CN103627996A - High-chromium rare-earth alloy steel hammerhead material and preparation method thereof - Google Patents
High-chromium rare-earth alloy steel hammerhead material and preparation method thereof Download PDFInfo
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- CN103627996A CN103627996A CN201310555668.8A CN201310555668A CN103627996A CN 103627996 A CN103627996 A CN 103627996A CN 201310555668 A CN201310555668 A CN 201310555668A CN 103627996 A CN103627996 A CN 103627996A
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Abstract
The invention relates to a high-chromium rare-earth alloy steel hammerhead material which contains the following chemical elements in percentage by mass: 2.7-2.9% of carbon, 1.2-1.5% of silicon, 5.4-5.8% of manganese, 8.7-9.1% of chromium, 2.0-2.3% of molybdenum, 1.2-1.5% of nickel, 0.02-0.05% of copper, 0.2-0.4% of aluminum, 0.09-0.12% of Nb, 0.03-0.05% of Sc, at most 0.05% of S, at most 0.05% of P and the balance of iron. By using high-carbon steel as the raw material and containing high chromium and trace amounts of Sc, Nb, aluminum and many other alloy elements, the material has the advantages of very high initial hardness, very high wear resistance, favorable corrosion resistance and favorable toughness; the material is suitable for working conditions with severe impact, and used for a large-size crusher hammerhead of which the feed particle size is higher than 400mm; and the service life of the material is enhanced by 1-2 times as compared with the traditional high-manganese steel. When the refining agent is used for casting production, the yield is obviously enhanced.
Description
Technical field
The present invention relates to wear-resistant metal material field, relate in particular to a kind of high chromium rare earth alloy steel hammer head material and preparation method thereof.
Background technology
The kind of hammer head material is a lot, the most frequently used is high mangaenese steel, be at first because of its hardness and wear resistance all higher, but it is found that now that actually this is not so, some occasion high mangaenese steel tup is not wear-resisting, and work-ing life is short, traces it to its cause, that high mangaenese steel will be in the situation that large surging force could produce the cementation zone of high rigidity, and not wear-resisting in the little situation of surging force; Also have Medium Manganese Steel tup, because it has higher hardness and toughness, more durable in the situation that surging force is not too large, and be magnetic; Rich chromium cast iron tup has good wear resistance, but toughness is poor, and brittle rupture easily occurs.Various materials all can not reach optimal effect, so the material of reasonable, develop simple and practical technique, are guaranteeing saving resource and the energy under the prerequisite of service requirements, have become focus and the difficult point in high-abrasive material field.
Summary of the invention
The object of the present invention is to provide a kind of high chromium rare earth alloy steel hammer head material and preparation method thereof, it is high that this alloy material has original hardness, and wear resistance is good, corrosion-resistant, the good advantage of toughness.
Technical scheme of the present invention is as follows:
A high chromium rare earth alloy steel hammer head material, is characterized in that: chemical element composition and mass percent thereof that it contains are: carbon 2.7-2.9, silicon 1.2-1.5, manganese 5.4-5.8, chromium 8.7-9.1, molybdenum 2.0-2.3, nickel 1.2-1.5, copper 0.02-0.05, aluminium 0.2-0.4, Nb0.09-0.12, Sc0.03-0.05, S≤0.05, P≤0.05, surplus are iron.
The production method of described high chromium rare earth alloy steel hammer head material, is characterized in that:
(1), preparing the pig iron and scrap iron originates as ferrous substrate in 1:1-1.5 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) molybdenum, copper, Nb; (2) silicon, chromium; (3) manganese, Sc; The timed interval that each batch drops into element is 23-26 minute, after feeding intake, stirs.
Described casting postheat treatment is: first by room temperature, with 180-190 ℃/h of speed, be warming up to 400-410 ℃, insulation 60-70 minute, with 180-190 ℃/h of speed, be warming up to 700-710 ℃ again, with 160-170 ℃/h of speed, be cooled to 550-570 ℃ again, with 210-220 ℃/h of speed, be warming up to 940-950 ℃ again, insulation 3-4 hour; With 160-170 ℃/h of speed, be cooled to 600-610 ℃ again, then be warming up to 700-710 ℃ with 180-190 ℃/h of speed, then be cooled to 500-510 ℃ with 160-170 ℃/h of speed, insulation 50-60 minute; With 160-170 ℃/h of speed, be cooled to 220-230 ℃ again, insulation 2-3 hour; With 180-190 ℃/h of speed, be warming up to 340-350 ℃ again, then be cooled to 240-250 ℃ with 160-170 ℃/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 30-40, sodium sulfate 2-3, potassium aluminium sulfate 1-2, silicon-dioxide 3-4, BaCO3 2-3, vermiculite power 1-2, Starso 1-2, precipitated silica 3-4, jade powder 3-4, montmorillonite 1-2; 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 adopts high carbon steel as material, meanwhile, because it contains higher chromium and the micro-multiple alloying element of Sc, Nb, aluminium, has very high original hardness and wear resistance again, and simultaneously corrosion-resistant, toughness is also better; The present invention is applicable to the working conditions of intense impact, the Large Crusher tup for feed size more than 400mm, and improve 1-2 doubly with traditional high mangaenese steel phase specific energy its work-ing life.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 high chromium rare earth alloy steel hammer head material, chemical element composition and mass percent thereof that it contains are: carbon 2.7-2.9, silicon 1.2-1.5, manganese 5.4-5.8, chromium 8.7-9.1, molybdenum 2.0-2.3, nickel 1.2-1.5, copper 0.02-0.05, aluminium 0.2-0.4, Nb0.09-0.12, Sc0.03-0.05, S≤0.05, P≤0.05, surplus are iron.
The production method of described high chromium rare earth alloy steel hammer head material is:
(1), preparing the pig iron and scrap iron originates as ferrous substrate in 1:1.3 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) molybdenum, copper, Nb; (2) silicon, chromium; (3) manganese, Sc; 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 405 ℃, be incubated 65 minutes, then be warming up to 705 ℃ with 185 ℃/h of speed, then be cooled to 560 ℃ with 165 ℃/h of speed, with 215 ℃/h of speed, be warming up to 945 ℃ again, be incubated 3.5 hours; With 165 ℃/h of speed, be cooled to 605 ℃ again, then be warming up to 705 ℃ with 185 ℃/h of speed, then be cooled to 505 ℃ with 165 ℃/h of speed, be incubated 55 minutes; With 165 ℃/h of speed, be cooled to 225 ℃ again, be incubated 2.5 hours; With 185 ℃/h of speed, be warming up to 345 ℃ again, then be cooled to 245 ℃ with 165 ℃/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 35, sodium sulfate 2.5, potassium aluminium sulfate 1.5, silicon-dioxide 3.5, BaCO3 2.5, vermiculite power 1.5, Starso 1.5, precipitated silica 3.5, jade powder 3.5, montmorillonite 1.5; Preparation method mixes each raw material, is heated to molten state, then, is poured into Quench in pure water, then is ground into 160 order powder; Gained powder is added and is equivalent to the silane resin acceptor kh-550 of powder weight 2%, 2% nano-carbon powder, after mixing, under 12Mpa, be pressed into base, then, at 930 ℃, calcine 3.5 hours, cooling after, then be ground into 180 order powder, obtain.
The mechanical property of high chromium rare earth alloy steel hammer head material of the present invention is: tensile strength 1321MPa, yield strength 892MPa, unit elongation 12.4%, relative reduction in area 22%, impact absorbing energy 51J, impelling strength 60J/cm2, hardness 263HB.
Claims (4)
1. a high chromium rare earth alloy steel hammer head material, is characterized in that: chemical element composition and mass percent thereof that it contains are: carbon 2.7-2.9, silicon 1.2-1.5, manganese 5.4-5.8, chromium 8.7-9.1, molybdenum 2.0-2.3, nickel 1.2-1.5, copper 0.02-0.05, aluminium 0.2-0.4, Nb0.09-0.12, Sc0.03-0.05, S≤0.05, P≤0.05, surplus are iron.
2. the production method of high chromium rare earth alloy steel hammer head material according to claim 1, is characterized in that:
(1), preparing the pig iron and scrap iron originates as ferrous substrate in 1:1-1.5 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) molybdenum, copper, Nb; (2) silicon, chromium; (3) manganese, Sc; The timed interval that each batch drops into element is 23-26 minute, after feeding intake, stirs.
3. the production method of high chromium rare earth alloy steel hammer head material 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 400-410 ℃, insulation 60-70 minute, with 180-190 ℃/h of speed, be warming up to 700-710 ℃ again, with 160-170 ℃/h of speed, be cooled to 550-570 ℃ again, with 210-220 ℃/h of speed, be warming up to 940-950 ℃ again, insulation 3-4 hour; With 160-170 ℃/h of speed, be cooled to 600-610 ℃ again, then be warming up to 700-710 ℃ with 180-190 ℃/h of speed, then be cooled to 500-510 ℃ with 160-170 ℃/h of speed, insulation 50-60 minute; With 160-170 ℃/h of speed, be cooled to 220-230 ℃ again, insulation 2-3 hour; With 180-190 ℃/h of speed, be warming up to 340-350 ℃ again, then be cooled to 240-250 ℃ with 160-170 ℃/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 high chromium rare earth alloy steel hammer head material 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 30-40, sodium sulfate 2-3, potassium aluminium sulfate 1-2, silicon-dioxide 3-4, BaCO3 2-3, vermiculite power 1-2, Starso 1-2, precipitated silica 3-4, jade powder 3-4, montmorillonite 1-2; 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 (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102021484A (en) * | 2010-12-15 | 2011-04-20 | 中国铝业股份有限公司 | Material for aluminum electrolysis crust-breaking hammer |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102021484A (en) * | 2010-12-15 | 2011-04-20 | 中国铝业股份有限公司 | Material for aluminum electrolysis crust-breaking hammer |
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》, 28 February 2000 (2000-02-28) * |
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Application publication date: 20140312 |