CN102776471A - Carburizing quenching technology for low-carbon alloy steel parts - Google Patents
Carburizing quenching technology for low-carbon alloy steel parts Download PDFInfo
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Abstract
The invention discloses a carburizing quenching technology for low-carbon alloy steel parts. The carburizing quenching technology comprises the following steps: (1) feeding materials into a furnace; (2) exhausting; (3) forcibly carburizing; (4) diffusing; (5) cooling and discharging; (6) tempering at high temperature; (7) quenching; and (8) tempering at low temperature. The low-carbon alloy steel parts processed by the technology disclosed by the invention have marcro metallography structure obviously greater than the low-carbon alloy steel parts processed by the prior art; and the low-carbon alloy steel parts have the advantages of relatively low carburizing depth, superior comprehensive mechanical performance, and relatively high surface hardness, and the improvement on the resistance to abrasion.
Description
Technical field
The present invention relates to a kind of thermal treatment process that improves part comprehensive mechanical performance and surface abrasion ability, relate in particular to the carburizing quenching process of oil motor strength members such as a kind of wrist pin that adopts low-carbon alloy steel to make, roller, belong to the heat treatment technics field.Background technology
In the oil motor operational process; The strength member of wrist pin, roller even flowing bears very big repeated stress; The long term operation wearing and tearing are bigger, and wrist pin, roller integral body must have good comprehensive mechanical performance, and piece surface must have higher antiwear property.These two kinds of parts select for use low-carbon alloy steel to make, and improve its comprehensive mechanical performance and surface abrasion ability through the pit carburizing furnace carburizing and quenching again.The carburizing quenching process of existing piston pin, roller adopts strong carburizing gesture 1.3; Diffusion carbon potential 1.0; The technology of heating quenching once more after slow cooling after the carburizing adopts macroscopical metallographic structure of parts such as wrist pin that this thermal treatment process handled, roller and the requirement that comprehensive mechanical performance all is difficult to satisfy the oil motor operation condition.
Summary of the invention
The objective of the invention is to overcome the deficiency of prior art, a kind of low-carbon alloy steel carburizing quenching process is provided, improve the comprehensive mechanical performance and the antiwear property of low-carbon alloy steel part.
The present invention is achieved through following technical scheme:
A kind of low-carbon alloy steel part carburizing quenching process may further comprise the steps:
(1) advance stove, furnace temperature is in the time of 910-930 ℃, and part advances pit carburizing furnace, and furnace temperature drops to 760 ℃, is warming up to 910-930 ℃ again;
(2) exhaust, furnace temperature exhaust when 760 ℃ are raised to 910-930 ℃, evacuation time is 60 minutes; Exhaust phase splashes into 120 droplets/minute of methyl alcohol, to temperature back setting-out, and splashes into 180 droplets/minute of kerosene; Set up carbon potential rapidly, can close sample aperture when carbon potential reaches 0.8-0.9 in stove;
(3) ooze by force, the setting carbon potential is 1.1-1.2, kerosene drip the amount of releasing by the carbon potential appearance by setting automatic control of carbon potential, 80 droplets/minute of methyl alcohol; Can sample to setting behind the carbon potential 10 hours, the carburized depth of sampling reaches 2/3 o'clock of the processing requirement degree of depth can transfer diffusion phase to;
(4) diffusion, settings carbon potential is 0.8-0.9, kerosene drip the amount of releasing by the carbon potential appearance by the setting automatic control of carbon potential, kerosene is controlled by the carbon potential appearance automatically, 80 droplets/minute of methyl alcohol; Spread and can sample after 10 hours, when case depth reaches 2.0-2.5mm, cooling;
(5) cooling is come out of the stove, and design temperature is 860-870 ℃, and is incubated 40 minutes, and it is air-cooled to come out of the stove;
(6) high tempering, design temperature are 650-670 ℃, are incubated 3 hours, splash into a small amount of kerosene to reduce the oxidation and decarbonization phenomenon of part, the air cooling of coming out of the stove behind the 820-830 ℃ of high tempering;
(7) quench, design temperature is 820-830 ℃, splashes into a small amount of kerosene to reduce the oxidation and decarbonization phenomenon of part, the oil cooling of coming out of the stove after the insulation;
(8) low-temperaturetempering, design temperature are 170-190 ℃, are incubated 6 hours, the air cooling of coming out of the stove.
