CN115710677A - Method for improving uneven quenching hardness of 75Cr1 saw blade steel - Google Patents
Method for improving uneven quenching hardness of 75Cr1 saw blade steel Download PDFInfo
- Publication number
- CN115710677A CN115710677A CN202211437673.4A CN202211437673A CN115710677A CN 115710677 A CN115710677 A CN 115710677A CN 202211437673 A CN202211437673 A CN 202211437673A CN 115710677 A CN115710677 A CN 115710677A
- Authority
- CN
- China
- Prior art keywords
- converter
- steel
- temperature
- carrying
- adopted
- 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
-
- 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
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
The invention discloses a method for improving uneven quenching hardness of 75Cr1 saw blade steel, which comprises the following steps: the smelting-continuous casting production process flow comprises the following steps: molten iron pretreatment, converter top and bottom combined blowing smelting, LF external refining, RH vacuum treatment and slab continuous casting; (2) hot rolling production process flow: heating a casting blank, rough rolling, finish rolling, coiling, warehousing and slow cooling; the tapping temperature of the casting blank is 1230-1270 ℃, 2-frame rolling mills are adopted for rough rolling, and 7-frame continuous variable crown rolling mills are adopted for finish rolling; the finish rolling temperature of finish rolling is 845-875 ℃, and the thickness of the hot rolled steel strip is 8mm; the cooling adopts laminar flow cooling equipment and a post-dispersion cooling mode, and the coiling temperature is 680-720 ℃. The invention provides a method for improving uneven quenching hardness of 75Cr1 saw blade steel, and the 75Cr1 saw blade steel has high strength and hardness and even hardness after quenching.
Description
Technical Field
The invention relates to a method for improving uneven quenching hardness of 75Cr1 saw blade steel.
Background
The 75Cr1 steel is a high-carbon alloy tool steel with a certain content of Cr, and is widely used for saw blades used in industries such as stone, building, machinery manufacturing and the like due to high strength, hardness and ultrahigh wear resistance, and comprises a diamond saw blade matrix, a hard alloy saw blade matrix and a metal cold-cutting and hot-cutting circular saw blade to manufacture various saw blade steels such as high-precision cutting saw blades, punches, razors and the like.
The chemical composition and heat treatment process of steel determine the mechanical properties and service life of steel products. For products requiring high mechanical properties such as saw blade matrix, carbon steel or alloy steel with high carbon content is usually adopted for manufacturing, and the products are quenched and tempered at medium temperature to ensure that tempered troostite structures meeting the performance requirements are obtained.
For saw blade steel, the most important mechanical properties are hardness after quenching and tempering. In the development process of 75Cr1 saw blade steel, the phenomenon of uneven hardness of the steel plate after quenching is found, and the steel plate does not meet the relevant standards and user requirements. Therefore, how to obtain the saw blade steel with uniform hardness after quenching is a technical problem to be solved at present.
Disclosure of Invention
In order to solve the above problems, the present invention provides a method for improving the uneven quenching hardness of 75Cr1 saw blade steel, wherein the 75Cr1 saw blade steel has high strength and hardness, and has uniform hardness after quenching.
In order to solve the technical problems, the invention adopts the following technical scheme:
the invention discloses a method for improving uneven quenching hardness of 75Cr1 saw blade steel, which comprises the following steps:
(1) The smelting-continuous casting production process flow comprises the following steps: molten iron pretreatment, converter top and bottom combined blowing smelting, LF external refining, RH vacuum treatment and slab continuous casting; wherein the molten steel for casting machine comprises the following components: 0.75 to 0.80%, si:0.25 to 0.35%, mn: 0.70-0.90%, cr:0.35 to 0.65%, al: less than or equal to 0.04 percent, B:0.001 to 0.004 percent, less than or equal to 0.020 percent of P, less than or equal to 0.012 percent of S, and the balance of Fe and inevitable impurities;
(2) The hot rolling production process flow comprises the following steps: heating a casting blank, rough rolling, finish rolling, coiling, warehousing and slow cooling; the discharging temperature of the casting blank is 1230-1270 ℃, the rough rolling is carried out by adopting a 2-frame rolling mill, and the finish rolling is carried out by adopting a 7-frame continuous variable-crown rolling mill; the finish rolling temperature of finish rolling is 845-875 ℃, and the thickness of the hot rolled steel strip is 8mm; the cooling adopts laminar flow cooling equipment and a post-dispersion cooling mode, and the coiling temperature is 680-720 ℃.
