CN113634594B - Preparation method of hot-rolled round steel for automobile axle pipe - Google Patents
Preparation method of hot-rolled round steel for automobile axle pipe Download PDFInfo
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- CN113634594B CN113634594B CN202110775838.8A CN202110775838A CN113634594B CN 113634594 B CN113634594 B CN 113634594B CN 202110775838 A CN202110775838 A CN 202110775838A CN 113634594 B CN113634594 B CN 113634594B
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- 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
- B21B1/16—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 wire rods, bars, merchant bars, rounds wire or material of like small cross-section
- B21B1/18—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 wire rods, bars, merchant bars, rounds wire or material of like small cross-section in a continuous process
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- 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
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- 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
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- 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
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- 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
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- 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
Abstract
The invention discloses a preparation method of hot-rolled round steel for an automobile axle pipe, wherein the size specification of the hot-rolled round steel is phi 50-phi 150mm; the smelting and rolling technical parameters are as follows: the VD vacuum time for smelting is more than or equal to 20min; the vacuum degree is less than or equal to 0.1KPa; feeding iron-calcium wires more than or equal to 150 meters after vacuum breaking; the superheat degree of continuous casting is less than or equal to 30 ℃; the casting machine pulling speed is less than or equal to 0.5m/min; the heating temperature of the casting blank is 1150-1250 ℃; the initial rolling temperature is less than or equal to 1050 ℃; the finishing temperature is less than or equal to 870 ℃; the temperature of entering a slow cooling pit is more than or equal to 550 ℃; the temperature of the annealing pit is less than or equal to 150 ℃, and the invention aims to provide the preparation method of the hot-rolled round steel for the automobile axle pipe.
Description
Technical Field
The invention relates to the field of material metallurgy, in particular to a preparation method of hot-rolled round steel for an automobile axle pipe.
Background
With the rapid development of national economy, the freight transportation volume is continuously increased in a violent way, the sales volume of heavy trucks in China keeps increasing, and the sales volume reaches 162.3 thousands in 2020. The axle industry is continuously promoted along with the development of automobile technology, and the axle is a main part of automobile transmission and is required to have the performances of light weight, good rigidity, strong bearing capacity and the like.
At present, no report about hot rolled round steel for automobile axle housings is available in the prior art patents, and the patents (CN 201610687537.9, CN 111893385A) which can be checked about steel plates for axle housings are not related to the patent.
Disclosure of Invention
The invention aims to provide a preparation method of hot-rolled round steel for an automobile axle pipe, and the hot-rolled round steel for the axle pipe prepared by the method has the characteristics of high strength, good rigidity, easiness in processing and the like.
In order to solve the technical problem, the invention adopts the following technical scheme:
the preparation method of the hot-rolled round steel for the automobile axle pipe comprises the following chemical components in percentage by mass: c:0.49% -0.51%; si:0.22 to 0.32 percent; mn:0.70 to 0.80 percent; p: less than or equal to 0.015 percent; s: less than or equal to 0.010 percent; cr:0.20 to 0.25 percent, and the balance of Fe and inevitable trace impurities; the dimension specification of the hot rolled round steel is phi 50-phi 150mm;
the steelmaking process flow comprises the following steps: converter-external refining-VD vacuum treatment-continuous casting-slow cooling in a slow cooling pit; the steel rolling process flow comprises the following steps: the method comprises the following steps of casting blank heating, high-pressure water dephosphorization, a phi 850 cogging mill, a phi 700mm multiplied by 3+ a phi 550mm multiplied by 4 continuous rolling unit rolling, saw cutting, slow cooling of a slow cooling pit, inspection, polishing, bundling, warehousing and delivery, wherein the smelting and rolling technical parameters are as follows:
the VD vacuum time for smelting is more than or equal to 20min; the vacuum degree is less than or equal to 0.1KPa; feeding iron-calcium wires more than or equal to 150 meters after vacuum breaking; the superheat degree of continuous casting is less than or equal to 30 ℃; the casting machine has a casting speed of less than or equal to 0.5m/min; the heating temperature of the casting blank is 1150-1250 ℃; the initial rolling temperature is less than or equal to 1050 ℃; the finishing temperature is less than or equal to 870 ℃; the temperature of the entering slow cooling pit is more than or equal to 550 ℃; the temperature of the cooling pit is less than or equal to 150 ℃.
Further, the hot-rolled round steel comprises the following chemical components in percentage by mass: c:0.50 percent; si:0.25 percent; mn:0.75 percent; p:0.012%; s:0.005 percent; cr:0.22 percent, and the balance of Fe and inevitable trace impurities.
Further, the hot-rolled round steel comprises the following chemical components in percentage by mass: c:0.49 percent; si:0.26 percent; mn:0.78%; p:0.011 percent; s:0.009%; cr:0.25 percent, and the balance of Fe and inevitable trace impurities.
The design principle of the hot-rolled round steel is as follows:
c: c is the most effective element for improving the strength of the steel, the tensile strength and the yield strength of the steel are improved along with the increase of the content of C, but the elongation and the impact toughness are reduced, the corrosion resistance is also reduced, and the welding heat affected zone of the steel can be hardened to cause the generation of welding cold cracks. In order to ensure that the material obtains good comprehensive performance, the content of the C element in the steel is designed to be 0.49-0.51%.
Mn: mn is an important toughening element, the components are low, the strength of the steel is obviously improved along with the increase of the content of manganese, the processing performance of the steel is improved, and the ductile-brittle transition temperature is hardly changed. However, too high manganese content may inhibit ferrite transformation, affect the yield strength of steel, and be detrimental to yield ratio control. The Mn element content of the material is designed as Mn:0.70 to 0.80 percent.
Si: si can improve the corrosion resistance of steel, and is often added into stainless steel, low alloy steel and corrosion-resistant alloy to improve the corrosion resistance of the alloy, so that the alloy has the performances of resisting chloride stress corrosion cracking, pitting corrosion, hot concentrated nitric acid corrosion, oxidation, seawater corrosion and the like. Research shows that in hot and humid atmosphere environment, si can obviously improve the atmospheric corrosion resistance of carbon steel and low alloy steel, and in addition, si can also improve the corrosion resistance of splash zones of the low alloy steel in seawater. The Si element content of the material is designed to be 0.22-0.32%.
P, S: p and S are impurity elements in the steel. P has a certain effect of improving corrosion resistance, but is an element easy to segregate, generates serious segregation in the local part of steel, reduces plasticity and toughness, and is extremely harmful to low-temperature toughness. The S element is easily segregated and enriched in steel, and is an element that is detrimental to corrosion resistance. The steel of the invention strictly controls the content levels of sulfur and phosphorus in the aspect of metallurgical quality, namely P: less than or equal to 0.015 percent; s: less than or equal to 0.010 percent.
Cr: cr can improve the strength, hardness and atmospheric corrosion resistance of the steel, and has more obvious effect when other alloy elements are added. Chromium can slow down the decomposition speed of austenite, remarkably improve the hardenability of steel, has the secondary hardening effect, and also increases the temper brittleness tendency of the 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:0.20 to 0.25 percent.
Compared with the prior art, the invention has the beneficial technical effects that:
the performance of the hot-rolled round steel after heat treatment meets the following conditions: the lower yield strength is more than or equal to 375MPa; the tensile strength is more than or equal to 630MPa; the elongation after fracture is more than or equal to 14 percent; the reduction of area is more than or equal to 40 percent; the impact absorption energy is more than or equal to 31J; the hardness is less than or equal to 241HB.
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 will be further described:
table 1 is a table listing the chemical components and weight percent content of each example of the invention;
table 2 shows the specific parameters of the production processes of examples 1 and 2 of the present invention;
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 | 0.50 | 0.25 | 0.75 | 0.012 | 0.005 | 0.22 |
| 2 | 0.49 | 0.26 | 0.78 | 0.011 | 0.009 | 0.25 |
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
As can be seen from the data in table 3: the yield strength, tensile strength, elongation, reduction of area, impact toughness and hardness of the steel product of the embodiment of the invention all meet the performance requirements of the hot-rolled round steel for the automobile axle tube.
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 (3)
1. A preparation method of hot-rolled round steel for an automobile axle pipe is characterized by comprising the following steps: the hot-rolled round steel comprises the following chemical components in percentage by mass: c:0.49 to 0.51 percent; si:0.22 to 0.32 percent; mn:0.70% -0.80%; p: less than or equal to 0.015 percent; s: less than or equal to 0.010 percent; cr:0.20 to 0.25 percent, and the balance of Fe and inevitable trace impurities; the dimension specification of the hot rolled round steel is phi 50-phi 150mm;
the steelmaking process flow comprises the following steps: converter-external refining-VD vacuum treatment-continuous casting-slow cooling in a slow cooling pit; the steel rolling process flow is as follows: the method comprises the following steps of casting blank heating, high-pressure water dephosphorization, a phi 850 cogging mill, a phi 700mm multiplied by 3+ a phi 550mm multiplied by 4 continuous rolling unit rolling, saw cutting, slow cooling of a slow cooling pit, inspection, polishing, bundling, warehousing and delivery, wherein the smelting and rolling technical parameters are as follows:
the VD vacuum time for smelting is more than or equal to 20min; the vacuum degree is less than or equal to 0.1KPa; feeding iron-calcium wires more than or equal to 150 meters after vacuum breaking; the continuous casting superheat degree is less than or equal to 30 ℃; the casting machine has a casting speed of less than or equal to 0.5m/min; the heating temperature of the casting blank is 1150-1250 ℃; the initial rolling temperature is less than or equal to 1050 ℃; the finishing temperature is less than or equal to 870 ℃; the temperature of the entering slow cooling pit is more than or equal to 550 ℃; the temperature of the cooling pit is less than or equal to 150 ℃.
2. The method for preparing the hot-rolled round steel for the automobile axle pipe according to claim 1, wherein the method comprises the following steps: the hot-rolled round steel comprises the following chemical components in percentage by mass: c:0.50 percent; si:0.25 percent; mn:0.75 percent; p:0.012%; s:0.005 percent; cr:0.22 percent, and the balance of Fe and inevitable trace impurities.
3. The method for preparing the hot-rolled round steel for the automobile axle pipe according to claim 1, wherein the method comprises the following steps: the hot-rolled round steel comprises the following chemical components in percentage by mass: c:0.49 percent; si:0.26 percent; mn:0.78%; p:0.011 percent; s:0.009%; cr:0.25 percent, and the balance of Fe and inevitable trace impurities.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202110775838.8A CN113634594B (en) | 2021-07-09 | 2021-07-09 | Preparation method of hot-rolled round steel for automobile axle pipe |
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| CN202110775838.8A CN113634594B (en) | 2021-07-09 | 2021-07-09 | Preparation method of hot-rolled round steel for automobile axle pipe |
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| Publication Number | Publication Date |
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| CN113634594A CN113634594A (en) | 2021-11-12 |
| CN113634594B true CN113634594B (en) | 2023-03-21 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104032224B (en) * | 2013-09-26 | 2015-12-02 | 北大方正集团有限公司 | A kind of non-hardened and tempered steel and production technique thereof |
| CN107779577B (en) * | 2016-08-26 | 2019-04-26 | 鞍钢股份有限公司 | A kind of garden tool set steel that processing performance is excellent and its production method |
| CN106756507B (en) * | 2016-12-30 | 2018-11-09 | 日照钢铁控股集团有限公司 | The method for producing Thin Specs high-carbon steel based on ESP bar strip continuous casting and rolling flow paths |
| CN110205547A (en) * | 2019-06-13 | 2019-09-06 | 山东钢铁股份有限公司 | A kind of camshaft non-hardened and tempered steel and preparation 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 |
| 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 |
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