CN103014595A - Carburizing method of low-carbon alloy steel - Google Patents
Carburizing method of low-carbon alloy steel Download PDFInfo
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- CN103014595A CN103014595A CN2012105773581A CN201210577358A CN103014595A CN 103014595 A CN103014595 A CN 103014595A CN 2012105773581 A CN2012105773581 A CN 2012105773581A CN 201210577358 A CN201210577358 A CN 201210577358A CN 103014595 A CN103014595 A CN 103014595A
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- carburizing
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Abstract
The invention discloses a carburizing method of low-carbon alloy steel. According to the method, through high-temperature deep seepage, the diffused carbon potential can be properly lowered, and the diffusion time can be prolonged, the time can be effectively shortened, the energy consumption can be reduced, and the carburized low-carbon alloy steel can meet the technical requirements.
Description
Technical field
The present invention relates to a kind of method for carburizing of low-carbon alloy steel, be specifically related to a kind of high temperature method of directly quenching.
Background technology
Low-carbon alloy steel is generally by carburization process, obtaining high surface hardness, high wear resistance and fatigue strength, and keeps heart section that obdurability after low-carbon alloy steel quenches is arranged, and makes the workpiece load that can withstand shocks.
In order to make metallographic structure reach specified requirement, warm direct quenching technology is carried out carburizing to low-carbon alloy steel in usually adopting, but middle temperature carburizing time is long, and energy consumption is large, and production capacity is on the low side.
Summary of the invention
To the objective of the invention is the defective that exists in the prior art in order solving, the carburizing tech that a kind of carburizing time is short, energy consumption is little to be provided.
In order to achieve the above object, the invention provides a kind of method for carburizing of low-carbon alloy steel, adopt multipurpose furnace to carry out carburizing, protective atmosphere adopts methyl alcohol, and carburizing medium adopts propane; May further comprise the steps:
(1) preparatory stage: low-carbon alloy steel is packed in the multipurpose furnace; Heat up, continue to pass into methyl alcohol; When temperature rises to 890～910 ℃, continue to pass into methyl alcohol, keep 10～15min and make uniformity of temperature profile in the multipurpose furnace, keeping simultaneously the reference gas flow rate pump is 80～150mL/min; The flow of methyl alcohol is 3～5mL/min;
(2) ooze the stage by force: keep temperature and reference gas flow rate pump in the multipurpose furnace, in multipurpose furnace, pass into propane and methyl alcohol, make the interior carbon potential of multipurpose furnace rise to 0.89～0.91%C, keep 70～75min to carry out carburizing; The flow of methyl alcohol is 3～5mL/min; The flow of propane is 6～8mL/min;
(3) diffusion phase: keep methyl alcohol and reference gas pumping capacity, temperature to 810 in the reduction multipurpose furnace～830 ℃ stops to pass into propane simultaneously; When carbon potential is down to 0.78～0.83%C in the multipurpose furnace, again pass into propane, keep carbon potential and temperature in the multipurpose furnace, spread 15-20min; The flow of propane is 6～8mL/min;
(4) the quenching stage: low-carbon alloy steel is taken out quenching, drain after the cooling and get final product; Quenchant adopts quenching oil.
Wherein, the interior temperature of multipurpose furnace rises to 900 ℃ in the step (1), keeps 15min and makes uniformity of temperature profile in the multipurpose furnace.
The interior carbon potential of multipurpose furnace rises to 0.9%C in the step (2), keeps 70min to carry out carburizing.
The interior temperature of multipurpose furnace is down to 820 ℃ in the step (3), and carbon potential is down to 0.80%C, spreads 15min.
Multipurpose furnace adopts BQC-600W sealed-box type nicarbing stove.
The present invention has the following advantages compared to existing technology:
1, high temperature carburizing is substituted in warm carburizing, can accelerate carbon in the carburizing medium, hydrogen decomposes cracking, increases carburizing speed, enhance productivity;
2, in the later stage diffusion phase, reduce carbon potential, product surface concentration is slightly reduced, simultaneously proper extension diffusion time, can form comparatively ideal eutectoid layer and hypoeutectoid layer, when quenching, avoid the product surface martensitic stucture thick, thereby satisfy technical requirements;
3, adopt warm carburization process in the tradition, every stove power consumption 237 degree, every stove power consumption 170 degree of the present invention, with furnace gauge calculation every days 4, year economize on electricity is 90000 degree approximately; Adopt simultaneously the traditional technology carburizing to need 2.5 hours consuming time, 1.8 hours consuming time of the present invention is with furnace gauge calculation every days 4, year saving 1000 hours; And by saving time, save approximately 100 yuan of the subsidiary material such as propane, methyl alcohol every day, year can be cut down expenses 30000 yuan.By reducing energy consumption, saving material, greatly reduce production cost.
