Adopt ordinary scrap steel, ferro-boron, ferrochrome, ferrosilicon and ferromanganese batching, with the carburetting of barren rock electrode ink.The stokehold is adjusted to branch and adds aluminium ingot deoxidation and microalloying after qualified, then comes out of the stove.Cerium lanthanum rare earth, silicocalcium, sylvite are put into casting ladle in advance, adopt the method that pours in the bag that molten metal is carried out composite inoculating subsequently and handle, directly pour into a mould the liner plate of wall thickness 60mm.Alloy composition is shown in Table 2:
Table 2 high boron foundry iron base alloy composition
C B Cr Si Mn Ce La K Ca Al S P Fe
0.60 0.49 0.75 0.66 0.91 0.18 0.08 0.17 0.011 0.15 0.018 0.025 surplus
The high boron foundry iron base alloy lining is heat-treated subsequently, and high boron foundry iron base alloy lining perlite pretreatment technology is at 65KW chamber type electric resistance furnace internal heating, 780 ℃ of Heating temperatures, soaking time 140min, air cooling after stove is chilled to 450 ℃ subsequently.
High boron foundry iron base alloy lining quenching processing technology is at the salt bath furnace internal heating, 1042 ℃ of Heating temperatures, and soaking time 100min, the speed with 5.3 ℃/min is cooled to room temperature subsequently.
High boron foundry iron base alloy lining temper technology is at 90KW chamber type electric resistance furnace internal heating, 380 ℃ of Heating temperatures, and soaking time 230min, air cooling is to room temperature subsequently.
The direct mechanical property of sampling analysis alloy from the high boron foundry iron base alloy lining, its result is as follows: hardness 58.6HRC, impelling strength 12.7J/cm
2, fracture toughness property 26.2MPa.m
1/2, tensile strength 659MPa.High boron foundry iron base alloy lining and high chrome cast iron lining plate are installed on the stabilized soil stirring equipments such as CBO-400, WCB300 simultaneously, safe in utilization, reliable, fracture never appears in the use, improve 83% than high chrome cast iron lining plate its work-ing life, production technique is simpler than high chrome cast iron lining plate, and production cost is also cheap than high chrome cast iron lining plate.
Embodiment 3:
Present embodiment high boron foundry iron base anti-wear alloy and heat treating method thereof adopt 1500 kilograms of basic electric arc furnace meltings.Adopt ordinary scrap steel, ferro-boron, ferrochrome, ferrosilicon and ferromanganese batching, with the carburetting of barren rock electrode ink.The stokehold is adjusted to branch and adds aluminium ingot deoxidation and microalloying after qualified, then comes out of the stove.Cerium lanthanum rare earth, silicocalcium, sylvite are put into casting ladle in advance, adopt the method that pours in the bag that molten metal is carried out composite inoculating subsequently and handle, directly pour into a mould the liner plate of wall thickness 120mm, its alloy composition is shown in Table 3:
Table 3 high boron foundry iron base alloy composition
C B Cr Si Mn Ce La K Ca Al S P Fe
0.45 1.21 0.58 0.56 0.77 0.12 0.03 0.07 0.016 0.09 0.028 0.031 surpluses
The high boron foundry iron base alloy lining is heat-treated subsequently, and high boron foundry iron base alloy lining perlite pretreatment technology is at 90KW bench vehicle type electrical resistance furnace internal heating, 790 ℃ of Heating temperatures, soaking time 230min, air cooling after stove is chilled to 480 ℃ subsequently.
High boron foundry iron base alloy lining quenching processing technology is at the gas-fired furnace internal heating, 1005 ℃ of Heating temperatures, and soaking time 180min, the speed with 10 ℃/min is cooled to room temperature subsequently.
High boron foundry iron base alloy lining temper technology is at 65KW chamber type electric resistance furnace internal heating, 290 ℃ of Heating temperatures, and soaking time 400min, stove is chilled to room temperature subsequently.
The direct mechanical property of sampling analysis alloy from the high boron foundry iron base alloy lining, the result is as follows: hardness 59.0HRC, impelling strength 13.1J/cm
2, fracture toughness property 26.5MPa.m
1/2, tensile strength 638MPa.High boron foundry iron base alloy lining and middle carbon chromium nickel molybdenum martensitic alloy steel liner plate grind breeze on φ 1.83m ball mill, the carbon chromium nickel molybdenum martensitic alloy steel liner plate life-span is improved 1.43 times in the high boron foundry iron base alloy lining ratio, and price is lower more than 20% than the latter, has good economic benefits.
Claims (5)
1. high boron foundry iron base anti-wear alloy, it is characterized in that: its main chemical compositions is (weight %): 0.15～0.70C, 0.3～1.9B, 0.3～0.8Cr, 0.4～0.8Si, 0.6～1.3Mn, 0.05～0.20Ce, 0.02～0.10La, 0.005～0.018Ca, 0.04～0.18K, 0.08～0.25Al, S＜0.04, P＜0.04, all the other are Fe.
2. the heat treating method of high boron foundry iron base anti-wear alloy as claimed in claim 1, it is characterized in that: its first step heat treatment step is the perlite pre-treatment, and its second step heat treatment step is to quench, and its 3rd step heat treatment step is tempering.
3. the heat treating method of high boron foundry iron base anti-wear alloy as claimed in claim 2, it is characterized in that: described perlite pretreatment process is 760～820 ℃ of Heating temperatures, soaking time is pressed following formula and is determined
t＝(1.2～1.8)δ+50
T in the formula---light body pre-treatment soaking time, min; δ---thickness of workpiece, mm;
Stove is chilled to less than the cold or air cooling of stove after 500 ℃.
4. the heat treating method of high boron foundry iron base anti-wear alloy as claimed in claim 2, it is characterized in that: described quenching process is 960～1050 ℃ of Heating temperatures, soaking time is pressed following formula and is determined
t＝(1.1～1.5)δ+30
T in the formula---Quenching Soaking Time, min; δ---thickness of workpiece, mm;
Cooling fast subsequently, speed of cooling is not less than 5 ℃/min.
5. the heat treating method of high boron foundry iron base anti-wear alloy as claimed in claim 2, it is characterized in that: described tempering method for treating is 180～400 ℃ of Heating temperatures, soaking time is pressed following formula and is determined
t＝(2.2～3.0)δ+90
In the formula, t---tempering insulation time, min; δ---thickness of workpiece, mm;
Cold or the air cooling of stove subsequently.
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