CN113652604B - Preparation method of high-hardenability hot-rolled round steel for engineering machinery - Google Patents
Preparation method of high-hardenability hot-rolled round steel for engineering machinery Download PDFInfo
- Publication number
- CN113652604B CN113652604B CN202110775839.2A CN202110775839A CN113652604B CN 113652604 B CN113652604 B CN 113652604B CN 202110775839 A CN202110775839 A CN 202110775839A CN 113652604 B CN113652604 B CN 113652604B
- Authority
- CN
- China
- Prior art keywords
- equal
- temperature
- less
- steel
- slow 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.)
- Active
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
- 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
- C21D1/28—Normalising
-
- 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
- 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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/38—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of manganese
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
The invention discloses a preparation method of high-hardenability hot-rolled round steel for engineering machinery, which comprises the following steel-making processes: desulfurized molten iron, converter, external refining, VD vacuum treatment, continuous casting and slow cooling of a slow cooling pit; the steel rolling process comprises the following steps: heating a casting blank, removing phosphorus by high-pressure water, carrying out phi 850 cogging mill, carrying out phi 700mm multiplied by 3+ phi 550mm multiplied by 4 continuous rolling unit rolling, sawing, annealing pit annealing, checking, polishing, bundling, warehousing and delivering; wherein: the initial rolling temperature is less than or equal to 1050 ℃; the finishing temperature is less than or equal to 850 ℃; the temperature of entering a slow cooling pit is more than or equal to 450 ℃; the temperature of the slow cooling pit is less than or equal to 150 ℃; the heat treatment process comprises the following steps: normalizing at a temperature of 910 ℃; the quenching temperature is 895 ℃. The yield strength, tensile strength, elongation and hardenability of the steel product prepared by the method all meet the performance requirements.
Description
Technical Field
The invention relates to the field of material metallurgy, in particular to a preparation method of high-hardenability hot-rolled round steel for engineering machinery.
Background
With the development of engineering machinery manufacturing technology, equipment is developed to be large-sized and large-tonnage, and new requirements are provided for the use conditions of materials. Because the engineering mechanical equipment has harsh use conditions and requires that parts and components of the engineering machinery have excellent comprehensive mechanical properties and high hardenability, a low-cost low-alloying high hardenability hot rolled steel is developed on the basis of the conventional steel production technology, and the low-cost low-alloying high hardenability hot rolled steel has important significance on the service life, the durability and the safety of the engineering mechanical equipment.
The patent CNIO 8866431A relates to a steel for high hardenability of engineering machinery and a controlled rolling and controlled cooling preparation method thereof, and the production process is complex by adopting a controlled rolling and controlled cooling process, so that the steel is not suitable for popularization and application.
The patent CN 108866431B discloses a steel for high hardenability of engineering machinery and a controlled rolling and controlled cooling preparation method thereof, which have high requirements on production equipment and are difficult to realize.
Disclosure of Invention
In order to solve the technical problems, the invention aims to provide a preparation method of high-hardenability hot-rolled round steel for engineering machinery.
In order to solve the technical problems, the invention adopts the following technical scheme:
a preparation method of high-hardenability hot-rolled round steel for engineering machinery is characterized by comprising the following steps:
the steel-making process comprises the following steps: desulfurized molten iron, converter, external refining, VD vacuum treatment, continuous casting and slow cooling of a slow cooling pit; wherein:
smelting in a combined blown converter, adopting double-slag operation, and controlling the alkalinity of final slag according to 3.5;
LF ladle refining, wherein argon blowing operation is carried out in the whole refining process;
VD deep vacuum time is more than or equal to 13 min;
feeding 200 m of iron-calcium wire after VD vacuum treatment is finished, and ensuring that soft blowing Ar is ensured to be more than 12min after wire feeding;
the superheat degree of continuous casting is less than or equal to 25 ℃;
the casting machine has a casting speed of less than or equal to 0.62 m/min.
