CN113249651A - Gear steel bar material with controlled rolling and high-temperature tempering - Google Patents
Gear steel bar material with controlled rolling and high-temperature tempering Download PDFInfo
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- CN113249651A CN113249651A CN202110472801.8A CN202110472801A CN113249651A CN 113249651 A CN113249651 A CN 113249651A CN 202110472801 A CN202110472801 A CN 202110472801A CN 113249651 A CN113249651 A CN 113249651A
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- 238000005096 rolling process Methods 0.000 title claims abstract description 35
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 31
- 239000010959 steel Substances 0.000 title claims abstract description 31
- 238000005496 tempering Methods 0.000 title claims abstract description 23
- 239000000463 material Substances 0.000 title claims description 9
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 8
- 239000012535 impurity Substances 0.000 claims abstract description 7
- 238000010438 heat treatment Methods 0.000 claims description 28
- 238000001514 detection method Methods 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 11
- 238000004519 manufacturing process Methods 0.000 claims description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 8
- 238000004321 preservation Methods 0.000 claims description 7
- 230000007547 defect Effects 0.000 claims description 5
- 238000002360 preparation method Methods 0.000 claims description 3
- 238000010273 cold forging Methods 0.000 description 8
- 238000000137 annealing Methods 0.000 description 6
- 238000005242 forging Methods 0.000 description 4
- 229910045601 alloy Inorganic materials 0.000 description 3
- 239000000956 alloy Substances 0.000 description 3
- 229910001563 bainite Inorganic materials 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 229910001562 pearlite Inorganic materials 0.000 description 2
- 229910000859 α-Fe Inorganic materials 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 1
- 229910000954 Medium-carbon steel Inorganic materials 0.000 description 1
- 229910000746 Structural steel Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000005261 decarburization Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000001953 recrystallisation Methods 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- 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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/002—Heat treatment of ferrous alloys containing Cr
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/005—Heat treatment of ferrous alloys containing Mn
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/008—Heat treatment of ferrous alloys containing Si
-
- 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
- C21D8/06—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
- C21D8/065—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires of ferrous alloys
-
- 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
- C21D9/0075—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for rods of limited length
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—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
- C21D2211/009—Pearlite
Abstract
The invention discloses a controlled rolling and high temperature tempering gear steel bar which comprises the following components in percentage by weight: c: 0.15-0.25%, Mn: 1.00-1.50%, Si is less than or equal to 0.35%, P is less than or equal to 0.030%, S is less than or equal to 0.030%, Cr: 1.00-1.50%, Al: 0.010-0.045%, and the balance of Fe and inevitable impurities.
Description
Technical Field
The invention relates to a controlled rolling and high temperature tempering gear steel bar, in particular to a controlled rolling and high temperature tempering gear steel bar with good structure uniformity and purity.
Background
Cold forging is a forming process in which the material is recrystallized at a temperature lower than or equal to the recrystallization temperature, and is forging at a temperature lower than or equal to the recovery temperature. Forging without heating the blank is conventionally referred to as cold forging in production. The cold forging materials are mostly aluminum and partial alloy, copper and partial alloy, low carbon steel, medium carbon steel and low alloy structural steel which have small deformation resistance and good plasticity at room temperature. The cold forging piece has good surface quality and high dimensional precision, and can replace some cutting processing. The cold forging can strengthen the metal and improve the strength of the parts.
At present, gear steel used for cold precision forging needs spheroidizing annealing or isothermal annealing treatment before cold forging, but the spheroidizing annealing or isothermal annealing requires long treatment time and has higher cost.
Disclosure of Invention
The purpose of the invention is as follows: the invention aims to provide a controlled rolling and high temperature tempering gear steel bar, which solves the problems of long cycle and high cost of the existing spheroidizing annealing or isothermal annealing.
The technical scheme is as follows: the controlled rolling and high temperature tempering gear steel bar comprises the following components in percentage by weight: c: 0.15-0.25%, Mn: 1.00-1.50%, Si is less than or equal to 0.35%, P is less than or equal to 0.030%, S is less than or equal to 0.030%, Cr: 1.00-1.50%, Al: 0.010-0.045%, and the balance of Fe and inevitable impurities.
A preparation method of a controlled rolling and high temperature tempering gear steel bar comprises the following steps:
step 1: cogging and heating the gear steel bar;
step 2: cogging and dephosphorization;
and step 3: rolling and heating by two flames;
and 4, step 4: rolling with two heats for dephosphorization;
and 5: the finishing temperature;
step 6: high-temperature tempering;
and 7: ultrasonic flaw detection and magnetic leakage flaw detection.
Further, in the step 1, the cogging heating temperature is as follows: 950 plus 1270 ℃, and the total heating time of cogging heating is more than or equal to 240 min.
