WO2003062484A1 - Element for percussive rock drilling and method for its production - Google Patents
Element for percussive rock drilling and method for its production Download PDFInfo
- Publication number
- WO2003062484A1 WO2003062484A1 PCT/SE2003/000067 SE0300067W WO03062484A1 WO 2003062484 A1 WO2003062484 A1 WO 2003062484A1 SE 0300067 W SE0300067 W SE 0300067W WO 03062484 A1 WO03062484 A1 WO 03062484A1
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- WIPO (PCT)
- Prior art keywords
- steel
- following
- connection means
- range
- rock drilling
- Prior art date
Links
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 19
- 238000000034 method Methods 0.000 title claims abstract description 16
- 238000005553 drilling Methods 0.000 title claims abstract description 14
- 239000011435 rock Substances 0.000 title claims abstract description 13
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 41
- 239000010959 steel Substances 0.000 claims abstract description 41
- 239000000126 substance Substances 0.000 claims abstract description 17
- 229910000734 martensite Inorganic materials 0.000 claims abstract description 10
- 238000010438 heat treatment Methods 0.000 claims abstract description 9
- 229910052719 titanium Inorganic materials 0.000 claims description 13
- 229910052758 niobium Inorganic materials 0.000 claims description 12
- 229910052720 vanadium Inorganic materials 0.000 claims description 12
- 229910052782 aluminium Inorganic materials 0.000 claims description 8
- 239000000203 mixture Substances 0.000 claims description 5
- 238000005255 carburizing Methods 0.000 claims description 2
- 238000003754 machining Methods 0.000 claims description 2
- 229910045601 alloy Inorganic materials 0.000 description 12
- 239000000956 alloy Substances 0.000 description 12
- 238000005299 abrasion Methods 0.000 description 5
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 239000012535 impurity Substances 0.000 description 3
- 239000010410 layer Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 230000035939 shock Effects 0.000 description 2
- 238000011282 treatment Methods 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910000760 Hardened steel Inorganic materials 0.000 description 1
- 229910000846 In alloy Inorganic materials 0.000 description 1
- 229910001566 austenite Inorganic materials 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 238000010000 carbonizing Methods 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 230000001131 transforming effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- 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
-
- 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
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
-
- 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
-
- 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
-
- 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
-
- 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
- C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
- C23C8/08—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases only one element being applied
- C23C8/20—Carburising
- C23C8/22—Carburising of ferrous surfaces
Definitions
- the present invention relates to an element for percussive rock drilling with new and improved fatigue properties and production economy properties as well as to a method for manufacturing an element.
- percussive rock drilling shock waves and rotation are transferred from a drill machine via one or more rods or tubes to a cemented carbide equipped drill bit.
- the drill steel i.e. the material in bits, rods, tubes, sleeves and shank adapters, is during drilling subjected to corrosive attack. This applies in particular to underground drilling where water is used as flushing medium and where the environment in general is humid.
- corrosion fatigue arises. This is a common cause for failure of the drill steel.
- a low-alloyed, case hardened steel is normally used for percussive rock drilling.
- Case hardening requires carburization of a surface layer in order to create compressive stresses in the impact surfaces, which give certain impeding effects on fatigue and improved wear resistance for the threaded portions. Case hardening is a time consuming operation and takes a large part of the cost for manufacturing of the drill steel.
- An abrasion resistant steel (balance Fe), as shown in EP-A1 -0527276, contains as basic elements from 0.05 to 0.45 wt.% C, 0.1 to 1.0 wt.% Si, 0.1 to 2.0 wt.% Mn, 0.05 to 1.5 wt.% Ti, these contributing to an enhancement of abrasion resistance without excessively increasing the hardness of the steel. According to that document it is not necessary to enhance the hardness of the abrasion resistant steel by transforming the microstructure of the steel to a martensite which is the conventional way to enhance the abrasion resistance of steel.
- One object of the present invention is to provide an elongated element for percussive rock drilling, which further improves production economy at modern mining.
- Another object of the present invention is to provide a method for manufacturing of percussive drill steels, which implies substantial reduction in time for heat treatment.
- Fig. 1 shows a microstructure from the core of a low-alloyed steel in a magnification of 1000x viewed in light optical microscope.
- Fig. 2 shows a microstructure from the core of a drill steel according to the invention in a magnification of 1000x viewed in light optical microscope.
- the invention relates to steels for percussive rock drilling made in an alloy with primarily martensitic basic matrix. Through the martensitic structure sufficient strength and core hardness for the application are obtained.
- the tensile strength should be 1000-1700 MPa and the core hardness 375-500 Vickers.
- D is the desired case depth in mm and T is the temperature in Kelvin (K).
- K Kelvin
- the case depth is the measure used for the carburized depth and is defined as the depth where the hardness is lower than 550 Vickers.
- the desired case depth D depends in turn on the dimension of the rod, according to the formula
- R is the diameter of the rod in mm.
- the drill steel according to the present invention shall in carburized condition have a surface hardness of more than 400 Vickers, preferably 500-800 Vickers in order to give good resistance against abrasion caused by for example the motion of the thread joints, drill cuttings or contact with the surrounding rock (the bore wall).
- the carburized layer with increased hardness has a thickness of 0.5-2.0 mm.
- Steel adapted for drill steel according to the present invention has the following composition in wt.%:
- Mn ⁇ 2 preferably 0.5-1.5
- Ff 0.07, preferably >0.1 and Ff ⁇ 5, preferably ⁇ 3 and most preferably ⁇ 1
- At least one of the grain growth impeding substances shall be present in the intervals below:
- one or both threaded ends can be made according to the invention and be welded or be joined on a rod or a tube of another material.
- the present invention also relates to a method for manufacturing an elongated element for percussive rock drilling comprising at least one connection means, such as a thread and flush channel. At least the connection means is made in a steel with a structure comprising primarily martensite. The method comprises the following steps:
- the invention also relates to an elongated element for percussive rock drilling comprising at least one connection means, such as a thread, and a flush channel, wherein at least the thread is made in a steel with a structure comprising primarily martensite (i.e. 55-98 by volume% martensite), where the steel comprises at least one intentionally added substance such as Al, Ti, Nb and V, to impede grain growth during heat-treatment.
- connection means such as a thread
- a flush channel wherein at least the thread is made in a steel with a structure comprising primarily martensite (i.e. 55-98 by volume% martensite), where the steel comprises at least one intentionally added substance such as Al, Ti, Nb and V, to impede grain growth during heat-treatment.
- the intentionally added substances can in too high total content have negative influences on the toughness and machinability of the steel.
- Extension rods were manufactured from five steel alloys with compositions as disclosed below, where alloys 1-4 correspond to steels according to the invention and alloy 5 corresponds to prior art.
- the alloys 1-4 each have an intentional addition of one of the substances Al, Ti, V, and Nb, respectively, whereas the remaining three lie at impurity levels.
- Fig. 1 shows the microstructure of the core of Alloy 5 carburized for 5 hours at 960°C and
- Fig. 2 shows the microstructure of the core of Alloy 2 according to the present invention carburized for 5 hours at 960°C.
- alloys 1-4 grain size values K according to ASTM are larger than or equal to ASTM 7.5 at all heat treatment tests, which show that drill steels according to the invention obtain sufficient case depth without unwanted grain growth up to 1000°C.
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Earth Drilling (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
The present invention relates to an element for percussive rock drilling with new and improved fatigue properties and production economy properties as well as to a method for manufacturing the element. The element comprises at least one connection means and a flush channel. At least the connection means is made in a steel with a structure comprising primarily martensite. The steel comprises at least one intentionally added substance intended to impede grain growth during heat-treatment.
Description
ELEMENT FOR PERCUSSIVE ROCK DRILLING AND METHOD FOR ITS PRODUCTION
Background of the invention The present invention relates to an element for percussive rock drilling with new and improved fatigue properties and production economy properties as well as to a method for manufacturing an element.
During percussive rock drilling shock waves and rotation are transferred from a drill machine via one or more rods or tubes to a cemented carbide equipped drill bit. The drill steel, i.e. the material in bits, rods, tubes, sleeves and shank adapters, is during drilling subjected to corrosive attack. This applies in particular to underground drilling where water is used as flushing medium and where the environment in general is humid. In combination with pulsating stress, caused by bending and the above-mentioned shock waves, so-called corrosion fatigue arises. This is a common cause for failure of the drill steel. A low-alloyed, case hardened steel is normally used for percussive rock drilling. Case hardening requires carburization of a surface layer in order to create compressive stresses in the impact surfaces, which give certain impeding effects on fatigue and improved wear resistance for the threaded portions. Case hardening is a time consuming operation and takes a large part of the cost for manufacturing of the drill steel.
An abrasion resistant steel (balance Fe), as shown in EP-A1 -0527276, contains as basic elements from 0.05 to 0.45 wt.% C, 0.1 to 1.0 wt.% Si, 0.1 to 2.0 wt.% Mn, 0.05 to 1.5 wt.% Ti, these contributing to an enhancement of abrasion resistance without excessively increasing the hardness of the steel. According to that document it is not necessary to enhance the hardness of the abrasion resistant steel by transforming the microstructure of the steel to a
martensite which is the conventional way to enhance the abrasion resistance of steel.
Objects of the invention One object of the present invention is to provide an elongated element for percussive rock drilling, which further improves production economy at modern mining.
Another object of the present invention is to provide a method for manufacturing of percussive drill steels, which implies substantial reduction in time for heat treatment.
Brief description of the drawings
These and other objects are attained by an elongated element and a method for manufacturing of drill steels for percussive rock drilling such as defined in the appended claims with reference to the figures.
Fig. 1 shows a microstructure from the core of a low-alloyed steel in a magnification of 1000x viewed in light optical microscope.
Fig. 2 shows a microstructure from the core of a drill steel according to the invention in a magnification of 1000x viewed in light optical microscope.
Detailed description of the invention
The invention relates to steels for percussive rock drilling made in an alloy with primarily martensitic basic matrix. Through the martensitic structure sufficient strength and core hardness for the application are obtained. The tensile strength should be 1000-1700 MPa and the core hardness 375-500 Vickers.
By carbonizing the drill steel in gas atmosphere compressive stresses are obtained and high hardness at the surface, which prevents corrosion fatigue and improves wear resistance. To impede grain growth during heat treatment in known steels, which would lead to deteriorated toughness and fatigue strength, this is carried out at temperatures of about 900°C. To obtain a carburized layer of sufficient thickness treatment times of the order of 6-1 Oh are required.
Steels according to the invention are carburized at higher temperatures, such that shorter carburization times become possible. Carburization is carried out in a steel according to the present invention at 960-1050°C, preferably about 1000°C. Sufficient time for carburization can be estimated according to the following formula
16915 t = 9.4 -10~6 - D2 -e τ
where t is the carburization time in hours, D is the desired case depth in mm and T is the temperature in Kelvin (K). The case depth is the measure used for the carburized depth and is defined as the depth where the hardness is lower than 550 Vickers. The desired case depth D depends in turn on the dimension of the rod, according to the formula
D = 2.1 -4.2 - R~0-4
where R is the diameter of the rod in mm.
To obtain a carburized layer of sufficient thickness treatment times of the order of 2-5 hours are required according to the invention in comparison with conventional carburization times of 8-9 hours.
The drill steel according to the present invention shall in carburized condition have a surface hardness of more than 400 Vickers, preferably 500-800 Vickers in order to give good resistance against abrasion caused by for example the motion of the thread joints, drill cuttings or contact with the surrounding rock (the bore wall). Preferably, the carburized layer with increased hardness has a thickness of 0.5-2.0 mm.
Steel adapted for drill steel according to the present invention has the following composition in wt.%:
C 0.1- •0.5, preferably 0.21-0.35
Si <2, - preferably 0.1-0.5
Mn <2, preferably 0.5-1.5
Cr <5, preferably 1.0-2.0
Ni <5, preferably 2.5-3.5
Mo <2, preferably 0.1-0.5
Ti 0.01-0.05, preferably 0.015-0.030
as well as one or more of the following intentionally added grain growth impeding substances of the following range(s) in wt.%
V < 1 ,
Nb < 1 ,
Al < 0.5 and
Ti < 1
fulfilling the following relationship:
Ff > 0.07, preferably >0.1 and Ff < 5, preferably <3 and most preferably <1
where the fine grain factor
Ff= 1.8x%AI + 0.9x%Ti + 1.8x%V + 4.9x%Nb
Preferably, at least one of the grain growth impeding substances shall be present in the intervals below:
V: 0.05-0.15 Nb: 0.01-0.10 Al: 0.035-0.065 Ti: 0.05-0.10
Rather than making the whole element in the steel according to the invention one or both threaded ends can be made according to the invention and be welded or be joined on a rod or a tube of another material.
The present invention also relates to a method for manufacturing an elongated element for percussive rock drilling comprising at least one connection
means, such as a thread and flush channel. At least the connection means is made in a steel with a structure comprising primarily martensite. The method comprises the following steps:
- providing the steel with a structure comprising martensite in the range of 55-98 volume-%,
- manufacturing the steel according to melt metallurgical production technique, wherein at least one substance intended to impede grain growth during heat- treatment is intentionally added,
- performing conventional rod manufacturing and machining, whereafter - carburizing and hardening is made at temperatures of 960-1050°C, preferably about 1000°C.
The invention also relates to an elongated element for percussive rock drilling comprising at least one connection means, such as a thread, and a flush channel, wherein at least the thread is made in a steel with a structure comprising primarily martensite (i.e. 55-98 by volume% martensite), where the steel comprises at least one intentionally added substance such as Al, Ti, Nb and V, to impede grain growth during heat-treatment.
With "intentionally" is meant that the substances do not occur in steel as impurities from the melt raw material but rather are added during the steel production. The content of impurities for a substance in this type of steel is about
0.01 wt.% or less. The intentionally added substances can in too high total content have negative influences on the toughness and machinability of the steel.
Example
Extension rods were manufactured from five steel alloys with compositions as disclosed below, where alloys 1-4 correspond to steels according to the invention and alloy 5 corresponds to prior art. The alloys 1-4 each have an intentional addition of one of the substances Al, Ti, V, and Nb, respectively, whereas the remaining three lie at impurity levels. Fig. 1 shows the microstructure of the core of Alloy 5 carburized for 5 hours at 960°C and Fig. 2
shows the microstructure of the core of Alloy 2 according to the present invention carburized for 5 hours at 960°C.
%C %Cr %Ni. %M %N %A1 %Ti %V %Nb %Fe Ff
Alloy 1 0.21 1.26 2.59 0.21 0.029 0.051 0.01 0.001 0.001 rest 0.108
Alloy 2 0.22 1.34 2.62 0.27 0.020 0.021 0.08 0.001 0.001 rest 0.117
Alloy 3 0.23 1.21 2.92 0.28 0.026 0.015 0.01 0.12 0.001 rest 0.257
Alloy 4 0.22 1.29 2.76 0.25 0.019 0.017 0.01 0.001 0.090 rest 0.482
Alloy 5 0.23 1.30 2.82 0.28 0.007 0.020 0.005 0.001 0.001 rest 0.047
Heat-treatments were performed in a furnace for carburization of extension rods where a gas with the carbon potential 1.0 % was obtained by means of a mixture of nitrogen, methanol and LP-gas. At metallografic investigation the following results were obtained, where K refers to the grain size of the austenite determined in accordance with ASTM E112 and D refers to the case depth in mm:
At temperatures above 925°C unwanted grain growth occurs in alloy 5. In alloys 1-4 grain size values K according to ASTM are larger than or equal to ASTM 7.5 at all heat treatment tests, which show that drill steels according to the invention obtain sufficient case depth without unwanted grain growth up to 1000°C.
The disclosures in Swedish patent application No. 0200176-6, from which this application claims priority are incorporated herein by reference.
Claims
1. Elongated element for percussive rock drilling comprising at least one connection means and a flush channel, wherein at least said connection means is performed in a steel, characterized in that the steel has a structure comprising martensite in the range of 55-98 volume-%, and at least one intentionally added substance intended to impede grain growth during heat-treatment.
2. The element according to claim 1, characterized in that said at least one substance is any of Al, Ti, Nb and V.
3. The element according to claim 2, characterized in that at least one of the substances Al, Ti, Nb and V is present and then in the following range(s)
(wt.%):
V <1,
Nb <1,
Al <0.5 and Ti <1, wherein the range fulfills the following relationship:
0.07 < Ff < 5
where Ff= 1.8x%AI + 0.9x%Ti + 1.8x%V + 4.9x%Nb.