The steel rolling process comprises the following steps: heating a casting blank, removing phosphorus by high-pressure water, carrying out phi 850 cogging mill, carrying out phi 700mm multiplied by 3+ phi 550mm multiplied by 4 continuous rolling unit rolling, sawing, annealing pit annealing, checking, polishing, bundling, warehousing and delivering; wherein:
the initial rolling temperature is less than or equal to 1050 ℃;
the finishing temperature is less than or equal to 850 ℃;
the temperature of the entering slow cooling pit is more than or equal to 450 ℃;
the temperature of the cooling medium discharged from the slow cooling pit is less than or equal to 150 ℃.
The heat treatment process comprises the following steps: normalizing at a temperature of 910 ℃; the quenching temperature is 895 ℃.
Further, the hot-rolled round steel comprises the following chemical components in percentage by mass: c: 0.39-0.43%, Si: 0.23-0.33%, Mn: 1.68-1.78%, P is less than or equal to 0.025, S is less than or equal to 0.020, Cr: 0.12 to 0.17 percent of the total weight of the alloy, and the balance of Fe and other trace impurity elements.
The effects of some elements in the steel of the invention are as follows:
c: as the carbon content increases, the hardenability and hardenability of the steel increase, but the toughness and weldability of the steel decrease. By applying the technology of the invention, the upper limit of the carbon content is between 0.39% and 0.43% under the condition of not influencing the hardenability of the steel.
Mn: solid solution strengthening elements and right shift of the C curve, thereby obviously improving the hardenability of the steel. Manganese increases toughness and strength of steel, but too high manganese causes segregation. By the technology of the invention, the manganese content is between 1.68% and 1.78%.
Cr: cr can improve the strength, hardness and atmospheric corrosion resistance of steel, and has obvious effect when other alloy elements are added. Chromium slows down the decomposition speed of austenite, remarkably improves the hardenability of steel, has a secondary hardening effect, and increases the temper brittleness tendency of steel. However, if the chromium content is too high, the toughness of the base material and the heat affected zone may be reduced. The Cr element content of the material is designed as Cr: 0.12 to 0.17 percent.
Compared with the prior art, the invention has the beneficial technical effects that:
the invention can effectively improve the hardenability of steel for engineering machinery, homogenize the structure and improve the mechanical property of steel through reasonable chemical component design and production process.
Detailed Description
The present invention is further illustrated by the following specific examples, which are provided for illustrative purposes only and are not to be construed as limiting the scope of the present invention.
The invention is further described below:
table 1 is a table listing the chemical components and weight percent content of each example of the invention;
table 2 shows the specific production process parameters of examples 1 and 2;
table 3 is a table of mechanical property test results of the embodiments of the present invention.
TABLE 1 chemical composition and weight percentage of the examples
| Examples | C | Si | Mn | P | S | Cr |
| 1 | 0.40 | 0.27 | 1.71 | 0.018 | 0.010 | 0.14 |
| 2 | 0.40 | 0.26 | 1.68 | 0.020 | 0.011 | 0.16 |
Table 2 production process parameters for examples 1 and 2
TABLE 3 mechanical Property test results List of the various embodiments of the present invention
The above detection data can show that: the method can be realized by the technological parameters and the component range of the invention. The yield strength, tensile strength, elongation and hardenability of the steel product of the embodiment of the invention all meet the performance requirements.
The above-described embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solutions of the present invention can be made by those skilled in the art without departing from the spirit of the present invention, and the technical solutions of the present invention are within the scope of the present invention defined by the claims.
