CN107974629A - A kind of drilling tool steel, its preparation method and drilling tool - Google Patents
A kind of drilling tool steel, its preparation method and drilling tool Download PDFInfo
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- CN107974629A CN107974629A CN201711204393.8A CN201711204393A CN107974629A CN 107974629 A CN107974629 A CN 107974629A CN 201711204393 A CN201711204393 A CN 201711204393A CN 107974629 A CN107974629 A CN 107974629A
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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
- C22C38/34—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of 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
- 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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/004—Heat treatment of ferrous alloys containing Cr and Ni
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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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/005—Heat treatment of ferrous alloys containing Mn
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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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/008—Heat treatment of ferrous alloys containing Si
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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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- 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
- C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
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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
- C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
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Abstract
The present invention provides a kind of drilling tool steel, and in terms of mass fraction, chemical composition is as follows：C：0.32~0.36%, Si：1.9~2.4%, Mn：0.3~0.6%, P：≤ 0.015%, S：≤ 0.015%, Cr：0.7~0.9%, Ni：1.9~2.2%, Mo：0.9~1.1%, V：0.14~0.19%, Nb：0.02~0.04%, surplus Fe.Present invention increase Si contents, increase substantially the yield strength and tensile strength of material；With the anti-tempered performance of Si, making material, plasticity and toughness do not reduce while very high intensity is kept；Mo contents are increased, improve the wearability and toughness of material；A small amount of V is added, crystal grain thinning, improves wearability；A small amount of Nb is added, suppresses crystal grain and grows up, improve the strength and toughness of material.Preparation method and a kind of drilling tool present invention also offers a kind of drilling tool steel.
Description
Technical field
The invention belongs to mining technical field, more particularly to a kind of drilling tool steel, its preparation method and drilling tool.
Background technology
Drilling tool is a kind of mine instrument, the Drilling eyelet in rock or other structures.Drilling tool product was using
Cheng Zhong, will be subject to the erosion corrosion of the sharp wear of rock and ore, high pressure water flow, air-flow and pit water, to bear drilling machine and be applied
The high torque added, and 2000~3000 times/min of impactor internal piston, each ballistic work are up to the high frequency punching of 80~750J
Hit.Tension and compression, torsion, bending stress stressing conditions under high speed impact rock, eyelet is finally dug out on rock.
Some wind pressure very high (more than 18bar), the stronger mine of rock abrasiveness, it is necessary to drilling tool material have it is very high
Intensity, wearability, fatigue life.But the tensile strength of common rock-drill steel is in below 1600Mpa, and technological process is answered at present
Miscellaneous, cost is very high.
The content of the invention
It is an object of the invention to provide a kind of drilling tool steel, its preparation method and drilling tool, the drilling tool steel in the present invention
There are higher intensity and plasticity and toughness at the same time.
The present invention provides a kind of drilling tool steel, and in terms of mass fraction, chemical composition is as follows：
C：0.32~0.36%, Si：1.9~2.4%, Mn：0.3~0.6%, P：≤ 0.015%, S：≤ 0.015%,
Cr：0.7~0.9%, Ni：1.9~2.2%, Mo：0.9~1.1%, V：0.14~0.19%, Nb：0.02~0.04%, surplus
For Fe.
Preferably, the chemical composition of the drilling tool steel is as follows：
C：0.34~0.35%, Si：2.0~2.3%, Mn：0.45~0.55%, P：0.014%, S：≤ 0.003%,
Cr：0.8~0.86%, Ni：2.0~2.15%, Mo：1.0~1.06%, V：0.16~0.17%, Nb：0.03%, surplus is
Fe。
Preferably, the drilling tool is tempered martensite, lower bainite and retained austenite with the metallographic structure of steel.
The present invention provides a kind of preparation method of drilling tool steel, comprises the following steps：
Raw material is subjected to Medium frequency induction smelting, LF refining, VD applications of vacuum, electroslag remelting and Re Chu successively according to proportioning
Reason, obtains drilling tool steel；
The heat treatment process is specially：After 850~890 DEG C carry out oil quenchings, 1~2 time is tempered at 260~380 DEG C, then
It is air-cooled.
