CN106119476B - A kind of hardening and tempering process of 42CrMo large forgings - Google Patents
A kind of hardening and tempering process of 42CrMo large forgings Download PDFInfo
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- CN106119476B CN106119476B CN201610454355.7A CN201610454355A CN106119476B CN 106119476 B CN106119476 B CN 106119476B CN 201610454355 A CN201610454355 A CN 201610454355A CN 106119476 B CN106119476 B CN 106119476B
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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
- C21D1/18—Hardening; Quenching with or without subsequent tempering
- C21D1/25—Hardening, combined with annealing between 300 degrees Celsius and 600 degrees Celsius, i.e. heat refining ("Vergüten")
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Abstract
A kind of hardening and tempering process of 42CrMo large forgings, belongs to 42CrMo large forgings processing technique fields, which is to comprise the steps of：(1) 42CrMo large forgings is air-cooled to 600~750 DEG C；(2) the 42CrMo large forgings after will be air-cooled is fitted into normalizing in stove；(3) the 42CrMo large forgings shove charges after normalizing are waited to expect；(4) 700~800 DEG C are heated to after 42CrMo large forgings temperature is uniform, is then once kept the temperature；(5) the 42CrMo large forgings after once keeping the temperature is heated to 830~850 DEG C, then carries out secondary insulation；(6) the 42CrMo large forgings of secondary insulation is subjected to a water cooling, then water outlet；(7) the 42CrMo large forgings shove charge after water cooling is tempered, progress secondary water is cold after tempering, and then water outlet, obtains 42CrMo large forgings.The present invention can eliminate the interior forging stress and structural stress of 42CrMo large forgings；The present invention can be with crystal grain thinning, uniform texture；Crystallization, phase transformation the invention enables 42CrMo large forgings is easy, and diffusion inside is easy.
Description
Technical field
The invention belongs to 42CrMo large forgings processing technique fields, more particularly to a kind of 42CrMo large forgings is quenched
Technique.
Background technology
42CrMo is that a kind of comprehensive mechanical performance is good, and intensity is high, the good medium carbon alloy steel of quenching property, in machine-building
Industry is used to manufacture the important components such as macrotype axes series, large gear.Since 42CrMo large forgings feature dimensions are big, defect is more,
Internal stress is big, temperature distributing disproportionation, and crystallization, mutually complicate, and diffusion inside is difficult, and 42CrMo large forgings in addition is mostly important portion
Position workpiece, stress is heavy, and technical requirement is high, therefore 42CrMo heavy forgings not only want crystal grain thinning, and uniform texture, disappears
Except internal stress, also to reach necessary performance requirement, it is necessary to realize by rational heat treatment process.
The content of the invention
The technical problems to be solved by the invention are to provide a kind of hardening and tempering process of 42CrMo large forgings.
To solve the above problems, a kind of hardening and tempering process of 42CrMo large forgings of the present invention, the technique be by with
Lower step composition：
(1) 42CrMo large forgings is air-cooled to 600~750 DEG C；
(2) the 42CrMo large forgings after will be air-cooled is fitted into normalizing in stove, prevents from cracking, crystal grain thinning；
(3) the 42CrMo large forgings shove charges after normalizing are waited to expect, it is 300~400 DEG C to treat material temperature degree, the supply delay time 2
~4 it is small when；
(4) 700~800 DEG C are heated to after 42CrMo large forgings temperature is uniform, firing rate is 70~90 DEG C/h, then
Once kept the temperature, when soaking time is 2~4 small；
(5) the 42CrMo large forgings after once keeping the temperature is heated to 830~850 DEG C, then carries out secondary insulation, kept the temperature
When time is T small, soaking time is calculated with 100mm/h；
(6) the 42CrMo large forgings of secondary insulation is subjected to a water cooling, water cooling is to 160~200 DEG C, then water outlet；
(7) by the 42CrMo large forgings after water cooling, when 4~6 is small, interior shove charge is tempered, and temperature is 550~570 DEG C,
Soaking time is calculated by 100mm/1.5h, and progress secondary water is cold after tempering, and water cooling to room temperature, then water outlet, obtains hardness HRC30
~35, it is organized as the 42CrMo large forgings of tempered sorbite.
