CN107058717A - Improve the Technology for Heating Processing that big specification Flat Die Steel forges material spherodized structure - Google Patents
Improve the Technology for Heating Processing that big specification Flat Die Steel forges material spherodized structure Download PDFInfo
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- CN107058717A CN107058717A CN201710036669.XA CN201710036669A CN107058717A CN 107058717 A CN107058717 A CN 107058717A CN 201710036669 A CN201710036669 A CN 201710036669A CN 107058717 A CN107058717 A CN 107058717A
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- normalizing
- temperature
- forging
- soaking time
- cooling
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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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
-
- 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
- C21D1/28—Normalising
-
- 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
Abstract
The present invention discloses the Technology for Heating Processing that a kind of big specification Flat Die Steel of improvement forges material spherodized structure, it is therefore intended that improve forging material nodularization microscopic structure；It is red after design forging to send the process combination annealed and treat that material+ultra fine+isothermal spheroidizing is handled；By after forging it is red send to anneal treat that material can reduce the precipitation of secondary net carbide, be that follow-up ultra fine and isothermal spheroidizing are prepared；During ultra fine, normalizing heating is using 1 preheating, ensure that steel burn thoroughly, internal and external temperature is uniform, normalizing cooling is alternately cooled using water sky, improves intensity of cooling, the coarse grain refinement for producing high temperature forging, elimination net carbide tissue, then pass through the granular carbide that isothermal spheroidizing obtains globular pearlite+a small amount of Dispersed precipitate of fine uniform.Beneficial effects of the present invention are as follows：Using present treatment technique, steel are made to eliminate thick tissue, structural homogenity is improved, and carbide level is improved, and microscopic structure reaches AS1 AS4 levels.
Description
Technical field
It is more particularly to a kind of to improve big specification Flat Die Steel the present invention relates to big specification Flat Die Steel heat treatment after forging field
Forge the Technology for Heating Processing of material spherodized structure, and in particular to 1.2344 Flat Die Steels.
Technical field
It is more particularly to a kind of to improve big specification Flat Die Steel the present invention relates to big specification Flat Die Steel heat treatment after forging field
The Technology for Heating Processing of 1.2344 forging material spherodized structures.
Background technology
1.2344 hot die steels have good heat resistance, red hardness, higher toughness and thermal fatigue resistance and anti-
Hot tearing ability, is mainly used in the fields such as forge die, hot-extrusion mold, die casting.Fushun Special Steel Shares Co., Ltd gives birth to
1.2344 Flat Die Steel nodularization microscopic structures of production are graded between AS8-AS9 according to North America die casting association NADCA#207, are such as schemed
2, Fig. 3；With the development of die industry, large scale mould demand increasingly increases, and mould use environment becomes more and more in addition
Badly, the mold use life-span increasingly causes the attention of user, and existing steel tissue is thick, distribution of carbides is unequal tight
Ghost image rings the mold use life-span.The mode for improving 1.2344 serial hot die steel spherodized structures at present be normalizing after forging+
Isothermal spheroidizing, but be due to that normalizing intensity of cooling is low, the bar or module effect to small dimension size are also possible that to big rule
For lattice forging material, because dimensions is big, using the current type of cooling, center portion easily separates out net carbide, spherodized structure level
It is not poor, Duan Cai tissue odds are caused, the influence later stage uses.
The content of the invention
Improve big specification mould it is an object of the invention to solve above-mentioned problems of the prior art, and there is provided a kind of
Has the Technology for Heating Processing that band steel 1.2344 forges material spherodized structure.
The present invention according to the raising of mould use requirement, design after big specification Flat Die Steel forging it is red send to anneal treat material+ultra-fine
The process combination of change processing+isothermal spheroidizing processing；
It is red after the forging to send annealing furnace temperature to be expected to be not less than 500 DEG C；
The ultra fine is normalizing heating+normalizing cooling；
Normalizing heating is using 1 preheating, and 700 DEG C~800 DEG C of preheating temperature, firing rate is no more than 80 DEG C/h, insulation
Time 1.5min/mm, 980 DEG C~1000 DEG C of normalizing temperature, soaking time 1.5min/mm；Normalizing cooling is alternately cold using water sky
But technology, material temperature is controlled at 300 DEG C~400 DEG C.
The isothermal spheroidizing handles 850 DEG C~1000 DEG C of holding temperature, and firing rate is no more than 80 DEG C/h, insulation
Time 1.5min/mm, is then cooled to 760 DEG C~830 DEG C, soaking time (3~5) min/mm, insulation to be not more than 30 DEG C/h
Afterwards 300 DEG C of air coolings of coming out of the stove are cooled to be not more than 20 DEG C/h with stove.