Preferably, the tapping temperature that the Medium frequency induction is smelted is 1590~1620 DEG C.
Preferably, the vacuum of the VD applications of vacuum is below 50Pa；
The dwell time of the VD applications of vacuum is 12~15min.
Preferably, after the VD applications of vacuum, H content is 1.6~1.7ppm in molten steel, and O content is 4~5ppm.
Preferably, the smelting voltage in the electroslag remelting is 50~60V；Smelting electric current is 8000~8500A.
Preferably, the heat treatment process is specially：After 870 DEG C carry out oil quenching, it is tempered 1~2 time at 300 DEG C, Ran Houkong
It is cold.
The present invention provides a kind of drilling tool, is made of a steel by above-mentioned drilling tool.
The present invention provides a kind of drilling tool steel, and in terms of mass fraction, chemical composition is as follows：C：0.32~0.36%, Si：
1.9~2.4%, Mn：0.3~0.6%, P：≤ 0.015%, S：≤ 0.015%, Cr：0.7~0.9%, Ni：1.9~2.2%,
Mo：0.9~1.1%, V：0.14~0.19%, Nb：0.02~0.04%, surplus Fe.Present invention increase Si contents, significantly
Improve the yield strength and tensile strength of material；With the anti-tempered performance of Si, make material while very high intensity is kept, modeling is tough
Property does not reduce；Mo contents are increased, effectively improve the wearability of material, and toughness is slightly increased；A small amount of V is added, on the one hand
Crystal grain thinning, on the other hand improves wearability；A small amount of Nb is added, suppresses crystal grain and grows up, improve the strength and toughness of material.Experiment
The result shows that the drilling tool steel tensile strength in the present invention is 1900~2100MPa, elongation percentage is 10~13%, section shrinkage
Rate is 40~44%, and hardness is 49~53HRC.
Present invention also offers a kind of preparation method of drilling tool steel, the present invention passes through the improvement to heat treatment process, system
Obtain the complex tissue of martensite+lower bainite+retained austenite.Made by out of phase plastic constraint and the common of boundary
With making obtained drilling tool be obtained with the obdurability of steel good fit.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is attached drawing needed in technology description to be briefly described, it should be apparent that, drawings in the following description are only this
The embodiment of invention, for those of ordinary skill in the art, without creative efforts, can also basis
The attached drawing of offer obtains other attached drawings.
Fig. 1 is the metallograph of drilling tool steel in the embodiment of the present invention 1；
Fig. 2 is the metallograph of drilling tool steel in the embodiment of the present invention 2；
Fig. 3 is the metallograph of drilling tool steel in the embodiment of the present invention 3；
Fig. 4 is the metallograph of drilling tool steel in comparative example 1 of the present invention；
Fig. 5 is the metallograph of drilling tool steel in comparative example 2 of the present invention；
Fig. 6 is the metallograph of drilling tool steel in comparative example 3 of the present invention.
Embodiment
The present invention provides a kind of drilling tool steel, in terms of mass fraction, chemical composition is as follows：
C：0.32~0.36%, it is preferably 0.34~0.35%；Si：1.9~2.4%, it is preferably 2.0~2.3%；Mn：
0.3~0.6%, it is preferably 0.45~0.55%；P：≤ 0.015%, it is preferably 0.014%；S：≤ 0.015%, preferably≤
0.003%；Cr：0.7~0.9%, it is preferably 0.8~0.86%；Ni：1.9~2.2%, it is preferably 2.0~2.15%；Mo：
0.9~1.1%, it is preferably 1.0~1.06%；V：0.14~0.19%, it is preferably 0.16~0.17%；Nb：0.02~
0.04%, it is preferably 0.03%；Surplus is Fe.
Drilling tool steel in the present invention is to have these three metallographics of tempered martensite, lower bainite and retained austenite at the same time
The complex tissue of tissue, by the collective effect of out of phase plastic constraint and boundary, make the intensity of steel and toughness obtain it is good
It is good to coordinate.
