CN114160571A - Production method of low-hardness 42CrMo steel - Google Patents
Production method of low-hardness 42CrMo steel Download PDFInfo
- Publication number
- CN114160571A CN114160571A CN202111419751.3A CN202111419751A CN114160571A CN 114160571 A CN114160571 A CN 114160571A CN 202111419751 A CN202111419751 A CN 202111419751A CN 114160571 A CN114160571 A CN 114160571A
- Authority
- CN
- China
- Prior art keywords
- rolling
- steel
- steel billet
- temperature
- cooling
- 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
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 72
- 239000010959 steel Substances 0.000 title claims abstract description 72
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 14
- 238000005096 rolling process Methods 0.000 claims abstract description 64
- 238000001816 cooling Methods 0.000 claims abstract description 41
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 32
- 238000010438 heat treatment Methods 0.000 claims abstract description 31
- 238000000034 method Methods 0.000 claims abstract description 11
- 239000000126 substance Substances 0.000 claims abstract description 7
- 238000004513 sizing Methods 0.000 claims abstract description 5
- 239000012535 impurity Substances 0.000 claims abstract description 4
- 238000002791 soaking Methods 0.000 claims description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 239000011572 manganese Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 229910001562 pearlite Inorganic materials 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000005098 hot rolling Methods 0.000 description 2
- 229910000734 martensite Inorganic materials 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 238000011089 mechanical engineering Methods 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/02—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling heavy work, e.g. ingots, slabs, blooms, or billets, in which the cross-sectional form is unimportant ; Rolling combined with forging or pressing
- B21B1/026—Rolling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B3/00—Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences ; Rolling of aluminium, copper, zinc or other non-ferrous metals
- B21B3/02—Rolling special iron alloys, e.g. stainless steel
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
- B21B45/0203—Cooling
- B21B45/0209—Cooling devices, e.g. using gaseous coolants
- B21B45/0215—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes
-
- 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
- C21D8/005—Modifying the physical properties by deformation combined with, or followed by, heat treatment of ferrous alloys
-
- 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
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
-
- 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
- C22C38/54—Ferrous alloys, e.g. steel alloys containing chromium with nickel with boron
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2261/00—Product parameters
- B21B2261/20—Temperature
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
The production method of the low-hardness 42CrMo steel comprises the following chemical components, by mass, 0.40% -0.42% of C, 0.22% -0.26% of Si, 0.65% -0.70% of Mn, 1.06% -1.11% of Cr, 0.16% -0.22% of Mn, 0.01% -0.015% of S, 0.01% -0.02% of P, 0.2% -0.3% of Ni and the balance of Fe and inevitable impurities; the method comprises the following process steps: (1) heating the steel billet by a heating furnace; (2) sending the steel billet into a rough and medium rolling mill unit for rough rolling, medium rolling and pre-finish rolling; (3) feeding the steel billet into a finish rolling water cooling section, controlling the temperature to be 800-820 ℃, and controlling the flow rate of a water tank to be 0-200 m 3/h; (4) the billet is sent to a KOCKS reducing sizing mill set for rolling; (5) sending the steel billet into a KOCKS water cooling section, controlling the temperature of an upper cooling bed to be 760-780 ℃, and controlling the flow of a water tank to be 0-200 m 3/h; (6) and cooling the steel billet on a cooling bed at a cooling speed of 0.2-0.3 ℃/s. The invention better solves the problem that the hardness of the 42CrMo steel core is higher.
Description
Technical Field
The invention belongs to the technical field of metallurgy, and relates to a production method of low-hardness 42CrMo steel.
Background
The 42CrMo is used as a common steel grade for mechanical engineering, and has high strength and toughness and good hardenability. However, in actual production, the conditions that a large amount of martensite structures exist in the 42CrMo steel core part and the hardness is higher are not solved all the time, and the subsequent processing performance of the material is seriously influenced. Is an advanced steel rolling technology which saves alloy, simplifies the working procedure and saves energy consumption. Because it has the comprehensive action of deformation strengthening and phase change strengthening, it can raise steel strength and can improve toughness and plasticity of steel material.