In the present invention by after forging it is red send to anneal treat that material can reduce the precipitation of secondary net carbide, be follow-up ultra-fine
Change processing and isothermal spheroidizing is prepared；During ultra fine, normalizing heating is using 1 preheating, it is ensured that steel burn thoroughly, inside and outside
Temperature is uniform, and normalizing cooling is alternately cooled using water sky, improves intensity of cooling, the coarse grain refinement for producing high temperature forging,
Elimination net carbide tissue, then pass through globular pearlite+a small amount of Dispersed precipitate of isothermal spheroidizing acquisition fine uniform
Granular carbide.
Beneficial effects of the present invention are as follows：Annealing+ultra fine+isothermal spheroidizing processing work is sent using red after forging
Skill, makes steel eliminate thick tissue, and structural homogenity is improved, and carbide level is improved, and microscopic structure reaches AS1-
AS4 levels, realizing improves the purpose that big specification Flat Die Steel 1.2344 forges material nodularization microscopic structure.
Brief description of the drawings
Fig. 1 is the technological process for the Technology for Heating Processing that the present invention improves the big forging of specification Flat Die Steel 1.2344 material spherodized structure
Figure；
Fig. 2 is microscopic structure AS8 ranks；
Fig. 3 is microscopic structure AS9 ranks；
Fig. 4 is microscopic structure AS1 ranks (head sampling test piece center)；
Fig. 5 is microscopic structure AS3 ranks (head samples radius 1/2)；
Fig. 6 is microscopic structure AS1 ranks (afterbody sampling test piece center)；
Fig. 7 is microscopic structure AS4 ranks (afterbody samples radius 1/2)；
Fig. 8 is microscopic structure AS2 ranks (head sampling test piece center)；
Fig. 9 is microscopic structure AS3 ranks (head samples radius 1/2)；
Figure 10 is microscopic structure AS1 ranks (afterbody sampling test piece center)；
Figure 11 is microscopic structure AS3 ranks (afterbody samples radius 1/2)；
Figure 12 is microscopic structure AS1 ranks (head sampling test piece center)；
Figure 13 is microscopic structure AS2 ranks (head samples radius 1/2)；
Figure 14 is microscopic structure AS1 ranks (afterbody sampling test piece center)；
Figure 15 is microscopic structure AS2 ranks (afterbody samples radius 1/2).
Specific embodiment
The present invention is described in detail.
Big specification Flat Die Steel kind 1.2344, chemical composition：Carbon be 0.37%~0.43%, manganese be 0.3%~
0.5%, silicon is 0.9%~1.2%, and phosphorus is not more than 0.02%, and sulphur is not more than 0.01%, and chromium is 4.8%~5.5%, and molybdenum is
1.2%~1.5%, vanadium is 0.9%~1.1%,
Embodiment 1
Specification：365mm × 900mm,
As shown in figure 1, handling process is as follows：
Step one：It is red after forging to send annealing furnace to wait to expect：Annealing furnace treats 512 DEG C~560 DEG C of material temperature degree；
Step 2：Ultra fine：750 DEG C of preheating temperature, 69 DEG C/h of firing rate, soaking time when normalizing is heated
1.5min/mm, 980 DEG C of normalizing temperature, soaking time 1.5min/mm；Normalizing cooling improves cooling strong using the empty alternative technique of water
Degree, the coarse grain refinement for producing high temperature forging, eliminates net carbide tissue, and material temperature is controlled at 320 DEG C~351 DEG C；
Step 3：Isothermal spheroidizing handling process, 890 DEG C of isothermal spheroidizing holding temperature, heating are used after normalizing
Speed 70 DEG C/h, soaking time 1.5min/mm, are then down to 830 DEG C, soaking time 4min/mm, with 15 after insulation with 16 DEG C/h
DEG C/h is cooled to 300 DEG C of air coolings of coming out of the stove with stove；Through taking piece end to end, microscopic structure is carried out at test piece center and radius 1/2 respectively
Examine, thick tissue is completely eliminated, microscopic structure is the granular carbonization of globular pearlite+a small amount of Dispersed precipitate of fine uniform
Thing, AS1/AS3, AS1/AS4 are rated according to North America die casting association NADCA#207, and such as head samples Fig. 4, Fig. 5, afterbody sampling
Fig. 6, Fig. 7, spherodized structure meet user's use requirement.