Present invention also offers a kind of preparation method of drilling tool steel, comprise the following steps：
Raw material is subjected to Medium frequency induction smelting, LF refining, VD applications of vacuum, electroslag remelting and Re Chu successively according to proportioning
Reason, obtains drilling tool steel；
The heat treatment process is specially：After 850~890 DEG C carry out oil quenching, it is tempered 2 times at 260~550 DEG C, Ran Houkong
It is cold.
In the present invention, the smelting process is specific as follows：
Medium frequency induction is smelted
A, select suitable steel scrap, iron filings proportioning, it is melting down after each element content cannot exceed standard max, avoid humidity,
Get rusty, impurity material is mixed into.
B, tapping temperature：1590~1620 DEG C.
LF refining
A, it is powered and is warming up to 1620 DEG C (containing) more than；Oxygen blast carbon drop below 0.03%, is skimmed to composition lower limit；
B, 1~1.5Kg/ tons of steel-aluminium conductors are added, big argon gas amount stirring when adding aluminum steel, by composition lower limit, with addition of alloy；
C, lime are added by the 2~3% of molten steel amount, are suitably added fluorite, adjustment slag to thin, feeding precision and plus silica flour also
It is former；
D, composition is finely tuned to critical field value；
E, more than 1650 DEG C of thermometric (containing), bull ladle to VD stoves.
VD applications of vacuum
A, behind VD stoves seat storehouse, argon pressure is adjusted, feeds aluminum steel 20kg/ stoves；
B, vacuumize, 12~15min of the dwell time, below vacuum 50Pa；
C, sky is broken, thermometric, adds rare earth alloy 25Kg/ stoves；
D, more than soft blow 5min (containing)；
E, slag adds carbonization rice husk, then thermometric in vain；Determine hydrogen：1.6ppm, determine oxygen (free oxygen):4ppm.
Electroslag remelting
A, starting the arc slag making, striking current 1000A, slugging electric current 5800A；
B, 73 slag systems are selected, normally smelt voltage：50~60V, electric current：8000~8500A.Inlet water temperature≤35 DEG C, go out
Saliva temperature：45~65 DEG C, hydraulic pressure >=0.2Mpa；
C, take progressively classification to reduce current methods, be zeroed naturally after minimum stationary value stops 5~10min.Steel ingot is small
Head end is without the recessed heart, loading time：20min；
D, mould cool time：30~35min；Sand cooling after the demoulding, sand cooling time >=48h, sand must keep drying.
In the present invention, since steel have passed through electroslag remelting processing, hardening heat cannot be too high, and the present invention is preferably
850~890 DEG C of progress oil quenchings, more preferably 860~880 DEG C, be most preferably 870 DEG C；It is tempered after oil quenching, the tempering
Temperature is preferably 260~550 DEG C, is preferably 260~380 DEG C, is most preferably 300 DEG C；It is preferred that it is tempered 2 times
Present invention also offers a kind of drilling tool, is made of a steel by drilling tool above, and the drilling tool can be drill bit, piston
Or card drill sleeve.
The present invention provides a kind of drilling tool steel, and in terms of mass fraction, chemical composition is as follows：C：0.32~0.36%, Si：
1.9~2.4%, Mn：0.3~0.6%, P：≤ 0.015%, S：≤ 0.015%, Cr：0.7~0.9%, Ni：1.9~2.2%,
Mo：0.9~1.1%, V：0.14~0.19%, Nb：0.02~0.04%, surplus Fe.Present invention increase Si contents, significantly
Improve the yield strength and tensile strength of material；With the anti-tempered performance of Si, make material while very high intensity is kept, modeling is tough
Property does not reduce；Mo contents are increased, effectively improve the wearability of material, and toughness is slightly increased；A small amount of V is added, on the one hand
Crystal grain thinning, on the other hand improves wearability；A small amount of Nb is added, suppresses crystal grain and grows up, improve the strength and toughness of material.
Present invention also offers a kind of preparation method of drilling tool steel, the present invention passes through the improvement to heat treatment process, system
Obtain the complex tissue of martensite+lower bainite+retained austenite.Made by out of phase plastic constraint and the common of boundary
With making obtained drilling tool be obtained with the obdurability of steel good fit.
The present invention has the following advantages：
1) increase silicone content, control appropriate carbon content, and increase molybdenum content, reduce nickel content.Obtain the intensity of steel
While significantly lifting, plasticity and toughness significantly reduce.
2) chromium, nickel, molybdenum, vanadium, a variety of alloying elements such as niobium are added into steel, " polynary a small amount of " for playing alloying element answers
Cooperation is used.
3) compared with common drilling tool material, cost reduction, and heat treatment process flow is simple, is easy to control.
4) the steel tensile strength is up to more than 2000Mpa, yield strength reaches more than 1500Mpa, and wearability is pretty good, and fatigue
Service life is good.
In order to further illustrate the present invention, with reference to embodiments to a kind of drilling tool steel provided by the invention, its preparation
Method and drilling tool are described in detail, but cannot be understood as limiting the scope of the present invention.
Embodiment 1
Medium frequency induction is smelted：
A, select suitable steel scrap, iron filings proportioning, it is melting down after each element content cannot exceed standard max, avoid humidity,
Get rusty, impurity material is mixed into.
B, tapping temperature：1590℃.
LF refining：
A, it is powered and is warming up to 1620 DEG C (containing) more than；Oxygen blast carbon drop below 0.03%, is skimmed to composition lower limit；
B, 1Kg/ tons of steel-aluminium conductors are added, big argon gas amount stirring when adding aluminum steel, by composition lower limit, with addition of alloy；
C, lime is added by the 3% of molten steel amount, is suitably added fluorite, adjustment slag to thin, feeding precision and plus silica flour reduction；
D, composition is finely tuned to critical field value；
E, more than 1650 DEG C of thermometric (containing), bull ladle to VD stoves.
VD applications of vacuum：
A, behind VD stoves seat storehouse, argon pressure is adjusted, feeds aluminum steel 20kg/ stoves；
B, vacuumize, dwell time 15min, below vacuum 50Pa；
C, sky is broken, thermometric, adds rare earth alloy 25Kg/ stoves；
D, more than soft blow 5min (containing)；
E, slag adds carbonization rice husk, then thermometric in vain；Determine hydrogen：1.6ppm, determine oxygen (free oxygen)：4ppm.
Electroslag remelting：
A, starting the arc slag making, striking current 1000A, slugging electric current 5800A；
B, 73 slag systems are selected, normally smelt voltage：60V, electric current：8500A.Inlet water temperature≤35 DEG C, exit water temperature：45
DEG C, hydraulic pressure >=0.2Mpa；
C, take progressively classification to reduce current methods, be zeroed naturally after minimum stationary value stops 10min.The small head end of steel ingot
Without the recessed heart, loading time：20min；
D, mould cool time：30min；Sand cooling after the demoulding, sand cooling time >=48h, sand must keep drying.
Heat treatment：
870 DEG C of oil quenchings, 260 DEG C are tempered 2 times, air-cooled.
Obtained drilling tool is as shown in table 1 with the steel ultimate constituent,
The component of drilling tool steel in 1 embodiment of the present invention 1 of table
| C% | Si% | Mn% | P% | S% | Cr% | Ni% | Mo% | V% | Nb% |
| 0.34 | 2.30 | 0.55 | 0.014 | ≤0.003 | 0.86 | 2.15 | 1.06 | 0.17 | 0.03 |
Embodiment 2~3
Drilling tool steel is prepared according to the preparation method in embodiment 1, unlike, tempering process is as follows：
Embodiment 2：870 DEG C of oil quenchings, 300 DEG C are tempered 2 times, air-cooled.Obtained drilling tool composition of steel is the same as embodiment 1；
Embodiment 3：870 DEG C of oil quenchings, 380 DEG C are tempered 1 time, oil cooling.Obtained drilling tool composition of steel is the same as embodiment 1.
Comparative example 1~3
Drilling tool steel is prepared according to the preparation method in embodiment 1, unlike, tempering process is as follows：
Comparative example 1：870 DEG C of oil quenchings, 500 DEG C are tempered 1 time, oil cooling；
Comparative example 2：870 DEG C of oil quenchings, 550 DEG C are tempered 1 time, oil cooling；
Comparative example 3：870 DEG C of oil quenchings, 600 DEG C are tempered 1 time, oil cooling.
