CN114535943A - Preparation method of large pole piece roller - Google Patents
Preparation method of large pole piece roller Download PDFInfo
- Publication number
- CN114535943A CN114535943A CN202111621659.5A CN202111621659A CN114535943A CN 114535943 A CN114535943 A CN 114535943A CN 202111621659 A CN202111621659 A CN 202111621659A CN 114535943 A CN114535943 A CN 114535943A
- Authority
- CN
- China
- Prior art keywords
- roller
- pole piece
- heat treatment
- preparation
- blank
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
- B23P15/14—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass gear parts, e.g. gear wheels
-
- 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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/38—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for roll bodies
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The invention discloses a preparation method of a large-scale pole piece roller, belonging to the technical field of heat treatment of the roller, wherein the heat treatment process comprises the following steps: s1, preparing a steel material by adopting chemical components of a high-hardenability material, and preparing a steel ingot according to a smelting procedure production process; s2, preparing a roller blank from the steel ingot according to a forging procedure production process; s3, carrying out rough machining on the roller blank; s4, performing pre-heat treatment on the rough-machined roller blank by spheroidizing annealing; s5, performing semi-finishing on the roller blank subjected to the preliminary heat treatment; s6, performing final heat treatment on the semi-finished roller blank by induction quenching; and S7, performing finish machining and detection on the finally heat-treated roller blank to obtain a finished roller. The invention improves the wear resistance of the large pole piece roller, thereby improving the continuous operation efficiency and the quality of the pole piece during rolling.
Description
Technical Field
The invention relates to the technical field of roller heat treatment, in particular to a preparation method of a large-scale pole piece roller.
Background
Electronic products such as smart phones and notebook computers, new energy vehicles such as electric automobiles and various fields using batteries are more and more, and the quality requirement is higher and higher. The roller press is a production device of a battery pole piece, a pole piece roller is a direct forming tool of the battery pole piece, the pole piece roller is a key working part of the roller press, and the early specification is generally
The modern roller press is developed towards high efficiency and high precision to roll products with higher precision and lower cost.
However, with the increase of the size of the pole piece roller, the homogenization degree of the roller is reduced, the surface hardness of the roller is more than or equal to 97HSD, and the highest level of the cold roller is achieved. Increasing the alloying elements reduces the homogeneity of the product and increases the manufacturing cost due to the segregation of the elements in the ingot. With the improvement of the demand and the quality requirement of battery products, the optimization and the improvement of the wear resistance of the large-scale pole piece roller through a heat treatment process are particularly important and urgent.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a preparation method of a large-scale pole piece roller, which improves the wear resistance of the large-scale pole piece roller, thereby improving the continuous operation efficiency and the quality of the pole piece during rolling.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a preparation method of a large-scale pole piece roller comprises the following steps:
s1, preparing a steel material by adopting chemical components of a high-hardenability material, and preparing a steel ingot according to a smelting procedure production process;
s2, preparing a roller blank from the steel ingot according to a forging procedure production process;
s3, carrying out rough machining on the roller blank;
s4, performing pre-heat treatment on the rough-machined roller blank by spheroidizing annealing;
s5, performing semi-finishing on the roller blank subjected to the preliminary heat treatment;
s6, performing final heat treatment on the semi-finished roller blank by induction quenching;
and S7, performing finish machining and detection on the finally heat-treated roller blank to obtain a finished roller.
The technical scheme of the invention is further improved as follows: in S1, the high hardenability material comprises the following chemical components in percentage by weight: 0.85 to 1.05 percent of C, 0.30 to 0.60 percent of Si, 0.30 to 0.80 percent of Mn0.00 to 3.50 percent of Cr3.00 to 3.50 percent of Ni, less than or equal to 0.30 percent of Mo0.20 to 0.60 percent of Mo0.25 percent of V, less than or equal to 0.020 percent of P; s is less than or equal to 0.015 percent; the balance of Fe and inevitable impurities.
The technical scheme of the invention is further improved as follows: in S6, the induction quenching temperature is 940-960 ℃.
The technical scheme of the invention is further improved as follows: in S6, the frequency of the induction hardening coil is increased to 300-500 HZ.
The technical scheme of the invention is further improved as follows: in S7, the specification of the finished roller is: roll barrel diameter of
The length of the roller body is 800-1200 mm.
The technical scheme of the invention is further improved as follows: in S7, the work layer structure of the finished roller is tempered hidden needle, fine needle martensite + residual austenite + carbide.
