CN102230062A - Heat treatment process for improving strength and toughness of 9SiCr die steel - Google Patents
Heat treatment process for improving strength and toughness of 9SiCr die steel Download PDFInfo
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- CN102230062A CN102230062A CN 201110155737 CN201110155737A CN102230062A CN 102230062 A CN102230062 A CN 102230062A CN 201110155737 CN201110155737 CN 201110155737 CN 201110155737 A CN201110155737 A CN 201110155737A CN 102230062 A CN102230062 A CN 102230062A
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Abstract
The invention discloses a heat treatment process for improving the strength and toughness of 9SiCr die steel. The 9SiCr die steel is subjected to the final heat treatment after preheating treatment. The final heat treatment comprises the following steps of: heating to 880-920 DEG C for austenization, performing isothermal oil quenching at 230-260 DEG C, pre-tempering for 1 hour at 160-200 DEG C, then performing cryogenic treatment for at least 24 hours at a temperature between -130 DEG C and -190 DEG C, and finally tempering for 2 hours at 180-200 DEG C. With the process provided by the invention, the hardness value of a die is increased as compared with that of the isothermal quenching and tempering process and close to that of the quenching and tempering process; the impact toughness of the die is greatly increased as compared with those of the isothermal quenching and tempering process and the quenching and low-temperature tempering process and increased by 2 to 3 times as compared with that of the isothermal quenching and tempering process. Besides, both the wear-resistant property and the service life of the die are greatly improved.
Description
Technical field
The invention belongs to thermal treatment process, especially die steel thermal treatment process technology field.
Background technology
Mould is the important process equipment in the industrial production, and under the historical background of the big production of modern mechanicalization, mould is increasing to the importance that enterprise produces in batches, and it is determining the development ability of quality, benefit and the product innovation of product to a great extent.Along with the lifting of development in science and technology and commercial production levels, the development of die industry is for enterprise's high benefit production provides strong assurance.
The 9SiCr material is a kind of tool steel commonly used and die steel, has higher hardening capacity and hardenability, and temper resistance is higher simultaneously.Therefore, the 9SiCr material is widely used in being processed into different shape complexity, the little tool and mould of distortion.
The treatment process that 9SiCr is now commonly used is thermal pretreatment and quenching or the final thermal treatment of isothermal quenching+low-temperaturetempering.
Method for warming up has high temperature annealing, Spheroidizing Annealing, normalizing, modulation etc.Wherein commonly used is Spheroidizing Annealing, its method: be heated to 790～810 ℃ and be incubated 1～2h, reduce to 700～720 ℃ of insulation certain hours then, last stove is chilled to 550 ℃ of air coolings of coming out of the stove, and handling back hardness is 197～241HBS;
Final heat treating method is as follows:
(1) quenching+low-temperature tempering heat treatment technology: during 830～890 ℃ of oil quenchings, again through 150～200 ℃ of tempering;
(2) isothermal quenching+low-temperature tempering heat treatment technology: 890～920 ℃ of heating, 210～270 ℃ of isothermal oil quenching, again through 150～200 ℃ of tempering.
Wherein, technology (1) has higher hardness, and hardness is 61～63HRC, but toughness is lower.Adopting process (2), the decreasing of its hardness ratio technology (1), but impelling strength can obtain certain raising.More than two kinds of final treatment process methods the intensity of this material and toughness can not be got both.Do not have best over-all properties.
In order to improve 9SiCr die steel material performance, research improves the heat-treatment technology method of die steel performance, improves the obdurability of 9SiCr steel simultaneously, helps to significantly improve the performance and the work-ing life of die steel, develop the use potentiality of traditional steel grade, this has great actual value and meaning.
Summary of the invention
In view of the above deficiency of prior art, a kind of heat-treatment technology method that improves 9SiCr die steel obdurability of purpose research of the present invention makes it to have more good hardness and toughness and long work-ing life.
The objective of the invention is to realize by following means:
A kind of heat-treatment technology method that improves 9SiCr die steel obdurability, through imposing final heat treatment step after the thermal pretreatment again 9SiCr die steel is heat-treated. after thermal pretreatment is finished, described final heat treatment step is: be heated to 880～920 ℃ of austenitizings, 230～260 ℃ of isothermal oil quenchings, through 160～200 ℃ of pre-tempering 1 hour, then-130～-190 ℃ of sub-zero treatments 24 hours or more than, again through 180～200 degree tempering 2 hours.