Comparative example 4
This comparative example is using electric arc furnaces, LF refining, the smelting process of VD applications of vacuum, and heat treatment process is carburizing, quenching
Height returns, low time of salt hardening and cold treatment, and obtained carbon alloy steel component is as shown in table 2,
The component of 4 medium carbon alloy steel of comparative example of the present invention of table 2
| C | Si | Mn | P | S | Cr | Ni | Mo |
| 0.30 | 0.30 | 0.50 | ≤0.015 | ≤0.015 | 1.25 | 4.0 | 0.35 |
The present invention carries out performance detection to the steel in embodiment 1~3 and comparative example 1~4, and the results are shown in Table 3.
The performance data of steel in 3 embodiment of the present invention 1~3 of table and comparative example 1~4
| σb/MPa | σs/MPa | δ % | Ψ % | AkvValue/J | Hardness/HRC | |
| Embodiment 1 | 1870 | 1542 | 11.0 | 43 | 39.8 | 50.5 |
| Embodiment 2 | 2090 | 1706 | 10.0 | 41.0 | 37.6 | 52.5 |
| Embodiment 3 | 1970 | 1593 | 10.5 | 41.5 | 36.5 | 51 |
| Comparative example 1 | 1780 | 1427 | 11.5 | 42 | 19.3 | 48 |
| Comparative example 2 | 1740 | 1386 | 11.5 | 42 | 17.5 | 47 |
| Comparative example 3 | 1598 | 1251 | 13 | 44 | 21.2 | 45.5 |
| Comparative example 4 | 1670 | 1163 | 11 | 43 | 42 | 47 |
The present invention has carried out metallographic detection to the drilling tool in embodiment 1~3 and comparative example 1~3 with steel, as a result such as Fig. 1~6
It is shown,
Metallographic structure analysis is as follows：
Such as Fig. 1,2 and 3, i.e., during 260 DEG C, 300 DEG C and 380 DEG C tempering, tissue is：Tempered martensite+lower bainite+residual
Remaining austenite.The difference of three essentially consists in residual austenite content.
During 260 DEG C of tempering, due to paralympic more, thus it is low when hardness is than 300 DEG C of tempering, it is paralympic when being tempered to 380 DEG C
Accounting significantly reduces.
Such as Fig. 4, i.e., it is secondary troostite tissue during 500 DEG C tempering.Such as Figures 5 and 6, i.e., in 550 DEG C, 600 DEG C of tempering,
Have turned into tempered sorbite tissue, precipitate showed increased.There is obvious temper brittleness when being tempered for 500~550 DEG C.
The present invention uses the carbon alloy steel containing 4% nickel in drilling tool steel and comparative example 4 in embodiment 2 to produce with 5 〞 of model
Piston, is sent to Chengde iron ore and does experiment.Mine hardness is medium partially hard, wind pressure 1.7Mpa.This steel grade drill bit is in rock drilling to 144m
When, diaper body abrasion 6mm, and the drill bit of nickeliferous 4% steel is when rock drilling is to 108m, diaper body just has worn away 9mm.Two drill bits are not sent out
It is raw to collapse other initial failures such as block, disconnected body.Clearly：The wearability of this steel grade drill bit is substantially better than the drill bit of nickeliferous 4% steel.
The present invention uses the carbon alloy steel containing 4% nickel in drilling tool steel and comparative example 4 in embodiment 2 to produce with 5 〞 of model
Piston, is sent to a certain stone pit of Nanping Prefecture and does experiment, which is granite, and hardness is medium partially hard, wind pressure 2.2Mpa.This
Steel grade piston, because of outer shell serious wear, cracking, is stopped using when use is to 4950m.Observed after piston is split out：Do not occur
Block, disconnected body, cracking are collapsed, and does not occur pressure during use；When use is to 5080m, impactor falls the piston of nickeliferous 4% steel
Pressure, cisco unity malfunction, are observed after dismantling：Piston Cracking Failure.This explanation：Under the very high working condition of wind pressure, this steel
The fatigue life of kind product even alreadys exceed nickeliferous 4% steel.