The object of the invention can also further realize through following technical measures.
Aforesaid low-carbon alloy steel part carburizing quenching process, the trade mark of wherein said low-carbon alloy steel is 18CrNiMo7-6.
Macroscopical metallographic structure and the Decarburized depth that adopts the low-carbon alloy steel part that low-carbon alloy steel part that carburizing quenching process of the present invention handled and existing carburizing quenching process handled is to such as table 1:
Table 1
| The macroscopic view metallographic structure | Thick carbide rank | The carbide network rank | Microstructure rank behind the Q-tempering | Decarburized depth |
| Prior art | Greater than 3 grades (defective) | Greater than 3 grades (defective) | Greater than 3 grades (defective) | Greater than 0.1mm |
| The present invention | The 1-2 level | The 1-2 level | The 1-3 level | Less than 0.1mm |
The judgment criteria JB/T8881-2001 that uses " bearings parts carburizing heat treatment technics condition "
Adopt the comprehensive mechanical performance such as the table 2 of the low-carbon alloy steel part that carburizing quenching process of the present invention handled:
Table 2
| Mechanical performance index | Ys MPa | Tensile strength MPa | Unit elongation % | Relative reduction in area % |
| The present invention | Greater than 700 | 1100-1300 | Greater than 10 | Greater than 40 |
From table 1 and table 2, can find out; Macroscopical metallographic structure of the low-carbon alloy steel part of handling through the present invention obviously is superior to the low-carbon alloy steel part that prior art was handled; Decarburized depth is less; Excellent comprehensive mechanical property, and surface hardness reaches HRc59-61, improved the antiwear property of low-carbon alloy steel part.
Advantage of the present invention and characteristics will illustrate through the non-limitative illustration of following preferred embodiment and explain that these embodiment only provide with reference to accompanying drawing as an example.
Description of drawings
Fig. 1 is heat treatment cycle curve figure of the present invention.
Embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is described further:
Embodiment one: material is the carburizing quenching process of the diesel engine piston pin of 18CrNiMo7-6, quench-hardened case 1.8-2.3mm, cementation zone 2.0-2.5mm, hardness HRc59-63.
As shown in Figure 1, present embodiment may further comprise the steps:
(1) advance stove, furnace temperature is in the time of 910-930 ℃, and part advances pit carburizing furnace, and furnace temperature drops to 760 ℃, is warming up to 910-930 ℃ again.(2) exhaust, furnace temperature exhaust when 760 ℃ are raised to 910-930 ℃, evacuation time is 60 minutes; Exhaust phase splashes into 120 droplets/minute of methyl alcohol, to temperature back setting-out, and splashes into 180 droplets/minute of kerosene; Set up carbon potential rapidly, can close sample aperture when carbon potential reaches 0.8-0.9 in stove.(3) ooze by force, the setting carbon potential is 1.1-1.2, kerosene drip the amount of releasing by the carbon potential appearance by setting automatic control of carbon potential, 80 droplets/minute of methyl alcohol; Can sample to setting behind the carbon potential 10 hours, the carburized depth of sampling reaches when 2/3 of the product requirement degree of depth is 1.34-1.68mm can transfer diffusion phase to.(4) diffusion, settings carbon potential is 0.8-0.9, kerosene drip the amount of releasing by the carbon potential appearance by the setting automatic control of carbon potential, kerosene is controlled by the carbon potential appearance automatically, 80 droplets/minute of methyl alcohol; Spread and can sample after 10 hours, when case depth reaches 2.0-2.5mm, cooling.(5) cooling is come out of the stove, and design temperature is 860-870 ℃, and is incubated 40 minutes, and it is air-cooled to come out of the stove.(6) high tempering, design temperature are 650-670 ℃, are incubated 3 hours, splash into a small amount of kerosene to reduce the oxidation and decarbonization phenomenon of part, the air cooling of coming out of the stove behind the 820-830 ℃ of high tempering.(7) quench, design temperature is 820-830 ℃, splashes into a small amount of kerosene to reduce the oxidation and decarbonization phenomenon of part, the oil cooling of coming out of the stove after the insulation.(8) low-temperaturetempering, design temperature are 170-190 ℃, are incubated 6 hours, the air cooling of coming out of the stove.
