CN108118245A - A kind of wear resistant toothed plate new low-alloy wear-resistant steel and its heat treatment method - Google Patents
A kind of wear resistant toothed plate new low-alloy wear-resistant steel and its heat treatment method Download PDFInfo
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- CN108118245A CN108118245A CN201711415725.7A CN201711415725A CN108118245A CN 108118245 A CN108118245 A CN 108118245A CN 201711415725 A CN201711415725 A CN 201711415725A CN 108118245 A CN108118245 A CN 108118245A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
- C22C33/06—Making ferrous alloys by melting using master alloys
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/005—Ferrous alloys, e.g. steel alloys containing rare earths, i.e. Sc, Y, Lanthanides
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
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Abstract
The present invention provides a kind of wear resistant toothed plate new low-alloy wear-resistant steel and its heat treatment method, which is made of by mass percentage following chemical composition：C：0.4‑0.5%、Si：0.10‑0.20%、Mn：0.8‑0.9%、Cr：1.7‑2.0%、Mo：0.15‑0.20%、Ni：0.7‑0.8%、P：≤0.04%、S：≤0.04%、Re：0.05 0.07%, surplus is Fe and inevitable impurity element；Heat treatment method is as follows（1）Quenching, by the shove charge under less than 100 DEG C furnace temperature of the tooth plate low-alloy wear-resistant steel under above-mentioned as cast condition, be warming up to 860 DEG C 920 DEG C with the heating rate for being not more than 100 DEG C/h and keep the temperature 2h, after oil quenching；（2）Tempering, by tooth plate low-alloy wear-resistant steel shove charge under normal temperature state after quenching, be warming up to 200 DEG C 250 DEG C with the heating rate for being not more than 100 DEG C/h and keep the temperature 3h, after come out of the stove it is air-cooled.Low-alloy wear-resistant steel of the present invention has high rigidity, good toughness and excellent wearability, can be widely applied to require on the engineering goods such as high intensity, the engineering of high-wear resistance, mining, coal chemical industry.
Description
Technical field
The present invention relates to a kind of kibbler roll wear resistant toothed plate low-alloy wear-resistant steel and its heat treatment methods, belong to metal material
Field.
Background technology
Double-geared roller crusher is a kind of widely applied crushing mechanism in coal plant of China, and the principle of this crusher in crushing is main
It is that material is crushed using the shearing of crushing teeth, squeezing action by two roller two pairs of rollers.Its advantages of be it is simple in structure,
Power consumption is small, reliable operation；The roll surface of double-roll crusher has higher wearability and recoverability, may insure two pairs of rollers gap
Stability at work.Since material squeezes by two rollers, shearing-crushing, therefore have to the moisture content of material wider suitable
With scope, its main feature is that reduction ratio is little, when work, which has, to be vibrated and requires the uniform of material.
Tooth plate crushes material as the main vulnerable part of roll crushing equipment by pressing materials in use,
It is subject to the abrasive wear that material is strong, tooth plate wear-resistant material wears no resistance, and on the one hand can cause the consumption of wear-resistant material and increase, separately
On the one hand it can cause continually to shut down replacement wear-resistant material, cause the increase of enterprise's production cost and the reduction of production efficiency, increase
Add operation person's labor intensity and burden.
At present, potassium steel is a kind of most widely used wear-resistant material, and the most important feature of potassium steel is rushed in strong
It hits under extruding condition, processing hardening occurs rapidly for surface, its center portion is made to keep the same of the good toughness of austenite and plasticity
When hardened layer have good wear-resisting property.So potassium steel is only just showed possessing to be enough to be formed under conditions of processing hardening
Go out its superior wear-resisting property, but the service life is shorter in use.Content in potassium steel due to manganese is high, and not only waste is a large amount of
Ground resource, and manganese adds steel belt roof bolt brittleness, is reduced so as to cause steel impact flexibility.There are some working condition impact forces
It is not very big, but needs very high wear-resisting property, and the wear-resisting property of potassium steel is poor, this just needs to research and develop some new materials
To replace traditional wear-resistant material.New low-alloy steel abrasion-resistant stee due to higher hardness and sufficiently ductile comprehensive performance,
And by adjusting ingredient and heat treatment process, in the Proper Match of interior control hardness and toughness in a big way, roll-type can be met
The needs of crushing plant difference wear working condition, thus oneself causes the extensive attention of people as wear-resistant material, but it is existing low
Alloy abrasion resistant steel cannot answer pair roller type due to the existing defects in the selection of metal component, content and heat treatment process mode
A variety of abrasion conditions when crusher works, cause serious wear in use.
