CN105803326A - High-strength high-toughness air-cooled drill tool steel and production method thereof - Google Patents
High-strength high-toughness air-cooled drill tool steel and production method thereof Download PDFInfo
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- CN105803326A CN105803326A CN201610277176.0A CN201610277176A CN105803326A CN 105803326 A CN105803326 A CN 105803326A CN 201610277176 A CN201610277176 A CN 201610277176A CN 105803326 A CN105803326 A CN 105803326A
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- 229910001315 Tool steel Inorganic materials 0.000 title claims abstract description 17
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 12
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 30
- 239000010959 steel Substances 0.000 claims abstract description 30
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 27
- 239000000956 alloy Substances 0.000 claims abstract description 27
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 8
- 229910052761 rare earth metal Inorganic materials 0.000 claims abstract description 8
- 229910052746 lanthanum Inorganic materials 0.000 claims abstract description 6
- 238000001816 cooling Methods 0.000 claims description 46
- 238000005553 drilling Methods 0.000 claims description 26
- 238000005255 carburizing Methods 0.000 claims description 12
- 229910001563 bainite Inorganic materials 0.000 claims description 11
- 238000007670 refining Methods 0.000 claims description 11
- 229910052706 scandium Inorganic materials 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 9
- 238000003723 Smelting Methods 0.000 claims description 7
- 229910052782 aluminium Inorganic materials 0.000 claims description 7
- 229910052710 silicon Inorganic materials 0.000 claims description 7
- 239000000654 additive Substances 0.000 claims description 6
- 230000000996 additive effect Effects 0.000 claims description 6
- 238000005242 forging Methods 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 6
- 238000000265 homogenisation Methods 0.000 claims description 6
- 238000003780 insertion Methods 0.000 claims description 6
- 230000037431 insertion Effects 0.000 claims description 6
- 229910000734 martensite Inorganic materials 0.000 claims description 6
- 238000005096 rolling process Methods 0.000 claims description 6
- 238000005496 tempering Methods 0.000 claims description 6
- 210000005056 cell body Anatomy 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 2
- 235000015170 shellfish Nutrition 0.000 claims description 2
- 229910052684 Cerium Inorganic materials 0.000 abstract 1
- 229910052742 iron Inorganic materials 0.000 abstract 1
- 230000002035 prolonged effect Effects 0.000 abstract 1
- 239000000463 material Substances 0.000 description 6
- 230000003647 oxidation Effects 0.000 description 5
- 238000007254 oxidation reaction Methods 0.000 description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- 229910052799 carbon Inorganic materials 0.000 description 4
- SIXSYDAISGFNSX-UHFFFAOYSA-N scandium atom Chemical compound [Sc] SIXSYDAISGFNSX-UHFFFAOYSA-N 0.000 description 4
- 230000007547 defect Effects 0.000 description 3
- 229910018487 Ni—Cr Inorganic materials 0.000 description 2
- 229910001566 austenite Inorganic materials 0.000 description 2
- 229910001570 bauxite Inorganic materials 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000010791 quenching Methods 0.000 description 2
- 230000000171 quenching effect Effects 0.000 description 2
- 230000000717 retained effect Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 229910001339 C alloy Inorganic materials 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 241001062472 Stokellia anisodon Species 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical group [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- LUKDNTKUBVKBMZ-UHFFFAOYSA-N aluminum scandium Chemical compound [Al].[Sc] LUKDNTKUBVKBMZ-UHFFFAOYSA-N 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 150000002910 rare earth metals Chemical class 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 239000010703 silicon Substances 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
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- 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
-
- 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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/005—Modifying the physical properties by deformation combined with, or followed by, heat treatment of ferrous alloys
-
- 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
-
- 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
-
- 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
-
- 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
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
-
- 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
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
-
- 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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/002—Bainite
-
- 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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/008—Martensite
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
The invention discloses high-strength high-toughness air-cooled drill tool steel and a production method thereof. The steel comprises, by weight, 0.1%-0.40% of C, 0.7%-1.3% of Si, 1.7%-2.5% of Mn, 0.1%-0.3% of Mo, 0.04%-0.2% of V, 0.02%-0.6% of Al, 0.001%-0.08% of Sc, or 0.001%- 0.02% of the rest rare earth elements of Ce and La added at the same time, and the balance iron. The Sc comes from Al-Sc intermediate alloy, and the weight percent of the Sc in the intermediate alloy is 1.5%-4%. According to the high-strength high-toughness air-cooled drill tool steel and the production method thereof, the toughness and plasticity can be improved, so that a drill tool and other components have good matching of strength and toughness, the usage fatigue life of the drill tool is prolonged significantly, deformation is not liable to occur, and the cost is low.
Description
Technical field
The present invention relates to field of material technology, relate in particular to a kind of high-strength tenacity air cooling drilling tool steel, the most also relate to
And the preparation method of this high-strength tenacity air cooling drilling tool steel.
Background technology
Drill rod is slender rod piece, directly carry out liquid hardening be easily caused deformation seriously cannot use, therefore heavy drill shank
Manufacture and all use low-carbon alloy steel to carry out carburizing air-blast quenching, lonneal to reduce quenching distortion after shaping.On surface
Carburized layer obtains martensite, heart portion obtains martensite and adds bainite as final utilization tissue.This kind of steel uses low the most mostly
Carbon Ni-Cr system steel, it has stable performance, and obdurability is excellent, and notch sensitivity is low, top layer carbon profile is mild etc. after carburizing
Advantage.But higher Ni content causes material cost to dramatically increase, after the most this kind of material carburizing, top layer microscopic structure is thicker,
This is unfavorable to the fatigue life improving drill steel.There is people to use the low middle carbon bainite steel of Si--Mn--Mo system of low cost to carry out generation for this
For Ni-Cr system steel to reduce cost, after this kind of steel carburizing under the conditions of suitable air cooling cooling rate, it is possible to obtain high obdurability, its
Air cooled hardenability is good, whole cross section can obtain uniform bainite structure, but this kind of steel is prone to produce in carburizing process
Grain boundary oxidation, there is also the problems such as one-step temper embrittlement wide ranges simultaneously, and this will damage fatigue strength and the life-span of drilling tool, with
Time be also unfavorable for the further raising of drilling tool obdurability.
Summary of the invention
The one that it is an object of the invention to overcome disadvantages mentioned above and provide can increase toughness and plasticity, makes the components such as drilling tool
Having good combination of strength and toughness, significantly improve drilling tool and use fatigue life, be unlikely to deform, the high-strength tenacity air cooling drilling tool of low cost is used
Steel.
Another object of the present invention is to provide the production method of this high-strength tenacity air cooling drilling tool steel.
A kind of high-strength tenacity air cooling drilling tool steel of the present invention, its composition by weight percent is as follows:
C:0.1-0.40%, Si:0.7-1.3%, Mn:1.7-2.5%, Mo:0.1-0.3%, V:0.04-0.2%, Al:0.02-
0.6%, Sc:0.001-0.08%, or add remaining rare earth element ce, La:0.001-0.02% simultaneously, surplus is ferrum.
Above-mentioned a kind of high-strength tenacity air cooling drilling tool steel, wherein: Sc is from Al-Sc intermediate alloy, and Sc is at intermediate alloy
In percetage by weight be 1.5-4%.
The production method of a kind of high-strength tenacity air cooling drilling tool steel, comprises the following steps:
(1) using Al-Sc intermediate alloy as additive, its Sc percetage by weight in intermediate alloy is 1.5-4%, in smelting
Refining process after refining deoxidation use insertion that this intermediate alloy adds to the steel obtained after homogenization in molten steel containing Al-Sc
Ingot blank；
(2) steel ingot base is become a useful person through 1100 DEG C of forging rollings, then air cooling after 880-900 DEG C of heating: 10-100 DEG C/min cooling rate obtains shellfish
Family name soma, 100-200 DEG C/min cooling rate obtains bainite+martensitic structure；Through 100 DEG C-400 DEG C tempering；
(3) again after 900 DEG C of-920 DEG C of carburizings under 30-200 DEG C/min cooling rate conventional air cooling.