Further, the method specifically comprises the following steps: carrying out desulfurization pretreatment on molten iron, carrying out decarburization and dephosphorization by adopting a top-bottom combined blowing converter to obtain molten steel, blowing argon in the whole process of converter smelting, adding scrap steel into the converter, and carrying out converter tapping at a temperature of 1655 ℃; LF refining adopts large slag amount for slagging and desulfurizing, and ensures that S is less than or equal to 0.012%; then, carrying out RH external refining on the molten steel smelted by the converter, and carrying out deep decarburization treatment according to the in-place components and temperature of the RH molten steel supplied by the converter; heating the plate blank at 1235 ℃ for 170min, and removing phosphorus from the heated plate blank by using high-pressure water; the width is fixed by a width fixing press, 2 frames are adopted for rough rolling, and 7 frames are adopted for CVC finish rolling; the finish rolling temperature is 845 ℃, and the thickness of a finished product is 8.0mm; and post-dispersion cooling is adopted in laminar cooling, the temperature of the steel strip is reduced to 682 ℃, and the steel strip is coiled, so that the steel strip can be obtained finally.
Further, the method specifically comprises the following steps: carrying out desulfurization pretreatment on molten iron, carrying out decarburization and dephosphorization on the molten iron by adopting a top-bottom combined blown converter to obtain molten steel, blowing argon in the whole process of the converter smelting, adding scrap steel into the converter, and carrying out steel tapping at the converter temperature of 1657 ℃; the LF refining adopts large slag amount for slagging and desulfurization, and ensures that S is less than or equal to 0.012%; then, carrying out RH external refining on the molten steel smelted by the converter, and carrying out deep decarburization treatment according to the in-place components and the temperature of the RH molten steel supplied by the converter; heating the plate blank at 1237 ℃ for 172min, and removing phosphorus from the heated plate blank by using high-pressure water; the width is fixed by a width fixing press, 2 frames are adopted for rough rolling, and 7 frames are adopted for CVC finish rolling; the finish rolling temperature is 847 ℃, and the thickness of the finished product is 8.0mm; and post-dispersion cooling is adopted in laminar cooling, the temperature of the steel strip is reduced to 684 ℃ for coiling, and finally the steel strip can be obtained.
Further, the method specifically comprises the following steps: carrying out desulfurization pretreatment on molten iron, carrying out decarburization and dephosphorization on the molten iron by adopting a top-bottom combined blown converter to obtain molten steel, blowing argon in the whole process of the converter smelting, adding scrap steel into the converter, and carrying out tapping temperature of the converter of 1653 ℃; the LF refining adopts large slag amount for slagging and desulfurization, and ensures that S is less than or equal to 0.012%; then, carrying out RH external refining on the molten steel smelted by the converter, and carrying out deep decarburization treatment according to the in-place components and temperature of the RH molten steel supplied by the converter; heating the plate blank at 1233 ℃ for 169min, and removing phosphorus from the heated plate blank by using high-pressure water; the width is fixed by a width fixing press, 2 frames are adopted for rough rolling, and 7 frames are adopted for CVC finish rolling; the finish rolling temperature is 846 ℃, and the thickness of a finished product is 8.0mm; and (4) performing post-dispersion cooling by laminar cooling, and reducing the temperature of the steel strip to 683 ℃ for coiling to finally obtain the steel strip.
Compared with the prior art, the invention has the beneficial technical effects that:
the 75Cr1 saw blade steel has high strength and hardness, and the hardness is uniform after quenching.
Detailed Description
The present invention is described in more detail below by way of specific examples. The examples are merely illustrative of the best mode of carrying out the invention and do not limit the scope of the invention in any way.
