CN103205650B - A kind of heat-resistant antifriction steel plate and manufacture method thereof - Google Patents
A kind of heat-resistant antifriction steel plate and manufacture method thereof Download PDFInfo
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Abstract
The invention provides a kind of heat-resistant antifriction steel plate and manufacture method thereof, the weight percent of its chemical composition is C:0.10-0.30%, Si:0.10-1.50%, Mn:0.50-2.00%, P≤0.015%, S≤0.010%, Cr:0.20-2.00%, Mo:0.10-1.50%, Ni≤1.00%, V≤0.10%, RE≤0.10%, W≤1.00%, Al:0.010-0.080%, B:0.0005-0.0040%, Ti≤0.080%, Ca:0.0010-0.0080%, N≤0.0080%, O≤0.0080%, H≤0.0004%, all the other are Fe and inevitable impurity; Its mechanical property: Brinell hardness is greater than 360HB, 500 DEG C of tensile strengths are for being greater than 1000MPa.The present invention has excellent mechanical property and wear resisting property by the steel plate that the techniques such as each composition and Quench and temper obtain, and is especially suitable for the various mechanical easy-abrasion part worked under the high temperature conditions.
Description
Technical field
The present invention relates to wear resisting steel, particularly relate to a kind of heat-resistant antifriction steel plate and manufacture method thereof; Its mechanical property: Brinell hardness is greater than 360HB, the tensile strength at 500 DEG C is greater than 1000MPa.
Background technology
It is severe especially that wear-resisting steel plate is widely used in working conditions, requires high strength, on the engineering goods such as the engineering of high-wear resistance, mining, agricultural, manufacture of cement, harbour, electric power and metallurgy.As dozer, shovel loader, excavator, wagon tremie and grab bucket, stacker-reclaimer, conveying warp architecture etc.
In recent decades, the development & application development of wear resisting steel is very fast, and what generally apply at present is dilute-alloy martensite wear resisting steel.This type wear resisting steel is mainly through increasing carbon content and adding appropriate alloying element, as chromium, molybdenum, nickel, vanadium, tungsten, cobalt, boron etc., make full use of the mechanical property that the schedule of reinforcements such as phase transformation strengthening improve wear resisting steel, it obtains martensite wear resistant steel mainly through quenching and low-temperature tempering heat treatment mode.There is certain disadvantage in this type of steel grade--and its strong hardness all declines to a great extent in high temperature environments, and then reduces wear resistance, significantly reduces the work-ing life of wear resisting steel, affects applying of wear resisting steel.
Chinese patent CN101451220 discloses a kind of low-carbon low-alloy abrasion-resistant steel, and chemical composition is: C:0.12-0.16%, Si:0.10-0.70%, Mn:0.90-1.50%, P≤0.020%, S≤0.010%, Ni:0.05-0.30%, V:0.03-0.08%, Nb:0.01-0.06%, Al:0.020-0.08%, Cr:0.20-0.70%, Mo:0.1-0.50%, Ti:0.010-0.060%, B:0.0005-0.0030%, all the other are Fe and inevitable impurity; Mechanical property: tensile strength >=1220MPa, hardness: 360-440HB, adopts quenching+low-temperaturetempering (150-250 DEG C) thermal treatment process to produce.Because it adopts low-temperaturetempering explained hereafter, this often cause steel plate under the high temperature conditions mechanical property and wear resisting property significantly reduce, and then reduce service life of equipment.
Summary of the invention
A kind of heat-resistant antifriction steel plate and manufacture method thereof are the object of the present invention is to provide, this heat-resistant antifriction steel plate is on the basis of adding appropriate alloying element, obtain the heat-resistant antifriction steel plate still at relatively high temperatures with better strong hardness and wear resistance, the widespread use under being of value to hot conditions in various engineering.