Compared with prior art, the present invention has the following advantages：The present invention can eliminate the interior forging of 42CrMo large forgings
Make stress and structural stress；The present invention can be with crystal grain thinning, uniform texture；The invention enables the knot of 42CrMo large forgings
Crystalline substance, phase transformation are easy, and diffusion inside is easy.
Embodiment
Embodiment 1
A kind of hardening and tempering process of 42CrMo large forgings, which is to comprise the steps of：
(1) 42CrMo large forgings is air-cooled to 600 DEG C；
(2) the 42CrMo large forgings after will be air-cooled is fitted into normalizing in stove, prevents from cracking, crystal grain thinning；
(3) the 42CrMo large forgings shove charges after normalizing are waited to expect, it is 300 DEG C to treat material temperature degree, when the supply delay time is 2 small；
(4) 700 DEG C are heated to after 42CrMo large forgings temperature is uniform, firing rate is 70 DEG C/h, is then carried out once
Insulation, when soaking time is 2 small；
(5) the 42CrMo large forgings after once keeping the temperature is heated to 830 DEG C, then carries out secondary insulation, soaking time
For T it is small when, soaking time is calculated with 100mm/h；
(6) the 42CrMo large forgings of secondary insulation is subjected to a water cooling, water cooling is to 160 DEG C, then water outlet；
(7) by the 42CrMo large forgings after water cooling, when 4 is small, interior shove charge is tempered, and temperature is 550 DEG C, soaking time
Calculated by 100mm/1.5h, progress secondary water is cold after tempering, and water cooling to room temperature, then water outlet, obtains hardness HRC30, be organized as
The 42CrMo large forgings of tempered sorbite.
It is demonstrated experimentally that the interior forging stress and structural stress of 42CrMo large forgings are smaller under this parameter, crystallization and phase transformation
It is easier to.
Embodiment 2
A kind of hardening and tempering process of 42CrMo large forgings, which is to comprise the steps of：
(1) 42CrMo large forgings is air-cooled to 640 DEG C；
(2) the 42CrMo large forgings after will be air-cooled is fitted into normalizing in stove, prevents from cracking, crystal grain thinning；
(3) the 42CrMo large forgings shove charges after normalizing are waited to expect, it is 325 DEG C to treat material temperature degree, and the supply delay time is small for 2.5
When；
(4) 730 DEG C are heated to after 42CrMo large forgings temperature is uniform, firing rate is 75 DEG C/h, is then carried out once
Insulation, when soaking time is 2.5 small；
(5) the 42CrMo large forgings after once keeping the temperature is heated to 835 DEG C, then carries out secondary insulation, soaking time
For T it is small when, soaking time is calculated with 100mm/h；
(6) the 42CrMo large forgings of secondary insulation is subjected to a water cooling, water cooling is to 170 DEG C, then water outlet；
(7) by the 42CrMo large forgings after water cooling, when 4.5 is small, interior shove charge is tempered, and temperature is 555 DEG C, during insulation
Between by 100mm/1.5h calculate, after tempering carry out secondary water it is cold, water cooling to room temperature, then water outlet, obtains hardness HRC32, tissue
For the 42CrMo large forgings of tempered sorbite.
It is demonstrated experimentally that the interior forging stress and structural stress of 42CrMo large forgings are small under this parameter, crystallization and phase transformation compared with
Easily.
