CN1172171A - Quasi-bainitic steel - Google Patents
Quasi-bainitic steel Download PDFInfo
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- CN1172171A CN1172171A CN 95113726 CN95113726A CN1172171A CN 1172171 A CN1172171 A CN 1172171A CN 95113726 CN95113726 CN 95113726 CN 95113726 A CN95113726 A CN 95113726A CN 1172171 A CN1172171 A CN 1172171A
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Abstract
The present invention relates to a quasi-bainite steel. It is made up by using Mn and elements capable of preventing carbon compound from separating out as main additive alloy elements, using one or several kinds of Mo, Cr, B, W and Re, etc. as auxiliary additive alloy elements and with quasi-bainite as the texture, in which there is no carbon compound in presence so as to improve relative mechanical properties of the bainite steel. Said invented product is simple in manufacturing process, and possesses good mouldability and weldability, hardenability, high tensile strength, large impact toughness, long fatigue resistance and low cost. etc..
Description
The present invention relates to a kind of steel alloy.
Because it is simple that bainitic steel has thermal treatment, hardening capacity is relatively large, characteristics such as welding property is good, so so far from the fifties, various countries material supplier author has worked out all multiple bainitic steels, as: the Fortiweld 55.70 of Britain, the MB130 of Japan, 150,170, the Mn-B of China is a bainitic steel (Chinese patent CN 1042950A) etc., and existing bainitic steel has a common feature, promptly all is serve as main tissue composition with typical bainite, owing to unavoidably occur on the typical case in the process air cooler, the lower bainite tissue, particularly typical upper bainite tissue occurs, thereby has worsened the performance of bainitic steel, as: reduce tensile strength and plasticity and various fatigue property, especially obvious damage impelling strength has limited applying of bainitic steel.
The objective of the invention is to avoid above-mentioned weak point of the prior art, and provide a kind of manufacturing process simple, can guarantee thermal treatment quality, have good hot formability and weldability, the hardening capacity height can be avoided the appearance of typical upper and lower bainite structure in the process air cooler, the tensile strength height, impelling strength is big, and fatigue lifetime is long, the quasi-bainite steel that cost is low.
Purpose of the present invention can reach by following measure:
A kind of quasi-bainite steel, its special character are that its composition is made up of main addition element and at least a additional alloying element, and described main addition element is C, Mn and hinders carbide and separate out element that its weight percent consists of:
C 0.04～1.3
Mn 1.0～3.5
Hinder that carbide is separated out element 0.8～2.8 described additional alloying element and weight percent consists of: all the other are Fe Mo 0～0.6 Cr 0～2.0 B 0～0.005 W 0～1.2 Re 0～0.3 Al 0～2.8 Si 0～2.8.
The present invention hinders carbide and separates out element and can be Si or Al.It is preferable with Si or Al effect that the obstruction carbide is separated out element, also can get Ni or Cu etc.
Composition of the present invention and weight percent thereof consist of:
C 0.04～0.2
Mn 1.2～3.0
Si 0～1.5 Al 0～2.0
Mo 0～0.6 B 0～0.005
All the other are Fe.The steel of this composition is preferable as sheet material, section bar, oil pipeline, welding assembly etc., as: the various section bars of the tipping bucket plate of heavy-duty car, automotive frame, weight handling equipment.
Composition of the present invention and weight percent thereof consist of:
C 0.09～0.3
Mn 2.5～3.2
Si 0～2.0 Al 0～2.0
Mo 0～0.6 B 0～0.005
All the other are Fe.It is preferable that the steel of this composition can be used as oil exploration equipment, high intensity standard part, axial workpiece, oil pipeline, pressurized vessel, construction(al)steel etc., as: drill collar, drilling rod, bolt, nut, electric locomotive motor transmission shaft, generator rotor shaft, steam turbine rotor shaft, automobile axle shaft, automobile castellated shaft, gear shaft, IV grade reinforcing steel etc.
Composition of the present invention and weight percent composition thereof also can be:
C 0.12～0.4
Mn 1.0～3.0
Si 0～2.0 Al 0～2.0
Cr 1.0～2.0
Mo 0～0.6 B 0～0.005
All the other are Fe.The steel of this composition is used as the carburized parts steel, as: all kinds of carburized gears, heavy carburizing drill steel etc. are preferable.
