CN102703657A - Medium carbon steel spheroidizing method - Google Patents
Medium carbon steel spheroidizing method Download PDFInfo
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- CN102703657A CN102703657A CN2012101663258A CN201210166325A CN102703657A CN 102703657 A CN102703657 A CN 102703657A CN 2012101663258 A CN2012101663258 A CN 2012101663258A CN 201210166325 A CN201210166325 A CN 201210166325A CN 102703657 A CN102703657 A CN 102703657A
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Abstract
The invention relates to a medium carbon steel spheroidizing method, specifically to a method for spheroidizing medium carbon steels. The method comprises the following steps: heating medium carbon 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 medium carbon steel being carried out spheroidizing.
Background technology
Know all that at the steel production industry medium carbon steel has been widely used in the production of cold-heading part and cold-extruded part.In cold-heading, extrusion production process, steel can receive high racking stress, and the steel before this just requires to push will have higher anti-deformability.And the anti-deformability of steel height depends on that again its globular pearlite organizes the height of ratio, and globular pearlite organizes ratio high, and anti-deformability is just high.For improving the anti-deformability of steel, traditional method all is to adopt single Spheroidizing Annealing method.Because the carbon content of medium carbon steel is lower, pearlitic content is few, and the possibility that in annealing process, forms nuclear is just little, and the pelletization of lamellar pearlite tissue just changes relatively difficulty.Therefore, only depend on single Spheroidizing Annealing method, be difficult to improve the anti-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 after steel are heated to above 20 ~ 30 degree of Ac1 (heating starting temperature of transformation) and are incubated 8 ~ 10 hours, stops to heat naturally cooling to 500 degree backs and taking out and carry out air coolings.Isothermal spheroidizing is equally steel to be heated to above A
C1(heating starting temperature of transformation) 20 ~ 30 the degree and be incubated 4 hours after, stopping to heat naturally cools to a little less than A
R1(cooling lower change point temperature) isothermal naturally cools to 500 degree back taking-up carrying out air coolings after 6 ~ 8 hours again.No matter this shows, be common Spheroidizing Annealing, or isothermal spheroidizing, and Heating temperature is all higher, and energy consumption is big, makes production cost higher.
Summary of the invention
The problem that the present invention will solve provides a kind of medium carbon steel spheronization process.Adopt this method, not only can improve the quality of products, reduce production costs.
For addressing the above problem, take following technical scheme:
Medium carbon steel spheronization process characteristics of the present invention are to may further comprise the steps successively:
Choose the medium carbon steel dish unit of Ф 10 ~ 12mm earlier;
Then, remove the oxide debris on medium carbon steel surface, and let its seasoning;
Afterwards, at the medium carbon steel surface applied lubricant that removes descaling;
Afterwards, shutting out diameter at the medium carbon steel that has lubricant one end is that 7 ~ 9mm, length are the chieftain of 150mm, pulls out so that wear die drawing;
Afterwards, with the pulling rate of inverted machine drawing with 50 meters/minute, the medium carbon steel of Ф 10 ~ 12mm is pulled into the work in-process of Ф 8 ~ 11mm, making half-finished cold drawn deformation rate is 30.5 ~ 36%;
Afterwards,, heat to 700 ~ 720 ℃, and under this temperature, be incubated 6 ~ 8 hours, carry out Spheroidizing Annealing, half-finished nodularization rate is reached more than 90%, obtain Finished Steel the work in-process packings strong convection bell-type electrically heated special atmosphere oven of packing into.
Said medium carbon steel is No. 45 steel.Said lubricant is the grease liquor calcis.
Said protective atmosphere is the mixed atmosphere that the nitrogen of 75% hydrogen and 25% is formed by volume, and its dew point is lower than-40 ℃.