The technical scheme of the invention is further improved as follows: the residual austenite content is less than 8%.
The technical scheme of the invention is further improved as follows: in S7, the surface hardness of the finished roller is more than or equal to 99HSD, and the uniformity of the hardness is +/-0.5 HSD.
Due to the adoption of the technical scheme, the invention has the technical progress that:
1. the invention makes the structure before quenching be spherical pearlite + carbide by carrying out special spheroidizing annealing process design aiming at the preliminary heat treatment.
2. The invention improves the heating rate by improving the frequency of the induction coil of the final heat treatment, has low content of residual austenite under the same cooling condition, and improves the uniformity of stable structure, hardness and hardness.
3. The invention effectively improves the microhardness of the working layer of the roller body by improving the quenching temperature of the final heat treatment, thereby improving the abrasion resistance of the matrix.
Drawings
FIG. 1 is a flow chart of the preparation method of the pole piece roller of the invention.
Detailed Description
The invention is described in further detail below with reference to the following figures and examples:
as shown in fig. 1, a method for preparing a large-scale pole piece roller comprises the following steps:
s1, preparing a steel material by adopting chemical components of a high-hardenability material, and preparing a steel ingot according to a smelting procedure production process;
the high hardenability material comprises the following chemical components in percentage by weight: 0.85 to 1.05 percent of C, 0.30 to 0.60 percent of Si, 0.30 to 0.80 percent of Mn0.00 to 3.50 percent of Cr3.00 to 3.50 percent of Ni, less than or equal to 0.30 percent of Mo0.20 to 0.60 percent of Mo0.25 percent of V, less than or equal to 0.020 percent of P; s is less than or equal to 0.015 percent; the balance of Fe and inevitable impurities.
S2, preparing a roller blank from the steel ingot according to a forging procedure production process;
s3, carrying out rough machining on the roller blank;
s4, performing pre-heat treatment on the rough-machined roller blank by spheroidizing annealing;
the preliminary heat treatment employs spheroidizing annealing to spheroidize carbides, so that the carbide size increases.
The spheroidizing annealing process is designed, so that the roller structure after the preliminary heat treatment is changed into spherical pearlite and granular carbide from tempered sorbite, the granular carbide can be partially dissolved into austenite during the final heat treatment and partially remained in the structure, the quantity of the carbide with larger size is increased, and the granular carbide is MC3, M7C3 and other types of carbide. In the use process, the wearing mechanism of the pole piece roller mainly comprises abrasive wear and separation of carbide and a matrix, the M7C3 has good toughness and high wear resistance, the phenomenon of carbide breaking and peeling is not obvious in use, the matrix can be effectively protected in the wearing process, the matrix can relieve high internal stress borne by a carbide region in a plastic deformation mode, the matrix can support and protect the carbide, the expansion of micro cracks is effectively prevented, the abrasion of the roller surface is reduced, the precision and the rolling effect of the pole piece roller are improved, and the effect of increasing the wear resistance is achieved.
S5, performing semi-finishing on the roller blank after the preliminary heat treatment;
s6, performing final heat treatment on the semi-finished roller blank by induction quenching;
and induction quenching is adopted in the final heat treatment, the quenching temperature is 940-960 ℃, the frequency of an induction quenching coil is increased to 300-500 HZ, so that the heating rate is increased, the pole piece roller can be quenched at a higher temperature to obtain fine grains, the working layer structure of the pole piece roller is tempering hidden needles, fine needle martensite and a small amount of residual austenite plus carbide, the micro-hardness of the structure is increased to more than HV820, and the wear resistance of the working layer structure of the roller body is improved.
S7, performing finish machining and detection on the finally heat-treated roller blank to obtain a finished roller;
the specification of the roller is
X (800-1200) mm (roll diameter x roll length).
Example 1
A preparation method of a large-scale pole piece roller comprises the following steps:
s1, preparing a steel material by adopting chemical components of a high-hardenability material, and preparing a steel ingot according to a smelting procedure production process;
s2, preparing a roller blank from the steel ingot according to a forging procedure production process;
s3, carrying out rough machining on the roller blank;
s4, performing pre-heat treatment on the rough-machined roller blank by spheroidizing annealing;
and spheroidizing annealing is adopted in the preliminary heat treatment, so that spherical pearlite and carbide are obtained.