The content of the invention
It is an object of the invention to provide a kind of wear resistant toothed plate new low-alloy wear-resistant steels and its heat treatment method, can solve
The problems such as tooth plate serious wear of kibbler roll.
The purpose of the present invention is what is realized by the following manner：
A kind of new low-alloy wear-resistant steel of wear resistant toothed plate, is made of by mass percentage following chemical composition：C：0.4-0.5%、
Si：0.10-0.20%、Mn：0.8-0.9%、Cr：1.7-2.0%、Mo：0.15-0.20%、Ni：0.7-0.8%、P：≤0.04%、S：
≤0.04%、Re：0.05-0.07%, surplus are Fe and inevitable impurity element.
The Re is No.1 rare earth alloy.
A kind of wear resistant toothed plate of the present invention is designed with the chemical composition and mass percentage content of new low-alloy wear-resistant steel
Principle is as follows：
Carbon (C)：Carbon is element important in low-alloy cast steel, and the hardness and strength of steel are main related with carbon amounts.Therefore C is to steel
Hardness, wearability, strong Firmware generate large effect, and with the increase of carbon amounts, the hardness and strength of material increase, but plasticity and toughness
It reduces;But C content is too low, and the hardenability of steel is again poor, and wearability is low.Carbon should should be contained on the premise of intensity, hardness is met
Amount control is within the specific limits.Under the conditions of relatively low shock loading, carbon or high-carbon in should selecting;Compared with Strong Impact Loading condition
Under, low-carbon should be selected, keeps higher toughness, unlikely fracture.For these reasons, tooth plate low-alloy wear-resistant steel of the invention
Carbon content wt. (C) between 0.4-0.5%.
Silicon (Si), manganese（Mn）, chromium（Cr）, nickel（Ni）：It is demonstrated experimentally that alloying element is dissolved in ferrite, due to iron
Lattice types are different with atomic radius and cause distortion of lattice；In addition alloying element is easy to be distributed near dislocation line, causes Ke
Family name's air mass reduces the movability of dislocation, so as to improve flow drag, generates solid solution strengthening effect.Work as Si<0.6%、Mn<1.5%
When, ferritic hardness and strength are significantly improved, the influence of silicon, manganese to toughness is little, the two elements of chromium, nickel, appropriate
In the range of（Cr<2%, Ni<5%）, ferritic hardness and strength are not only improved, and its toughness can be improved.In alloy structure
In steel, in order to obtain it is good strengthen as a result, the alloying elements such as silicon, manganese, chromium, nickel will be controlled certain content range it
It is interior.For these reasons, the carbon content wt. (Si) of tooth plate low-alloy wear-resistant steel of the invention) between 0.1-0.2%, wt.
(Mn)) between 0.8-0.9%, wt. (Cr)) between 1.7-2.0%, wt. (Ni)) between 0.7-0.8%.
Molybdenum (Mo)：The quenching degree of steel is significantly improved, reduces temper brittleness, improves the resistance for delayed fracture of steel.If Mo
Content is less than 0.05wt.%, then is difficult to function as described above, if Mo contents are more than 0.3wt.%, then effect reaches saturation,
And cost is higher.Therefore, the effect of comprehensive molybdenum, tooth plate of the invention are with molybdenum content wt. (Mo) scope of low-alloy wear-resistant steel
0.15-0.20%。
Rare earth element (Re), using No. 1 rare earth alloy：Strong deoxidier and desulfurizing agent, micro rare earth can improve steel
As-cast structure tissue, cleaning molten steel, crystal grain thinning increase the consistency of steel, improve form and the distribution of steel inclusion, reduce
The content of gas and objectionable impurities in steel, excessively high can become instead of steel Rare-Earth Content are mingled with, optimal RE residual contents and steel
Middle sulfur content is related.Rare earth element content wt. (Re) scope of the tooth plate low-alloy wear-resistant steel of the present invention is 0.05%-
0.07%。
Invention additionally discloses a kind of heat treatment methods of above-mentioned tooth plate low-alloy wear-resistant steel, include the following steps：
1) quench, by the shove charge under less than 100 DEG C furnace temperature of the tooth plate low-alloy wear-resistant steel under above-mentioned as cast condition, to be not more than 100
DEG C/heating rate of h is warming up to 860 DEG C -920 DEG C and keeps the temperature 2h, after oil quenching;
2) it is tempered, it is fast to be not more than the heating of 100 DEG C/h by tooth plate low-alloy wear-resistant steel shove charge under normal temperature state after quenching
Degree is warming up to 200 DEG C -250 DEG C and keeps the temperature 3h, after come out of the stove it is air-cooled.
