CN114875324A - Steel for pre-hardened corrosion-resistant template and manufacturing method thereof - Google Patents
Steel for pre-hardened corrosion-resistant template and manufacturing method thereof Download PDFInfo
- Publication number
- CN114875324A CN114875324A CN202210552571.0A CN202210552571A CN114875324A CN 114875324 A CN114875324 A CN 114875324A CN 202210552571 A CN202210552571 A CN 202210552571A CN 114875324 A CN114875324 A CN 114875324A
- Authority
- CN
- China
- Prior art keywords
- steel
- less
- corrosion
- resistant
- hardened
- 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
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
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- 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
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
-
- 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
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
- C21D8/0263—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment following hot rolling
-
- 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
-
- 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
-
- 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
- C21D2211/005—Ferrite
-
- 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
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
A pre-hardened corrosion-resistant template steel and a manufacturing method thereof belong to the technical field of metal smelting and hot working, and solve the technical problems of high cost of the corrosion-resistant mold steel alloy, complex pre-hardening production process, poor pre-hardening hardness uniformity and the like. The steel for the pre-hardened corrosion-resistant template comprises the following chemical components in percentage by weight: c: 0.01-0.05%, Si is less than or equal to 0.40%, Mn: 1.5-2.0%, Cr: 10.00-11.00%, P is less than 0.020%, S is less than 0.010%, N: 0.08 to 0.11, and the balance of Fe and inevitable impurities. The manufacturing method comprises the following steps in sequence: converter smelting, VOD vacuum degassing, LF ladle refining → steel ingot casting → hot rolling → air cooling → low-temperature tempering. The invention has the characteristics of low alloy cost, simple and feasible pre-hardening production process and good uniformity of the hardness of the steel plate, and is the low-carbon environment-friendly steel for the pre-hardened corrosion-resistant template and the manufacturing method thereof.
Description
Technical Field
The invention belongs to the technical field of metal smelting and hot working, and particularly relates to steel for a pre-hardened corrosion-resistant template and a manufacturing method thereof.
Background
In the production of plastic products made of chemically corrosive plastics (such as polyvinyl chloride, polystyrene, etc.), corrosive gases are released, so that the material of the mold (including the mold frame, the hot runner, the mold core, etc.) does not only have certain hardness and strength, but also has corrosion resistance.
The existing mold frame and hot runner materials of the corrosion-resistant mold mainly comprise 4Cr13 martensitic stainless steel, the alloy cost of the materials is high, the prehardening heat treatment process generally adopts' 980-. Therefore, it is necessary to develop a corrosion-resistant die frame steel with equivalent performance, low alloy cost, simple production process, low carbon and environmental protection.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and solve the technical problems of high alloy cost, complex pre-hardening production process, poor pre-hardening hardness uniformity, high plate shape control difficulty and the like of the steel for the corrosion-resistant die.
The invention is realized by the following technical scheme:
a pre-hardened corrosion-resistant template steel reduces the content of an alloy element Cr on the basis of the existing 4Cr13 stainless steel, ensures that the corrosion resistance of the steel reaches the same level of 4Cr13 stainless steel by reducing carbon and adding nitrogen, and simultaneously enables the steel to be air-cooled after hot rolling to reach the pre-hardened hardness requirement range (340-380 HB), wherein: the steel for the pre-hardened corrosion-resistant template comprises the following chemical components in percentage by weight: c: 0.01-0.05%, Si is less than or equal to 0.40%, Mn: 1.5-2.0%, Cr: 10.00-11.00%, P is less than 0.020%, S is less than 0.010%, N: 0.08 to 0.11, and the balance of Fe and inevitable impurities.
