CN1721558A - Carburizing and quenching process for cold extrusion steel - Google Patents
Carburizing and quenching process for cold extrusion steel Download PDFInfo
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- CN1721558A CN1721558A CN 200410052965 CN200410052965A CN1721558A CN 1721558 A CN1721558 A CN 1721558A CN 200410052965 CN200410052965 CN 200410052965 CN 200410052965 A CN200410052965 A CN 200410052965A CN 1721558 A CN1721558 A CN 1721558A
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Abstract
The present invention is one kind of carbonizing and quenching heat treatment process for cold extruded steel. The present invention features the technological conditions including feeding temperature of 950-990 deg.c; pre-heating rate of 30-50 deg.c/min; heating and maintaining temperature of 920-980 deg.c; forced carbonizing maintaining time of 3-11 hr; diffusion maintaining time of 2-9 hr; temperature lowering rate of 30-60 deg.c/hr; quenching temperature of 820-880 deg.c; forced carbonizing carbon potential of 0.95-1.2 C%; and diffusion carbon potential of 0.7-0.9 C%. The technological process is simple and low in cost, and can obtain metallographic structure finer than grade-5. The treated steel possesses raised impact toughness, breaking toughness, plasticity, tensile strength, torque strength, etc.
Description
Technical field
The present invention relates to a kind of thermal treatment of steel, particularly relate to a kind of carburizing and quenching thermal treatment process of cold-extruded steel.
Background technology
The existence of steel coarse-grain (metallographic structure is coarser than 4 grades (grain fineness numbers)) generally can produce adverse influence to mechanical property, and impelling strength, fracture toughness property and the plasticity of steel are reduced, and may reduce the tensile strength of material in addition in addition, the quiet intensity etc. of turning round.All think at present: behind the steel cold-extruded, as long as the deflection of steel reaches the critical strain amount, when Heating temperature is higher than the deformation recrystallization temperature (general about 600 ℃) of steel, no matter take what measure, crystal grain all will be grown up unusually; And be that Heating temperature is high more, crystal grain is thick more.At present some traditional heat treating methods all adopt one to quench again to secondary.
The diphasic fever treatment process (patent No.: patent application 88104276) as a kind of low-carbon and low-alloy steel by name, it is that induction quenching and contact electricity heating quenching heat treating method are used for the two-phase region quenching heat treatment that the low-carbon low-alloy steel steel carry out successive or integral body, to obtain the two-phase steel with fine crystal grain material of ferrite and martensite duplex structure.But secondary quenching heat treatment technology again exists the comparatively complicated and cost of technology than problems such as height.
Summary of the invention
The invention solves the existing in prior technology secondary again quenching heat treatment technology exist the comparatively complicated and cost of technology than problems such as height, provide a kind of technology comparatively simple, cost is lower, just can obtain being narrower than 5 grades of (grain fineness number) metallographic structures after the cold-extruded steel carburizing direct quenching, steel impelling strength, fracture toughness property and plasticity after the processing are higher, tensile strength and the quiet intensity cold-extruded steel carburizing quenching process preferably of turning round.
For solving above-mentioned technical purpose, the carburizing quenching process of cold-extruded steel disclosed by the invention comprises: 1) advance 950 ℃-990 ℃ of furnace temperatures; 2) rate of heating is 30 ℃/minute-50 ℃/minute; 3) the heat tracing temperature is 920 ℃-980 ℃; 4) ooze soaking time 3-11 hour by force; 5) the diffusion soaking time is 2-9 hour; 6) 30 ℃/time-60 of cooling rate ℃/hour; 7) quenching temperature is 820 ℃-880 ℃; 8) strong carburizing gesture is 0.95-1.2C%; 9) the diffusion carbon potential is 0.7-0.9C%.Wherein, advance furnace temperature and refer to that workpiece puts into the stove temperature before the body of heater; The heat tracing temperature refer to workpiece put into body of heater with normal temperature after workpiece heated the holding temperature that is reached.The rate of heating that provides with technical solution of the present invention heats steel, crystal grain grows up unusually in the time of stoping steel to work as Heating temperature to be higher than the deformation recrystallization temperature of steel, eliminate the detrimentally affect that coarse-grain brings, control or suppress macrocrystalline formation, make the metallographic structure that just can obtain being narrower than 5 grades (grain fineness numbers) after the cold-extruded steel carburizing direct quenching, technology is comparatively simple, has reduced tooling cost.