Chinese patent CN 112501512A discloses a rolling-control cooling-control high-strength pearlite steel rail and a production method thereof, wherein the steel rail comprises the following chemical components, by mass, 0.71-0.85% of C, 0.45-0.70% of Si, 0.35-0.70% of Mn, 0.2-1.0% of Cr, 0.05-0.1% of V, 0.005-0.08% of Nb, 0-0.025% of P, 0-0.015% of S, and the balance of Fe and inevitable impurities; the tensile strength of the steel rail is more than or equal to 1360MPa, the elongation is more than or equal to 12 percent, the tread hardness of the rail head is more than or equal to 390HB, the depth of a hardened layer is more than or equal to 30mm, the structure is fine lamellar pearlite, and the spacing between pearlite lamellae at the position which is 30mm away from the surface of the steel rail is less than or equal to 90 nm. Can improve the strength and the hardness of the steel rail and simultaneously keep good toughness and plasticity.
Chinese patent CN 111389905A discloses a bar temperature and rolling control process technology, which comprises the following steps: heating the steel billet by a heating furnace to raise the temperature of the steel billet to 1000-1030 ℃; sending the steel billet into a rough and medium rolling mill set, and carrying out rough rolling and medium rolling on the steel billet which is heated in the step S1; the steel billet in the S2 is sent to a pre-water penetration device, the temperature of the steel billet is controlled to be 1000-1020 ℃, and the temperature rise and coarse crystal grains are prevented after multi-pass rolling deformation of a coarse and medium rolling mill set, so that the physical properties of the product are changed; sending the steel billet in the S3 to a finishing mill group for finish rolling; straightening the steel billet subjected to the finish rolling by a six-roller or eight-roller straightener; and sending the straightened steel billet into a scattered coil air cooling conveying roller way for air cooling. The method has the advantages that under the condition that the product performance is qualified, the content of silicon and manganese elements in steel is reduced, so that the production cost is reduced, the initial rolling temperature is reduced, the gas consumption is reduced, and the production cost is saved.
In actual production, the conditions that a large amount of martensite structures exist in the 42CrMo steel core part and the hardness is higher are not solved all the time, and the subsequent processing performance of the material is seriously influenced.
Disclosure of Invention
The invention aims to provide a production method of 42CrMo steel with low hardness, particularly hardness less than 260HB, and solve the problem that the hardness of the core part of the 42CrMo steel is higher.
The technical scheme of the invention is as follows:
the production method of the low-hardness 42CrMo steel comprises the following chemical components, by mass, 0.40% -0.42% of C, 0.22% -0.26% of Si, 0.65% -0.70% of Mn, 1.06% -1.11% of Cr, 0.16% -0.22% of Mn, 0.01% -0.015% of S, 0.01% -0.02% of P, 0.2% -0.3% of Ni and the balance of Fe and inevitable impurities; the method comprises the following process steps:
(1) heating the steel billet by a heating furnace, wherein the steel billet is heated for 10-15 min at 600-750 ℃ in a preheating section, for 35-40 min at 1020-1080 ℃ in a heating section, for 35-40 min at 1130-1170 ℃ in a heating section, and for 35-40 min at 1100-1140 ℃ in a soaking section;
(2) sending the steel billet into a rough and medium rolling mill unit for rough rolling, medium rolling and pre-finish rolling, wherein the temperature for rough rolling is 1000-1030 ℃, the temperature for medium rolling is 970-990 ℃, and the temperature for pre-finish rolling is 930-950 ℃;
(3) feeding the steel billet into a finish rolling water cooling section, controlling the temperature to be 800-820 ℃, and controlling the flow rate of a water tank to be 0-200 m 3/h;
(4) the billet is sent to a KOCKS reducing sizing mill set for rolling;
(5) sending the steel billet into a KOCKS water cooling section, controlling the temperature of an upper cooling bed to be 760-780 ℃, and controlling the flow of a water tank to be 0-200 m 3/h; (6) and cooling the steel billet on a cooling bed at a cooling speed of 0.2-0.3 ℃/s.
The invention has the beneficial effects that: the heating furnace 4 sections are accurately heated, so that the temperature difference between the inside and the outside of the steel billet and the temperature difference of the section of the steel billet are increased and then reduced along with the heating time, the heating temperature is accurately controlled to meet the requirement of a heating process, and the energy consumption can be reduced; the temperature of rough rolling, intermediate rolling and pre-finish rolling is controlled, so that the generation of secondary iron scale is avoided, and the cost is saved; the two water cooling sections can be freely controlled to obtain the temperature meeting the requirements.
Drawings
FIG. 1 is a 500x side structural metallographic diagram of a low-hardness 42CrMo steel cross section.
FIG. 2 is a metallographic picture of a 500x radius half structure of a low-hardness 42CrMo steel cross section.
FIG. 3 is a metallographic structure of a 500x area of a low-hardness 42CrMo steel cross section.
Detailed Description
The invention will be further described with reference to examples of embodiments of the invention.
Example 1: a method for producing a controlled rolling and controlled cooling hot rolling 42CrMo steel with low hardness, the chemical composition of the steel is shown in Table 1, and the process steps comprise:
(1) heating the steel billet by a heating furnace, wherein the heating furnace is divided into 4 stages, the temperature interval and the heating time are respectively heating for 15min at 600 ℃ in a preheating section, 40min at 1020 ℃ in a first heating section, 40min at 1170 ℃ in a second heating section and 40min at 1140 ℃ in a soaking section;
(2) sending the steel billet into a rough and medium rolling mill set, and carrying out rough rolling, medium rolling and pre-finish rolling on the heated steel billet;
(3) feeding the steel billet into a finishing rolling water cooling section, and controlling the temperature to be 820 ℃; the rough rolling includes 3 stands 850 and 750 stands, the medium rolling includes 3 stands 750 and 550 stands, and the pre-finish rolling includes 4 stands 450. The temperature for rough rolling is 1000 ℃, the temperature for medium rolling is 970 ℃, and the temperature for pre-finish rolling is 930 ℃;
(4) the billet is sent to a KOCKS reducing sizing mill set for rolling;
(5) sending the steel billet into a KOCKS water cooling section, and controlling the temperature of an upper cooling bed to be 780 ℃; the water-cooling section contains 3 water tanks, and every water tank contains 7 cooling nozzle, and water tank nozzle can be selected and close as required, and water tank flow control is 0~200m3/h；
(6) The steel billet is cooled on a cooling bed, the cooling mode of the cooling bed is close-packed, and the cooling speed is 0.2 ℃/s.
Example 2: a method for producing a controlled rolling and controlled cooling hot rolling 42CrMo steel with low hardness, the chemical composition of the steel is shown in Table 1, and the process steps comprise:
(1) heating the steel billet by a heating furnace to raise the temperature of the steel billet to 1120 ℃; the heating furnace is divided into 4 stages, the temperature interval and the heating time are respectively a preheating stage for heating for 15min at 600 ℃, a first stage for heating for 40min at 1020 ℃, a second stage for heating for 40min at 1170 ℃, and a soaking stage for heating for 40min at 1140 ℃;
(2) sending the steel billet into a rough and medium rolling mill unit, and carrying out rough rolling, medium rolling and pre-finish rolling on the steel billet which is heated in the step S1; the rough rolling includes 3 stands 850 and 750 stands, the medium rolling includes 3 stands 750 and 550 stands, and the pre-finish rolling includes 4 stands 450. The temperature for rough rolling is 1000 ℃, the temperature for medium rolling is 970 ℃, and the temperature for pre-finish rolling is 930 ℃;
(3) and (3) feeding the steel billet into a finishing rolling water cooling section, and controlling the temperature to be 820 ℃. The finish rolling water cooling section in S3 contains 4 water tanks, and each water tank contains 7 coolingThe nozzle is touched, the water tank and the water tank nozzle can be selected and closed according to requirements, and the flow of the water tank is adjusted to be 0-200 m3/h；
(4) The billet is sent to a KOCKS reducing sizing mill set for rolling;
(5) the steel billet is sent into a KOCKS water cooling section, and the temperature of an upper cooling bed is controlled to be 760 ℃. The water-cooling section contains 3 water tanks, and every water tank contains 7 cooling nozzle, and water tank nozzle can be selected and close as required, and water tank flow control is 0~200m3/h；
(6) And cooling the steel billets on a cooling bed in a close-packed manner at a cooling speed of 0.2 ℃/s.
Table 1 examples chemical composition in mass percent (%)
TABLE 2 section Hardness (HB) of examples
The section hardness indexes of the samples of the steels produced in examples 1 and 2 are shown in table 2. It can be seen that the 42CrMo steel obtained by the invention has hardness of < 260 HB.
Claims (1)
1. A production method of low-hardness 42CrMo steel is characterized by comprising the following steps: the steel comprises the following chemical components, by mass, 0.40% -0.42% of C, 0.22% -0.26% of Si, 0.65% -0.70% of Mn, 1.06% -1.11% of Cr, 0.16% -0.22% of Mn, 0.01% -0.015% of S, 0.01% -0.02% of P, 0.2% -0.3% of Ni and the balance of Fe and inevitable impurities; the method comprises the following process steps:
(1) heating the steel billet by a heating furnace, wherein the steel billet is heated for 10-15 min at 600-750 ℃ in a preheating section, for 35-40 min at 1020-1080 ℃ in a heating section, for 35-40 min at 1130-1170 ℃ in a heating section, and for 35-40 min at 1100-1140 ℃ in a soaking section;
(2) sending the steel billet into a rough and medium rolling mill unit for rough rolling, medium rolling and pre-finish rolling, wherein the temperature for rough rolling is 1000-1030 ℃, the temperature for medium rolling is 970-990 ℃, and the temperature for pre-finish rolling is 930-950 ℃;
(3) feeding the steel billet into a finish rolling water cooling section, controlling the temperature to be 800-820 ℃, and controlling the flow rate of a water tank to be 0-200 m 3/h;
(4) the billet is sent to a KOCKS reducing sizing mill set for rolling;
(5) sending the steel billet into a KOCKS water cooling section, controlling the temperature of an upper cooling bed to be 760-780 ℃, and controlling the flow of a water tank to be 0-200 m 3/h;
(6) and cooling the steel billet on a cooling bed at a cooling speed of 0.2-0.3 ℃/s.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111419751.3A CN114160571A (en) | 2021-11-26 | 2021-11-26 | Production method of low-hardness 42CrMo steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111419751.3A CN114160571A (en) | 2021-11-26 | 2021-11-26 | Production method of low-hardness 42CrMo steel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114160571A true CN114160571A (en) | 2022-03-11 |
Family
ID=80480898
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111419751.3A Pending CN114160571A (en) | 2021-11-26 | 2021-11-26 | Production method of low-hardness 42CrMo steel |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114160571A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115069781A (en) * | 2022-06-06 | 2022-09-20 | 福建三宝钢铁有限公司 | Controlled rolling and controlled cooling production process of HRB400E nuclear power steel |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1244360A (en) * | 1967-11-11 | 1971-09-02 | Daimler Benz Ag | Improvements in or relating to steel |
| CN103710609A (en) * | 2013-12-12 | 2014-04-09 | 山西新泰钢铁有限公司 | High-quality high-strength cold heading steel and production method thereof |
| CN107042234A (en) * | 2017-03-15 | 2017-08-15 | 中冶华天工程技术有限公司 | The intelligent production line and production method gathered based on bar whole process big data |
| CN110918642A (en) * | 2019-10-30 | 2020-03-27 | 邯郸钢铁集团有限责任公司 | Production control method for improving bending degree of 42CrMo bar |
| CN113245365A (en) * | 2021-05-12 | 2021-08-13 | 大冶特殊钢有限公司 | Rolling production method for improving toughness of steel products on line |
-
2021
- 2021-11-26 CN CN202111419751.3A patent/CN114160571A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1244360A (en) * | 1967-11-11 | 1971-09-02 | Daimler Benz Ag | Improvements in or relating to steel |
| CN103710609A (en) * | 2013-12-12 | 2014-04-09 | 山西新泰钢铁有限公司 | High-quality high-strength cold heading steel and production method thereof |
| CN107042234A (en) * | 2017-03-15 | 2017-08-15 | 中冶华天工程技术有限公司 | The intelligent production line and production method gathered based on bar whole process big data |
