CN103866333A - Nitrocarburizing process of Cr12MoV steel - Google Patents
Nitrocarburizing process of Cr12MoV steel Download PDFInfo
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- CN103866333A CN103866333A CN201410078950.6A CN201410078950A CN103866333A CN 103866333 A CN103866333 A CN 103866333A CN 201410078950 A CN201410078950 A CN 201410078950A CN 103866333 A CN103866333 A CN 103866333A
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Abstract
The invention relates to a nitrocarburizing process of Cr12MoV steel. The nitrocarburizing process comprises the following steps: carrying out high-temperature quenching on a mold of the Cr12MoV steel, putting the mold into a box, putting the box into an electric furnace, carrying out nitrocarburizing, maintaining the temperature for 4-8 hours, and adding a small amount of catalyst, namely chromium trioxide to carry out catalysis nitriding, wherein the process temperature of the nitrocarburizing is 560-580 DEG C, nitriding agents are charcoal and urea, and the proportion of the charcoal to the urea is 3:2; and putting the mold into the electric furnace at 200 DEG C, tempering for 2 hours while maintaining the temperature, discharging the mold out of the electric furnace, adding the mold into cold oil, and taking out the mold after the mold is cooled to the room temperature. According to the nitrocarburizing process, the service life of the mold of the Cr12MoV steel is effectively prolonged.
Description
Technical field
The invention belongs to steel material surface processing technology field, a kind of simple, efficient, low cost Cr12MoV steel nitrogen-carbon cocementing process is particularly provided.
Technical background
Cr12MoV steel is a kind of conventional cold die steel that does, and has good obdurability, wear resistance and compared with high-hardenability, is applicable to make various cold deformation processing molds, has been widely used at present the industry such as automobile industry, powder metallurgy processing.China Patent Publication No. CN101392361A discloses a kind of Martensite Stainless Steel carbonitriding method, but the shortcoming such as it is undesirable also to exist desired result, and the life-span is short; For Cr12MoV steel die, its main failure forms is wearing and tearing, and metallic substance is in separation, moulding, flow process, and die surface exists strong friction, thereby makes surface quality variation, and even die size precision reduces.Therefore, the shortcoming such as Cr12MoV punching block ubiquity is short work-ing life, and part to be processed precision fluctuation is large, although can be through reconditioning, proper extension die life, production cost is still higher, and the performance of enterprises is declined.
At present, the effective ways that improve Cr12MoV steel die work-ing life are that it is carried out to surface chemistry thermal treatment, and ordinary method comprises nitriding, carburizing, carbonitriding etc.But in existing Cr12MoV steel chemical heat treatment process, all need professional specific installation, complex process, ordinary enterprises, particularly small business do not possess treatment condition.Therefore, develop a kind of Cr12MoV steel chemical heat treatment process simple, efficient, with low cost, that do not need specific installation and there is certain practical significance, particularly, to middle and small scale enterprise, it is reduced costs, improve Cr12MoV steel die quality product significant.
Summary of the invention
The object of the invention is to provide the nitrogen-carbon cocementing process of a kind of low cost, efficient Cr12MoV steel, in the work-ing life of effectively improving all kinds Cr12MoV steel die product, increases enterprise's productivity effect.
The nitrogen-carbon cocementing process of Cr12MoV steel, step 1, carries out quench hot by Cr12MoV steel die, 850 DEG C ± 5 DEG C of temperature, insulation 0.5h; 1150 DEG C ± 5 DEG C of oil quenching temperature, insulation 0.1h; Step 2, mould vanning, at the bottom of case, paving one deck penetration enhancer, then packs mould in case successively, between mould and tank wall, has penetration enhancer, between mould and mould, has penetration enhancer to be separated by; Step 3, case is packed in electric furnace and carries out carbonitriding, nitrogen-carbon cocementing process temperature, between 560 DEG C-580 DEG C, is incubated 4-8 hours; Wherein, described penetration enhancer is charcoal and urea, and its ratio is 3:2, also adds a little catalyzer chromium trioxide to urge and oozes; Step 4, mould is put into the electric furnace of 200 DEG C be incubated the tempering of 2 hours, then come out of the stove that it is cooling in cold oil to quench, take out after being chilled to room temperature.
As further preferred, when carbonitriding, the particle diameter maximum of penetration enhancer charcoal is no more than 5 ㎜.
As further preferred, described chromium trioxide is the 1-3% of penetration enhancer gross weight.
As further preferably, before the mould vanning of step 2, carry out surface removal oil stain and rust cleaning, and machining surface processing extra coarse degree should exceed 1.6 μ m.
As further preferably, at the bottom of case between the thickness of penetration enhancer, mould and tank wall between penetration enhancer thickness and mould and mould penetration enhancer thickness all more than 10mm; Penetration enhancer thickness on the superiors' mould is more than 20mm.
As further preferably, between the lid of described case and casing, seal with wet fireclay.
This processing method has the following advantages:
(1) based on the conventional preparation flow of Cr12MoV steel die, improve the tempering phase temperature after quenching, carry out carbonitriding, additionally do not increase work flow, technique is simple.
(2) adopt conventional market solid carburizer on sale and urea as diffusion medium, add a little chromium trioxide simultaneously and urge and oozing, with low cost.
(3) after this art breading, Cr12MoV steel die alloying layer thickness reaches 0.1-0.2mm, and surface hardness improves 400-500HV, extends work-ing life more than 2 times.
Brief description of the drawings
Fig. 1 heat treatment cycle curve of the present invention.
Hardness curve before and after Fig. 2 Cr12MoV steel carbonitriding.
Abrasion loss before and after Fig. 3 Cr12MoV steel carbonitriding.
Embodiment
Referring to the thermal treatment flow process of Fig. 1, concrete technology step of the present invention is as follows:
(1) configuration penetration enhancer.Select dry fine-grannular solid carburizer, the urea of granularity 3-5mm and chemical analysis purity is as nitrocarburizing medium, and the two ratio is 3:2, and above-mentioned bi-material is evenly mixed.Add the chromium trioxide that accounts for penetration enhancer gross weight 1-3% simultaneously, urge and oozing.Preferred as one, when carbonitriding, the particle diameter maximum of penetration enhancer charcoal is no more than 5 ㎜.
(2) mould pre-treatment.First Cr12MoV steel die is carried out to high temperature protection heating quenching, oil quenching technique is 1150 DEG C.Preferred as one, after quenching, mould must conscientiously carry out surface removal oil stain and rust cleaning before vanning, and machining surface processing extra coarse degree should exceed 1.6 μ m.
(3) mould vanning.How much ooze case should design according to workpiece size and vanning amount, and material selection thickness is not less than the stainless steel plate of 4 mm, and two-sided being welded requires to have lid sealing, and the gap between lid and casing is less than 2 mm.When vanning, first paving one deck penetration enhancer (being greater than 10 mm) at the bottom of case, then packs mould in case successively.Penetration enhancer thickness between mould and tank wall and between mould and mould is not less than 10 mm, between two-layer mould, there is penetration enhancer to be separated by, on the superiors' mould, cover the penetration enhancer of the above thickness of 20 mm, then will after the penetration enhancer jolt ramming in FCL, add a cover, wet fireclay sealing for gap between lid and casing.
(4) carbonitriding.Pack in the electric furnace that is heated to 560 DEG C-580 DEG C oozing case, at this temperature, vary in size depending on oozing case, be incubated 4-8 hours, then will ooze outside case pull-out stove, after uncapping, take out successively mould and carry out immediately oil quenchinng, in the time that die temperature reaches 200 DEG C of left and right, fuel-displaced air cooling is to room temperature.
(5) low-temperaturetempering.The mould that oozes rear quenching is put in time and has been warming up to the electric furnace of 200 DEG C and is incubated the tempering of 2 hours, and then coming out of the stove, it is cooling in cold oil to quench.After being chilled to room temperature, take out.
3 Cr12MoV steel die are carried out to quench hot, adopt secondary heating, 850 DEG C ± 5 DEG C, insulation 0.5h; 1150 DEG C ± 5 DEG C of oil quenchings, insulation 0.1h.Getting 1800g solid carburizer, 1200g urea and 40g chromium trioxide evenly mixes.Then paving one deck penetration enhancer at the bottom of case, then die surface is removed to oil stain and rust, pack into successively in case.Penetration enhancer thickness between mould and tank wall and between mould and mould is not less than 10 mm, and the superiors cover the penetration enhancer of the above thickness of 20 mm, then will after the penetration enhancer jolt ramming in FCL, add a cover wet fireclay sealing for gap between lid and casing.Then pack in the electric furnace that is heated to 570 DEG C oozing case, be incubated 8 hours, to soaking time then, will ooze outside case pull-out stove, uncap, take out successively mould and carry out immediately oil quenchinng, in the time that die temperature reaches 200 DEG C of left and right, fuel-displaced air cooling is to room temperature.Finally the mould that oozes rear quenching is put into and be warming up to the electric furnace of 200 DEG C and be incubated the tempering of 2 hours, then come out of the stove that it is cooling in cold oil to quench, take out after being chilled to grease chamber's temperature.