Further, in the step 2, high-pressure water descaling is adopted for cogging and dephosphorization, and the pressure is more than or equal to 13 MPa.
Further, in the step 3, the heating temperature of the two-fire rolling is 980-1240 ℃, and the total heating time is more than or equal to 180 min.
Further, in the step 4, the two-fire rolling dephosphorization adopts high-pressure water descaling, and the pressure is more than or equal to 13 MPa.
Further, in the step 5, the finishing temperature is less than or equal to 1000 ℃.
Further, in the step 6, the high-temperature tempering is performed by using a roller hearth type continuous furnace at the temperature of 620-680 ℃, and the heat preservation time of the high-temperature section is set, wherein the heat preservation time of the high-temperature section is not less than 2 h.
Further, in the step 7, the ultrasonic flaw detection precision meets the A-level requirement of GB4162, and the depth of the surface defect is less than or equal to 0.30 mm.
Further, the bar material for the gear steel used in the step 1 comprises the following components in percentage by weight:
c: 0.20%, Mn: 1.25%, Si: 0.11%, P: 0.010%, S: 0.005%, Cr: 1.13%, Al: 0.021%, and the balance of Fe and inevitable impurities.
Has the advantages that: compared with the prior art, the invention has the following remarkable advantages: 1. the tissue uniformity and the purity are good; 2. the structure is ferrite and pearlite, the bainite content is less than or equal to 3 percent, the purity K3 of steel is less than or equal to 20 percent, the hardness is less than or equal to 180HBW, the hardness dispersion is less than or equal to 20HBW, the surface defect depth is less than or equal to 0.30mm, and the surface decarburized layer is less than or equal to 0.40 mm; 3. has excellent cold forging performance and use performance.
Drawings
FIG. 1 is a metallographic structure drawing after high temperature tempering according to the present invention;
FIG. 2 is a depth map of the surface decarburization layer of the present invention.
Detailed Description
The technical scheme of the invention is further explained by combining the attached drawings.
As shown in fig. 1 and fig. 2, the controlled rolling and high temperature tempering gear steel bar material according to the embodiment comprises the following components by weight percent: c: 0.15-0.25%, Mn: 1.00-1.50%, Si is less than or equal to 0.35%, P is less than or equal to 0.030%, S is less than or equal to 0.030%, Cr: 1.00-1.50%, Al: 0.010-0.045%, and the balance of Fe and inevitable impurities.
A preparation method of a controlled rolling and high temperature tempering gear steel bar comprises the following steps:
step 1: cogging and heating the gear steel bar; step 2: cogging and dephosphorization; and step 3: rolling and heating by two flames; and 4, step 4: rolling with two heats for dephosphorization; and 5: the finishing temperature; step 6: high-temperature tempering; and 7: ultrasonic flaw detection and magnetic leakage flaw detection.
In step 1, the cogging heating temperature is as follows: 950 plus 1270 ℃, and the total heating time of cogging heating is more than or equal to 240 min.
In the step 2, high-pressure water descaling is adopted for cogging and dephosphorization, and the pressure is more than or equal to 13 MPa.
In the step 3, the heating temperature of the two-fire rolling is 980-1240 ℃, and the total heating time is more than or equal to 180 min.
In the step 4, the two-fire rolling dephosphorization adopts high-pressure water descaling, and the pressure is more than or equal to 13 MPa.
In step 5, the finishing temperature is less than or equal to 1000 ℃.
In the step 6, the high-temperature tempering adopts a roller-hearth continuous furnace, the temperature is 620-680 ℃, and the heat preservation time of a high-temperature section is set, wherein the heat preservation time of the high-temperature section is not less than 2 h.
In step 7, the ultrasonic flaw detection precision meets the A-grade requirement of GB4162, and the depth of the surface defect is less than or equal to 0.30 mm.
The bar material for the gear steel used in the step 1 comprises the following components in percentage by weight:
c: 0.20%, Mn: 1.25%, Si: 0.11%, P: 0.010%, S: 0.005%, Cr: 1.13%, Al: 0.021%, and the balance of Fe and inevitable impurities.