| CN110918642A (en) * | 2019-10-30 | 2020-03-27 | 邯郸钢铁集团有限责任公司 | Production control method for improving bending degree of 42CrMo bar |
| CN113245365A (en) * | 2021-05-12 | 2021-08-13 | 大冶特殊钢有限公司 | Rolling production method for improving toughness of steel products on line |
Non-Patent Citations (1)
| Title |
|---|
| 周光理等: "42CrMo合金钢棒材硬度及显微组织控制", 理化检验-物理分册, vol. 57, no. 8, pages 15 - 20 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115069781A (en) * | 2022-06-06 | 2022-09-20 | 福建三宝钢铁有限公司 | Controlled rolling and controlled cooling production process of HRB400E nuclear power steel |
| CN115069781B (en) * | 2022-06-06 | 2024-04-12 | 福建三宝钢铁有限公司 | Rolling and cooling control production process of HRB400E nuclear power steel |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107354385B (en) | A kind of preparation method of automobile superhigh-strength hot forming steel | |
| CN102080192B (en) | Low-yield ratio, high-plasticity, ultrafine-grain and high-strength steel and manufacturing method thereof | |
| CN113416818B (en) | Heat treatment process of high-strength and high-toughness bainite/martensite multiphase bainite steel rail | |
| CN106868398A (en) | 1300MPa grades of ultra-fine grained ferrite/low temperature bainite dual-phase steel and preparation method thereof | |
| CN103343281A (en) | Lamellar double-phase high-strength and high-toughness steel and preparation method thereof | |
| CN102286695A (en) | High-plasticity high-toughness and ultra-high-intensity steel plate and production method thereof | |
| CN112063921B (en) | Air-cooled hardened steel plate with ultrahigh-strength high-toughness ultrafine structure and preparation process thereof | |
| CN113528944B (en) | 1000MPa easily-formed wear-resistant steel plate and preparation method thereof | |
| CN111485086A (en) | Controlled rolling and cooling process for reducing decarburized layer depth of high-carbon alloy tool steel wire rod | |
| CN105441814A (en) | Hot rolled Q&P steel with 700MPa grade yield strength and ultralow yield ratio and manufacturing method thereof | |
| CN114150227B (en) | High-toughness hot stamping steel rolled by medium and thin slabs with Rm more than or equal to 1500MPa and production method | |
| CN105063511B (en) | Ultra-low carbon bainite thin gauge steel plate rolled through heavy and medium plate mill and production method of ultra-low carbon bainite thin gauge steel plate | |
| CN114160571A (en) | Production method of low-hardness 42CrMo steel | |
| CN106957995B (en) | Fine ferrite grain/low temperature bainite two-phase mild steel and preparation method thereof | |
| CN101591756A (en) | Low-crackle sensitive steel board with yield strength of 620 MPa grade and manufacture method thereof | |
| CN103122435A (en) | Hot-rolled titaniferous high-strength steel plate with yield strength higher than 700MPa and production method thereof | |
| CN114480960B (en) | 800 MPa-grade high-strength steel with low yield ratio and low-temperature toughness and production process thereof | |
| CN102296232B (en) | Ultrahigh-strength high-plasticity low-carbon phase change and twin crystal induced plastic hot rolled steel plate and preparation method thereof | |
| CN115161440A (en) | Hot-rolled heavy H-shaped steel with yield strength of 560MPa and production method thereof | |
| CN101109058A (en) | Steel for Immunizing ultra-fine crystal D grade sucker rod sucker rod and manufacturing method thereof | |
| JPH0959718A (en) | Production of seamless steel tube with high strength and high corrosion resistance | |
| CN114405996B (en) | CSP process low-carbon steel plate and manufacturing method thereof | |
| CN1323907A (en) | Relaxation-separation-phase change control technology for producing high-strength low-alloy steel | |
| CN115725892B (en) | Brinell hardness 550 HB-grade wear-resistant steel and production method thereof | |
| CN114807556B (en) | Method for producing Q960E ultrahigh-strength steel through online quenching |
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 | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20220311 |