CN103820722A - Alloy steel material for drill bits and screw taps and preparation method thereof - Google Patents
Alloy steel material for drill bits and screw taps and preparation method thereof Download PDFInfo
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- CN103820722A CN103820722A CN201410009832.XA CN201410009832A CN103820722A CN 103820722 A CN103820722 A CN 103820722A CN 201410009832 A CN201410009832 A CN 201410009832A CN 103820722 A CN103820722 A CN 103820722A
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Abstract
The invention relates to an alloy steel material for drill bits and screw taps. The alloy steel material comprises the following chemical element constituents by mass percent: 0.7 to 0.9 percent of carbon, 5.1 to 5.3 percent of tungsten, 1.0 to 1.2 percent of molybdenum, 11.2 to 11.6 percent of chromium, 2.5 to 2.8 percent of manganese, 0.2 to 0.3 percent of silicon, 0.12 to 0.16 percent of Ta, 0.12 to 0.16 percent of Er, 0.08 to 0.10 percent of Nd, and the balance of iron and other inevitable impurities. A crystal structure increases intensity and wear resistance, at the same time, the alloy steel material has higher red hardness, so that the alloy steel material is suitable for manufacturing long drill bits and the screw taps, the alloy steel material is not easy to break, and the service life of the alloy steel material is long. Through reasonably controlling processing temperature after casting and putting the raw materials in batches, the intensity and the wear resistance of alloy are increased, brittleness is reduced, and through using scrap iron as the raw materials, the quality of the alloy is homogeneous. The refining agent of the alloy steel material is used for casting production, air hole degrees in casts can be reduced by 1 to 2 degrees, oxide inclusions are at about 2-level, and the rate of finished products is obviously increased.
Description
Technical field
The present invention relates to field of alloy material, relate in particular to alloy steel material that a kind of drill bit, screw tap use and preparation method thereof.
Background technology
Electric drill is a kind of widely used power tool, is widely used in building, processing and other fields.The cardinal principle of electric drill is the rotation by electric motor, drives and drives apparatus for work, thereby make drill bit scrapings surface to pierce object, and drill bit is one of requisite parts of electric drill.
Drill bit material is mainly rapid steel and Wimet at present, these two kinds of alloy rigidities are high, wear-resisting, red hardness is good, and keep certain toughness, but electric drill in use, often occur fractureing, the easy to wear or buckling phenomenon of blade, drill bit often needs to change, and is mainly because the performances such as the hardness of drill bit material, wear resistance, toughness can not reach balance.
Summary of the invention
The object of the present invention is to provide alloy steel material that a kind of drill bit, screw tap use and preparation method thereof, this grinding ball material has advantages of high rigidity, wear resistance is good, intensity is high.
Technical scheme of the present invention is as follows:
The alloy steel material that drill bit, screw tap are used, is characterized in that: chemical element composition and mass percent thereof that it contains are: carbon 0.7-0.9, tungsten 5.1-5.3, molybdenum 1.0-1.2, chromium 11.2-11.6, manganese 2.5-2.8, silicon 0.2-0.3, Ta0.12-0.16, Er0.12-0.16, Nd0.08-0.10 surplus are iron and other inevitable impurity.
The production method of described drill bit, the alloy steel material that screw tap is used, is characterized in that:
(1), preparing the pig iron and scrap iron originates as ferrous substrate in 1:0.2-0.5 ratio, the pig iron is added to drop in stove and melt, carry out desulfurization, deoxidation, employing refining agent initial refining, add alloying constituent and carry out alloying, then add scrap iron fusing, add refining agent secondary refining, detection and adjust chemical element component content to qualified, casting, casting postheat treatment etc.;
(2) in alloying process, to the lot sequence that drops into alloying element in stove be: (1) chromium, silicon, Er; (2) tungsten, other remaining components of molybdenum (3); The each batch of timed interval of dropping into element is 20-24 minute, after feeding intake, stirs.
Described casting postheat treatment is: be first warming up to 750-760 ℃ by room temperature with 250-260 ℃/h of speed, and insulation 50-70 minute, then be warming up to 940-950 ℃ with 250-260 ℃/h of speed, insulation 3-4 hour; Be cooled to 630-640 ℃ with 250-260 ℃/h of speed again, insulation 70-80 minute, then be cooled to 200-220 ℃ with 240-250 ℃/h of speed, insulation 2-3 hour; Be warming up to 360-380 ℃ with 170-180 ℃/h of speed again, insulation 40-50 minute, then be warming up to 540-550 ℃ with 170-180 ℃/h of speed, insulation 3-4 hour, takes out air cooling and get final product.
Described refining agent is made up of the raw material of following weight part: rhombspar 13-15, clay 30-35, aluminium sesquioxide 2-3, nanometer titanium dioxide 2-3, aluminium powder 1-2, tripoly phosphate sodium STPP 1-2, ferric oxide 2-3, fluorite 6-8, jade powder 3-4, montmorillonite 1-2, trees ashes 1-2, Na
2tiF
68-10; Its preparation method is that rhombspar, clay, fluorite, jade powder, montmorillonite, trees ashes are mixed, be heated to 2500-3000 ℃, stir 1-2 hour, after cooling, be added in the hydrochloric acid soln of 10-15%, soak 1-2 hour, filter, filter residue is cleaned with clear water repeatedly, dries, and merges and mixes and get final product with other composition.
Beneficial effect of the present invention
Steel alloy of the present invention, in having kept enough hardness, by adding Ta, Er, Nd, has changed crystal structure, has increased intensity and wear resistance, has higher red hardness simultaneously, is applicable to make long drill bit, screw tap, not frangibility, long service life; The present invention is by rationally controlling casting post-processing temperature, and throwing raw materials has in batches increased intensity, the wear resistance of alloy, has reduced fragility, by using scrap iron as raw material, makes alloy quality homogeneous.Refining agent of the present invention, for Foundry Production, can make the degree of porosity in foundry goods reduce 1-2 degree, and oxide inclusion, 2 grades of left and right, has obviously improved yield rate.
Embodiment
The alloy steel material that drill bit, screw tap are used, chemical element composition and mass percent thereof that it contains are: carbon 0.7-0.9, tungsten 5.1-5.3, molybdenum 1.0-1.2, chromium 11.2-11.6, manganese 2.5-2.8, silicon 0.2-0.3, Ta0.12-0.16, Er0.12-0.16, Nd0.08-0.10 surplus are iron and other inevitable impurity.
The production method of described drill bit, the alloy steel material that screw tap is used is:
(1), preparing the pig iron and scrap iron originates as ferrous substrate in 1:0.3 ratio, the pig iron is added to drop in stove and melt, carry out desulfurization, deoxidation, employing refining agent initial refining, add alloying constituent and carry out alloying, then add scrap iron fusing, add refining agent secondary refining, detection and adjust chemical element component content to qualified, casting, casting postheat treatment etc.;
(2) in alloying process, to the lot sequence that drops into alloying element in stove be: (1) chromium, silicon, Er; (2) tungsten, other remaining components of molybdenum (3); The each batch of timed interval of dropping into element is 22 minutes, after feeding intake, stirs.
Described casting postheat treatment is: be first warming up to 755 ℃ by room temperature with 255 ℃/h of speed, be incubated 60 minutes, then be warming up to 945 ℃ with 255 ℃/h of speed, be incubated 3.5 hours; Be cooled to 635 ℃ with 255 ℃/h of speed again, be incubated 75 minutes, then be cooled to 210 ℃ with 245 ℃/h of speed, be incubated 2.5 hours; Be warming up to 370 ℃ with 175 ℃/h of speed again, be incubated 45 minutes, then be warming up to 545 ℃ with 175 ℃/h of speed, be incubated 3.5 hours, take out air cooling and get final product.
Described refining agent by following weight part (kilogram) raw material make: rhombspar 13, clay 30, aluminium sesquioxide 3, nanometer titanium dioxide 2, aluminium powder 1, tripoly phosphate sodium STPP 2, ferric oxide 3, fluorite 6, jade powder 4, montmorillonite 1, trees ashes 1, Na
2tiF
68; Its preparation method is that rhombspar, clay, fluorite, jade powder, montmorillonite, trees ashes are mixed, be heated to 2500-3000 ℃, stir 1-2 hour, after cooling, be added in the hydrochloric acid soln of 10-15%, soak 1-2 hour, filter, filter residue is cleaned with clear water repeatedly, dries, and merges and mixes and get final product with other composition.
The mechanical property of the drill bit of the present embodiment, the alloy steel material that screw tap is used is: hardness 66HRC, hardness 48 HRC 600 ℃ time, impact absorbing energy 55J, impelling strength 66J/cm
2.
Claims (3)
1. the alloy steel material that drill bit, screw tap are used, is characterized in that: chemical element composition and mass percent thereof that it contains are: carbon 0.7-0.9, tungsten 5.1-5.3, molybdenum 1.0-1.2, chromium 11.2-11.6, manganese 2.5-2.8, silicon 0.2-0.3, Ta0.12-0.16, Er0.12-0.16, Nd0.08-0.10 surplus are iron and other inevitable impurity.
2. the production method of the alloy steel material that drill bit according to claim 1, screw tap are used, is characterized in that:
(1), preparing the pig iron and scrap iron originates as ferrous substrate in 1:0.2-0.5 ratio, the pig iron is added to drop in stove and melt, carry out desulfurization, deoxidation, employing refining agent initial refining, add alloying constituent and carry out alloying, then add scrap iron fusing, add refining agent secondary refining, detection and adjust chemical element component content to qualified, casting, casting postheat treatment etc.;
(2) in alloying process, to the lot sequence that drops into alloying element in stove be: (1) chromium, silicon, Er; (2) tungsten, other remaining components of molybdenum (3); The each batch of timed interval of dropping into element is 20-24 minute, after feeding intake, stirs.
3. the production method of the alloy steel material that drill bit according to claim 2, screw tap are used, it is characterized in that: described casting postheat treatment is: be first warming up to 750-760 ℃ by room temperature with 250-260 ℃/h of speed, insulation 50-70 minute, be warming up to 940-950 ℃ with 250-260 ℃/h of speed again, insulation 3-4 hour; Be cooled to 630-640 ℃ with 250-260 ℃/h of speed again, insulation 70-80 minute, then be cooled to 200-220 ℃ with 240-250 ℃/h of speed, insulation 2-3 hour; Be warming up to 360-380 ℃ with 170-180 ℃/h of speed again, insulation 40-50 minute, then be warming up to 540-550 ℃ with 170-180 ℃/h of speed, insulation 3-4 hour, takes out air cooling and get final product.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410009832.XA CN103820722A (en) | 2014-01-09 | 2014-01-09 | Alloy steel material for drill bits and screw taps and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410009832.XA CN103820722A (en) | 2014-01-09 | 2014-01-09 | Alloy steel material for drill bits and screw taps and preparation method thereof |
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| Publication Number | Publication Date |
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| CN103820722A true CN103820722A (en) | 2014-05-28 |
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| CN201410009832.XA Pending CN103820722A (en) | 2014-01-09 | 2014-01-09 | Alloy steel material for drill bits and screw taps and preparation method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107557689A (en) * | 2017-11-01 | 2018-01-09 | 南通欧科数控设备有限公司 | A kind of production method of drill bit steel alloy |
| CN107974633A (en) * | 2017-11-01 | 2018-05-01 | 南通欧科数控设备有限公司 | A kind of drill bit alloy steel material and preparation method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1385548A (en) * | 2001-03-05 | 2002-12-18 | 石田清仁 | Easy cut tool steel |
| CN102978526A (en) * | 2012-11-22 | 2013-03-20 | 浙江明磊工具实业有限公司 | Alloy steel material for drill and preparation method |
-
2014
- 2014-01-09 CN CN201410009832.XA patent/CN103820722A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1385548A (en) * | 2001-03-05 | 2002-12-18 | 石田清仁 | Easy cut tool steel |
| CN102978526A (en) * | 2012-11-22 | 2013-03-20 | 浙江明磊工具实业有限公司 | Alloy steel material for drill and preparation method |
Non-Patent Citations (1)
| Title |
|---|
| 饶启昌等: "耐磨材料热处理问题的探讨", 《水利电力机械》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107557689A (en) * | 2017-11-01 | 2018-01-09 | 南通欧科数控设备有限公司 | A kind of production method of drill bit steel alloy |
| CN107974633A (en) * | 2017-11-01 | 2018-05-01 | 南通欧科数控设备有限公司 | A kind of drill bit alloy steel material and preparation method thereof |
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Application publication date: 20140528 |
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