Take such scheme, have the following advantages:
Can find out by such scheme and since the present invention adopt earlier steel are carried out drawing after, carry out Spheroidizing Annealing again.Through cold drawing to steel, make the lattice generation slippage of steel, lamellar pearlite produces the tendency of breaking.Like this, when carrying out Spheroidizing Annealing again, can reduce the nodularization temperature greatly, shorten soaking time.Compare with isothermal spheroidizing with common nodularization, not only nodularization temperature is lower, can descend more than 50 degree, and nodularization rate height is near 100%.
Embodiment
Below in conjunction with embodiment the present invention is done further explain:
Embodiment one
Middle steel ball method is characterized in that may further comprise the steps successively:
Choose the medium carbon steel dish unit of Ф 10mm earlier, said medium carbon steel is No. 45 steel;
Then, remove the oxide debris on medium carbon steel surface, and let its seasoning with four ramming head continous way shot-blasting machines;
Afterwards, at the medium carbon steel surface applied lubricant that removes descaling, said lubricant is the grease liquor calcis;
Afterwards, shutting out diameter at the medium carbon steel that has lubricant one end is that 7mm, length are the chieftain of 150mm, carries out drawing so that wear mould;
Afterwards,, the medium carbon steel of Ф 10mm is pulled into the work in-process of Ф 8mm, make half-finished cold drawn deformation rate reach 36% with the pulling rate of inverted machine drawing with 50 meters/minute;
Afterwards,, heat to 700 ℃ with the work in-process packings strong convection bell-type electrically heated special atmosphere oven of packing into, and insulation 6 hours under this temperature, carry out Spheroidizing Annealing, half-finished nodularization rate is reached more than 96%, obtain Finished Steel.Special atmosphere oven wherein is the mixed atmosphere that the nitrogen of 75% hydrogen and 25% is formed by volume, and its dew point is lower than-40 ℃.
Embodiment two
Middle steel ball method is characterized in that may further comprise the steps successively:
Choose the medium carbon steel dish unit of Ф 11mm earlier, said medium carbon steel is No. 45 steel;
Then, remove the oxide debris on medium carbon steel surface, and let its seasoning with four ramming head continous way shot-blasting machines;
Afterwards, at the medium carbon steel surface applied lubricant that removes descaling, said lubricant is the grease liquor calcis;
Afterwards, shutting out diameter at the medium carbon steel that has lubricant one end is that 8mm, length are the chieftain of 150mm, carries out drawing so that wear mould;
Afterwards,, the medium carbon steel of Ф 11mm is pulled into the work in-process of Ф 9mm, make half-finished cold drawn deformation rate reach 33% with the pulling rate of inverted machine drawing with 50 meters/minute;
Afterwards,, heat to 710 ℃ with the work in-process packings strong convection bell-type electrically heated special atmosphere oven of packing into, and insulation 7 hours under this temperature, carry out Spheroidizing Annealing, half-finished nodularization rate is reached more than 98%, obtain Finished Steel.Special atmosphere oven wherein is the mixed atmosphere that the nitrogen of 75% hydrogen and 25% is formed by volume, and its dew point is lower than-40 ℃.
Embodiment three
Middle steel ball method is characterized in that may further comprise the steps successively:
Choose the medium carbon steel dish unit of Ф 12mm earlier, said medium carbon steel is No. 45 steel;
Then, remove the oxide debris on medium carbon steel surface, and let its seasoning with four ramming head continous way shot-blasting machines;
Afterwards, at the medium carbon steel surface applied lubricant that removes descaling, said lubricant is the grease liquor calcis;
Afterwards, shutting out diameter at the medium carbon steel that has lubricant one end is that 9mm, length are the chieftain of 150mm, carries out drawing so that wear mould;
Afterwards,, the medium carbon steel of Ф 12mm is pulled into the work in-process of Ф 10mm, make half-finished cold drawn deformation rate reach 30.5% with the pulling rate of inverted machine drawing with 50 meters/minute;
Afterwards,, heat to 720 ℃ with the work in-process packings strong convection bell-type electrically heated special atmosphere oven of packing into, and insulation 8 hours under this temperature, carry out Spheroidizing Annealing, half-finished nodularization rate is reached more than 99%, obtain Finished Steel.Special atmosphere oven wherein is the mixed atmosphere that the nitrogen of 75% hydrogen and 25% is formed by volume, and its dew point is lower than-40 ℃.
Claims (5)
1. medium carbon steel spheronization process is characterized in that may further comprise the steps successively:
Choose the medium carbon steel dish unit of Ф 10 ~ 12mm earlier;
Then, remove the oxide debris on medium carbon steel surface, and let its seasoning;
Afterwards, at the medium carbon steel surface applied lubricant that removes descaling;
Afterwards, shutting out diameter at the medium carbon steel that has lubricant one end is that 7 ~ 9mm, length are the chieftain of 150mm, pulls out so that wear die drawing;
Afterwards, with the pulling rate of inverted machine drawing with 50 meters/minute, the medium carbon steel of Ф 10 ~ 12mm is pulled into the work in-process of Ф 8 ~ 11mm, making half-finished cold drawn deformation rate is 30.5 ~ 36%;
Afterwards,, heat to 700 ~ 720 ℃, and under this temperature, be incubated 6 ~ 8 hours, carry out Spheroidizing Annealing, half-finished nodularization rate is reached more than 90%, obtain Finished Steel the work in-process packings strong convection bell-type electrically heated special atmosphere oven of packing into.
2. medium carbon steel spheronization process according to claim 1 is characterized in that said medium carbon steel is No. 45 steel.
3. medium carbon steel spheronization process according to claim 1 is characterized in that said lubricant is the grease liquor calcis.
4. low-carbon alloy steel spheronization process according to claim 1 is characterized in that said special atmosphere oven is an ammonia dissolving atmosphere.
5. medium carbon steel spheronization process according to claim 1 is characterized in that said ammonia dissolving atmosphere is the mixed atmosphere that the nitrogen of 75% hydrogen and 25% is formed by volume, and its dew point is lower than-40 ℃.
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| CN2012101663258A CN102703657A (en) | 2012-05-27 | 2012-05-27 | Medium carbon steel spheroidizing method |
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| CN2012101663258A CN102703657A (en) | 2012-05-27 | 2012-05-27 | Medium carbon steel spheroidizing method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103572012A (en) * | 2013-11-06 | 2014-02-12 | 南京工程学院 | Rapid spheroidizing technique in bolt manufacturing process |
| CN104630436A (en) * | 2013-11-06 | 2015-05-20 | 南京工程学院 | Rapid spheroidizing technology of cold-drawn deformed steel wires |
| CN105018712A (en) * | 2014-04-23 | 2015-11-04 | 东莞市科力钢铁线材有限公司 | Spheroidizing annealing process of superplastic medium carbon steel wire |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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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2012
- 2012-05-27 CN CN2012101663258A patent/CN102703657A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
Non-Patent Citations (1)
| Title |
|---|
| 解振林等: "60钢冷拔钢丝的球化退火", 《钢铁研究》, no. 1, 29 February 2004 (2004-02-29) * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103572012A (en) * | 2013-11-06 | 2014-02-12 | 南京工程学院 | Rapid spheroidizing technique in bolt manufacturing process |
| CN104630436A (en) * | 2013-11-06 | 2015-05-20 | 南京工程学院 | Rapid spheroidizing technology of cold-drawn deformed steel wires |
| CN103572012B (en) * | 2013-11-06 | 2015-06-24 | 南京工程学院 | Rapid spheroidizing technique in bolt manufacturing process |
| CN104630436B (en) * | 2013-11-06 | 2017-09-26 | 南京工程学院 | A kind of fast spheroidizing annealing handling process of drawing deformation steel wire |
| CN105018712A (en) * | 2014-04-23 | 2015-11-04 | 东莞市科力钢铁线材有限公司 | Spheroidizing annealing process of superplastic medium carbon steel wire |
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Application publication date: 20121003 |