The present invention uses the carbon alloy steel containing 4% nickel in drilling tool steel and comparative example 4 in embodiment 2 to produce with 5 〞 of model
Piston, is sent to Huizhou Boluo County stone pit and does experiment.The ore-rock layer is granite, and hardness is medium partially hard, wind pressure 1.7Mpa.This
Steel grade piston, because outer shell serious wear falls pressure, is stopped using when use is to 3300m.Observed after piston is split out：Do not collapse
Block, disconnected body, cracking；The piston of nickeliferous 4% steel stops making when use is to 3500m because other reasons cause impactor to fail
With being observed after piston is split out：Block, disconnected body, cracking are not collapsed yet.This explanation：The fatigue life of this steel grade product with containing
4% steel of nickel approaches.
The drilling tool product fatigue life and wearability that drilling tool steel in the present invention it can be seen from above-mentioned experiment is produced
Nickeliferous 4% steel is met or exceeded, especially under conditions of wind pressure is higher, the advantage of the drilling tool steel in the present invention is more bright
Aobvious, during wind pressure 1.7MPa, the drilling tool in the present invention is not cracked with steel with the carbon alloy steel containing 4% nickel, but wind pressure is 2.2MPa
When, the Cracking Failure of the carbon alloy steel containing 4% nickel, the drilling tool in the present invention still can continue to use with steel.
The above is only the preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications also should
It is considered as protection scope of the present invention.
Claims (10)
1. a kind of drilling tool steel, in terms of mass fraction, chemical composition is as follows：
C：0.32~0.36%, Si：1.9~2.4%, Mn：0.3~0.6%, P：≤ 0.015%, S：≤ 0.015%, Cr：0.7
~0.9%, Ni：1.9~2.2%, Mo：0.9~1.1%, V：0.14~0.19%, Nb：0.02~0.04%, surplus Fe.
2. drilling tool steel according to claim 1, it is characterised in that the chemical composition of the drilling tool steel is as follows：
C：0.34~0.35%, Si：2.0~2.3%, Mn：0.45~0.55%, P：0.014%, S：≤ 0.003%, Cr：0.8
~0.86%, Ni：2.0~2.15%, Mo：1.0~1.06%, V：0.16~0.17%, Nb：0.03%, surplus Fe.
3. drilling tool steel according to claim 1, it is characterised in that the drilling tool is tempered martensite with the metallographic structure of steel
Body, lower bainite and retained austenite.
4. a kind of preparation method of drilling tool steel, comprises the following steps：
Raw material is subjected to Medium frequency induction smelting, LF refining, VD applications of vacuum, electroslag remelting and heat treatment according to proportioning successively, is obtained
To drilling tool steel；
The heat treatment process is specially：After 850~890 DEG C carry out oil quenching, it is tempered 1~2 time at 260~380 DEG C, Ran Houkong
It is cold.
5. preparation method according to claim 4, it is characterised in that the tapping temperature that the Medium frequency induction is smelted is 1590
~1620 DEG C.
6. preparation method according to claim 4, it is characterised in that the vacuum of the VD applications of vacuum for 50Pa with
Under；
The dwell time of the VD applications of vacuum is 12~15min.
7. preparation method according to claim 4, it is characterised in that after the VD applications of vacuum, H content is in molten steel
1.6~1.7ppm, O content are 4~5ppm.
8. preparation method according to claim 4, it is characterised in that smelting voltage in the electroslag remelting for 50~
60V；Smelting electric current is 8000~8500A.
9. preparation method according to claim 4, it is characterised in that the heat treatment process is specially：870 DEG C carry out oil
After quenching, it is tempered 1~2 time at 300 DEG C, it is then air-cooled.
A kind of 10. drilling tool, as the drilling tool steel described in claims 1 to 3 any one or claim 4~9 any one institute
Drilling tool made from the preparation method stated is made of a steel.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108894731A (en) * | 2018-07-17 | 2018-11-27 | 中铁工程装备集团有限公司 | A kind of polycrystalline diamond down-the-hold drill bit and preparation method thereof |
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