The principle of present invention process is as follows：
1）Current most widely used quenching medium is water and oil.Water has stronger cooling capacity, as austenite
The smaller carbon steel quenching of stability, water cooling medium are the most suitable.The cooling capacity of oil is smaller than water, therefore, is made in production with oil
Medium is cooled down, is only applicable to the larger steel alloy quenching of overcooling austenite stability.The tooth plate low-alloy wear-resistant steel of the present invention
For Cr-Mn-Ni-Mo series low-alloy steel, so quenching oil is selected to make cooling medium.
2）Quenching is to improve the conventional process of material hardness, and the tissue of hardened steel is mainly that martensite or martensite add remnants
Austenite.Martensite and retained austenite are all metastable phase at room temperature, and carbon content is in hypersaturated state in martensite, remaining
Austenite is in supercooled state, their all oriented ferrites add the stable state of cementite (carbide) to convert trend, but this
Conversion is kinetically needing certain temperature and time condition, therefore quenched steel component must be tempered immediately, to eliminate or reduce
Internal stress is prevented from deforming and cracked, and obtains the performance of stable tissue and needs.
3）In certain tempering range, as temperature raises, tensile strength reduces but yield strength increases,
It is the precipitation humidification being precipitated due to carbide particle to trace it to its cause, and counteracts solution strengthening caused by lonneal and declines
Reply with dislocation substructure softens.With the further rise of temperature, dislocation strengthening and solid solution strengthening effect weaken, group
It is detailed to knit softening, the hardness of steel is caused constantly to decline.
4）According to 880 DEG C of oil quenchings and 250 DEG C of tempering heat treatment process, tempering comes out of the stove and carries out water cooling, oil cooling, air-cooled respectively,
Obtained hardness, ballistic work such as table 1.
The mechanical property that friction speed cools down after table 1 is tempered
As can be seen from Table 1, hardness number after experiment material is air-cooled is lower slightly for HRC51, but toughness index is relatively slightly higher, tool
Body is ballistic work (Akv)：21J compares the mechanical property after oil cooling and water cooling, it can be seen that properties relatively, change
Amplitude is little.From the point of view of Comprehensive Correlation, it is air-cooled after material have preferable comprehensive mechanical property, and implementation process it is easy to operate and
It is relatively low to be heat-treated cost.So the tempering type of cooling of the tooth plate low-alloy wear-resistant steel of the present invention is air-cooled.
5）The tooth plate low-alloy wear-resistant steel obtained using currently preferred chemical composition, is heat-treated through the above method
Afterwards, the tempered structure obtained is mainly tempered martensite, and hardness number reaches 50-53HRC, and impact flexibility (Akv) reaches 21J, tool
There is good comprehensive mechanical property, and have good wearability, meet requirement of the tooth plate in kibbler roll.
The beneficial effects of the invention are as follows：Configuration and processing method of the present invention by materials chemistry component, realize tooth plate
There is high rigidity, good toughness and excellent wearability with low-alloy wear-resistant steel, can be widely applied to require high intensity, height resistance to
It grinds on the engineering goods such as engineering, mining, the coal chemical industry of performance.
Description of the drawings
Fig. 1 is wear resistant toothed plate of the present invention with being shown under air-cooled 100 times of new 910 DEG C of low-alloy wear-resistant steel, 250 DEG C of oil quenching tempering
Micro-assembly robot figure；
Fig. 2 is that wear resistant toothed plate of the present invention is tempered under air-cooled 500 times micro- group with new 910 DEG C of low-alloy wear-resistant steel, 250 DEG C of oil quenching
Knit figure.
Specific embodiment
Embodiment 1
1）The tooth plate of the present embodiment employs following design with low-alloy wear-resistant steel：
Each chemical composition and mass percentage content of steel be：C：0.5%、Si：0.184%、Mn：0.88%、Cr：2.07%、Mo：
0.152%、Ni：0.709%、P：0.02%、S：0.012%、Re：0.052%, surplus is Fe and inevitable impurity element.