To achieve these goals, the present invention adopts following technical scheme:
A kind of heat-resistant antifriction steel plate, the weight percent of its chemical composition is: C:0.10-0.30%, Si:0.10-1.50%, Mn:0.50-2.00%, P≤0.015%, S≤0.010%, Cr:0.20-2.00%, Mo:0.10-1.50%, Ni≤1.00%, V≤0.10%, RE≤0.10%, W≤1.00%, Al:0.010-0.080%, B:0.0005-0.0040%, Ti≤0.080%, Ca:0.0010-0.0080%, N≤0.0080%, O≤0.0080%, H≤0.0004%, all the other are Fe and inevitable impurity.Its typical mechanical property: Brinell hardness is greater than 360HB, the tensile strength at 500 DEG C is greater than 1000MPa.
Above-mentioned RE represents rare earth element, is specifically selected from one or more in La, Ce, Nd.
The chemical composition effect of heat-resistant antifriction steel plate involved in the present invention is as follows:
Carbon: carbon is the most basic in wear resisting steel, most important element, can improve intensity and the hardness of steel, and then improves the wear resistance of steel, but its to the toughness of steel and welding property unfavorable, therefore, controlling carbon content in heat-resistance and wear-resistance steel of the present invention is 0.10-030wt.%, is preferably 0.12-0.30wt.%.
Silicon: silicon is solid-solubilized in ferrite and austenite the hardness and the intensity that improve them, but the too high meeting of silicone content causes the toughness of steel to decline.In addition, the high temperature resistance characteristic that silicon has, can improve steel belt roof bolt stability.Controlling silicone content in heat-resistance and wear-resistance steel of the present invention is 0.10-1.50wt.%, and preferred Si content is 0.20-1.50%.
Manganese: manganese increases the hardening capacity of steel strongly, reduces the critical cooling velocity of wear resisting steel transition temperature and steel.But when Fe content is higher, there is the tendency making grain coarsening, and increase the crisp susceptibility of steel belt roof bolt, and easily cause occurring segregation and crackle in strand, reduce the performance of steel plate, controlling Fe content in heat-resistance and wear-resistance steel of the present invention is 0.50-2.00wt.%, is preferably 0.50-1.80wt.%.
Chromium: chromium can reduce critical cooling velocity, improve the hardening capacity of steel.Chromium can form multiple carbide in steel, improves intensity and hardness.Chromium can stop when tempering or slow down precipitation and the gathering of carbide, can improve steel belt roof bolt stability, and controlling chromium content in heat-resistance and wear-resistance steel of the present invention is 0.30-2.00wt.%, is preferably 0.30-1.80wt.%.
Molybdenum: molybdenum can crystal grain thinning, improves intensity and toughness.Molybdenum is present in solid solution phase and Carbide Phases in steel, therefore, has the effect of solution strengthening and carbide dispersion-strengthened containing molybdenum steel simultaneously.Molybdenum is the element reducing temper brittleness, can improve tempering and stablize.Therefore controlling molybdenum content in heat-resistance and wear-resistance steel of the present invention is 0.10-1.50wt.%, is preferably 0.20-1.30wt.%.
Nickel: nickel can reduce critical cooling velocity, improve the hardening capacity of steel, but too high levels easily causes surface of steel plate oxide skin to be difficult to come off, and cost significantly increases, controlling nickel content in heat-resistance and wear-resistance steel of the present invention is≤1.00wt.%, is preferably≤0.80wt.%.
Vanadium: vanadium makes steel billet be unlikely to the too thick of growth at heating phase austenite crystal, in the secondary operation of rolling subsequently, the crystal grain of steel can be made to obtain further refinement, improves intensity and the toughness of steel.In addition, vanadium at high temperature has precipitation strength effect.Controlling content of vanadium in heat-resistance and wear-resistance steel of the present invention is≤0.10wt.%, and preferred content of vanadium is 0.020-0.10wt.%.
Rare earth RE: add the segregation that rare earth can reduce the element such as sulphur, phosphorus in steel, improve the shape of non-metallic inclusion, size and distribution, simultaneously can crystal grain thinning, strengthening crystal boundary, improves strong hardness and toughness.The content of rare earth is not easily too much, otherwise can produce macrosegregation, reduces slab quality and mechanical property.Therefore controlling content of rare earth in heat-resistance and wear-resistance steel of the present invention is≤0.10wt.%, is preferably≤0.080wt.%.