4. The element according to claim 3, characterized in that at least one of the substances Al, Ti, Nb and V is present and then in the following range(s) (wt.%):
V 0.05-0.15, Nb 0.01-0.10,
Al 0.035-0.065 and
Ti 0.05-0.10
5. The element according to anyone of the preceding claims 2-4, c h a r a c t e r i z e d i n that the steel in addition has the following composition in wt.%: C 0.1-0.5, preferably 0.21-0.35,
Si <2, preferably 0.1-0.5,
Mn <2, preferably 0.5-1.5,
Cr <5, preferably 1.0-2.0,
Ni <5, preferably 2.5-3.5, Mo <2, preferably 0.1-0.5 and
N 0.01-0.05, preferably 0.015-0.030
6. Method for manufacturing an elongated element for percussive rock drilling comprising at least one connection means and a flush channel, wherein at least said connection means is performed in a steel, wherein the method comprises the following steps:
- providing the steel with a structure comprising martensite in the range of 55-98 volume-%,
- manufacturing the steel according to melt metallurgical production technique, wherein at least one substance intended to impede grain growth during heat- treatment is intentionally added,
- performing conventional rod manufacturing and machining, whereafter
- carburizing and hardening is made at temperatures of 960-1050°C, preferably about 1000°C.
7. The method according to claim 6, using one or more of Al, Ti, Nb and V as a substance to impede grain growth.
8. The method according to claim 7, using one or more of the substances Al, Ti, Nb and V and then in the following range(s) (wt.%):
V <1 ,
Nb <1 , Al <0.5 and
Ti <1 , fulfilling the following relationship:
0.07 < Ff < 5
where Ff= 1.8x%AI + 0.9x%Ti + 1.8x%V + 4.9x%Nb.
9. Method according to claim 7 or 8, using one or more of the substances Al, Ti, Nb and V and then in the following range(s) (wt.%):
V 0.05-0.15,
Nb 0.01-0.10,
Al 0.035-0.065 and
Ti 0.05-0.10
10. The method according to anyone of the preceding claims 7-9 using a steel, which in addition has the following composition in wt.%:
C 0.1-0.5, preferably 0.21-0.35,
Si <2, preferably 0.1-0.5,
Mn <2, preferably 0.5-1.5,
Cr <5, preferably 1.0-2.0,
Ni <5, preferably 2.5-3.5,
Mo <2, preferably 0.1-0.5 and
N 0.01-0.05, preferably 0.015-0.030
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE0200176-6 | 2002-01-21 | ||
| SE0200176A SE525378C2 (en) | 2002-01-21 | 2002-01-21 | Elements for striking rock drilling and method for its preparation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2003062484A1 true WO2003062484A1 (en) | 2003-07-31 |
Family
ID=20286730
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/SE2003/000067 WO2003062484A1 (en) | 2002-01-21 | 2003-01-17 | Element for percussive rock drilling and method for its production |
Country Status (3)
| Country | Link |
|---|---|
| SE (1) | SE525378C2 (en) |
| WO (1) | WO2003062484A1 (en) |
| ZA (1) | ZA200405498B (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009006511A2 (en) * | 2007-07-02 | 2009-01-08 | Baker Hughes Incorporated | Earth boring drill bits made from a low-carbon, high-molybdenum alloy |
| WO2013021009A1 (en) * | 2011-08-09 | 2013-02-14 | Ascometal | Steel for manufacturing carburized steel parts, carburized steel parts produced with said steel, and method for manufacturing same |
| CN102943218A (en) * | 2012-09-08 | 2013-02-27 | 山东远大模具材料有限公司 | Steel 27Cr2Ni3SiMn2Mo for spinner roller and preparation technology thereof |
| CN103147013A (en) * | 2013-03-08 | 2013-06-12 | 首钢贵阳特殊钢有限责任公司 | Hollow steel for rock drilling tool |
| CN112048669A (en) * | 2020-08-28 | 2020-12-08 | 南京钢铁股份有限公司 | High-strength and high-toughness steel for drill pipe joint and preparation method thereof |