Composition of the present invention and weight percent composition thereof also can be:
C 0.26～0.6
Mn 2.0～3.2
Si 0～2.8 Al 0～2.0％
Cr 0～2.0
Mo 0～0.6
B 0～0.005
Re 0～0.3
All the other are Fe.The steel of this composition is preferable as abrasion-proof structure, wear-resistant cast steel parts etc., as: coal winning machine cutting bit, ball mills and liner plate, heavy drill shank, turbine blade, excavator bucket teeth, dozer perching knife etc.
Composition of the present invention and weight percent composition thereof also can be:
C 0.26～0.6
Mn 2.0～3.2
Si 0～1.9 Al 0～2.0％
Mo 0～0.4
B 0～0.005
All the other are Fe.The steel of this composition is preferable as spring steel, building and railroad sleeper usefulness V level Twisted Steel etc.
Composition of the present invention and weight percent composition thereof also can be:
C 0.7～1.3
Mn 2.0～3.2
Si 1.2～1.6 or Al 1.0～1.5
Cr 0～1.1
Mo 0～0.4
B 0～0.004
All the other are Fe.The steel of this composition can be used as the tool and mould steel, as: cold-work die, cutter etc.
The effect of each alloying element among the present invention:
C: be used to guarantee intensity rank, processing performance of steel etc.
Mn: can make that the C curve of proeutectoid ferrite and perlitic transformation moves to right among the TTT figure, but the C curve position influence that low-carbon (LC) shellfish body is changed is little, can guarantee like this to obtain the Bei Shi tissue in very big cooling rate scope, improves the bainite hardening capacity of steel.Mn can also force down bainite and begin transition temperature, increases the degree of supersaturation of carbon in the bainite ferrite, helps the raising of meta-bainite intensity.
Si, Al: be in order to hinder separating out of carbide, to obtain the meta-bainite tissue of forming by bainite ferrite and residual austenite.
Mo, W: on the TTT curve, can make perlite and bainite distinguish from, proeutectoid ferrite and pearliticly begin to separate out line effectively moves to right, bainite begun that to separate out line influence little, help greatly obtaining bainite structure under the air cooling condition, improve bainite hardening capacity, but, should use no or little because Mo, W price are more expensive as far as possible.
Cr: make the perlite of TTT curve and bainite distinguish from, in, under the condition of low-carbon (LC), can move to right significantly proeutectoid ferrite and perlite begin to separate out line, under certain condition instead of part Mo or W amount, simultaneously also can force down bainite and begin to separate out line, improve the intensity of accurate shellfish body steel.
B: can stop the plain body of pro-eutectoid to be separated out effectively, be very beneficial for obtaining bainite.For the steel that adds B, the production of some steel mill is stable inadequately, does not wish to use, but uses B to reduce cost.
Re: the effect that purifies steel is arranged.
Alloying element unite adding, its effect is more obvious than adding fashionable effect separately, effect is better, reasonably chooses cooperation, can obtain optimum performance.
