CN103451385A - Tempering technology of ring die of 42CrMo steel pellet mill - Google Patents
Tempering technology of ring die of 42CrMo steel pellet mill Download PDFInfo
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Abstract
The invention designs a tempering technology of a ring die of a 42CrMo steel pellet mill. The technology is characterized in that of the ring die of the pellet mill is made of 42CrMo steel; the tempering technological parameters are that the quenching heating temperature of quenched-tempered heat treatment is 850+/-10 DEG C; the heat preservation time is 2.5 hours. The technology comprises the following steps: suspending a work-piece into a supersaturated tri-nitrate water solution quenching medium to intercool to about 40 DEG C, suspending into water to clean after cooling is ended; finally loading the work-piece inside a tempering furnace, wherein the tempering heating temperature is 590+/-10 DEG C, and the heat preservation time is 3.5 hours; and then water-cooling to room temperature. The product obtained by the optimized tempering technology is even in ingredient, tissue, and hardness. Thermal stress is reduced to a certain extent, so that deformation of the work-piece is reduced; the tearing tendency is also reduced; the tempering technology is particularly effective on the work-piece with incommensurable sizes in thick and thin parts; the qualified rate of the product is increased; the production cost is reduced.
Description
Technical field
The invention belongs to the thermal treatment process technology field, relate to a kind of hardening and tempering process of 42CrMo steel ring die of granulator.
Background technology
Ring die of granulator is made through operations such as forging and stamping, cutting, boring, thermal treatments by structural carbon steel, structural alloy steel and stainless steel usually.Ring mould material used and each manufacturing procedure have direct impact to its work-ing life and granulate quality, output.Structural carbon steel mainly contains 45 steel, and its heat treatment hardness is generally HRC45～50, and its wear resistance and erosion resistance are all poor; Steel alloy mainly contains the 20CrMnTi material, and it is to process by surface heats such as surface cementations, processes hardness more than HRC50, and there is good comprehensive mechanical property, the ring mould intensity of being manufactured by this class material is high, and wear resistance is better than 45 steel, but that shortcoming is erosion resistance is bad.Stainless steel mainly has the 4Cr13 material, and the rigidity of this material and toughness are all better, and thermal treatment is integral quenching, and hardness is greater than HRC50, and has good wear resistance and erosion resistance, but that shortcoming is price is higher.
The ring mould is the core component of nodulizer, is the consumable accessory of the high value of nodulizer, and the quality of its quality directly affects user's economic benefit.Feed link is crossed the nib extrusion molding, in use bears for a long time the squeeze of pressure roller and the frictional force of material, makes it to produce stress in bending and contacts stress, easily causes encircling mould and loses efficacy.The 42CrMo steel has that intensity is high, also better characteristics of good toughness, hardening capacity, belongs to ultrahigh-strength steel.There is no obvious temper brittleness when tempering, after modifier treatment, safe range of stress and impact resistance can be significantly improved, and toughness is better when low temperature.Due to good hardening capacity and intensity, this steel is less at the quenching after strain, can be used for the larger forging in high, the modified cross section of manufacturing property index request, through being commonly used to do large profile shaft and important movement parts, in metallurgical equipment the application more, can replace 45
#steel, its intensity, rigidity etc. are relatively better, and after heat treatment comprehensive mechanical property is better.In actual production process, if adopt common thermal treatment process workpiece to tend to scrap because cracking, affected quality product, caused financial loss.And its composition of product, microstructure and hardness that the hardening and tempering process that adopts optimization obtains are more even, reduce to a certain extent thermal stresses, workpiece deformation, tearing tendency are reduced, especially effective to the workpiece of thick, thin spot size great disparity, improve conforming product rate, reduced production cost.
Summary of the invention
The hardening and tempering process that the object of the invention is to avoid the deficiencies in the prior art part and a kind of 42CrMo steel ring die of granulator is provided, thus problems of the prior art effectively solved.
Purpose of the present invention can be by realizing by the following technical solutions: the hardening and tempering process of described a kind of 42CrMo steel ring die of granulator; its characteristics are that described ring die of granulator material is the 42CrMo ultrahigh-strength steel; its heat treating method is modifier treatment, and step is as follows:
(1) the quenching stage: after the ring mould is machined, it is heated in heat treatment furnace to 850 ℃ ± 10 ℃ of austenitizing temperatures, and increase by one section soaking time 2.5h, then will encircle mould and hang in supersaturation three glass gall solution quenchants and be cooled to 40 ℃ of left and right, and after cooling end, hang in water and clean.
(2) the tempering stage: it is 590 ℃ ± 10 ℃ that the ring die of granulator after quenching is heated to temperature in process furnace, and after soaking time 3.5h, water-cooled is to room temperature.
The hardening and tempering process of described a kind of 42CrMo steel ring die of granulator; its beneficial effect comprises; have that intensity is high, good toughness; safe range of stress and impact resistance can be significantly improved; and toughness is better; making to encircle mould has high comprehensive mechanical property and high abrasive wear resistant weld deposit ability, and be significantly improved work-ing life.Its composition of product, microstructure and hardness that the hardening and tempering process that employing is optimized obtains are more even, reduce to a certain extent thermal stresses, workpiece deformation, tearing tendency are reduced, especially effective to the workpiece of thick, thin spot size great disparity, improve conforming product rate, reduced production cost.
