CN104818426B - A kind of high-strength micro-alloy rare earth cast steel and preparation method thereof - Google Patents
A kind of high-strength micro-alloy rare earth cast steel and preparation method thereof Download PDFInfo
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Abstract
The present invention relates to a kind of high-strength micro-alloy rare earth cast steel, the main chemical compositions of described cast steel includes C, Si, Mn, Nb, Ti, Re, La, Ce, P, S, ferrum and micro impurity element, the weight/mass percentage composition of described C, Si, Mn, Nb, Ti, Re, P, S is respectively C 0.30%～0.40%, Si 0.60%～0.80%, Mn 1.10%～1.40%, Nb 0.03%～0.09%, Ti 0.01～0.08%, Re 0.01%～0.20%, La0.01%～0.10%, Ce0.01%～0.15%, P≤0.035%, S≤0.010%.It is an advantage of the current invention that: the microalloying rare earth cast steel of the present invention can significantly improve yield strength and tensile strength under conditions of significantly reducing plasticity and toughness.
Description
Technical field
The present invention relates to a kind of cast steel material, big in the equipment such as a kind of applicable mine, cement, coal, oil
Type pressure part high-strength micro-alloy rare earth cast steel, and smelting, heat-treatment technology method.
Background technology
Large-scale steel-casting has the features such as shaping is relatively easy, production cost is relatively low, thus is widely used in mine, water
The fields such as mud, oil, boats and ships, but large-scale steel-casting easily occurs that in forming process shrinkage porosite, shrinkage cavity, pore and crackle etc. lack
Fall into, thus affect mechanical property and the service life of large-scale steel-casting, enterprise and national economy are caused bigger loss, this
Outward, owing to steel-making of intermediate frequency furnace cost is relatively low, China the most still has many enterprises to use steel-making of intermediate frequency furnace, and steelmaking process typically uses
Non-oxidizing process, it is impossible to molten steel is carried out dephosphorization and desulfurization, so it is poor to smelt steel quality out, this causes large-scale steel-casting to exist
It is more prone to during cast form that tissue defects occurs, such as casting crack and pore, so that its mechanical property and use the longevity
Life reduces further.
Additionally, silicon, manganese have a very rich in natural resources in China, and manganese steel, silico-manganese steel have higher intensity, hardness and
Wearability, therefore manganese steel, silico-manganese steel are a kind of materials conventional in large-scale steel-casting.Smelt manganese steel, silico-manganese steel often with ferrosilicon,
Ferromanganese is as alloying element, and in ferrosilicon, ferromanganese, phosphorus element content is more, and can not be to liquid steel dephosphorization during employing steel-making of intermediate frequency furnace
Desulfurization, so that the content of P elements is higher in manganese steel, silico-manganese steel, even beyond national standard, finally makes manganese steel, silico-manganese steel
Performance is not in full use.
Chinese patent literature CN 100999800 A(application number 200610155704.1) disclose one containing rare earth element
Cast steel and production method, its chemical composition and weight/mass percentage composition be: C 0.24%～0.32%, Si 1.0%～1.6%, Mn
1.0%～1.6%, Cr 0.2%～0.5%, Re 0.01%～0.20%, Ni≤0.05%, Mo≤0.01%, P≤0.035%, S≤
0.010%, B≤0.05%, surplus is ferrum and inevitable impurity.In this cast steel, the content of Si element is higher, is easily caused casting
The plasticity of steel part, toughness and cutting ability reduce.To add the total content of S higher for P simultaneously, thus reduces moulding of steel-casting further
Property and toughness.
Therefore, be just badly in need of developing a kind of high-strength micro-alloy rare earth cast steel that can reduce P and S constituent content and
Preparation method, through retrieval, does not finds technical scheme same or analogous with the present invention.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of high-strength micro-alloy that can reduce P and S constituent content
Rare earth cast steel and preparation method thereof.
For solving above-mentioned technical problem, the technical scheme is that a kind of high-strength micro-alloy rare earth cast steel, its wound
New point is: the main chemical compositions of described cast steel includes C, Si, Mn, Nb, Ti, Re, La, Ce, P, S, ferrum and trace
Impurity element, the weight/mass percentage composition of described C, Si, Mn, Nb, Ti, Re, P, S is respectively C 0.30%～0.40%, Si
0.60%～0.80%, Mn 1.10%～1.40%, Nb 0.03%～0.09%, Ti 0.01～0.08%, Re 0.01%～0.20%,
La0.01%～0.10%, Ce0.01%～0.15%, P≤0.035%, S≤0.010%.