Example 1
In the present example, the steel bar for gear steel for cold forging having a diameter of 20 to 80mm was used, and the following table 1 (unit:%):
TABLE 1
| C | Si | Mn | P | S | Cr | Al | H | O |
| 0.20 | 0.11 | 1.25 | 0.010 | 0.005 | 1.13 | 0.021 | 0.00012 | 0.0008 |
The embodiment of the embodiment is carried out according to the following process:
step 1: cogging and heating: cogging heating temperature: 950 plus material at 1270 deg.c, total heating time not less than 240 min;
step 2: cogging and dephosphorization: descaling by adopting high-pressure water, wherein the pressure is more than or equal to 13 MPa;
and step 3: rolling and heating with two heats: heating temperature of two-fire rolling: 980-1240 ℃, and the total heating time is more than or equal to 180 min;
and 4, step 4: and (3) rolling with two heats for dephosphorization: descaling by adopting high-pressure water, wherein the pressure is more than or equal to 13 MPa;
and 5: the finishing temperature is as follows: the finishing temperature is less than or equal to 1000 ℃;
step 6: high-temperature tempering: high-temperature tempering is carried out in a roller hearth type continuous furnace, wherein the high-temperature tempering temperature is 620-680 ℃, and the heat preservation time of a high-temperature section is more than or equal to 2 hours;
and 7: ultrasonic flaw detection and magnetic flux leakage flaw detection: the ultrasonic flaw detection precision meets the A-grade requirement of GB4162, and the depth of the surface defect is less than or equal to 0.30 mm.
The examples of tissue type, purity, hardness, and decarburized layer depth were selected as follows:
the structure is ferrite and pearlite, the bainite content is less than or equal to 3 percent, and the structure is shown in figure 1.
Steel purity K3: 8.
the hardness after high temperature tempering is 160HBW, and the hardness dispersion is 15 HBW.
The surface decarburized layer is 0.35mm, see figure 2.
According to the properties, the bar can completely meet the cold precision forging requirements of downstream customers, and after the customer cold forges the gear, the bar has good properties and completely meets the use requirements.
Claims (10)
1. The controlled rolling and high temperature tempering gear steel bar is characterized by comprising the following components in percentage by weight: c: 0.15-0.25%, Mn: 1.00-1.50%, Si is less than or equal to 0.35%, P is less than or equal to 0.030%, S is less than or equal to 0.030%, Cr: 1.00-1.50%, Al: 0.010-0.045%, and the balance of Fe and inevitable impurities.
2. A preparation method of a controlled rolling and high temperature tempering gear steel bar is characterized by comprising the following steps: the method comprises the following steps:
step 1: cogging and heating the gear steel bar;
step 2: cogging and dephosphorization;
and step 3: rolling and heating by two flames;
and 4, step 4: rolling with two heats for dephosphorization;
and 5: the finishing temperature;
step 6: high-temperature tempering;
and 7: ultrasonic flaw detection and magnetic leakage flaw detection.
3. The method of manufacturing a controlled rolling and high temperature tempered gear steel bar according to claim 2, wherein the method comprises the steps of: in the step 1, the cogging heating temperature is as follows: 950 plus 1270 ℃, and the total heating time of cogging heating is more than or equal to 240 min.
4. The method of manufacturing a controlled rolling and high temperature tempered gear steel bar according to claim 2, wherein the method comprises the steps of: in the step 2, high-pressure water descaling is adopted for cogging and dephosphorization, and the pressure is more than or equal to 13 MPa.
5. The method of manufacturing a controlled rolling and high temperature tempered gear steel bar according to claim 2, wherein the method comprises the steps of: in the step 3, the heating temperature of the two-fire rolling is 980-1240 ℃, and the total heating time is more than or equal to 180 min.
6. The method of manufacturing a controlled rolling and high temperature tempered gear steel bar according to claim 2, wherein the method comprises the steps of: in the step 4, the two-fire rolling dephosphorization adopts high-pressure water descaling, and the pressure is more than or equal to 13 MPa.
7. The method of manufacturing a controlled rolling and high temperature tempered gear steel bar according to claim 2, wherein the method comprises the steps of: in the step 5, the finishing temperature is less than or equal to 1000 ℃.
8. The method of manufacturing a controlled rolling and high temperature tempered gear steel bar according to claim 2, wherein the method comprises the steps of: in the step 6, the high-temperature tempering is performed by a roller hearth type continuous furnace at the temperature of 620-680 ℃, and the heat preservation time of a high-temperature section is set, wherein the heat preservation time of the high-temperature section is not less than 2 h.
9. The method of manufacturing a controlled rolling and high temperature tempered gear steel bar according to claim 2, wherein the method comprises the steps of: in the step 7, the ultrasonic flaw detection precision meets the A-grade requirement of GB4162, and the depth of the surface defect is less than or equal to 0.30 mm.
