CN101368247A - Novel chromium system hot die steel and thermal treatment process thereof - Google Patents
Novel chromium system hot die steel and thermal treatment process thereof Download PDFInfo
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Abstract
The invention relates to chromium hot work die steel which belongs to hot work die steel, in particular to hot work die steel containing lower tungsten and a thermal processing technique thereof. Counted by weight percentage, the die steel includes 0.3 to 0.8 percent of C, 0.2 to 0.8 percent of Si, 0.2 to 0.8 percent of Mn, 6.0 to 8.0 percent of Cr, 1.0 to 2.4 percent of W, 0.8 to 2.0 percent of Mo, 0.3 to 1.0 percent of V, 0.3 to 8.0 percent of Co, 0.3 to 1.5 percent of Ni, equal to or less than 0.005 percent of S, equal to or less than 0.030 percent of P and 0.03 to 0.10 percent of B; the content range of a nitride is as follows: the nitride is equal to or more than 0.02 percent, or equal to or less than 0.20 percent; the content range of N is as follows: the N is equal to or more than 0.02 percent, or equal to or less than 0.10 percent; and the rest is Fe. The grains of the steel are thinner; the effects of greatly increased heat resistance, toughness and anti-pressing intensity are generated; the rigidity is between 55 and 61HRC which is more than three times than the durable times of the existing die steel. The invention also provides a thermal processing technique with a lower quenching temperature between 1050 and 1090 DEG C for the steel.
Description
Technical field
The invention belongs to a kind of hot-work die steel, particularly relate to a kind of hot-work die steel and thermal treatment process thereof that replaces tungsten W with chromium Cr in a large number.
Background technology
China's hot-work die steel 3Cr2W8V steel commonly used extensively is used as black and non-ferrous metal hot extruding die.The thermostability height of this steel, use temperature reaches 650 ℃, but low, the cold and hot fatigability of the thermal conductivity of tungsten series hot die steel is poor.Institutes Of Technology Of Nanjing is studied the thermal fatigue property of 3Cr2W8V hot-work die steel, draws may preferred plan be: 830 ℃ * 2h+730 ℃ * the 4h Spheroidizing Annealing, 1150 ℃ * 30min quenches, 630 ℃ * 2h tempering 2 times.Do not reach 1150 ℃ quenching temperature with general cabinet-type electric furnace, on small batch is produced, be inconvenient to quench and the time of delivery like this.
Chinese invention patent ZL 200410010656.8 authorizes publication number CN1557985 " novel rotten hot-work die steel " to disclose a kind of novel rotten hot-work die steel material.Form by weight percentage by following main chemical compositions: C:0.200～0.350, Cr:7.000～13.000, Mo:0.800～2.000, Ni:0.600～1.500, V:0.300～1.200, Mn:0.200～0.600, Si:0.700～1.500, S≤0.040, P≤0.040, N:0.005～0.100, Ti:0.050～0.200, Ca:0.001～0.050, Ce:0.000～0.100, Y:0.000～0.100, Fe: surplus.This is invented novel rotten hot-work die steel and has high work-ing life.This steel has very high chromium Cr and the content of silicon Si, but the scope of Cr content 7.000～13.000 is too wide, can not be a kind of steel.
Chinese invention patent application 200610095014.1 application publication number CN1904122 " high performance hot-work die steel " high performance hot-work die steel of the present invention, comprise following content chemical ingredients by weight percentage: C:0.70～1.98, Si:0.30～1.50, Mn:0.20～0.70, Cr:0.80～2.00, W:0.80～1.40, Mo:1.00～1.80, Ni:1.00～3.00, V:0.30～1.20, Bi:0.01～0.02, rare earth silicon and magnesium: 0.05～0.08, P＜0.03, S＜0.03, surplus is Fe and inevitable trace impurity.This steel has the very high carbon C and the content of nickel.The scope of content C0.70～1.98 of carbon C is too wide, can not be a kind of steel.
Summary of the invention
The purpose of this invention is to provide a kind of thermotolerance and better hot-work die steel of toughness than existing hot-work die steel 3Cr2W8V.
Second time of the present invention, purpose provided the thermal treatment process of this hot-work die steel of the present invention.
Technical scheme of the present invention is:
A kind of novel chromium system hot die steel of the present invention comprises by weight percentage:
Carbon C 0.30～0.80%, silicon Si 0.20～0.80%, manganese Mn 0.20～0.80%, chromium Cr 6.00～8.00%,
Tungsten W 1.00～2.40%, molybdenum Mo 0.80～2.00%, vanadium V 0.30～1.00%, cobalt Co 0.30～8.00%,
Nickel 0.30～1.50%, sulphur S≤0.005%, phosphorus P≤0.030%, its surplus is iron Fe.Novel chromium system hot die steel of the present invention is made Cr7W1Mo1V NiCo by name by oneself.
As preferably, above-mentioned novel chromium system hot die steel comprises by weight percentage:
Carbon C 0.38～0.60%, silicon Si 0.20～0.40%, manganese Mn 0.20～0.40%, chromium Cr 6.00～7.00%,
Tungsten W 1.60～2.00%, molybdenum Mo 1.20～1.60%, vanadium V 0.40～0.60%, cobalt Co 0.30～8.00%,
Nickel 0.30～0.70%, sulphur S≤0.005%, phosphorus P≤0.030%, its surplus is iron Fe.
As value most preferably, above-mentioned novel chromium system hot die steel comprises by weight percentage:
Carbon C 0.65%, silicon Si 0.30%, manganese Mn 0.30%, chromium Cr 7.00%,
Tungsten W 1.80%, molybdenum Mo 1.40%, vanadium V 0.50%, cobalt Co 0.50%,
Nickel 0.50%, sulphur S≤0.005%, phosphorus P≤0.030%, its surplus is iron Fe.
As value most preferably, above-mentioned novel chromium system hot die steel comprises by weight percentage:
Carbon C 0.40%, silicon Si 0.30%, manganese Mn 0.30%, chromium Cr 7.00%,
Tungsten W 1.80%, molybdenum Mo 1.40%, vanadium V 0.50%, cobalt Co 0.50%,
Nickel 0.50%, sulphur S≤0.005%, phosphorus P≤0.030%, its surplus is iron Fe.
As preferably, comprise also in above-mentioned any novel chromium system hot die steel that the scope that also comprises boron content by weight percentage is 0.03%--0.10%.
As preferably, also comprise the nitride that also comprises trace by weight percentage in above-mentioned a kind of novel chromium system hot die steel, the scope of content is 0.02%≤nitride≤0.20%, and nitride comprises: BN, AlN, FeN, CrN, MnN, TiN, VN's is a kind of or whole; Also comprise the nitrogen N of trace, the scope of nitrogen N content is 0.02%≤nitrogen N≤0.10% by weight percentage.
As preferably, also comprise in above-mentioned a kind of novel chromium system hot die steel also comprising 0.30% niobium Nb by weight percentage, the titanium Ti below 0.30%, the rare earth element below 0.05%.
Above-mentioned any proportioning, the thermal treatment process of the novel chromium system hot die steel of any preferred proportioning may further comprise the steps:
(1), preheat: with whole raw material pre-heating temperatures is 580 ℃～620 ℃, and the time of preheating is 50～70 minutes;
(2), the heating of quenching: quenching temperature is 1050 ℃～1090 ℃, adopts the cooling of oil cooling or air cooling or salt bath, and the cool time is 20～30 minutes;
(3), tempering: tempering temperature is 520 ℃～540 ℃, and air cooling is to room temperature then.
As preferably, after preheating, also carry out preheating the second time, quench then, pre-heating temperature is 850 ℃～900 ℃ for the second time, and preheating the time for the second time is 40～50 minutes; After the air cooling of tempering for the first time, carry out the tempering second time again, tempering temperature is 520 ℃～540 ℃ for the second time, and air cooling is to room temperature then.
As preferably, the air cooling of tempering is for the second time carried out tempering for the third time again to room temperature, and tempering temperature is 480 ℃～500 ℃ for the third time, and air cooling is to room temperature then.
What the main composition range of a kind of novel chromium system hot die steel of the present invention was determined the reasons are as follows:
Carbon C: being the key factor of control martensite intensity, also is to influence the flexible principal element.Domestic and international studies show that in a large number about low carbon martensite: if will obtain comprehensive mechanical performance preferably, the carbon amount will be controlled at .80%-0.30% in the steel.
Silicon Si: the adding of silicon can improve the hardening capacity and the matrix strength of steel.Silicon is dissolved among α-Fe, and it is strengthened, and improves transition temperature and the high-temperature oxidation resistance that α-Fe changes r-Fe.Silicon is to be insoluble to carbide, but separates out the dispersity of alloy carbide can improve tempering the time; Recent research shows: add the toughness that an amount of silicon can improve steel.
Manganese Mn:, can also eliminate the harmful effect of sulphur except improving the hardening capacity.
Chromium Cr: chromium forms carbide, can improve the hardening capacity of steel.Chromium is dissolved in austenite when quenching heating, quenches the back solid solution in martensite, can improve the anti-tempering ability of steel.In the hot-work die steel, chromium content is less than at 2% o'clock among α-Fe, and along with the increase of chromium content, hot strength rises thereupon, but chromium content is greater than 2% o'clock, and hot strength will descend on the contrary with the increase of chromium content.Simultaneously, also carbide segregation can be caused, impelling strength will be caused reducing.
Tungsten W and molybdenum Mo: in the hot-work die steel that is added in polynary composite alloying of tungsten, can reduce the thermo-responsive tendency of mistake of steel significantly, and improve the thermostability of steel.But the content of tungsten surpasses 2.0-3.0%, and the heat resistance of steel is not had obvious raising again, and toughness is descended.Generally should be controlled at about 1%.The adding of molybdenum can improve the hardening capacity and the heat resistance of steel, can prevent temper brittleness again.But molybdenum adds too much, can cause the molybdenum carbide segregation, is needle-like or netted separating out along crystal boundary in drawing process, influences the toughness of steel.
Vanadium V: vanadium can reduce the thermo-responsive tendency of mistake of steel.The vanadium that adds 0.1-0.3% in low alloy steel just has obvious effects.In the martensitic steel, content of vanadium reaches 0.5% just can produce enough secondary hardening effects.The vanadium amount is too high, tempering in the secondary hardening temperature range, and the plasticity of steel, toughness will obviously descend.
Nickel: nickel is non-carbon compound forming element, can improve the hardening capacity of steel.To the strength and toughness of steel, good action is arranged all.But excessive nickel can impel along the austenite grain boundary carbide precipitate, and this can cause matrix interalloy constituent content to reduce, and the steel heat resistance is descended.
Cobalt Co, niobium Nb, titanium Ti: niobium can form the very high NbC of stability, has just begun to dissolve in the austenite at 1050 ℃, therefore suppresses grain growth, can improve heat resistance and high tenacity.The adding of cobalt can significantly improve scale resistance and red hardness (wear resisting property is good).Add 3% cobalt, can improve the wear resisting property of its steel greatly.The effect of titanium in steel is exactly when high temperature, avoids grain coarsening, therefore can strengthen the matrix of steel, can improve the toughness of steel again.
Sulphur S and phosphorus P:, belong to the element that as far as possible is controlled at few content range by the harmful element that starting material are brought into.
Advantage of the present invention: the relatively more existing hot-work die steel 3Cr2W8V of novel chromium system hot die steel Cr7W1Mo1V NiCo of the present invention has reduced the content of the tungsten W that costs an arm and a leg in a large number, roll up the content of chromium Cr, increased molybdenum Mo on a small quantity, nickel, the content of cobalt Co, its raw materials cost and existing hot-work die steel 3Cr2W8V are basic identical, but crystal grain is refinement more, produced thermotolerance, anti-toughness, the effect that ultimate compression strength all increases greatly, through facts have proved in a large number, the mould of doing with novel chromium system hot die steel Cr7W1Mo1V NiCo of the present invention is the durable number of times more than three times of existing hot-work die steel 3Cr2W8V equal dies.Because the content of existing hot-work die steel 3Cr2W8V tungsten W is too high, hot-short performance is not good in actual application, burst apart easily, the a large amount of content that reduce tungsten W of the present invention, roll up the content of chromium Cr, it is not good that the technical scheme that has increased the content of molybdenum Mo, nickel, cobalt Co has on a small quantity solved the hot-short performance of 3Cr2W8V, the problem of bursting apart easily, thereby the toughness increase is more durable.
The quenching temperature of the thermal treatment process of novel chromium system hot die steel of the present invention is 1050 ℃～1090 ℃, compare for 1120 ℃～1150 ℃ with existing 3Cr2W8V quenching temperature, though only descended 30 ℃～100 ℃, but these 30 ℃～100 ℃ decline is significant to box-type furnace: do not reach 1150 ℃ quenching temperature with general box-type furnace, hardness is at 55～61HRC.On producing, small batch is inconvenient to quench and the time of delivery like this.Not only produce inconvenience, also need great amount of investment, take production site.