Example 1
The method comprises the following steps of carrying out desulfurization pretreatment on molten iron, carrying out decarburization and dephosphorization on the molten iron by adopting a top-bottom combined blown converter to obtain molten steel, blowing argon in the whole process of the converter smelting, adding scrap steel into the converter, and carrying out steel tapping at the converter temperature of 1655 ℃. The LF refining adopts large slag amount for slagging and desulfurization, and ensures that S is less than or equal to 0.012 percent. Then, the molten steel after the converter smelting is subjected to RH external refining, and deep decarburization treatment is performed according to the in-place composition and temperature of the RH molten steel supplied by the converter, and the chemical composition of the RH external refining supplied by a casting machine is shown in Table 1. The heating temperature of the plate blank is 1235 ℃, the heating time is 170min, and the heated plate blank is dephosphorized by high-pressure water. The width is fixed by a width fixing press, 2 frames are adopted for rough rolling, and 7 frames are adopted for CVC finish rolling. The finish rolling temperature is 845 ℃, and the thickness of the finished product is 8.0mm. And post-dispersion cooling is adopted in laminar cooling, the temperature of the steel strip is reduced to 682 ℃, and the steel strip is coiled, so that the steel strip can be obtained finally.
Example 2
The method comprises the following steps of carrying out desulfurization pretreatment on molten iron, carrying out decarburization and dephosphorization on the molten iron by adopting a top-bottom combined blown converter to obtain molten steel, blowing argon in the whole process of the converter smelting, adding scrap steel into the converter, and carrying out 1657 ℃ of tapping temperature of the converter. The LF refining adopts large slag amount for slagging and desulfurization, and ensures that S is less than or equal to 0.012 percent. Then, the molten steel after the converter smelting is subjected to RH external refining, and deep decarburization treatment is performed according to the in-place composition and temperature of the RH molten steel supplied by the converter, and the chemical composition of the RH external refining supplied by a casting machine is shown in Table 1. The heating temperature of the plate blank is 1237 ℃, the heating time is 172min, and the heated plate blank is subjected to high-pressure water dephosphorization. The width is fixed by a width fixing press, 2 frames are adopted for rough rolling, and 7 frames are adopted for CVC finish rolling. The finish rolling temperature is 847 ℃, and the thickness of the finished product is 8.0mm. And post-dispersion cooling is adopted in laminar cooling, the temperature of the steel strip is reduced to 684 ℃ for coiling, and finally the steel strip can be obtained.
Example 3
The method comprises the following steps of carrying out desulfurization pretreatment on molten iron, carrying out decarburization and dephosphorization on the molten iron by adopting a top-bottom combined blown converter to obtain molten steel, blowing argon in the whole process of the converter smelting, adding scrap steel into the converter, and carrying out steel tapping at the converter temperature of 1653 ℃. LF refining adopts large slag amount to carry out slagging and desulfurization, and ensures that S is less than or equal to 0.012 percent. Then, the molten steel after the converter smelting is subjected to RH external refining, and deep decarburization treatment is performed according to the in-place composition and temperature of the RH molten steel supplied by the converter, and the chemical composition of the RH external refining supplied by a casting machine is shown in Table 1. The heating temperature of the plate blank is 1233 ℃, the heating time is 169min, and the heated plate blank is subjected to high-pressure water dephosphorization. The width is fixed by a width fixing press, 2 frames are adopted for rough rolling, and 7 frames are adopted for CVC finish rolling. The finish rolling temperature is 846 ℃, and the thickness of the finished product is 8.0mm. And (4) performing post-dispersion cooling by laminar cooling, and reducing the temperature of the steel strip to 683 ℃ for coiling to finally obtain the steel strip.
Comparative example 1
Method of manufacture the method shown in example 1 was followed except that the RH secondary refining was used for the caster chemistry was different from that used in example 1 and is shown in table 1 below.
Comparative example 2
Method of manufacture the method shown in example 1 was followed except that the RH secondary refining was used for the caster chemistry was different from that used in example 1 and is shown in table 1 below.
