CN102676754A - Process of quenching and tempering medium carbon steel with high carbon content - Google Patents
Process of quenching and tempering medium carbon steel with high carbon content Download PDFInfo
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- CN102676754A CN102676754A CN2011104457169A CN201110445716A CN102676754A CN 102676754 A CN102676754 A CN 102676754A CN 2011104457169 A CN2011104457169 A CN 2011104457169A CN 201110445716 A CN201110445716 A CN 201110445716A CN 102676754 A CN102676754 A CN 102676754A
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Abstract
The invention discloses a process for quenching and tempering medium carbon steel with high carbon content. The process comprises the following steps: (1) heating a workpiece in a quenching furnace to 840DEG C, keeping the temperature for sufficient time, discharging, and preparing for quenching; (2) determining a concentration range of a water soluble quenching liquid for the medium carbon steel by analyzing the chemical compositions and mechanical properties of the medium carbon steel; (3) according to the analysis on the concentration range, determining that the water soluble quenching liquid comprises 9.5 to 10 weight parts of water soluble quenching liquid stock solution and 90.5 to 89.5 weight parts of water, and ensuring that the temperature of the water soluble quenching liquid is 20-40DEG C; (4) starting a stirring motor for uniform stirring, and controlling a rotation speed at 25-35r/min; (5) only controlling the speed of a conveyor chain plate at the bottom of a quenching tank according to the water soluble quenching liquid, and ensuring that the temperature of the workpiece after cooling and water emission is lower than 200DEG C; and (6) tempering the workpiece subjected to quenching in the step (5) in a tempering furnace at the temperature of between 530 and 550DEG C. A water-base medium is adopted, the quenching cost is greatly reduced, the cooling speed is improved, and the medium carbon steel can well meet the requirements on metallographic structure and hardness of products.
Description
Technical field
The present invention relates to a kind of modifier treatment technology, belong to the metal heat treatmet technical field to the higher medium carbon steel of carbon content.
Background technology
Modifier treatment is to increase temperature the tempered heat treating method through quenching, and the performance of steel is adjusted significantly, reaches required intensity, plasticity and toughness, obtains good comprehensive mechanical performance.For the higher medium carbon steel of carbon content (carbon content is more than 0.45%), what domestic manufacturer mainly adopted at present is the oils quench method.The oils quench method can reduce the quenching stress of workpiece, prevent workpiece deformation and cracking, but cooling power is relatively poor, and full hardening deepness is little, and the tempering oil cost is higher, and in use easy catching fire produces oil smoke and disaster hidden-trouble.
Summary of the invention
Deficiency to the prior art existence; Technical problem to be solved by this invention is; Provide that a kind of to solve the cooling power that prior art exists poor, full hardening deepness is little, and the tempering oil cost is higher; In use easy catching fire, the higher medium carbon steel modifier treatment technology of carbon content of the problem of generation oil smoke and disaster hidden-trouble.
For solving the problems of the technologies described above, the technical scheme that the present invention taked is: the medium carbon steel modifier treatment technology that a kind of carbon content is higher, it comprises the following steps:
(1), workpiece discharging after quenching furnance internal heating insulation to the enough time, prepare to quench;
(2), the concentration range through the water-soluble quenching liquid that medium carbon steel adopts is confirmed in the chemical ingredients and the mechanical property analysis of mild steel material;
(3), according to the analysis of above-mentioned concentration range, water-soluble quenching liquid concentration is 90.5～89.5 parts of water of 9.5～10.5 parts of former liquor ratios of water-soluble quenching liquid by weight ratio, the water-soluble quenching liquid temperature is 20 ℃～40 ℃;
(4), open agitator motor, evenly stir, rotating speed is controlled at 25r/min～35r/min;
(5), control quenching bath bottom only according to water-soluble quenching liquid and transmit carrier bar speed, guarantee the work-piece cools water outlet after temperature less than 200 ℃;
(6), the middle workpiece that quenches after finishing of step (5) is advanced tempering stove and carry out tempering, 530 ℃～550 ℃ of tempering temperatures.
The medium carbon steel modifier treatment technology that above-mentioned carbon content is higher, said agitator motor rotating speed is 30r/min.
The medium carbon steel modifier treatment technology that above-mentioned carbon content is higher, 30 ℃ of said water-soluble quenching liquid temperature.
The medium carbon steel modifier treatment technology that above-mentioned carbon content is higher, 540 ℃ of said tempering temperatures.
The advantage of the medium carbon steel modifier treatment technology that carbon content of the present invention is higher is: adopt aqueous medium, greatly reduce the expense of quenchant, and improved speed of cooling, cooling power is strong, can better reach required metallographic structure of product and hardness requirement; Can be through parameters such as control hardening liquid concentration 9.5%～10.5%, stirring velocity 25r/min～35r/min, 20 ℃～40 ℃ of quench fluid temperatures, transmission carrier bar speed; Realize the modified demand of carbon content at the higher medium carbon steel product of the carbon content of 0.45--0.60%; And the oils quench method is changed the tempering oil of different varieties often according to the product of unlike material; Do not burn nontoxic no oil smoke, environmentally safe in the use fully.
Embodiment
Below in conjunction with specific embodiment the present invention is explained further details;
Embodiment 1:
The medium carbon steel modifier treatment technology that a kind of carbon content is higher, it comprises the following steps:
(1), workpiece is at quenching furnance internal heating to 840 ℃, discharging after insulation to the enough time prepares to quench;
(2), the concentration range through the water-soluble quenching liquid that medium carbon steel adopts is confirmed in the chemical ingredients and the mechanical property analysis of mild steel material;
(3), according to the analysis of above-mentioned concentration range, water-soluble quenching liquid concentration is 90.5 parts of water of 9.5 parts of former liquor ratios of water-soluble quenching liquid by weight ratio, the water-soluble quenching liquid temperature is 20 ℃;
(4), open agitator motor, evenly stir, rotating speed is controlled at 25r/min;
(5), control quenching bath bottom only according to water-soluble quenching liquid and transmit carrier bar speed, guarantee after the work-piece cools water outlet 120 ℃ of temperature;
(6), the middle workpiece that quenches after finishing of step (5) is advanced tempering stove and carry out tempering, 530 ℃ of tempering temperatures.
Used water-soluble quenching liquid stoste is PAG stoste in the step 3, and its chemical name is: polyalkylene glycol.
Embodiment 2:
The medium carbon steel modifier treatment technology that a kind of carbon content is higher, it comprises the following steps:
(1), workpiece is at quenching furnance internal heating to 840 ℃, discharging after insulation to the enough time prepares to quench;
(2), the concentration range through the water-soluble quenching liquid that medium carbon steel adopts is confirmed in the chemical ingredients and the mechanical property analysis of mild steel material;
(3), according to the analysis of above-mentioned concentration range, water-soluble quenching liquid concentration is 90 parts of water of 10 parts of former liquor ratios of water-soluble quenching liquid by weight ratio, the water-soluble quenching liquid temperature is 30 ℃;
(4), open agitator motor, evenly stir, rotating speed is controlled at 30r/min;
(5), control quenching bath bottom only according to water-soluble quenching liquid and transmit carrier bar speed, guarantee after the work-piece cools water outlet 160 ℃ of temperature;
(6), the middle workpiece that quenches after finishing of step (5) is advanced tempering stove and carry out tempering, 540 ℃ of tempering temperatures.
Embodiment 3:
(1), workpiece is at quenching furnance internal heating to 840 ℃, discharging after insulation to the enough time prepares to quench;
(2), the concentration range through the water-soluble quenching liquid that medium carbon steel adopts is confirmed in the chemical ingredients and the mechanical property analysis of mild steel material;
(3), according to the analysis of above-mentioned concentration range, water-soluble quenching liquid concentration is 89.5 parts of water of 10.5 parts of former liquor ratios of water-soluble quenching liquid by weight ratio, the water-soluble quenching liquid temperature is 40 ℃;
(4), open agitator motor, evenly stir, rotating speed is controlled at 35r/min;
(5), control quenching bath bottom only according to water-soluble quenching liquid and transmit carrier bar speed, guarantee after the work-piece cools water outlet 180 ℃ of temperature;
(6), the middle workpiece that quenches after finishing of step (5) is advanced tempering stove and carry out tempering, 550 ℃ of tempering temperatures.