A preparation method of steel for a pre-hardened corrosion-resistant template comprises the following steps:
s1, smelting: the molten steel smelted by the converter is sequentially subjected to VOD vacuum degassing and LF ladle refining, and bottom blowing nitrogen is adopted to replace heavy ferroalloy chromium nitride to carry out nitrogen alloying in the LF ladle refining process, so that the alloy cost is reduced. The molten steel comprises the following chemical components in percentage by weight: c: 0.01-0.05%, Si is less than or equal to 0.40%, Mn: 1.5-2.0%, Cr: 10.00-11.00%, P is less than 0.020%, S is less than 0.010%, N: 0.08-0.11, and the balance of Fe and inevitable impurities, and tapping molten steel and casting into steel ingots;
s2, hot rolling: heating the steel ingot prepared in the step S1 to 1180-1220 ℃ in a heating furnace, preserving heat for 4 +/-0.5 hours, and then rolling the steel ingot into a steel plate with the thickness of 30-120 mm, the width of 300-1100 mm and the length of 2000-8000 mm, wherein the final rolling temperature is 900-1000 ℃;
s3, air cooling: the steel plates hot rolled in the step S2 are simply and circularly air cooled on a cooling bed, and the distance between the steel plates is more than or equal to 1000 mm; cooling the steel plate to 50-120 ℃ in air; after air cooling, the internal structure of the steel plate is transformed from austenite to martensite, retained austenite and a small amount of ferrite;
s4, tempering: and (3) adding iron pads between the steel plates for separation during charging, heating the steel plates to 300-400 ℃ for tempering, keeping the temperature for 12-18 hours, discharging the steel plates out of the furnace, cooling the steel plates to below 50 ℃ in air, and repeating the operation for secondary tempering to obtain the steel plates for the pre-hardened corrosion-resistant template. The first tempering converts the microstructure of the steel plate into: tempered martensite + a small amount of ferrite; and (3) further removing stress by secondary tempering, so that the martensite transformed from the residual austenite is transformed into tempered martensite during the primary tempering, a stable structure of 'tempered martensite + a small amount of ferrite' is obtained, and the hardness of the steel plate is basically kept to be 340-380 HB.
In order to remove the thermal stress and the structural stress of the steel plate and convert a metastable structure martensite and residual austenite into a stable tempered martensite structure, the invention adopts a low-temperature tempering process twice at 300-400 ℃, and is characterized in that:
compared with a 4Cr13 stainless steel pre-hardening tempering process (twice tempering at 580-610 ℃), the tempering temperature of the invention is about 200 ℃, and the energy consumption can be reduced;
secondly, only a small amount of carbide is precipitated in the low-temperature tempering process, and most of Cr element is remained in the matrix, so that the corrosion resistance is facilitated;
thirdly, in the low-temperature tempering process, the hardness of the steel plate does not need to be further adjusted, so that the phenomenon of uneven hardness caused by uneven furnace temperature and the like can be avoided to a certain extent.
Further, in the step S2, the steel ingot is heated in the heating furnace at a speed of 120 ℃/h.
Further, in the step S3, the hardness of the steel plate after air cooling is 340-380HB, and the deformation of the steel plate during air cooling process
≤0.3mm/m。
Further, in the step S4, the heating rate for tempering the steel sheet is 80 ℃/h.
Compared with the prior art, the invention has the beneficial effects that:
1. the production cost is low, and the content of Cr element is reduced by 2 percent compared with that of 4Cr13 stainless steel;
2. the short-flow pre-hardening production process of 'residual heat air cooling quenching after steel plate rolling + secondary low-temperature tempering' is simple and easy to implement: compared with the pre-hardening tempering process (twice tempering at 580-610 ℃) of 4Cr13 stainless steel, the tempering temperature is about 200 ℃ lower, so that the energy consumption can be reduced;
3. only a small amount of carbide is precipitated in the low-temperature tempering process, and most of Cr element is remained in a matrix, so that the corrosion resistance of the steel plate is ensured; in the low-temperature tempering process, the hardness of the steel plate does not need to be further adjusted, so that the phenomenon of uneven hardness caused by uneven furnace temperature and the like can be avoided to a certain extent.
Detailed Description
The present invention will be described in further detail with reference to examples.
The steel for the pre-hardened corrosion-resistant template is characterized by comprising the following components in percentage by weight: the steel for the pre-hardened corrosion-resistant template comprises the following chemical components in percentage by weight: c: 0.01-0.05%, Si is less than or equal to 0.40%, Mn: 1.5-2.0%, Cr: 10.00-11.00%, P is less than 0.020%, S is less than 0.010%, N: 0.08 to 0.11, and the balance of Fe and inevitable impurities.
A preparation method of steel for a pre-hardened corrosion-resistant template comprises the following steps:
s1, smelting: the method comprises the following steps of sequentially carrying out 90-ton VOD vacuum degassing and 90-ton LF ladle refining on molten steel smelted by a 90-ton converter, wherein bottom blowing nitrogen is adopted to replace heavy ferroalloy chromium nitride to carry out nitrogen alloying in the LF ladle refining process, three groups of examples are set in the specific implementation mode, and the chemical components of finished products of each heat are shown in the following table 1;
TABLE 1 chemical composition of each heat finished product
And (3) casting the furnace molten steel into 9.1 ton steel ingots, casting 8 steel ingots in each furnace, and carrying out heating rolling on the steel ingots in a steel rolling process.
S2, hot rolling: and (4) loading the 9.1 ton steel ingot prepared in the step (S1) into a heating furnace, heating to different temperatures at a heating speed of 120 ℃/h, and then preserving heat. And then rolling the steel ingot into a steel plate by adopting a 1000mm reversible blooming mill. The heating temperature and the rolling temperature are shown in table 2 below.
TABLE 2 heating temperature, Rolling temperature
S3, air cooling: the steel plates subjected to hot rolling in the step S2 are subjected to simple pendulum air cooling on a cooling bed, and the distance between the steel plates is kept at 1000 mm; the steel sheets were furnace tempered after being cooled in air to the cooling temperatures shown in Table 3 below. And (3) performing air cooling on one steel plate to room temperature in each heat, and performing spot inspection on hardness and plate surface hardness difference by adopting a portable hardness tester: three points are respectively taken at the head, the middle and the tail of the steel plate, and nine points are taken for each steel plate to test the surface hardness of the steel plate.
TABLE 3 air cooling temperature after rolling of steel sheet and sheet hardness
S4, tempering: and (3) adding iron pads for separation between the steel plates during charging, heating to the corresponding tempering temperature in the following table 4 at a heating speed of 80 ℃/h, air-cooling to room temperature after secondary tempering, and thus obtaining the steel plate for the pre-hardened corrosion-resistant template.
TABLE 4 tempering Process parameters
The pre-hardened corrosion-resistant die steel plates prepared by the three groups of examples are subjected to surface hardness test, namely three points are respectively taken at the head, the middle and the tail of each steel plate, nine points are taken for each steel plate to test the surface hardness of the steel plate, and the comparison (HB) of the surface hardness difference of the steel plates is shown in Table 5.
TABLE 5 hardness and homogeneity of the tempered steel sheets
The microstructure of the steel plate produced in three different examples was sampled and observed, and the microstructure was tempered martensite + a small amount of ferrite.
And (3) detecting the corrosion resistance: the products obtained in the three groups of examples and the pre-hardened 4Cr13H (hardness 353HB) material are placed in 6 percent FeCl at the temperature of 25 DEG C 3 The steel is soaked in the aqueous solution for 30 minutes and subjected to a corrosion resistance comparison test, the average corrosion rate is shown in table 6, and the result shows that the corrosion resistance of the steel for the corrosion-resistant template prepared by the invention is slightly superior to that of pre-hardened 4Cr13H steel.
TABLE 6 comparison of Corrosion resistance
| Furnace number | Average corrosion rate(g/m 2 h) |
| A | 134.09 |
| B | 134.65 |
| C | 134.98 |
| 4Cr13H | 135.71 |
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (5)
1. The steel for the pre-hardened corrosion-resistant template is characterized by comprising the following components in parts by weight: the steel for the pre-hardened corrosion-resistant template comprises the following chemical components in percentage by weight: c: 0.01-0.05%, Si is less than or equal to 0.40%, Mn: 1.5-2.0%, Cr: 10.00-11.00%, P is less than 0.020%, S is less than 0.010%, N: 0.08 to 0.11, and the balance of Fe and inevitable impurities.
