CN103643113A - Tungsten dysprosium-containing manganese steel material for bearings and preparation method thereof - Google Patents
Tungsten dysprosium-containing manganese steel material for bearings and preparation method thereof Download PDFInfo
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- CN103643113A CN103643113A CN201310558344.XA CN201310558344A CN103643113A CN 103643113 A CN103643113 A CN 103643113A CN 201310558344 A CN201310558344 A CN 201310558344A CN 103643113 A CN103643113 A CN 103643113A
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Abstract
A tungsten dysprosium-containing manganese steel material for bearings comprises the following chemical element components by mass percent: 1.2-1.4% of carbon, 1.1-1.3% of silicon, 8.2-9.4% of manganese, 1.3-1.5% of tungsten, 0.02-0.04% of Gd, 0.20-0.28% of Dy, not more than 0.04% of S, not more than 0.04% of P, and the balance of iron. By adding tungsten element and rare earth elements of Dy and Gd, the manganese steel of the invention has the advantages of good toughness, high yield strength, high processing hardening degree, and better wear resistance when compared with current steel. The manganese steel of the invention is suitable for manufacturing parts used in wearing conditions, especially impact wearing conditions, such as large-scale pump truck bearings and the like, is long in service life, and high in safety factor. The method of the invention adopts a refining agent in the casting production, which significantly improves the yield, especially reduces the degree of porosity in casting by 1-2 degrees, does not generate pores on casting surfaces, significantly reduces oxide inclusions, and controls the oxide inclusion level at about grade two.
Description
Technical field
The present invention relates to metallic substance preparation field, relate in particular to tungstenic dysprosium manganese steel material and preparation method thereof for a kind of bearing.
Background technology
The environment of pump valve work is various, badly, very high to the requirement of material, the steel alloy that pump valve is used at present has varied, technology has very much progress, but still have a lot of problems to exist, as wear resistance, hardness, rustless property, corrosion resistance nature, high and low temperature resistance, fragility, toughness etc., in a lot of occasions, can't meet the requirement of production, also require further improvement, to enhance productivity, reduce costs, improve security, for high-quality precision and sophisticated technology development provides safeguard, for social development provides power, task is also very arduous.
Summary of the invention
The object of the present invention is to provide tungstenic dysprosium manganese steel material and preparation method thereof for a kind of bearing, this alloy material has advantages of that yield strength is high, shock-resistant, wear-resisting, heat is strong high.
Technical scheme of the present invention is as follows:
A tungstenic dysprosium manganese steel material for bearing, is characterized in that: chemical element composition and mass percent thereof that it contains are: carbon 1.2-1.4, silicon 1.1-1.3, manganese 8.2-9.4, tungsten 1.3-1.5, Gd0.02-0.04, Dy0.20-0.28, S≤0.04, P≤0.04, surplus are iron.
The production method of tungstenic dysprosium manganese steel material for described bearing, is characterized in that:
(1), preparing the pig iron and scrap iron originates as ferrous substrate in 1:0.5-1 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) manganese; (2) silicon, Dd; (3) other remaining components; The timed interval that each batch drops into element is 22-25 minute, after feeding intake, stirs.
Described casting postheat treatment is: first by room temperature, with 180-190 ℃/h of speed, be warming up to 500-510 ℃, insulation 60-70 minute, with 180-190 ℃/h of speed, be warming up to 700-710 ℃ again, with 150-160 ℃/h of speed, be cooled to 600-610 ℃ again, with 170-180 ℃/h of speed, be warming up to 890-900 ℃ again, insulation 3-4 hour; With 150-160 ℃/h of speed, be cooled to 600-610 ℃ again, then be warming up to 700-710 ℃ with 200-210 ℃/h of speed, then be cooled to 500-510 ℃ with 150-160 ℃/h of speed, insulation 70-80 minute; With 150-160 ℃/h of speed, be cooled to 220-230 ℃ again, insulation 2-3 hour; With 200-210 ℃/h of speed, be warming up to 300-310 ℃ again, then be cooled to 200-210 ℃ with 150-160 ℃/h of speed, then be warming up to 510-520 ℃ with 180-190 ℃/h of speed, insulation 2-3 hour, takes out air cooling and get final product.
Described refining agent is made by the raw material of following weight part: instrument comminuted steel shot 30-34, aluminium hydroxide 2-3, calcite 4-5, zinc sulfate 1-2, medical stone 1-2, montmorillonite 1-2, jade 2-3, Tremoliteor Tremoliteasbestos 3-4, Calcium Fluoride (Fluorspan) 1-2, Sodium Silicofluoride 4-5; Preparation method mixes each raw material, is heated to molten state, then, is poured into Quench in pure water, then is ground into 100-200 order powder; Gained powder is added and is equivalent to the silane resin acceptor kh-550 of powder weight 2-3%, the nano-carbon powder of 1-2%, after mixing, under 8-15Mpa, be pressed into base, then, at 900-950 ℃, calcine 3-4 hour, cooling after, be ground into again 150-250 order powder, obtain.