10. The method of manufacturing a controlled rolling and high temperature tempered gear steel bar according to claim 2, wherein the method comprises the steps of: the bar material for the gear steel used in the step 1 comprises the following components in percentage by weight:
c: 0.20%, Mn: 1.25%, Si: 0.11%, P: 0.010%, S: 0.005%, Cr: 1.13%, Al: 0.021%, and the balance of Fe and inevitable impurities.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110472801.8A CN113249651A (en) | 2021-04-29 | 2021-04-29 | Gear steel bar material with controlled rolling and high-temperature tempering |
| PCT/CN2021/096016 WO2022227160A1 (en) | 2021-04-29 | 2021-05-26 | Gear steel bar with controlled rolling and high-temperature tempering |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110472801.8A CN113249651A (en) | 2021-04-29 | 2021-04-29 | Gear steel bar material with controlled rolling and high-temperature tempering |
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| CN113249651A true CN113249651A (en) | 2021-08-13 |
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| CN202110472801.8A Pending CN113249651A (en) | 2021-04-29 | 2021-04-29 | Gear steel bar material with controlled rolling and high-temperature tempering |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN113249651A (en) |
| WO (1) | WO2022227160A1 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113817951A (en) * | 2021-08-23 | 2021-12-21 | 南京钢铁股份有限公司 | Production process of continuous casting gear steel bar for rail transit |
| CN114164330A (en) * | 2021-12-02 | 2022-03-11 | 南京钢铁股份有限公司 | Heat treatment method of gear steel 20MnCr5 |
| CN114892071A (en) * | 2022-04-07 | 2022-08-12 | 江阴兴澄特种钢铁有限公司 | High-temperature carburized gear steel for new energy vehicle and manufacturing method |
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| CN1058997A (en) * | 1991-09-03 | 1992-02-26 | 西宁钢厂 | Unhardened and untempered low carbon steel with high strength and toughness |
| CN102367549A (en) * | 2011-11-09 | 2012-03-07 | 南京钢铁股份有限公司 | Bar for large wind driven generator gear and manufacturing method of bar |
| CN102703834A (en) * | 2012-06-29 | 2012-10-03 | 中天钢铁集团有限公司 | Grain-refined gear steel and production process thereof |
| CN110616381A (en) * | 2019-10-11 | 2019-12-27 | 南京钢铁股份有限公司 | Austenite grain size refinement control method of high-temperature carburized gear steel |
| CN112222204A (en) * | 2020-09-04 | 2021-01-15 | 中天钢铁集团有限公司 | Rolling method of steel for engine non-quenched and tempered connecting rod and manufacturing method of forge piece |
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| JP4102866B2 (en) * | 2001-04-16 | 2008-06-18 | ジヤトコ株式会社 | Gear manufacturing method |
| JP6769491B2 (en) * | 2016-10-05 | 2020-10-14 | 日本製鉄株式会社 | Nitriding parts and their manufacturing methods |
| CN107828957A (en) * | 2017-09-27 | 2018-03-23 | 无锡宝露重工有限公司 | A kind of Technology for Heating Processing of the carburizing steel gear forgingses of 18C,rNi,Mo7 6 |
| CN110952022A (en) * | 2019-10-31 | 2020-04-03 | 宝钢特钢长材有限公司 | Narrow-hardenability high-temperature fine-grain MnCr gear steel and preparation method thereof |
| CN111945070B (en) * | 2020-08-19 | 2022-03-08 | 宝钢特钢韶关有限公司 | Narrow-hardenability gear steel and preparation method thereof |
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2021
- 2021-04-29 CN CN202110472801.8A patent/CN113249651A/en active Pending
- 2021-05-26 WO PCT/CN2021/096016 patent/WO2022227160A1/en active Application Filing
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1058997A (en) * | 1991-09-03 | 1992-02-26 | 西宁钢厂 | Unhardened and untempered low carbon steel with high strength and toughness |
| CN102367549A (en) * | 2011-11-09 | 2012-03-07 | 南京钢铁股份有限公司 | Bar for large wind driven generator gear and manufacturing method of bar |
| CN102703834A (en) * | 2012-06-29 | 2012-10-03 | 中天钢铁集团有限公司 | Grain-refined gear steel and production process thereof |
| CN110616381A (en) * | 2019-10-11 | 2019-12-27 | 南京钢铁股份有限公司 | Austenite grain size refinement control method of high-temperature carburized gear steel |
| CN112222204A (en) * | 2020-09-04 | 2021-01-15 | 中天钢铁集团有限公司 | Rolling method of steel for engine non-quenched and tempered connecting rod and manufacturing method of forge piece |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113817951A (en) * | 2021-08-23 | 2021-12-21 | 南京钢铁股份有限公司 | Production process of continuous casting gear steel bar for rail transit |
| CN114164330A (en) * | 2021-12-02 | 2022-03-11 | 南京钢铁股份有限公司 | Heat treatment method of gear steel 20MnCr5 |
| CN114892071A (en) * | 2022-04-07 | 2022-08-12 | 江阴兴澄特种钢铁有限公司 | High-temperature carburized gear steel for new energy vehicle and manufacturing method |
| CN114892071B (en) * | 2022-04-07 | 2023-10-24 | 江阴兴澄特种钢铁有限公司 | High-temperature carburized gear steel for new energy vehicle and manufacturing method |
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| Publication number | Publication date |
|---|---|
| WO2022227160A1 (en) | 2022-11-03 |
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Application publication date: 20210813 |