Description of drawings
Fig. 1 is invention novel chromium system hot die steel heat treatment cycle curve figure;
Embodiment
A kind of novel chromium system hot die steel of the present invention comprises by weight percentage:
Carbon C 0.65%, silicon Si 0.30%, manganese Mn 0.30%, chromium Cr 7.00%,
Tungsten W 1.80%, molybdenum Mo 1.40%, vanadium V 0.50%, cobalt Co 0.50%,
Nickel 0.50%, sulphur S≤0.005%, phosphorus P≤0.030%, its surplus is iron Fe,
The step of above-mentioned novel chromium system hot die steel thermal treatment process is as follows:
(1), preheat: with whole raw material pre-heating temperatures is 580 ℃～620 ℃, and the time of preheating is 50～70 minutes;
(2), the heating of quenching: quenching temperature is 1050 ℃～1090 ℃, adopts the cooling of oil cooling or air cooling or salt bath, and the cool time is 20～30 minutes;
(3), tempering: tempering temperature is 520 ℃～540 ℃, and air cooling is to room temperature then.
A kind of novel chromium system hot die steel of the present invention comprises by weight percentage:
Carbon C 0.65%, silicon Si 0.30%, manganese Mn 0.30%, chromium Cr 6.50%,
Tungsten W 1.80%, molybdenum Mo 1.40%, vanadium V 0.50%, cobalt Co 0.50%,
Nickel 0.50%, sulphur S≤0.005%, phosphorus P≤0.030%, niobium Nb0.30%,
Titanium Ti0.30%, rare earth element 0.05%, boron 0.04%, its surplus is iron Fe.
The step of above-mentioned novel chromium system hot die steel thermal treatment process is as follows:
(1), preheat for the first time: with whole raw material pre-heating temperatures is 580 ℃～620 ℃, and the time of preheating is 50～70 minutes;
(2), preheat for the second time: after preheating for the first time, carry out preheating the second time, quench then, pre-heating temperature is 850 ℃～900 ℃ for the second time, and preheating the time for the second time is 40～50 minutes.
(3), the heating of quenching: quenching temperature is 1050 ℃～1090 ℃, adopts the cooling of oil cooling or air cooling or salt bath, and the cool time is 20～30 minutes;
(4), tempering for the first time: tempering temperature is 520 ℃～540 ℃, and air cooling is to room temperature then.
(5), tempering for the second time: carry out the tempering second time again after the air cooling of tempering for the first time, tempering temperature is 520 ℃～540 ℃ for the second time, and air cooling is to room temperature then.
Embodiment 3
A kind of novel chromium system hot die steel of the present invention comprises by weight percentage:
Carbon C 0.65%, silicon Si 0.30%, manganese Mn 0.30%, chromium Cr 6.50%,
Tungsten W 1.80%, molybdenum Mo 1.40%, vanadium V 0.50%, cobalt Co 0.50%,
Nickel 0.50%, sulphur S≤0.005%, phosphorus P≤0.030%, niobium Nb0.30%,
Titanium Ti0.30%, rare earth element 0.05%, boron 0.08%, boron nitride BN 0.02% its surplus is iron Fe.
The step of above-mentioned novel chromium system hot die steel thermal treatment process is as follows:
(1), preheat for the first time: with whole raw material pre-heating temperatures is 580 ℃～620 ℃, and the time of preheating is 50～70 minutes;
(2), preheat for the second time: after preheating for the first time, carry out preheating the second time, quench then, pre-heating temperature is 850 ℃～900 ℃ for the second time, and preheating the time for the second time is 40～50 minutes.
(3), the heating of quenching: quenching temperature is 1050 ℃～1090 ℃, adopts the cooling of oil cooling or air cooling or salt bath, and the cool time is 20～30 minutes;
(4), tempering for the first time: tempering temperature is 520 ℃～540 ℃, and air cooling is to room temperature then.
(5), tempering for the second time: carry out the tempering second time again after the air cooling of tempering for the first time, tempering temperature is 520 ℃～540 ℃ for the second time, and air cooling is to room temperature then.
(6) tempering for the third time: to room temperature, carry out tempering for the third time in the tempering air cooling second time again, tempering temperature is 480 ℃～500 ℃ for the third time, and air cooling is to room temperature then.
