CN105950839A - Cr12MoV spheroidizing annealing technology - Google Patents
Cr12MoV spheroidizing annealing technology Download PDFInfo
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- CN105950839A CN105950839A CN201610454933.7A CN201610454933A CN105950839A CN 105950839 A CN105950839 A CN 105950839A CN 201610454933 A CN201610454933 A CN 201610454933A CN 105950839 A CN105950839 A CN 105950839A
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- cr12mov
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- cr12mov steel
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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
- C21D6/002—Heat treatment of ferrous alloys containing Cr
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
The invention discloses a Cr12MoV spheroidizing annealing technology. The Cr12MoV spheroidizing annealing technology comprises the following steps of: (1) heating Cr12MoV steel at a temperature slightly lower than Ac1 for a long time; (2) heating the Cr12MoV steel at a temperature between Ac1 and Acm, carrying out heat preservation on the Cr12MoV steel and then slowly cooling the Cr12MoV steel; and (3) heating the Cr12MoV steel at a temperature between Ac1 and Acm, carrying out heat preservation on the Cr12MoV steel, then slowly cooling the Cr12MoV steel to a temperature below Ar1 and carrying out heat preservation on the Cr12MoV steel till completing transformation. The Cr12MoV spheroidizing annealing technology has the advantages that the distribution of carbides is uniform, and the aggregation of the carbides is avoided; carbide particles are tiny; and the occurrence of large ferritic structures is avoided; and crystal grains are refined, the hardness is reduced, and the cutting machining property is improved, thereby preparing structures for quenching.
Description
Technical field
The present invention relates to metallurgical technology field, be specifically related to Cr12MoV annealing process.
Background technology
The current production capacity of China's steel industry is superfluous, 12.9 grades of high terminal bolts of a large amount of import of China simultaneously
With steel, such as safe classes such as engine cylinder bonnet bolt, connecting-rod bolts, bolt of main bearing cap, bolts of flywheel
Higher bolting steel, this parts are affected by high-frequency alternating load, and work under bad environment is the most right
Fatigue life, index request was the harshest, was a kind of widely used high-end cold-heading product.Cr12MoV is
A kind of widely used cold work die steel, has high rigidity, high intensity, high-wearing feature and quenching distortion little etc.
Advantage, but its hardness is high, it is difficult to carry out machining, and easily produce hardening flaw, therefore raw in industry
During product, carry out crystal grain thinning frequently with isothermal spheroidizing, reduce hardness, improve machinability,
Carry out tissue for quenching to prepare.
Summary of the invention
Present invention aim to address existing technological deficiency, it is provided that Cr12MoV annealing process, carry
The spheroidizing efficiency of high Cr12MoV steel, improves spheroidizing effect.
For solving technical problem described in background technology, the present invention by the following technical solutions: Cr12MoV
Annealing process, it comprises the following steps,
1) by Cr12MoV steel long-time heating at a temperature of slightly less than Ac1；
2) then by Slow cooling after Cr12MoV steel temperature heating and thermal insulation between Ac1-Acm；
3) finally after Cr12MoV steel temperature heating and thermal insulation between Ac1-Acm, below Ar1 is progressively cooled to
Temperature, completes to transformation.
Preferably, described step 1) in the temperature 650 DEG C of long-time heating, warm 3h, then in step
2) in increase firing rate be heated to 860 DEG C to 80 DEG C/h, insulation 3-4h after in step 3) in stove with 20 DEG C
The speed of/h is cooled to 750 DEG C and comes out of the stove air cooling to room temperature at insulation 4-5h.
Preferably, HB≤240 of the Cr12MoV steel after spheroidizing, eutectic carbide grade≤3 grade.
The invention has the beneficial effects as follows: distribution of carbides is uniform, it is to avoid the gathering of carbide occurs；Carbonization
Composition granule is tiny；Avoid the appearance of bulk ferritic structure；Crystal grain thinning, reduction hardness, improve cutting
Processing characteristics, carries out tissue for quenching and prepares.
Accompanying drawing explanation
Fig. 1 is the concrete technology flow chart in the present invention.
Detailed description of the invention
Embodiment one
Cr12MoV annealing process, it comprises the following steps,
1) by Cr12MoV steel long-time heating at a temperature of slightly less than Ac1；
2) then by Slow cooling after Cr12MoV steel temperature heating and thermal insulation between Ac1-Acm；
3) finally after Cr12MoV steel temperature heating and thermal insulation between Ac1-Acm, below Ar1 is progressively cooled to
Temperature, completes to transformation.
Described step 1) in the temperature 650 DEG C of long-time heating, warm 3h, then in step 2) in increase
Add firing rate and be heated to 860 DEG C to 80 DEG C/h, insulation 3-4h after in step 3) in stove with 20 DEG C/h
Speed be cooled to 750 DEG C insulation 4-5h come out of the stove air cooling to room temperature.