Be 32 embodiment of the present invention below, its composition and weight percent composition are respectively:
C Si Mn Mo Cr B W Al Re is remaining to be that Fe embodiment more than 1 0.082 1.13 1.37 0.36 is Fe for Fe embodiment more than 9 0.21 1.06 3.25 0.26 for Fe embodiment more than 10 0.22 1.77 3.42 0.24 for Fe embodiment more than 8 0.13 1.45 2.92 0.23 for Fe embodiment more than 7 0.13 1.99 3.05 0.27 for Fe embodiment more than 6 0.15 0.96 2.16 0.37 for Fe embodiment more than 5 0.13 1.51 3.21 0.19 for Fe embodiment more than 4 0.14 1.12 2.96 0.24 for Fe embodiment more than 3 0.11 1.31 3.06 0.27 for Fe embodiment more than 2 0.11 1.25 3.15 0.25 0.29 0.002
C Si Mn Mo Cr B W Al Re Fe11 0.20 1.83 2.61 0.24 Fe12 0.20 1.17 2.62 0.24 1.02 0.002 Fe13 0.21 2.40 3.16 0.26 1.04 Fe14 0.23 1.72 2.77 0.23 Fe15 0.23 1.69 3.09 0.27 Fe16 0.27 1.74 2.67 0.35 Fe17 0.29 1.65 2.64 0.25 0.01 Fe18 0.32 2.21 2.64 0.23 Fe19 0.33 2.28 2.57 0.22 0.15 Fe20 0.35 1.65 2.45 0.22 Fe21 0.40 2.06 2.62 0.25 Fe22 0.40 2.61 3.11 0.31 Fe23 0.43 1.92 2.67 0.31 Fe24 0.30 1.31 1.90 1.09 Fe25 0.29 1.31 2.03 0.18 1.07 Fe26 0.20 1.22 2.02 0.38 1.08 Fe27 0.31 1.36 1.97 1.07 0.003 Fe28 0.46 1.98 2.97 0.50 Fe29 0.52 1.96 3.21 0.39 Fe30 0.47 1.12 3.10 0.30 Fe31 0.87 1.14 2.89 0.35 Fe32 0.23 1.00 2.60 0.93 1.2 Fe
Casting technique of the present invention is:
Teeming temperature: 1500～1650 ℃, cast back air cooling, by performance requriements can directly use or first high tempering after, after normalizing and low-temperaturetempering, use again.
Forging of the present invention, roll, fill up moulding process and be:
Beginning forges, rolls temperature is 1200 ℃, finish-forging, rolls temperature and is 〉=850 ℃, and hot-forming temperature is 850～1000 ℃, air cooling then, and tempering or not tempering can be used as requested.
The present invention compared with prior art has following advantage:
1, the present invention is to be that tissue is formed with the meta-bainite, meta-bainite is by oversaturated bainite ferrite of carbon content and residual austenite two phase composites, carbides-free exists mutually in the tissue, avoided the pernicious effect of carbide, thereby improved the relative mechanical property of bainitic steel typical bainitic steel mechanical property.
2, the present invention can avoid the appearance of typical upper and lower bainite structure in the process air cooler, so improved tensile strength, plasticity and various fatigue property, tensile strength can be adjusted between 500MPa～2000MPa, and the flexural strength of tool steel (δ bb) can be adjusted between 2000MPa～3000MPa.
3, because tissue of the present invention is a meta-bainite, realized the good combination of obdurability, especially impelling strength improves greatly.Than the Fortiwell55.70 of Britain of same intensity rank, the MB130,150,170 of Japan, the Mn-B of China is bainitic steel (Chinese patent CN85100080A, CN86103008A), impelling strength has improved 1～2 times.
4, the present invention is to serve as the main alloy essence that adds with Mn, Si or Al, Mo, W, Cr, B, Re etc. are additional alloying element, by rational alloyage process, make quasi-bainite steel in quite wide speed of cooling scope, can obtain the meta-bainite tissue, behind the part air cooling as Φ 10～1000mm diameter, all can obtain the meta-bainite tissue.So meta-bainite steel hardenability of the present invention is very high, overcome the lower shortcoming of bainitic steel hardening capacity in the past.
5, the present invention in use, part all is to obtain the meta-bainite tissue under the air cooling condition, the part of especially hot rolling, forge hot, hot extrusion or other thermoforming, can utilize the waste heat Direct Air-Cooled after the thermoforming to obtain the meta-bainite tissue, low-temperaturetempering or not tempering subsequently can be satisfied performance requriements, so can simplify technical process, reduce production costs, improve the quality of products.
6, the present invention because structural stress is little, little, the no quenching crack of distortion, thereby has guaranteed thermal treatment quality in the part manufacturing processed, has improved product percent of pass.Cold-formed property and weldability that it is good make the range of application of quasi-bainite steel further enlarge.
7, quasi-bainite steel of the present invention, because main addition element is common alloy, China's reserves are abundant, cheap, so the cost of this steel grade is suitable with general low alloy steel.
8, the present invention does not have particular requirement to smelting, pour into a mould, roll to cut, so general steel mill need can not go into operation by increase equipment, has generalization easily.
