CN102703827B - Heat treatment process of wear resistant steel - Google Patents
Heat treatment process of wear resistant steel Download PDFInfo
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- CN102703827B CN102703827B CN201210020346.9A CN201210020346A CN102703827B CN 102703827 B CN102703827 B CN 102703827B CN 201210020346 A CN201210020346 A CN 201210020346A CN 102703827 B CN102703827 B CN 102703827B
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Abstract
The invention discloses a heat treatment process of wear resistant steel. The wear resistant steel comprises chemical components, by weight percent, including 0.60-0.80% of C, 7.0-9.0% of Mn, 1.10-1.30% of Si, 2.40-2.80% of Cr, 0.10-0.20% of V, 0.05-0.10% of B, 0.02-0.03% of Ti, 0.02-0.05% of N, 0.6-0.8% of Ce, the balance of Fe and unavoidable impurities. The heat treatment process includes: firstly, annealing the wear resistant steel at 780 DEG C to 820 DEG C in an annealing furnace, holding temperature for 3-5 hours before taking out the steel, and air-cooling the steel; secondly, quenching the wear resistant steel at 1060 DEG C to 820 DEG C in a quenching furnace, holding the temperature for 2-4 hours before taking the steel, performing oil hardening, and cooling the wear resistant steel to below 200 DEG; and thirdly, tempering the wear resistant steel at 530-560 DEG C in a tempering furnace, and holding the temperature for 6-8 hours before taking out the steel for air-cooling.
Description
Technical field
The present invention relates to the ferrous materials processing technique field, particularly a kind of thermal treatment process of wear resisting steel.
Background technology
Wearing and tearing are topmost modes in three kinds of failure modes of engineering component (wearing and tearing, burn into fracture), the loss that the whole world causes because of wearing and tearing every year reaches hundreds billion of dollars, therefore research wearing and tearing and continually develop the better high-abrasive material of performance and have great economic implications.At present, high-abrasive material has been summed up 3 classes: (1) Hadfield Steel, virgin state is austenite, under extraneous intense impact and high pressure stress, austenite occurs to be strengthened to martensitic transformation, top layer has very high hardness, and inside has good toughness, and good wear resistance and reliability are arranged.(2) low-alloy wear-resistant steel, by rational chemical composition proportioning and thermal treatment, can obtain preferably over-all properties, and alloying element is commonly used Cr, Mo, Ni, Nb, Mn and Si etc., usually adopts the means such as martensitic transformation, second-phase strengthening to improve wear resistance.(3) rich chromium cast iron, belong to hard brittle material, containing Cr amount high (usually being greater than 15%), by M
7c
3the type carbide improves wear resistance.In above-mentioned materials, at present will high mangaenese steel as main high-abrasive material, but under middle or small impact load, owing to take cutting abrasion as main, therefore high mangaenese steel is difficult to elicit latent faculties.And in low alloy steel owing to there is no wear-resisting hard phase or hard phase quantity very little, wear resistance is not high yet.Although high-chromium white cast iron hardness is high, wear resistance good, there is under the large and impact load of fragility the poor and high deficiency of production cost of safety in utilization.
In order to improve the wear resistance of cast material, Chinese invention patent CN1560311 discloses a kind of wearable cast steel and preparation method thereof.Wearable cast steel contains C 0.2～0.35%, Si 0.6～1.0%, Mn 0.8～1.2%, Ni 0.2～0.6%, Cr 0.6～1.2%, Mo 0.15～0.35%.Its method for making comprises smelting, casting and thermal treatment.Smelt: dissolve and put into chromium, nickel, molybdenum at 1/5～2/5 o'clock at molten steel, come out of the stove and drop into manganese, silicon in first 5～15 minutes, then drop into reductor; Thermal treatment: 910～930 ℃ of casting foundry goods normalizings, be incubated 2 hours air coolings of coming out of the stove, 860～900 ℃ of insulations of the quenching shrend of coming out of the stove after 1.5 hours, water temperature is below 30 ℃, and 210～230 ℃ of tempering, be incubated 2～2.5 hours, the air cooling of coming out of the stove.In this invention wearable cast steel, due to without wear-resisting hard phase, hardness is low, and wear resistance is poor.Chinese invention patent CN1600889 also discloses a kind of wearable cast steel in microalloy martensite and manufacture method, its chemical composition is wt%:C 0.25～0.34, Si 0.3～0.7, Mn 1.15～1.65, Cr 0.5～1.0, B 0.0005～0.005, Ti 0.01～0.06, Ce 0.01～0.045, La 0.01～0.035, Al 0.01～0.1, S≤0.035, P≤0.035, its microalloy treatment technique for first adding TiFe in 1600～1610 ℃ in smelting furnace, add in casting ladle again or inclining to molten steel and simultaneously in casting ladle, drop into RESiFe and BFe alloy.The advantage of this invention is not use the valuable alloying elements such as Mo, Ni, but reaches highly malleablized and hard malleableize purpose by microalloying, thereby manufacturing cost is lower.But also exist hardness low, the deficiency worn no resistance.