Beneficial effect of the present invention
The present invention, by using W elements, rare earth element Dy, Gd, makes the advantages such as manganese steel has good toughness compared with existing steel grade, and yield strength is high, and work hardening capacity is high, and wear resisting property is better.Manganese steel of the present invention is suitable for the preparation component that particularly gouging abrasion operating mode is used that wear and tear, as mammoth pump bearing etc., and long service life, safety coefficient is high.The present invention uses part scrap iron as raw material, and through secondary refining, rationally controls casting postheat treatment temperature, and throwing raw materials, makes more stable uniform of alloy quality in batches, improves comprehensive mechanical property.Refining agent of the present invention is for Foundry Production, and the degree of porosity obviously improving in yield rate, particularly foundry goods reduces 1-2 degree, can not produce pore at cast(ing) surface, and trapped oxide also obviously reduces, and oxide inclusion is 2 grades of left and right.
Embodiment
A tungstenic dysprosium manganese steel material for bearing, chemical element composition and mass percent thereof that it contains are: carbon 1.2-1.4, silicon 1.1-1.3, manganese 8.2-9.4, tungsten 1.3-1.5, Gd0.02-0.04, Dy0.20-0.28, S≤0.04, P≤0.04, surplus are iron.
Described bearing by the production method of tungstenic dysprosium manganese steel material is:
(1), preparing the pig iron and scrap iron originates as ferrous substrate in 1:0.8 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) manganese; (2) silicon, Dd; (3) other remaining components; The timed interval that each batch drops into element is 24 minutes, after feeding intake, stirs.
Described casting postheat treatment is: first by room temperature, with 185 ℃/h of speed, be warming up to 505 ℃, be incubated 65 minutes, then be warming up to 705 ℃ with 185 ℃/h of speed, then be cooled to 605 ℃ with 155 ℃/h of speed, with 175 ℃/h of speed, be warming up to 895 ℃ again, be incubated 3.5 hours; With 155 ℃/h of speed, be cooled to 605 ℃ again, then be warming up to 705 ℃ with 205 ℃/h of speed, then be cooled to 505 ℃ with 155 ℃/h of speed, be incubated 75 minutes; With 155 ℃/h of speed, be cooled to 225 ℃ again, be incubated 2.5 hours; With 205 ℃/h of speed, be warming up to 305 ℃ again, then be cooled to 205 ℃ with 155 ℃/h of speed, then be warming up to 515 ℃ with 185 ℃/h of speed, be incubated 2.5 hours, take out air cooling and get final product.
Described refining agent by following weight part (kilogram) raw material make: instrument comminuted steel shot 32, aluminium hydroxide 2.5, calcite 4.5, zinc sulfate 1.5, medical stone 1.5, montmorillonite 1.5, jade 2.6, Tremoliteor Tremoliteasbestos 3.5, Calcium Fluoride (Fluorspan) 1.5, Sodium Silicofluoride 4.5; Preparation method mixes each raw material, is heated to molten state, then, is poured into Quench in pure water, then is ground into 150 order powder; Gained powder is added and is equivalent to the silane resin acceptor kh-550 of powder weight 2.4%, 1.5% nano-carbon powder, after mixing, under 12Mpa, be pressed into base, then, at 930 ℃, calcine 3.5 hours, cooling after, then be ground into 200 order powder, obtain.
Bearing of the present invention by the mechanical property of tungstenic dysprosium manganese steel material is: tensile strength 1298MPa, yield strength 945MPa, unit elongation 13.8%, relative reduction in area 18.2%, impact absorbing energy 52.2J, impelling strength 63.1J/cm2, hardness 294HB.
Claims (4)
1. a tungstenic dysprosium manganese steel material for bearing, is characterized in that: chemical element composition and mass percent thereof that it contains are: carbon 1.2-1.4, silicon 1.1-1.3, manganese 8.2-9.4, tungsten 1.3-1.5, Gd0.02-0.04, Dy0.20-0.28, S≤0.04, P≤0.04, surplus are iron.
2. the production method of tungstenic dysprosium manganese steel material for bearing according to claim 1, is characterized in that:
(1), preparing the pig iron and scrap iron originates as ferrous substrate in 1:0.5-1 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) manganese; (2) silicon, Dd; (3) other remaining components; The timed interval that each batch drops into element is 22-25 minute, after feeding intake, stirs.