Certainly, above-mentioned explanation is not to be limitation of the present invention, and the present invention also is not limited to above-mentioned giving an example; Those skilled in the art; In essential scope of the present invention, the variation of making, remodeling, interpolation or replacement all should belong to protection scope of the present invention.
Claims (4)
1. medium carbon steel modifier treatment technology that carbon content is higher, it comprises the following steps:
(1), workpiece is at quenching furnance internal heating to 840 ℃, discharging after insulation to the enough time prepares to quench;
(2), the concentration range through the water-soluble quenching liquid that medium carbon steel adopts is confirmed in the chemical ingredients and the mechanical property analysis of mild steel material;
(3), according to the analysis of above-mentioned concentration range, water-soluble quenching liquid concentration is 90.5～89.5 parts of water of 9.5～10.5 parts of former liquor ratios of water-soluble quenching liquid by weight ratio, the water-soluble quenching liquid temperature is 20 ℃～40 ℃;
(4), open agitator motor, evenly stir, rotating speed is controlled at 25r/min～35r/min;
(5), control quenching bath bottom only according to water-soluble quenching liquid and transmit carrier bar speed, guarantee the work-piece cools water outlet after temperature less than 200 ℃;
(6), the middle workpiece that quenches after finishing of step (5) is advanced tempering stove and carry out tempering, 530 ℃～550 ℃ of tempering temperatures.
2. the medium carbon steel modifier treatment technology that carbon content according to claim 1 is higher is characterized in that: said agitator motor rotating speed is 30r/min.
3. the medium carbon steel modifier treatment technology that carbon content according to claim 1 is higher is characterized in that: 30 ℃ of said water-soluble quenching liquid temperature.
4. the medium carbon steel modifier treatment technology that carbon content according to claim 1 is higher is characterized in that: 540 ℃ of said tempering temperatures.
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| CN2011104457169A CN102676754A (en) | 2011-11-29 | 2011-11-29 | Process of quenching and tempering medium carbon steel with high carbon content |
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| CN2011104457169A CN102676754A (en) | 2011-11-29 | 2011-11-29 | Process of quenching and tempering medium carbon steel with high carbon content |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103498032A (en) * | 2013-09-23 | 2014-01-08 | 无锡阳工机械制造有限公司 | Quenching process of medium carbon alloy steel |
| CN114438305A (en) * | 2021-12-29 | 2022-05-06 | 通裕重工股份有限公司 | Application of PAG quenching liquid in wind power main shaft quenching and tempering process of more than 20t |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1018215A (en) * | 1963-12-10 | 1966-01-26 | Union Carbide Coporation | Improvements in and relating to metal quenching medium |
| CN101948947A (en) * | 2010-09-08 | 2011-01-19 | 四川恒威活塞环有限公司 | Heat treatment technology of spheroidal graphite cast iron piston ring |
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2011
- 2011-11-29 CN CN2011104457169A patent/CN102676754A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1018215A (en) * | 1963-12-10 | 1966-01-26 | Union Carbide Coporation | Improvements in and relating to metal quenching medium |
| CN101948947A (en) * | 2010-09-08 | 2011-01-19 | 四川恒威活塞环有限公司 | Heat treatment technology of spheroidal graphite cast iron piston ring |
Non-Patent Citations (3)
| Title |
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| 冶金部信息标准研究院等: "《优质碳素结构钢（GB／T699—1999）》", 1 November 1999, 中国标准出版社 * |
| 唐殿福，卯时刚: "《钢的化学热处理》", 31 March 2009, 辽宁科学技术出版社 * |
| 张先鸣，冯琴: "PAG淬火液在紧固件热处理中的应用", 《金属制品》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103498032A (en) * | 2013-09-23 | 2014-01-08 | 无锡阳工机械制造有限公司 | Quenching process of medium carbon alloy steel |
| CN114438305A (en) * | 2021-12-29 | 2022-05-06 | 通裕重工股份有限公司 | Application of PAG quenching liquid in wind power main shaft quenching and tempering process of more than 20t |
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