Tungsten: tungsten can increase steel belt roof bolt stability and heat resistance, and certain Grain refinement can be played.In addition, tungsten can form hard carbide and increase the wear resistance of steel.Control W content in heat-resistance and wear-resistance steel of the present invention within the scope of≤1.00wt.%, be preferably≤0.80wt.%.
Aluminium: aluminium can crystal grain thinning, the nitrogen in fixing steel and oxygen, alleviate the susceptibility of steel to breach, reduce or eliminate the aging phenomenon of steel, and improving the toughness of steel, in heat-resistance and wear-resistance steel of the present invention, aluminium content controls at 0.010-0.080wt.%, is preferably 0.020-0.080wt.%.
Boron: boron can increase the hardening capacity of steel but too high levels will cause hot-short phenomenon, affect welding property and the hot workability of steel, therefore need the content strictly controlling boron, controlling Boron contents in heat-resistance and wear-resistance steel of the present invention is 0.0005-0.0040wt.%, is preferably 0.0005-0.0020wt.%.
Titanium: titanium is one of carbide, forms trickle TiC particle with carbon, is distributed in crystal boundary, reach the effect of crystal grain thinning, and controlling titanium in heat-resistance and wear-resistance steel of the present invention is≤0.080wt.%, is preferably 0.005-0.060wt.%.
Calcium: add appropriate calcium in steel and can change the strip sulfide inclusion in steel into spherical CaS or (Ca, Mn) S is mingled with, the oxide compound that calcium is formed and sulfide inclusion density little, be easy to float and get rid of.Calcium also significantly reduces the segregation of sulphur at crystal boundary, and these are all of value to the quality improving cast steel, and then improves the performance of steel.Controlling calcium contents in heat-resistance and wear-resistance steel of the present invention is 0.0010-0.0080wt.%, is preferably 0.0010-0.0050wt.%.
Phosphorus and sulphur: in wear resisting steel, sulphur and phosphorus are harmful element, and their content will strictly control, and controls phosphorus content≤0.015wt.% in steel grade involved in the present invention, are preferably≤0.012wt.%; Control sulphur content≤0.010wt.%, be preferably sulphur content≤0.005wt.%.
Nitrogen, oxygen, hydrogen: oxygen too much in steel, nitrogen and hydrogen are especially very disadvantageous to weldability, impelling strength and splitting resistance to the performance of steel, reduce quality and the work-ing life of steel plate, but controlled sternly significantly to increase production cost, therefore, control nitrogen content≤0.0080wt.% in heat-resistance and wear-resistance steel of the present invention, be preferably≤0.0050wt.%; Control oxygen level≤0.0080wt.%, be preferably≤0.0050wt.%; Control hydrogen richness≤0.0004wt.%, be preferably≤0.0003wt.%.
The manufacture method of heat-resistant antifriction steel plate of the present invention, comprises the steps:
Smelt according to the proportioning of above-mentioned chemical composition, through steps such as casting, heating, rolling, Quench and temper, obtain described heat-resistant antifriction steel plate; Wherein, in described heating steps, Heating temperature is 1000-1250 DEG C, and soaking time is 2-3h; In described milling step, adopt free rolling, roll rear air cooling; In described quenching Step, quenching temperature is 800-980 DEG C, and soaking time is 60-120min; In described tempering step, tempering temperature is 400-650 DEG C, and soaking time is 30-100min.
Preferably, in heat-processed, Heating temperature is 1000-1200 DEG C; Preferred, in heat-processed, Heating temperature is 1050-1200 DEG C; For ensureing that carbon and alloying element fully spread, prevent austenite crystal from too growing up and billet surface severe oxidation, in heat-processed, most preferred Heating temperature is 1050-1150 DEG C.
Preferably, in quenching Step, quenching temperature is 820-960 DEG C; Preferred, quenching temperature is 820-950 DEG C; Most preferred, quenching temperature is 830-950 DEG C.
Preferably, in tempering step, Heating temperature is 400-630 DEG C; Preferred, in tempering step, Heating temperature is 400-620 DEG C; Most preferred, in tempering step, Heating temperature is 400-600 DEG C.