As preferably, described to advance furnace temperature be 950 ℃-980 ℃; Described rate of heating is 30 ℃/minute-45 ℃/minute; Described heat tracing temperature is 930 ℃-960 ℃; The described soaking time of oozing by force is 5-9 hour; Described diffusion soaking time is 3-7 hour; Described cooling rate is 40 ℃/time-50 ℃/hour; 840 ℃-860 ℃ of described quenching temperatures; Described strong carburizing gesture is 0.95-1.05C%; Described diffusion carbon potential is 0.75-0.85C%.
Therefore, it is comparatively simple that the present invention has technology, and cost is lower, just can obtain being narrower than 5 grades of (grain fineness number) metallographic structures after the cold-extruded steel carburizing direct quenching, steel impelling strength, fracture toughness property and plasticity after the processing are higher, tensile strength and quietly turn round characteristics such as intensity is better.The rate of heating that provides with technical solution of the present invention heats steel, crystal grain grows up unusually in the time of stoping steel to work as Heating temperature to be higher than the deformation recrystallization temperature of steel, eliminate the detrimentally affect that coarse-grain brings, control or suppress macrocrystalline formation, make the metallographic structure that just can obtain being narrower than 5 grades (grain fineness numbers) after the cold-extruded steel carburizing direct quenching, technology is comparatively simple, has reduced tooling cost.
Description of drawings
Accompanying drawing 1 is a cold-extruded deformation photomacrograph of the present invention, and middle is the critical strain district;
Accompanying drawing 2 is a kind of distorted area metallographs (150 *);
Accompanying drawing 3 is another kind of distorted area metallographs (150 *);
Accompanying drawing 4 is former carburizing quenching process photomacrographs, and the centre is the district of growing up unusually;
Accompanying drawing 5 be former carburizing direct quenching process abnormality grow up the district metallograph (1000 *);
Accompanying drawing 6 is carburizing quenching process photomacrographs of the present invention;
Accompanying drawing 7 be carburizing quenching process of the present invention grow up unusually the district metallograph (1000 *).
Embodiment
Below by specific embodiment, and in conjunction with the accompanying drawings, technical scheme of the present invention is described in further detail.
Embodiment 1: it is 950 ℃ gas carbruizing furance that the workpiece that the cold-extruded steel are made is put into the stove temperature, with 40 ℃/minute rate of heating workpiece is heated to 950 ℃, strong carburizing gesture is 0.95C%, insulation is after 5 hours in stove, carbon potential is reduced to 0.8C%, insulation after 5 hours in stove is again adopted the machine oil quench treatment after being cooled to 850 ℃ with 45 ℃/hour speed, can obtain being narrower than 5 grades of (grain fineness number) metallographic structures (as shown in Figure 6 and Figure 7).
Embodiment 2: it is 970 ℃ gas carbruizing furance that the workpiece that the cold-extruded steel are made is put into the stove temperature, with 30 ℃/minute rate of heating workpiece is heated to 940 ℃, strong carburizing gesture is 1.05C%, insulation is after 3 hours in stove, carbon potential is reduced to 0.75C%, insulation is adopted the machine oil quench treatment after being cooled to 820 ℃ with 30 ℃/hour speed after 2 hours in stove again, can obtain being narrower than 5 grades of (grain fineness number) metallographic structures (as shown in Figure 6 and Figure 7).
Embodiment 3: it is 990 ℃ gas carbruizing furance that the workpiece that the cold-extruded steel are made is put into the stove temperature, with 50 ℃/minute rate of heating workpiece is heated to 930 ℃, strong carburizing gesture is 1.1C%, insulation is after 10 hours in stove, carbon potential is reduced to 0.8C%, insulation is adopted the machine oil quench treatment after being cooled to 880 ℃ with 60 ℃/hour speed after 8 hours in stove again, can obtain being narrower than 5 grades of (grain fineness number) metallographic structures (as shown in Figure 6 and Figure 7).
Embodiment 4: it is 960 ℃ gas carbruizing furance that the workpiece that the cold-extruded steel are made is put into the stove temperature, with 35 ℃/minute rate of heating workpiece is heated to 940 ℃, strong carburizing gesture is 0.95C%, insulation is after 4 hours in stove, carbon potential is reduced to 0.8C%, insulation is adopted the machine oil quench treatment after being cooled to 840 ℃ with 40 ℃/hour speed after 3 hours in stove again, can obtain being narrower than 5 grades of (grain fineness number) metallographic structures (as shown in Figure 6 and Figure 7).
Embodiment 5: it is 980 ℃ gas carbruizing furance that the workpiece that the cold-extruded steel are made is put into the stove temperature, with 45 ℃/minute rate of heating workpiece is heated to 925 ℃, strong carburizing gesture is 1.0C%, insulation is after 7 hours in stove, carbon potential is reduced to 0.85C%, insulation after 5 hours in stove is again adopted the machine oil quench treatment after being cooled to 860 ℃ with 50 ℃/hour speed, can obtain being narrower than 5 grades of (grain fineness number) metallographic structures (as shown in Figure 6 and Figure 7).
Embodiment 6: it is 980 ℃ gas carbruizing furance that the workpiece that the cold-extruded steel are made is put into the stove temperature, with 30 ℃/minute rate of heating workpiece is heated to 920 ℃, strong carburizing gesture is 1.2C%, insulation is after 11 hours in stove, carbon potential is reduced to 0.7C%, insulation after 9 hours in stove is again adopted the machine oil quench treatment after being cooled to 860 ℃ with 50 ℃/hour speed, can obtain being narrower than 5 grades of (grain fineness number) metallographic structures (as shown in Figure 6 and Figure 7).
Embodiment 7: it is 980 ℃ gas carbruizing furance that the workpiece that the cold-extruded steel are made is put into the stove temperature, with 45 ℃/minute rate of heating workpiece is heated to 960 ℃, strong carburizing gesture is 1.0C%, insulation is after 9 hours in stove, carbon potential is reduced to 0.9C%, insulation after 5 hours in stove is again adopted the machine oil quench treatment after being cooled to 860 ℃ with 60 ℃/hour speed, can obtain being narrower than 5 grades of (grain fineness number) metallographic structures (as shown in Figure 6 and Figure 7).
Claims (10)
1, a kind of carburizing quenching process of cold-extruded steel is characterized in that: 1) advance 950 ℃-990 ℃ of furnace temperatures; 2) rate of heating is 30 ℃/minute-50 ℃/minute; 3) the heat tracing temperature is 920 ℃-980 ℃; 4) ooze soaking time 3-11 hour by force; 5) the diffusion soaking time is 2-9 hour; 6) 30 ℃/time-60 of cooling rate ℃/hour; 7) quenching temperature is 820 ℃-880 ℃; 8) strong carburizing gesture is 0.95-1.2C%; 9) the diffusion carbon potential is 0.7-0.9C%.
2, the carburizing quenching process of a kind of cold-extruded steel according to claim 1 is characterized in that described to advance furnace temperature be 950 ℃-980 ℃.
3, the carburizing quenching process of a kind of cold-extruded steel according to claim 1 and 2 is characterized in that described rate of heating is 30 ℃/minute-45 ℃/minute.
4, the carburizing quenching process of a kind of cold-extruded steel according to claim 1 and 2 is characterized in that described heat tracing temperature is 930 ℃-960 ℃.
5, the carburizing quenching process of a kind of cold-extruded steel according to claim 1 and 2 is characterized in that the described soaking time of oozing by force is 5-9 hour.
