CN109593929A - A kind of spheroidizing method of cold-forging steel - Google Patents
A kind of spheroidizing method of cold-forging steel Download PDFInfo
- Publication number
- CN109593929A CN109593929A CN201811519712.9A CN201811519712A CN109593929A CN 109593929 A CN109593929 A CN 109593929A CN 201811519712 A CN201811519712 A CN 201811519712A CN 109593929 A CN109593929 A CN 109593929A
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- CN
- China
- Prior art keywords
- cold
- forging steel
- spheroidizing
- steel
- forging
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Classifications
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- 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
- C21D1/32—Soft annealing, e.g. spheroidising
-
- 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
Abstract
The invention discloses a kind of spheroidizing method of cold-forging steel, the cold-forging steel is heated to >=693 DEG C, and soaking time presses 3.3~4.3mm/min effective cross-section THICKNESS CALCULATION；It is cooled to≤200 DEG C fastly；Then 650~690 DEG C are again heated to, 6~20h is kept the temperature；Last furnace cooling.This method changes the distribution situation of carbide particle after nodularization in steel, is distributed more evenly across it in matrix by control cooling and temperature Rate, it is distributed in intra-die, carbide is reduced in the segregation of grain boundaries, thus enhance plasticity, the contraction percentage of area >=65% of product；Another distinguishing feature can also realize spheroidizing well in the case where plastic-less deformation.
Description
Technical field
The invention belongs to metallurgical technology field, the spheroidizing method of especially a kind of cold-forging steel.
Background technique
SWRCH22A cold-forging steel is mild steel, is widely used in the standard components such as production screw, pin, nut, is producing and processing
Process deformation is larger, the heat treatment softening process such as interspersed spheroidizing is needed, to enhance the moulding of steel.But SWRCH22A
Cold-forging steel still will appear cold heading cracking phenomenon after the softening of conventional spheroidizing.This is mainly due in the steel after spheroidizing
Carbide particle major part intercrystalline precipitation, reduce the plasticity of steel.In addition, mild steel is in the case where plastic-less deformation,
No image of Buddha hypereutectoid steel carries out spheroidising by nodularization nucleation mass point of undissolved carbide like that.Therefore, for plastic-less deformation
Mild steel or sub-eutectoid steel, there is no in industry effective ways to carry out spheroidizing.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of spheroidizing methods of cold-forging steel that product plasticity is good.
In order to solve the above technical problems, the technical solution used in the present invention is: the cold-forging steel is heated to >=693 DEG C,
Soaking time presses 3.3~4.3mm/min effective cross-section THICKNESS CALCULATION；It is cooled to≤200 DEG C fastly；Then 650~690 are again heated to
DEG C, keep the temperature 6~20h；Last furnace cooling.
The cooling rate of rapid cooling of the present invention is 20~50 DEG C/s.
The chemical component and weight percentage of cold-forging steel of the present invention are as follows: C 0.18%~0.22%, Si≤0.07%,
Mn 0.75%~0.95%, Al 0.025%~0.055%, remaining is Fe and impurity element.
The beneficial effects of adopting the technical scheme are that the present invention is changed by control cooling and temperature Rate
The distribution situation for having become carbide particle after nodularization in steel, is distributed more evenly across it in matrix, is distributed in intra-die, subtract
Lack carbide in the segregation of grain boundaries, to enhance plasticity；Another distinguishing feature, also can be fine in the case where plastic-less deformation
Realization spheroidizing.Carbide particle can be distributed more evenly across intra-die in steel after processed by the invention, reduce carbon
The crystal boundary segregation of compound, so as to preferably improve the plasticity of steel, the contraction percentage of area >=65% of product.
Detailed description of the invention
The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.
Fig. 1 is the metallographic structure photo after spheroidizing of the present invention；
Fig. 2 is the metallographic structure photo after conventional spheroidizing.
Specific embodiment
Embodiment 1-8: the spheroidizing method of this cold-forging steel uses following techniques.
(1) product composition: selecting the hot rolling disk circle SWRCH22A cold-forging steel of 5.5~6.5mm of diameter to be produced, each to implement
The chemical component and weight percentage of example steel are shown in Table 1.
Table 1: the chemical component (wt) of each embodiment steel
(2)-the technical process of furnace cooling method and process: is kept the temperature using heating-heat preservation-rapid cooling-reheating-again.In sky
>=693 DEG C it is heated in steam stove, first time heating temperature is higher than austenitizing temperature, i.e.,；In order to allow steel surface and inside reach
Austenitizing temperature is kept the temperature；The shorter steel temperature the better in the austenitizing temperature heat preservation residence time, its purpose is to
C is allowed to be unevenly distributed in steel, soaking time presses 3.3~4.3mm/min of effective cross-section thickness calculating.When rapid cooling, with 20~50
DEG C/cooling rate of s is cooled to 200 DEG C and less.The temperature of reheating is 650~690 DEG C, then soaking time is 6~20h.
Last furnace cooling is to 400 DEG C and following.The concrete technology of each embodiment is shown in Table 2.
