CN110257597A - A kind of heat treatment process of boracic 60Si2Mn spring steel - Google Patents
A kind of heat treatment process of boracic 60Si2Mn spring steel Download PDFInfo
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- CN110257597A CN110257597A CN201910651265.0A CN201910651265A CN110257597A CN 110257597 A CN110257597 A CN 110257597A CN 201910651265 A CN201910651265 A CN 201910651265A CN 110257597 A CN110257597 A CN 110257597A
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- 238000000034 method Methods 0.000 title claims abstract description 60
- 230000008569 process Effects 0.000 title claims abstract description 51
- 229910000639 Spring steel Inorganic materials 0.000 title claims abstract description 40
- 238000010438 heat treatment Methods 0.000 title claims abstract description 35
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 88
- 239000010959 steel Substances 0.000 claims abstract description 88
- 238000001816 cooling Methods 0.000 claims abstract description 48
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 29
- 238000010791 quenching Methods 0.000 claims abstract description 17
- 230000000171 quenching effect Effects 0.000 claims abstract description 17
- 238000005496 tempering Methods 0.000 claims abstract description 13
- 239000000110 cooling liquid Substances 0.000 claims description 17
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 claims description 12
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims description 12
- 239000007788 liquid Substances 0.000 claims description 12
- 239000013556 antirust agent Substances 0.000 claims description 9
- CIWBSHSKHKDKBQ-JLAZNSOCSA-N Ascorbic acid Chemical compound OC[C@H](O)[C@H]1OC(=O)C(O)=C1O CIWBSHSKHKDKBQ-JLAZNSOCSA-N 0.000 claims description 8
- 238000013268 sustained release Methods 0.000 claims description 7
- 239000012730 sustained-release form Substances 0.000 claims description 7
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 claims description 6
- 229910052796 boron Inorganic materials 0.000 claims description 6
- 239000003963 antioxidant agent Substances 0.000 claims description 5
- 230000003078 antioxidant effect Effects 0.000 claims description 5
- 235000006708 antioxidants Nutrition 0.000 claims description 5
- 241001122767 Theaceae Species 0.000 claims description 3
- 239000007864 aqueous solution Substances 0.000 claims description 2
- 235000010323 ascorbic acid Nutrition 0.000 claims description 2
- 239000011668 ascorbic acid Substances 0.000 claims description 2
- 229960005070 ascorbic acid Drugs 0.000 claims description 2
- 150000008442 polyphenolic compounds Chemical class 0.000 claims description 2
- 235000013824 polyphenols Nutrition 0.000 claims description 2
- 238000002791 soaking Methods 0.000 claims description 2
- 230000002459 sustained effect Effects 0.000 claims description 2
- 239000003795 chemical substances by application Substances 0.000 claims 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims 1
- 229910001566 austenite Inorganic materials 0.000 abstract description 3
- 230000009466 transformation Effects 0.000 abstract 1
- 230000000052 comparative effect Effects 0.000 description 4
- 229910000734 martensite Inorganic materials 0.000 description 4
- 239000002253 acid Substances 0.000 description 3
- ZZZCUOFIHGPKAK-UHFFFAOYSA-N D-erythro-ascorbic acid Natural products OCC1OC(=O)C(O)=C1O ZZZCUOFIHGPKAK-UHFFFAOYSA-N 0.000 description 2
- 229930003268 Vitamin C Natural products 0.000 description 2
- 238000005054 agglomeration Methods 0.000 description 2
- 230000002776 aggregation Effects 0.000 description 2
- 230000008602 contraction Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 235000019154 vitamin C Nutrition 0.000 description 2
- 239000011718 vitamin C Substances 0.000 description 2
- 229910000859 α-Fe Inorganic materials 0.000 description 2
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 239000011572 manganese Substances 0.000 description 1
- PYLLWONICXJARP-UHFFFAOYSA-N manganese silicon Chemical compound [Si].[Mn] PYLLWONICXJARP-UHFFFAOYSA-N 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000000725 suspension Substances 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
- C21D1/18—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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/008—Heat treatment of ferrous alloys containing Si
Abstract
The invention discloses a kind of heat treatment process of boracic 60Si2Mn spring steel, heat treatment process then chilling and is cooled to room temperature more than Heating Steel Ingots to austenite transformation temperature by twice cooling process；High tempering and Water Quenching are carried out to steel ingot again；Finally carry out average tempering processing, steel ingot is successively heated to two different temperature when average tempering, while eliminating the internal stress that quenching process is formed, the microstructure in steel can be changed, finally obtain a kind of obdurability with higher, the good spring steel of comprehensive mechanical property.