2. The method for preparing the steel for the pre-hardened corrosion-resistant template according to claim 1, characterized by comprising the following steps:
s1, smelting: performing VOD vacuum degassing and LF ladle refining on molten steel smelted by a converter in sequence, wherein bottom blowing nitrogen is adopted to replace heavy ferroalloy chromium nitride to perform nitrogen alloying in the LF ladle refining process, and the molten steel comprises the following chemical components in percentage by weight: c: 0.01-0.05%, Si is less than or equal to 0.40%, Mn: 1.5-2.0%, Cr: 10.00-11.00%, P is less than 0.020%, S is less than 0.010%, N: 0.08-0.11, and the balance of Fe and inevitable impurities, and tapping molten steel and casting into steel ingots;
s2, hot rolling: heating the steel ingot prepared in the step S1 to 1180-1220 ℃ in a heating furnace, preserving heat for 4 +/-0.5 hours, and then rolling the steel ingot into a steel plate with the thickness of 30-120 mm, the width of 300-1100 mm and the length of 2000-8000 mm, wherein the final rolling temperature is 900-1000 ℃;
s3, air cooling: the steel plates hot rolled in the step S2 are simply and circularly air cooled on a cooling bed, and the distance between the steel plates is more than or equal to 1000 mm; cooling the steel plate to 50-120 ℃ in air;
s4, tempering: and (3) adding iron pads between the steel plates for separation during charging, heating the steel plates to 300-400 ℃ for tempering, keeping the temperature for 12-18 hours, discharging the steel plates out of the furnace, cooling the steel plates to below 50 ℃ in air, and repeating the operation for secondary tempering to obtain the steel plates for the pre-hardened corrosion-resistant template.
3. The method for preparing the steel for the pre-hardened corrosion-resistant template according to claim 2, wherein the method comprises the following steps: in the step S2, the steel ingot is heated in the heating furnace at a rate of 120 ℃/h.
4. The method for preparing the steel for the pre-hardened corrosion-resistant template according to claim 2, wherein the method comprises the following steps: in the step S3, the hardness of the steel plate after air cooling is 340-380HB, and the deformation of the steel plate in the air cooling process is less than or equal to 0.3 mm/m.
5. The method for preparing the steel for the pre-hardened corrosion-resistant template according to claim 2, wherein the method comprises the following steps: in the step S4, the heating rate for tempering the steel sheet is 80 ℃/h.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210552571.0A CN114875324A (en) | 2022-05-19 | 2022-05-19 | Steel for pre-hardened corrosion-resistant template and manufacturing method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210552571.0A CN114875324A (en) | 2022-05-19 | 2022-05-19 | Steel for pre-hardened corrosion-resistant template and manufacturing method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114875324A true CN114875324A (en) | 2022-08-09 |
Family
ID=82678137
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210552571.0A Pending CN114875324A (en) | 2022-05-19 | 2022-05-19 | Steel for pre-hardened corrosion-resistant template and manufacturing method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114875324A (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101426942A (en) * | 2006-10-05 | 2009-05-06 | 杰富意钢铁株式会社 | Brake discs excellent in resistance to temper softening and toughness |
| CN102312168A (en) * | 2011-07-01 | 2012-01-11 | 山西太钢不锈钢股份有限公司 | Prehardening plastic die steel plate and manufacture method thereof |
| CN103898414A (en) * | 2014-04-01 | 2014-07-02 | 江苏联峰能源装备有限公司 | Steel for plastic mold and mold for plastic molding |
| CN105200348A (en) * | 2015-10-15 | 2015-12-30 | 芜湖市宝艺游乐科技设备有限公司 | High-toughness heat-resistant corrosion-resistant pre-hardened plastic die steel and preparation method thereof |
| CN109252085A (en) * | 2017-07-13 | 2019-01-22 | 鞍钢股份有限公司 | Production method of steel plate for pre-hardened plastic mold |
| WO2020115531A1 (en) * | 2018-12-06 | 2020-06-11 | Aperam | Stainless steel, products made of this steel and methods of manufacturing same |