Embodiment two: material is the carburizing quenching process of the diesel engine roller of 18CrNiMo7-6, quench-hardened case 3.3-4.1mm, cementation zone 3.5-4.3mm.Except the setting carbon potential of step (4) diffusion and embodiment one were inequality, all the other steps were identical with embodiment one, and the setting carbon potential that present embodiment step (4) spreads is 0.7-0.8.
Except that the foregoing description, the present invention can also have other embodiments, and all employings are equal to the technical scheme of replacement or equivalent transformation formation, all drop on the protection domain of requirement of the present invention.
Claims (2)
1. a low-carbon alloy steel part carburizing quenching process is characterized in that, may further comprise the steps:
(1) advance stove, furnace temperature is in the time of 910-930 ℃, and part advances pit carburizing furnace, and furnace temperature drops to 760 ℃, is warming up to 910-930 ℃ again;
(2) exhaust, furnace temperature exhaust when 760 ℃ are raised to 910-930 ℃, evacuation time is 60 minutes; Exhaust phase splashes into 120 droplets/minute of methyl alcohol, to temperature back setting-out, and splashes into 180 droplets/minute of kerosene; Set up carbon potential rapidly, can close sample aperture when carbon potential reaches 0.8-0.9 in stove;
(3) ooze by force, the setting carbon potential is 1.1-1.2, kerosene drip the amount of releasing by the carbon potential appearance by setting automatic control of carbon potential, 80 droplets/minute of methyl alcohol; Can sample to setting behind the carbon potential 10 hours, the carburized depth of sampling reaches 2/3 o'clock of the processing requirement degree of depth can transfer diffusion phase to;
(4) diffusion, settings carbon potential is 0.8-0.9, kerosene drip the amount of releasing by the carbon potential appearance by the setting automatic control of carbon potential, kerosene is controlled by the carbon potential appearance automatically, 80 droplets/minute of methyl alcohol; Spread and can sample after 10 hours, when case depth reaches 2.0-2.5mm, cooling;
(5) cooling is come out of the stove, and design temperature is 860-870 ℃, and is incubated 40 minutes, and it is air-cooled to come out of the stove;
(6) high tempering, design temperature are 650-670 ℃, are incubated 3 hours, splash into a small amount of kerosene to reduce the oxidation and decarbonization phenomenon of part, the air cooling of coming out of the stove behind the 820-830 ℃ of high tempering;
(7) quench, design temperature is 820-830 ℃, splashes into a small amount of kerosene to reduce the oxidation and decarbonization phenomenon of part, the oil cooling of coming out of the stove after the insulation;
(8) low-temperaturetempering, design temperature are 170-190 ℃, are incubated 6 hours, the air cooling of coming out of the stove.
2. low-carbon alloy steel part carburizing quenching process as claimed in claim 1 is characterized in that the trade mark of said low-carbon alloy steel is 18CrNiMo7-6.
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Cited By (20)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103014595A (en) * | 2012-12-27 | 2013-04-03 | 金湖县常盛动力机械配件有限公司 | Carburizing method of low-carbon alloy steel |
| CN103710714A (en) * | 2012-12-07 | 2014-04-09 | 厦门真冈热处理有限公司 | Automobile gearbox gear carburizing and quenching heat treatment method |
| CN104357796A (en) * | 2014-11-24 | 2015-02-18 | 张家港保税区奇利国际贸易有限公司 | Carburizing and quenching process of automobile gear |
| CN104404443A (en) * | 2014-11-24 | 2015-03-11 | 张家港保税区奇利国际贸易有限公司 | Carburizing process for bearing part of wagon |
| CN105081692A (en) * | 2015-08-04 | 2015-11-25 | 南车戚墅堰机车有限公司 | Machining method for tapered strength structure of oil hole of piston pin of large-powder diesel engine |
| CN105108454A (en) * | 2015-08-19 | 2015-12-02 | 合肥市田源精铸有限公司 | Engine piston pin processing technology |
| CN107653433A (en) * | 2017-09-12 | 2018-02-02 | 厦门真冈热处理有限公司 | A kind of Technology for Heating Processing of automobile gimbal cross axle |
| CN108277449A (en) * | 2018-02-24 | 2018-07-13 | 湖南特科能热处理有限公司 | A kind of heat treatment method carrying out carburizing and quenching to low-carbon alloy steel workpiece |
| CN108411245A (en) * | 2018-05-03 | 2018-08-17 | 洛阳Lyc轴承有限公司 | A kind of G13Cr4Mo4Ni4V bearing rings carburization process |
| CN109047959A (en) * | 2018-07-26 | 2018-12-21 | 沈阳透平机械股份有限公司 | A kind of processing method of connecting rod special-shaped groove workpiece |
| CN109338275A (en) * | 2018-11-09 | 2019-02-15 | 常州天山重工机械有限公司 | A kind of middle-size and small-size cylinder body carburizing multistage quenching technical of 18CrNiMo7-6 steel |
| CN109609867A (en) * | 2018-11-05 | 2019-04-12 | 南京中船绿洲机器有限公司 | A kind of 18CrNiMo7-6 material and its low-temperature impact heat treatment method |
| CN111962012A (en) * | 2020-09-01 | 2020-11-20 | 天津创真金属科技有限公司 | High-temperature carburization slow-cooling quenching tempering heat treatment method for engineering machinery crawler belt pin bush |
| CN112008340A (en) * | 2020-08-25 | 2020-12-01 | 湖北中油科昊机械制造有限公司 | Method and device for processing valve seat |
| CN112593183A (en) * | 2020-10-26 | 2021-04-02 | 江苏聚源电气有限公司 | Heat treatment method for carburizing and quenching |
| CN113322428A (en) * | 2021-05-26 | 2021-08-31 | 盐城市金洲机械制造有限公司 | Heat treatment method for gear of speed reducer |
| CN113481463A (en) * | 2021-01-26 | 2021-10-08 | 长沙超金刚机械制造有限公司 | Heat treatment process of piston |
| CN114214589A (en) * | 2021-12-17 | 2022-03-22 | 大连长丰实业总公司 | Carburizing method suitable for drop-feed gas carburizing furnace |
| CN114410933A (en) * | 2022-01-24 | 2022-04-29 | 重庆大学 | Carburized layer depth increasing method based on pre-shot blasting |
| CN117802446A (en) * | 2024-03-01 | 2024-04-02 | 山东天瑞重工有限公司 | Heat treatment process method of low-carbon high-alloy structural steel and hydraulic breaking hammer piston |
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| CN1721558A (en) * | 2004-07-16 | 2006-01-18 | 万向钱潮股份有限公司 | Carburizing and quenching process for cold extrusion steel |
| CN101775571A (en) * | 2010-02-03 | 2010-07-14 | 广州柴油机厂 | Process for producing large-scale diesel engine cam workpiece with high hardness and abrasive resistance |
| CN102383136A (en) * | 2011-11-17 | 2012-03-21 | 江西电力职业技术学院 | Heat treatment process for steel of transmission line tower |
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| CN103710714B (en) * | 2012-12-07 | 2016-02-03 | 厦门真冈热处理有限公司 | The heat treating method of automobile gearbox gear carburizing and quenching |
| CN103710714A (en) * | 2012-12-07 | 2014-04-09 | 厦门真冈热处理有限公司 | Automobile gearbox gear carburizing and quenching heat treatment method |
| CN103014595B (en) * | 2012-12-27 | 2014-11-26 | 金湖县常盛动力机械配件有限公司 | Carburizing method of low-carbon alloy steel |
| CN103014595A (en) * | 2012-12-27 | 2013-04-03 | 金湖县常盛动力机械配件有限公司 | Carburizing method of low-carbon alloy steel |
| CN104357796A (en) * | 2014-11-24 | 2015-02-18 | 张家港保税区奇利国际贸易有限公司 | Carburizing and quenching process of automobile gear |
| CN104404443A (en) * | 2014-11-24 | 2015-03-11 | 张家港保税区奇利国际贸易有限公司 | Carburizing process for bearing part of wagon |
| CN104357796B (en) * | 2014-11-24 | 2016-11-23 | 烟台智本知识产权运营管理有限公司 | The carburizing quenching process of automobile gear |
| CN105081692B (en) * | 2015-08-04 | 2017-07-11 | 南车戚墅堰机车有限公司 | A kind of processing method of the gradual change type strength structure of piston of high power diesel engine pin oilhole |
| CN105081692A (en) * | 2015-08-04 | 2015-11-25 | 南车戚墅堰机车有限公司 | Machining method for tapered strength structure of oil hole of piston pin of large-powder diesel engine |
| CN105108454A (en) * | 2015-08-19 | 2015-12-02 | 合肥市田源精铸有限公司 | Engine piston pin processing technology |
| CN107653433A (en) * | 2017-09-12 | 2018-02-02 | 厦门真冈热处理有限公司 | A kind of Technology for Heating Processing of automobile gimbal cross axle |
| CN108277449B (en) * | 2018-02-24 | 2020-02-11 | 湖南特科能热处理有限公司 | Heat treatment method for carburizing and quenching low-carbon alloy steel workpiece |
| CN108277449A (en) * | 2018-02-24 | 2018-07-13 | 湖南特科能热处理有限公司 | A kind of heat treatment method carrying out carburizing and quenching to low-carbon alloy steel workpiece |
| CN108411245A (en) * | 2018-05-03 | 2018-08-17 | 洛阳Lyc轴承有限公司 | A kind of G13Cr4Mo4Ni4V bearing rings carburization process |
| CN109047959A (en) * | 2018-07-26 | 2018-12-21 | 沈阳透平机械股份有限公司 | A kind of processing method of connecting rod special-shaped groove workpiece |
| CN109609867A (en) * | 2018-11-05 | 2019-04-12 | 南京中船绿洲机器有限公司 | A kind of 18CrNiMo7-6 material and its low-temperature impact heat treatment method |
| CN109338275A (en) * | 2018-11-09 | 2019-02-15 | 常州天山重工机械有限公司 | A kind of middle-size and small-size cylinder body carburizing multistage quenching technical of 18CrNiMo7-6 steel |
| CN112008340A (en) * | 2020-08-25 | 2020-12-01 | 湖北中油科昊机械制造有限公司 | Method and device for processing valve seat |
| CN111962012A (en) * | 2020-09-01 | 2020-11-20 | 天津创真金属科技有限公司 | High-temperature carburization slow-cooling quenching tempering heat treatment method for engineering machinery crawler belt pin bush |
| CN112593183A (en) * | 2020-10-26 | 2021-04-02 | 江苏聚源电气有限公司 | Heat treatment method for carburizing and quenching |
| CN113481463A (en) * | 2021-01-26 | 2021-10-08 | 长沙超金刚机械制造有限公司 | Heat treatment process of piston |
| CN113322428A (en) * | 2021-05-26 | 2021-08-31 | 盐城市金洲机械制造有限公司 | Heat treatment method for gear of speed reducer |
| CN114214589A (en) * | 2021-12-17 | 2022-03-22 | 大连长丰实业总公司 | Carburizing method suitable for drop-feed gas carburizing furnace |
| CN114410933A (en) * | 2022-01-24 | 2022-04-29 | 重庆大学 | Carburized layer depth increasing method based on pre-shot blasting |
| CN114410933B (en) * | 2022-01-24 | 2022-12-09 | 重庆大学 | Carburized layer depth increasing method based on pre-shot blasting |
| CN117802446A (en) * | 2024-03-01 | 2024-04-02 | 山东天瑞重工有限公司 | Heat treatment process method of low-carbon high-alloy structural steel and hydraulic breaking hammer piston |
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Application publication date: 20121114 |