Chinese invention patent CN1385549 discloses a kind of middle carbon multi-member low alloy grinding-tolerant steel material Chemical Composition and content, wherein: C 0.38～0.45%, Si 0.90～1.30%, and Mn 1.2～2.0%, and Cr 1.0～1.7%, Mo 0.3～0.5%, V 0.1～0.2%, and B 0.001～0.003%, and Re 0.01～0.03%, S≤0.04%, P≤0.045%, all the other are Fe.Final metallographic structure is: tempered martensite+bainite+carbide+a small amount of residual austenite.This steel not only has higher hardness, and has toughness preferably, and thermal treatment process simply is easy to grasp, and manufacturing cost is lower, can be widely used in the wearing pieces such as ball grinding machine lining board, crusher toothed plate, backplate, tup.The raising of carbon content, cause hardness to increase, and wear resistance makes moderate progress, but, owing to containing expensive molybdenum element, cause production cost to increase.Russ P RU2288294-C2 also discloses a kind of casting wear-resistant steel, and its chemical constitution is 0.80～0.95%C, 0.20～0.40%Si, 8.50～10.0%Mn, 0.50～0.85%Ni, 0.10～0.30%W, 0.025～0.045%N, 0.05～0.10%V and 0.10～0.30%Mo.Owing to adding the elements such as expensive nickel, molybdenum, cause production cost to increase.
In order to improve the cast steel wear resisting property, Chinese invention patent CN100999803 discloses a kind of high boron wear-resisting casting steel, it is characterized in that chemical composition and the weight percent thereof of this high boron wear-resisting casting steel of making is: C:0.10%～0.50%; B:0.8%～5.0%; Cu:0.3%～0.6%; Mn:0.8%～2.0%; Cr:1.0%～2.5%; Si<1.5%; Ti:0.08%～0.20%; Ce:0.04%～0.12%; Mg:0.02%～0.18%; N:0.06%～0.18%; S<0.05%; P<0.05%; Surplus is Fe and inevitable trace impurity.With ferrotianium, cerium base magnesium-rare earth and nitrogenous substances, molten steel is carried out to the composite inoculating processing, cooling fast after influence of high austenizing temp, carry out subsequently low-temperaturetempering and eliminate stress.Contain more high rigidity boride in this cast steel, wear resistance is better, but matrix is martensite, and fragility is larger.Chinese invention patent CN1804091 discloses a kind of toughening method of casting high-boron wear-resistant alloy, the chemical composition that it is characterized in that casting high-boron wear-resistant alloy is: 0.3～0.35wt%C, 1～1.5wt%B, 0.6～0.8wt%Si, 0.8～1.0wt%Mn, S<0.04wt%, P<0.04wt%, all the other are Fe, Ti and inevitable impurity element, and wherein Ti is brought into by the alterant ferrotianium; Concrete preparation process is: first carry out the molten steel melting, after the molten steel melting completes and inserts the aluminium final deoxygenation, add the processing of going bad of alterant ferro-titanium, after skimming clearly, change poured into a mould, carry out malleableize thermal treatment after casting complete, the malleableize thermal treatment temp is 1020～1050 ℃, and soaking time is 2～3 hours, then quenched or normalizing, last tempering; Alterant ferro-titanium consumption meets: 0.75～1.0wt% that wherein consumption of titanium is casting high-boron wear-resistant alloy; Molten steel add boron adopt ferro-boron, ferro-boron to add when the molten steel melting or on the turn the agent ferrotianium after adding, add again.The eutectic boride of the sand mold casting high-boron wear-resistant alloy after patent is isolated shape and is distributed in matrix.The absorption merit A of 10mm * 10mm * 55mm standard impact specimen
kreach 12.5J, impelling strength strengthens.Because matrix is still martensite, fragility is still larger.
Summary of the invention
For the deficiencies in the prior art, one of purpose of the present invention is to provide a kind of thermal treatment process of wear resisting steel, and this wear resisting steel hardness is high, wear resistance, plasticity and good toughness, and cost is low.