S5, performing semi-finishing on the roller blank after the preliminary heat treatment;
s6, carrying out final heat treatment on the semi-finished roller blank by adopting induction quenching;
and induction quenching is adopted for final heat treatment, the quenching temperature is 940 ℃, and the frequency of an induction quenching coil is 300 Hz.
S7, performing finish machining and detection on the finally heat-treated roller blank to obtain a finished roller;
the surface hardness is 99HSD, the hardness uniformity is +/-0.5 HSD, the residual austenite content is 6.4 percent, and the relative wear resistance is 3.4.
Example 2
A preparation method of a large-scale pole piece roller comprises the following steps:
s1, preparing a steel material by adopting chemical components of a high-hardenability material, and preparing a steel ingot according to a smelting procedure production process;
s2, preparing a roller blank from the steel ingot according to a forging procedure production process;
s3, carrying out rough machining on the roller blank;
s4, performing pre-heat treatment on the rough-machined roller blank by spheroidizing annealing;
and spheroidizing annealing is adopted in the preliminary heat treatment, so that spherical pearlite and carbide are obtained.
S5, performing semi-finishing on the roller blank subjected to the preliminary heat treatment;
s6, performing final heat treatment on the semi-finished roller blank by induction quenching;
the final heat treatment is induction quenching at 950 deg.c and the induction quenching coil frequency is 400 Hz.
S7, performing finish machining and detection on the finally heat-treated roller blank to obtain a finished roller;
the hardness of the roller is 99HSD, the uniformity of the hardness is +/-0.5 HSD, the content of residual austenite is 6.7 percent, and the relative wear resistance is 3.6.
Example 3
A preparation method of a large-scale pole piece roller comprises the following steps:
s1, preparing a steel material by adopting chemical components of a high-hardenability material, and preparing a steel ingot according to a smelting procedure production process;
s2, preparing a roller blank from the steel ingot according to a forging procedure production process;
s3, carrying out rough machining on the roller blank;
s4, performing pre-heat treatment on the rough-machined roller blank by spheroidizing annealing;
and spheroidizing annealing is adopted in the preliminary heat treatment, so that spherical pearlite and carbide are obtained.
S5, performing semi-finishing on the roller blank subjected to the preliminary heat treatment;
s6, performing final heat treatment on the semi-finished roller blank by induction quenching;
the final heat treatment is induction quenching, the quenching temperature is 960 ℃, and the frequency of an induction quenching coil is 500 Hz.
S7, performing finish machining and detection on the finally heat-treated roller blank to obtain a finished roller;
the surface hardness is 99HSD, the hardness uniformity is +/-0.5 HSD, the residual austenite content is 6.9 percent, and the relative wear resistance is 3.7.
Comparative example 1
S1, preparing steel raw materials according to the chemical components and the weight percentage in the pole piece roller material, and preparing a steel ingot according to a smelting process production process;
s2, preparing a roller blank from the steel ingot according to a forging procedure production process;
s3, carrying out rough machining on the roller blank;
s4, performing preliminary heat treatment on the rough-machined roller blank;
and obtaining tempered sorbite after the preliminary heat treatment.
S5, performing semi-finishing on the roller blank subjected to the preliminary heat treatment;
s6, carrying out final heat treatment on the semi-finished roller blank;
the final heat treatment quenching temperature is 940 ℃, and the frequency of the induction quenching coil is 150 Hz.
S7, performing finish machining and detection on the roller blank to obtain a finished roller;
the content of retained austenite of the finished roller is 8.3%, the hardness of the roller is 98HSD, and the relative wear resistance is 2.4.
Comparative example 2
S1, preparing a steel material according to the chemical components and the weight percentage content in the pole piece roller material, and preparing a steel ingot according to the smelting process production process;
s2, preparing a roller blank from the steel ingot according to a forging procedure production process;
s3, carrying out rough machining on the roller blank;
s4, performing preliminary heat treatment on the rough-machined roller blank;
and obtaining tempered sorbite after the preliminary heat treatment.
S5, performing semi-finishing on the roller blank after the preliminary heat treatment;
s6, carrying out final heat treatment on the semi-finished roller blank;
the final heat treatment quenching temperature is 960 ℃, and the frequency of the induction quenching coil is 150 Hz.
S7, performing finish machining and detection on the roller blank to obtain a finished roller;
the content of the retained austenite of the finished roller is 9.6%, the hardness of the roller is 99HSD, and the relative wear resistance is 2.6.