Embodiment 4,
A kind of hot arc novel chromium system hot die steel of the present invention comprises by weight percentage:
Carbon C 0.40%, silicon Si 0.30%, manganese Mn 0.30%, chromium Cr 7.00%,
Tungsten W 1.80%, molybdenum Mo 1.40%, vanadium V 0.50%, cobalt Co 0.50%,
Nickel 0.50%, sulphur S≤0.005%, phosphorus P≤0.030%, its surplus is iron Fe.
The step of above-mentioned hot arc novel chromium system hot die steel thermal treatment process is same as embodiment 3.Present embodiment hot arc novel chromium system hot die steel hardness is at 55～57HRC.
Embodiment 5,
A kind of temperature section novel chromium system hot die steel of the present invention comprises by weight percentage:
Carbon C 0.65%, silicon Si 0.30%, manganese Mn 0.30%, chromium Cr 7.00%,
Tungsten W 1.80%, molybdenum Mo 1.40%, vanadium V 0.50%, cobalt Co 0.50%,
Nickel 0.50%, sulphur S≤0.005%, phosphorus P≤0.030%, niobium Nb0.30%,
Titanium Ti0.30%, rare earth element 0.05%, boron 0.10%, nitride BN, AlN, FeN, CrN gross weight are 0.08%, its surplus is iron Fe.
The step of above-mentioned temperature section novel chromium system hot die steel thermal treatment process is same as embodiment 3.Present embodiment temperature section novel chromium system hot die steel hardness is at 58～61HRC.
Embodiment 6,
Another temperature section novel chromium system hot die steel of the present invention comprises by weight percentage:
Carbon C 0.65%, silicon Si 0.30%, manganese Mn 0.30%, chromium Cr 7.00%,
Tungsten W 1.80%, molybdenum Mo 1.40%, vanadium V 0.50%, cobalt Co 0.50%,
Nickel 0.50%, sulphur S≤0.005%, phosphorus P≤0.030%, niobium Nb0.30%
Titanium Ti0.30%, rare earth element 0.05%, boron 0.08%, it is 0.10% that whole content of nitride BN, AlN, FeN, CrN, MnN supply; Also comprise 0.02% nitrogen N, its surplus is iron Fe.
The step of above-mentioned temperature section novel chromium system hot die steel thermal treatment process is same as embodiment 3.Present embodiment temperature section novel chromium system hot die steel hardness is at 58～61HRC.
Embodiment 7,
Another temperature section novel chromium system hot die steel of the present invention comprises by weight percentage:
Carbon C 0.65%, silicon Si 0.30%, manganese Mn 0.30%, chromium Cr 7.00%,
Tungsten W 1.80%, molybdenum Mo 1.40%, vanadium V 0.50%, cobalt Co 0.50%,
Nickel 0.50%, sulphur S≤0.005%, phosphorus P≤0.030%, niobium Nb0.30%,
Titanium Ti0.30%, rare earth element 0.05%, boron 0.06%, it is 0.20% that whole content of nitride BN, AlN, FeN, CrN, MnN, TiN, VN supply; Also comprise 0.10% nitrogen N, its surplus is iron Fe.
The step of above-mentioned temperature section novel chromium system hot die steel thermal treatment process is same as embodiment 3.Present embodiment temperature section novel chromium system hot die steel hardness is at 58～61HRC.
Embodiment 8,
Another temperature section novel chromium system hot die steel of the present invention comprises by weight percentage:
Carbon C 0.65%, silicon Si 0.30%, manganese Mn 0.30%, chromium Cr 7.00%,
Tungsten W 1.80%, molybdenum Mo 1.40%, vanadium V 0.50%, cobalt Co 0.50%,
Nickel 0.50%, sulphur S≤0.005%, phosphorus P≤0.030%, niobium Nb0.30%,
Titanium Ti0.30%, rare earth element 0.05%, whole content of nitride BN, AlN, FeN, CrN, MnN, TiN, VN also comprise 0.08% nitrogen N for being 0.20%, its surplus is iron Fe.
The step of above-mentioned temperature section novel chromium system hot die steel thermal treatment process is same as embodiment 3.Present embodiment temperature section novel chromium system hot die steel hardness is at 58～61HRC.
Embodiment 9,
Another temperature section novel chromium system hot die steel of the present invention comprises by weight percentage:
Carbon C 0.65%, silicon Si 0.30%, manganese Mn 0.30%, chromium Cr 7.00%,
Tungsten W 1.80%, molybdenum Mo 1.40%, vanadium V 0.50%, cobalt Co 0.50%,
Nickel 0.50%, sulphur S≤0.005%, phosphorus P≤0.030%, niobium Nb0.30%,
Titanium Ti0.30%, whole content of nitride BN, FeN, CrN, MnN also comprise 0.06% nitrogen N for being 0.06%, its surplus is iron Fe.
The step of above-mentioned temperature section novel chromium system hot die steel thermal treatment process is same as embodiment 3.Present embodiment temperature section novel chromium system hot die steel hardness is at 58～61HRC.
Claims (10)
1. novel chromium system hot die steel is characterized in that comprising by weight percentage:
Carbon C 0.30～0.80%, silicon Si 0.20～0.80%, manganese Mn 0.20～0.80%, chromium Cr 6.00～8.00%,
Tungsten W 1.00～2.40%, molybdenum Mo 0.80～2.00%, vanadium V 0.30～1.00%, cobalt Co 0.30～8.00%,
Nickel 0.30～1.50%, sulphur S≤0.005%, phosphorus P≤0.030%, its surplus is iron Fe.
2. novel chromium system hot die steel according to claim 1 is characterized in that comprising by weight percentage:
Carbon C 0.38～0.60%, silicon Si 0.20～0.40%, manganese Mn 0.20～0.40%, chromium Cr 6.00～7.00%,
Tungsten W 1.60～2.00%, molybdenum Mo 1.20～1.60%, vanadium V 0.40～0.60%, cobalt Co 0.30～8.00%,
Nickel 0.30～0.70%, sulphur S≤0.005%, phosphorus P≤0.030%, its surplus is iron Fe.
3. novel chromium system hot die steel according to claim 1 is characterized in that comprising by weight percentage:
Carbon C 0.65%, silicon Si 0.30%, manganese Mn 0.30%, chromium Cr 7.00%,
Tungsten W 1.80%, molybdenum Mo 1.40%, vanadium V 0.50%, cobalt Co 0.50%,
Nickel 0.50%, sulphur S≤0.005%, phosphorus P≤0.030%, its surplus is iron Fe.
4. novel chromium system hot die steel according to claim 1 is characterized in that comprising by weight percentage:
Carbon C 0.40%, silicon Si 0.30%, manganese Mn 0.30%, chromium Cr 7.00%,
Tungsten W 1.80%, molybdenum Mo 1.40%, vanadium V 0.50%, cobalt Co 0.50%,
Nickel 0.50%, sulphur S≤0.005%, phosphorus P≤0.030%, its surplus is iron Fe.
5. novel chromium system hot die steel according to claim 1 is characterized in that also comprising by weight percentage that the scope of boron content is 0.03%--0.10%.
6. novel chromium system hot die steel according to claim 1, it is characterized in that also comprising by weight percentage the nitride of trace, the scope of content is 0.02%≤nitride≤0.20%, and nitride comprises: BN, AlN, FeN, CrN, MnN, TiN, VN's is a kind of or whole; Also comprise the nitrogen N of trace, the scope of nitrogen N content is 0.02%≤nitrogen N≤0.10% by weight percentage.
7. novel chromium system hot die steel according to claim 1 is characterized in that also comprising by weight percentage 0.30% niobium Nb, the titanium Ti below 0.30%, the rare earth element below 0.05%.
8. by the thermal treatment process of any one described novel chromium system hot die steel of claim 1 to 7, it is characterized in that may further comprise the steps:
(1), preheat: with whole raw material pre-heating temperatures is 580 ℃～620 ℃, and the time of preheating is 50～70 minutes;
(2), the heating of quenching: quenching temperature is 1050 ℃～1090 ℃, adopts the cooling of oil cooling or air cooling or salt bath, and the cool time is 20～30 minutes;
(3), tempering: tempering temperature is 520 ℃～540 ℃, and air cooling is to room temperature then.
9. the thermal treatment process of a kind of novel chromium system hot die steel according to claim 8, after it is characterized in that preheating, carry out preheating the second time, quench then, pre-heating temperature is 850 ℃～900 ℃ for the second time, and preheating the time for the second time is 40～50 minutes; Carry out the tempering second time after the described tempering air cooling again, tempering temperature is 520 ℃～540 ℃ for the second time, and air cooling is to room temperature then.
10. the thermal treatment process of novel chromium system hot die steel according to claim 9 is characterized in that in the tempering air cooling second time carrying out tempering for the third time again to room temperature, and tempering temperature is 480 ℃～500 ℃ for the third time, and air cooling is to room temperature then.
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