The content of carbon and alloying element and each processing parameter due to heat-resistant antifriction steel plate scientific design of the present invention, by the highly malleablized effect of alloying element and Quench and temper thermal treatment process, make this steel plate have excellent mechanical property and wear resisting property, be especially suitable for easy-abrasion part in the various mechanical means needing to work under the high temperature conditions.
The present invention compared with prior art has following features:
1. chemically composition is seen, by adopting higher C content (0.10-0.30%), the chemical composition of heat-resistant antifriction steel plate of the present invention, based on middle low-carbon and low-alloy, ensures that wear-resisting steel plate has higher hardness and wear resistance; Add the high temperature drag that appropriate Cr, Mo, V, Re and elements such as w improve steel plate, ensure that steel plate still has good strong hardness under comparatively high temps (300-600 DEG C), and then still there is excellent wear resistance at relatively high temperatures.
2., from production technique, heat-resistant antifriction steel plate of the present invention adopts quenching to increase temperature tempering process and produces, and ensures that the compounds such as alloying element V are fully separated out, and then improves steel plate strong hardness at high temperature, and then improve wear resisting property.
3., from product performance, heat-resistant antifriction steel plate of the present invention at relatively high temperatures (300-600 DEG C) has high rigidity and good wear resistance, and has good machining property; Wear-resisting steel plate of the present invention hardness after high tempering is higher, be greater than 360HB, there is good high temperature tensile properties, at 500 DEG C, tensile strength is greater than 1000MPa, this mainly higher carbon content and appropriate alloying element can improve high temperature lower steel plate resistance to tempering, keep higher strong hardness, and then ensure that there is good wear resistance
.
Heat-resistant antifriction steel plate of the present invention has obvious advantage.It controls the content of carbon and alloying element, and technique is simple, mechanical property is good, and the heat-resistance and wear-resistance steel with above-mentioned advantage is the inexorable trend of social economy and development of iron & steel industry.
Embodiment
Below in conjunction with specific embodiment, technical scheme of the present invention is described in further detail, should be clear and definite, embodiment is only that specific description of embodiments of the present invention, does not form any restriction to protection scope of the present invention.
Embodiment
The heat-resistant antifriction steel plate of following examples 1-10 and the steel plate of comparative example 1, the weight percent of its chemical composition is as shown in table 1; The manufacture method of the heat-resistant antifriction steel plate of embodiment 1-10 and the steel plate of comparative example 1 is: carried out in accordance with the following steps successively by corresponding raw materials for metallurgy: smelting → casting → heating → rolling → quenching → tempering, control the steel plate chemical element percent mass proportioning in each embodiment and comparative example 1, in heating steps, Heating temperature is 1000-1250 DEG C; In milling step, adopt free rolling, roll rear air cooling; In quenching Step, quenching temperature is 800-980 DEG C, and soaking time is 60-120min; In tempering step, tempering temperature is 400-650 DEG C, and soaking time is 30-100min; Its concrete technology parameter is as shown in table 2.
Table 1 unit: weight percent
Note: the RE in above-described embodiment 1,4,6,8,10 is the mixture of La, Ce and Nd.
Table 2
1, mechanical property test
Carry out Mechanics Performance Testing to the heat-resistant antifriction steel plate of embodiment of the present invention 1-10 and the wear-resisting steel plate of comparative example 1, its test result as shown in Table 3 and Table 4.
Table 3
Table 4
As can be seen from table 3 and table 4, the heat-resistant antifriction steel plate of embodiment of the present invention 1-10, its Brinell hardness is 380-450HB, tensile strength at 500 DEG C is 1000-1300MPa, more than illustrate that heat-resistant antifriction steel plate involved in the present invention has higher strong hardness, be obviously better than the steel plate of comparative example 1.
The content of heat-resistant antifriction steel plate scientific design of the present invention carbon and alloying element and each processing parameter, by the highly malleablized effect of alloying element and Quench and temper thermal treatment process, make this steel plate still have excellent mechanical property and wear resisting property at a higher temperature, be especially suitable for easy-abrasion part in the various mechanical means needing to work under the high temperature conditions.