Embodiment 2
Specification：420mm × 900mm,
As shown in figure 1, handling process is as follows：
Step one：It is red after forging to send annealing furnace to wait to expect：Annealing furnace treats 520 DEG C~561 DEG C of material temperature degree；
Step 2：Ultra fine：750 DEG C of preheating temperature, 70 DEG C/h of firing rate, soaking time when normalizing is heated
1.5min/mm, 980 DEG C of normalizing temperature, soaking time 1.5min/mm；Normalizing cooling improves cooling strong using the empty alternative technique of water
Degree, the coarse grain refinement for producing high temperature forging, eliminates net carbide tissue, and material temperature is controlled at 320 DEG C~350 DEG C；
Step 3：Isothermal spheroidizing handling process, 890 DEG C of isothermal spheroidizing holding temperature, heating are used after normalizing
Speed 68 DEG C/h, soaking time 1.5min/mm, are then down to 830 DEG C, soaking time 4min/mm, with 15 after insulation with 20 DEG C/h
DEG C/h is cooled to 300 DEG C of air coolings of coming out of the stove with stove；Through taking piece end to end, microscopic structure is carried out at test piece center and radius 1/2 respectively
Examine, thick tissue is completely eliminated, microscopic structure is the granular carbonization of globular pearlite+a small amount of Dispersed precipitate of fine uniform
Thing, AS2/AS3, AS1/AS3 are rated according to North America die casting association NADCA#207, and such as head samples Fig. 8, Fig. 9, afterbody sampling
Figure 10, Figure 11, spherodized structure meet user's use requirement.
Embodiment 3
Specification：360mm × 910mm,
As shown in figure 1, handling process is as follows：
Step one：It is red after forging to send annealing furnace to wait to expect：Annealing furnace treats 515 DEG C~555 DEG C of material temperature degree；
Step 2：Ultra fine：750 DEG C of preheating temperature, 75 DEG C/h of firing rate, soaking time when normalizing is heated
1.5min/mm, 980 DEG C of normalizing temperature, soaking time 1.5min/mm；Normalizing cooling improves cooling strong using the empty alternative technique of water
Degree, the coarse grain refinement for producing high temperature forging, eliminates net carbide tissue, and material temperature is controlled at 310 DEG C~342 DEG C；
Step 3：Isothermal spheroidizing handling process, 890 DEG C of isothermal spheroidizing holding temperature, heating are used after normalizing
Speed 70 DEG C/h, soaking time 1.5min/mm, are then down to 830 DEG C, soaking time 4min/mm, with 15 after insulation with 20 DEG C/h
DEG C/h is cooled to 300 DEG C of air coolings of coming out of the stove with stove；Through taking piece end to end, microscopic structure is carried out at test piece center and radius 1/2 respectively
Examine, thick tissue is completely eliminated, microscopic structure is the granular carbonization of globular pearlite+a small amount of Dispersed precipitate of fine uniform
Thing, is rated AS1/AS2, AS1/AS2, such as head samples Figure 12, Figure 13, and afterbody takes according to North America die casting association NADCA#207
Master drawing 14, Figure 15, spherodized structure meet user's use requirement.
Claims (4)
1. a kind of improve the Technology for Heating Processing that big specification Flat Die Steel forges material spherodized structure, it is characterised in that：The technique includes forging
It is red afterwards to send the process combination annealed and treat that material+ultra fine+isothermal spheroidizing is handled；It is red after the steel forging to send annealing furnace to treat
The temperature of material is not less than 500 DEG C；The ultra fine is normalizing heating+normalizing cooling, and normalizing heating is preheated using 1 time, in advance
Hot 700 DEG C~800 DEG C of temperature, firing rate be no more than 80 DEG C/h, soaking time 1.5min/mm, 980 DEG C of normalizing temperature~
1000 DEG C, soaking time 1.5min/mm；Normalizing cooling is alternately cooled technology using water sky, and material temperature is controlled at 300 DEG C~400 DEG C；
The isothermal spheroidizing processing, 850 DEG C~1000 DEG C of holding temperature, firing rate is no more than 80 DEG C/h, soaking time
1.5min/mm, is then cooled to 760 DEG C~830 DEG C to be not more than 30 DEG C/h, soaking time (3~5) min/mm, after insulation with
No more than 20 DEG C/h is cooled to 300 DEG C of air coolings of coming out of the stove with stove.
2. improve the Technology for Heating Processing that big specification Flat Die Steel forges material spherodized structure according to claim 1, it is characterised in that：
It is red after the forging to send annealing furnace to wait to expect：Annealing furnace treats 512 DEG C~560 DEG C of material temperature degree；
The ultra fine：750 DEG C of preheating temperature when normalizing is heated, firing rate 69 DEG C/h, soaking time 1.5min/mm,
980 DEG C of normalizing temperature, soaking time 1.5min/mm；Normalizing cooling is improved intensity of cooling, is made high temperature using the empty alternative technique of water
The coarse grain refinement that forging is produced, eliminates net carbide tissue, and material temperature is controlled at 320 DEG C~351 DEG C；
The isothermal spheroidizing handling process, 890 DEG C of isothermal spheroidizing holding temperature, 70 DEG C/h of firing rate, during insulation
Between 1.5min/mm, be then down to 830 DEG C with 16 DEG C/h, soaking time 4min/mm is cooled to 300 with 15 DEG C/h after insulation with stove
DEG C come out of the stove air cooling.