| CN113308645A (en) * | 2021-05-25 | 2021-08-27 | 浙江普兰卡钎具股份有限公司 | Steel for drill bit shell and preparation method thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SE439334B (en) * | 1978-07-12 | 1985-06-10 | Fagersta Ab | SOUND ATTENTION DEVICE FOR LONG-TERM SEMI-SUPPLYED METAL PRODUCTS |
| JPS61163215A (en) * | 1985-01-11 | 1986-07-23 | Kawasaki Steel Corp | Manufacture of extremely thick and high strength seamless steel pipe superior in sour resistance |
| EP0527276A1 (en) * | 1990-06-06 | 1993-02-17 | Nkk Corporation | An abrasion resistant steel |
| JPH11131181A (en) * | 1997-10-28 | 1999-05-18 | Nisshin Steel Co Ltd | Manufacture of base plate for diamond saw excellent in durability and diamond saw |
-
2002
- 2002-01-21 SE SE0200176A patent/SE525378C2/en not_active IP Right Cessation
-
2003
- 2003-01-17 WO PCT/SE2003/000067 patent/WO2003062484A1/en not_active Application Discontinuation
-
2004
- 2004-07-09 ZA ZA200405498A patent/ZA200405498B/en unknown
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SE439334B (en) * | 1978-07-12 | 1985-06-10 | Fagersta Ab | SOUND ATTENTION DEVICE FOR LONG-TERM SEMI-SUPPLYED METAL PRODUCTS |
| JPS61163215A (en) * | 1985-01-11 | 1986-07-23 | Kawasaki Steel Corp | Manufacture of extremely thick and high strength seamless steel pipe superior in sour resistance |
| EP0527276A1 (en) * | 1990-06-06 | 1993-02-17 | Nkk Corporation | An abrasion resistant steel |
| JPH11131181A (en) * | 1997-10-28 | 1999-05-18 | Nisshin Steel Co Ltd | Manufacture of base plate for diamond saw excellent in durability and diamond saw |
Non-Patent Citations (2)
| Title |
|---|
| DATABASE WPI Week 198636, Derwent World Patents Index; Class M24, AN 1986-234804, XP002964193 * |
| DATABASE WPI Week 199930, Derwent World Patents Index; Class L02, AN 1999-353176, XP002964194 * |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009006511A2 (en) * | 2007-07-02 | 2009-01-08 | Baker Hughes Incorporated | Earth boring drill bits made from a low-carbon, high-molybdenum alloy |
| WO2009006511A3 (en) * | 2007-07-02 | 2009-07-09 | Baker Hughes Inc | Earth boring drill bits made from a low-carbon, high-molybdenum alloy |
| US7905301B2 (en) | 2007-07-02 | 2011-03-15 | Baker Hughes Incorporated | Earth boring drill bits made from a low-carbon, high-molybdenum alloy |
| WO2013021009A1 (en) * | 2011-08-09 | 2013-02-14 | Ascometal | Steel for manufacturing carburized steel parts, carburized steel parts produced with said steel, and method for manufacturing same |
| FR2978969A1 (en) * | 2011-08-09 | 2013-02-15 | Ascometal Sa | STEEL FOR THE PRODUCTION OF CEMENTED PARTS, CEMENTED PART PRODUCED WITH THIS STEEL AND METHOD FOR MANUFACTURING THE SAME |
| US9587301B2 (en) | 2011-08-09 | 2017-03-07 | Asco Industries | Steel for manufacturing cemented steel parts, cemented steel parts made with said steel and method for manufacturing same |
| CN102943218A (en) * | 2012-09-08 | 2013-02-27 | 山东远大模具材料有限公司 | Steel 27Cr2Ni3SiMn2Mo for spinner roller and preparation technology thereof |
| CN103147013A (en) * | 2013-03-08 | 2013-06-12 | 首钢贵阳特殊钢有限责任公司 | Hollow steel for rock drilling tool |
| CN112048669A (en) * | 2020-08-28 | 2020-12-08 | 南京钢铁股份有限公司 | High-strength and high-toughness steel for drill pipe joint and preparation method thereof |
| CN113308645A (en) * | 2021-05-25 | 2021-08-27 | 浙江普兰卡钎具股份有限公司 | Steel for drill bit shell and preparation method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| SE0200176L (en) | 2003-07-22 |
| ZA200405498B (en) | 2005-08-31 |
| SE525378C2 (en) | 2005-02-08 |
| SE0200176D0 (en) | 2002-01-21 |
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