Further, the total content of described Nb, Ti, La, Ce is less than or equal to 0.5%.
The smelting process of a kind of high-strength micro-alloy rare earth cast steel, uses intermediate frequency furnace to smelt, and its feature exists
Comprise the following steps in smelting process:
1) pretreatment: before Ye Lianing, steel scrap, alloying element and ladle are toasted, reduce the content of wherein aqueous vapor, and
Remove dirt and the rust on steel scrap surface.
2) dispensing: the recovery rate of alloying element C, Si, Mn is according to the recovery rate of C, Si, Mn in ZG35SiMn low-alloy cast steel
Calculating, the content of microalloy element Nb, Ti, La, Ce requires to carry out proportioning according to the chemical composition of steel.
3) feeding and feed: during charging, large, medium and small metal charge adds according to about 2:3:1, bulk metal furnace charge is put into
Furnace bottom, the space between bulk metal furnace charge and furnace bottom put into by biscuit metal furnace charge, it is ensured that tight upper pine under furnace charge in body of heater；Add
Furnace charge uses biscuit metal material.
4) alloy is added: after steel scrap is melting down in stove, first pre-add part ferromanganese, Antaciron, the change of stokehold to be detected molten steel
After studying point, further according to testing result add final required ferromanganese, Antaciron, and use and first add ferromanganese, then add ferrosilicon
Order adds；The alloying elements such as Nb, Ti, La, Ce are previously added ladle bottom after drying；In molten steel, carbon dust increasing is poured into during tapping
Carbon.
5) tapping: adjust according to step 4) and tap after the chemical composition in molten steel, tapping temperature control at 1650 DEG C～
1680 DEG C, on ladle liquid level, after tapping, it is sprinkled into appropriate slag former immediately.
6) final deoxidizing: carry out final deoxidizing with fine aluminium during tapping, in advance fine aluminium block is added ladle bottom, molten steel impact ladle
Making fine aluminium melt during bottom and react with the oxygen in molten steel to carry out deoxidation, the addition of fine aluminium is steel quality
0.050%～0.125%, and ensure that in high-strength micro-alloy rare earth cast steel, the aluminum content of residual is 0.03%～0.08%.
7) cast: by the pouring molten steel in step 6) ladle in preprepared mold, pouring temperature controls
1550 DEG C～1580 DEG C, cool down, remove casting mold after obtained be high-strength micro-alloy rare earth cast steel part.
Further, ferromanganese, Antaciron and rare earth Nb, Ti, La, Ce etc. need baking to be dried 2～5h before addition, dry
Roasting baking temperature is 100～300 DEG C.
Further, pre-add ferromanganese, the temperature range of Antaciron control at 1640 DEG C～1660 DEG C, stokehold to be detected steel
After Hydrochemical Composition, add final required ferromanganese, Antaciron；The order that twice adds alloy is and first adds ferromanganese conjunction
Gold, after treating that manganeisen is the most melting down, skimming, adds Antaciron.
Further, the microalloy element such as described Nb, Ti, La, Ce adds ladle bottom with the form of metal dust.
A kind of heat treatment method of high-strength micro-alloy rare earth cast steel, it is characterised in that: include normalized treatment and tempering
Process two parts；
Described normalized treatment technique is: in chamber type electric resistance furnace with the speed of 80 DEG C/h～120 DEG C/h be warming up to 860 DEG C～
960 DEG C, temperature retention time is steel-casting thickness (mm) × 1.5～1.8min/h, and then steel-casting is cooled to room temperature in atmosphere；
Described tempering heat treatment process is: be warming up to 600 DEG C with the speed of 80 DEG C/h～120 DEG C/h in chamber type electric resistance furnace
～650 DEG C, temperature retention time is steel-casting thickness (mm) × 1.8～2.2min/h, and then steel-casting is cooled to room in atmosphere
Temperature.Normalizing is less than 6h with the time interval of tempering.
Further, after heat treatment, its tensile strength is more than or equal to 720MPa to described steel-casting, and yield strength is more than
In 430MPa, percentage elongation is more than or equal to 10%, and the contraction percentage of area is more than or equal to 12%, and impact test temperature is that impact when 5 DEG C is inhaled
Receive merit more than or equal to 11.5J.
It is an advantage of the current invention that: the microalloying rare earth cast steel of (1) present invention can significantly reduce plasticity and tough
Under conditions of property, significantly improve yield strength and tensile strength.Described microalloying rare earth cast steel compared with common 35SiMn steel,
Its yield strength can improve more than 60MPa, and tensile strength can improve more than 95MPa.
