CN112813245A - Shield tunneling machine cutter ring machining heat treatment process - Google Patents
Shield tunneling machine cutter ring machining heat treatment process Download PDFInfo
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- CN112813245A CN112813245A CN202011607764.9A CN202011607764A CN112813245A CN 112813245 A CN112813245 A CN 112813245A CN 202011607764 A CN202011607764 A CN 202011607764A CN 112813245 A CN112813245 A CN 112813245A
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 38
- 238000000034 method Methods 0.000 title claims abstract description 21
- 230000005641 tunneling Effects 0.000 title claims description 7
- 238000003754 machining Methods 0.000 title claims description 6
- 238000005242 forging Methods 0.000 claims abstract description 39
- 238000010791 quenching Methods 0.000 claims abstract description 33
- 230000000171 quenching effect Effects 0.000 claims abstract description 33
- 238000005496 tempering Methods 0.000 claims abstract description 30
- 238000001816 cooling Methods 0.000 claims abstract description 29
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 25
- 239000010959 steel Substances 0.000 claims abstract description 24
- 239000000463 material Substances 0.000 claims abstract description 20
- 238000000137 annealing Methods 0.000 claims abstract description 9
- 238000004321 preservation Methods 0.000 claims description 22
- 238000003723 Smelting Methods 0.000 claims description 8
- 229910052799 carbon Inorganic materials 0.000 claims description 7
- 229910052804 chromium Inorganic materials 0.000 claims description 6
- 229910052748 manganese Inorganic materials 0.000 claims description 6
- 229910052750 molybdenum Inorganic materials 0.000 claims description 6
- 238000002360 preparation method Methods 0.000 claims description 6
- 229910052720 vanadium Inorganic materials 0.000 claims description 6
- 229910052759 nickel Inorganic materials 0.000 claims description 3
- 239000013078 crystal Substances 0.000 abstract description 3
- 239000002689 soil Substances 0.000 description 8
- 238000005516 engineering process Methods 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 238000009412 basement excavation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
Classifications
-
- 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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/22—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for drills; for milling cutters; for machine cutting tools
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
- B21J5/002—Hybrid process, e.g. forging following casting
-
- 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
-
- 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
- C21D1/26—Methods of annealing
-
- 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
- C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
- C21D1/773—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material under reduced pressure or vacuum
-
- 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
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- 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
Abstract
The invention discloses a shield machine cutter ring processing heat treatment process, which comprises the following steps: step (1), electroslag remelting is carried out to produce steel ingots; step (2) forging: forging the steel ingot by adopting a press machine with more than 8000t, wherein the forging ratio is more than 3.3; annealing in the step (3): air-cooling the processed forging to 345 ℃ and 355 ℃, heating to 855 ℃ and 875 ℃, preserving heat for 1-3h, and cooling to room temperature along with the furnace; step (4) vacuum quenching and tempering: placing the forge piece in a vacuum heat treatment furnace for vacuum quenching, wherein the quenching temperature is 1050-; the process can produce the shield machine cutter ring with excellent crystalline structure, refine crystal grains and improve the forging performance of materials, and can effectively improve the depth of the hardened layer of the cutter ring.
Description
Technical Field
The invention relates to the technical field of shield machine mechanical material processing, in particular to a shield machine cutter ring processing heat treatment process.
Background
With the vigorous development of national economy, the mechanization level at home and abroad is higher and higher, and the shield machine is also developed along with the excavation of subways and tunnels, a cutter head is driven to rotate by a hydraulic motor, the cutter head is provided with a cutter ring to excavate soil, a propulsion oil cylinder of the shield machine is started to propel the shield machine forwards, the cutter head continuously rotates to drive the cutter ring to cut the soil along with the forward propulsion of the propulsion oil cylinder, the cut soil is filled in a soil bin, at the moment, a spiral conveyor is started to convey the cut soil to a belt conveyor, then the soil is conveyed to a soil box of a muck truck by the belt conveyor and is conveyed to the ground through a vertical shaft.