3. improve the Technology for Heating Processing that big specification Flat Die Steel forges material spherodized structure according to claim 1, it is characterised in that：
It is red after the forging to send annealing furnace to wait to expect：Annealing furnace treats 520 DEG C~561 DEG C of material temperature degree；
The ultra fine：750 DEG C of preheating temperature when normalizing is heated, firing rate 70 DEG C/h, soaking time 1.5min/mm,
980 DEG C of normalizing temperature, soaking time 1.5min/mm；Normalizing cooling is improved intensity of cooling, is made high temperature using the empty alternative technique of water
The coarse grain refinement that forging is produced, eliminates net carbide tissue, and material temperature is controlled at 320 DEG C~350 DEG C；
The isothermal spheroidizing handling process, 890 DEG C of isothermal spheroidizing holding temperature, 68 DEG C/h of firing rate, during insulation
Between 1.5min/mm, be then down to 830 DEG C with 20 DEG C/h, soaking time 4min/mm is cooled to 300 with 15 DEG C/h after insulation with stove
DEG C come out of the stove air cooling.
4. improve the Technology for Heating Processing that big specification Flat Die Steel forges material spherodized structure according to claim 1, it is characterised in that：
It is red after the forging to send annealing furnace to wait to expect：Annealing furnace treats 515 DEG C~555 DEG C of material temperature degree；
The ultra fine：750 DEG C of preheating temperature when normalizing is heated, firing rate 75 DEG C/h, soaking time 1.5min/mm,
980 DEG C of normalizing temperature, soaking time 1.5min/mm；Normalizing cooling is improved intensity of cooling, is made high temperature using the empty alternative technique of water
The coarse grain refinement that forging is produced, eliminates net carbide tissue, and material temperature is controlled at 310 DEG C~342 DEG C；
The isothermal spheroidizing handling process, 890 DEG C of isothermal spheroidizing holding temperature, 70 DEG C/h of firing rate, during insulation
Between 1.5min/mm, be then down to 830 DEG C with 20 DEG C/h, soaking time 4min/mm is cooled to 300 with 15 DEG C/h after insulation with stove
DEG C come out of the stove air cooling.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108220562A (en) * | 2018-01-08 | 2018-06-29 | 东南大学 | A kind of mould steel phase transformation heat treatment method |
| CN108611469A (en) * | 2018-07-11 | 2018-10-02 | 石钢京诚装备技术有限公司 | A kind of heat treatment method of support roll |
| CN109957702A (en) * | 2019-02-26 | 2019-07-02 | 唐山志威科技有限公司 | The preparation method of high rigidity, high tenacity development machine cutter ring steel ZW552 |
| CN113881831A (en) * | 2021-10-08 | 2022-01-04 | 内蒙古北方重工业集团有限公司 | Post-forging heat treatment method for Cr-Mo-V type medium-carbon medium alloy steel |
| CN114134412A (en) * | 2021-11-08 | 2022-03-04 | 内蒙古北方重工业集团有限公司 | Hot work die steel and method for refining uniform grain structure thereof |
| CN115927801A (en) * | 2022-12-09 | 2023-04-07 | 铜陵有色金神耐磨材料有限责任公司 | Heat treatment process for refining ferrous metal grains |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108220562A (en) * | 2018-01-08 | 2018-06-29 | 东南大学 | A kind of mould steel phase transformation heat treatment method |
| CN108611469A (en) * | 2018-07-11 | 2018-10-02 | 石钢京诚装备技术有限公司 | A kind of heat treatment method of support roll |
| CN109957702A (en) * | 2019-02-26 | 2019-07-02 | 唐山志威科技有限公司 | The preparation method of high rigidity, high tenacity development machine cutter ring steel ZW552 |
| CN113881831A (en) * | 2021-10-08 | 2022-01-04 | 内蒙古北方重工业集团有限公司 | Post-forging heat treatment method for Cr-Mo-V type medium-carbon medium alloy steel |
| CN114134412A (en) * | 2021-11-08 | 2022-03-04 | 内蒙古北方重工业集团有限公司 | Hot work die steel and method for refining uniform grain structure thereof |
| CN115927801A (en) * | 2022-12-09 | 2023-04-07 | 铜陵有色金神耐磨材料有限责任公司 | Heat treatment process for refining ferrous metal grains |
| CN115927801B (en) * | 2022-12-09 | 2023-10-03 | 铜陵有色金神耐磨材料有限责任公司 | Heat treatment process for refining ferrous metal grains |
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