(2) the microalloying rare earth cast steel of the present invention uses conventional smelting process, Technology for Heating Processing, in addition in steel with
The relatively inexpensive alloying element such as silicon, manganese is raw material, and the microalloy element content such as Nb, Ti, La, Ce is less, bigger
While degree ground improves cast properties, it is ensured that the manufacturing cost of foundry goods is relatively low, beneficially industrial applications.
(3) present invention is by improving conventional smelting process, can be effectively reduced containing of P element in molten steel
Amount, beneficially industrial applications and popularization.
(4) the microalloying rare earth cast steel of the present invention is through 860 DEG C～+600 DEG C～the 650 DEG C tempering of 960 DEG C of normalized treatment
After process, what mechanical property can be stable reaches: tensile strength is more than or equal to 720MPa, and yield strength is more than or equal to 430MPa,
Percentage elongation is more than or equal to 10%, and the contraction percentage of area is more than or equal to 12%, and impact test temperature is that impact absorbing energy when 5 DEG C is more than
In 11.5J, can be used for manufacturing the large-scale pressure-containing member in the fields such as cement, mine, coal, oil, in engineering machinery
The key components and parts such as large-scale tugboat, wheel belt and gear.
Accompanying drawing explanation
Fig. 1 is that normalizing temperature is on microalloying rare earth cast steel yield strength, the impact of tensile strength.
Fig. 2 is that normalizing temperature is on microalloying rare earth cast steel elongation percentage, the impact of impact flexibility.
Detailed description of the invention
Embodiment one
A kind of high-strength micro-alloy rare earth cast steel as shown in Figure 1, the main chemical compositions of cast steel includes C, Si, Mn
, Nb, Ti, Re, La, Ce, P, S, ferrum and micro impurity element, the percent mass of C, Si, Mn, Nb, Ti, Re, P, S
Content is respectively C 0.30%～0.40%, Si 0.60%～0.80%, Mn 1.10%～1.40%, Nb 0.03%～0.09%, Ti
0.01～0.08%, Re 0.01%～0.20%, La0.01%～0.10%, Ce0.01%～0.15%, P≤0.035%, S≤
0.010%。
The total content of Nb, Ti, La, Ce of the present invention is less than or equal to 0.5%.
The smelting process of a kind of high-strength micro-alloy rare earth cast steel, uses intermediate frequency furnace to smelt, smelting process
Comprise the following steps:
1) pretreatment: before Ye Lianing, steel scrap, alloying element and ladle are toasted, reduce the content of wherein aqueous vapor, and
Remove dirt and the rust on steel scrap surface.
2) dispensing: the recovery rate of alloying element C, Si, Mn is according to the recovery rate of C, Si, Mn in ZG35SiMn low-alloy cast steel
Calculating, the content of microalloy element Nb, Ti, La, Ce requires to carry out proportioning according to the chemical composition of steel.
3) feeding and feed: during charging, large, medium and small metal charge adds according to about 2:3:1, bulk metal furnace charge is put into
Furnace bottom, the space between bulk metal furnace charge and furnace bottom put into by biscuit metal furnace charge, it is ensured that tight upper pine under furnace charge in body of heater；Add
Furnace charge uses biscuit metal material.
4) alloy is added: after steel scrap is melting down in stove, first pre-add part ferromanganese, Antaciron, the change of stokehold to be detected molten steel
After studying point, further according to testing result add final required ferromanganese, Antaciron, and use and first add ferromanganese, then add ferrosilicon
Order adds；The alloying elements such as Nb, Ti, La, Ce are previously added ladle bottom after drying；In molten steel, carbon dust increasing is poured into during tapping
Carbon.
5) tapping: adjust according to step 4) and tap after the chemical composition in molten steel, tapping temperature control at 1650 DEG C～
1680 DEG C, on ladle liquid level, after tapping, it is sprinkled into appropriate slag former immediately.
6) final deoxidizing: carry out final deoxidizing with fine aluminium during tapping, in advance fine aluminium block is added ladle bottom, molten steel impact ladle
Making fine aluminium melt during bottom and react with the oxygen in molten steel to carry out deoxidation, the addition of fine aluminium is steel quality
0.050%～0.125%, and ensure that in high-strength micro-alloy rare earth cast steel, the aluminum content of residual is 0.03%～0.08%.
