CN103834864A - Novel 9Cr2BAlN alloy tool steel - Google Patents

Novel 9Cr2BAlN alloy tool steel Download PDF

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CN103834864A
CN103834864A CN201210479902.9A CN201210479902A CN103834864A CN 103834864 A CN103834864 A CN 103834864A CN 201210479902 A CN201210479902 A CN 201210479902A CN 103834864 A CN103834864 A CN 103834864A
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tool steel
9cr2baln
steel
alloy tool
nitride
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CN103834864B (en
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周章龙
周静茹
黄高仁
周向儒
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周章龙
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Abstract

The invention provides a novel 9Cr2BAlN alloy tool steel. The steel contains C, Cr, Mg, B, Al, N, and nitride. The improvement is that the tool steel comprises, by mass, 0.80-0.95 part of C, 1.3 1.7 parts of Cr, 0.01-0.05 part of Mg, 0.01-0.09 part of B, 0.10-0.80 part of Al, 0.01-0.10 part of N, 0.01-0.08 part of the total nitrides (BN, AlN, TiN) and the balance of Fe and unavoidable impurities. Compared with the prior art, the novel 9Cr2BAlN alloy tool steel provided by the invention not only maintains the mechanical properties of cold working die steel Cr12 and Cr12Mo1V1, and greatly reduces the quenching temperature and saves a lot of energy.