The HB of the Cr12MoV steel after spheroidizing is 200, and eutectic carbide grade is 3 grades.
Embodiment two
Cr12MoV annealing process, it comprises the following steps,
1) by Cr12MoV steel long-time heating at a temperature of slightly less than Ac1；
2) then by Slow cooling after Cr12MoV steel temperature heating and thermal insulation between Ac1-Acm；
3) finally after Cr12MoV steel temperature heating and thermal insulation between Ac1-Acm, below Ar1 is progressively cooled to
Temperature, completes to transformation.
Described step 1) in the temperature 650 DEG C of long-time heating, warm 3h, then in step 2) in increase
Add firing rate and be heated to 860 DEG C to 80 DEG C/h, insulation 3-4h after in step 3) in stove with 20 DEG C/h
Speed be cooled to 750 DEG C insulation 4-5h come out of the stove air cooling to room temperature.
The HB of the Cr12MoV steel after spheroidizing is 240, eutectic carbide grade 2 grades.
Embodiment three
Cr12MoV annealing process, it comprises the following steps,
1) by Cr12MoV steel long-time heating at a temperature of slightly less than Ac1；
2) then by Slow cooling after Cr12MoV steel temperature heating and thermal insulation between Ac1-Acm；
3) finally after Cr12MoV steel temperature heating and thermal insulation between Ac1-Acm, below Ar1 is progressively cooled to
Temperature, completes to transformation.
Described step 1) in the temperature 650 DEG C of long-time heating, warm 3h, then in step 2) in increase
Add firing rate and be heated to 860 DEG C to 80 DEG C/h, insulation 3-4h after in step 3) in stove with 20 DEG C/h
Speed be cooled to 750 DEG C insulation 4-5h come out of the stove air cooling to room temperature.
The HB of the Cr12MoV steel after spheroidizing is 200, eutectic carbide grade 1 grade.
Claims (3)
1.Cr12MoV annealing process, it is characterised in that it comprises the following steps,
1) by Cr12MoV steel long-time heating at a temperature of slightly less than Ac1；
2) then by Slow cooling after Cr12MoV steel temperature heating and thermal insulation between Ac1-Acm；
3) finally after Cr12MoV steel temperature heating and thermal insulation between Ac1-Acm, below Ar1 is progressively cooled to
Temperature, completes to transformation.
Cr12MoV annealing process the most according to claim 1, it is characterised in that described
Step 1) in the temperature 650 DEG C of long-time heating, warm 3h, then in step 2) in increase firing rate
Be heated to 860 DEG C to 80 DEG C/h, in step 3 after insulation 3-4h) in cool down with the speed of 20 DEG C/h with stove
Come out of the stove air cooling to room temperature at insulation 4-5h to 750 DEG C.
Cr12MoV annealing process the most according to claim 1, it is characterised in that nodularization is moved back
HB≤240 of the Cr12MoV steel after fire, eutectic carbide grade≤3 grade.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610454933.7A CN105950839A (en) | 2016-06-20 | 2016-06-20 | Cr12MoV spheroidizing annealing technology |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610454933.7A CN105950839A (en) | 2016-06-20 | 2016-06-20 | Cr12MoV spheroidizing annealing technology |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201610454933.7A Pending CN105950839A (en) | 2016-06-20 | 2016-06-20 | Cr12MoV spheroidizing annealing technology |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1540001A (en) * | 2003-11-01 | 2004-10-27 | 湖南科技大学 | Isothermal spheroidizing technique for H13 steel |
| CN104017965A (en) * | 2014-06-24 | 2014-09-03 | 南车眉山车辆有限公司 | Treatment process for improving toughness of Cr12MoV steel |
| CN104745780A (en) * | 2015-03-17 | 2015-07-01 | 辽宁金钢重型锻造有限公司 | Production method for forging and thermally treating Cr12MoV steel |
| CN105331789A (en) * | 2015-10-29 | 2016-02-17 | 武汉理工大学 | Heat treatment method for die casting insert for automobile body |
-
2016
- 2016-06-20 CN CN201610454933.7A patent/CN105950839A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1540001A (en) * | 2003-11-01 | 2004-10-27 | 湖南科技大学 | Isothermal spheroidizing technique for H13 steel |
| CN104017965A (en) * | 2014-06-24 | 2014-09-03 | 南车眉山车辆有限公司 | Treatment process for improving toughness of Cr12MoV steel |
| CN104745780A (en) * | 2015-03-17 | 2015-07-01 | 辽宁金钢重型锻造有限公司 | Production method for forging and thermally treating Cr12MoV steel |
| CN105331789A (en) * | 2015-10-29 | 2016-02-17 | 武汉理工大学 | Heat treatment method for die casting insert for automobile body |
Non-Patent Citations (1)
| Title |
|---|
| 程芳 等: "Cr12MoV钢冷挤压模具的热处理工艺", 《河南机电高等专科学校学报》 * |
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Application publication date: 20160921 |