The present invention compared with prior art, has obvious beneficial effect, as can be known from the above technical solutions: the present invention be
Add rare earth Sc on the basis of Si-Mn-Mo, be stored in because Sc element is the most attached in bauxite, phosphorus lump ore, arizonite, individually carry
Take use and cost can be significantly increased, make Sc be difficult to obtain actual application.But smelt scandium by the scandium being enriched in bauxite to contain
Measuring high aluminum-bearing master alloy, the cost obtaining Sc can be greatly reduced.For significantly reducing the cost adding scandium, therefore use aluminum-scandium
Intermediate alloy adds at the refinery practice smelting the later stage, forms low middle carbon Si-Mn-Mo-Al-Sc system drilling tool air-colled bainite
Steel.Show that employing intermediate alloy adds to by the melting experiment of many heats and analysis and steel can play refinement transitional form bayesian
Substructure slip size in body and martensite, so that toughness and plasticity are significantly increased.Use this new material, at drilling tool
Carburizing process can avoid crystal boundary internal oxidition problem substantially, and metastable retained austenite is had important by the element such as scandium, silicon simultaneously
Thermostabilization, Al reduces again the retained austenite scale of construction simultaneously, thus significantly improves what one-step temper embrittlement produced
Temperature, makes material and drilling tool can carry out adjusting strength by improving temperature, increases toughness and plasticity, so that the structures such as drilling tool
Part has good combination of strength and toughness, significantly improves drilling tool and uses fatigue life, has important innovations.Simultaneously this new material 10-
In the range of 100 DEG C/min cooling rate, whole cross section can obtain uniform bainite structure, can obtain part more than 100/min cooling rate
Martensitic structure, has bigger air cooled hardenability.Elongated drill rod can be entered one by reducing air-cooled speed by this
Step reduces the deformation that cooling procedure produces, thus the most just decreases the alignment amount that drilling tool is follow-up, to improving drilling tool service life tool
There is well effect.
Detailed description of the invention
Embodiment 1:
The production method of a kind of high-strength tenacity air cooling drilling tool steel, comprises the following steps:
As follows:
C:0.323%, Si:1.05%, Mn:2.092%, Mo:0.25%, V:0.08%, Al:0.127%, Sc:0.008%, or simultaneously
Adding remaining rare earth element ce, La:0.001-0.02%, surplus is ferrum.
(1) using Al-Sc intermediate alloy is 1.5% as additive, its Sc percetage by weight in intermediate alloy.?
Refining process after smelting deoxidation uses insertion to be added in molten steel by this intermediate alloy obtain containing Al-Sc's after homogenization
Steel ingot base；
(2) steel ingot base is become a useful person through 1100 DEG C of forging rollings, then air cooling after 880 DEG C of heating: 10 DEG C/min cooling rate obtains bainite structure,
It is respectively provided with the obdurability of excellence through 250 DEG C of tempering, does not produce one-step temper embrittlement；
(3) after 900 DEG C of carburizings under 100 DEG C/min cooling rate conventional air cooling.Case hardness HRC60 after testing, no inner oxidation lacks
Fall into, heart portion HRC38.
Embodiment 2:
The production method of a kind of high-strength tenacity air cooling drilling tool steel, comprises the following steps:
As follows:
C:0.193%, Si:1.02%, Mn:2.02%, Mo:0.21%, V:0.11%, Al:0.501%, Sc:0.010%, or simultaneously
Add remaining rare earth element ce: 0.006% surplus is ferrum.
(1) using Al-Sc intermediate alloy is 2% as additive, its Sc percetage by weight in intermediate alloy.In smelting
Refining process after refining deoxidation use insertion that this intermediate alloy adds to the steel obtained after homogenization in molten steel containing Al-Sc
Ingot blank；
(2) steel ingot base is become a useful person through 1100 DEG C of forging rollings, then air cooling after 880 DEG C of heating: 80 DEG C/min cooling rate obtains bainite structure,
It is respectively provided with the obdurability of excellence through 250 DEG C of tempering, does not produce one-step temper embrittlement；
(3) after 920 DEG C of carburizings under 100 DEG C/min cooling rate air cooling, case hardness can obtain HRC58, no inner oxidation after testing
Defect, heart portion HRC39.
Embodiment 3:
The production method of a kind of high-strength tenacity air cooling drilling tool steel, comprises the following steps:
As follows:
C:0.1%, Si:0.7%, Mn:1.7%, Mo:0.1%, V:0.2%, Al:0.02%, Sc:0.001%, or add it simultaneously
Remaining rare earth element ce, La:0.02, surplus is ferrum.
(1) using Al-Sc intermediate alloy is 3% as additive, its Sc percetage by weight in intermediate alloy.In smelting
Refining process after refining deoxidation use insertion that this intermediate alloy adds to the steel obtained after homogenization in molten steel containing Al-Sc
Ingot blank；
(2) steel ingot base is become a useful person through 1100 DEG C of forging rollings, then air cooling after 900 DEG C of heating: 200 DEG C/min cooling rate obtains bainite+horse
Family name soma, is respectively provided with the obdurability of excellence, does not produce one-step temper embrittlement through 200 DEG C of tempering；
(3) after 910 DEG C of carburizings under 30 DEG C/min cooling rate air cooling, case hardness can obtain HRC57, no inner oxidation defect, the heart
Portion HRC36.