TABLE 1 chemical composition (wt%) of steel strips according to examples 1 to 3 of the present invention and comparative examples 1 to 2
The steel coils of examples 1 to 3 according to the present invention and comparative examples 1 to 2 were subjected to the rolling tensile property test, and the test results are shown in table 2.
TABLE 2 rolled tensile Properties of the steel strips of examples 1 to 3 according to the invention and comparative examples 1 to 2
| Examples | Yield strength R eL /MPa | Tensile strength R m /MPa |
| Example 1 | 670 | 974 |
| Example 2 | 687 | 985 |
| Example 3 | 675 | 977 |
| Comparative example 1 | 658 | 957 |
| Comparative example 2 | 664 | 962 |
| The use requirement | - | ≥950 |
The steel strips of examples 1 to 3 of the present invention and comparative examples 1 to 2 were sampled and quenched (heating temperature 840 ℃ C. + holding time 20 min), and then subjected to hardness test, and the test results are shown in Table 3.
TABLE 3 quenching hardness of Steel strips of examples 1 to 3 of the present invention and comparative examples 1 to 2
As can be seen from tables 2 and 3, the 75Cr1 saw blade steel produced by the method provided by the invention has the advantages that the tensile property and the quenching hardness meet the standard and the use requirement, and the hardness is uniformly distributed after quenching.
The above-described embodiments are only intended to illustrate the preferred embodiments of the present invention, and not to limit the scope of the present invention, and various modifications and improvements made to the technical solution of the present invention by those skilled in the art without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.
Claims (4)
1. A method for improving uneven quenching hardness of 75Cr1 saw blade steel is characterized by comprising the following steps:
(1) The smelting-continuous casting production process flow comprises the following steps: molten iron pretreatment, converter top and bottom combined blowing smelting, LF external refining, RH vacuum treatment and slab continuous casting; wherein the molten steel for casting machine comprises the following components: 0.75 to 0.80%, si:0.25 to 0.35%, mn: 0.70-0.90%, cr:0.35 to 0.65%, al: less than or equal to 0.04%, B:0.001 to 0.004 percent, less than or equal to 0.020 percent of P, less than or equal to 0.012 percent of S, and the balance of Fe and inevitable impurities;
(2) The hot rolling production process flow comprises the following steps: heating a casting blank, rough rolling, finish rolling, coiling, warehousing and slow cooling; the discharging temperature of the casting blank is 1230-1270 ℃, the rough rolling is carried out by adopting a 2-frame rolling mill, and the finish rolling is carried out by adopting a 7-frame continuous variable-crown rolling mill; the finish rolling temperature of finish rolling is 845-875 ℃, and the thickness of the hot rolled steel strip is 8mm; laminar flow cooling equipment is adopted for cooling, a post-dispersion cooling mode is adopted, and the coiling temperature is 680-720 ℃.
2. The method for improving the uneven quenching hardness of the 75Cr1 saw blade steel as claimed in claim 1, which comprises the following specific steps: carrying out desulfurization pretreatment on molten iron, carrying out decarburization and dephosphorization on the molten iron by adopting a top-bottom combined blown converter to obtain molten steel, blowing argon in the whole process of the converter smelting, adding scrap steel into the converter, and carrying out tapping temperature of the converter of 1655 ℃; the LF refining adopts large slag amount for slagging and desulfurization, and ensures that S is less than or equal to 0.012%; then, carrying out RH external refining on the molten steel smelted by the converter, and carrying out deep decarburization treatment according to the in-place components and temperature of the RH molten steel supplied by the converter; heating the plate blank at 1235 ℃ for 170min, and removing phosphorus from the heated plate blank by using high-pressure water; the width is fixed by a width fixing press, 2 frames are adopted for rough rolling, and 7 frames are adopted for CVC finish rolling; the finish rolling temperature is 845 ℃, and the thickness of a finished product is 8.0mm; and post-dispersion cooling is adopted in laminar cooling, the temperature of the steel strip is reduced to 682 ℃ for coiling, and finally the steel strip can be obtained.