7) cast: by the pouring molten steel in step 6) ladle in preprepared mold, pouring temperature controls
1550 DEG C～1580 DEG C, cool down, remove casting mold after obtained be high-strength micro-alloy rare earth cast steel part.
The ferromanganese of the present invention, Antaciron and rare earth Nb, Ti, La, Ce etc. need baking to be dried 2～5h before addition, dry
Roasting baking temperature is 100～300 DEG C.
The pre-add ferromanganese of the present invention, the temperature range of Antaciron control at 1640 DEG C～1660 DEG C, stokehold to be detected steel
After Hydrochemical Composition, add final required ferromanganese, Antaciron；The order that twice adds alloy is and first adds ferromanganese conjunction
Gold, after treating that manganeisen is the most melting down, skimming, adds Antaciron.
The microalloy elements such as Nb, Ti, La, Ce of the present invention add ladle bottom with the form of metal dust.
Embodiment two
A kind of high-strength micro-alloy rare earth cast steel as shown in Figure 1, the main chemical compositions of cast steel includes C, Si, Mn
, Nb, Ti, Re, La, Ce, P, S, ferrum and micro impurity element, the percent mass of C, Si, Mn, Nb, Ti, Re, P, S
Content is respectively C 0.30%～0.40%, Si 0.60%～0.80%, Mn 1.10%～1.40%, Nb 0.03%～0.09%, Ti
0.01～0.08%, Re 0.01%～0.20%, La0.01%～0.10%, Ce0.01%～0.15%, P≤0.035%, S≤
0.010%。
The total content of Nb, Ti, La, Ce of the present invention is less than or equal to 0.5%.
The smelting process of a kind of high-strength micro-alloy rare earth cast steel, uses intermediate frequency furnace to smelt, smelting process
Comprise the following steps:
1) pretreatment: before Ye Lianing, steel scrap, alloying element and ladle are toasted, reduce the content of wherein aqueous vapor, and
Remove dirt and the rust on steel scrap surface.
2) dispensing: the recovery rate of alloying element C, Si, Mn is according to the recovery rate of C, Si, Mn in ZG35SiMn low-alloy cast steel
Calculating, the content of microalloy element Nb, Ti, La, Ce requires to carry out proportioning according to the chemical composition of steel.
3) feeding and feed: during charging, large, medium and small metal charge adds according to about 2:3:1, bulk metal furnace charge is put into
Furnace bottom, the space between bulk metal furnace charge and furnace bottom put into by biscuit metal furnace charge, it is ensured that tight upper pine under furnace charge in body of heater；Add
Furnace charge uses biscuit metal material.
4) alloy is added: after steel scrap is melting down in stove, first pre-add part ferromanganese, Antaciron, the change of stokehold to be detected molten steel
After studying point, further according to testing result add final required ferromanganese, Antaciron, and use and first add ferromanganese, then add ferrosilicon
Order adds；The alloying elements such as Nb, Ti, La, Ce are previously added ladle bottom after drying；In molten steel, carbon dust increasing is poured into during tapping
Carbon.
5) tapping: adjust according to step 4) and tap after the chemical composition in molten steel, tapping temperature control at 1650 DEG C～
1680 DEG C, on ladle liquid level, after tapping, it is sprinkled into appropriate slag former immediately.
6) final deoxidizing: carry out final deoxidizing with fine aluminium during tapping, in advance fine aluminium block is added ladle bottom, molten steel impact ladle
Making fine aluminium melt during bottom and react with the oxygen in molten steel to carry out deoxidation, the addition of fine aluminium is steel quality
0.050%～0.125%, and ensure that in high-strength micro-alloy rare earth cast steel, the aluminum content of residual is 0.03%～0.08%.
7) cast: by the pouring molten steel in step 6) ladle in preprepared mold, pouring temperature controls
1550 DEG C～1580 DEG C, cool down, remove casting mold after obtained be high-strength micro-alloy rare earth cast steel part.
The ferromanganese of the present invention, Antaciron and rare earth Nb, Ti, La, Ce etc. need baking to be dried 2～5h before addition, dry
Roasting baking temperature is 100～300 DEG C.
The pre-add ferromanganese of the present invention, the temperature range of Antaciron control at 1640 DEG C～1660 DEG C, stokehold to be detected steel
After Hydrochemical Composition, add final required ferromanganese, Antaciron；The order that twice adds alloy is and first adds ferromanganese conjunction
Gold, after treating that manganeisen is the most melting down, skimming, adds Antaciron.