For achieving the above object, the technical solution used in the present invention is as follows:
A kind of thermal treatment process of wear resisting steel, is characterized in that, the chemical composition of described wear resisting steel is comprised of following component in per-cent (weight): C:0.60-0.80; Mn:7.0-9.0; Si:1.10-1.30; Cr:2.40-2.80; V:0.10-0.20; B:0.05-0.10; Ti:0.02-0.03, N:0.02-0.05, Ce:0.6-0.8, surplus is Fe and inevitable impurity, described thermal treatment process comprises:
1. annealing: it is about 780 ℃ of-820 ℃ of annealing furnaces that described wear resisting steel is placed in to temperature, is incubated and comes out of the stove in 3-5 hour, then air cooling;
2. quench: it is the about quenching furnance of 1060 ℃-1080 ℃ that described wear resisting steel is placed in to temperature, and insulation, took out oil quenchinng after 2-4 hour, and wear resisting steel is cooled to below 200 ℃;
3. tempering: described wear resisting steel is placed in to the tempering stove that temperature is about 530-560 ℃, is incubated 6-8 hour and takes out air cooling.
Beneficial effect of the present invention is:
(1) the precious alloy element such as not nickeliferous, the molybdenum of wear resisting steel of the present invention, cobalt, but adopt the elements such as cheap silicon, manganese, chromium, the starting material source is abundant, low production cost, by adding B, V and tri-kinds of elements of N, can form the iron boron compound of high rigidity, the vanadium nitrogen compound, can obviously improve steel hardness and improve the steel wear resistance.
(2) wear resisting steel of the present invention is after above-mentioned thermal treatment, and can reach following mechanical property: hardness is greater than 53HRC, tensile strength sigma
b>=1000Mpa, impelling strength α
k>=20J/cm
2, fracture toughness property K
iC>=40MPa.m
1/2.
(3) wear resisting steel of the present invention is applied to the wearing and tearing field, wear resistance improves 2～3 times than high mangaenese steel, than low alloy steel, improve more than 1 times, suitable with high-chromium white cast iron, and it is large to have overcome high-chromium white cast iron fragility, easily fragmentation and the deficiency ruptured in use, and production cost reduces more than 35% than high-chromium white cast iron.
Embodiment
Embodiment mono-
A kind of thermal treatment process of wear resisting steel, the chemical composition of described wear resisting steel is comprised of following component in per-cent (weight): C:0.60; Mn:9.0; Si:1.10; Cr:2.80; V:0.10; B:0.10; Ti:0.02, N:0.05, Ce:0.6, surplus is Fe and inevitable impurity, described thermal treatment process comprises:
1. annealing: it is 780 ℃ of annealing furnaces that described wear resisting steel is placed in to temperature, is incubated 5 hours and comes out of the stove, then air cooling;
2. quench: described wear resisting steel is placed in to the quenching furnance that temperature is 1060 ℃, and insulation, took out oil quenchinng after 4 hours, and wear resisting steel is cooled to below 200 ℃;
3. tempering: described wear resisting steel is placed in to the tempering stove that temperature is 530 ℃, is incubated 8 hours and takes out air cooling.
Embodiment bis-
A kind of thermal treatment process of wear resisting steel, the chemical composition of described wear resisting steel is comprised of following component in per-cent (weight): C:0.80; Mn:7.0; Si:1.30; Cr:2.40; V:0.20; B:0.05; Ti:0.03, N:0.02, Ce:0.8, surplus is Fe and inevitable impurity, described thermal treatment process comprises:
1. annealing: it is 820 ℃ of annealing furnaces that described wear resisting steel is placed in to temperature, is incubated 3 hours and comes out of the stove, then air cooling;
2. quench: described wear resisting steel is placed in to the quenching furnance that temperature is 1080 ℃, and insulation, took out oil quenchinng after 2 hours, and wear resisting steel is cooled to below 200 ℃;
3. tempering: described wear resisting steel is placed in to the tempering stove that temperature is 560 ℃, is incubated 6 hours and takes out air cooling.
Embodiment tri-
A kind of thermal treatment process of wear resisting steel, the chemical composition of described wear resisting steel is comprised of following component in per-cent (weight): C:0.70; Mn:8.0; Si:1.20; Cr:2.60; V:0.15; B:0.08; Ti:0.025, N:0.035, Ce:0.7, surplus is Fe and inevitable impurity, described thermal treatment process comprises:
1. annealing: it is 800 ℃ of annealing furnaces that described wear resisting steel is placed in to temperature, is incubated 4 hours and comes out of the stove, then air cooling;
2. quench: described wear resisting steel is placed in to the quenching furnance that temperature is 1070 ℃, and insulation, took out oil quenchinng after 3 hours, and wear resisting steel is cooled to below 200 ℃;
3. tempering: described wear resisting steel is placed in to the tempering stove that temperature is 540 ℃, is incubated 7 hours and takes out air cooling.
