CN105986091A - Heat treatment technology of 9SiCr steel - Google Patents
Heat treatment technology of 9SiCr steel Download PDFInfo
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- CN105986091A CN105986091A CN201510048501.1A CN201510048501A CN105986091A CN 105986091 A CN105986091 A CN 105986091A CN 201510048501 A CN201510048501 A CN 201510048501A CN 105986091 A CN105986091 A CN 105986091A
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Abstract
The invention discloses a heat treatment technology of 9SiCr steel. The heat treatment technology comprises the following steps: 1) performing spheroidizing annealing pretreatment on a steel member; 2) employing a salt bath furnace for performing heat treatment on the steel member; and 3) after performing isothermal oil quenching on the 9SiCr steel, pre-tempering the 9SiCr steel. By standarding requirements, parameter conditions and attentions of the heat treatment technology, the heat treatment technology is used for the 9SiCr steel, through the steps of austenitizing, isothermal oil quenching, pre-tempering, deep cooling treatment and re-tempering on the 9SiCr steel, disadvantages of low hardenability, poor red hardness and insufficient wear resistance of the carbon cutlery steel can be overcome, and the hardness value and the wear resistance performance are increased.
Description
Technical field
The invention belongs to Technology for Heating Processing field, specifically a kind of 9SiCr steel heat treatment process.
Background technology
9SiCr steel is presently most used alloy cutlery steel kind, it is usually used in manufacturing slow cutting cutlery complex-shaped, that technology requirement deformation is little, wearability is higher, cold-working mould, such as drill bit, hand-operated reamer, screw plate, impression block and cold roll etc., compared to other steel grades, the quenching degree of 9SiCr steel, hardenability and temper resistance are higher, and it is carried out classification with isothermal hardening conveniently.9SiCr mould steel part is after general Technology for Heating Processing processes, and compared with the steel grade such as CrWMn, quenching degree, hardenability, temper resistance, intensity and hardness and wearability are the most too late, for improving product quality, it is necessary to be further improved.
Summary of the invention
The deficiency existed in view of prior art, it is an object of the invention to provide a kind of 9SiCr steel heat treatment process, can overcome the shortcoming that carbon element cutting tool steel quenching degree is low, red hardness is poor and wearability is not enough, improve its hardness number and anti-wear performance.
A kind of 9SiCr steel heat treatment process, it is characterised in that this process comprises the following steps:
(1) first steel part is carried out spheroidizing the pre-heat treatment, first steel part is heated to 790～810 DEG C, then temperature retention time 1～2h, 700～720 DEG C are dropped to Deng steel part, after carrying out again being incubated the 2-3h time, finally it is carried out stove cold, when steel part is down to 550 DEG C, being come out of the stove and carry out air cooling, now the hardness of steel part is 197～241HBS；(2) use salt bath furnace that steel part is carried out heat treatment, 9SiCr mould steel part is connected wire and puts in chamber type electric resistance furnace, heat with stove, until being heated to 900-950 DEG C of austenitizing, after insulation 8-10min；Then apply the electric field sawtooth waveforms of 100Hz, 900V, the time reach 5-8min after come out of the stove, then steel part put into magnetic field intensity be 19.37A/m, temperature be that the salt made from earth containing a comparatively high percentage of sodium chloride of 230～250 DEG C carries out isothermal oil quenching；
(3) 9SiCr mould steel part is after isothermal oil quenching, carry out pre-tempering again, heating-up temperature is at 200-220 DEG C, and the time is 1-1.5h, the most again steel part is carried out subzero treatment, subzero treatment is using liquid nitrogen as deep cooling medium, it is cooled fast to liquid nitrogen temperature-130～-190 DEG C from room temperature, steel part cryogenic temperature preferably-160～-190 DEG C, the time is 20-24h, after steel part after deep cooling low temperature through 200 DEG C again is tempered, steel part with after natural cooling to room temperature.
A kind of 9SiCr steel heat treatment process of the present invention is by the requirement of specification each step, Parameter Conditions and points for attention, this New Technology of Heat Treatment is used for 9SiCr steel, by to its austenitizing, isothermal oil quenching, pre-tempering, subzero treatment and the process such as tempering again, overcome the shortcoming that carbon element cutting tool steel quenching degree is low, red hardness is poor and wearability is not enough, improve its hardness number and anti-wear performance.