Description

A kind of novel 9Cr2BAlN alloy tool steel
[technical field]
The present invention relates to a kind of alloy tool steel, specifically relate to the steel alloy of a kind of Mg of adding, B, Al, N and nitride.
[background technology]
The alloy tool steel that adds alloying element and form on the basis of carbon tool steel, is called for short and closes work steel.The measuring instrument steel of the conventional Chinese trade mark has 9Cr2,9SiCr, 8MnSi and Cr2 etc.With carbon tool steel ratio, alloy tool steel hardenability is good, thermal treatment tearing tendency is good, wear resistance and thermotolerance high, can adapt to different purposes needs.Be widely used in the various tool that carbon tool steel performance can not meet the demands.Such as screw die, screw tap, drill bit, reamer, gearcutter, cutting tool, cold roll, steel seal, punching cutter etc.It is low that this steel has quenching temperature, be out of shape the features such as little, but to add alloy content little due to steel, with cold-work die steel Cr12, Cr12Mo1V1 ratio, its wear resistance, intensity difference are apart from all larger, and chromium, tungsten, vanadium are noble metal, in smelting process, consumed energy is more, and adds chromium, molybdenum, vanadium that the quenching temperature of steel is improved, and is not suitable for environmental protection, be not energy saving and environment friendly product, these metals are again rare type strategic resource.
The inventor finds through the large quantity research of test of long duration, adds Mg, B, Al, N and the nitride (BN of low melting point; AlN; TiN) steel alloy can effectively improve wear resistance and the intensity of steel, can make the intensity of 9Cr2 improve and even exceed cold-work die steel Cr12, Cr12Mo1V1, makes it range of application more extensive, and more economical, environmental protection, economizes on resources.
[summary of the invention]
The object of the invention is, the steel alloy of a kind of Mg, the B, Al, N and nitride BN, AlN and/or the TiN that add low melting point in alloy tool steel 9Cr2 is provided.This kind of tool steel provided by the invention increases substantially wear resistance and the intensity of alloy tool steel, is the excellent instead of steel of cold-work die steel Cr12, Cr12Mo1V1.
In technical scheme of the present invention, add the steel alloy of low melting point Mg, B, Al, N and nitride BN, AlN and/or TiN, but not containing the oxide impurity of these compounds, not only make S≤0.008% and P≤0.03%, and oxide aggregate O≤0.005%.
Magnesium: this element adding is in the oxidation-resistance while of improving steel, low melting point metal Mg makes it forge in heat-processed in annealing, the binary alloy that the elements such as the Mg element of separating out and harmful low melting point Sn, the Pb of matrix coherence, As, Sb, Bi form becomes the intermetallic compound of higher melt, also changes size and the form of low melting point element simultaneously.
Aluminium: add this element energy refinement steel as-cast structure, reduce the brilliant spacing arm of little skill.More effectively stop Austenite Grain Growth by changing the size of carbide and distributing like this, can promote residual austenite to martensitic transformation, raising tempered-hardness, reduce tempering temperature.In the situation that loss in toughness is little, improve bending strength and the wear resistance of steel.There is good antioxidant property simultaneously.
Boron: wherein add boron to be conducive to suppress the r-a phase transformation of steel, significantly suppress pearlitic formation, improve the content of bainite, in the substructure of refinement bainite, improved intensity and kept good low-temperature flexibility.In steel, add appropriate boron, can increase steel creep rupture life at high temperature, and improve over-all properties and the hardening capacity of steel.Nitride is mainly added in austenitic steel to improve its intensity and solidity to corrosion, and in Hi-Stren steel, nitrogen is also used as micro alloying element, and by forming microalloying carbon, nitride plays strengthening effect.Nitride in steel has higher stability than carbide, the tiny M(C.N of disperse in precipitated phase) raising of type nitride strengthening successful.The Carbonitride Precipitation that forms disperse after tempering promotes secondary hardening mutually, even has the function of three underhardenings during to some amount.
Nitrogen: nitrogen element is present in matrix with the form of interstitial solute atom, there is crystal grain thinning, produce solution strengthening and shorten Secondary Dendrite Arm Spacing, reduce grain segregation, improve inclusion and distribute, improve steel physical strength, improve the function of impelling strength and wear resistance.And solid solution state nitrogen can reduce the solid matter imperfect dislocation in austenite, restriction is containing the dislocation motion of interstitial impurity atomic group, and strengthening effect is stronger than carbon.Solid solution nitrogen is similar to the effect of carbon, nickel, can expand r mutually and make stabilization of austenite.Solid solution nitrogen can improve the hardening capacity of material, and under same quenching technology, quench-hardened case is darker, makes core tissue obtain improvement to a certain degree simultaneously.There is short range order in nitrogen-atoms, do not need long distance diffusion in residual austenite, is easy to first separate out (FeCr) 2N; Can reduce tempering temperature.
It is few that 9Cr2 alloy tool steel exist alloying element, the shortcoming of wear resistance intensity difference, and be significantly less than cold-work die steel Cr12, Cr12Mo1V1 work-ing life.After 1~3 ton of intermediate frequency is smelted, after the steel alloy of Mg, B, Al, N and nitride BN, AlN and/or TiN that adds low melting point through secondary smelting, through forging, annealing, quenching and temper, improve more than 5 times work-ing life than traditional 9Cr2 alloy, and hardness exceedes Cr12, Cr12Mo1V1.
The object of this invention is to provide a kind of improved 9Cr2BAlN alloy tool steel, except being otherwise noted, amount described in the application is mass parts meter.