Applicant's statement, the present invention illustrates detailed process equipment and process flow process of the present invention by above-described embodiment, but the present invention is not limited to above-mentioned detailed process equipment and process flow process, do not mean that the present invention must rely on above-mentioned detailed process equipment and process flow process and could implement.The person of ordinary skill in the field should understand, any improvement in the present invention, to the interpolation of the equivalence replacement of each raw material of product of the present invention and ancillary component, the selection of concrete mode etc., within all dropping on protection scope of the present invention and open scope.
Claims (1)
1. the thermal treatment process of a wear resisting steel, is characterized in that, the chemical composition of described wear resisting steel is comprised of following component in per-cent (weight): C:0.60-0.80; Mn:7.0-9.0; Si:1.10-1.30; Cr:2.40-2.80; V:0.10-0.20; B:0.05-0.10; Ti:0.02-0.03, N:0.02-0.05, Ce:0.6-0.8, surplus is Fe and inevitable impurity, this wear resisting steel is by adding B, V and tri-kinds of elements of N, the iron boron compound of formation high rigidity and vanadium nitrogen compound are to improve steel hardness and to improve the steel wear resistance, and this wear resisting steel after heat treatment has following mechanical property: hardness is greater than 53HRC, tensile strength sigma
b>=1000Mpa, impelling strength α
k>=20J/cm
2, fracture toughness property K
iC>=40MPa.m
1/2; Described thermal treatment process comprises:
1. annealing: it is 780 ℃ of-820 ℃ of annealing furnaces that described wear resisting steel is placed in to temperature, is incubated and comes out of the stove in 3-5 hour, then air cooling;
2. quench: described wear resisting steel is placed in to the quenching furnance that temperature is 1060 ℃-1080 ℃, and insulation, took out oil quenchinng after 2-4 hour, and wear resisting steel is cooled to below 200 ℃;
3. tempering: described wear resisting steel is placed in to the tempering stove that temperature is 530-560 ℃, is incubated 6-8 hour and takes out air cooling.
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| CN104451405B (en) * | 2013-09-13 | 2017-01-25 | 宝钢特钢有限公司 | Austenite wear-resistant steel with impact and wear resistance and hot rolled plate manufacturing method |
| CN103498032A (en) * | 2013-09-23 | 2014-01-08 | 无锡阳工机械制造有限公司 | Quenching process of medium carbon alloy steel |
| CN104004964B (en) * | 2014-06-13 | 2015-12-02 | 哈尔滨工业大学 | High tough high abrasion reamer tooth and heat treating method thereof |
| CN104630642A (en) * | 2015-02-06 | 2015-05-20 | 铜陵百荣新型材料铸件有限公司 | Heat-resistant and wear-resistant cast steel |
| CN106834936A (en) * | 2016-12-29 | 2017-06-13 | 兰州兰石集团有限公司 | Agricultural machinery deep soil loosing shovel abrasion resistant cast steel and its Technology for Heating Processing |
| CN108588549A (en) * | 2017-12-28 | 2018-09-28 | 天津威尔朗科技有限公司 | A kind of drag conveyor high abrasion ledge and its manufacturing method |
| CN113913600B (en) * | 2021-04-12 | 2023-06-09 | 河南北方红阳机电有限公司 | Thermal treatment process method for D50Re material penetration type shell |
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|---|---|---|---|---|
| CN101724788A (en) * | 2009-12-18 | 2010-06-09 | 北京科技大学 | High-vanadium steel wear resistant material and preparation method thereof |
| CN101787496A (en) * | 2010-01-08 | 2010-07-28 | 北京工业大学 | Wear resistant cast steel and preparation method thereof |
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| CN100532619C (en) * | 2008-04-25 | 2009-08-26 | 北京工业大学 | High-boron low-carbon abrasion resistant cast steel and heat treatment method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101724788A (en) * | 2009-12-18 | 2010-06-09 | 北京科技大学 | High-vanadium steel wear resistant material and preparation method thereof |
| CN101787496A (en) * | 2010-01-08 | 2010-07-28 | 北京工业大学 | Wear resistant cast steel and preparation method thereof |
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