The microalloy elements such as Nb, Ti, La, Ce of the present invention add ladle bottom with the form of metal dust.
The heat treatment method of a kind of high-strength micro-alloy rare earth cast steel, including normalized treatment and temper two parts；
The normalized treatment technique of the present invention is: be warming up to 860 with the speed of 80 DEG C/h～120 DEG C/h in chamber type electric resistance furnace
DEG C～960 DEG C, temperature retention time is steel-casting thickness (mm) × 1.5～1.8min/h, is then cooled in atmosphere by steel-casting
Room temperature；
The tempering heat treatment process of the present invention is: be warming up to the speed of 80 DEG C/h～120 DEG C/h in chamber type electric resistance furnace
600 DEG C～650 DEG C, temperature retention time is steel-casting thickness (mm) × 1.8～2.2min/h, is then cooled down in atmosphere by steel-casting
To room temperature.Normalizing is less than 6h with the time interval of tempering.
After heat treatment, its tensile strength is more than or equal to 720MPa to the steel-casting of the present invention, and yield strength is more than or equal to
430MPa, percentage elongation is more than or equal to 10%, and the contraction percentage of area is more than or equal to 12%, and impact test temperature is impact absorbing when 5 DEG C
Merit is more than or equal to 11.5J.
The microalloying rare earth cast steel of the present invention can significantly improve in the wrong under conditions of significantly reducing plasticity and toughness
Take intensity and tensile strength.Described microalloying rare earth cast steel is compared with common 35SiMn steel, and its yield strength can improve
More than 60MPa, tensile strength can improve more than 95MPa.
The microalloying rare earth cast steel of the present invention uses the smelting process of routine, Technology for Heating Processing, in addition with silicon, manganese in steel
It is raw material etc. relatively inexpensive alloying element, and the microalloy element content such as Nb, Ti, La, Ce is less, largely
While improving cast properties, it is ensured that the manufacturing cost of foundry goods is relatively low, beneficially industrial applications.
The present invention, by improving conventional smelting process, can be effectively reduced the content of P element in molten steel, have
It is beneficial to industrial applications and popularization.
The microalloying rare earth cast steel of the present invention is through 860 DEG C～+600 DEG C～650 DEG C temper of 960 DEG C of normalized treatment
After, what mechanical property can be stable reaches: tensile strength is more than or equal to 720MPa, and yield strength is more than or equal to 430MPa, elongation
Rate is more than or equal to 10%, and the contraction percentage of area is more than or equal to 12%, and impact test temperature is that impact absorbing energy when 5 DEG C is more than or equal to
11.5J, can be used for manufacturing the large-scale pressure-containing member in the fields such as cement, mine, coal, oil, in engineering machinery
The key components and partss such as large-scale tugboat, wheel belt and gear.
The chemical composition of table 1 embodiment and comparative example and heat treatment process parameter
Table 2 embodiment and the mechanical property parameters of comparative example
The ultimate principle of the present invention and principal character and advantages of the present invention have more than been shown and described.The technology of the industry
Personnel, it should be appreciated that the present invention is not restricted to the described embodiments, simply illustrating this described in above-described embodiment and description
The principle of invention, without departing from the spirit and scope of the present invention, the present invention also has various changes and modifications, and these become
Change and improvement both falls within scope of the claimed invention.Claimed scope by appending claims and
Equivalent defines.