| JP2020143309A (en) * | 2019-03-04 | 2020-09-10 | 日鉄ステンレス株式会社 | Ferritic stainless steel sheet |
-
2022
- 2022-05-19 CN CN202210552571.0A patent/CN114875324A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101426942A (en) * | 2006-10-05 | 2009-05-06 | 杰富意钢铁株式会社 | Brake discs excellent in resistance to temper softening and toughness |
| CN102312168A (en) * | 2011-07-01 | 2012-01-11 | 山西太钢不锈钢股份有限公司 | Prehardening plastic die steel plate and manufacture method thereof |
| CN103898414A (en) * | 2014-04-01 | 2014-07-02 | 江苏联峰能源装备有限公司 | Steel for plastic mold and mold for plastic molding |
| CN105200348A (en) * | 2015-10-15 | 2015-12-30 | 芜湖市宝艺游乐科技设备有限公司 | High-toughness heat-resistant corrosion-resistant pre-hardened plastic die steel and preparation method thereof |
| CN109252085A (en) * | 2017-07-13 | 2019-01-22 | 鞍钢股份有限公司 | Production method of steel plate for pre-hardened plastic mold |
| WO2020115531A1 (en) * | 2018-12-06 | 2020-06-11 | Aperam | Stainless steel, products made of this steel and methods of manufacturing same |
| EP3891316A1 (en) * | 2018-12-06 | 2021-10-13 | Aperam | Stainless steel, products made of this steel and methods of manufacturing same |
| JP2020143309A (en) * | 2019-03-04 | 2020-09-10 | 日鉄ステンレス株式会社 | Ferritic stainless steel sheet |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| WO2021169621A1 (en) | Pre-hardened mirror mold steel plate and manufacturing method therefor | |
| CN113106338B (en) | Preparation method of ultrahigh-strength high-plasticity hot stamping formed steel | |
| CN103725986B (en) | The special thick rack steel plate of the high tenacity F level used under low temperature and manufacture method thereof | |
| CN109112423B (en) | Super-thick alloy steel plate with excellent low-temperature toughness and preparation method thereof | |
| KR102597090B1 (en) | Heat treatment method for high-nitrogen, high-chromium plastic mold steel | |
| CN104988435B (en) | Low-carbon high-tenacity super-thick steel plate and manufacturing method thereof | |
| CN109852880A (en) | A kind of high heat-intensity hot-work die steel and its manufacturing method | |
| CN104911319B (en) | Low temperature spherical tank steel plate for container and its production method | |
| CN108950387B (en) | steel with excellent high-temperature performance and thick specification for nuclear power safety injection box and manufacturing method thereof | |
| CN112813360B (en) | Low-carbon Cr-Ni-Al series high-strength and high-toughness corrosion-resistant steel and preparation method thereof | |
| KR20230037040A (en) | Thick plate for high-strength container with excellent core toughness and manufacturing method | |
| CN108330386B (en) | Steel for saw blade and production method of hot rolled steel plate thereof | |
| CN105018862A (en) | High-toughness steel plate 140 mm thick and manufacturing method thereof | |
| CN108149156A (en) | A kind of big specification high uniformity abrasion-resistant stee and its manufacturing method | |
| CN101476086A (en) | Economic steel for plastic cavity die and manufacturing method thereof | |
| CN109694983A (en) | High-mirror-surface corrosion-resistant plastic die steel and manufacturing method thereof | |
| CN107988549A (en) | Low-yield-ratio welding bottle steel and manufacturing method thereof | |
| CN103045958A (en) | High-strength steel plate used at low temperature of subzero 50 DEG C and preparation method thereof | |
| CN112011743B (en) | Reinforced alloy cast steel roller and preparation method thereof | |
| CN114875324A (en) | Steel for pre-hardened corrosion-resistant template and manufacturing method thereof | |
| CN114737112A (en) | 09MnNiDR steel and production method thereof | |
| CN114635025A (en) | 45 steel round bar and production process method | |
| CN114737111A (en) | Steel for 5Ni and production method thereof | |
| CN109694994B (en) | Corrosion-resistant high-wear-resistant steel ball and manufacturing method thereof | |
| CN111424221A (en) | Stainless steel plate for lamination and manufacturing method thereof |
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 |