Be some reduced parameters and the performance analysis of the present invention and prior art below:
1, adopt the heavy-duty car tipping bucket steel plate of the Japanese Keten60 steel work of import, its dispatch from the factory steel measured performance and performance comparison of the present invention:
a
KV(J/cm
2) ℃-60 ℃ of thermal treatment process KeTen60 600 18 30 are modified in steel grade σ b (MPa) σ 5 (%)-15
Roll 605 28 65 44+600 ℃ of tempering of back air cooling steel of the present invention
As seen the present invention can replace fully by Japanese import steel Keten60, and technology obtains simplifying.
2, stone oil drill collar steel commonly used is 42CrMo, and its thermal treatment process is " normalizing increases temperature tempering, and the reheat water quenching and oil-cooling adds high tempering twice ".
The technical requirements of the stone oil drill collar of Ministry of Petroleum Industry and performance data of the present invention contrast:
σ 0.2 (MPa) σ b (MPa) δ 4 (%) hardness A
KV(J) drill collar external diameter 79～175＞758＞965＞13 HB285～341＞54
(mm) 176～280?＞689 ＞930 ＞13 HB285～341 ＞54
Steel 1,042 1,256 15.5 HRC42 113 of the present invention
As seen utilize quasi-bainite steel of the present invention can make stone oil drill collar fully, and combination of strength and toughness to be higher than 42CrMo and, on the other hand, meta-bainite steel heat treatment process of the present invention is that normalizing adds low-temperaturetempering, can simplify the thermal treatment process that drill collar is produced greatly, reduce quenching strain and break, reduce production costs.
3, quasi-bainite steel of the present invention is compared with typical bainitic steel (is bainitic steel as Fortiwell70, the CH8510080A of Britain, the M-B among the CN86103008A), realized the better cooperation of obdurability, especially impelling strength improves greatly, has overcome the low shortcoming of typical bainitic steel toughness plasticity.
Chemical Composition (Wt%) contrast: grade of steel C Si Mn B Mo C remarks
1 0.12 0.81 2.6 0.003 CN8510080A
82 0.45 0.8 2.2 0.002 N86102008AFortiwell70,0.1 1.5 0.003 0.5 1.5 Britain steel 0.27 1.74 2.67 0.35 steel 0.13 1.45 2.92 0.23 of the present invention of the present invention
Mechanical property contrast: grade of steel σ b (MPa) σ 0.2 (MPa) δ (%) ψ (%) aku (J/cm
2) 1 940 600 16 50 60 82 1,300 1,200 7 30 40Fortiwell70,1,164 920 20.2 62.4 70 steel 1,711 1,404 11 37 88 steel 907 653 28 67 126 of the present invention of the present invention
4, heavy drilling tool is generally 23CrNi3MoA with steel, 830 ℃ of quench oil or water after the carburizing, use after the low-temperaturetempering and quasi-bainite steel of the present invention replacement 23CrNi3MoA, its performance can meet or exceed the 23CrNi3MoA steel fully, these cost an arm and a leg but because quasi-bainite steel of the present invention has replaced Cr, Ni with these common alloying elements of Mn, Si, the element that the china natural resources reserves are few, so the quasi-bainite steel cost reduces greatly, practicality, generalization are stronger.Performance comparison: steel grade σ b (MPa) σ 0.2 (MPa) δ 5 (%) aKu (J/cm
2) 23CrNi3MoA 930 735 11 78 steel 1,256 1,042 15.5 80 steel 1,340 959 14.8 89 of the present invention of the present invention
5, quasi-bainite steel of the present invention can be used as and wear-resistingly uses with steel, as: replace 35CrMn2Si, 42CrMo.Produce pick, replace high mangaenese steel, rich chromium cast iron to produce abrading-ball, liner plate etc., use quasi-bainite steel can improve performance, simplify technology, reduce cost.
Quasi-bainite steel of the present invention is compared with 35CrMn2Si, comprehensive mechanical property improves, wear resistance improves, and cutting-gear life can improve 1～2 times, performance comparison: grade of steel σ b (MPa) σ 0.2 (MPa) δ 5 (%) aKu (J/cm
2) relative wear resistance 35CrMnSi 1,650 9 50 1 steel 1,711 1,404 11 89 0.75～0.91 notes of the present invention: relative wear resistance equals sample weightlessness/standard weightlessness.