Claims (7)
1. a smelting process for high-strength micro-alloy rare earth cast steel, uses intermediate frequency furnace to smelt, it is characterised in that
Smelting process comprises the following steps:
1) pretreatment: before Ye Lianing, steel scrap, alloying element and ladle are toasted, reduce the content of wherein aqueous vapor, and remove
The dirt on steel scrap surface and rust；
2) dispensing: the recovery rate of alloying element C, Si, Mn is according to the recovery rate meter of C, Si, Mn in ZG35SiMn low-alloy cast steel
Calculating, the content of microalloy element Nb, Ti, La, Ce requires to carry out proportioning according to the chemical composition of steel；
3) feeding and feed: during charging, large, medium and small metal charge adds according to about 2:3:1, stove put into by bulk metal furnace charge
The end, the space between bulk metal furnace charge and furnace bottom put into by biscuit metal furnace charge, it is ensured that tight upper pine under furnace charge in body of heater；Add stove
Material uses biscuit metal material；
4) alloy is added: after steel scrap is melting down in stove, first pre-add part ferromanganese, Antaciron, the chemistry one-tenth of stokehold to be detected molten steel
After Fen, add final required ferromanganese, Antaciron, and employing further according to testing result and first add ferromanganese, then add the order of ferrosilicon
Add；Nb, Ti, La, Ce alloying element is previously added ladle bottom after drying；In molten steel, carbon dust carburetting is poured into during tapping；
5) tapping: tapping adjust the chemical composition in molten steel according to step 4) after, tapping temperature controls at 1650 DEG C～1680
DEG C, on ladle liquid level, it is sprinkled into appropriate slag former after tapping immediately；
6) final deoxidizing: carry out final deoxidizing with fine aluminium during tapping, in advance fine aluminium block is added ladle bottom, molten steel impact ladle bottom
Time make fine aluminium melt and and molten steel in oxygen react and carry out deoxidation, the addition of fine aluminium be steel quality 0.050%～
0.125%, and ensure that in high-strength micro-alloy rare earth cast steel, the aluminum content of residual is 0.03%～0.08%；
7) cast: by the pouring molten steel in step 6) ladle in preprepared mold, pouring temperature controls at 1550 DEG C
～1580 DEG C, cool down, remove casting mold after obtained be high-strength micro-alloy rare earth cast steel part；Mainization of described cast steel
Study and point include C, Si, Mn, Nb, Ti, Re, La, Ce, P, S, ferrum and micro impurity element, described C, Si, Mn, Nb
, the weight/mass percentage composition of Ti, Re, P, S be respectively C 0.30%～0.40%, Si 0.60%～0.80%, Mn 1.10%～
1.40%, Nb 0.03%～0.09%, Ti 0.01～0.08%, Re 0.01%～0.20%, La0.01%～0.10%, Ce0.01%～
0.15%, P≤0.035%, S≤0.010%.
The smelting process of a kind of high-strength micro-alloy rare earth cast steel the most according to claim 1, it is characterised in that: described
The total content of Nb, Ti, La, Ce is less than or equal to 0.5%.
The smelting process of a kind of high-strength micro-alloy rare earth cast steel the most according to claim 1, it is characterised in that: described
Ferromanganese, Antaciron and Nb, Ti, La, Ce need baking to be dried 2～5h before addition, and baking baking temperature is 100～300 DEG C.
The smelting process of a kind of high-strength micro-alloy rare earth cast steel the most according to claim 1, it is characterised in that: described
Pre-add ferromanganese, the temperature range of Antaciron control, at 1640 DEG C～1660 DEG C, after the ladle chemistry of stokehold to be detected, then to add
Enter final required ferromanganese, Antaciron；The order that twice adds alloy is and first adds manganeisen, treats that manganeisen all melts
Clearly, skim after, add Antaciron.
The smelting process of a kind of high-strength micro-alloy rare earth cast steel the most according to claim 1, it is characterised in that: described
Nb, Ti, La, Ce microalloy element adds ladle bottom with the form of metal dust.
6. the heat treatment method of an a kind of high-strength micro-alloy rare earth cast steel as claimed in claim 1, it is characterised in that:
Including normalized treatment and temper two parts；
Described normalized treatment technique is: be warming up to 860 DEG C～960 with the speed of 80 DEG C/h～120 DEG C/h in chamber type electric resistance furnace
DEG C, temperature retention time is steel-casting thickness (mm) × 1.5～1.8min/h, and then steel-casting is cooled to room temperature in atmosphere；
Described tempering heat treatment process is: in chamber type electric resistance furnace with the speed of 80 DEG C/h～120 DEG C/h be warming up to 600 DEG C～
650 DEG C, temperature retention time is 1.8～2.2min/h, and then steel-casting is cooled to room temperature in atmosphere；
Normalizing is less than 6h with the time interval of tempering.
The heat treatment method of a kind of high-strength micro-alloy rare earth cast steel the most according to claim 6, it is characterised in that: institute
Stating steel-casting after heat treatment, its tensile strength is more than or equal to 720MPa, and yield strength is more than or equal to 430MPa, and percentage elongation is more than
Equal to 10%, the contraction percentage of area is more than or equal to 12%, and impact test temperature is that impact absorbing energy when 5 DEG C is more than or equal to 11.5J.
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| CN105648345B (en) * | 2016-03-02 | 2018-04-06 | 上海市环境工程设计科学研究院有限公司 | High tough high temperature wearable anti-corrosion cast steel of a kind of incineration furnace grate and preparation method thereof |
| WO2018018389A1 (en) * | 2016-07-25 | 2018-02-01 | 顾湘 | High-strength microalloyed rare-earth cast steel |
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