Description of drawings
Fig. 1 is the surperficial metallographic structure figure of the low-carbon alloy steel after the carburizing among the embodiment one;
Fig. 2 is the metallographic structure figure of heart section of the low-carbon alloy steel after the carburizing among the embodiment one.
Embodiment
Be elaborated below in conjunction with the method for carburizing of specific embodiment to low-carbon alloy steel of the present invention.
Embodiment one
(1) preparatory stage:
Prepare before a, blow-on: multipurpose furnace open that sky oozes or the continuous carbonization EP (end of program) after, select " low-carbon alloy steel high temperature carburizing direct quenching technique " and oil cooling mode, advance stove and finish shove charge by auto-programming;
B, one section (intensification): design temperature (900 ℃) begins to heat up, and passes into methyl alcohol (4ml/min), adjusts atmosphere;
C, two sections (determining to temperature): furnace temperature rises to (900 ℃), set (5min), and the time wait, Flow-rate adjustment passes into methyl alcohol (4ml/min), and the benchmark air pump keeps (100ml/min);
D, three sections (samming): set (10min), soaking time makes uniformity of temperature profile in the stove, and Flow-rate adjustment passes into methyl alcohol (4ml/min), and the benchmark air pump keeps (100ml/min).
(2) ooze the stage by force:
E, four sections (carbon potential is determined): set carbon potential (0.9%C), Flow-rate adjustment passes into carburizing agent propane (7mL/min) simultaneously, methyl alcohol (4ml/min) makes the interior carbon potential of stove rise to gradually set(ting)value and decides 5S maintenance, benchmark air pump (100ml/min);
F, five sections (oozing the stage by force): begin timing after arriving the carbon potential set(ting)value in the stove, the time of oozing by force keeps (70min), this section temperature (900 ℃), carbon potential (0.90%C), benchmark air pump (100ml/min), propane and methyl alcohol flow keep constant among the e.
(3) diffusion phase:
G, six sections (cooling carbon drop gesture): design temperature (820 ℃), carbon potential (0.80%C), instrument control stops to pass into propane automatically, and the methyl alcohol flow remains unchanged, temperature and carbon potential are down to set(ting)value gradually in the benchmark air pump (100ml/min), stove;
H, seven sections (diffusion temperature and carbon potential are determined): set temperature (820 ℃) and (5min) time wait in the stove, while flow control propane (7ml/min), methyl alcohol (4ml/min), benchmark air pump (100ml/min);
I, eight sections (isothermal diffusion): temperature (820 ℃) in the stove, carbon potential (0.80%C) begins timing (10min) after finishing the setting wait, spread, benchmark air pump (100ml/min), propane (7mL/min), methyl alcohol (4ml/min).
(4) the quenching stage:
J, nine sections (quenching of coming out of the stove): set and come out of the stove, keep temperature in the stove, carbon potential, furnace pressure, in the constant situation of propane and methyl alcohol flow, automatically open fire door behind the signal prompt and pull out the oil of quenching, cooling drains after (30 minutes), namely gets the low-carbon alloy steel after the carburizing.
Embodiment two
(1) preparatory stage:
Prepare before a, blow-on: multipurpose furnace open that sky oozes or the continuous carbonization EP (end of program) after, select " low-carbon alloy steel high temperature carburizing direct quenching technique " and oil cooling mode, advance stove and finish shove charge by auto-programming;
B, one section (intensification): design temperature (890 ℃) begins to heat up, and passes into methyl alcohol (3ml/min), adjusts atmosphere;
C, two sections (determining to temperature): furnace temperature rises to (890 ℃), set (5min), and the time wait, Flow-rate adjustment passes into methyl alcohol (3ml/min), and the benchmark air pump keeps (80ml/min);
D, three sections (samming): set (5min), soaking time makes uniformity of temperature profile in the stove, and Flow-rate adjustment passes into methyl alcohol (3ml/min), and the benchmark air pump keeps (80ml/min).