Table 2: the technological parameter of each embodiment
(3) Fig. 1 is the metallographic structure photo of product after 1 spheroidizing of embodiment, after Fig. 2 is like products routine spheroidizing
Metallographic structure photo；By Fig. 1,2 as it can be seen that this method effectively reduces carbide carbide after the segregation of grain boundaries, nodularization
Particle is more evenly distributed.The performance of products obtained therefrom is shown in Table 3 after each embodiment spheroidizing.
Table 3: the performance of each embodiment products obtained therefrom
Claims (4)
1. a kind of spheroidizing method of cold-forging steel, it is characterised in that: the cold-forging steel is heated to >=693 DEG C, and soaking time is pressed
3.3~4.3mm mm/min effective cross-section THICKNESS CALCULATION；It is cooled to≤200 DEG C fastly；Then 650~690 DEG C are again heated to, heat preservation 6
~20h；Last furnace cooling.
2. a kind of spheroidizing method of cold-forging steel according to claim 1, it is characterised in that: the cooling speed of the rapid cooling
Rate is 20~50 DEG C/s.
3. a kind of spheroidizing method of cold-forging steel according to claim 1, it is characterised in that: the furnace cooling is extremely
400 DEG C and less.
4. a kind of spheroidizing method of cold-forging steel according to claim 1,2 or 3, which is characterized in that the cold-forging steel
Chemical component and weight percentage are as follows: C 0.18%~0.22%, Si≤0.07%, Mn 0.75%~0.95%, Al 0.025%
~0.055%, remaining is Fe and impurity element.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811519712.9A CN109593929B (en) | 2018-12-12 | 2018-12-12 | Spheroidizing annealing method of cold forging steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811519712.9A CN109593929B (en) | 2018-12-12 | 2018-12-12 | Spheroidizing annealing method of cold forging steel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109593929A true CN109593929A (en) | 2019-04-09 |
| CN109593929B CN109593929B (en) | 2020-10-30 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201811519712.9A Active CN109593929B (en) | 2018-12-12 | 2018-12-12 | Spheroidizing annealing method of cold forging steel |
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4021272A (en) * | 1974-04-19 | 1977-05-03 | Hitachi Metals, Ltd. | Method of isothermal annealing of band steels for tools and razor blades |
| JPS61264158A (en) * | 1985-05-08 | 1986-11-22 | Kobe Steel Ltd | Low carbon steel bar or wire rod for cold forging |
| JP2000239737A (en) * | 1999-02-22 | 2000-09-05 | Ovako Steel Ab | Spheroidizing annealing method of hypo-eutectic low alloy steel |
| CN101787492A (en) * | 2010-03-17 | 2010-07-28 | 上海大学 | Manufacturing method of high quality and large size mandril blank |
| CN103774059A (en) * | 2014-01-13 | 2014-05-07 | 胡财基 | Pre-hardening plastic die steel |
| CN104278200A (en) * | 2014-09-17 | 2015-01-14 | 北京科技大学 | High-hot-strength spray-formed hot work die steel and preparation method thereof |
| CN106011404A (en) * | 2016-07-08 | 2016-10-12 | 邢台钢铁有限责任公司 | Spheroidizing annealing method for medium-and-low-carbon alloy cold forging steel |
| CN107557667A (en) * | 2017-09-15 | 2018-01-09 | 张家港市广大机械锻造有限公司 | A kind of large die-casting mould high performance hot-work die steel and its manufacturing process |
| CN108070703A (en) * | 2016-11-18 | 2018-05-25 | 贵州宏博轴承有限公司 | A kind of bearing heat treatment process |
-
2018
- 2018-12-12 CN CN201811519712.9A patent/CN109593929B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4021272A (en) * | 1974-04-19 | 1977-05-03 | Hitachi Metals, Ltd. | Method of isothermal annealing of band steels for tools and razor blades |
| JPS61264158A (en) * | 1985-05-08 | 1986-11-22 | Kobe Steel Ltd | Low carbon steel bar or wire rod for cold forging |
| JP2000239737A (en) * | 1999-02-22 | 2000-09-05 | Ovako Steel Ab | Spheroidizing annealing method of hypo-eutectic low alloy steel |
| CN101787492A (en) * | 2010-03-17 | 2010-07-28 | 上海大学 | Manufacturing method of high quality and large size mandril blank |
| CN103774059A (en) * | 2014-01-13 | 2014-05-07 | 胡财基 | Pre-hardening plastic die steel |
| CN104278200A (en) * | 2014-09-17 | 2015-01-14 | 北京科技大学 | High-hot-strength spray-formed hot work die steel and preparation method thereof |
| CN106011404A (en) * | 2016-07-08 | 2016-10-12 | 邢台钢铁有限责任公司 | Spheroidizing annealing method for medium-and-low-carbon alloy cold forging steel |
| CN108070703A (en) * | 2016-11-18 | 2018-05-25 | 贵州宏博轴承有限公司 | A kind of bearing heat treatment process |
| CN107557667A (en) * | 2017-09-15 | 2018-01-09 | 张家港市广大机械锻造有限公司 | A kind of large die-casting mould high performance hot-work die steel and its manufacturing process |
Non-Patent Citations (2)
| Title |
|---|
| 简光沂: "《中外钢号便查手册》", 29 February 2008, 中国电力出版社 * |
| 蒋清亮: "《工程材料与热处理》", 31 August 2011, 北京邮电大学出版社 * |
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| CN109593929B (en) | 2020-10-30 |
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