Description
Technical field
The invention belongs to technical field of steel production, and in particular to a kind of heat treatment process of boracic 60Si2Mn spring steel.
Background technique
60Si2Mn spring steel is widely used silicon-manganese spring steel, chemical component are as follows: C 0.56%~0.6%, Si
1.5%~2.0%, Mn 0.6%~0.9%, S≤0.035, density 7.85g/cm3, it is suitable for production and bears larger load
Flat spring or line footpath in 30mm helical spring below, but existing 60Si2Mn spring steel toughness is insufficient, is using
The problem of fatigue damage is easy to appear in journey seriously affects the physical life of component.
Automobile leaf spring is load-bearing part important in automobile suspension system, while the car is driving, autobody sheet bullet
Spring will bear the effect of various stress, and most important stress is alternating bending stress, bring fatigue damage to steel plate.Due to work
Make inclement condition, has strict demand to the mechanical property of automobile leaf spring steel.
The mechanical property of spring steel depends primarily on heat treatment process, is mainly heat-treated at present by two kinds during spring processed
Technique reheats quenching technical and immediate quenching technique, although can a degree of raising bullet using both techniques
The toughness of spring steel, but the yield strength of steel can not be improved well, it still cannot be in severe working environment
It uses.
There are many purposes of the B in steel, and rigid harden ability can be improved, and improve rigid processing hardening.Since B is to steel
The mechanical property of material has preferable castering action, is now widely used in the preparation of special rolling-mill section.
Summary of the invention
For the above-mentioned prior art, the present invention provides a kind of heat treatment process of boracic 60Si2Mn spring steel, to solve
The problem that 60Si2Mn spring steel toughness is insufficient, yield strength is low.
In order to achieve the above object, the technical scheme adopted by the invention is that: a kind of boracic 60Si2Mn spring steel is provided
Heat treatment process, used boracic 60Si2Mn spring steel is provided by certain domestic steel mill in the present invention, in 60Si2Mn spring steel
The content of boron is 0.0005%~0.002% by percentage to the quality；The heat treatment process of spring steel of the present invention includes following step
It is rapid:
S1: being heated to 950~1000 DEG C for the tempering of the steel ingot of boracic 60Si2Mn spring steel, then it is quickly cooled to 800~
850 DEG C, then steel ingot is cooled to 450~480 DEG C through the first cooling process, steel ingot is cooled to room through the second cooling process after
Temperature；Wherein,
First cooling process: steel ingot is first cooled to 590~630 DEG C using water cooling liquid, then with the cooling of 8~12 DEG C/s
Rate is air-cooled to 450~480 DEG C；
Second cooling process: quenching liquid is used to be cooled to room temperature steel ingot with the cooling rate of 15~20 DEG C/s；
S2: 860~900 DEG C will be heated to the rate of heat addition of 5~10 DEG C/s by the steel ingot of S1 processing, keep the temperature 2~4h
Water quenching is to 120~150 DEG C afterwards；
S3: with the rate of heat addition of 15~20 DEG C/min will by S2 treated steel ingot is successively heated to 420~450 DEG C and
480~520 DEG C, and 2~3h is kept the temperature respectively, steel ingot is then cooled to 40~60 DEG C with water cooling liquid, is added in Xiang Shuileng liquid slow
Antirust agent and antioxidant are released, water cooling to room temperature completes the heat treatment of steel.