The detection results are shown in tables 1 and 2.
TABLE 1 Heat treatment Process parameter variation and relative abrasion resistance test results
TABLE 2 comparison table of main chemical components and weight percentage of pole piece roller
The upper and lower limit values and interval values of the process parameters (such as mass percentage, temperature, time and the like) of the invention can realize the invention, and the examples are not listed.
In conclusion, the preheating treatment process is optimized, so that the number of alloy carbides in the final roller structure is increased, and the wear resistance is improved; by optimizing the final heat treatment cooling process, the content of the retained austenite of the roller is reduced to below 8%, and the hardness uniformity of the roller body is improved to +/-0.5 HSD, so that the wear resistance of the working layer structure of the roller body is improved. The pole piece roller produced by the invention has the working layer structure of tempering hidden needles, fine needle martensite, a small amount of residual austenite and carbide, the surface hardness is more than or equal to 99HSD, the hardness uniformity is +/-0.5 HSD, and the improvement is 30% under the same experimental condition compared with the original process condition.
Claims (8)
1. A preparation method of a large-scale pole piece roller is characterized by comprising the following steps: the method comprises the following steps:
s1, preparing a steel material by adopting chemical components of a high-hardenability material, and preparing a steel ingot according to a smelting procedure production process;
s2, preparing a roller blank from the steel ingot according to a forging procedure production process;
s3, carrying out rough machining on the roller blank;
s4, performing pre-heat treatment on the rough-machined roller blank by spheroidizing annealing;
s5, performing semi-finishing on the roller blank subjected to the preliminary heat treatment;
s6, performing final heat treatment on the semi-finished roller blank by induction quenching;
and S7, performing finish machining and detection on the finally heat-treated roller blank to obtain a finished roller.
2. The preparation method of the large-scale pole piece roller according to claim 1, characterized in that: in S1, the high hardenability material comprises the following chemical components in percentage by weight: 0.85-1.05% of C, 0.30-0.60% of Si, 0.30-0.80% of Mn3.00-3.50% of Cr3.00%, less than or equal to 0.30% of Ni, 0.20-0.60% of Mo0.25%, less than or equal to 0.25% of V, and less than or equal to 0.020% of P; s is less than or equal to 0.015 percent; the balance of Fe and inevitable impurities.
3. The preparation method of the large-scale pole piece roller according to claim 1, characterized in that: in S6, the induction quenching temperature is 940-960 ℃.
4. The preparation method of the large-scale pole piece roller according to claim 3, characterized in that: in S6, the frequency of the induction hardening coil is increased to 300-500 HZ.
5. The preparation method of the large-scale pole piece roller according to claim 1, characterized in that: in S7, the specification of the finished roller is: the diameter of the roller body is 700-900 mm, and the length of the roller body is 800-1200 mm.
6. The preparation method of the large-scale pole piece roller according to claim 1, characterized in that: in S7, the work layer structure of the finished roller is tempered hidden needle, fine needle martensite + residual austenite + carbide.
7. The preparation method of the large-scale pole piece roller as claimed in claim 6, wherein the preparation method comprises the following steps: the residual austenite content is less than 8%.