(2) ooze the stage by force:
E, four sections (carbon potential is determined): set carbon potential (0.91%C), Flow-rate adjustment passes into carburizing agent propane (6mL/min) simultaneously, methyl alcohol (3ml/min) makes the interior carbon potential of stove rise to gradually set(ting)value and decides 5S maintenance, benchmark air pump (80ml/min);
F, five sections (oozing the stage by force): begin timing after arriving the carbon potential set(ting)value in the stove, the time of oozing by force keeps (70min), this section temperature (890 ℃), carbon potential (0.91%C), benchmark air pump (80ml/min), propane and methyl alcohol flow keep constant among the e.
(3) diffusion phase:
G, six sections (cooling carbon drop gesture): design temperature (810 ℃), carbon potential (0.83%C), instrument control stops to pass into propane automatically, and the methyl alcohol flow remains unchanged, and temperature and carbon potential are down to set(ting)value gradually in the benchmark air pump (80ml/min), stove;
H, seven sections (diffusion temperature and carbon potential are determined): set temperature (810 ℃) and (5min) time wait in the stove, while flow control propane (6ml/min), methyl alcohol (3ml/min), benchmark air pump (80ml/min);
I, eight sections (isothermal diffusion): temperature (810 ℃) in the stove, carbon potential (0.83%C) begins timing (15min) after finishing the setting wait, spread, benchmark air pump (80ml/min), propane (6mL/min), methyl alcohol (3ml/min).
(4) the quenching stage:
J, nine sections (quenching of coming out of the stove): set and come out of the stove, keep temperature in the stove, carbon potential, furnace pressure, in the constant situation of propane and methyl alcohol flow, automatically open fire door behind the signal prompt and pull out the oil of quenching, cooling drains after (30 minutes), namely gets the low-carbon alloy steel after the carburizing.
Embodiment three
(1) preparatory stage:
Prepare before a, blow-on: multipurpose furnace open that sky oozes or the continuous carbonization EP (end of program) after, select " low-carbon alloy steel high temperature carburizing direct quenching technique " and oil cooling mode, advance stove and finish shove charge by auto-programming;
B, one section (intensification): design temperature (910 ℃) begins to heat up, and passes into methyl alcohol (5ml/min), adjusts atmosphere;
C, two sections (determining to temperature): furnace temperature rises to (910 ℃), set (5min), and the time wait, Flow-rate adjustment passes into methyl alcohol (5ml/min), and the benchmark air pump keeps (120ml/min);
D, three sections (samming): set (10min), soaking time makes uniformity of temperature profile in the stove, and Flow-rate adjustment passes into methyl alcohol (5ml/min), and the benchmark air pump keeps (120ml/min).
(2) ooze the stage by force:
E, four sections (carbon potential is determined): set carbon potential (0.89%C), Flow-rate adjustment passes into carburizing agent propane (8mL/min) simultaneously, methyl alcohol (5ml/min) makes the interior carbon potential of stove rise to gradually set(ting)value and decides 5S maintenance, benchmark air pump (120ml/min);
F, five sections (oozing the stage by force): begin timing after arriving the carbon potential set(ting)value in the stove, the time of oozing by force keeps (75min), this section temperature (910 ℃), carbon potential (0.89%C), benchmark air pump (120ml/min), propane and methyl alcohol flow keep constant among the e.
(3) diffusion phase:
G, six sections (cooling carbon drop gesture): design temperature (830 ℃), carbon potential (0.78%C), instrument control stops to pass into propane automatically, and the methyl alcohol flow remains unchanged, and temperature and carbon potential are down to set(ting)value gradually in the benchmark air pump (80ml/min), stove;
H, seven sections (diffusion temperature and carbon potential are determined): set temperature (830 ℃) and (5min) time wait in the stove, while flow control propane (8ml/min), methyl alcohol (5ml/min), benchmark air pump (120ml/min);
I, eight sections (isothermal diffusion): temperature (830 ℃) in the stove, carbon potential (0.78%C) begins timing (12min) after finishing the setting wait, spread, benchmark air pump (120ml/min), propane (8mL/min), methyl alcohol (5ml/min).