Embodiment 4:
The production method of a kind of high-strength tenacity air cooling drilling tool steel, comprises the following steps:
As follows:
C:0.40%, Si:1.3%, Mn:2.5%, Mo:0.3%, V:0.04%, Al:0.6%, Sc:0.08%, or add simultaneously
Remaining rare earth element ce, La:0.001% surplus are ferrum.
(1) using Al-Sc intermediate alloy is 4% as additive, its Sc percetage by weight in intermediate alloy.In smelting
Refining process after refining deoxidation use insertion that this intermediate alloy adds to the steel obtained after homogenization in molten steel containing Al-Sc
Ingot blank；
(2) steel ingot base is become a useful person through 1100 DEG C of forging rollings, then air cooling after 900 DEG C of heating: 100 DEG C/min cooling rate obtains bainite+horse
Family name soma, is respectively provided with the obdurability of excellence, does not produce one-step temper embrittlement through 350 DEG C of tempering；
(3) after 920 DEG C of carburizings under 200 DEG C/min cooling rate air cooling, case hardness can obtain HRC63, no inner oxidation defect, the heart
Portion HRC40.
The above, be only presently preferred embodiments of the present invention, and the present invention not makees any pro forma restriction, Ren Hewei
Depart from technical solution of the present invention content, any simple modification of above example being made according to the technical spirit of the present invention, etc.
With change and modification, all still fall within the range of technical solution of the present invention.
Claims (3)
1. a high-strength tenacity air cooling drilling tool steel, its composition by weight percent is as follows:
C:0.1-0.40%, Si:0.7-1.3%, Mn:1.7-2.5%, Mo:0.1-0.3%, V:0.04-0.2%, Al:0.02-
0.6%, Sc:0.001-0.08%, or add remaining rare earth element ce, La:0.001-0.02% simultaneously, surplus is ferrum.
2. a kind of high-strength tenacity air cooling drilling tool steel as claimed in claim 1, wherein: Sc exists from Al-Sc intermediate alloy, Sc
Percetage by weight in intermediate alloy is 1.5-4%.
3. a production method for high-strength tenacity air cooling drilling tool steel, comprises the following steps:
(1) using Al-Sc intermediate alloy as additive, its Sc percetage by weight in intermediate alloy is 1.5-4%, in smelting
Refining process after refining deoxidation use insertion that this intermediate alloy adds to the steel obtained after homogenization in molten steel containing Al-Sc
Ingot blank；
(2) steel ingot base is become a useful person through 1100 DEG C of forging rollings, then air cooling after 880-900 DEG C of heating, and 10-100 DEG C/min cooling rate obtains shellfish
Family name soma, 100-200 DEG C/min cooling rate obtains bainite+martensitic structure, through 100 DEG C-400 DEG C tempering；
(3) again after 900 DEG C of-920 DEG C of carburizings under 30-200 DEG C/min cooling rate conventional air cooling.
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| CN201610277176.0A CN105803326B (en) | 2016-04-30 | 2016-04-30 | The air-cooled drilling tool steel of high-strength tenacity and its production method |
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| CN201610277176.0A CN105803326B (en) | 2016-04-30 | 2016-04-30 | The air-cooled drilling tool steel of high-strength tenacity and its production method |
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| CN105803326B CN105803326B (en) | 2018-10-12 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115094336A (en) * | 2022-07-22 | 2022-09-23 | 贵州惠沣众一机械制造有限公司 | Steel for high-temperature-resistant hot-insert alloy tooth drill bit and heat treatment processing technology thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103397275A (en) * | 2013-08-09 | 2013-11-20 | 钢铁研究总院 | Martensite series wear-resistant steel and preparation method thereof |
| CN103409689A (en) * | 2013-07-31 | 2013-11-27 | 内蒙古包钢钢联股份有限公司 | Bainitic/martensitic steel treated by rare earth and special for railway frog |
-
2016
- 2016-04-30 CN CN201610277176.0A patent/CN105803326B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103409689A (en) * | 2013-07-31 | 2013-11-27 | 内蒙古包钢钢联股份有限公司 | Bainitic/martensitic steel treated by rare earth and special for railway frog |
| CN103397275A (en) * | 2013-08-09 | 2013-11-20 | 钢铁研究总院 | Martensite series wear-resistant steel and preparation method thereof |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115094336A (en) * | 2022-07-22 | 2022-09-23 | 贵州惠沣众一机械制造有限公司 | Steel for high-temperature-resistant hot-insert alloy tooth drill bit and heat treatment processing technology thereof |
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| CN105803326B (en) | 2018-10-12 |
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