CN110527925A - A kind of cast steel adding rare earth element - Google Patents

A kind of cast steel adding rare earth element Download PDF

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Publication number
CN110527925A
CN110527925A CN201910880787.8A CN201910880787A CN110527925A CN 110527925 A CN110527925 A CN 110527925A CN 201910880787 A CN201910880787 A CN 201910880787A CN 110527925 A CN110527925 A CN 110527925A
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cast steel
rare earth
parts
iron
steel
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CN110527925B (en
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高文通
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Yin Zhou Fuchun Hot Investment Casting Co Ltd Of Ningbo City
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Yin Zhou Fuchun Hot Investment Casting Co Ltd Of Ningbo City
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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/52—Manufacture of steel in electric furnaces
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/04—Removing impurities by adding a treating agent
    • C21C7/06—Deoxidising, e.g. killing
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/04—Removing impurities by adding a treating agent
    • C21C7/068—Decarburising
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/18—Hardening; