CN102703666B - Low-carbon alloy steel spheroidizing method - Google Patents
Low-carbon alloy steel spheroidizing method Download PDFInfo
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- CN102703666B CN102703666B CN201210166324.3A CN201210166324A CN102703666B CN 102703666 B CN102703666 B CN 102703666B CN 201210166324 A CN201210166324 A CN 201210166324A CN 102703666 B CN102703666 B CN 102703666B
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Abstract
The invention relates to a low-carbon alloy steel spheroidizing method, specifically to a method for spheroidizing low-carbon alloy steels. The method comprises the following steps: heating low-carbon alloy steel rods, removing surface scales, coating lubricants on surfaces, rolling headers, pulling semi-finished products, and performing spheroidizing annealing. According to the method, product quality can be increased, and production cost can be reduced.
Description
Technical field
The present invention relates to a kind of steel working method.Specifically, be a kind of method of low-carbon alloy steel being carried out to spheroidizing.
Background technology
At steel production industry, all know, low-carbon alloy steel has been widely used in the production of cold-heading part and cold-extruded part.In cold-heading, extrusion production process, steel can be subject to high racking stress, and this just requires the steel before extruding will have higher resistance to deformability.And the resistance to deformability of steel height depends on that again its globular pearlite organizes the height of ratio, globular pearlite organizes ratio high, and resistance to deformability is just high.For improving the resistance to deformability of steel, traditional method is all to adopt single Spheroidizing Annealing method.Because the carbon content of low-carbon alloy steel is lower, pearlitic content is few, and the possibility that forms core in annealing process is just little, and the pelletization of lamellar pearlite tissue changes just more difficult.Therefore, only depend on single Spheroidizing Annealing method, be difficult to improve the resistance to deformability of steel, make cold-heading, extrusion yield rate low, of low quality.In addition, traditional Spheroidizing Annealing method mainly contains common Spheroidizing Annealing and isothermal spheroidizing.Common Spheroidizing Annealing is that steel are heated to above to A
c120 ~ 30 the spending and be incubated after 8 ~ 10 hours of (heating starting temperature of transformation), stops heating naturally cooling to after 500 degree and takes out and carry out air cooling.Isothermal spheroidizing is equally steel to be heated to above to A
c120 ~ 30 the spending and be incubated after 4 hours of (heating starting temperature of transformation), stopping heating naturally cools to a little less than A
r1(cooling lower change point temperature) isothermal 6 ~ 8 hours, then naturally cool to after 500 degree and take out and carry out air cooling.As can be seen here, no matter be common Spheroidizing Annealing, or isothermal spheroidizing, Heating temperature is all higher, makes energy consumption large, and production cost is higher.
Summary of the invention
The problem to be solved in the present invention is to provide a kind of low-carbon alloy steel spheronization process.Adopt in this way, can improve the quality of products, reduce production costs.
For addressing the above problem, take following technical scheme:
Low-carbon alloy steel spheronization process feature of the present invention is to comprise the following steps successively:
First choose the low-carbon alloy steel disk unit of Ф 16 ~ 20mm;
Then, the low-carbon alloy steel disk unit of Ф 16 ~ 20mm is put into annealing furnace, heat to 680 ~ 700 ℃; At this temperature, be incubated after 5 ~ 7 hours, furnace cooling to 590 ~ 610 ℃, take out;
Afterwards, remove the oxide skin on low-carbon alloy steel surface, and allow its seasoning;
Afterwards, at the low-carbon alloy steel surface coating lubricant except descaling;
Afterwards, in the low-carbon alloy steel one end with lubricant, shutting out diameter is the chieftain that 13 ~ 15mm, length are 150mm, so that wear die drawing, pulls out;
Afterwards, the pulling rate with inverted machine drawing with 50 ms/min, pulls into the low-carbon alloy steel of Ф 16 ~ 20mm the work in-process of Ф 13.5 ~ 16mm, makes half-finished cold drawing deformation rate reach 28.8 ~ 36%;
Afterwards, pack work in-process packing into strong convection bell-type electric heater frost protection atmosphere furnace, heat to 700 ~ 730 ℃, and be incubated 9 ~ 11 hours at this temperature, carry out Spheroidizing Annealing, half-finished nodularization rate is reached more than 80%, obtain Finished Steel.
Described low-carbon alloy steel is 20CrMo steel.Described lubricant is grease liquor calcis.Described special atmosphere oven is decomposed ammonia stove.
