CN103589958A - High-performance high-speed tool steel for tap manufacture and preparation technology thereof - Google Patents
High-performance high-speed tool steel for tap manufacture and preparation technology thereof Download PDFInfo
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- CN103589958A CN103589958A CN201310643038.6A CN201310643038A CN103589958A CN 103589958 A CN103589958 A CN 103589958A CN 201310643038 A CN201310643038 A CN 201310643038A CN 103589958 A CN103589958 A CN 103589958A
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Abstract
The invention discloses high-performance high-speed tool steel for tap manufacture and a preparation technology thereof. The high-performance high-speed tool steel comprises, by weight, 0.90-0.98% of C, 6.90-7.20% of W, 4.00-4.30% of Mo, 4.30-4.60% of Cr, 2.30-2.50% of V, 0.20-0.40% of Mn, 0.20-0.50% of Si, 0.3-0.50% of Ti, 0.08-0.15% of Nb, 0.03-0.08% of N, 0.10-0.2% of RE, less than or equal to 0.03% of P, less than or equal to 0.03% of S and the balance Fe. A consumable electrode is smelted by a middle-frequency induction furnace and then a high-speed steel bar is smelted by electro-slag remelting. Compared with the prior art, the preparation technology has the advantages that through use of a small amount of Nb and Ti, improvement of V content and inoculation treatment adopting rare earth, hardness, red hardness, impact toughness, resistance to adhesion to a cutter, and a cutting life of the high-speed steel are improved, a cobalt alloy use amount is reduced and a cost is reduced. The high-performance high-speed tool steel for tap manufacture and the preparation technology have good economic and social benefits.
Description
Technical field
The invention belongs to cutting cutlery high speed steel material technical field, relate to a kind of screw tap rapid tool steel, particularly a kind of high-performance rapid tool steel and preparation technology thereof for the manufacture of screw tap.
Background technology
Tapper tap is the class screw tap for tapping internal thread, and it belongs to a kind of of cutting tool.The material that tradition is used is rapid steel, and wherein in the majority with W6Mo5Cr4V2, this class steel has good red hardness and wear resistance, occupies very consequence in modern cutter material.But along with scientific and technological development, that particularly novel material is studied gos deep into, and people have higher requirement to cutlery material, and hope can make the mechanical property of cutlery under normal temperature and high temperature be significantly improved.
In recent years, from the consideration of enhancing productivity, the existing trend from rapid steel to superhard alloy Materials of cutter material, cobalt rapid tool steel as superhard in the M42 of U.S.'s trade mark, M42 steel is a kind of very hard high-speed tool steel, hardness is high, can reach 70HRC, thermohardening is good, hot hardness is high, easily grinding, and its obdurability and workability exceed a class than superhard materials such as Wimet, be mainly used in making the instrument of cutting difficult-to-machine material (as various heat-resisting, non-corrosive metals etc.), as depth drill, broaching tool, screw tap, milling cutter, hobboing cutter etc.
The massfraction of vanadium not high (1%) in M42 steel, the massfraction high (8%) of cobalt, cobalt can impel carbide to be dissolved in more in matrix when quenching heating, utilizes high matrix hardness to improve wear resistance.But Chinese cobalt resource lacks, the price increase of cobalt, becomes the major reason that superhard cutter cost improves, and causes Cobalt High Speed Steel expensive, is about 5～8 times of common rapid steel.In addition, the toughness of superhard alloy drill bit is lower than High Speed Steel Bit, for preventing tipping, need to carry out the chamfering mill that spreads out and process.For this reason, cutting resistance increases, and cutter sharpness is poor, produces burr and the problem that is unsuitable for work hardening material.
Super-hard high-speed steel is in order to adapt to difficult processing cutting material, as the needs of refractory alloy etc., on the basis of comprehensive high-carbon high-high-vanadium high-speed steel and high-carbon high-cobalt high speed steel advantage, grows up.Drill bit, as an important component part in cutter for mechanical workout, is mainly used in the roughing in hole.Along with the development of machinery industry, the consumption of drill bit grows with each passing day, especially major diameter drill bit.But the price of bar rises steadily, to processing industry, brought huge cost pressure.Therefore Low-cost not cobalt-containing super-hard high-speed steel there is good economic and social benefit.