The solution of the present invention has adopted isothermal quenching and sub-zero treatment bonded novel process, and 9SiCr material toughness and tenacity has significant change, bigger raising the over-all properties of this material, the use properties and the life-span of improving the 9SiCr steel die simultaneously.Present method combines isothermal quenching technique with cryogenics, obtain its flexible novel process of raising of a kind of the best.Compare with the treatment process of same conventional quenching/isothermal quenching+low-temperaturetempering, not only on mechanical property, obtain bigger raising, all be significantly improved at wear resisting property with on work-ing life simultaneously.
Embodiment:
The invention will be further described below in conjunction with embodiment.
Embodiment:
The 9SiCr mould is after finishing main mechanically shape, carry out the Spheroidizing Annealing thermal pretreatment, its method: be heated to 790～810 ℃ and be incubated 1～2h, reduce to 700～720 ℃ of insulation certain hours then, last stove is chilled to 550 ℃ of air coolings of coming out of the stove, and handling back hardness is 197～241HBS.Carry out final thermal treatment then: salt bath is heated to 900 ℃ of austenitizings, 230-250 ℃ of isothermal oil quenching, 200 ℃ of pre-tempering 1 hour; Deep cooling-160-190 ℃ 24 hours, again through 200 ℃ of tempering 2 hours.Describedly adopt liquid nitrogen as deep cooling medium, be cooled fast to liquid nitrogen temperature (130～-190 ℃) from room temperature in sub-zero treatment, be incubated 24 hours or more than, taking-up is placed under the room temperature then, treats that temperature retrieval arrives room temperature.
Gained die steel mechanical property and use properties technical parameter are as follows:
1) organizationally: the abundant refinement of present method matrix, reduced residual austenite, obtain disperse refinement carbide simultaneously.
2) hardness value:
| Technology | Quenching+low-temperaturetempering | The isothermal quenching tempering | Present method |
| Hardness value/HRC | 60.5-63.0 | 59.5-62.0 | 60.5-62.5 |
Present method gained hardness value improves than isothermal quenching tempering, and near the hardness value of Q-tempering method.
3) impelling strength:
| Technology | Quenching+low-temperaturetempering | The isothermal quenching tempering | Present method |
| Ballistic work Ak/J | ?12.5-32.5 | 48.0-60.0 | 80.5-190.0 |
Present method gained impelling strength significantly improves than isothermal quenching tempering, quenching low-temperaturetempering.Improve 2-3 doubly than isothermal quenching tempering.
4) bending property:
Present method gained bending strength ratio isothermal quenching tempering, quenching low-temperaturetempering significantly improve.
5) wear resisting property: present method gained wear resisting property significantly improves than isothermal quenching tempering, quenching low-temperaturetempering.
6) work-ing life of the mould of Zhi Zuoing: the application's patent is applied on the actual mould, and on-the-spot work-ing life is than having improved about 3-5 the work-ing life of methods such as common isothermal quenching tempering, quenching low-temperaturetempering doubly.
Though being thermal pretreatment with the Spheroidizing Annealing, describes above embodiment, but find in test, adopt other thermal pretreatment, for example high temperature annealing, normalizing, modulation, implement the final thermal treatment of the inventive method then, obtain die steel performance with the present embodiment basically identical.Same describedly be heated to 880～920 ℃ of austenitizings and comprise salt bath heating, protective medium heating, heating under vacuum, air heating austenitizing.
More than show and described principal character of the present invention and embodiment; one skilled in the art will appreciate that; embodiment described here is in order to help reader understanding's principle of the present invention; without departing from the spirit and scope of the present invention; the present invention also can also have other various changes and modifications, should be understood that in protection scope of the present invention.The claimed scope of the present invention is defined by the equivalent of appending claims and invention thought.
Claims (4)
1. heat-treatment technology method that improves 9SiCr die steel obdurability, comprise that imposing final heat treatment step after pre-treatment again handles 9SiCr die steel, it is characterized in that, after thermal pretreatment is finished, described final heat treatment step is: be heated to 880～920 ℃ of austenitizings, 230～260 ℃ of isothermal oil quenchings were through 160～200 ℃ of pre-tempering 1 hour, then-130～-190 ℃ of sub-zero treatments at least 24 hours, again through 180～200 degree tempering 2 hours.