2）Using 1t acidity intermediate frequency furnace smeltings, furnace charge mainly has steel scrap, ferrosilicon (FeSi75), ferrochrome
(FeCr55C25), molybdenum-iron (FeMo60), electrolytic nickel, ferromanganese.The materials such as the furnace charge added by smelting process must be dried, steel scrap, chromium
Iron, molybdenum-iron, metallic nickel are packed into stove.Start to melt with 40-60% power in 10 minutes, after current fluctuation tends towards stability, with big
Power melts, and 1.5% slag former (65% fresh sand+20% slag former of rubble ash 15%+ fluorspar powders) is added in after fusing.Molten steel temperature exists
1560-1580 DEG C, pre-deoxidation is carried out with low-carbon ferromanganese and ferrosilicon, first adds in 0.2% ferromanganese, adds 0.1-0.2% ferrosilicon, temperature
1550 DEG C or more, circle cup sample is poured into a mould, checks deoxidation situation, when deoxidation is good, add in all ferromanganese and whole ferrosilicon, 1
Number rare earth alloy, is completely melt to finish, and assay chemistry used ingredient meets the requirements, and inserts aluminium and carries out final deoxidizing, addition is about 0.08%.
Ladle preheating temperature is 700 DEG C or so, and standing is poured into a mould after a certain period of time, after the completion of casting casting is allowed to be air-cooled to room temperature.
Gained casting is heat-treated, is included the following steps：
1）Quenching, less than 100 DEG C shove charges are warming up to 880 DEG C of heat preservation 2h, oil quenching with the speed of 80 DEG C/h;
2）Tempering by steel alloy tooth plate shove charge at normal temperatures after oil quenching, is warming up to 250 DEG C of heat preservation 3h with the speed of 80 DEG C/h, goes out
Stove is air-cooled.
3）Casting sampling after being heat-treated to the present embodiment carries out Mechanics Performance Testing, and hardness average is 52HRC；It prepares
Impact specimen carries out the impact flexibility test under room temperature, and the ballistic work with V-shaped notch is 19J.
Embodiment 2
1）The tooth plate of the present embodiment employs following design with low-alloy wear-resistant steel：
Each chemical composition and mass percentage content of steel are the same as embodiment 1.
2）The preparation method of casting is the same as embodiment 1.
Gained casting is heat-treated, is included the following steps：
1）Quenching, less than 100 DEG C shove charges are warming up to 860 DEG C of heat preservation 2h, oil quenching with the speed of 80 DEG C/h;
2）Tempering by steel alloy tooth plate shove charge at normal temperatures after oil quenching, is warming up to 230 DEG C of heat preservation 3h with the speed of 80 DEG C/h, goes out
Stove is air-cooled.
3）Casting sampling after being heat-treated to the present embodiment carries out Mechanics Performance Testing, and hardness average is 51HRC；It prepares
Impact specimen carries out the impact flexibility test under room temperature, and the ballistic work with V-shaped notch is 20J.
Embodiment 3
1）The tooth plate of the present embodiment employs following design with low-alloy wear-resistant steel：
Each chemical composition and mass percentage content of steel be：C：0.45%、Si：0.15%、Mn：0.85%、Cr：1.9%、Mo：
0.17%、Ni：0.75%、P：0.02%、S：0.015%、Re：0.06%, surplus is Fe and inevitable impurity element.
2）The preparation method of casting is the same as embodiment 1.
Gained casting is heat-treated, is included the following steps：
1）Quenching, less than 100 DEG C shove charges are warming up to 900 DEG C of heat preservation 2h, oil quenching with the speed of 80 DEG C/h;
2）Tempering by steel alloy tooth plate shove charge at normal temperatures after oil quenching, is warming up to 240 DEG C of heat preservation 3h with the speed of 80 DEG C/h, goes out
Stove is air-cooled.
3）Casting sampling after being heat-treated to the present embodiment carries out Mechanics Performance Testing and microstructure observation, hardness are equal
It is worth for 51HRC；It prepares the impact flexibility that impact specimen is carried out under room temperature to test, the ballistic work with V-shaped notch is 19J.
Embodiment 4
1）The tooth plate of the present embodiment employs following design with low-alloy wear-resistant steel：
Each chemical composition and mass percentage content of steel are the same as embodiment 1.
2）The preparation method of casting is the same as embodiment 1.
Gained casting is heat-treated, is included the following steps：
1）Quenching, less than 100 DEG C shove charges are warming up to 910 DEG C of heat preservation 2h, oil quenching with the speed of 80 DEG C/h;
2）Tempering by steel alloy tooth plate shove charge at normal temperatures after oil quenching, is warming up to 250 DEG C of heat preservation 3h with the speed of 80 DEG C/h, goes out
Stove is air-cooled.