Heat treatment process can do improvement further below:
Further, the first cooling process first uses water cooling liquid that steel ingot is cooled to 600 DEG C in S1, then with the cold of 10 DEG C/s
But rate is air-cooled to 470 DEG C；Second cooling process uses quenching liquid to be cooled to room temperature steel ingot with the cooling rate of 18 DEG C/s.
Further, Heating Steel Ingots rate is 8 DEG C/s in S2, and steel ingot finishing temperature is 880 DEG C, soaking time 3h.
Further, steel ingot is successively heated to the rate of heat addition of 17 DEG C/min by 440 DEG C and 490 DEG C in S3, and protected respectively
Warm 2.5h.
Heat treatment process of the invention is first by Heating Steel Ingots to 950~1000 DEG C, and steel ingot interior tissue is difficult to understand at this temperature
Then family name's body is handled by very fast cooling and the first cooling process, the austenite inside steel ingot is gradually changed into martensite,
Hardness, wearability, toughness and the elasticity of spring steel improve, and then carry out air-cooled processing, wind using the cooling velocity of 8~12 DEG C/s
The cold water cooling liquid that can not only quickly dry up surface of steel ingot remnants, and can guarantee that each position cooling rate of steel ingot is consistent, it can be effective
It avoids the problem that causing steel ingot internal structure to be unevenly distributed because heat is unevenly distributed, promotes the mechanical property of spring steel.
860~900 DEG C will be heated to the rate of heat addition of 5~10 DEG C/s with the steel ingot after cooling treatment by tempering heating
Hardening heat, martensite changes to austenite during heating, and then water quenching is endless inside spring steel to 120~150 DEG C
Whole martensite tends to completely, and steel mechanics performance is promoted.
Average tempering processing finally is carried out to steel ingot, tempering is divided to two sections of progress, steel ingot is tempered to 420~450 DEG C first,
At this temperature, the internal stress formed in quenching process can be eliminated, internal defects of steel is eliminated；Then extremely by Heating Steel Ingots
480~520 DEG C, at this temperature, quenched martensite decomposes, and steel ingot interior tissue is the tempering Qu Shiti of fine uniform, and
The ferrite of needle shape becomes smaller, the non-agglomeration of carbide particle, finally obtained spring steel obdurability with higher, comprehensive
Good mechanical properties.
Further, water cooling liquid is the aqueous solution of citric acid and acetic acid, and wherein the mass concentration of citric acid is 0.1~0.4g/
ML, the mass concentration of acetic acid are 0.05~0.15g/mL.
Using weak acid solution as water cooling liquid in the present invention, the oxide that can quickly remove steel surface is miscellaneous with other
Matter can reduce influence of the oxide to steel mechanics performance.
Further, sustained release antirust agent is that BTA is sustained antirust agent；Antioxidant is tea polyphenols or ascorbic acid.
The present invention adds sustained release antirust agent and antioxidant in water cooling liquid, can form antirust coat on the surface of steel,
Promote the corrosion-resistant property of steel.
The beneficial effects of the present invention are: 60Si2Mn spring steel can be significantly changed using the heat treatment process in the present invention
Internal structure, steel ingot interior tissue is the tempering Qu Shiti of fine uniform, and the ferrite of needle shape becomes smaller, carbide particle
Non- agglomeration, finally obtained spring steel obdurability with higher, comprehensive mechanical property are good.
Specific embodiment
Below with reference to embodiment, specific embodiments of the present invention will be described in detail.
Embodiment one
A kind of heat treatment process of boracic 60Si2Mn spring steel, the content of boron is by percentage to the quality in steel ingot
0.001%；Heat treatment process the following steps are included:
S1: the steel ingot tempering of boracic 60Si2Mn spring steel is heated to 980 DEG C, is then quickly cooled to 820 DEG C, then pass through
Steel ingot is cooled to 470 DEG C by the first cooling process, is cooled to room temperature steel ingot through the second cooling process after；Wherein,
First cooling process: being first cooled to 600 DEG C for steel ingot using water cooling liquid, then air-cooled with the cooling rate of 10 DEG C/s
To 470 DEG C；
Second cooling process: quenching liquid is used to be cooled to room temperature steel ingot with the cooling rate of 18 DEG C/s；
S2: will be heated to 880 DEG C by the steel ingot of S1 processing with the rate of heat addition of 8 DEG C/s, keep the temperature after 3h water quenching to 120
℃；
S3: with the rate of heat addition of 17 DEG C/min will treated that steel ingot is successively heated to 440 DEG C and 490 DEG C by S2, and
2.5h is kept the temperature respectively, and steel ingot is then cooled to 50 DEG C with water cooling liquid, BTA sustained release antirust agent is added in Xiang Shuileng liquid and tea is more
Phenol, water cooling to room temperature complete the heat treatment of steel.
Embodiment two
A kind of heat treatment process of boracic 60Si2Mn spring steel, the content of boron is by percentage to the quality in steel ingot
0.002%；Heat treatment process the following steps are included:
S1: the steel ingot tempering of boracic 60Si2Mn spring steel is heated to 1000 DEG C, is then quickly cooled to 850 DEG C, then pass through
Steel ingot is cooled to 480 DEG C by the first cooling process, is cooled to room temperature steel ingot through the second cooling process after；Wherein,
First cooling process: being first cooled to 630 DEG C for steel ingot using water cooling liquid, then air-cooled with the cooling rate of 8 DEG C/s
To 480 DEG C；
Second cooling process: quenching liquid is used to be cooled to room temperature steel ingot with the cooling rate of 20 DEG C/s；
S2: will be heated to 900 DEG C by the steel ingot of S1 processing with the rate of heat addition of 10 DEG C/s, keep the temperature after 2h water quenching to 150
℃；
S3: with the rate of heat addition of 15 DEG C/min will treated that steel ingot is successively heated to 450 DEG C and 520 DEG C by S2, and
2h is kept the temperature respectively, and steel ingot is then cooled to 60 DEG C with water cooling liquid, BTA sustained release antirust agent and Vitamin C are added in Xiang Shuileng liquid
Acid, water cooling to room temperature complete the heat treatment of steel.
Embodiment three
A kind of heat treatment process of boracic 60Si2Mn spring steel, the content of boron is by percentage to the quality in steel ingot
0.0005%；Heat treatment process the following steps are included:
S1: the steel ingot tempering of boracic 60Si2Mn spring steel is heated to 950 DEG C, is then quickly cooled to 800 DEG C, then pass through
Steel ingot is cooled to 450 DEG C by the first cooling process, is cooled to room temperature steel ingot through the second cooling process after；Wherein,
First cooling process: being first cooled to 590 DEG C for steel ingot using water cooling liquid, then air-cooled with the cooling rate of 12 DEG C/s
To 450 DEG C；
Second cooling process: quenching liquid is used to be cooled to room temperature steel ingot with the cooling rate of 15 DEG C/s；
S2: will be heated to 860 DEG C by the steel ingot of S1 processing with the rate of heat addition of 5 DEG C/s, keep the temperature after 4h water quenching to 130
℃；
S3: with the rate of heat addition of 20 DEG C/min will treated that steel ingot is successively heated to 420 DEG C and 480 DEG C by S2, and
3h is kept the temperature respectively, and steel ingot is then cooled to 40 DEG C with water cooling liquid, BTA sustained release antirust agent and Vitamin C are added in Xiang Shuileng liquid
Acid, water cooling to room temperature complete the heat treatment of steel.
Comparative example one
The 60Si2Mn spring steel that boron content is 0.0026.
Comparative example two
60Si2Mn spring steel.
Interpretation of result
The mechanical property for detecting one to three gained boracic 60Si2Mn spring steel of embodiment, is as a result listed in table 1.In table, R0.2
(MPa): yield strength；Rm(MPa): tensile strength；A (%): elongation percentage；Z (%): the contraction percentage of area.
