CN105296868A - Wear resisting ultrahard high-speed steel - Google Patents
Wear resisting ultrahard high-speed steel Download PDFInfo
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- CN105296868A CN105296868A CN201410843817.5A CN201410843817A CN105296868A CN 105296868 A CN105296868 A CN 105296868A CN 201410843817 A CN201410843817 A CN 201410843817A CN 105296868 A CN105296868 A CN 105296868A
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Abstract
The invention discloses wear resisting ultrahard high-speed steel, and belongs to the field of mechanical manufacturing. The wear resisting ultrahard high-speed steel comprises the following components in percentage by mass: 1.2-1.8% of C, 0.5-2.2% of Si, 0.2-0.6% of Mn, 0.6-3.2% of Al, 4.6-7.4% of Cr, 1.5-2.6% of Mo, 2-3.2% of V, 3.3-4.8% of W, 0.3-1.8% of Nb, P not more than 0.03%, S not more than 0.03%, and the balance of Fe. The wear resisting ultrahard high-speed steel decreases W and Mo and adds more Si; the carbide size is reduced through adding Si; the hardness is increased by such special processes as tempering; W and Mo with high cost are decreased, and Si with low cost is added, so that the whole material cost is reduced, the hardness is good, and the wear resistance is strong; and the tempering procedure can be fully performed for materials only by once tempering through batching, so that the labor hour and the energy are saved, and the reliability is excellent.
Description
Technical field
The present invention relates to machine casting field, more particularly, relate to a kind of wear-resisting super-hard high-speed steel.
Background technology
Rapid steel is a kind of tool steel with high rigidity, high-wearing feature and high heat resistance, also known as rapid tool steel or high-speed steel, is commonly called as Bai Gang.Rapid steel is that Taylor F.W. of the U.S. and M. White were in initiative in 1898.The processing performance of rapid steel is good, and intensity and toughness are worked good, and is therefore mainly used to manufacture complicated thin sword and impact-resistant metal cutting tool, also can manufacture high-temperature bearing and cold extrusion die etc.Except the rapid steel produced with melting method, there is again p/m high speed steel in the sixties in 20th century later, and its advantage is that of avoiding smelting process and produces the carbide segregation that causes and cause mechanical property to reduce and heat treatment deformation.Rapid steel is a kind of steel grade of complexity, and carbon content is generally between 0.70 ~ 1.65%.Rapid steel is more containing alloying element amount, and total amount can reach 10 ~ 25%.Can be divided into by contained alloying element difference: 1. tungsten system rapid steel (tungstenic 9 ~ 18%); 2. tungsten molybdenum high speed steel (tungstenic 5 ~ 12%, containing molybdenum 2 ~ 6%); 3. high molybdenum high speed steel (tungstenic 0 ~ 2%, containing molybdenum 5 ~ 10%); 4. vanadium rapid steel, divides again the rapid steel of general vanadiumcontent (containing vanadium 1 ~ 2%) and high vanadiumcontent (containing vanadium 2.5 ~ 5%) by the difference of vanadiumcontent; 5. Cobalt High Speed Steel (containing cobalt 5 ~ 10%).
Also can harden even if cool in atmosphere during alloy high speed steel quenching, and very sharp.It is a kind of steel alloy of complicated component, containing carbide forming elements such as tungsten, molybdenum, chromium, vanadium, cobalts.Alloying element total amount reaches about 10 ~ 25%.Its under high speed cutting produces high enthusiasm condition (about 500 DEG C) still can keep high hardness, and HRC can more than 60.Topmost characteristic-the red hardness of rapid steel that Here it is.Rapid steel is good due to red hardness, compensate for the fatal defects of carbon tool steel, can be used for manufacturing cutting tool.Tungsten system and molybdenum high speed steel are after correct thermal treatment, and Rockwell hardness can reach more than 63, and cobalt system rapid steel is more than 65.Existing rapid steel cost when producing is high, can be in any more, and wear resistance and hardness can not improve always at low cost always.And the thermal treatment process of rapid steel is comparatively complicated, have to pass through a series of processes such as quenching, tempering.Because its poor thermal conductivity is generally carried out in two stages during quenching.First preheating at a certain temperature, in order to avoid cause large thermal stresses, is then heated to quenching temperature rapidly, rear oil cooling or air cooling or inflatable body cooling.Factory all adopts salt stove to heat, and existing vacuum oven uses also quite extensive.Be not transformed into martensite because interior tissue also retains about 30% residual austenite after quenching, have impact on the performance of rapid steel.For making Transformation of Retained Austenite, further improving hardness and wear resistance, generally will carry out 2 ~ 3 tempering, after be incubated.Existing technology is also improved these problems.
Chinese patent application, application number 200910264467.6, December 23 2009 applying date, publication date on May 19th, 2010, disclose wear-resistant high speed steel, the present invention designs a kind of property rapid steel, the property rapid steel that the cutters such as a kind of drill bit screw tap are special, main moiety is C, W, Mo, Cr, V, Mn, Si, Nb, Co, P, S and Fe, and the mass percent of each composition is as follows, C:0.88-0.98%; W:4.3-4.8%; Mo:2.7-3.1%; Cr:3.8-4.3%; V:1.8-2.2%; Mn:0.2-0.4%; Si:1.1-1.5%; Nb:0.08-0.16%; Co:1.2-1.8%; P≤0.03%, S≤0.03%; All the other are Fe.The present invention has a little, reduces the consumption of precious metal tungsten and molybdenum, with the addition of a small amount of niobium and cobalt, to reach the object improving Tool in Cutting performance, but this HSS-like is mainly used in cutter manufacture aspect and is specifically designed to the parts such as brick, and range of application is little, and hardness is not high, limitation is large.
Chinese patent application, application number 201010171962.5, May 10 2010 applying date, publication date on September 22nd, 2010, disclose a kind of rapid steel and production technique thereof, the invention discloses a kind of rapid steel and production technique thereof, contain the mass percentage of chemical composition: C:1.0-1.4%; Cr:3.8-4.2%; Mo:4.8-5.2%; W:6.3-6.5%; V:2.2-3.0%; Nb:0.4-1.5%; Si:1.1-1.5%; ; P≤0.03%, S≤0.03%; Mn :≤0.4%, all the other are Fe and inevitable impurity.Being incorporated into of spray deposition technology creation is prepared rapid steel by the present invention, the shortcoming that his customer service conventional cast blank coarse grains, segregation are serious, abandon again the deficiency that operation is various, energy consumption is high of powder metallurgical technique, have again the advantage of powder metallurgy technology concurrently simultaneously, thus improve the various performances of metallic substance greatly, its advantage is very significantly with outstanding.But this scheme is high to the control overflow between technique, and equipment cost is high, although and generate rapid steel hardness high, cost still can be in any more.
Summary of the invention
1. the technical problem that will solve
, wear resistance high for the rapid steel cost existed in prior art is strong, hardness is low, production technique and production cost high problem, the invention provides a kind of wear-resisting super-hard high-speed steel, it can be implemented in taken into account wear resistance and hardness high when, cost is low, production technique and the simple effect of equipment.
2. technical scheme
Object of the present invention is achieved through the following technical solutions.
A kind of wear-resisting super-hard high-speed steel, described mass ratio is as follows,
C1.2%-1.8%
Si0.5%-2.2%
Mn0.2%-0.6%
Al0.6%-3.2%
Cr4.6%-7.4%
Mo1.5%-2.6%
V2%-3.2%
W3.3-4.8%
Nb0.3-1.8%
P≤0.03%
S≤0.03%
All the other are Fe.
Further, its preferred mass ratio is as follows:
C1.6%
Si1.5%
Mn0.5%
Al1.7%
Cr4.8%
Mo2.1%
V2.3%
W4.2%
Nb1.3%
P≤0.03%
S≤0.03%
All the other are Fe.
Further, described Mn/S > 20.
3. beneficial effect
Compared to prior art, the invention has the advantages that:
(1) to a certain degree adding Cr can make rapid steel at high temperature have antioxidant property, and its hot corrosion resistance improves greatly, and it is combined with C can form hard compounds, makes it have good wear resistance and toughness;
(2) wherein add Al as deoxidant element, steel alloy can be able to be made at high temperature to have good hardness and erosion resistance in the above-mentioned proportioning of employing;
(3) reducing W and Mo, adding than making carbide size reduce, through techniques such as special tempering adding of originally many Si, Si, hardness is increased, is decreasing W and Mo of high cost, adding the Si of low price, integral material cost is reduced, and hardness is good, wear resisting property is strong;
(4) only need the tempering carried out once can carry out tempering process to material fully by proportioning, save man-hour and the energy, good reliability.
Embodiment
Below in conjunction with specific embodiment, the present invention is described in detail.
embodiment 1
A kind of wear-resisting super-hard high-speed steel, described mass ratio is as follows,
C1.2%
Si0.5%
Mn0.6%
Al0.6%
Cr4.6%
Mo2.6%
V3.2%
W4.8%
Nb0.3
P≤0.03%
S≤0.03%
All the other are Fe.
Its preparation process is as follows:
1) required material is carried out proportioning according to aforementioned proportion, steel scrap, Cr iron, Si iron, Mo iron, W iron, Mn iron are mixed in electric furnace and carry out heating and melting;
2) stokehold temperature regulated, temperature is raised to 1620-1650 DEG C, adds Al, adds V iron and Nb iron;
3) Si iron is split be broken to particle and be less than 20mm fritter, carry out 200 DEG C of oven dry, be placed in bottom casting ladle, Metamorphism treatment is carried out to molten steel;
4), time liquid steel temperature arrives 1550-1600 DEG C, foundry goods is poured into;
5) anneal to foundry goods, when annealing, soaking time is 5 hours, and temperature is 830-850 DEG C;
6) carry out Quench and temper, temperature is 1020-1070 DEG C, carries out the tempering of 520-550 DEG C, and tempering only needs to carry out once.
Present invention adds Al as deoxidant element, rapid steel can be made at high temperature to have good hardness in the above-mentioned proportioning of employing, facilitate the effect of secondary hardening, can the effect of Substitute For Partial W.
The Nb of high-content is for increasing the MC type carbide of steel grade, and strengthen the wear resistance of steel, hardness is good, although the too high meeting of Korea Spro two of Nb makes primary grain become large, because the Grain size controlling of the effect carbide of Si is within little scope, its grinding performance is still good, can keep good processing characteristics.
Decrease W and Mo, add Si, the main adding elements W of rapid steel and Mo is the primary carbide in order to form some amount, steel is made to carry out quench hot, improving the wear resistance of steel, form proeutectoid carbide when tempering, is principal element as secondary hardening and the red hardness increasing hardness.Reducing W and Mo, adding than making carbide size reduce, through techniques such as special tempering adding of originally many Si, Si, hardness is increased, is decreasing W and Mo of high cost, adding the Si of low price, integral material cost is reduced, and hardness is good, wear resisting property is strong.
P and S is impurity wherein, can bring the red brittleness of steel, requires that content reduces, and controls it within 0.03%, requires Mn/S > 20.
Only need the tempering carried out once can carry out tempering process to material fully by proportioning, save man-hour and the energy, good reliability.This kind of steel can be used in cutter and casting multiple fields, and excellent cutting performance, surface of high speed steel hardness reaches more than 67HRC.Hardness is good, and wear resistance is good.
embodiment 2
A kind of wear-resisting super-hard high-speed steel, described mass ratio is as follows,
C1.6%
Si1.5%
Mn0.5%
Al1.7%
Cr4.8%
Mo2.1%
V2.3%
W4.2%
Nb1.3%
P≤0.03%
S≤0.03%
All the other are Fe.
Its preparation process is as follows:
1) required material is carried out proportioning according to aforementioned proportion, steel scrap, Cr iron, Si iron, Mo iron, W iron, Mn iron are mixed in electric furnace and carry out heating and melting;
2) stokehold temperature regulated, temperature is raised to 1620-1650 DEG C, adds Al, adds V iron and Nb iron;
3) Si iron is split be broken to particle and be less than 20mm fritter, carry out 200 DEG C of oven dry, be placed in bottom casting ladle, Metamorphism treatment is carried out to molten steel;
4), time liquid steel temperature arrives 1550-1600 DEG C, foundry goods is poured into;
5) anneal to foundry goods, when annealing, soaking time is 5 hours, and temperature is 830-850 DEG C;
6) carry out Quench and temper, temperature is 1020-1070 DEG C, carries out the tempering of 520-550 DEG C, and tempering only needs to carry out once.
embodiment 3
A kind of wear-resisting super-hard high-speed steel, described mass ratio is as follows,
C1.8%
Si2.2%
Mn0.2%
Al3.2%
Cr7.4%
Mo1.5%
V3.2%
W4.8%
Nb1.8%
P≤0.03%
S≤0.03%
All the other are Fe.
Its preparation process is as follows:
1) required material is carried out proportioning according to aforementioned proportion, steel scrap, Cr iron, Si iron, Mo iron, W iron, Mn iron are mixed in electric furnace and carry out heating and melting;
2) stokehold temperature regulated, temperature is raised to 1620-1650 DEG C, adds Al, adds V iron and Nb iron;
3) Si iron is split be broken to particle and be less than 20mm fritter, carry out 200 DEG C of oven dry, be placed in bottom casting ladle, Metamorphism treatment is carried out to molten steel;
4), time liquid steel temperature arrives 1550-1600 DEG C, foundry goods is poured into;
5) anneal to foundry goods, when annealing, soaking time is 6 hours, and temperature is 830-850 DEG C;
6) carry out Quench and temper, temperature is 1020-1070 DEG C, carries out the tempering of 520-550 DEG C, and tempering only needs to carry out once.
Below be schematically described the invention and embodiment thereof, this description does not have restricted, and actual proportioning and operation are not limited thereto.So, if those of ordinary skill in the art enlightens by it, when not departing from this creation aim, designing the frame mode similar to this technical scheme and embodiment without creationary, the protection domain of this patent all should be belonged to.
Claims (3)
1. a wear-resisting super-hard high-speed steel, is characterized in that, described mass ratio is as follows,
C1.2%-1.8%
Si0.5%-2.2%
Mn0.2%-0.6%
Al0.6%-3.2%
Cr4.6%-7.4%
Mo1.5%-2.6%
V2%-3.2%
W3.3-4.8%
Nb0.3-1.8%
P≤0.03%
S≤0.03%
All the other are Fe.
2. the wear-resisting super-hard high-speed steel of one according to claim 1, its preferred mass ratio is as follows:
C1.6%
Si1.5%
Mn0.5%
Al1.7%
Cr4.8%
Mo2.1%
V2.3%
W4.2%
Nb1.3%
P≤0.03%
S≤0.03%
All the other are Fe.
3. the wear-resisting super-hard high-speed steel of one according to claim 1, is characterized in that: described Mn/S > 20.
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58117863A (en) * | 1981-12-02 | 1983-07-13 | Hitachi Metals Ltd | High speed tool steel with high wear resistance and toughness |
| JPS6136070B2 (en) * | 1981-10-29 | 1986-08-16 | Hitachi Metals Ltd | |
| CN1168417A (en) * | 1997-02-04 | 1997-12-24 | 大连钢铁集团有限责任公司 | General purpose high-speed steel |
| EP0903420A2 (en) * | 1997-09-17 | 1999-03-24 | Latrobe Steel Company | Cobalt free high speed steels |
| CN1226609A (en) * | 1999-01-26 | 1999-08-25 | 尹道乐 | Economic high speed steel |
| CN102758148A (en) * | 2012-07-05 | 2012-10-31 | 无锡市钻通工程机械有限公司 | High-speed steel for roller |
| CN103789650A (en) * | 2012-11-03 | 2014-05-14 | 无锡市森信精密机械厂 | Preparation method of wear-resistant high-speed steel |
-
2014
- 2014-12-31 CN CN201410843817.5A patent/CN105296868A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6136070B2 (en) * | 1981-10-29 | 1986-08-16 | Hitachi Metals Ltd | |
| JPS58117863A (en) * | 1981-12-02 | 1983-07-13 | Hitachi Metals Ltd | High speed tool steel with high wear resistance and toughness |
| CN1168417A (en) * | 1997-02-04 | 1997-12-24 | 大连钢铁集团有限责任公司 | General purpose high-speed steel |
| EP0903420A2 (en) * | 1997-09-17 | 1999-03-24 | Latrobe Steel Company | Cobalt free high speed steels |
| CN1226609A (en) * | 1999-01-26 | 1999-08-25 | 尹道乐 | Economic high speed steel |
| CN102758148A (en) * | 2012-07-05 | 2012-10-31 | 无锡市钻通工程机械有限公司 | High-speed steel for roller |
| CN103789650A (en) * | 2012-11-03 | 2014-05-14 | 无锡市森信精密机械厂 | Preparation method of wear-resistant high-speed steel |
Non-Patent Citations (1)
| Title |
|---|
| 王振东等: "《感应炉冶炼》", 30 September 2007, 化学工业出版社 * |
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Application publication date: 20160203 |