CN101696466B - Three-stage temperature annealing process for 30CrMnSiA cold rolled steel part - Google Patents
Three-stage temperature annealing process for 30CrMnSiA cold rolled steel part Download PDFInfo
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- CN101696466B CN101696466B CN2009101913143A CN200910191314A CN101696466B CN 101696466 B CN101696466 B CN 101696466B CN 2009101913143 A CN2009101913143 A CN 2009101913143A CN 200910191314 A CN200910191314 A CN 200910191314A CN 101696466 B CN101696466 B CN 101696466B
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Abstract
The invention relates to a three-stage temperature annealing process for a 30CrMnSiA cold rolled steel part, which is realized at three different temperature stages, i.e. ferrite and cementite diffuse at the first-stage temperature of 650 DEG C, austenite nucleates and grows up at the second-stage temperature of 800-810 DEG C, and the austenite is converted into the ferrite and a carbide which is further relocated and diffused to form a spherical carbide at the third-stage temperature of 660-670 DEG C; and the aim of improving the deformation of a 30CrMnSiA cold rolled steel plate is achieved by the three-stage temperature. For the same material and rolled steel in the same furnace, compared with the traditional annealing process, the annealing process can further improve the plastic deformation and the elongation percentage of the 30CrMnSiA cold rolled steel plate during punching and can reduce the punching cracks of the steel plate.
Description
Technical field:
The present invention relates to heat treatment technics, being specifically related to material is the heat-treatment of annealing technology of the part of 30CrMnSiA structural low cold rolled plate material, on the same stove steel with a kind of material, this technology can significantly improve viscous deformation, the extensibility of cold-rolled steel sheet, reduces the stamping cracking of steel plate.
Background technology:
Existing heat-treatment of annealing technology is divided into: diffusion annealing (temperature Ac3+150 ℃～200 ℃), Full Annealing (temperature Ac3+30 ℃～50 ℃), underannealing (temperature Ac1+40 ℃～60 ℃), isothermal annealing (Ac3+30 ℃～50 ℃ of hypoeutectoid steel temperature; Ac1+20 ℃～40 ℃ of eutectoid steel and hypereutectoid steel temperature), Spheroidizing Annealing (temperature Ac1+20 ℃～40 ℃ or Accm+20 ℃～30 ℃), recrystallization annealing or process annealing (temperature Ac1-50 ℃～150 ℃), stress relief annealing (temperature Ac1-100 ℃～200 ℃).For the conventional annealing technology of 30CrMnSiA cold-rolled steel part also nothing more than above several.When cold-rolled steel sheet 30CrMnSiA is required to strike out form comparatively during complicated parts, above described several annealing processs just can not meet the demands, the local rimose phenomenon of punching press often appears in cold-rolled steel sheet, badly influences the surface quality of punching parts, even causes scrapping of punching parts.
Summary of the invention:
For plasticity, the extensibility that improves 30CrMnSiA cold-rolled steel part, the cracking phenomena that produces during the impact briquetting of minimizing steel plate the invention provides a kind of three temperature section annealing processs at 30CrMnSiA cold-rolled steel part.
It is as follows that the present invention solves technical scheme that its technical problem adopts:
A kind of three temperature section annealing processs of 30CrMnSiA cold-rolled steel part; neatly overlay the 30CrMnSiA cold-rolled steel sheet in the container; container is packed in the heat-treatment of annealing equipment (as vacuum annealing furnace together with steel plate; nitrogen protection pit furnace etc.); be warming up to 350 ℃, be incubated 1 hour to 2 hours, 650 ℃ of insulations 1 hour heat up; be warming up to 800 ℃-810 ℃ again, be incubated 2 hours to 3 hours.Stove is as cold as 660 ℃-670 ℃ then, is incubated 8 hours to 10 hours, and last stove is chilled to below 450 ℃, and the steel plate air cooling of coming out of the stove is finished the first step of steel plate annealing.