8. The preparation method of the large-scale pole piece roller according to claim 1, characterized in that: in S7, the surface hardness of the finished roller is more than or equal to 99HSD, and the uniformity of the hardness is +/-0.5 HSD.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111621659.5A CN114535943A (en) | 2021-12-28 | 2021-12-28 | Preparation method of large pole piece roller |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111621659.5A CN114535943A (en) | 2021-12-28 | 2021-12-28 | Preparation method of large pole piece roller |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114535943A true CN114535943A (en) | 2022-05-27 |
Family
ID=81670050
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111621659.5A Pending CN114535943A (en) | 2021-12-28 | 2021-12-28 | Preparation method of large pole piece roller |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114535943A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115232950A (en) * | 2022-07-20 | 2022-10-25 | 湖北广力轧辊有限公司 | Integral heat treatment process for cold roll |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05132738A (en) * | 1991-11-13 | 1993-05-28 | Hitachi Ltd | Hardened roll for rolling and its production |
| CN101698902A (en) * | 2009-11-11 | 2010-04-28 | 江苏共昌轧辊有限公司 | Quenching method for integral cast steel supporting roll |
| CN103397267A (en) * | 2013-07-12 | 2013-11-20 | 中钢集团邢台机械轧辊有限公司 | Cold roll for rolling lithium battery guard plate and manufacturing method thereof |
| CN105088085A (en) * | 2015-07-25 | 2015-11-25 | 宜兴市永昌轧辊有限公司 | High-performance cold mill intermediate roll and preparation method thereof |
| CN112391582A (en) * | 2020-11-18 | 2021-02-23 | 宝钢轧辊科技有限责任公司 | Ultra-deep quench hardening layer forged steel cold rolling working roll and manufacturing method thereof |
| CN113621866A (en) * | 2021-06-30 | 2021-11-09 | 中钢集团邢台机械轧辊有限公司 | Manufacturing method of supporting roll for rolling battery pole piece |
-
2021
- 2021-12-28 CN CN202111621659.5A patent/CN114535943A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05132738A (en) * | 1991-11-13 | 1993-05-28 | Hitachi Ltd | Hardened roll for rolling and its production |
| CN101698902A (en) * | 2009-11-11 | 2010-04-28 | 江苏共昌轧辊有限公司 | Quenching method for integral cast steel supporting roll |
| CN103397267A (en) * | 2013-07-12 | 2013-11-20 | 中钢集团邢台机械轧辊有限公司 | Cold roll for rolling lithium battery guard plate and manufacturing method thereof |
| CN105088085A (en) * | 2015-07-25 | 2015-11-25 | 宜兴市永昌轧辊有限公司 | High-performance cold mill intermediate roll and preparation method thereof |
| CN112391582A (en) * | 2020-11-18 | 2021-02-23 | 宝钢轧辊科技有限责任公司 | Ultra-deep quench hardening layer forged steel cold rolling working roll and manufacturing method thereof |
| CN113621866A (en) * | 2021-06-30 | 2021-11-09 | 中钢集团邢台机械轧辊有限公司 | Manufacturing method of supporting roll for rolling battery pole piece |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115232950A (en) * | 2022-07-20 | 2022-10-25 | 湖北广力轧辊有限公司 | Integral heat treatment process for cold roll |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106319378B (en) | A kind of thin steel for saw blade substrate of major diameter and its manufacture method | |
| CN110592476B (en) | Non-quenched and tempered round steel for direct cutting and method for manufacturing truck pin shaft by using same | |
| CN110656294B (en) | Working roll special for tin-plating finisher and manufacturing method thereof | |
| CN104928586A (en) | Hot stamping die steel and production method thereof | |
| CN109763061B (en) | Non-quenched and tempered steel and preparation method thereof | |
| CN113862576B (en) | Non-quenched and tempered steel, crankshaft and production method thereof | |
| CN102618788B (en) | Support roll with high abrasion resistant performance and manufacturing method thereof | |
| CN109763078A (en) | A kind of heat-resisting alloy carburizing steel and preparation method thereof | |
| CN108149156A (en) | A kind of big specification high uniformity abrasion-resistant stee and its manufacturing method | |
| CN105088081A (en) | Bainite and martensite spring steel for stabilizer bar and manufacturing process for stabilizer bar | |
| CN1876880A (en) | Cold-work die steel for high speed stamping | |
| CN104451437A (en) | Method for preparing large high-performance cold roll | |
| CN113718174B (en) | Double-refining high-strength high-toughness long-life medium-high carbon bearing steel and preparation method thereof | |
| CN114535943A (en) | Preparation method of large pole piece roller | |
| CN103589850B (en) | Manufacturing method for scale breaking tension leveler working roll | |
| CN104120342A (en) | Roll and preparation method thereof | |
| CN108251757B (en) | Yb-containing high-performance bearing steel electroslag ingot and one-step material forming process thereof | |
| CN112391582B (en) | Ultra-deep quench hardening layer forged steel cold rolling working roll and manufacturing method thereof | |
| JPH1180896A (en) | Bearing elemental part and production thereof | |
| JP2866113B2 (en) | Corrosion resistant mold steel | |
| CN112813361A (en) | Steel for hardware tools and preparation method thereof | |
| CN107419175B (en) | Economical tool steel with good fatigue life and production method thereof | |
| CN114318138B (en) | High-hardness large-scale pole piece roller material and pole piece roller preparation method | |
| CN107779753B (en) | Low-hardenability high-carbon gear steel and heat treatment process | |
| JPH0559527A (en) | Production of steel excellent in wear resistance and rolling fatigue characteristic |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |