CN112501505A - Preparation method of non-modulated steel 38MnVS6 - Google Patents

Preparation method of non-modulated steel 38MnVS6 Download PDF

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Publication number
CN112501505A
CN112501505A CN202011269584.4A CN202011269584A CN112501505A CN 112501505 A CN112501505 A CN 112501505A CN 202011269584 A CN202011269584 A CN 202011269584A CN 112501505 A CN112501505 A CN 112501505A
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China
Prior art keywords
steel
forging
percent
temperature
kept
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Pending
Application number
CN202011269584.4A
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Chinese (zh)
Inventor
高华耀
江宏亮
刘栋林
朱康宁
周湛
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Jiangsu Lianfeng Energy Equipment Co Ltd
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Jiangsu Lianfeng Energy Equipment Co Ltd
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Priority to CN202011269584.4A priority Critical patent/CN112501505A/en
Publication of CN112501505A publication Critical patent/CN112501505A/en
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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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
    • B21K29/00—Arrangements for heating or cooling during processing
    • 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
    • C22C38/001—Ferrous alloys, e.g. steel alloys containing N
    • 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
    • C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
    • 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
    • C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium 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
    • C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium
    • 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

Abstract

The invention discloses a preparation method of non-modulated steel 38MnVS6, which comprises the following chemical components in percentage by mass: c: 0.37-0.46%; si: 0.31-0.88%; mn: 1.16-1.63%; s: 0.03-0.069%; cr: 0.25 to 0.41; mo: less than or equal to 0.95 percent; v: 0.18-0.26%; n: 0.03-0.26%; the balance of iron and inevitable impurities; placing the steel material in a vacuum induction furnace, heating to 1160-1210 ℃ for smelting, and deoxidizing by using Al during smelting; casting the smelted molten steel into a steel billet; forging the steel billet, wherein the steel billet is preheated and heat-preserved before forging, the preheating temperature is kept at 1150-1200 ℃, and the heat preservation time is 2-2.5 hours; the initial forging temperature is kept at 950-1000 ℃, the final forging temperature is kept at 800-850 ℃, and air cooling is carried out to room temperature after forging; and the final forging deformation amount is ensured to be between 25 and 35 percent. The toughness of the non-modulation steel is improved by the micro-metal and forging and cooling control technology.