Embodiment 3
A kind of hardening and tempering process of 42CrMo large forgings, which is to comprise the steps of：
(1) 42CrMo large forgings is air-cooled to 675 DEG C；
(2) the 42CrMo large forgings after will be air-cooled is fitted into normalizing in stove, prevents from cracking, crystal grain thinning；
(3) the 42CrMo large forgings shove charges after normalizing are waited to expect, it is 350 DEG C to treat material temperature degree, when the supply delay time is 3 small；
(4) 750 DEG C are heated to after 42CrMo large forgings temperature is uniform, firing rate is 80 DEG C/h, is then carried out once
Insulation, when soaking time is 3 small；
(5) the 42CrMo large forgings after once keeping the temperature is heated to 840 DEG C, then carries out secondary insulation, soaking time
For T it is small when, soaking time is calculated with 100mm/h；
(6) the 42CrMo large forgings of secondary insulation is subjected to a water cooling, water cooling is to 180 DEG C, then water outlet；
(7) by the 42CrMo large forgings after water cooling, when 5 is small, interior shove charge is tempered, and temperature is 560 DEG C, soaking time
Calculated by 100mm/1.5h, progress secondary water is cold after tempering, and water cooling to room temperature, then water outlet, obtains hardness HRC33, be organized as
The 42CrMo large forgings of tempered sorbite.
It is demonstrated experimentally that the interior forging stress and structural stress of 42CrMo large forgings are minimum under this parameter, crystallization and phase transformation
It is easiest to.
Therefore, the present embodiment is preferred embodiment.
Embodiment 4
A kind of hardening and tempering process of 42CrMo large forgings, which is to comprise the steps of：
(1) 42CrMo large forgings is air-cooled to 720 DEG C；
(2) the 42CrMo large forgings after will be air-cooled is fitted into normalizing in stove, prevents from cracking, crystal grain thinning；
(3) the 42CrMo large forgings shove charges after normalizing are waited to expect, it is 370 DEG C to treat material temperature degree, and the supply delay time is small for 3.5
When；
(4) 770 DEG C are heated to after 42CrMo large forgings temperature is uniform, firing rate is 85 DEG C/h, is then carried out once
Insulation, when soaking time is 3.5 small；
(5) the 42CrMo large forgings after once keeping the temperature is heated to 845 DEG C, then carries out secondary insulation, soaking time
For T it is small when, soaking time is calculated with 100mm/h；
(6) the 42CrMo large forgings of secondary insulation is subjected to a water cooling, water cooling is to 190 DEG C, then water outlet；
(7) by the 42CrMo large forgings after water cooling, when 5.5 is small, interior shove charge is tempered, and temperature is 565 DEG C, during insulation
Between by 100mm/1.5h calculate, after tempering carry out secondary water it is cold, water cooling to room temperature, then water outlet, obtains hardness HRC34, tissue
For the 42CrMo large forgings of tempered sorbite.
It is demonstrated experimentally that the interior forging stress and structural stress of 42CrMo large forgings are small under this parameter, crystallization and phase transformation compared with
Easily.
Embodiment 5
A kind of hardening and tempering process of 42CrMo large forgings, which is to comprise the steps of：
(1) 42CrMo large forgings is air-cooled to 750 DEG C；
(2) the 42CrMo large forgings after will be air-cooled is fitted into normalizing in stove, prevents from cracking, crystal grain thinning；
(3) the 42CrMo large forgings shove charges after normalizing are waited to expect, it is 400 DEG C to treat material temperature degree, when the supply delay time is 4 small；
(4) 800 DEG C are heated to after 42CrMo large forgings temperature is uniform, firing rate is 90 DEG C/h, is then carried out once
Insulation, when soaking time is 4 small；
(5) the 42CrMo large forgings after once keeping the temperature is heated to 850 DEG C, then carries out secondary insulation, soaking time
For T it is small when, soaking time is calculated with 100mm/h；
(6) the 42CrMo large forgings of secondary insulation is subjected to a water cooling, water cooling is to 200 DEG C, then water outlet；
(7) by the 42CrMo large forgings after water cooling, when 6 is small, interior shove charge is tempered, and temperature is 570 DEG C, soaking time
Calculated by 100mm/1.5h, progress secondary water is cold after tempering, and water cooling to room temperature, then water outlet, obtains hardness HRC35, be organized as
The 42CrMo large forgings of tempered sorbite.
It is demonstrated experimentally that the interior forging stress and structural stress of 42CrMo large forgings are smaller under this parameter, crystallization and phase transformation
It is easier to.
Claims (5)
- A kind of 1. hardening and tempering process of 42CrMo large forgings, it is characterised in that：The technique is to comprise the steps of：(1) 42CrMo large forgings is air-cooled to 600~750 DEG C；(2) the 42CrMo large forgings after will be air-cooled is fitted into normalizing in stove, prevents from cracking, crystal grain thinning；(3) the 42CrMo large forgings shove charges after normalizing are waited to expect, it is 300~400 DEG C to treat material temperature degree, and the supply delay time is small for 2~4 When；(4) 700~800 DEG C are heated to after 42CrMo large forgings temperature is uniform, firing rate is 70~90 DEG C/h, is then carried out Once keep the temperature, when soaking time is 2~4 small；(5) the 42CrMo large forgings after once keeping the temperature is heated to 830~845 DEG C, then carries out secondary insulation, soaking time For T it is small when, soaking time is calculated with 100mm/h；(6) the 42CrMo large forgings of secondary insulation is subjected to a water cooling, water cooling is to 160~200 DEG C, then water outlet；(7) by the 42CrMo large forgings after water cooling, when 4~6 is small, interior shove charge is tempered, and temperature is 550~570 DEG C, insulation Time by 100mm/1.5h calculate, after tempering carry out secondary water it is cold, water cooling to room temperature, then water outlet, obtain hardness HRC30~ 35, it is organized as the 42CrMo large forgings of tempered sorbite.
- A kind of 2. hardening and tempering process of 42CrMo large forgings according to claim 1, it is characterised in that：The technique is by following Step forms：(1) 42CrMo large forgings is air-cooled to 600 DEG C；(2) the 42CrMo large forgings after will be air-cooled is fitted into normalizing in stove, prevents from cracking, crystal grain thinning；(3) the 42CrMo large forgings shove charges after normalizing are waited to expect, it is 300 DEG C to treat material temperature degree, when the supply delay time is 2 small；(4) 700 DEG C are heated to after 42CrMo large forgings temperature is uniform, firing rate is 70 DEG C/h, is then once kept the temperature, When soaking time is 2 small；(5) the 42CrMo large forgings after once keeping the temperature is heated to 830 DEG C, then carries out secondary insulation, soaking time is small for T When, soaking time is calculated with 100mm/h；(6) the 42CrMo large forgings of secondary insulation is subjected to a water cooling, water cooling is to 160 DEG C, then water outlet；(7) by the 42CrMo large forgings after water cooling, when 4 is small, interior shove charge is tempered, and temperature is 550 DEG C, and soaking time is pressed 100mm/1.5h is calculated, and progress secondary water is cold after tempering, and water cooling to room temperature, then water outlet, obtains hardness HRC30, be organized as back The sorbitic 42CrMo large forgings of fire.
- A kind of 3. hardening and tempering process of 42CrMo large forgings according to claim 1, it is characterised in that：The technique is by following Step forms：(1) 42CrMo large forgings is air-cooled to 640 DEG C；(2) the 42CrMo large forgings after will be air-cooled is fitted into normalizing in stove, prevents from cracking, crystal grain thinning；(3) the 42CrMo large forgings shove charges after normalizing are waited to expect, it is 325 DEG C to treat material temperature degree, when the supply delay time is 2.5 small；(4) 730 DEG C are heated to after 42CrMo large forgings temperature is uniform, firing rate is 75 DEG C/h, is then once kept the temperature, When soaking time is 2.5 small；(5) the 42CrMo large forgings after once keeping the temperature is heated to 835 DEG C, then carries out secondary insulation, soaking time is small for T When, soaking time is calculated with 100mm/h；(6) the 42CrMo large forgings of secondary insulation is subjected to a water cooling, water cooling is to 170 DEG C, then water outlet；(7) by the 42CrMo large forgings after water cooling, when 4.5 is small, interior shove charge is tempered, and temperature is 555 DEG C, and soaking time is pressed 100mm/1.5h is calculated, and progress secondary water is cold after tempering, and water cooling to room temperature, then water outlet, obtains hardness HRC32, be organized as back The sorbitic 42CrMo large forgings of fire.
- A kind of 4. hardening and tempering process of 42CrMo large forgings according to claim 1, it is characterised in that：The technique is by following Step forms：(1) 42CrMo large forgings is air-cooled to 675 DEG C；(2) the 42CrMo large forgings after will be air-cooled is fitted into normalizing in stove, prevents from cracking, crystal grain thinning；(3) the 42CrMo large forgings shove charges after normalizing are waited to expect, it is 350 DEG C to treat material temperature degree, when the supply delay time is 3 small；(4) 750 DEG C are heated to after 42CrMo large forgings temperature is uniform, firing rate is 80 DEG C/h, is then once kept the temperature, When soaking time is 3 small；(5) the 42CrMo large forgings after once keeping the temperature is heated to 840 DEG C, then carries out secondary insulation, soaking time is small for T When, soaking time is calculated with 100mm/h；(6) the 42CrMo large forgings of secondary insulation is subjected to a water cooling, water cooling is to 180 DEG C, then water outlet；(7) by the 42CrMo large forgings after water cooling, when 5 is small, interior shove charge is tempered, and temperature is 560 DEG C, and soaking time is pressed 100mm/1.5h is calculated, and progress secondary water is cold after tempering, and water cooling to room temperature, then water outlet, obtains hardness HRC33, be organized as back The sorbitic 42CrMo large forgings of fire.
- A kind of 5. hardening and tempering process of 42CrMo large forgings according to claim 1, it is characterised in that：The technique is by following Step forms：(1) 42CrMo large forgings is air-cooled to 720 DEG C；(2) the 42CrMo large forgings after will be air-cooled is fitted into normalizing in stove, prevents from cracking, crystal grain thinning；(3) the 42CrMo large forgings shove charges after normalizing are waited to expect, it is 370 DEG C to treat material temperature degree, when the supply delay time is 3.5 small；(4) 770 DEG C are heated to after 42CrMo large forgings temperature is uniform, firing rate is 85 DEG C/h, is then once kept the temperature, When soaking time is 3.5 small；(5) the 42CrMo large forgings after once keeping the temperature is heated to 845 DEG C, then carries out secondary insulation, soaking time is small for T When, soaking time is calculated with 100mm/h；(6) the 42CrMo large forgings of secondary insulation is subjected to a water cooling, water cooling is to 190 DEG C, then water outlet；(7) by the 42CrMo large forgings after water cooling, when 5.5 is small, interior shove charge is tempered, and temperature is 565 DEG C, and soaking time is pressed 100mm/1.5h is calculated, and progress secondary water is cold after tempering, and water cooling to room temperature, then water outlet, obtains hardness HRC34, be organized as back The sorbitic 42CrMo large forgings of fire.
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| CN106755863A (en) * | 2016-12-15 | 2017-05-31 | 通裕重工股份有限公司 | Solve the process that heavy in section square forging produces flaw detection coarse-grain |
| CN107511456A (en) * | 2017-08-03 | 2017-12-26 | 六安万邦机械科技有限公司 | A kind of casting technique of evaporative pattern |
| CN107828956A (en) * | 2017-10-17 | 2018-03-23 | 九江学院 | A kind of interactive combination Technology for Heating Processing of diesel vehicle 42CrMo crankshaft forging blanks |
| CN110695279B (en) * | 2019-09-20 | 2021-01-29 | 张家港中环海陆高端装备股份有限公司 | Method for avoiding folding and skin-clamping and harmful tissue during ring forging |
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