As the shield machine has strong corrosivity in the working environment and can tunnel sandstone, soil, rocks and the like, the shield cutter is required to have ultrahigh hardness (HRC 55-58), high wear resistance and ultrahigh impact toughness (20-30J/CM)2) The high hardness performance can ensure effective tunneling, the high wear resistance can prolong the service life, the high impact toughness can reduce or avoid the breaking of the cutter, and the existing material is difficult to simultaneously meet the requirements of high hardness, high wear resistance and high impact toughness.
Disclosure of Invention
The invention aims to provide a shield machine cutter ring processing technology to solve the problems in the background technology.
In order to achieve the purpose, the invention is realized by the following technical means:
a shield machine cutter ring processing heat treatment process comprises the following steps:
step (1), electroslag remelting produces steel ingots: preparing materials, namely adopting a three-phase electroslag furnace and a crystallizer to carry out electroslag ingot smelting;
step (2), forging: forging the steel ingot by adopting a press machine with more than 8000t, wherein the forging ratio is more than 3.3, and crushing the as-cast structure by a heavy machine;
and (3) annealing: air-cooling the processed forging to 345 ℃ and 355 ℃, heating to 855 ℃ and 875 ℃, then carrying out primary heat preservation, preserving heat for 1-3h, and cooling to room temperature along with the furnace;
step (4), vacuum quenching and tempering: and (3) placing the processed forge piece into a vacuum heat treatment furnace for vacuum quenching, wherein the quenching temperature is 1050-.
Further, the preparation components of the shield machine cutter ring material in the step (1) comprise: 0.45 to 0.55 percent of C, 0.75 to 0.85 percent of Si, 0.35 to 0.45 percent of Mn, less than or equal to 0.2 percent of P, less than or equal to 0.2 percent of S, 5.8 to 6.2 percent of Cr, 1.7 to 1.9 percent of Mo, 1.4 to 1.6 percent of V, 0.9 to 1.1 percent of Ni and the balance of Fe.
Further, the preparation components of the shield machine cutter ring material in the step (1) comprise: 0.5 percent of C, 0.8 percent of Si, 0.4 percent of Mn, less than or equal to 0.2 percent of P, less than or equal to 0.2 percent of S, 6.0 percent of Cr, 1.8 percent of Mo, 1.5 percent of V, 1.0 percent of Ni0 percent, and the balance of Fe.
Further, in the step (3), after the forged piece after the treatment is cooled to 350 ℃, the temperature is increased to 860 ℃, and then primary heat preservation is carried out, the temperature is kept for 2 hours, and the forged piece is cooled to room temperature along with the furnace.
Further, in the step (4), the processed forge piece is placed in a vacuum heat treatment furnace for vacuum quenching, the quenching temperature is 1060 ℃, the temperature is kept for 0.5h, then tempering is carried out, the tempering temperature is 550 ℃, the temperature is kept for 2h, then air cooling is carried out, then the temperature is heated to 550 ℃, the temperature is kept for 2h, and then air cooling is carried out.
Compared with the prior art, the invention has the following beneficial effects:
the process can produce the shield machine cutter ring with excellent crystalline structure, refine crystal grains and improve the forging performance of materials, can effectively improve the depth of the hardened layer of the cutter ring, is a new material attack by combining the applicant of the invention with a steel institute of horse and steel, and a steel institute of steel, increases the hardenability of steel by increasing the carbon content of the steel to about 0.5 percent and changing other materials and corresponding proportions, effectively improves the hardness and wear resistance of the steel, reaches 55-59 of hardness, and has the impact toughness of more than or equal to 20J/CM2And the Ni is reasonably proportioned, so that the crystal grains can be effectively refined, the shield machine cutter ring has the characteristics of high hardness, wear resistance, no curling and no cracking, and is widely applied to tunnel engineering.
The specific implementation mode is as follows:
in order to make the technical solutions of the present invention better understood by those skilled in the art, the present invention is further described below with reference to the following examples:
DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION
The invention relates to a method for preparing a composite material, which comprises the following steps:
in this embodiment, a shield machine cutter ring processing heat treatment process includes the following steps:
step (1), electroslag remelting produces steel ingots: preparing materials, namely adopting a three-phase electroslag furnace and a crystallizer to carry out electroslag ingot smelting;
step (2), forging: forging the steel ingot by adopting a press machine with more than 8000t, wherein the forging ratio is more than 3.3, and crushing the as-cast structure by a heavy machine;
and (3) annealing: air-cooling the processed forging to 345 ℃ and 355 ℃, heating to 855 ℃ and 875 ℃, then carrying out primary heat preservation, preserving heat for 1-3h, and cooling to room temperature along with the furnace;
step (4), vacuum quenching and tempering: and (3) placing the processed forge piece into a vacuum heat treatment furnace for vacuum quenching, wherein the quenching temperature is 1050-.
Further, the preparation components of the shield machine cutter ring material in the step (1) comprise: 0.45 to 0.55 percent of C, 0.75 to 0.85 percent of Si, 0.35 to 0.45 percent of Mn, less than or equal to 0.2 percent of P, less than or equal to 0.2 percent of S, 5.8 to 6.2 percent of Cr, 1.7 to 1.9 percent of Mo, 1.4 to 1.6 percent of V, 0.9 to 1.1 percent of Ni and the balance of Fe.
Further, the preparation components of the shield machine cutter ring material in the step (1) comprise: 0.5 percent of C, 0.8 percent of Si, 0.4 percent of Mn, less than or equal to 0.2 percent of P, less than or equal to 0.2 percent of S, 6.0 percent of Cr, 1.8 percent of Mo, 1.5 percent of V, 1.0 percent of Ni0 percent, and the balance of Fe.
Further, in the step (3), after the forged piece after the treatment is cooled to 350 ℃, the temperature is increased to 860 ℃, and then primary heat preservation is carried out, the temperature is kept for 2 hours, and the forged piece is cooled to room temperature along with the furnace.
Further, in the step (4), the processed forge piece is placed in a vacuum heat treatment furnace for vacuum quenching, the quenching temperature is 1060 ℃, the temperature is kept for 0.5h, then tempering is carried out, the tempering temperature is 550 ℃, the temperature is kept for 2h, then air cooling is carried out, then the temperature is heated to 550 ℃, the temperature is kept for 2h, and then air cooling is carried out.
Example 1
A shield machine cutter ring processing heat treatment process comprises the following steps:
step (1), electroslag remelting produces steel ingots: preparing materials, namely adopting a three-phase electroslag furnace and a crystallizer to carry out electroslag ingot smelting;
step (2), forging: forging the steel ingot by adopting a press machine with more than 8000t, wherein the forging ratio is 3.5, and crushing the as-cast structure by a heavy machine;
and (3) annealing: cooling the processed forging to 345 ℃ in air, heating to 855 ℃, preserving heat for 1 hour, and cooling to room temperature along with the furnace;
step (4), vacuum quenching and tempering: and (3) putting the processed forge piece into a vacuum heat treatment furnace for vacuum quenching, wherein the quenching temperature is 1050 ℃, the heat preservation time is 1h, then tempering is carried out, the tempering temperature is 545 ℃, the heat preservation time is 2h, then air cooling is carried out, and the tempering time is 2 times.
Example 2
A shield machine cutter ring processing heat treatment process comprises the following steps:
step (1), electroslag remelting produces steel ingots: preparing materials, namely adopting a three-phase electroslag furnace and a crystallizer to carry out electroslag ingot smelting;
step (2), forging: forging the steel ingot by adopting a press machine with more than 8000t, wherein the forging ratio is 3.5, and crushing the as-cast structure by a heavy machine;
and (3) annealing: cooling the processed forging to 350 ℃, heating to 860 ℃, then carrying out primary heat preservation, preserving heat for 2 hours, and cooling to room temperature along with the furnace;
step (4), vacuum quenching and tempering: and (3) putting the processed forge piece into a vacuum heat treatment furnace for vacuum quenching, wherein the quenching temperature is 1060 ℃, the heat preservation is carried out for 1h, then tempering is carried out, the tempering temperature is 550 ℃, the heat preservation is carried out for 2h, then air cooling is carried out, and the tempering times are 2 times.
Example 3
A shield machine cutter ring processing heat treatment process comprises the following steps:
step (1), electroslag remelting produces steel ingots: preparing materials, namely adopting a three-phase electroslag furnace and a crystallizer to carry out electroslag ingot smelting;
step (2), forging: forging the steel ingot by adopting a press machine with more than 8000t, wherein the forging ratio is 3.5, and crushing the as-cast structure by a heavy machine;
and (3) annealing: cooling the processed forging to 350 ℃, heating to 860 ℃, then carrying out primary heat preservation, preserving heat for 2 hours, and cooling to room temperature along with the furnace;
step (4), vacuum quenching and tempering: and (3) putting the processed forge piece into a vacuum heat treatment furnace for vacuum quenching, wherein the quenching temperature is 1060 ℃, the heat preservation time is 0.5h, then tempering is carried out, the tempering temperature is 550 ℃, the heat preservation time is 2h, then air cooling is carried out, and the tempering time is 3 times.
Example 4
A shield machine cutter ring processing heat treatment process comprises the following steps:
step (1), electroslag remelting produces steel ingots: preparing materials, namely adopting a three-phase electroslag furnace and a crystallizer to carry out electroslag ingot smelting;
step (2), forging: forging the steel ingot by adopting a press machine of more than 8000t, wherein the forging ratio is 5, and crushing the as-cast structure by a heavy machine;
and (3) annealing: cooling the processed forging to 350 ℃, heating to 860 ℃, then carrying out primary heat preservation, preserving heat for 2 hours, and cooling to room temperature along with the furnace;
step (4), vacuum quenching and tempering: and (3) putting the processed forge piece into a vacuum heat treatment furnace for vacuum quenching, wherein the quenching temperature is 1060 ℃, the heat preservation is carried out for 1h, then tempering is carried out, the tempering temperature is 550 ℃, the heat preservation is carried out for 2h, then air cooling is carried out, and the tempering times are 3 times.
Example 5
A shield machine cutter ring processing heat treatment process comprises the following steps:
step (1), electroslag remelting produces steel ingots: preparing materials, namely adopting a three-phase electroslag furnace and a crystallizer to carry out electroslag ingot smelting;
step (2), forging: forging the steel ingot by adopting a press machine with more than 8000t, wherein the forging ratio is 5.5, and crushing the as-cast structure by a heavy machine;
and (3) annealing: air-cooling the processed forging to 355 ℃, heating to 870 ℃, then carrying out primary heat preservation, preserving heat for 2 hours, and cooling to room temperature along with the furnace;
step (4), vacuum quenching and tempering: and (3) putting the processed forge piece into a vacuum heat treatment furnace for vacuum quenching, wherein the quenching temperature is 1065 ℃, the heat preservation time is 0.5h, then tempering is carried out, the tempering temperature is 552 ℃, the heat preservation time is 3h, then air cooling is carried out, and the tempering time is 2 times.
Experiments prove that the hardness of the shield machine cutter ring prepared by the process can reach 55-59, and the impact toughness is more than or equal to 20J/CM2The technology can effectively improve the depth of the hardened layer of the cutter ring and meet the requirements of high hardness, high wear resistance and high impact toughness.
The embodiments disclosed in the present invention are within the scope of the claims, and the specific embodiments are only for describing the specific embodiments of the present invention, and the scope of the present invention is not limited to the specific embodiments, and the specific embodiments should not be construed as limiting the scope of the claims.
While certain exemplary embodiments of the invention have been described above by way of illustration only, it will be apparent to those skilled in the art that the described embodiments may be modified in various different ways without departing from the scope of the invention. Accordingly, the foregoing description is illustrative in nature and is not to be construed as limiting the scope of the invention as claimed.
Unless defined otherwise, all academic and scientific terms used herein have the same meaning as is understood by one of ordinary skill in the art to which this invention belongs.
In case of conflict, the present specification, including definitions, will control.
All percentages, parts, ratios, etc., are by weight unless otherwise indicated.
When a value or range of values, preferred range or list of lower preferable values and upper preferable values is given, it should be understood that it specifically discloses any range formed by any pair of values of any lower range limit or preferred value and any upper range limit or preferred value, regardless of whether ranges are separately disclosed. Where a range of numerical values is described herein, unless otherwise stated, the range is intended to include the endpoints of the range and all integers and fractions within the range.