Description

Preparation method of non-modulated steel 38MnVS6
Technical Field
The invention belongs to the technical field of non-quenched and tempered steel, and particularly relates to a preparation method of non-tempered steel 38MnVS 6.
Background
In the traditional production process, the forging is generally subjected to modulation treatment (quenching and high-temperature tempering) after the forging is finished so as to ensure that the parts obtain excellent comprehensive mechanical properties. The medium carbon microalloyed steel is called as non-quenched steel for short, also called as microalloyed forged steel and air-cooled steel, and means that microelements such as V, Ti, Nb and the like are added into medium carbon structural steel, and parts obtain the same comprehensive mechanical properties after modulation treatment by means of solid solution strengthening, precipitation strengthening and fine grain strengthening generated in the rolling or forging cooling process, so that an energy-saving material for quenching and tempering treatment is saved. Compared with the traditional alloy structural steel, the non-quenched and tempered steel also overcomes the defects of more working procedures, high energy consumption, serious pollution, long production period and the like while ensuring the quality of parts. In recent years, the variety of non-quenched and tempered steel is more perfect, the application field is more extensive, and the non-quenched and tempered steel is successfully applied to the automobile industry, particularly connecting rods of automobile engines and the like.
The mechanical property of the non-quenched and tempered steel forging is closely related to the vascular structure of the non-quenched and tempered steel forging as the conventional quenched and tempered steel forging, but the internal microstructure and the comprehensive mechanical property of the non-quenched and tempered steel are greatly influenced by the processing technology because the non-quenched and tempered steel does not need to be modulated. However, the performance of the current non-quenched and tempered steel is not particularly stable, and particularly, the toughness of the non-quenched and tempered steel produced in China is insufficient, and the non-quenched and tempered steel is particularly applied to parts of vehicles.
Disclosure of Invention
In order to solve the defects in the prior art, the preparation method of the non-modulated steel 38MnVS6 can improve the toughness of the non-modulated steel and is better suitable for the requirements of automobile forgings.
The technical scheme adopted by the invention is as follows:
a preparation method of non-modulated steel 38MnVS6 comprises the following chemical components in percentage by mass: c: 0.37-0.46%; si: 0.31-0.88%; mn: 1.16-1.63%; s: 0.03-0.069%; cr: 0.25 to 0.41; mo: less than or equal to 0.95 percent; v: 0.18-0.26%; n: 0.03-0.26%; the balance of iron and inevitable impurities; placing the steel material in a vacuum induction furnace, heating to 1160-1210 ℃ for smelting, and deoxidizing by using Al during smelting; casting the smelted molten steel into a steel billet; forging the steel billet, wherein the steel billet is preheated and heat-preserved before forging, the preheating temperature is kept at 1150-1200 ℃, and the heat preservation time is 2-2.5 hours; the initial forging temperature is kept at 950-1000 ℃, the final forging temperature is kept at 800-850 ℃, and air cooling is carried out to room temperature after forging; and the final forging deformation amount is ensured to be between 25 and 35 percent.
Further, the steel comprises the following chemical components in percentage by mass: c: 0.37-0.40%; si: 0.56-0.88%; mn: 1.16-1.42%; s: 0.04-0.069%; cr: 0.25 to 0.32; mo: less than or equal to 0.61 percent; v: 0.135-0.26%; n: 0.11-0.26%; the balance of iron and inevitable impurities.
Further, the steel comprises the following chemical components in percentage by mass: c: 0.42-0.46%; si: 0.31 to 0.66 percent; mn: 1.20-1.63%; s: 0.03-0.038%; cr: 0.35 to 0.41; mo: less than or equal to 0.95 percent; v: 0.18 to 0.21 percent; n: 0.20-0.22%; the balance of iron and inevitable impurities.
Further, the preheat temperature may be maintained at 1180 ℃.
Further, the forged non-quenched and tempered steel is cooled to 500-650 ℃ at a speed of 2-3 ℃/s after natural air cooling, and then air-cooled to room temperature.
The invention has the beneficial effects that:
1. according to the preparation method of the non-modulated steel 38MnVS6, the content of elements such as nitrogen and silicon is adjusted, so that the non-modulated steel can obtain toughness with good performance.
2. In addition, the mechanical property of the non-quenched and tempered steel can meet the requirement by a forging and cooling control mode, and particularly, as the casting temperature is reduced, austenite grains of the non-quenched and tempered steel after forging are refined, so that better toughness is obtained.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1, a method for preparing non-modulated steel 38MnVS6, the steel comprising the following chemical components by mass percent: c: 0.37 percent; si: 0.88 percent; mn: 1.16 percent; s: 0.069%; cr: 0.25; mo: less than or equal to 0.95 percent; v: 0.18 percent; n: 0.26 percent; the balance of iron and inevitable impurities; placing the steel material in a vacuum induction furnace, heating to 1160-1210 ℃ for smelting, and deoxidizing by using Al during smelting; casting the smelted molten steel into a steel billet; forging the steel billet, wherein the steel billet is preheated and heat-preserved before forging, the preheating temperature is kept at 1150-1200 ℃, and the heat preservation time is 2-2.5 hours; the initial forging temperature is kept at 950-1000 ℃, the final forging temperature is kept at 800-850 ℃, and air cooling is carried out to room temperature after forging; and the final forging deformation amount is ensured to be between 25 and 35 percent.
Embodiment 2, a method for preparing non-modulated steel 38MnVS6, the steel comprising the following chemical components by mass percent: c: 0.46 percent; si: 0.31 percent; mn: 1.63 percent; s: 0.03 percent; cr: 0.41; mo: less than or equal to 0.95 percent; v: 0.26 percent; n: 0.03 percent; the balance of iron and inevitable impurities; placing the steel material in a vacuum induction furnace, heating to 1160-1210 ℃ for smelting, and deoxidizing by using Al during smelting; casting the smelted molten steel into a steel billet; forging the steel billet, wherein the steel billet is preheated and heat-preserved before forging, the preheating temperature is kept at 1150-1200 ℃, and the heat preservation time is 2-2.5 hours; the initial forging temperature is kept at 950-1000 ℃, the final forging temperature is kept at 800-850 ℃, and air cooling is carried out to room temperature after forging; and the final forging deformation amount is ensured to be between 25 and 35 percent.
Embodiment 3, a method for preparing non-modulated steel 38MnVS6, the steel comprising the following chemical components by mass percent: c: 0.40 percent; si: 0.56 percent; mn: 1.42 percent; s: 0.04 percent; cr: 0.32 of; mo: less than or equal to 0.61 percent; v: 0.135 percent; n: 0.11 percent; the balance of iron and inevitable impurities; placing the steel material in a vacuum induction furnace, heating to 1160-1210 ℃ for smelting, and deoxidizing by using Al during smelting; casting the smelted molten steel into a steel billet; forging the steel billet, wherein the steel billet is preheated and heat-preserved before forging, the preheating temperature is kept at 1150-1200 ℃, and the heat preservation time is 2-2.5 hours; the initial forging temperature is kept at 950-1000 ℃, the final forging temperature is kept at 800-850 ℃, and air cooling is carried out to room temperature after forging; and the final forging deformation amount is ensured to be between 25 and 35 percent.
Embodiment 4, a method for preparing non-modulated steel 38MnVS6, the steel comprising the following chemical components by mass percent: c: 0.42 percent; si: 0.66 percent; mn: 1.20 percent; s: 0.038%; cr: 0.35; mo: less than or equal to 0.95 percent; v: 0.21 percent; n: 0.22 percent; the balance of iron and inevitable impurities; placing the steel material in a vacuum induction furnace, heating to 1160-1210 ℃ for smelting, and deoxidizing by using Al during smelting; casting the smelted molten steel into a steel billet; forging the steel billet, wherein the steel billet is preheated and heat-preserved before forging, the preheating temperature is kept at 1150-1200 ℃, and the heat preservation time is 2-2.5 hours; the initial forging temperature is kept at 950-1000 ℃, the final forging temperature is kept at 800-850 ℃, and air cooling is carried out to room temperature after forging; and the final forging deformation amount is ensured to be between 25 and 35 percent.
More specifically, the preheat temperature may be maintained at 1180 ℃.
More specifically, the non-quenched and tempered steel after forging can be cooled to 500-650 ℃ at a speed of 2-3 ℃/s and then cooled to room temperature by air.
The above embodiments are only used for illustrating the design idea and features of the present invention, and the purpose of the present invention is to enable those skilled in the art to understand the content of the present invention and implement the present invention accordingly, and the protection scope of the present invention is not limited to the above embodiments. Therefore, all equivalent changes and modifications made in accordance with the principles and concepts disclosed herein are intended to be included within the scope of the present invention.

Claims (5)

1. The preparation method of the non-modulated steel 38MnVS6 is characterized in that the steel comprises the following chemical components in percentage by mass: c: 0.37-0.46%; si: 0.31-0.88%; mn: 1.16-1.63%; s: 0.03-0.069%; cr: 0.25 to 0.41; mo: less than or equal to 0.95 percent; v: 0.18-0.26%; n: 0.03-0.26%; the balance of iron and inevitable impurities; placing the steel material in a vacuum induction furnace, heating to 1160-1210 ℃ for smelting, and deoxidizing by using Al during smelting; casting the smelted molten steel into a steel billet; forging the steel billet, wherein the steel billet is preheated and heat-preserved before forging, the preheating temperature is kept at 1150-1200 ℃, and the heat preservation time is 2-2.5 hours; the initial forging temperature is kept at 950-1000 ℃, the final forging temperature is kept at 800-850 ℃, and air cooling is carried out to room temperature after forging; and the final forging deformation amount is ensured to be between 25 and 35 percent.
2. The preparation method of non-modulated steel 38MnVS6 according to claim 1, wherein the steel comprises the following chemical components by mass percent: c: 0.37-0.40%; si: 0.56-0.88%; mn: 1.16-1.42%; s: 0.04-0.069%; cr: 0.25 to 0.32; mo: less than or equal to 0.61 percent; v: 0.135-0.26%; n: 0.11-0.26%; the balance of iron and inevitable impurities.
3. The preparation method of non-modulated steel 38MnVS6 according to claim 1, wherein the steel comprises the following chemical components by mass percent: c: 0.42-0.46%; si: 0.31 to 0.66 percent; mn: 1.20-1.63%; s: 0.03-0.038%; cr: 0.35 to 0.41; mo: less than or equal to 0.95 percent; v: 0.18 to 0.21 percent; n: 0.20-0.22%; the balance of iron and inevitable impurities.
4. A method of producing non-temper steel 38MnVS6 as claimed in claim 1, 2 or 3, wherein the preheat temperature is maintained at 1180 ℃.
5. The method for preparing non-tempered steel 38MnVS6, according to claim 4, characterized in that the forged non-quenched and tempered steel is cooled to 500-650 ℃ at a speed of 2-3 ℃/s after natural air cooling, and then air cooled to room temperature.
CN202011269584.4A 2020-11-13 2020-11-13 Preparation method of non-modulated steel 38MnVS6 Pending CN112501505A (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101492788A (en) * 2009-03-05 2009-07-29 芜湖三联锻造有限公司 Microalloy non-hardened and tempered steel and controlled forging and cooling process
CN101598172A (en) * 2009-07-27 2009-12-09 上海市机械制造工艺研究所有限公司 A kind of eccentric shaft and manufacture method thereof
CN111633166A (en) * 2020-05-28 2020-09-08 江苏龙城精锻有限公司 Pre-cooling forging process for 38MnVS6 steel

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101492788A (en) * 2009-03-05 2009-07-29 芜湖三联锻造有限公司 Microalloy non-hardened and tempered steel and controlled forging and cooling process
CN101598172A (en) * 2009-07-27 2009-12-09 上海市机械制造工艺研究所有限公司 A kind of eccentric shaft and manufacture method thereof
CN111633166A (en) * 2020-05-28 2020-09-08 江苏龙城精锻有限公司 Pre-cooling forging process for 38MnVS6 steel

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Application publication date: 20210316