3）Casting sampling after being heat-treated to the present embodiment carries out Mechanics Performance Testing and microstructure observation, hardness are equal
It is worth for 50HRC；It prepares the impact flexibility that impact specimen is carried out under room temperature to test, the ballistic work with V-shaped notch is 21J.Use ZEISS
Observer.A1m optical microphotograph sem observation metallographic structures, sample corrosion with 4% nital to be organized as be tempered
Martensite is organized with retained austenite, such as Fig. 1 and Fig. 2.
From the above description, it can be seen that the above embodiments of the present invention realize following technique effect：The present invention's
Tooth plate has high rigidity, good toughness and excellent wearability with low-alloy wear-resistant steel, can be widely applied to require high intensity,
On the engineering goods such as engineering, mining, the coal chemical industry of high-wear resistance.
Claims (3)
1. a kind of new low-alloy wear-resistant steel of wear resistant toothed plate, it is characterized in that：It is made of by mass percentage following chemical composition：
C：0.4-0.5%、Si：0.10-0.20%、Mn：0.8-0.9%、Cr：1.7-2.0%、Mo：0.15-0.20%、Ni：0.7-0.8%、P：
≤0.04%、S：≤0.04%、Re：0.05-0.07%, surplus are Fe and inevitable impurity element.
2. a kind of new low-alloy wear-resistant steel of wear resistant toothed plate according to claim 1, it is characterized in that：Described
Re is No.1 rare earth alloy.
3. a kind of new low-alloy wear-resistant steel heat treatment method of wear resistant toothed plate described in claim 1, it is characterized in that：Step is such as
Under：
1) quench, by the shove charge under less than 100 DEG C furnace temperature of the tooth plate low-alloy wear-resistant steel under above-mentioned as cast condition, to be not more than 100
DEG C/heating rate of h is warming up to 860 DEG C -920 DEG C and keeps the temperature 2h, after oil quenching;
2) it is tempered, it is fast to be not more than the heating of 100 DEG C/h by tooth plate low-alloy wear-resistant steel shove charge under normal temperature state after quenching
Degree is warming up to 200 DEG C -250 DEG C and keeps the temperature 3h, after come out of the stove it is air-cooled.
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| CN201711415725.7A CN108118245A (en) | 2017-12-25 | 2017-12-25 | A kind of wear resistant toothed plate new low-alloy wear-resistant steel and its heat treatment method |
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| CN201711415725.7A CN108118245A (en) | 2017-12-25 | 2017-12-25 | A kind of wear resistant toothed plate new low-alloy wear-resistant steel and its heat treatment method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110076296A (en) * | 2019-04-24 | 2019-08-02 | 焦作市威尔瑞福工业技术有限公司 | A kind of NEW TYPE OF COMPOSITE tooth plate casting method of high-power high throughput crusher |
| CN111014682A (en) * | 2019-10-23 | 2020-04-17 | 广州市机电工业研究所 | Powdery stainless steel structure homogenization process |
| CN112226661A (en) * | 2020-10-16 | 2021-01-15 | 内蒙金属材料研究所 | Ablation-resistant molybdenum alloy and preparation method thereof |
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| EP0925380B1 (en) * | 1996-09-09 | 2001-05-23 | Institut Français du Pétrole | Method for manufacturing self-hardening steel wire, reinforcing wire and application to a flexible duct |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110076296A (en) * | 2019-04-24 | 2019-08-02 | 焦作市威尔瑞福工业技术有限公司 | A kind of NEW TYPE OF COMPOSITE tooth plate casting method of high-power high throughput crusher |
| CN110076296B (en) * | 2019-04-24 | 2020-12-08 | 焦作市威尔瑞福工业技术有限公司 | Novel composite toothed plate casting method of high-power high-throughput crusher |
| CN111014682A (en) * | 2019-10-23 | 2020-04-17 | 广州市机电工业研究所 | Powdery stainless steel structure homogenization process |
| CN112226661A (en) * | 2020-10-16 | 2021-01-15 | 内蒙金属材料研究所 | Ablation-resistant molybdenum alloy and preparation method thereof |
| CN112226661B (en) * | 2020-10-16 | 2021-07-27 | 内蒙金属材料研究所 | Ablation-resistant molybdenum alloy and preparation method thereof |
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Application publication date: 20180605 |