Claims (1)
1. A preparation method of high-hardenability hot-rolled round steel for engineering machinery is characterized by comprising the following steps:
the steel-making process comprises the following steps: desulfurized molten iron, converter, external refining, VD vacuum treatment, continuous casting and slow cooling of a slow cooling pit; wherein:
smelting in a combined blown converter, adopting double-slag operation, and controlling the alkalinity of final slag according to 3.5;
LF ladle refining, wherein argon blowing operation is carried out in the whole refining process;
VD deep vacuum time is more than or equal to 13 min;
feeding 200 m of iron-calcium wire after VD vacuum treatment is finished, and ensuring that soft blowing Ar is ensured to be more than 12min after wire feeding;
the superheat degree of continuous casting is less than or equal to 25 ℃;
the casting machine pulling speed is more than or equal to 0.53m/min and less than or equal to 0.62 m/min;
the steel rolling process comprises the following steps: heating a casting blank, removing phosphorus by high-pressure water, carrying out phi 850 cogging mill, carrying out phi 700mm multiplied by 3+ phi 550mm multiplied by 4 continuous rolling unit rolling, sawing, annealing pit annealing, checking, polishing, bundling, warehousing and delivering; wherein:
the initial rolling temperature is more than or equal to 1020 ℃ and less than or equal to 1050 ℃;
the finishing temperature is more than or equal to 821 ℃ and less than or equal to 850 ℃;
the temperature of entering a slow cooling pit is more than or equal to 450 ℃ and less than or equal to 465 ℃;
the temperature of the annealing pit is more than or equal to 127 ℃ and less than or equal to 150 ℃;
the heat treatment process comprises the following steps: normalizing at a temperature of 910 ℃; the quenching temperature is 895 ℃;
the hot-rolled round steel comprises the following chemical components in percentage by mass: c: 0.39-0.43%, Si: 0.23-0.33%, Mn: 1.68-1.78%, P is less than or equal to 0.025, S is less than or equal to 0.020, Cr: 0.12 to 0.17 percent of the total weight of the alloy, and the balance of Fe and other trace impurity elements.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110775839.2A CN113652604B (en) | 2021-07-09 | 2021-07-09 | Preparation method of high-hardenability hot-rolled round steel for engineering machinery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110775839.2A CN113652604B (en) | 2021-07-09 | 2021-07-09 | Preparation method of high-hardenability hot-rolled round steel for engineering machinery |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113652604A CN113652604A (en) | 2021-11-16 |
| CN113652604B true CN113652604B (en) | 2022-06-21 |
Family
ID=78489262
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110775839.2A Active CN113652604B (en) | 2021-07-09 | 2021-07-09 | Preparation method of high-hardenability hot-rolled round steel for engineering machinery |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113652604B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116287939B (en) * | 2023-03-13 | 2024-10-29 | 包头钢铁（集团）有限责任公司 | Production and preparation method for producing electromagnetic pure iron DT4 hot rolled round steel by VD process |
Family Cites Families (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101307414B (en) * | 2008-06-25 | 2010-06-02 | 莱芜钢铁股份有限公司 | Steel for high performance manganese-containing engineering machinery wheel and method for preparing same |
| JP2016180165A (en) * | 2015-03-25 | 2016-10-13 | 株式会社神戸製鋼所 | Molding component for fracture separation type connecting rod and fracture separation type connecting rod, and manufacturing method therefor |
| CN107747041B (en) * | 2017-11-01 | 2020-03-03 | 承德建龙特殊钢有限公司 | Normalized manganese gas cylinder steel and preparation method thereof |
| CN108411192A (en) * | 2018-03-05 | 2018-08-17 | 山东钢铁股份有限公司 | A kind of high-hardenability engineering machinery thrust wheel steel and preparation method |
| CN108866431B (en) * | 2018-06-11 | 2020-03-17 | 山东钢铁股份有限公司 | Steel for high hardenability of engineering machinery and controlled rolling and controlled cooling preparation method thereof |
| CN109930063B (en) * | 2019-03-11 | 2020-05-05 | 江苏利淮钢铁有限公司 | Steel for engineering machinery crawler chassis wheel body and production method thereof |
| JP7070794B2 (en) * | 2019-03-29 | 2022-05-18 | 日本製鉄株式会社 | High-strength hot-rolled steel sheet |