3. The method for improving the uneven quenching hardness of the 75Cr1 saw blade steel as claimed in claim 1, which comprises the following specific steps: carrying out desulfurization pretreatment on molten iron, carrying out decarburization and dephosphorization on the molten iron by adopting a top-bottom combined blown converter to obtain molten steel, blowing argon in the whole process of the converter smelting, adding scrap steel into the converter, and carrying out steel tapping at the converter temperature of 1657 ℃; LF refining adopts large slag amount for slagging and desulfurizing, and ensures that S is less than or equal to 0.012%; then, carrying out RH external refining on the molten steel smelted by the converter, and carrying out deep decarburization treatment according to the in-place components and the temperature of the RH molten steel supplied by the converter; heating the plate blank at 1237 ℃ for 172min, and removing phosphorus from the heated plate blank by using high-pressure water; the width is fixed by a width fixing press, 2 frames are adopted for rough rolling, and 7 frames are adopted for CVC finish rolling; the finish rolling temperature is 847 ℃, and the thickness of a finished product is 8.0mm; and post-dispersion cooling is adopted in laminar cooling, the temperature of the steel strip is reduced to 684 ℃ for coiling, and finally the steel strip can be obtained.
4. The method for improving uneven quenching hardness of 75Cr1 saw blade steel according to claim 1, which comprises the following specific steps: carrying out desulfurization pretreatment on molten iron, carrying out decarburization and dephosphorization by adopting a top-bottom combined blowing converter to obtain molten steel, blowing argon in the whole process of converter smelting, adding scrap steel into the converter, and carrying out converter tapping at a temperature of 1653 ℃; LF refining adopts large slag amount for slagging and desulfurizing, and ensures that S is less than or equal to 0.012%; then, carrying out RH external refining on the molten steel smelted by the converter, and carrying out deep decarburization treatment according to the in-place components and the temperature of the RH molten steel supplied by the converter; heating the plate blank at 1233 ℃ for 169min, and removing phosphorus from the heated plate blank by using high-pressure water; the width is fixed by a width fixing press, 2 frames are adopted for rough rolling, and 7 frames are adopted for CVC finish rolling; the finish rolling temperature is 846 ℃, and the thickness of the finished product is 8.0mm; and post-dispersion cooling is adopted in laminar cooling, the temperature of the steel strip is reduced to 683 ℃, and coiling is carried out, so that the steel strip can be obtained.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211437673.4A CN115710677A (en) | 2022-11-15 | 2022-11-15 | Method for improving uneven quenching hardness of 75Cr1 saw blade steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211437673.4A CN115710677A (en) | 2022-11-15 | 2022-11-15 | Method for improving uneven quenching hardness of 75Cr1 saw blade steel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115710677A true CN115710677A (en) | 2023-02-24 |
Family
ID=85233539
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211437673.4A Pending CN115710677A (en) | 2022-11-15 | 2022-11-15 | Method for improving uneven quenching hardness of 75Cr1 saw blade steel |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115710677A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101745535A (en) * | 2010-01-21 | 2010-06-23 | 广州珠江钢铁有限责任公司 | Method for producing 75Cr1 hot-rolled sheet steel |
| CN110284061A (en) * | 2019-06-28 | 2019-09-27 | 邯郸钢铁集团有限责任公司 | A kind of high temperature resistant deformation 75Cr1 steel saw blade and its production technology |
| CN112375968A (en) * | 2020-10-20 | 2021-02-19 | 包头钢铁（集团）有限责任公司 | Production method of hot-rolled steel strip for drill rod of rotary drilling rig |
| CN112410685A (en) * | 2020-11-12 | 2021-02-26 | 包头钢铁（集团）有限责任公司 | Cold-rolled 980 MPa-grade quenching distribution steel and production method thereof |
| CN113061809A (en) * | 2021-03-16 | 2021-07-02 | 包头钢铁（集团）有限责任公司 | 380 MPa-level hot rolled steel strip for 2-4mm automobile structure and production method thereof |