2. according to the heat-treatment technology method of the described raising 9SiCr die steel obdurability of claim 1, it is characterized in that described thermal pretreatment comprises high temperature annealing, Spheroidizing Annealing, normalizing, modulation treatment.
3. according to the heat-treatment technology method of the described raising 9SiCr die steel obdurability of claim 1, it is characterized in that, describedly be heated to 880～920 ℃ of austenitizings and comprise salt bath heating, protective medium heating, heating under vacuum, air heating austenitizing.
4. according to the heat-treatment technology method of the described raising 9SiCr die steel obdurability of claim 1, it is characterized in that, described-130～-190 ℃ of sub-zero treatments adopt liquid nitrogen as deep cooling medium, be cooled fast to liquid nitrogen temperature from room temperature, insulation is no less than 24 hours, taking-up is placed under the room temperature then, treats that temperature retrieval arrives room temperature.
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| CN 201110155737 CN102230062A (en) | 2011-06-10 | 2011-06-10 | Heat treatment process for improving strength and toughness of 9SiCr die steel |
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| CN 201110155737 CN102230062A (en) | 2011-06-10 | 2011-06-10 | Heat treatment process for improving strength and toughness of 9SiCr die steel |
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Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102534134A (en) * | 2012-01-06 | 2012-07-04 | 莱芜钢铁集团有限公司 | Bainite isothermal quenching thermal treatment process method for medium-carbon bearing steel |
| CN102873203A (en) * | 2012-09-28 | 2013-01-16 | 蚌埠市昊业滤清器有限公司 | Upper die set convenient for material return in screw plate forming die |
| TWI447230B (en) * | 2011-12-27 | 2014-08-01 | Metal Ind Res & Dev Ct | A manufacturing method for austempered ductile iron |
| CN104404223A (en) * | 2014-12-18 | 2015-03-11 | 无锡伊诺永利文化创意有限公司 | Isothermal quenching and tempering process for 9SiCr steel circular dies |
| CN104531960A (en) * | 2014-12-18 | 2015-04-22 | 无锡伊诺永利文化创意有限公司 | 9SiCr steel circular die isothermal spheroidizing process |
| CN104789743A (en) * | 2015-04-30 | 2015-07-22 | 柳州市新锐科技有限公司 | Punching die material thermal treatment method |
| CN105063321A (en) * | 2015-09-26 | 2015-11-18 | 郭策 | Preparation method of high-strength scaffold connecting piece |
| CN105063320A (en) * | 2015-09-21 | 2015-11-18 | 长沙天和钻具机械有限公司 | Method for preparing high air pressure impactor piston |
| CN105586477A (en) * | 2016-03-01 | 2016-05-18 | 江苏星火特钢有限公司 | Method for improving hardness of 3D printing martensitic stainless steel structural part |
| CN106324210A (en) * | 2016-09-14 | 2017-01-11 | 安徽工程大学 | Method for testing performance of Cr12 steel for brick making dies |
| CN106435127A (en) * | 2016-12-12 | 2017-02-22 | 江苏大学 | Cryogenic treatment method of improving abrasive resistance of CrWMn alloy steel |
| CN107245691A (en) * | 2017-06-08 | 2017-10-13 | 江苏大学 | Metal material Compound Heat Treatment surface reinforcing method |
| CN107475488A (en) * | 2017-07-12 | 2017-12-15 | 昌河飞机工业（集团）有限责任公司 | A kind of high-speed steel heat-treatment technology method |
| CN110343818A (en) * | 2018-05-18 | 2019-10-18 | 刘鹏宇 | A kind of heat treatment method of mould steel |
| CN112195326A (en) * | 2020-09-27 | 2021-01-08 | 宁夏天地西北煤机有限公司 | Deep cooling process for strengthening performance of tool and die steel |
| CN112853071A (en) * | 2020-12-30 | 2021-05-28 | 无锡格瑞斯精密机械有限公司 | Heat treatment process for aluminum alloy capacitor shell stamping die |
| CN114703425A (en) * | 2022-04-07 | 2022-07-05 | 燕山大学 | Martensite and bainite dual-phase hot work die steel and preparation method thereof |
| CN115055694A (en) * | 2022-05-23 | 2022-09-16 | 上海交通大学 | Preparation method for manufacturing ultrahigh-strength stainless steel material with ultrahigh strength-elongation product by additive manufacturing |
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| CN1363695A (en) * | 2001-10-16 | 2002-08-14 | 甘肃工业大学 | Deep-cold treating technology of steel workpiece |
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2011
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| CN1363695A (en) * | 2001-10-16 | 2002-08-14 | 甘肃工业大学 | Deep-cold treating technology of steel workpiece |
Non-Patent Citations (1)
| Title |
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| 《热处理》 20031231 杨国正 提高9SiCr冷冲孔模使用寿命的等温淬火工艺研究 第43-44页 1-4 , * |
Cited By (22)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI447230B (en) * | 2011-12-27 | 2014-08-01 | Metal Ind Res & Dev Ct | A manufacturing method for austempered ductile iron |
| CN102534134B (en) * | 2012-01-06 | 2013-12-18 | 莱芜钢铁集团有限公司 | Bainite isothermal quenching thermal treatment process method for medium-carbon bearing steel |
| CN102534134A (en) * | 2012-01-06 | 2012-07-04 | 莱芜钢铁集团有限公司 | Bainite isothermal quenching thermal treatment process method for medium-carbon bearing steel |
| CN102873203A (en) * | 2012-09-28 | 2013-01-16 | 蚌埠市昊业滤清器有限公司 | Upper die set convenient for material return in screw plate forming die |
| CN102873203B (en) * | 2012-09-28 | 2014-09-17 | 蚌埠市昊业滤清器有限公司 | Upper die set convenient for material return in screw plate forming die |
| CN104404223A (en) * | 2014-12-18 | 2015-03-11 | 无锡伊诺永利文化创意有限公司 | Isothermal quenching and tempering process for 9SiCr steel circular dies |
| CN104531960A (en) * | 2014-12-18 | 2015-04-22 | 无锡伊诺永利文化创意有限公司 | 9SiCr steel circular die isothermal spheroidizing process |
| CN104789743A (en) * | 2015-04-30 | 2015-07-22 | 柳州市新锐科技有限公司 | Punching die material thermal treatment method |
| CN105063320B (en) * | 2015-09-21 | 2017-06-16 | 长沙天和钻具机械有限公司 | A kind of preparation method of high-wind pressure impactor piston |
| CN105063320A (en) * | 2015-09-21 | 2015-11-18 | 长沙天和钻具机械有限公司 | Method for preparing high air pressure impactor piston |
| CN105063321A (en) * | 2015-09-26 | 2015-11-18 | 郭策 | Preparation method of high-strength scaffold connecting piece |
| CN105586477A (en) * | 2016-03-01 | 2016-05-18 | 江苏星火特钢有限公司 | Method for improving hardness of 3D printing martensitic stainless steel structural part |
| CN106324210A (en) * | 2016-09-14 | 2017-01-11 | 安徽工程大学 | Method for testing performance of Cr12 steel for brick making dies |
| CN106435127A (en) * | 2016-12-12 | 2017-02-22 | 江苏大学 | Cryogenic treatment method of improving abrasive resistance of CrWMn alloy steel |
| CN107245691A (en) * | 2017-06-08 | 2017-10-13 | 江苏大学 | Metal material Compound Heat Treatment surface reinforcing method |
| CN107475488A (en) * | 2017-07-12 | 2017-12-15 | 昌河飞机工业（集团）有限责任公司 | A kind of high-speed steel heat-treatment technology method |
| CN110343818A (en) * | 2018-05-18 | 2019-10-18 | 刘鹏宇 | A kind of heat treatment method of mould steel |
| CN112195326A (en) * | 2020-09-27 | 2021-01-08 | 宁夏天地西北煤机有限公司 | Deep cooling process for strengthening performance of tool and die steel |
| CN112853071A (en) * | 2020-12-30 | 2021-05-28 | 无锡格瑞斯精密机械有限公司 | Heat treatment process for aluminum alloy capacitor shell stamping die |
| CN114703425A (en) * | 2022-04-07 | 2022-07-05 | 燕山大学 | Martensite and bainite dual-phase hot work die steel and preparation method thereof |
| CN114703425B (en) * | 2022-04-07 | 2022-10-14 | 燕山大学 | Martensite and bainite dual-phase hot work die steel and preparation method thereof |
| CN115055694A (en) * | 2022-05-23 | 2022-09-16 | 上海交通大学 | Preparation method for manufacturing ultrahigh-strength stainless steel material with ultrahigh strength-elongation product by additive manufacturing |
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Application publication date: 20111102 |