Summary of the invention
The object of the invention is for the existing above-mentioned deficiency of existing super-hard high-speed steel, a kind of high-performance rapid tool steel and preparation technology thereof for the manufacture of screw tap who does not contain the high-performance and low-cost that cobalt amount is low is provided.
In order to solve the problems of the technologies described above, the present invention can realize by design and the technology of following chemical composition:
Its mass percent proportioning of a kind of high-performance rapid tool steel for the manufacture of screw tap provided by the present invention is: the present invention has adopted following technical scheme:
A high-performance rapid tool steel for screw tap, the component that it contains following weight percent: C:0.90-0.98%; W:6.90-7.20%; Mo:4.00-4.30%; Cr:4.30-4.60%; V:2.30-2.50%; Mn:0.20-0.40%; Si:0.20-0.50; Ti:0.3-0.50%; Nb:0.08-0.15%; N:0.03～0.08%; RE:0.10-0.2%; P :≤0.03%; S :≤0.03%; All the other are Fe.
High-performance rapid tool steel for the manufacture of screw tap provided by the present invention, its step of preparation process is:
1, in, quite consumable electrode is prepared in induction furnace smelting:
Adopt alkaline crucible to smelt, by ferro-tungsten, ferro-molybdenum, high-carbon chrome alloy and steel scrap or waste and old rapid steel returns and steel scrap are according to required composition metering preparation, first pack steel scrap or waste and old rapid steel returns into intermediate frequency furnace crucible bottom, top at returns reinstalls high-carbon chrome alloy, then on the top of crucible, reinstall 1/3rd ferro-tungsten and ferro-molybdenum and required steel scrap, power transmission heating, after bottom furnace charge starts fusing, the ferrotungsten and the molybdenum-iron that add successively surplus in batches, 1500 ℃ of left and right, molten clear rear inspection furnace bottom adds appropriate lime and fluorite slag making after smelting furnace material invariably, adjust slag composition and improve slag fluidity, with silicon calcium powder, carry out after diffusive deoxidation, adjusting component, after rising to 1600 ℃, temperature adds vanadium iron and ferrotianium, after alloying, carry out final deoxygenation, skim, molten steel tapping temperature is 1600 ℃-1620 ℃, rare earth is placed on to ladle bottom, molten steel is poured in ladle to adopt and pour method rapid steel is carried out to rare earth inoculation, as-cast structure and carbide with refinement rapid steel, after standing, slag hitting, then carry out external refining+vacuum outgas, wherein, during outside-stove refining dephosphorization, molten steel passes into stirring of inert gas under vacuum state, control nitrogen content " N]≤150ppm, finally temperature is controlled to 1500 ℃～1510 ℃ and is cast into consumable electrode,
2, electric slag refusion and smelting is manufactured rapid steel bar
The consumable electrode of having cast is carried out to the electroslag ingot that electroslag casting becomes desired size.
Beneficial effect
Compare with the M42 steel of present consumption maximum, the present invention has the following advantages:
(1) owing to having added a small amount of niobium in steel of the present invention, niobium can generate very tiny niobium carbide particle in steel, hinders grain growth, makes the grain fineness number after steel quench thinner, and quenching temperature scope is wider, thus the toughness of steel and thermoplasticity all better.Simultaneously by after content of vanadium is brought up to 2.3～2.50%, the grindability when having guaranteed the wear resistance of cutter and having manufactured cutter.
(2) by add rare earth in rapid steel, make the austenite crystal of rapid steel and eutectic structure obviously obtain refinement, in eutectic structure, sheet carbide shortens, attenuates.After thermal treatment, the most of turn agglomerate of eutectic carbides is spherical and be evenly distributed, and hardness and redhardneas and the impelling strength of rapid steel are all improved.Thereby by the adjustment of mentioned component, reduced the content of cobalt.
(3) in rapid steel, add Ti carbide, can in process of setting, form a massive carbide of a large amount of disperses, the netted eutectic carbides of Substitute For Partial, pattern and the distribution of carbide are improved, make the dendritic structure of rapid steel obtain refinement, in solidified structure, isolated block MC type carbide increases, and crystal boundary eutectic carbides amount reduces.In addition, appropriate Ti also can improve the hardness after rapid steel thermal treatment, very useful to the wear resistance of raising rapid steel.
(4) because the cobalt contents in steel of the present invention reduces, thereby reduced the smelting cost of steel, and added the effect of other alloying element, further improved the hot-workability of steel, improved lumber recovery, total production cost also decreases.
Embodiment
Below in conjunction with embodiment, the invention will be further described.
Embodiment mono-
A high-performance rapid tool steel for screw tap, the component of this material weight per-cent: C:0.90%; W:7.00%; Mo:4.10%; Cr:4.40%; V:2.40%; Mn:0.35%; Si:0.25%; Ti:0.3%; Nb:0.10%; N:0.05%; RE:0.10%; P :≤0.02%; S :≤0.02%; All the other are Fe.
Its preparation method, comprises following process:
1, in, quite consumable electrode is prepared in induction furnace smelting:
Adopt alkaline crucible to smelt, by ferro-tungsten, ferro-molybdenum, high-carbon chrome alloy and steel scrap or waste and old rapid steel returns and steel scrap are according to required composition metering preparation, first pack steel scrap or waste and old rapid steel returns into intermediate frequency furnace crucible bottom, top at returns reinstalls high-carbon chrome alloy, then on the top of crucible, reinstall 1/3rd ferro-tungsten and ferro-molybdenum and required steel scrap, power transmission heating, after bottom furnace charge starts fusing, the ferrotungsten and the molybdenum-iron that add successively surplus in batches, 1500 ℃ of left and right, molten clear rear inspection furnace bottom adds appropriate lime and fluorite slag making after smelting furnace material invariably, adjust slag composition and improve slag fluidity, with silicon calcium powder, carry out after diffusive deoxidation, adjusting component, after rising to 1600 ℃, temperature adds vanadium iron and ferrotianium, after alloying, carry out final deoxygenation, skim, molten steel tapping temperature is 1600 ℃-1620 ℃, rare earth is placed on to ladle bottom, molten steel is poured in ladle to adopt and pour method rapid steel is carried out to rare earth inoculation, as-cast structure and carbide with refinement rapid steel, after standing, slag hitting, then carry out external refining+vacuum outgas, wherein, during outside-stove refining dephosphorization, molten steel passes into stirring of inert gas under vacuum state, control nitrogen content " N]≤150ppm, finally temperature is controlled to 1500 ℃～1510 ℃ and is cast into consumable electrode,
2, electric slag refusion and smelting is manufactured rapid steel bar
The consumable electrode of having cast is carried out to the electroslag ingot that electroslag casting becomes desired size.
Embodiment bis-:
A cut drill rapid tool steel, the component of this material weight per-cent: C:0.95%; W:7.100%; Mo:4.20%; Cr:4.50%; V:2.40%; Mn:0.30%; Si:0.35%; Ti:0.40%; Nb:0.12%; N:0.07%; RE:0.15%; P :≤0.02%; S :≤0.02%; All the other are Fe.
Its preparation method is with embodiment mono-.Slightly.
Embodiment tri-:
A cut drill rapid tool steel, the component of this material weight per-cent: C:0.99%; W:7.20%; Mo:4.30%; Cr4.50%; V:2.50%; Mn:0.40%; Si:0.50%; Ti:0.4%; Nb:0.15%; N:0.05%; RE:0.10%; P :≤0.02%; S :≤0.02%; All the other are Fe.
Its preparation method is with embodiment mono-.Slightly.
Claims (2)
1. for the manufacture of high-performance rapid tool steel and the preparation technology thereof of screw tap, it is characterized in that: the component that it contains following weight percent: C:0.90-0.98%; W:6.90-7.20%; Mo:4.00-4.30%; Cr:4.30-4.60%; V:2.30-2.50%; Mn:0.20-0.40%; Si:0.20-0.50; Ti:0.3-0.50%; Nb:0.08-0.15%; N:0.03～0.08%; RE:0.10-0.2%; P :≤0.03%; S :≤0.03%; All the other are Fe.
