CN103643138A - Low-carbon manganese steel material for pump shafts and preparation method thereof - Google Patents
Low-carbon manganese steel material for pump shafts and preparation method thereof Download PDFInfo
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- CN103643138A CN103643138A CN201310558318.7A CN201310558318A CN103643138A CN 103643138 A CN103643138 A CN 103643138A CN 201310558318 A CN201310558318 A CN 201310558318A CN 103643138 A CN103643138 A CN 103643138A
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Abstract
A low-carbon manganese steel material for pump shafts comprises the following chemical element components by mass percent: 0.2-0.4% of carbon, 1.2-1.4% of silicon, 6.8-7.1% of manganese, 1.0-1.2% of chromium, 0.4-0.6% of lanthanum, 0.04-0.06% of gadolinium, 0.04-0.06% of Ta, not more than 0.04% of S, not more than 0.04% of P, and the balance of iron. The steel material of the invention is added with elements of rare earth elements, thallium, manganese, and the like on the basis of low-carbon steel; the modified manganese steel, with the proviso that the toughness is not changed, has hardness increased by Vickers hardness HV100-500 when compared with common high manganese steel, has improved impact resistance and wear resistance, has a service life being 3-4 times longer than that of common high manganese steel, is applicable to parts of various pump truck bearings used in impact wear working conditions, and has prolonged service life, and reduced production cost. The method of the invention adopts a refining agent in the casting production, which reduces the degree of porosity in casting by 1-2 degrees, 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 low carbon manganese steel material and preparation method thereof for a kind of pump shaft.
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 low carbon manganese steel material and preparation method thereof for a kind of pump shaft, this alloy material has advantages of high rigidity, shock-resistant, wear resistance good.
Technical scheme of the present invention is as follows:
A pump shaft low carbon manganese steel material, is characterized in that: chemical element composition and mass percent thereof that it contains are: carbon 0.2-0.4, silicon 1.2-1.4, manganese 6.8-7.1, chromium 1.0-1.2, lanthanum 0.4-0.6, gadolinium 0.04-0.06, Ta0.04-0.06, S≤0.04, P≤0.04, surplus are iron.
The production method of low carbon manganese steel material for described pump shaft, is characterized in that:
(1), preparing the pig iron and scrap iron originates as ferrous substrate in 1:1-2 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) silicon, manganese; (2) chromium, Ta; (3) other remaining components; The timed interval that each batch drops into element is 21-24 minute, after feeding intake, stirs.
Described casting postheat treatment is: first by room temperature, with 200-210 ℃/h of speed, be warming up to 500-510 ℃, insulation 60-70 minute, with 200-210 ℃/h of speed, be warming up to 700-710 ℃ again, insulation 60-70 minute, with 170-180 ℃/h of speed, be warming up to 900-910 ℃ again, insulation 3-4 hour; With 150-160 ℃/h of speed, be cooled to 700-710 ℃ again, insulation 70-80 minute; With 150-160 ℃/h of speed, be cooled to 500-510 ℃ again, insulation 60-70 minute, then with 150-160 ℃/h of speed, be cooled to 180-190 ℃, 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 530-540 ℃ 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 on the basis of middle low carbon steel by having added the elements such as rare earth element, thallium, manganese, this modification manganese steel is keeping under the constant prerequisite of snappiness, the comparable common high mangaenese steel of hardness improves vickers hardness hv 100～500, shock resistance and wear resisting property have been improved, be 3 to 4 times of common high mangaenese steel its work-ing life, the component of using for gouging abrasion operating modes such as various pump truck bearings, and extend work-ing life, reduce production cost, saved the energy; 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 pump shaft low carbon manganese steel material, chemical element composition and mass percent thereof that it contains are: carbon 0.2-0.4, silicon 1.2-1.4, manganese 6.8-7.1, chromium 1.0-1.2, lanthanum 0.4-0.6, gadolinium 0.04-0.06, Ta0.04-0.06, S≤0.04, P≤0.04, surplus are iron.
Described pump shaft by the production method of low carbon manganese steel material is:
(1), preparing the pig iron and scrap iron originates as ferrous substrate in 1:1.5 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) silicon, manganese; (2) chromium, Ta; (3) other remaining components; The timed interval that each batch drops into element is 23 minutes, after feeding intake, stirs.
Described casting postheat treatment is: first by room temperature, with 205 ℃/h of speed, be warming up to 505 ℃, be incubated 65 minutes, then be warming up to 705 ℃ with 205 ℃/h of speed, be incubated 65 minutes, then be warming up to 905 ℃ with 175 ℃/h of speed, be incubated 3.5 hours; With 155 ℃/h of speed, be cooled to 705 ℃ again, be incubated 75 minutes; With 155 ℃/h of speed, be cooled to 505 ℃ again, be incubated 65 minutes, then be cooled to 185 ℃ with 155 ℃/h of speed, 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 535 ℃ 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.
Pump shaft of the present invention by the mechanical property of low carbon manganese steel material is: tensile strength 1269MPa, yield strength 938MPa, unit elongation 15%, relative reduction in area 31%, impact absorbing energy 53.5J, impelling strength 60.9J/cm2, hardness 248.6HB.
Claims (4)
1. a pump shaft low carbon manganese steel material, is characterized in that: chemical element composition and mass percent thereof that it contains are: carbon 0.2-0.4, silicon 1.2-1.4, manganese 6.8-7.1, chromium 1.0-1.2, lanthanum 0.4-0.6, gadolinium 0.04-0.06, Ta0.04-0.06, S≤0.04, P≤0.04, surplus are iron.
2. the production method of low carbon manganese steel material for pump shaft according to claim 1, is characterized in that:
(1), preparing the pig iron and scrap iron originates as ferrous substrate in 1:1-2 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) silicon, manganese; (2) chromium, Ta; (3) other remaining components; The timed interval that each batch drops into element is 21-24 minute, after feeding intake, stirs.
3. the production method of low carbon manganese steel material for pump shaft according to claim 2, it is characterized in that: described casting postheat treatment is: first by room temperature, with 200-210 ℃/h of speed, be warming up to 500-510 ℃, insulation 60-70 minute, with 200-210 ℃/h of speed, be warming up to 700-710 ℃ again, insulation 60-70 minute, with 170-180 ℃/h of speed, be warming up to 900-910 ℃ again, insulation 3-4 hour; With 150-160 ℃/h of speed, be cooled to 700-710 ℃ again, insulation 70-80 minute; With 150-160 ℃/h of speed, be cooled to 500-510 ℃ again, insulation 60-70 minute, then with 150-160 ℃/h of speed, be cooled to 180-190 ℃, 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 530-540 ℃ with 180-190 ℃/h of speed, insulation 2-3 hour, takes out air cooling and get final product.
4. the production method of low carbon manganese steel material for pump shaft 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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| CN201310558318.7A CN103643138A (en) | 2013-11-12 | 2013-11-12 | Low-carbon manganese steel material for pump shafts and preparation method thereof |
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| CN201310558318.7A CN103643138A (en) | 2013-11-12 | 2013-11-12 | Low-carbon manganese steel material for pump shafts and preparation method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104213050A (en) * | 2014-08-05 | 2014-12-17 | 安徽荣达阀门有限公司 | Manganese steel material for pump shaft and preparation method thereof |
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| JPH03236202A (en) * | 1990-02-14 | 1991-10-22 | Tdk Corp | Sintered permanent magnet |
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| JPH04268050A (en) * | 1991-02-22 | 1992-09-24 | Dowa Mining Co Ltd | R-fe-b-c permanent magnet alloy reduced in irreversible demagnetization and excellent in heat stability |
| 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 |
| CN102653809A (en) * | 2012-03-16 | 2012-09-05 | 张晖 | Composite refining agent for metallurgy and processing technique thereof |
| CN103060678A (en) * | 2012-12-25 | 2013-04-24 | 钢铁研究总院 | Medium temperature deformation nanometer austenite enhanced plasticized steel and preparation method thereof |
| CN103088199A (en) * | 2011-11-04 | 2013-05-08 | 上海重型机器厂有限公司 | Heat treatment method after forging for forged steel bearing roller used for large heavy plate mill |
| CN103147018A (en) * | 2013-03-26 | 2013-06-12 | 无锡市派克重型铸锻有限公司 | Austenitic stainless steel forging and production process thereof |
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2013
- 2013-11-12 CN CN201310558318.7A patent/CN103643138A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03236202A (en) * | 1990-02-14 | 1991-10-22 | Tdk Corp | Sintered permanent magnet |
| JPH04268050A (en) * | 1991-02-22 | 1992-09-24 | Dowa Mining Co Ltd | R-fe-b-c permanent magnet alloy reduced in irreversible demagnetization and excellent in heat stability |
| CN1064319A (en) * | 1991-12-07 | 1992-09-09 | 天津大学 | Iron-based rare-earth mamem |
| 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 |
| CN103088199A (en) * | 2011-11-04 | 2013-05-08 | 上海重型机器厂有限公司 | Heat treatment method after forging for forged steel bearing roller used for large heavy plate mill |
| CN102653809A (en) * | 2012-03-16 | 2012-09-05 | 张晖 | Composite refining agent for metallurgy and processing technique thereof |
| CN103060678A (en) * | 2012-12-25 | 2013-04-24 | 钢铁研究总院 | Medium temperature deformation nanometer austenite enhanced plasticized steel and preparation method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104213050A (en) * | 2014-08-05 | 2014-12-17 | 安徽荣达阀门有限公司 | Manganese steel material for pump shaft and preparation method thereof |
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Application publication date: 20140319 |