| CN109988973A (en) * | 2019-05-22 | 2019-07-09 | 湖南华菱湘潭钢铁有限公司 | A kind of production method of axle head hot rolled circular steel |
| CN111485167A (en) * | 2020-03-26 | 2020-08-04 | 包头钢铁（集团）有限责任公司 | Hot-rolled round steel for rare earth microalloyed 25MnCrNiMoA coupler yoke and production method thereof |
| CN111495968B (en) * | 2020-04-20 | 2022-02-11 | 马鞍山钢铁股份有限公司 | Cold heading steel ML45Mn2 hot-rolled wire rod for 10.9-grade railway locomotive high-strength rivet and production method thereof |
| CN111647799B (en) * | 2020-04-30 | 2021-09-28 | 靖江特殊钢有限公司 | High-strength and high-toughness hot-rolled round steel capable of being directly cut and preparation method thereof |
| CN111647800B (en) * | 2020-04-30 | 2022-03-15 | 靖江特殊钢有限公司 | Preparation method of hot-rolled round steel capable of being directly cut |
| CN111560556A (en) * | 2020-05-22 | 2020-08-21 | 包头钢铁（集团）有限责任公司 | Preparation method of low-cost sulfuric acid corrosion-resistant 09CrCuSbRE hot-rolled round steel |
| CN111500931A (en) * | 2020-05-22 | 2020-08-07 | 包头钢铁（集团）有限责任公司 | Preparation method of Q460 hot-rolled round steel for rare earth low-temperature-resistant automobile parts |
-
2021
- 2021-07-09 CN CN202110775839.2A patent/CN113652604B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN113652604A (en) | 2021-11-16 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110846580B (en) | high-Mo high-performance Mn-Cr series steel for wind power output gear and production method thereof | |
| CN111394639B (en) | Manufacturing method of high-wear-resistance gear steel | |
| CN109023119A (en) | Wear-resistant steel with excellent ductility and toughness and manufacturing method thereof | |
| CN111118403B (en) | Ti microalloyed high-strength high-toughness bainite non-quenched and tempered steel and forging and cooling control process and production process thereof | |
| CN109930063B (en) | Steel for engineering machinery crawler chassis wheel body and production method thereof | |
| CN116179967A (en) | Material for thrust wheel axle and preparation method thereof | |
| CN113584390B (en) | Round steel for high-strength bolt and preparation method thereof | |
| CN113652604B (en) | Preparation method of high-hardenability hot-rolled round steel for engineering machinery | |
| CN115627424A (en) | 1.5 GPa-grade novel high-plasticity cold-rolled DH steel and preparation method thereof | |
| CN114182179A (en) | High-strength bucket tooth steel for engineering machinery and production method and heat treatment process thereof | |
| CN117845134A (en) | Medium carbon steel for automobile front axle and preparation method thereof | |
| CN116657054A (en) | Rare earth element-containing high-temperature oxidation resistant hot stamping steel and hot stamping forming process | |
| CN115537649B (en) | Steel for high-temperature carburized shaft teeth and manufacturing method thereof | |
| CN113151744B (en) | Steel S48C for engineering machinery slewing bearing and production method thereof | |
| CN113151651B (en) | Production method of low-temperature annealed ultra-deep drawn cold-rolled steel plate and cold-rolled steel plate | |
| CN115896615A (en) | Sulfur-containing 37MnSiVSQ free-cutting non-quenched and tempered hot-rolled round steel and preparation method thereof | |
| CN114934239A (en) | Forged non-quenched and tempered steel for hydraulic cylinder rod head and production method thereof | |
| CN113667900A (en) | High-hardenability carburizing steel, and manufacturing method and application thereof | |
| CN116891931A (en) | Preparation method of 30Mn2 hot rolled round steel for engineering machinery half shaft sleeve pipe | |
| CN111876679A (en) | Chromium-vanadium hot-rolled steel wire rod and preparation method thereof, and preparation method of steel wire and hand tool | |
| CN110512147A (en) | A kind of rare earth NM400 Wide and Heavy Plates and its production method | |
| CN115717212B (en) | Gear shaft steel and manufacturing method thereof | |
| CN113634594B (en) | Preparation method of hot-rolled round steel for automobile axle pipe | |
| CN116377320B (en) | Ultrahigh-strength steel with high strength and plastic product for cold rolling automobile and manufacturing method thereof | |
| CN114737136B (en) | Production method of high-strength high-toughness hot continuous rolling thin steel plate with Brinell hardness of 400HBW |
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 | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |