CN103045831A - Method for improving cold-work die steel hardness - Google Patents
Method for improving cold-work die steel hardness Download PDFInfo
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- CN103045831A CN103045831A CN2012105139064A CN201210513906A CN103045831A CN 103045831 A CN103045831 A CN 103045831A CN 2012105139064 A CN2012105139064 A CN 2012105139064A CN 201210513906 A CN201210513906 A CN 201210513906A CN 103045831 A CN103045831 A CN 103045831A
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Abstract
A method for improving the cold-work die steel hardness mainly comprises the steps that a cold-work die steel is subjected to pressure treatment at first, the pressure is between 2-4 GPa, the heating temperature is between 820 and 850 DEG C, the thermal insulating time is between 20 and 30 minutes, power is cut off, the pressure is maintained to naturally cool to the room temperature, and the circulating water flow rate of a cooling pressure head is between 0.6 and 1.2 liters/minute; a cold-work die steel sample after high pressure treatment is soaked in liquid nitrogen of minus 196 DEG C and is remained for 120-180 minutes; and the cold-work die steel after the subzero treatment is tempered, the heating temperature is between 150 and 200 DEG C, the thermal insulation time is between 60-120 minutes, and the cold-work die steel is discharged from a furnace to be air cooled to the room temperature. The cold-work die steel after the treatment of the method has high hardness, and the hardness values are between 66 and 67 HRC and are uniform.
Description
Technical field
The present invention relates to the working method of a kind of working method of die steel, particularly cold-work die steel.
Background technology
The mould, particularly cutting edge that cold-work die steel is made can be subject to strong friction and extruding when work, this just requires cold-work die steel should have higher hardness, intensity and wear resistance and good toughness.Keep more residual austenite after yet cold-work die steel quenches in the tissue, so that such crystalline grain of steel is thick, this will seriously reduce the use properties, particularly hardness value of this die steel.Usually people adopt thermal treatment and add alloying element and eliminate residual austenite and crystal grain thinning in the steel, though obtain good effect, the use properties of this die steel still needs further raising.
Summary of the invention
The object of the present invention is to provide a kind of processing method simple, can obtain higher hardness value and stay-in-grade a kind of method that improves cold-work die steel hardness.The present invention mainly realizes in conjunction with sub-zero treatment and temper by autoclaving.The concrete steps of the inventive method are as follows:
1. autoclaving: cold-work die steel is placed carry out pressure treatment on the pressing machine first, pressure is 2～4GPa, and Heating temperature is 820～850 ℃, and soaking time is 20～30min, the outage pressurize naturally cools to room temperature, and the circulating water flow of its cooling pressure head is 0.6～1.2L/min.
2. sub-zero treatment: the cold-work die steel sample after the autoclaving is immersed stop 120～180 min in the liquid nitrogen (196 ℃).
3. temper: the cold-work die steel after the sub-zero treatment placed carry out temper in the process furnace, Heating temperature is 150～200 ℃, and soaking time is 60～120min, and the air cooling of coming out of the stove is to room temperature.
The present invention carries out hot high pressure to the cold-work die steel sample first and processes, can obtain martensite and residual austenite body tissue, simultaneously organization internal produces the defectives such as highdensity dislocation, and these will provide more position subsequently separating out of heat treatment process interalloy carbide for cold-work die steel.Simultaneously, autoclaving again can thinning microstructure and is increased its compactness.Cold-work die steel after subsequently hot high pressure being processed carries out deepfreeze to be processed, and can impel in the steel residual austenite further to martensitic transformation.At last again the cold-work die steel sample after the sub-zero treatment is carried out temper, purpose is to eliminate the ill effects such as internal stress that produced by autoclaving and sub-zero treatment, the Carbide Precipitation that small and dispersed is arranged simultaneously has higher hardness and other performance such as toughness etc. to guarantee cold-work die steel.
The present invention compared with prior art has following advantage: processing method of the present invention is simple, easy to operate, steady quality, but the hardness value of Effective Raise cold-work die steel.
Embodiment:
Embodiment 1
Experiment material is cold-work die steel, and the massfraction wt% of its chemical ingredients is, C 0.87%, and Mn 1.02%, and Cr 0.72%, and W 0.78%, 0.34%Si.The cold-work die steel sample that will be of a size of Φ 10 * 12mm places on the CS-Ι Ι Type B six-plane piercer.Employing pressure is 2GPa, and Heating temperature is 820 ℃, and soaking time is 30min, and the pressurize of then cutting off the power supply is cooled to room temperature, and the circulating water flow of its cooling pressure head is 1.0L/min.Subsequently the cold-work die steel sample after autoclaving is immersed and stop 120 min in the liquid nitrogen in (196 ℃).At last the cold-work die steel sample after the sub-zero treatment is carried out temper in the KLX-12B chamber type electric resistance furnace, its Heating temperature is 200 ℃, soaking time 60min, and the type of cooling is air cooling.Its hardness result sees Table 1.
Embodiment 2
The composition of experiment material is identical with embodiment 1 with technological process, and adopting pressure in the present embodiment is 4GPa, and Heating temperature is 850 ℃, and soaking time is 20min, and the outage pressurize is cooled to room temperature, and the circulating water flow of its cooling pressure head is 0.6L/min.。Subsequently the cold-work die steel sample after autoclaving is immersed and stop 180 min in the liquid nitrogen (196 ℃).Last temper technique is, Heating temperature is 150 ℃, soaking time 120min, and the type of cooling is air cooling.Its hardness result sees Table 1.
Embodiment 3
The experimental technique process is identical with embodiment 1, and the massfraction wt% of material chemical composition is, C 1.02%, and Mn 0.84%, and Cr 1.14%, and W 1.32%, 0.30%Si.The autoclaving that adopts in the present embodiment is identical with embodiment 1.Subsequently the cold-work die steel sample after autoclaving is immersed and stop 150 min in the liquid nitrogen (196 ℃).Last temper technique is, Heating temperature is 150 ℃, soaking time 60min, and the type of cooling is air cooling.Its hardness result sees Table 1.
The test result of cold-work die steel hardness under table 1 different states
Annotate:Conventional thermal treatment process is in the upper table: after heating 830 ℃ of insulation 30min oil coolings, again through 180 ℃ of temper that are incubated 2min.
Above-mentioned experimental result shows: the hardness of cold-work die steel after the inventive method is processed is apparently higher than the hardness of the cold-work die steel of processing with the conventional thermal treatment process (quenching+tempering) of material.This explanation cold-work die steel has higher hardness value after the inventive method is processed.
Claims (2)
1. method that improves cold-work die steel hardness is characterized in that:
⑴ carry out pressure treatment with cold-work die steel first, and pressure is 2～4GPa, and Heating temperature is 820～850 ℃, and soaking time is 20～30min, and the outage pressurize naturally cools to room temperature, and the circulating water flow of its cooling pressure head is 0.6～1.2L/min;
⑵ the cold-work die steel sample after with autoclaving immerses in-196 ℃ of liquid nitrogen and stops 120～180 min;
⑶ the cold-work die steel after with sub-zero treatment carries out temper, and Heating temperature is 150～200 ℃, and soaking time is 60～120min, and the air cooling of coming out of the stove is to room temperature.
2. a kind of method that improves cold-work die steel hardness according to claim 1 is characterized in that: described cold-work die steel, and the massfraction wt% of its chemical ingredients is: C 0.85%～1.05%, Mn 0.80%～1.20%, Cr 0.60%～1.20%, and W 0.70%～1.40%, Si＜=0.40%.
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| CN2012105139064A CN103045831A (en) | 2012-12-05 | 2012-12-05 | Method for improving cold-work die steel hardness |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104178700A (en) * | 2014-08-29 | 2014-12-03 | 无锡柯马机械有限公司 | Preparation process of die steel |
| CN106862649A (en) * | 2017-03-30 | 2017-06-20 | 安徽锋利锐刀片制造有限公司 | A kind of high accuracy disc rolling shearing blade and its manufacture method |
| CN107435094A (en) * | 2016-05-27 | 2017-12-05 | 燕山大学 | A kind of pure iron part improves the process of hardness |
| CN107435093A (en) * | 2016-05-27 | 2017-12-05 | 燕山大学 | The super intensified method of constrained transition and the technique strengthened based on this method to pure iron or mild steel |
| CN107058879B (en) * | 2017-01-06 | 2019-02-01 | 燕山大学 | A method of improving antiwear high manganese steel hardness |
| CN109517954A (en) * | 2018-12-26 | 2019-03-26 | 重庆龙煜精密铜管有限公司 | A kind of cryogenic treatment process for copper pipe production mold |
| CN111041175A (en) * | 2019-12-25 | 2020-04-21 | 燕山大学 | High-toughness wear-resistant high manganese steel and preparation method and application thereof |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| CN107435093A (en) * | 2016-05-27 | 2017-12-05 | 燕山大学 | The super intensified method of constrained transition and the technique strengthened based on this method to pure iron or mild steel |
| CN107058879B (en) * | 2017-01-06 | 2019-02-01 | 燕山大学 | A method of improving antiwear high manganese steel hardness |
| CN106862649A (en) * | 2017-03-30 | 2017-06-20 | 安徽锋利锐刀片制造有限公司 | A kind of high accuracy disc rolling shearing blade and its manufacture method |
| CN109517954A (en) * | 2018-12-26 | 2019-03-26 | 重庆龙煜精密铜管有限公司 | A kind of cryogenic treatment process for copper pipe production mold |
| CN111041175A (en) * | 2019-12-25 | 2020-04-21 | 燕山大学 | High-toughness wear-resistant high manganese steel and preparation method and application thereof |
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Application publication date: 20130417 |