3. the production method of tungstenic dysprosium manganese steel material for bearing according to claim 2, it is characterized in that: described casting postheat treatment is: first by room temperature, with 180-190 ℃/h of speed, be warming up to 500-510 ℃, insulation 60-70 minute, with 180-190 ℃/h of speed, be warming up to 700-710 ℃ again, with 150-160 ℃/h of speed, be cooled to 600-610 ℃ again, with 170-180 ℃/h of speed, be warming up to 890-900 ℃ again, insulation 3-4 hour; With 150-160 ℃/h of speed, be cooled to 600-610 ℃ again, then be warming up to 700-710 ℃ with 200-210 ℃/h of speed, then be cooled to 500-510 ℃ with 150-160 ℃/h of speed, insulation 70-80 minute; With 150-160 ℃/h of speed, be cooled to 220-230 ℃ again, insulation 2-3 hour; With 200-210 ℃/h of speed, be warming up to 300-310 ℃ again, then be cooled to 200-210 ℃ with 150-160 ℃/h of speed, then be warming up to 510-520 ℃ with 180-190 ℃/h of speed, insulation 2-3 hour, takes out air cooling and get final product.
4. the production method of tungstenic dysprosium manganese steel material for bearing according to claim 2, is characterized in that: described refining agent is made by the raw material of following weight part: instrument comminuted steel shot 30-34, aluminium hydroxide 2-3, calcite 4-5, zinc sulfate 1-2, medical stone 1-2, montmorillonite 1-2, jade 2-3, Tremoliteor Tremoliteasbestos 3-4, Calcium Fluoride (Fluorspan) 1-2, Sodium Silicofluoride 4-5; Preparation method mixes each raw material, is heated to molten state, then, is poured into Quench in pure water, then is ground into 100-200 order powder; Gained powder is added and is equivalent to the silane resin acceptor kh-550 of powder weight 2-3%, the nano-carbon powder of 1-2%, after mixing, under 8-15Mpa, be pressed into base, then, at 900-950 ℃, calcine 3-4 hour, cooling after, be ground into again 150-250 order powder, obtain.
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Citations (7)
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| CN1380435A (en) * | 2002-05-24 | 2002-11-20 | 董元宇 | High-strength high-impact toughness bearing steel and its heat treatment process |
| CN1888116A (en) * | 2006-08-04 | 2007-01-03 | 钢铁研究总院 | High hardness and high wear resistance no-magnetism bearing steel |
| CN100999801A (en) * | 2007-01-15 | 2007-07-18 | 侯贵敏 | Anti-heat wear-resisting lubricating reducing wear alloy casting steel material |
| CN102242314A (en) * | 2011-01-17 | 2011-11-16 | 王军祥 | Multiple alloy toughened and wear-resistant middle-manganese steel and preparation technology thereof |
| CN102409138A (en) * | 2011-10-31 | 2012-04-11 | 芜湖山桥铁路器材有限公司 | Process for manufacturing alloy steel for rail frog |
| CN102639736A (en) * | 2009-11-30 | 2012-08-15 | 杰富意钢铁株式会社 | Bearing steel |
| CN103146879A (en) * | 2013-02-04 | 2013-06-12 | 安徽省繁昌县皖南阀门铸造有限公司 | Steelmaking refining agent containing modified smectite powder and preparation method thereof |
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2013
- 2013-11-12 CN CN201310558344.XA patent/CN103643113A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1380435A (en) * | 2002-05-24 | 2002-11-20 | 董元宇 | High-strength high-impact toughness bearing steel and its heat treatment process |
| CN1888116A (en) * | 2006-08-04 | 2007-01-03 | 钢铁研究总院 | High hardness and high wear resistance no-magnetism bearing steel |
| CN100999801A (en) * | 2007-01-15 | 2007-07-18 | 侯贵敏 | Anti-heat wear-resisting lubricating reducing wear alloy casting steel material |
| CN102639736A (en) * | 2009-11-30 | 2012-08-15 | 杰富意钢铁株式会社 | Bearing steel |
| CN102242314A (en) * | 2011-01-17 | 2011-11-16 | 王军祥 | Multiple alloy toughened and wear-resistant middle-manganese steel and preparation technology thereof |
| CN102409138A (en) * | 2011-10-31 | 2012-04-11 | 芜湖山桥铁路器材有限公司 | Process for manufacturing alloy steel for rail frog |
| CN103146879A (en) * | 2013-02-04 | 2013-06-12 | 安徽省繁昌县皖南阀门铸造有限公司 | Steelmaking refining agent containing modified smectite powder and preparation method thereof |
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