The novel 9Cr2BAlN alloy tool steel that the present invention carries is containing C, Si, Mn, Cr, Mg, B, Al, N and nitride, and its improvements are, by mass parts, and C:0.75~1.00; Si:0.30~0.39; M n :≤0.40Cr:1.30~1.80; Mg:0~0.005; B:0~0.008; Al:0~0.80; N:0.03~0.10; Nitride 0.01~0.08; Surplus is Fe and inevitable impurity.
C:0.80~0.95 in preferred 9Cr2BAlN alloy tool steel provided by the invention; Si:0.39; Mn:0.30Cr:1.40; Mg:0.003; Al:0.70; N:0.03; Nitride 0.01~0.08, surplus is Fe and inevitable impurity.
In a preferred 9Cr2BAlN alloy tool steel more provided by the invention, C:0.80; Si:0.35; M n:0.35Cr:1.45; Mg:0.001; Al:0.50; N:0.15; Nitride 0.08, surplus is Fe and inevitable impurity.
The provided by the invention the 3rd preferred 9Cr2BAlN alloy tool steel is containing C:0.75; Si:0.36; M n:0.20Cr:1.60; Mg:0.005; B:0.005; Al:0.30; N:0.04; Nitride 0.03, surplus is Fe and inevitable impurity.
The provided by the invention the 4th preferred 9Cr2BAlN alloy tool steel is containing C:1.00; Si:0.30; Mn:0.10Cr:1.30; Mg:0.004; B:0.005; N:0.07; Nitride 0.01, surplus is Fe and inevitable impurity.
The provided by the invention the 5th preferred 9Cr2BAlN alloy tool steel is containing Mg:0.001; B:0.005, Al:0.50 and N:0.1, surplus is Fe and inevitable impurity.
The provided by the invention the 6th preferred 9Cr2BAlN alloy tool steel contains C:0.80~0.95, Mn:0.25~0.30, N:0.03 and nitride: 0.06, and surplus is Fe and inevitable impurity.
The provided by the invention the 7th preferred 9Cr2BAlN alloy tool steel is containing C:0.75; Si:0.36; Mn:0.30Cr:1.70; B:0.008; Al:0.80; N:0.10; Nitride 0.08, surplus is Fe and inevitable impurity.
The provided by the invention the 8th preferred 9Cr2BAlN alloy tool steel is containing C:0.90; Si:0.30; Mn:0.10Cr:1.70; Mg:0.001; B:0.007; Al:0.75; N:0.03; Nitride 0.08, surplus is Fe and inevitable impurity.
With prior art ratio, improved 9Cr2BAlN alloy tool steel provided by the invention, had both kept the mechanical property of cold-work die steel, greatly reduced again quenching temperature, had saved mass energy.
Accompanying drawing explanation
Fig. 1 is thermal treatment process figure provided by the invention.
[embodiment]
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in further detail.
Embodiment 1
In 9Cr2BAlN alloy tool steel provided by the invention, comprise by weight percentage:
C_0.90,Si_0.30,Mn_0.30,Cr_1.50,Al_0.50,B_0.005,
Mg_0.003, N_0.03, nitride _ 0.02, surplus is Fe and inevitable impurity.
The step of above-mentioned novel 9Cr2BAlN alloy tool steel heat treatment process is as follows:
(1), preheat: be 560 ℃~600 ℃ by whole raw material pre-heating temperatures, the time of preheating is 60 minutes;
(2), the heating of quenching: quenching temperature is 820 ℃~860 ℃, adopts oil cooling or air cooling or salt bath cooling, and the cool time is 20~30 minutes;
(3), tempering: tempering temperature is 180 ℃~220 ℃, and then air cooling is to room temperature.
Embodiment 2
In 9Cr2BAlN alloy tool steel provided by the invention, comprise by weight percentage:
C_0.90,Si_0.30,Mn_0.30,Cr_1.50,Al_0.50,B_0.001,
Mg_0.005, N_0.08, nitride _ 0.06, surplus is Fe and inevitable impurity.
The step of above-mentioned novel 9Cr2BAlN alloy tool steel heat treatment process is as follows:
(1), preheat for the first time: be 560 ℃~600 ℃ by whole raw material pre-heating temperatures, the time of preheating is 60 minutes;
(2), preheat for the second time: after preheating for the first time, preheat for the second time, then quench, 750 ℃~800 ℃ of pre-heating temperatures for the second time, the time that preheats is for the second time 40~50 minutes.
(3), the heating of quenching: quenching temperature is 820 ℃~860 ℃, adopts oil cooling or air cooling or salt bath cooling, and the cool time is 20~30 minutes;
(4), tempering for the first time: tempering temperature is 180 ℃~220 ℃, and then air cooling is to room temperature.
(5), tempering for the second time: after tempering air cooling for the first time, carry out again tempering for the second time, 180 ℃~220 ℃ of tempering temperatures for the second time, then air cooling is to room temperature.
Embodiment 3
In 9Cr2BAlN alloy tool steel provided by the invention, comprise by weight percentage:
C_0.85,Si_0.30,Mn_0.30,Cr_1.60,Al_0.30,
B_0.008, N_0.10, nitride _ 0.08, surplus is Fe and inevitable impurity.
The step of above-mentioned novel 9Cr2BAlN alloy tool steel heat treatment process is as follows:
(1), preheat for the first time: be 560 ℃~600 ℃ by whole raw material pre-heating temperatures, the time of preheating is 60 minutes;
(2), preheat for the second time: after preheating for the first time, preheat for the second time, then quench, 750 ℃~800 ℃ of pre-heating temperatures for the second time, the time that preheats is for the second time 40~50 minutes.
(3), the heating of quenching: quenching temperature is 820 ℃~860 ℃, adopts oil cooling or air cooling or salt bath cooling, and the cool time is 20~30 minutes;
(4), tempering for the first time: tempering temperature is 180 ℃~220 ℃, and then air cooling is to room temperature.
(5), tempering for the second time: after tempering air cooling for the first time, carry out again tempering for the second time, 180 ℃~220 ℃ of tempering temperatures for the second time, then air cooling is to room temperature.
(6) tempering for the third time: to room temperature, then carry out tempering for the third time in tempering air cooling for the second time, 180 ℃~220 ℃ of tempering temperatures for the third time, then air cooling is to room temperature.
The step of embodiment 4~8 thermal treatment process and embodiment 3 are same.
Surplus in the 9Cr2BAlN alloy tool steel of embodiments of the invention 1~8 is that each composition and the performance Fe and inevitable impurity is listed in the table below 1.
Table 1
Finally should be noted that: above embodiment is only in order to illustrate that technical scheme of the present invention is not intended to limit, although the present invention is had been described in detail with reference to above-described embodiment, those of ordinary skill in the field are to be understood that: still can modify or be equal to replacement the specific embodiment of the present invention, and do not depart from any modification of spirit and scope of the invention or be equal to replacement, it all should be encompassed in the middle of claim scope of the present invention.