6, the carburizing quenching process of a kind of cold-extruded steel according to claim 1 and 2 is characterized in that described diffusion soaking time is 3-7 hour.
7, the carburizing quenching process of a kind of cold-extruded steel according to claim 1 and 2 is characterized in that described cooling rate is 40 ℃/time-50 ℃/hour.
8, the carburizing quenching process of a kind of cold-extruded steel according to claim 1 and 2 is characterized in that 840 ℃-860 ℃ of described quenching temperatures.
9, the carburizing quenching process of a kind of cold-extruded steel according to claim 1 and 2 is characterized in that described strong carburizing gesture is 0.95-1.05C%.
10, the carburizing quenching process of a kind of cold-extruded steel according to claim 1 and 2 is characterized in that described diffusion carbon potential is 0.75-0.85C%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100529651A CN100371466C (en) | 2004-07-16 | 2004-07-16 | Carburizing and quenching process for cold extrusion steel |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100529651A CN100371466C (en) | 2004-07-16 | 2004-07-16 | Carburizing and quenching process for cold extrusion steel |
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| CN1721558A true CN1721558A (en) | 2006-01-18 |
| CN100371466C CN100371466C (en) | 2008-02-27 |
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| CNB2004100529651A Expired - Fee Related CN100371466C (en) | 2004-07-16 | 2004-07-16 | Carburizing and quenching process for cold extrusion steel |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100447417C (en) * | 2007-09-07 | 2008-12-31 | 无锡鹰贝机械有限公司 | Production process of high-purity plunger piston |
| CN101768717A (en) * | 2008-12-31 | 2010-07-07 | 北京南口轨道交通机械有限责任公司 | Surface treatment method of gear |
| CN102392260A (en) * | 2011-10-11 | 2012-03-28 | 天津市祥威传动设备有限公司 | Carburizing direct quenching process for large-scale wind power gear/gear shaft |
| CN102776471A (en) * | 2012-07-10 | 2012-11-14 | 镇江中船设备有限公司 | Carburizing quenching technology for low-carbon alloy steel parts |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1498983A (en) * | 2002-11-04 | 2004-05-26 | 沪东重机股份有限公司 | Method of carburizing and quenching cam of diesel engine in low speed |
-
2004
- 2004-07-16 CN CNB2004100529651A patent/CN100371466C/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100447417C (en) * | 2007-09-07 | 2008-12-31 | 无锡鹰贝机械有限公司 | Production process of high-purity plunger piston |
| CN101768717A (en) * | 2008-12-31 | 2010-07-07 | 北京南口轨道交通机械有限责任公司 | Surface treatment method of gear |
| CN101768717B (en) * | 2008-12-31 | 2013-09-25 | 北京南口轨道交通机械有限责任公司 | Surface treatment method of gear |
| CN102392260A (en) * | 2011-10-11 | 2012-03-28 | 天津市祥威传动设备有限公司 | Carburizing direct quenching process for large-scale wind power gear/gear shaft |
| CN102776471A (en) * | 2012-07-10 | 2012-11-14 | 镇江中船设备有限公司 | Carburizing quenching technology for low-carbon alloy steel parts |
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| Publication number | Publication date |
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| CN100371466C (en) | 2008-02-27 |
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Assignee: Xuchang wanxiangqianchao Esprit Far East Limited Assignor: Wangxiang Qianchao Co., Ltd. Contract fulfillment period: 2009.3.31 to 2014.3.31 Contract record no.: 2009410000061 Denomination of invention: Carburizing and quenching process for cold extrusion steel Granted publication date: 20080227 License type: Exclusive license Record date: 20090420 |
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Free format text: EXCLUSIVE LICENSE; TIME LIMIT OF IMPLEMENTING CONTACT: 2009.3.31 TO 2014.3.31; CHANGE OF CONTRACT Name of requester: XUCHANG WANXIANGQIANCHAO FAR EAST CO., LTD. Effective date: 20090420 |
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