Alloying layer thickness, surface hardness, abrasion loss before and after table 1 Cr12MoV carbonitriding
| Cr12MoV sample | Alloying layer thickness (um) | Surface hardness (HV) | Abrasion loss (g) |
| Untreated samples | 0 | 690 | 0.016 |
| Carbonitriding Sample A | 0.18 | 1118 | 0.085 |
| Carbonitriding sample B | 0.18 | 1100 | 0.009 |
| Carbonitriding sample C | 0.21 | 1150 | 0.076 |
3 stepped Cr12MoV steel die are carried out to quench hot, adopt secondary heating, 850 DEG C ± 5 DEG C, insulation 0.5h; 1150 DEG C ± 5 DEG C of oil quenchings, insulation 0.2h.Getting 3000g solid carburizer, 2000g urea and 120g chromium trioxide evenly mixes.Then paving one deck penetration enhancer at the bottom of case, then die surface is removed to oil stain and rust, pack into successively in case.Penetration enhancer thickness between mould and tank wall and between mould and mould is not less than 10 mm, and the superiors cover the penetration enhancer of the above thickness of 20 mm, then will after the penetration enhancer jolt ramming in FCL, add a cover wet fireclay sealing for gap between lid and casing.Then pack in the electric furnace that is heated to 580 DEG C oozing case, be incubated 7 hours, to soaking time then, will ooze outside case pull-out stove, uncap, take out successively mould and carry out immediately oil quenchinng, in the time that die temperature reaches 200 DEG C of left and right, fuel-displaced air cooling is to room temperature.Finally the mould that oozes rear quenching is put into and be warming up to the electric furnace of 200 DEG C and be incubated the tempering of 2 hours, then come out of the stove that it is cooling in cold oil to quench, take out after being chilled to grease chamber's temperature.
After processing finishes, test alloying layer thickness, hardness and abrasion loss, result is as shown in table 1.
Alloying layer thickness, surface hardness, abrasion loss before and after table 2 Cr12MoV carbonitriding
| Cr12MoV sample | Alloying layer thickness (um) | Surface hardness (HV) | Abrasion loss (g) |
| Untreated samples | 0 | 690 | 0.016 |
| Carbonitriding Sample A | 0.18 | 1120 | 0.008 |
| Carbonitriding sample B | 0.18 | 1050 | 0.009 |
| Carbonitriding sample C | 0.21 | 1155 | 0.007 |
Fig. 2 is average carbonitriding and the broken line comparison diagrams of carbonitriding not drawn of multiple coupon results.Fig. 3 is the carbonitriding average abrasion amount of multiple samples and the comparison diagram of carbonitriding not.The present invention is based on the conventional preparation flow of Cr12MoV steel die, adopt solid process, successfully realized the carbonitriding of Cr12MoV steel die, the work-ing life of effectively having improved Cr12MoV steel die.
The above-mentioned description to embodiment is can understand and apply the invention for ease of those skilled in the art.Person skilled in the art obviously can easily make various amendments to these embodiment, and General Principle described herein is applied in other embodiment and needn't passes through performing creative labour.Therefore, the invention is not restricted to the embodiment here, those skilled in the art are according to announcement of the present invention, and not departing from improvement and the amendment that category of the present invention makes all should be within protection scope of the present invention.
Claims (6)
- The nitrogen-carbon cocementing process of 1.Cr12MoV steel, is characterized in that, step 1, Cr12MoV steel die is carried out to quench hot, 850 DEG C ± 5 DEG C of temperature, insulation 0.5h; 1150 DEG C ± 5 DEG C of oil quenching temperature, insulation 0.1h; Step 2, mould vanning, at the bottom of case, paving one deck penetration enhancer, then packs mould in case successively, between mould and tank wall, has penetration enhancer, between mould and mould, has penetration enhancer to be separated by; Step 3, case is packed in electric furnace and carries out carbonitriding, nitrogen-carbon cocementing process temperature, between 560 DEG C-580 DEG C, is incubated 4-8 hours; Wherein, described penetration enhancer is charcoal and urea, and its ratio is 3:2, also adds a little catalyzer chromium trioxide to urge and oozes; Step 4, mould is put into the electric furnace of 200 DEG C be incubated the tempering of 2 hours, then come out of the stove that it is cooling in cold oil to quench, take out after being chilled to room temperature.
- 2. the nitrogen-carbon cocementing process of Cr12MoV steel according to claim 1, is characterized in that: when carbonitriding, the particle diameter maximum of penetration enhancer charcoal is no more than 5 ㎜.
- 3. the nitrogen-carbon cocementing process of Cr12MoV steel according to claim 2, is characterized in that: described chromium trioxide is the 1-3% of penetration enhancer gross weight.
- 4. the nitrogen-carbon cocementing process of Cr12MoV steel according to claim 1, is characterized in that: before the mould vanning of step 2, carry out surface removal oil stain and rust cleaning, and machining surface processing extra coarse degree should exceed 1.6 μ m.
- 5. according to the nitrogen-carbon cocementing process of the Cr12MoV steel described in claim 1 or 3, it is characterized in that: at the bottom of case between the thickness of penetration enhancer, mould and tank wall between penetration enhancer thickness and mould and mould penetration enhancer thickness all more than 10mm; Penetration enhancer thickness on the superiors' mould is more than 20mm.
- 6. the nitrogen-carbon cocementing process of Cr12MoV steel according to claim 5, is characterized in that: between the lid of described case and casing, seal with wet fireclay.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110293658A (en) * | 2019-07-04 | 2019-10-01 | 南京安立特电子科技有限公司 | A kind of combination running channel formula multi-cavity mold and its process and material |
| CN110565048A (en) * | 2019-10-12 | 2019-12-13 | 锦州捷通铁路机械股份有限公司 | Heat treatment process for improving hot hardness and high-temperature wear resistance of hot die steel |
| CN111979380A (en) * | 2020-08-10 | 2020-11-24 | 大冶龙宇模具有限公司 | Metal die heat treatment processing technology |
| CN112090973A (en) * | 2020-09-08 | 2020-12-18 | 锦州捷通铁路机械股份有限公司 | Process for manufacturing high-performance seamless steel tube cold-drawing die by using low-carbon low-alloy steel |
| CN114481011A (en) * | 2021-12-31 | 2022-05-13 | 锦州捷通铁路机械股份有限公司 | Solid nitriding process for surface strengthening of hot die steel with low deformation |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009074110A (en) * | 2007-09-18 | 2009-04-09 | Kobe Steel Ltd | Gear part excellent in fitness |
| CN103290354A (en) * | 2012-02-24 | 2013-09-11 | 上海汇众汽车制造有限公司 | Nitrocarburizing optimizing process of Cr12MoV steel |
| CN103382543A (en) * | 2013-07-26 | 2013-11-06 | 太原钢铁(集团)有限公司 | Special rare earth boron, carbon and nitrogen multicomponent diffusion medium for die steel and preparation method thereof |
-
2014
- 2014-03-05 CN CN201410078950.6A patent/CN103866333B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009074110A (en) * | 2007-09-18 | 2009-04-09 | Kobe Steel Ltd | Gear part excellent in fitness |
| CN103290354A (en) * | 2012-02-24 | 2013-09-11 | 上海汇众汽车制造有限公司 | Nitrocarburizing optimizing process of Cr12MoV steel |
| CN103382543A (en) * | 2013-07-26 | 2013-11-06 | 太原钢铁(集团)有限公司 | Special rare earth boron, carbon and nitrogen multicomponent diffusion medium for die steel and preparation method thereof |
Non-Patent Citations (1)
| Title |
|---|
| 王振宁，等: "Cr12MoV钢镀钛催渗氮碳共渗工艺研究", 《模具工艺》, vol. 34, no. 1, 31 December 2008 (2008-12-31), pages 74 - 76 * |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110293658A (en) * | 2019-07-04 | 2019-10-01 | 南京安立特电子科技有限公司 | A kind of combination running channel formula multi-cavity mold and its process and material |
| CN110565048A (en) * | 2019-10-12 | 2019-12-13 | 锦州捷通铁路机械股份有限公司 | Heat treatment process for improving hot hardness and high-temperature wear resistance of hot die steel |
| CN110565048B (en) * | 2019-10-12 | 2021-07-06 | 锦州捷通铁路机械股份有限公司 | Heat treatment process for improving hot hardness and high-temperature wear resistance of hot die steel |
| CN111979380A (en) * | 2020-08-10 | 2020-11-24 | 大冶龙宇模具有限公司 | Metal die heat treatment processing technology |
| CN112090973A (en) * | 2020-09-08 | 2020-12-18 | 锦州捷通铁路机械股份有限公司 | Process for manufacturing high-performance seamless steel tube cold-drawing die by using low-carbon low-alloy steel |
| CN112090973B (en) * | 2020-09-08 | 2022-03-15 | 锦州捷通铁路机械股份有限公司 | Process for manufacturing high-performance seamless steel tube cold-drawing die by using low-carbon low-alloy steel |
| CN114481011A (en) * | 2021-12-31 | 2022-05-13 | 锦州捷通铁路机械股份有限公司 | Solid nitriding process for surface strengthening of hot die steel with low deformation |
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