If the stamping forming final part of 30CrMnSiA cold-rolled steel is very complicated, then increase annealed second step at different completed states, to eliminate cumulative machining stress in the stamping procedure according to work in-process.
Steel plate sent into obtain work in-process after stamping procedure strikes out definite shape; work in-process carry out the annealing of second step again: work in-process neatly overlay in the container; container is packed into together with work in-process in the heat-treatment of annealing equipment, and (as vacuum annealing furnace, nitrogen protection pit furnace etc.) are warming up to 350 ℃; be incubated 1 hour to 2 hours; heat up 650 ℃ to 680 ℃ again, be incubated 8 hours to 10 hours, after soaking time finishes; below the work in-process furnace cooling to 450 ℃, the air cooling of coming out of the stove.
This process using three temperature sections annealing, fs temperature (650 ℃), ferrite and cementite diffusion, subordinate phase temperature (800 ℃-810 ℃), the austenite forming core is also grown up, the phase III temperature (660 ℃--670 ℃), austenitic transformation is ferrite and carbide, and the further diffusion mobility of carbide forms globular carbide, through above-mentioned three temperature sections, reach the purpose that improves the distortion of 30CrMnSiA cold-rolled steel sheet.
The invention has the beneficial effects as follows: the impact briquetting that can greatly improve the 30CrMnSiA cold-rolled steel sheet by this technology, increase the extensibility and the plasticity of material, the steelwork of impact briquetting complexity is not produced the punching press crackle.
Description of drawings:
The heat treatment cycle curve figure of this technology of Fig. 1;
Fig. 2 is isothermal annealing process curve figure
Fig. 3 heats up 350 ℃ through this technology, is incubated 1 hour, is warmed up to 650 ℃ of insulations 1 hour again, heat up 800 ℃ again, be incubated 2 hours, cold 660 ℃ of stove, be incubated 8 hours, the anneal part metallograph of the cold air cooling of coming out of the stove below 450 ℃ of stove (500 times, the corrosion of 5% nitric acid alcohol)
Embodiment:
Embodiment 1:
Part name: big case base, material: 30CrMnSiA, starting material state: cold-rolled steel sheet.Part is shaped to final part shape by the starting material cold-rolled steel sheet after through three road stamping procedures, and its technical requirements is: the baseplane≤0.30mm of part, top surface plane degree≤0.30mm.Inner chamber height dimension 27.2mm, upper variation of tolerance 0.28mm, lower variation of tolerance 0mm.Inner chamber width dimensions 95.5mm, upper variation of tolerance 0.87mm, lower variation of tolerance 0mm, part length 630mm, part thickness 6mm.
Sheet stock (the starting material length 630mm that will cut through blanking shears at first; width 204mm; thickness 6mm) packs in the container; container is put into rough vacuum well formula gas shield resistance furnace; well formula resistance furnace begins to be evacuated to 0.1Mpa, stops to vacuumize, and feeds nitrogen (purity is more than 99.95%); electric furnace begins heating, carries out annealing process by process curve shown in Figure 1.Be warming up to 350 ℃, be incubated 60 minutes; Be warming up to 650 ℃ again, be incubated 60 minutes; Be warming up to 800 ℃ again, be incubated 3 hours; Stove is chilled to 680 ℃, is incubated 8 hours; Stove is chilled to 250 ℃ subsequently, the steel plate air cooling of coming out of the stove.In whole temperature-rise period, pit furnace feeds nitrogen protection always, and is oxidized to avoid surface of steel plate.Steel plate is sent into punch press and is carried out bending ram after annealing for the first time, becomes the half storey product, work in-process length 630mm, and the wide 95.5mm in bottom surface, the both sides angle is 135 ℃, work in-process thickness 6mm.Again the work in-process behind the bending are carried out the annealing second time, with work in-process longitudinally vertical pendulum be placed in the container, container is put into rough vacuum well formula gas shield resistance furnace, pit furnace begins to be evacuated to 0.1Mpa, stop to vacuumize, feed nitrogen (purity is more than 99.95%), electric furnace begins heating, carry out the annealing of part by isothermal annealing technology shown in Figure 2, be warming up to 350 ℃ of insulations 60 minutes; Heat up again 680 ℃ and be incubated 8 hours; Stove is chilled to 250 ℃ subsequently, the work in-process air cooling of coming out of the stove.Take out work in-process from well formula resistance furnace after, work in-process are carried out punching press once more, punching press is curved, work in-process length 630mm, and the wide 95.5mm in bottom surface, the both sides angle is 90 ℃, the excessive arc radius of angle is R5.5, flanging height dimension 27.2mm, work in-process thickness 6mm.The work in-process after curved are annealed for the third time by isothermal annealing technology shown in Figure 2, punching press is curved once more again, reaches the requirement of finished part figure at last, the baseplane≤0.30mm of part, top surface plane degree≤0.30mm.Inner chamber height dimension 27.2mm, upper variation of tolerance 0.28mm, lower variation of tolerance 0mm.Inner chamber width dimensions 95.5mm, upper variation of tolerance 0.87mm, lower variation of tolerance 0mm, part length 630mm, part thickness 6mm.After above operation processing, big case base overall dimensions are qualified, and its metallographic structure is shown in Figure 3.
Claims (1)
1.30CrMnSiA three temperature section annealing processs of cold-rolled steel part, described technological process is as follows:
(1) neatly overlay the 30CrMnSiA cold-rolled steel sheet in the container, container is packed in the heat-treatment of annealing equipment, be warming up to 350 ℃, be incubated 1 hour to 2 hours, be warming up to 650 ℃ of insulations 1 hour, be warming up to 800 ℃-810 ℃ again, be incubated 2 hours to 3 hours, stove is as cold as 660 ℃-670 ℃ then, be incubated 8 hours to 10 hours, last stove is chilled to below 450 ℃, and the steel plate air cooling of coming out of the stove is finished the first step annealing of steel plate;
(2) after finishing steel plate annealing, steel plate sent into the stamping procedure punching press after, obtain work in-process, again work in-process are carried out the annealing of second step: neatly overlay work in-process in the container, container is packed in the heat-treatment of annealing equipment, is warming up to 350 ℃, is incubated 1 hour to 2 hours, heat up 650 ℃ to 680 ℃ again, be incubated 8 hours to 10 hours, after soaking time finishes, below the work in-process furnace cooling to 450 ℃, the air cooling of coming out of the stove obtains part.
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| CN102672433B (en) * | 2012-05-20 | 2014-06-11 | 西安航天动力机械厂 | Manufacture method of cone annular spherical steel workpieces |
| CN108220548B (en) * | 2016-08-29 | 2019-10-15 | 涿州市飞亚机械有限责任公司 | A kind of processing technology of high-strength steel strip |
| CN108300846B (en) * | 2018-03-05 | 2020-06-09 | 苏州特鑫精密电子有限公司 | Annealing process for high-strength hardware bolt |
| CN110735021B (en) * | 2019-11-08 | 2021-09-14 | 沈阳航天新光集团有限公司 | Quenching process method for high-pressure welded gas cylinder material |
| CN110900131A (en) * | 2019-12-09 | 2020-03-24 | 中国科学院上海应用物理研究所 | Method for processing molten salt corrosion resistant nickel-molybdenum-chromium alloy based on carbide structure modification |
| CN111519091A (en) * | 2020-04-27 | 2020-08-11 | 浙江丰原型钢科技有限公司 | Processing technology of high-strength deformed steel |
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| CN101265514A (en) * | 2008-05-14 | 2008-09-17 | 江南机器（集团）有限公司 | Composite heat treatment method for 30CrMnSiA steel thin wall spinning cylinder-shape element |
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| CN101265514A (en) * | 2008-05-14 | 2008-09-17 | 江南机器（集团）有限公司 | Composite heat treatment method for 30CrMnSiA steel thin wall spinning cylinder-shape element |
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