Take such scheme, have the following advantages:
As can be seen from the above scheme, because the present invention adopts between twice Spheroidizing Annealing, steel have been carried out to drawing.By the cold drawing to steel, make the lattice generation slippage of steel, lamellar pearlite produces the tendency of breaking.Like this, when carrying out for the second time Spheroidizing Annealing, can greatly reduce nodularization temperature, shorten soaking time.Compare with isothermal spheroidizing with common nodularization, not only nodularization temperature is lower, can decline more than 50 degree, and nodularization rate is high approaches 100%.
Embodiment
Below in conjunction with embodiment, the present invention is described in further detail:
Embodiment mono-
The low-carbon alloy steel disk unit that first chooses Ф 16mm, described low-carbon alloy steel is 20CrMo steel;
Then, the low-carbon alloy steel disk unit of Ф 16mm is put into annealing furnace, heat to 680 ℃; At this temperature, be incubated after 5 hours, furnace cooling to 600 ℃, takes out;
Afterwards, adopt four ramming head continous way shot-blasting machines to remove the oxide skin on low-carbon alloy steel surface, and allow its seasoning;
Afterwards, at the low-carbon alloy steel surface coating lubricant except descaling, described lubricant is grease liquor calcis;
Afterwards, in the low-carbon alloy steel one end with lubricant, shutting out diameter is the chieftain that 14mm, length are 150mm, so that wear mould, carries out drawing;
Afterwards, the pulling rate with inverted machine drawing with 50 ms/min, pulls into the low-carbon alloy steel of Ф 16mm the work in-process of Ф 13.5mm, makes half-finished cold drawing deformation rate reach 28.8%;
Afterwards, pack work in-process packing into strong convection bell-type electric heater frost protection atmosphere furnace, heat to 720 ℃, and be incubated 9 hours at this temperature, carry out Spheroidizing Annealing.Described protective atmosphere is decomposed ammonia stove;
Afterwards, while allowing through the work in-process furnace cooling to 100 of Spheroidizing Annealing ℃, vacuumize and come out of the stove, obtain Finished Steel;
Finally, with metaloscope, Finished Steel is carried out to metallographic examination, obtain nodularization rate and reach 96% Finished Steel.Described metaloscope is XZT-6A type metaloscope, and its magnification is 500 times.
Embodiment bis-
The low-carbon alloy steel disk unit that first chooses Ф 18mm, described low-carbon alloy steel is 20CrMo steel;
Then, the low-carbon alloy steel disk unit of Ф 18mm is put into annealing furnace, heat to 690 ℃; At this temperature, be incubated after 6 hours, furnace cooling to 590 ℃, takes out;
Afterwards, adopt four ramming head continous way shot-blasting machines to remove the oxide skin on low-carbon alloy steel surface, and allow its seasoning;
Afterwards, at the low-carbon alloy steel surface coating lubricant except descaling, described lubricant is grease liquor calcis;
Afterwards, in the low-carbon alloy steel one end with lubricant, shutting out diameter is the chieftain that 14mm, length are 150mm, so that wear mould, carries out drawing;
Afterwards, the pulling rate with inverted machine drawing with 50 ms/min, pulls into the low-carbon alloy steel of Ф 18mm the work in-process of Ф 15mm, makes half-finished cold drawing deformation rate reach 30.5%;
Afterwards, pack work in-process packing into strong convection bell-type electric heater frost protection atmosphere furnace, heat to 700 ℃, and be incubated 10 hours at this temperature, carry out Spheroidizing Annealing.Described protective atmosphere is decomposed ammonia stove;
Afterwards, while allowing through the work in-process furnace cooling to 100 of Spheroidizing Annealing ℃, vacuumize and come out of the stove, obtain Finished Steel;
Finally, with metaloscope, Finished Steel is carried out to metallographic examination, obtain nodularization rate and reach 98% Finished Steel.Described metaloscope is XZT-6A type metaloscope, and its magnification is 500 times.