Claims (17)
1. a heat-resistant antifriction steel plate, the weight percent of its chemical composition is: C:0.10-0.30%, Si:0.10-1.50%, Mn:0.50-2.00%, P≤0.015%, S≤0.010%, Cr:0.30-2.00%, Mo:0.10-1.50%, Ni≤0.80%, V:0.020-0.10%, RE≤0.08%, W≤1.00%, Al:0.010-0.080%, B:0.0005-0.0040%, Ti≤0.080%, Ca≤0.0080%, N≤0.0080%, O≤0.0080%, H≤0.0004%, all the other are Fe and inevitable impurity; Its mechanical property: Brinell hardness is greater than 360HB, 500 DEG C of tensile strengths are for being greater than 1000MPa.
2. heat-resistant antifriction steel plate as claimed in claim 1, it is characterized in that, RE is selected from one or more in La, Ce, Nd.
3. heat-resistant antifriction steel plate as claimed in claim 1 or 2, is characterized in that, C:0.12-0.30%; Si:0.20-1.50%, by weight percentage.
4. heat-resistant antifriction steel plate as claimed in claim 1 or 2, is characterized in that, Mn:0.50-1.80%; Cr:0.30-1.80%; Mo:0.20-1.30%, by weight percentage.
5. heat-resistant antifriction steel plate as claimed in claim 1, is characterized in that, W≤0.8%; Al:0.020-0.080%; B:0.0005-0.0020%, by weight percentage.
6. heat-resistant antifriction steel plate as claimed in claim 1 or 2, is characterized in that, Ti:0.005-0.060%; Ca:0.0010-0.0050%, by weight percentage.
7. heat-resistant antifriction steel plate as claimed in claim 1 or 2, is characterized in that, N≤0.0050%; O≤0.0050%; H≤0.0003%; P≤0.012%; S≤0.005%, by weight percentage.
8. the manufacture method of the heat-resistant antifriction steel plate as described in as arbitrary in claim 1-7, comprises the steps:
Smelt according to the proportioning of above-mentioned chemical composition, through casting, heating, rolling, Quench and temper step, obtain described heat-resistant antifriction steel plate; Wherein, in described heating steps, Heating temperature is 1000-1250 DEG C, and soaking time is 2-3h; In described milling step, adopt free rolling, roll rear air cooling; In described quenching Step, quenching temperature is 800-980 DEG C, and soaking time is 60-120min; In described tempering step, tempering temperature is 400-650 DEG C, and soaking time is 30-100min.
9. the manufacture method of heat-resistant antifriction steel plate as claimed in claim 8, it is characterized in that, in heating steps, Heating temperature is 1000-1200 DEG C.
10. the manufacture method of heat-resistant antifriction steel plate as claimed in claim 8, it is characterized in that, in heat-processed, Heating temperature is 1050-1200 DEG C.
The manufacture method of 11. heat-resistant antifriction steel plates as claimed in claim 8, is characterized in that, in heating steps, Heating temperature is 1050-1150 DEG C.
The manufacture method of 12. heat-resistant antifriction steel plates as claimed in claim 8, is characterized in that, in quenching Step, quenching temperature is 820-960 DEG C.
The manufacture method of 13. heat-resistant antifriction steel plates as claimed in claim 8, is characterized in that, in quenching Step, quenching temperature is 820-950 DEG C.
The manufacture method of 14. heat-resistant antifriction steel plates as claimed in claim 8, is characterized in that, in quenching Step, quenching temperature is 830-950 DEG C.
The manufacture method of 15. heat-resistant antifriction steel plates as claimed in claim 8, is characterized in that, in tempering step, Heating temperature is 400-630 DEG C.
The manufacture method of 16. heat-resistant antifriction steel plates as claimed in claim 8, is characterized in that, in tempering step, Heating temperature is 400-620 DEG C.
The manufacture method of 17. heat-resistant antifriction steel plates as claimed in claim 8, is characterized in that, in tempering step, Heating temperature is 400-600 DEG C.
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| CN201310105154.2A CN103205650B (en) | 2013-03-28 | 2013-03-28 | A kind of heat-resistant antifriction steel plate and manufacture method thereof |
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