| CN113061797A (en) * | 2021-03-16 | 2021-07-02 | 包头钢铁（集团）有限责任公司 | Improved production method of QStE420TM hot-rolled steel plate |
-
2022
- 2022-11-15 CN CN202211437673.4A patent/CN115710677A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101745535A (en) * | 2010-01-21 | 2010-06-23 | 广州珠江钢铁有限责任公司 | Method for producing 75Cr1 hot-rolled sheet steel |
| CN110284061A (en) * | 2019-06-28 | 2019-09-27 | 邯郸钢铁集团有限责任公司 | A kind of high temperature resistant deformation 75Cr1 steel saw blade and its production technology |
| CN112375968A (en) * | 2020-10-20 | 2021-02-19 | 包头钢铁（集团）有限责任公司 | Production method of hot-rolled steel strip for drill rod of rotary drilling rig |
| CN112410685A (en) * | 2020-11-12 | 2021-02-26 | 包头钢铁（集团）有限责任公司 | Cold-rolled 980 MPa-grade quenching distribution steel and production method thereof |
| CN113061809A (en) * | 2021-03-16 | 2021-07-02 | 包头钢铁（集团）有限责任公司 | 380 MPa-level hot rolled steel strip for 2-4mm automobile structure and production method thereof |
| CN113061797A (en) * | 2021-03-16 | 2021-07-02 | 包头钢铁（集团）有限责任公司 | Improved production method of QStE420TM hot-rolled steel plate |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109280847B (en) | High-carbon alloy chain tool steel and manufacturing method thereof | |
| CN106319378B (en) | Steel for large-diameter thin saw blade matrix and manufacturing method thereof | |
| CN100571971C (en) | A kind of hot rolled steel plate for punch process and preparation method thereof | |
| CN108265227B (en) | High-precision ultrathin cold-rolled steel strip for electronic components and production method thereof | |
| CN103074546B (en) | Cold-rolled strip steel for condenser tube of refrigerator and manufacturing method thereof | |
| CN108728751B (en) | IF isotropic steel for improving stamping forming and manufacturing method thereof | |
| CN113151649B (en) | Production method of low-temperature annealing cold-rolled steel plate and cold-rolled steel plate | |
| CN112430771B (en) | Cold-rolled steel plate for precision stamping high-speed cutting chain saw blade and manufacturing method thereof | |
| CN111411311A (en) | Steel for die casting corrosion-resistant chain plate and manufacturing method thereof | |
| CN114525449A (en) | DC04 automobile steel plate for cold rolling deep drawing and manufacturing method thereof | |
| CN111549274A (en) | Wear-resistant Nb-containing chain plate hot-rolled steel strip and manufacturing method thereof | |
| CN111235463B (en) | Hot-rolled pickled steel strip for 450 MPa-grade oil well pipe and manufacturing method thereof | |
| CN109694983B (en) | High-mirror-surface corrosion-resistant plastic die steel and manufacturing method thereof | |
| CN103589850B (en) | Manufacturing method for scale breaking tension leveler working roll | |
| CN110079733B (en) | Ultra-thin ultra-high strength medium carbon bainite steel and manufacturing method thereof | |
| CN109047692B (en) | Ultrathin high-strength steel plate capable of being used at-60 ℃ and manufacturing method thereof | |
| CN112501513B (en) | Low-carbon acid-pickled steel with excellent formability and surface quality and production method thereof | |
| CN113151651B (en) | Production method of low-temperature annealed ultra-deep drawn cold-rolled steel plate and cold-rolled steel plate | |
| CN115710677A (en) | Method for improving uneven quenching hardness of 75Cr1 saw blade steel | |
| CN110055476B (en) | Low-phosphorus sulfur rare earth alloy steel for cold stamping type nut one-step forming die and preparation method thereof | |
| CN113564474A (en) | Steel plate with yield strength not less than 550MPa and low yield ratio for large-scale petroleum storage tank and production method thereof | |
| CN113578963A (en) | Method for producing thin 45 steel by continuous casting and rolling production line | |
| CN114540700A (en) | Cold-rolled steel plate for precision stamping chain saw guide plate with tensile strength of 1050MPa | |
| CN107419175B (en) | Economical tool steel with good fatigue life and production method thereof | |
| CN111979470A (en) | Production method of ultrahigh-strength cold-rolled martensite steel plate with good bending property |
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 |