Embodiment tri-
The low-carbon alloy steel disk unit that first chooses Ф 20mm, described low-carbon alloy steel is 20CrMo steel;
Then, the low-carbon alloy steel disk unit of Ф 20mm is put into annealing furnace, heat to 700 ℃; At this temperature, be incubated after 7 hours, furnace cooling to 610 ℃, takes out;
Afterwards, adopt four ramming head continous way shot-blasting machines to remove the oxide skin on low-carbon alloy steel surface, and allow its seasoning;
Afterwards, at the low-carbon alloy steel surface coating lubricant except descaling, described lubricant is grease liquor calcis;
Afterwards, in the low-carbon alloy steel one end with lubricant, shutting out diameter is the chieftain that 15mm, length are 150mm, so that wear mould, carries out drawing;
Afterwards, the pulling rate with inverted machine drawing with 50 ms/min, pulls into the low-carbon alloy steel of Ф 20mm the work in-process of Ф 16mm, makes half-finished cold drawing deformation rate reach 36%;
Afterwards, pack work in-process packing into strong convection bell-type electric heater frost protection atmosphere furnace, heat to 730 ℃, and be incubated 11 hours at this temperature, carry out Spheroidizing Annealing.Described protective atmosphere is decomposed ammonia stove;
Afterwards, while allowing through the work in-process furnace cooling to 100 of Spheroidizing Annealing ℃, vacuumize and come out of the stove, obtain Finished Steel;
Finally, with metaloscope, Finished Steel is carried out to metallographic examination, obtain nodularization rate and reach 99% Finished Steel.Described metaloscope is XZT-6A type metaloscope, and its magnification is 500 times.
Claims (4)
1. low-carbon alloy steel spheronization process, is characterized in that comprising the following steps successively:
First choose the low-carbon alloy steel disk unit of Ф 16 ~ 20mm;
Then, the low-carbon alloy steel disk unit of Ф 16 ~ 20mm is put into annealing furnace, heat to 680 ~ 700 ℃; At this temperature, be incubated after 5 ~ 7 hours, furnace cooling to 590 ~ 610 ℃, take out;
Afterwards, remove the oxide skin on low-carbon alloy steel surface, and allow its seasoning;
Afterwards, then except the low-carbon alloy steel surface coating lubricant of descaling;
Afterwards, in the low-carbon alloy steel one end with lubricant, shutting out diameter is the chieftain that 13 ~ 15mm, length are 150mm, so that wear die drawing, pulls out;
Afterwards, the pulling rate with inverted machine drawing with 50 ms/min, pulls into the low-carbon alloy steel of Ф 16 ~ 20mm the work in-process of Ф 13.5 ~ 16mm, makes half-finished cold drawing deformation rate reach 28.8 ~ 36%;
Afterwards, pack work in-process packing into strong convection bell-type electric heater frost protection atmosphere furnace, heat to 700 ~ 730 ℃, and be incubated 9 ~ 11 hours at this temperature, carry out Spheroidizing Annealing, half-finished nodularization rate is reached more than 80%, obtain Finished Steel;
Described low-carbon alloy steel is 20CrMo steel.
2. low-carbon alloy steel spheronization process according to claim 1, is characterized in that described lubricant is grease liquor calcis.
3. low-carbon alloy steel spheronization process according to claim 1, is characterized in that described special atmosphere oven is ammonia dissolving atmosphere stove.
4. low-carbon alloy steel spheronization process according to claim 3, is characterized in that the mixed atmosphere that the nitrogen of hydrogen that ammonia dissolving atmosphere is 75% by volume and 25% forms, and its dew point is lower than-40 ℃.
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| CN106011404A (en) * | 2016-07-08 | 2016-10-12 | 邢台钢铁有限责任公司 | Spheroidizing annealing method for medium-and-low-carbon alloy cold forging steel |
| CN106521107B (en) * | 2016-10-17 | 2018-12-21 | 江阴兴澄特种钢铁有限公司 | A kind of novel spheroidizing method of low-carbon bainite steel |
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| CN102417957A (en) * | 2011-10-24 | 2012-04-18 | 无锡翱天钢丝制品有限公司 | Heat treatment process of steel 1008 |
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| CN102417957A (en) * | 2011-10-24 | 2012-04-18 | 无锡翱天钢丝制品有限公司 | Heat treatment process of steel 1008 |
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| Title |
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| JP平1-142026A 1989.06.02 |
| 刘嘎等.金属针布钢丝的球化退火工艺.《金属制品》.2007,第33卷(第4期),9-13. |
| 金属针布钢丝的球化退火工艺;刘嘎等;《金属制品》;20070831;第33卷(第4期);9-13 * |
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Denomination of invention: Low-carbon alloy steel spheroidizing method Effective date of registration: 20190912 Granted publication date: 20140226 Pledgee: Bank of Jiangsu Wuxi branch, Limited by Share Ltd, Huishan Pledgor: Wuxi Tianchen Cold-drawing Steel Co., Ltd. Registration number: Y2019990000231 |