(4) the quenching stage:
J, nine sections (quenching of coming out of the stove): set and come out of the stove, keep temperature in the stove, carbon potential, furnace pressure, in the constant situation of propane and methyl alcohol flow, automatically open fire door behind the signal prompt and pull out the oil of quenching, cooling drains after (30 minutes), namely gets the low-carbon alloy steel after the carburizing.
Effect embodiment
The hardness of the low-carbon alloy steel after measurement embodiment one to 3 carburizing all between 81-82HRA, detects its metallographic structure, and M is 3 grades (standard is the 1-4 level), and the F of heart section is 2 grades (standard is the 1-3 level), and layer depth is 0.5mm.
Can find out from Fig. 1 and Fig. 2, the standard after the carburizing is all satisfied in the low-carbon alloy steel surface after the carburizing and the metallographic structure of heart section.
Claims (5)
1. the method for carburizing of a low-carbon alloy steel adopts multipurpose furnace to carry out carburizing, and protective atmosphere adopts methyl alcohol, and carburizing medium adopts propane; It is characterized in that: described method for carburizing may further comprise the steps:
(1) preparatory stage: described low-carbon alloy steel is packed in the described multipurpose furnace; Heat up, continue to pass into methyl alcohol; When temperature rises to 890～910 ℃, continue to pass into methyl alcohol, keep 10～15min and make uniformity of temperature profile in the multipurpose furnace, keeping simultaneously the reference gas flow rate pump is 80～150mL/min; The flow of described methyl alcohol is 3～5mL/min;
(2) ooze the stage by force: keep temperature and reference gas flow rate pump in the multipurpose furnace, in described multipurpose furnace, pass into propane and methyl alcohol, make the interior carbon potential of multipurpose furnace rise to 0.89～0.91%C, keep 70～75min to carry out carburizing; The flow of described methyl alcohol is 3～5mL/min; The flow of described propane is 6～8mL/min;
(3) diffusion phase: keep methyl alcohol and reference gas pumping capacity, temperature to 810 in the reduction multipurpose furnace～830 ℃ stops to pass into propane simultaneously; When carbon potential is down to 0.78～0.83%C in the multipurpose furnace, again pass into propane, keep carbon potential and temperature in the multipurpose furnace, spread 15-20min; The flow of described propane is 6～8mL/min;
(4) the quenching stage: described low-carbon alloy steel is taken out quenching, drain after the cooling and get final product; Described quenchant adopts quenching oil.
2. the method for carburizing of low-carbon alloy steel according to claim 1 is characterized in that: in the described step (1) in the multipurpose furnace temperature rise to 900 ℃, keep 15min and make uniformity of temperature profile in the multipurpose furnace.
3. the method for carburizing of low-carbon alloy steel according to claim 1 is characterized in that: in the described step (2) in the multipurpose furnace carbon potential rise to 0.9%C, keep 70min to carry out carburizing.
4. the method for carburizing of low-carbon alloy steel according to claim 1 is characterized in that: in the described step (3) in the multipurpose furnace temperature be down to 820 ℃, carbon potential is down to 0.80%C, spreads 15min.
5. the method for carburizing of low-carbon alloy steel according to claim 1 is characterized in that: described multipurpose furnace employing BQC-600W sealed-box type nicarbing stove.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
| CN109468577A (en) * | 2018-12-13 | 2019-03-15 | 周俊满 | A kind of annular element carburizing quenching process |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108193164A (en) * | 2017-12-29 | 2018-06-22 | 湖南特科能热处理有限公司 | A kind of method of non-martensite microstructure depth of the reduction low-carbon alloy steel part after carburizing and quenching |
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| CN101381804A (en) * | 2008-10-21 | 2009-03-11 | 宁波宏协机械制造有限公司 | Heat treating method of thin sheet steel type part |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
| CN109468577A (en) * | 2018-12-13 | 2019-03-15 | 周俊满 | A kind of annular element carburizing quenching process |
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Denomination of invention: A carburizing method for low carbon alloy steel Effective date of registration: 20220517 Granted publication date: 20141126 Pledgee: Jiangsu Jinhu Mintai Village Bank Co.,Ltd. Pledgor: JINHU CHANGSHENG POWER MACHINERY PART CO.,LTD. Registration number: Y2022980005549 |
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