2. according to low-cobalt very hard high-speed tool steel and preparation technology thereof for a kind of cut drill under claim 1, it is characterized in that its step of preparation process is:
1) in, quite consumable electrode is prepared in induction furnace smelting:
Adopt alkaline crucible to smelt, by ferro-tungsten, ferro-molybdenum, high-carbon chrome alloy and steel scrap or waste and old rapid steel returns and steel scrap are according to required composition metering preparation, first pack steel scrap or waste and old rapid steel returns into intermediate frequency furnace crucible bottom, top at returns reinstalls high-carbon chrome alloy, then on the top of crucible, reinstall 1/3rd ferro-tungsten and ferro-molybdenum and required steel scrap, power transmission heating, after bottom furnace charge starts fusing, the ferrotungsten and the molybdenum-iron that add successively surplus in batches, 1500 ℃ of left and right, molten clear rear inspection furnace bottom adds appropriate lime and fluorite slag making after smelting furnace material invariably, adjust slag composition and improve slag fluidity, with silicon calcium powder, carry out after diffusive deoxidation, adjusting component, after rising to 1600 ℃, temperature adds vanadium iron and ferrotianium, after alloying, carry out final deoxygenation, skim, molten steel tapping temperature is 1600 ℃-1620 ℃, rare earth is placed on to ladle bottom, molten steel is poured in ladle to adopt and pour method rapid steel is carried out to rare earth inoculation, as-cast structure and carbide with refinement rapid steel, after standing, slag hitting, then carry out external refining+vacuum outgas, wherein, during outside-stove refining dephosphorization, molten steel passes into stirring of inert gas under vacuum state, control nitrogen content " N]≤150ppm, finally temperature is controlled to 1500 ℃～1510 ℃ and is cast into consumable electrode,
2) electric slag refusion and smelting is manufactured rapid steel bar:
The consumable electrode of having cast is carried out to the electroslag ingot that electroslag casting becomes desired size.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104195440A (en) * | 2014-09-18 | 2014-12-10 | 丹阳惠达模具材料科技有限公司 | Low-cost high-speed tool steel for cutting drill bit and preparation process of low-cost high-speed tool steel |
| CN105648343A (en) * | 2016-03-22 | 2016-06-08 | 安徽科凌仪器有限公司 | High-speed steel for high-strength and wear-resistant cutters |
| CN116837267A (en) * | 2021-11-29 | 2023-10-03 | 河冶科技股份有限公司 | Method for preparing precipitation hardening high-speed steel by spray forming process |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1226609A (en) * | 1999-01-26 | 1999-08-25 | 尹道乐 | Economic high speed steel |
| CN1693527A (en) * | 2005-05-10 | 2005-11-09 | 酒泉钢铁(集团)有限责任公司 | Cobalt less multi element high speed tool steel and its manufacturing method |
| CN102766825A (en) * | 2012-07-05 | 2012-11-07 | 无锡市钻通工程机械有限公司 | Preparation method of high-speed steel for roller |
-
2013
- 2013-12-05 CN CN201310643038.6A patent/CN103589958A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1226609A (en) * | 1999-01-26 | 1999-08-25 | 尹道乐 | Economic high speed steel |
| CN1693527A (en) * | 2005-05-10 | 2005-11-09 | 酒泉钢铁(集团)有限责任公司 | Cobalt less multi element high speed tool steel and its manufacturing method |
| CN102766825A (en) * | 2012-07-05 | 2012-11-07 | 无锡市钻通工程机械有限公司 | Preparation method of high-speed steel for roller |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104195440A (en) * | 2014-09-18 | 2014-12-10 | 丹阳惠达模具材料科技有限公司 | Low-cost high-speed tool steel for cutting drill bit and preparation process of low-cost high-speed tool steel |
| CN105648343A (en) * | 2016-03-22 | 2016-06-08 | 安徽科凌仪器有限公司 | High-speed steel for high-strength and wear-resistant cutters |
| CN116837267A (en) * | 2021-11-29 | 2023-10-03 | 河冶科技股份有限公司 | Method for preparing precipitation hardening high-speed steel by spray forming process |
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Application publication date: 20140219 |