CN109628713A - A kind of spheroidizing method of low-carbon steel - Google Patents
A kind of spheroidizing method of low-carbon steel Download PDFInfo
- Publication number
- CN109628713A CN109628713A CN201811519779.2A CN201811519779A CN109628713A CN 109628713 A CN109628713 A CN 109628713A CN 201811519779 A CN201811519779 A CN 201811519779A CN 109628713 A CN109628713 A CN 109628713A
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- China
- Prior art keywords
- low
- steel
- spheroidizing
- carbon steel
- spheroidizing method
- 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.)
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- 238000000034 method Methods 0.000 title claims abstract description 18
- 229910001209 Low-carbon steel Inorganic materials 0.000 title claims abstract description 16
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 20
- 239000010959 steel Substances 0.000 claims abstract description 20
- 238000001816 cooling Methods 0.000 claims abstract description 15
- 238000002791 soaking Methods 0.000 claims abstract description 5
- 238000004364 calculation method Methods 0.000 claims abstract description 4
- 238000010273 cold forging Methods 0.000 claims abstract description 3
- 239000000126 substance Substances 0.000 claims description 4
- 229910052799 carbon Inorganic materials 0.000 claims description 3
- 239000012535 impurity Substances 0.000 claims description 3
- 229910052802 copper Inorganic materials 0.000 claims description 2
- 229910052759 nickel Inorganic materials 0.000 claims description 2
- 238000004321 preservation Methods 0.000 claims description 2
- 239000002245 particle Substances 0.000 abstract description 4
- 238000005204 segregation Methods 0.000 abstract description 4
- 230000008602 contraction Effects 0.000 abstract description 2
- 238000009826 distribution Methods 0.000 abstract description 2
- 239000011159 matrix material Substances 0.000 abstract description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000003763 carbonization Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 238000005098 hot rolling Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000006911 nucleation Effects 0.000 description 1
- 238000010899 nucleation Methods 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000003303 reheating Methods 0.000 description 1
Classifications
-
- 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
- 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
- C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
-
- 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
- C22C38/16—Ferrous alloys, e.g. steel alloys containing 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
-
- 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
- C22C38/20—Ferrous alloys, e.g. steel alloys containing chromium 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
-
- 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
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)
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
The invention discloses a kind of spheroidizing method of low-carbon steel, the cold-forging steel is heated to >=718 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 665~715 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 >=67%, elongation >=38% of product；Another distinguishing feature can also realize spheroidizing well in the case where plastic-less deformation.
Description
Technical field
The present invention relates to one kind to belong to metallurgical technology field, especially a kind of spheroidizing method of low-carbon steel.
Background technique
Low-carbon steel is mild steel, is widely used in the products such as production drawn steel wire, 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 low-carbon steel
It still will appear cold heading cracking phenomenon after the softening of conventional spheroidizing.This is mainly due to the carbonizations in the steel after spheroidizing
Composition granule major part intercrystalline precipitation, reduces 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 the low-carbon of plastic-less deformation
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 low-carbon 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 >=718 DEG C,
Soaking time presses 3.3~4.3mm/min effective cross-section THICKNESS CALCULATION；It is cooled to≤200 DEG C fastly；Then 665~715 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 25~35 DEG C/s.
Furnace cooling of the present invention is to 400 DEG C and following.
The chemical component and weight percentage of low-carbon steel of the present invention are as follows: C 0.17%~0.24%, Si 0.17%
~0.37%, Mn 0.35%~0.65%, Cr≤0.25%, Ni≤0.25%, Cu≤0.25%, 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 >=67%, elongation >=38% 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 low-carbon steel uses following techniques.
(1) product composition: selecting the hot rolling disk circle low-carbon steel of 5.5~6.5mm of diameter to be produced, each embodiment steel
Chemical component and weight percentage are shown in Table 1.
Table 1: the chemical component (wt) of each embodiment steel
In table 1, surplus is Fe and impurity element.
(2)-the technical process of furnace cooling method and process: is kept the temperature using heating-heat preservation-rapid cooling-reheating-again.
>=718 DEG C it is heated in air furnace, first time heating temperature is higher than austenitizing temperature, i.e.,；In order to allow the surface and inside of steel
Reach austenitizing temperature, is kept the temperature；The shorter steel temperature the better in the austenitizing temperature heat preservation residence time, the purpose is to
In order to allow C to be unevenly distributed in steel, soaking time presses 3.3~4.3mm/min effective cross-section THICKNESS CALCULATION.When rapid cooling, with 25
The cooling rate of~35 DEG C/s is cooled to 200 DEG C and less.The temperature of reheating be 665~715 DEG C, then soaking time be 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 low-carbon steel, it is characterised in that: the cold-forging steel is heated to >=718 DEG C, soaking time
By 3.3~4.3mm/min effective cross-section THICKNESS CALCULATION；It is cooled to≤200 DEG C fastly；Then 665~715 DEG C are again heated to, heat preservation 6
~20h；Last furnace cooling.
2. a kind of spheroidizing method of low-carbon steel according to claim 1, it is characterised in that: the cooling of the rapid cooling
Rate is 25~35 DEG C/s.
3. a kind of spheroidizing method of low-carbon 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 low-carbon steel according to claim 1,2 or 3, which is characterized in that the low-carbon
The chemical component and weight percentage of number steel are as follows: C 0.17%~0.24%, Si 0.17%~0.37%, Mn 0.35%~
0.65%, Cr≤0.25%, Ni≤0.25%, Cu≤0.25%, remaining is Fe and impurity element.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811519779.2A CN109628713B (en) | 2018-12-12 | 2018-12-12 | Spheroidizing annealing method of low-carbon steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811519779.2A CN109628713B (en) | 2018-12-12 | 2018-12-12 | Spheroidizing annealing method of low-carbon steel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109628713A true CN109628713A (en) | 2019-04-16 |
| CN109628713B CN109628713B (en) | 2020-11-06 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811519779.2A Expired - Fee Related CN109628713B (en) | 2018-12-12 | 2018-12-12 | Spheroidizing annealing method of low-carbon steel |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109628713B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112058912A (en) * | 2020-09-09 | 2020-12-11 | 广东韶钢松山股份有限公司 | Ultra-low carbon steel wire rod and steel wire and preparation method thereof |
| CN115125435A (en) * | 2022-05-25 | 2022-09-30 | 江苏现代综合特殊钢有限公司 | Cold heading steel, preparation method thereof and method for preparing steel wire by adopting cold heading steel |
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 |
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| 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 CN201811519779.2A patent/CN109628713B/en not_active Expired - Fee Related
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 |
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| Title |
|---|
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112058912A (en) * | 2020-09-09 | 2020-12-11 | 广东韶钢松山股份有限公司 | Ultra-low carbon steel wire rod and steel wire and preparation method thereof |
| CN112058912B (en) * | 2020-09-09 | 2022-06-10 | 广东韶钢松山股份有限公司 | Ultra-low carbon steel wire rod and steel wire and preparation method thereof |
| CN115125435A (en) * | 2022-05-25 | 2022-09-30 | 江苏现代综合特殊钢有限公司 | Cold heading steel, preparation method thereof and method for preparing steel wire by adopting cold heading steel |
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| CN109628713B (en) | 2020-11-06 |
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