Compare with high mangaenese steel, quasi-bainite steel of the present invention is when load is not very big, and its wear resistance is better than high mangaenese steel, can replace high mangaenese steel to make the bucket tooth of excavator, the perching knife of dozer etc., and foundry goods can use.So technology is simple, excellent property, with low cost, this is to use the characteristics of quasi-bainite steel of the present invention.
Wear weight loss (mg) grade of steel thermal treatment process σ b (MPa) hardness pin disc type dynamic load formula
1050～1100 ℃ of Mn13 water malleableize 560 HB179～229 39 228 steel normalizings of the present invention add 300 ℃ of 1711 HRC49 81
Tempering steel as cast condition 2149 HRC54 32 113 of the present invention annotate: pin disc type abrasive conditions is: positive pressure 2300g, 180 order waterproof abrasive papers.
Dynamic load formula abrasive conditions is: ballistic work 2J, abrasive material: 80 order quartz sands.
6, the V level Twisted Steel that uses of building and railroad sleeper, China often selects 45Si2Cr etc. for use at present, through rolling wear water quenching after, reusable lead is bathed the heating tempering, energy consumption, plumbous source consumes bigger, complex process, the production cost height, environmental pollution simultaneously is more serious.And add low-temperaturetempering after using meta-bainite steel rolling of the present invention, and performance can satisfy the requirement of GB GB4463～88, and technology is simple, production cost is low.Moreover supply falls short of demand in present China V level Twisted Steel market, has very big potentiality so promote meta-bainite V level Twisted Steel.Synopsis is as follows:
Loose rate
σ b (MPa) σ 0.2 (MPa) δ 10 (%) 0.8 δ 0.2 * 10hGB4463-88 1,470 1,330 6 1.545Si2Cr 1,590 1,420 7.0 1.19 steel 1,849 1,581 7.5 0.73 of the present invention
7, in various fatigue experiments, quasi-bainite steel of the present invention is compared with the steel part with other type of intensity, and its fatigue property has all demonstrated superiority.
The contrast of rotoflector fatigue property:
Grade of steel σ b (MPa) σ-1 (MPa)
30CrMnSi 1100 310
40CrNiMo 1200 490
Steel 1,150 550 of the present invention
Tensile fatigue performance comparison (tensile stress 1000～1200MPa)
Grade of steel σ b (MPa) fatigue lifetime (cycle)
30CrMnSi 1100 210500
Steel 1,135 358467 of the present invention
The impact fatigue performance comparison:
Grade of steel b (MPa) fatigue lifetime (cycle)
18Cr2Ni4W 1440 12000
Steel 1,280 165000 of the present invention
8, quasi-bainite steel of the present invention is under the close condition of intensity, and its fracture toughness property is higher than the steel grade of other type, for example: grade of steel σ b (MPa) K
1c(MPam
1/2) 18Cr2Ni4W 1,440 97 steel 1,280 140 of the present invention
Claims (8)
1, a kind of quasi-bainite steel is characterized in that, its composition is made up of main addition element and at least a additional alloying element, and described main addition element is C, Mn and hinders carbide and separate out element that its weight percent consists of:
C 0.04～1.3
Mn 1.0～3.5
The obstruction carbide separates out element 0.8～2.8 described additional alloying element and weight percent consists of:
Mo 0～0.6 Cr 0～2.0
B 0～0.005 W 0～1.2
Re 0～0.3 Al 0～2.8
All the other are Fe for Si 0～2.8.
2, quasi-bainite steel as claimed in claim 1 is characterized in that: it is Si or Al that described obstruction carbide is separated out element.
3, quasi-bainite steel as claimed in claim 1 or 2 is characterized in that, its composition and weight percent thereof consist of:
C 0.04～0.2
Mn 1.2～3.0
Si 0～1.5 Al 0～2.0
Mo 0～0.6 B 0～0.005
All the other are Fe.
4, quasi-bainite steel as claimed in claim 1 or 2 is characterized in that, its composition and weight percent thereof consist of:
C 0.09～0.3
Mn 2.5～3.2
Si 0～2.0 Al 0～2.0
Mo 0～0.6 B 0～0.005
All the other are Fe.
5, quasi-bainite steel as claimed in claim 1 or 2 is characterized in that, its composition and weight percent thereof consist of:
C 0.12～0.4
Mn 1.0～3.0
Si 0～2.0 Al 0～2.0
Cr 1.0～2.0
Mo 0～0.6 B 0～0.005
All the other are Fe.
6, quasi-bainite steel as claimed in claim 1 or 2 is characterized in that, its composition and weight percent thereof consist of:
C 0.26～0.6
Mn 2.0～3.2
Si 0～2.8 Al 0～2.0％
Cr 0～2.0
Mo 0～0.6
B 0～0.005
Re 0～0.3
All the other are Fe.
7, quasi-bainite steel as claimed in claim 1 or 2 is characterized in that, its composition and weight percent thereof consist of:
C 0.26～0.6
Mn 2.0～3.2
Si 0～1.9 Al 0～2.0％
Mo 0～0.4
B 0～0.005
All the other are Fe.
8, quasi-bainite steel as claimed in claim 1 or 2 is characterized in that, its composition and weight percent thereof consist of:
C 0.7～1.3
Mn 2.0～3.2
Si 0～2.8 Al 0～2.8
Cr 0～1.1
Mo 0～0.4
B 0～0.004
All the other are Fe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 95113726 CN1172171A (en) | 1995-08-24 | 1995-08-24 | Quasi-bainitic steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 95113726 CN1172171A (en) | 1995-08-24 | 1995-08-24 | Quasi-bainitic steel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1172171A true CN1172171A (en) | 1998-02-04 |
Family
ID=5080046
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 95113726 Pending CN1172171A (en) | 1995-08-24 | 1995-08-24 | Quasi-bainitic steel |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1172171A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100387746C (en) * | 2005-04-18 | 2008-05-14 | 河南省强力机械有限公司 | Quasi bainitic steel and its application in rail way industry |
| CN100408712C (en) * | 2005-04-18 | 2008-08-06 | 河南省强力机械有限公司 | Quasi bainitic steel |
| CN101423916B (en) * | 2008-12-15 | 2010-06-02 | 河海大学 | Low-alloy abrasion-proof and corrosion resistant steel and method for producing the same |
| CN101603157B (en) * | 2009-07-16 | 2011-03-30 | 谢新佑 | Chromium-tungsten-rare earth-boron series air cooling medium-high carbon bainite steel and preparation method thereof |
| CN111996436A (en) * | 2020-07-07 | 2020-11-27 | 邯郸慧桥复合材料科技有限公司 | Bucket tooth of large excavator and preparation method thereof |
| CN116265594A (en) * | 2021-12-17 | 2023-06-20 | 鄂尔多斯市神东天隆矿山机械有限责任公司 | High-strength steel for high-performance cutting pick and heat treatment process thereof |
-
1995
- 1995-08-24 CN CN 95113726 patent/CN1172171A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100387746C (en) * | 2005-04-18 | 2008-05-14 | 河南省强力机械有限公司 | Quasi bainitic steel and its application in rail way industry |
| CN100408712C (en) * | 2005-04-18 | 2008-08-06 | 河南省强力机械有限公司 | Quasi bainitic steel |
| CN101423916B (en) * | 2008-12-15 | 2010-06-02 | 河海大学 | Low-alloy abrasion-proof and corrosion resistant steel and method for producing the same |
| CN101603157B (en) * | 2009-07-16 | 2011-03-30 | 谢新佑 | Chromium-tungsten-rare earth-boron series air cooling medium-high carbon bainite steel and preparation method thereof |
| CN111996436A (en) * | 2020-07-07 | 2020-11-27 | 邯郸慧桥复合材料科技有限公司 | Bucket tooth of large excavator and preparation method thereof |
| CN111996436B (en) * | 2020-07-07 | 2021-08-31 | 邯郸慧桥复合材料科技有限公司 | Bucket tooth of large excavator and preparation method thereof |
| CN116265594A (en) * | 2021-12-17 | 2023-06-20 | 鄂尔多斯市神东天隆矿山机械有限责任公司 | High-strength steel for high-performance cutting pick and heat treatment process thereof |
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