When the term "about" or "approximately" is used to describe a numerical value or an end of a range, the disclosure should be interpreted to include the specific numerical value or end points referred to.
The use of "a" and "an" are merely for convenience and to provide a general context for the invention. Unless expressly stated otherwise, this description should be read to include one or at least one.
Claims (5)
1. A shield machine cutter ring processing heat treatment process is characterized in that: the method comprises the following steps:
step (1), electroslag remelting produces steel ingots: preparing materials, namely adopting a three-phase electroslag furnace and a crystallizer to carry out electroslag ingot smelting;
step (2), forging: forging the steel ingot by adopting a press machine with more than 8000t, wherein the forging ratio is more than 3.3, and crushing the as-cast structure by a heavy machine;
and (3) annealing: air-cooling the processed forging to 345 ℃ and 355 ℃, heating to 855 ℃ and 875 ℃, then carrying out primary heat preservation, preserving heat for 1-3h, and cooling to room temperature along with the furnace;
step (4), vacuum quenching and tempering: and (3) placing the processed forge piece into a vacuum heat treatment furnace for vacuum quenching, wherein the quenching temperature is 1050-.
2. The shield tunneling machine cutter ring machining heat treatment process according to claim 1, characterized in that: the preparation components of the shield machine cutter ring material in the step (1) comprise: 0.45 to 0.55 percent of C, 0.75 to 0.85 percent of Si, 0.35 to 0.45 percent of Mn, less than or equal to 0.2 percent of P, less than or equal to 0.2 percent of S, 5.8 to 6.2 percent of Cr, 1.7 to 1.9 percent of Mo, 1.4 to 1.6 percent of V, 0.9 to 1.1 percent of Ni and the balance of Fe.
3. The shield tunneling machine cutter ring machining heat treatment process according to claim 1, characterized in that: the preparation components of the shield machine cutter ring material in the step (1) comprise: 0.5 percent of C, 0.8 percent of Si, 0.4 percent of Mn, less than or equal to 0.2 percent of P, less than or equal to 0.2 percent of S, 6.0 percent of Cr, 1.8 percent of Mo, 1.5 percent of V, 1.0 percent of Ni0 percent, and the balance of Fe.
4. The shield tunneling machine cutter ring machining heat treatment process according to claim 1, characterized in that: in the step (3), the processed forging is cooled to 350 ℃ in air, heated to 860 ℃, and then subjected to primary heat preservation for 2 hours, and cooled to room temperature along with the furnace.
5. The shield tunneling machine cutter ring machining heat treatment process according to claim 1, characterized in that: and (4) putting the processed forge piece into a vacuum heat treatment furnace for vacuum quenching at the quenching temperature of 1060 ℃ for 0.5h, then tempering at the tempering temperature of 550 ℃, carrying out air cooling after carrying out heat preservation for 2h, then heating to 550 ℃, carrying out air cooling after carrying out heat preservation for 2 h.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011607764.9A CN112813245A (en) | 2020-12-30 | 2020-12-30 | Shield tunneling machine cutter ring machining heat treatment process |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011607764.9A CN112813245A (en) | 2020-12-30 | 2020-12-30 | Shield tunneling machine cutter ring machining heat treatment process |
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| CN115449694A (en) * | 2022-08-22 | 2022-12-09 | 成都先进金属材料产业技术研究院股份有限公司 | Shield machine cutter and production method thereof |
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| CN115449694A (en) * | 2022-08-22 | 2022-12-09 | 成都先进金属材料产业技术研究院股份有限公司 | Shield machine cutter and production method thereof |
| CN115449694B (en) * | 2022-08-22 | 2023-09-19 | 成都先进金属材料产业技术研究院股份有限公司 | Cutter of shield machine and production method thereof |
| CN117051330A (en) * | 2023-08-04 | 2023-11-14 | 威海天润新材料科技有限公司 | Steel for tunnel excavator hob ring for extremely hard rock and preparation method thereof |
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Application publication date: 20210518 |