The accompanying drawing explanation
Figure is the quenching-and-tempering process figure of 42CrMo steel ring die of granulator of the present invention.
Embodiment
Embodiment 1, the hardening and tempering process of described a kind of 42CrMo steel ring die of granulator.Its characteristics are: described ring die of granulator material is the 42CrMo steel, and its hardening and tempering process parameter is:
(1) the quenching stage: after the ring mould is machined, it is heated in heat treatment furnace to 860 ℃ of austenitizing temperatures, and increase by one section soaking time 2.5h, and then will encircle mould and hang in supersaturation three glass gall solution quenchants and be cooled to 40 ℃ of left and right, hang in water and clean after cooling end.
(2) the tempering stage: it is 590 ℃ that the ring die of granulator after quenching is heated to temperature in process furnace, and after soaking time 3.5h, water-cooled is to room temperature.
Embodiment 2, the hardening and tempering process of described a kind of 42CrMo steel ring die of granulator.Its characteristics are: described ring die of granulator material is the 42CrMo steel, and its hardening and tempering process parameter is:
(1) the quenching stage: after the ring mould is machined, it is heated in heat treatment furnace to 840 ℃ of austenitizing temperatures, and increase by one section soaking time 2.5h, and then will encircle mould and hang in supersaturation three glass gall solution quenchants and be cooled to 40 ℃ of left and right, hang in water and clean after cooling end.
(2) the tempering stage: it is 600 ℃ that the ring die of granulator after quenching is heated to temperature in process furnace, and after soaking time 3.5h, water-cooled is to room temperature.
Its composition of product, microstructure and hardness that the hardening and tempering process that employing is optimized obtains are more even, reduce to a certain extent thermal stresses, workpiece deformation, tearing tendency are reduced, especially effective to the workpiece of thick, thin spot size great disparity, improve conforming product rate, reduced production cost.
Claims (1)
1. the hardening and tempering process of a 42CrMo steel ring die of granulator, its characteristics are that described ring die of granulator material is the 42CrMo ultrahigh-strength steel, and its heat treating method is modifier treatment, and step is as follows:
(1) the quenching stage: after the ring mould is machined, it is heated in heat treatment furnace to 850 ℃ ± 10 ℃ of austenitizing temperatures, and increase by one section soaking time 2.5h, then will encircle mould and hang in supersaturation three glass gall solution quenchants and be cooled to 40 ℃ of left and right, hang in clear Shen in water after cooling end.
(2) the tempering stage: it is 590 ℃ ± 10 ℃ that the ring die of granulator after quenching is heated to temperature in process furnace, and after soaking time 3.5h, water-cooled is to room temperature.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN 201310399606 CN103451385A (en) | 2013-08-30 | 2013-08-30 | Tempering technology of ring die of 42CrMo steel pellet mill |
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| CN 201310399606 CN103451385A (en) | 2013-08-30 | 2013-08-30 | Tempering technology of ring die of 42CrMo steel pellet mill |
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| CN103451385A true CN103451385A (en) | 2013-12-18 |
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| CN 201310399606 Pending CN103451385A (en) | 2013-08-30 | 2013-08-30 | Tempering technology of ring die of 42CrMo steel pellet mill |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106868257A (en) * | 2015-12-14 | 2017-06-20 | 陕西宏远航空锻造有限责任公司 | A kind of quenching assay method of test 42CrMo material cold shock structure properties |
| CN107254575A (en) * | 2017-06-01 | 2017-10-17 | 马鞍山钢铁股份有限公司 | It is a kind of to remove the heat treatment method that ferrite net metallographic structure improves steel strength |
| CN109439877A (en) * | 2018-08-22 | 2019-03-08 | 重庆银雁科技有限公司 | A kind of motorcycle rear axle hardening and tempering process |
| CN111647721A (en) * | 2020-06-18 | 2020-09-11 | 建龙北满特殊钢有限责任公司 | Method for solving low-temperature impact energy of high-alloy structural steel after hardening and tempering |
| CN112899462A (en) * | 2021-01-20 | 2021-06-04 | 常州朱美拉模具技术有限公司 | Ring die heat treatment process and processing equipment thereof |
-
2013
- 2013-08-30 CN CN 201310399606 patent/CN103451385A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106868257A (en) * | 2015-12-14 | 2017-06-20 | 陕西宏远航空锻造有限责任公司 | A kind of quenching assay method of test 42CrMo material cold shock structure properties |
| CN107254575A (en) * | 2017-06-01 | 2017-10-17 | 马鞍山钢铁股份有限公司 | It is a kind of to remove the heat treatment method that ferrite net metallographic structure improves steel strength |
| CN109439877A (en) * | 2018-08-22 | 2019-03-08 | 重庆银雁科技有限公司 | A kind of motorcycle rear axle hardening and tempering process |
| CN111647721A (en) * | 2020-06-18 | 2020-09-11 | 建龙北满特殊钢有限责任公司 | Method for solving low-temperature impact energy of high-alloy structural steel after hardening and tempering |
| CN112899462A (en) * | 2021-01-20 | 2021-06-04 | 常州朱美拉模具技术有限公司 | Ring die heat treatment process and processing equipment thereof |
| CN112899462B (en) * | 2021-01-20 | 2022-08-23 | 常州朱美拉模具技术有限公司 | Ring die heat treatment process and processing equipment thereof |
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Application publication date: 20131218 |
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