Claims (9)

1. a novel 9Cr2BAlN alloy tool steel, described tool steel contains C, Si, Mn, Cr, Mg, B, Al, N and nitride, it is characterized in that, by mass parts, C:0.75~1.00; Si:0.30~0.39; M n :≤0.40; Cr:1.30~1.80; Mg:0~0.005; B:0~0.008; Al:0~0.80; N:0.03~0.10; Nitride: 0.01~0.08; Surplus is Fe and inevitable impurity.
2. according to the 9Cr2BAlN alloy tool steel of claim 1, it is characterized in that: C:0.80~0.95; Si:0.39; M n:0.30; Cr:1.40; Mg:0.003; Al:0.70; N:0.03; Nitride: 0.01~0.08.
3. according to the 9Cr2BAlN alloy tool steel of claim 1, it is characterized in that: C:0.80; Si:0.35; M n:0.35; Cr:1.45; Mg:0.001; Al:0.50; N:0.15; Nitride: 0.08.
4. according to the novel 9Cr2BAlN alloy tool steel of the kind of claim 1, described tool steel contains, and it is characterized in that C:0.75; Si:0.36; M n:0.20; Cr:1.60; Mg:0.005; B:0.005; Al:0.30; N:0.04; Nitride: 0.03.
5. according to the novel 9Cr2BAlN alloy tool steel of the one of claim 1, it is characterized in that C:1.00; Si:0.30; M n:0.10; Cr:1.30; Mg:0.004; B:0.005; N:0.07; Nitride: 0.01.
6. according to the novel 9Cr2BAlN alloy tool steel of the one of claim 1, it is characterized in that Mg:0.001; B:0.005; Al:0.50 and N:0.1.
7. according to the 9Cr2BAlN alloy tool steel of claim 1, it is characterized in that described C:0.80~0.95, M n:0.25~0.30, N:0.03 and nitride: 0.06.
8. according to the 9Cr2BAlN alloy tool steel of claim 1, it is characterized in that C:0.75; Si:0.36; M n:0.30; Cr:1.70; B:0.008; Al:0.80; N:0.10; Nitride: 0.08.
9. according to the 9Cr2BAlN alloy tool steel of claim 1, it is characterized in that C:0.90; Si:0.30; M n:0.10; Cr:1.70; Mg:0.001; B:0.007; Al:0.75; N:0.03; Nitride: 0.08.
CN201210479902.9A 2012-11-22 2012-11-22 A kind of 9Cr2BAlN alloy tool steel Expired - Fee Related CN103834864B (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105177435A (en) * 2015-08-13 2015-12-23 武汉钢铁(集团)公司 Thin hot rolled steel strip for cutting tools and manufacturing method of thin hot rolled steel strip
CN110396710A (en) * 2019-08-08 2019-11-01 温州中牙模具有限公司 A kind of wear-resisting screw plate and its production technology
CN112481472A (en) * 2020-11-27 2021-03-12 上海天竺机械刀片有限公司 Heat treatment process of alloy tool steel blade

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61553A (en) * 1984-06-13 1986-01-06 Hitachi Metals Ltd High-speed tool steel having superior wear and depositing resistance
JPS62180035A (en) * 1986-01-31 1987-08-07 Hiroyuki Kanai Metallic traveller for spinning machine
CN1511969A (en) * 2002-11-06 2004-07-14 大同特殊钢株式会社 Alloy tool steel and its producing method and mold using it
JP2009013439A (en) * 2007-06-29 2009-01-22 Daido Steel Co Ltd High toughness high-speed tool steel
CN101660097A (en) * 2009-08-13 2010-03-03 丁家伟 Wear-resisting alloy steel with high boron, high chrome and low carbon and preparation method thereof

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61553A (en) * 1984-06-13 1986-01-06 Hitachi Metals Ltd High-speed tool steel having superior wear and depositing resistance
JPS62180035A (en) * 1986-01-31 1987-08-07 Hiroyuki Kanai Metallic traveller for spinning machine
CN1511969A (en) * 2002-11-06 2004-07-14 大同特殊钢株式会社 Alloy tool steel and its producing method and mold using it
JP2009013439A (en) * 2007-06-29 2009-01-22 Daido Steel Co Ltd High toughness high-speed tool steel
CN101660097A (en) * 2009-08-13 2010-03-03 丁家伟 Wear-resisting alloy steel with high boron, high chrome and low carbon and preparation method thereof

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105177435A (en) * 2015-08-13 2015-12-23 武汉钢铁(集团)公司 Thin hot rolled steel strip for cutting tools and manufacturing method of thin hot rolled steel strip
CN105177435B (en) * 2015-08-13 2017-04-12 武汉钢铁(集团)公司 Thin hot rolled steel strip for cutting tools and manufacturing method of thin hot rolled steel strip
CN110396710A (en) * 2019-08-08 2019-11-01 温州中牙模具有限公司 A kind of wear-resisting screw plate and its production technology
CN112481472A (en) * 2020-11-27 2021-03-12 上海天竺机械刀片有限公司 Heat treatment process of alloy tool steel blade

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