The mechanical property of 1 steel of table
| R0.2 | Rm | A | Z | |
| Embodiment one | 1681 | 1959 | 9.2 | 26.91 |
| Embodiment two | 1679 | 1951 | 9.1 | 26.89 |
| Embodiment three | 1682 | 1960 | 9.1 | 26.90 |
| Comparative example one | 1433 | 1604 | 7.8 | 25.79 |
| Comparative example two | 1176 | 1274 | 6.5 | 27.12 |
As can be seen from the table, by the yield strength and tension of treated the spring steel of the heat treatment process in the present invention
Intensity has different degrees of promotion, shows that heat treatment process has facilitation to the intensity of spring steel；And elongation percentage and
The contraction percentage of area also has different degrees of raising, shows that heat treatment process also has facilitation to the toughness of spring steel.Utilize this
Heat treatment process in invention handles boracic 60Si2Mn spring steel, and a kind of available good mechanical performance can satisfy severe
The spring steel of environment use condition.
Although be described in detail to a specific embodiment of the invention in conjunction with the embodiments, should not be construed as to this
The restriction of the protection scope of patent.In range described by claims, those skilled in the art are without creative work
The various modifications and deformation that can make still belong to the protection scope of this patent.
Claims (6)
1. a kind of heat treatment process of boracic 60Si2Mn spring steel, which comprises the following steps:
S1: the steel ingot tempering of boracic 60Si2Mn spring steel is heated to 950~1000 DEG C, is then quickly cooled to 800~850
DEG C, then steel ingot is cooled to 450~480 DEG C through the first cooling process, steel ingot is cooled to room temperature through the second cooling process after；
Wherein,
First cooling process: steel ingot is first cooled to 590~630 DEG C using water cooling liquid, then with the cooling rate of 8~12 DEG C/s
It is air-cooled to 450~480 DEG C；
Second cooling process: quenching liquid is used to be cooled to room temperature steel ingot with the cooling rate of 15~20 DEG C/s；
S2: 860~900 DEG C will be heated to the rate of heat addition of 5~10 DEG C/s by the steel ingot of S1 processing, keep the temperature water after 2~4h
It quenches to 120~150 DEG C；
S3: with the rate of heat addition of 15~20 DEG C/min will treated that steel ingot is successively heated to 420~450 DEG C and 480 by S2
~520 DEG C, and 2~3h is kept the temperature respectively, steel ingot is then cooled to 40~60 DEG C with water cooling liquid, it is anti-that sustained release is added in Xiang Shuileng liquid
Rust agent and antioxidant, water cooling to room temperature complete the heat treatment of steel；
The content of boron is 0.0005%~0.002% by percentage to the quality in the steel ingot.
2. technique according to claim 1, it is characterised in that: the first cooling process first uses water cooling liquid that steel ingot is cold in S1
But then air-cooled to 470 DEG C with the cooling rate of 10 DEG C/s to 600 DEG C；Second cooling process uses quenching liquid with 18 DEG C/s's
Steel ingot is cooled to room temperature by cooling rate.
3. technique according to claim 1, it is characterised in that: Heating Steel Ingots rate is 8 DEG C/s in S2, and steel ingot finishing temperature is
880 DEG C, soaking time 3h.
4. technique according to claim 1, it is characterised in that: successively added steel ingot with the rate of heat addition of 17 DEG C/min in S3
Heat keeps the temperature 2.5h to 440 DEG C and 490 DEG C respectively.
5. technique according to claim 1, it is characterised in that: the water cooling liquid is the aqueous solution of citric acid and acetic acid,
The mass concentration of middle citric acid is 0.1~0.4g/mL, and the mass concentration of acetic acid is 0.05~0.15g/mL.
6. technique according to claim 1, it is characterised in that: the sustained release antirust agent is that BTA is sustained antirust agent；It is described anti-
Oxidant is tea polyphenols or ascorbic acid.
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