Detailed description of the invention
Below in conjunction with embodiment the present invention made into → walk explanation, its operating procedure is as follows:
A kind of 9SiCr steel heat treatment process, it is characterised in that this process comprises the following steps:
(1) first steel part is carried out spheroidizing the pre-heat treatment, first steel part is heated to 790～810 DEG C, then temperature retention time 1～2h, 700～720 DEG C are dropped to Deng steel part, after carrying out again being incubated the 2-3h time, finally it is carried out stove cold, when steel part is down to 550 DEG C, being come out of the stove and carry out air cooling, now the hardness of steel part is 197～241HBS；(2) use salt bath furnace that steel part is carried out heat treatment, 9SiCr mould steel part is connected wire and puts in chamber type electric resistance furnace, heat with stove, until being heated to 900-950 DEG C of austenitizing, after insulation 8-10min；Then apply the electric field sawtooth waveforms of 100Hz, 900V, the time reach 5-8min after come out of the stove, then steel part put into magnetic field intensity be 19.37A/m, temperature be that the salt made from earth containing a comparatively high percentage of sodium chloride of 230～250 DEG C carries out isothermal oil quenching；
(3) 9SiCr mould steel part is after isothermal oil quenching, carry out pre-tempering again, heating-up temperature is at 200-220 DEG C, and the time is 1-1.5h, the most again steel part is carried out subzero treatment, subzero treatment is using liquid nitrogen as deep cooling medium, it is cooled fast to liquid nitrogen temperature-130～-190 DEG C from room temperature, steel part cryogenic temperature preferably-160～-190 DEG C, the time is 20-24h, after steel part after deep cooling low temperature through 200 DEG C again is tempered, steel part with after natural cooling to room temperature.
The preferred embodiment of the present invention described in detail above.It is to be understood that those of ordinary skill in the art just can make many modifications and variations according to the design of the present invention without creative work.Therefore, all technical staff in the art are the most on the basis of existing technology by logic minute analysis, reasoning or the available technical scheme of limited experiment, the protection domain being all defined in the patent claims.
Claims (1)
1. a 9SiCr steel heat treatment process, it is characterised in that this process comprises the following steps:
(1) first steel part is carried out spheroidizing the pre-heat treatment, first steel part is heated to 790～810 DEG C, then temperature retention time 1～2h, 700～720 DEG C are dropped to Deng steel part, after carrying out again being incubated the 2-3h time, finally it is carried out stove cold, when steel part is down to 550 DEG C, being come out of the stove and carry out air cooling, now the hardness of steel part is 197～241HBS；(2) use salt bath furnace that steel part is carried out heat treatment, 9SiCr mould steel part is connected wire and puts in chamber type electric resistance furnace, heat with stove, until being heated to 900-950 DEG C of austenitizing, after insulation 8-10min；Then apply the electric field sawtooth waveforms of 100Hz, 900V, the time reach 5-8min after come out of the stove, then steel part put into magnetic field intensity be 19.37A/m, temperature be that the salt made from earth containing a comparatively high percentage of sodium chloride of 230～250 DEG C carries out isothermal oil quenching；(3) 9SiCr mould steel part is after isothermal oil quenching, carry out pre-tempering again, heating-up temperature is at 200-220 DEG C, and the time is 1-1.5h, the most again steel part is carried out subzero treatment, subzero treatment is using liquid nitrogen as deep cooling medium, it is cooled fast to liquid nitrogen temperature-130～-190 DEG C from room temperature, steel part cryogenic temperature preferably-160～-190 DEG C, the time is 20-24h, after steel part after deep cooling low temperature through 200 DEG C again is tempered, steel part with after natural cooling to room temperature.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510048501.1A CN105986091A (en) | 2015-01-30 | 2015-01-30 | Heat treatment technology of 9SiCr steel |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510048501.1A CN105986091A (en) | 2015-01-30 | 2015-01-30 | Heat treatment technology of 9SiCr steel |
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| CN105986091A true CN105986091A (en) | 2016-10-05 |
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| CN201510048501.1A Pending CN105986091A (en) | 2015-01-30 | 2015-01-30 | Heat treatment technology of 9SiCr steel |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106435127A (en) * | 2016-12-12 | 2017-02-22 | 江苏大学 | Cryogenic treatment method of improving abrasive resistance of CrWMn alloy 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 |
-
2015
- 2015-01-30 CN CN201510048501.1A patent/CN105986091A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106435127A (en) * | 2016-12-12 | 2017-02-22 | 江苏大学 | Cryogenic treatment method of improving abrasive resistance of CrWMn alloy 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 |
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Application publication date: 20161005 |
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| WD01 | Invention patent application deemed withdrawn after publication |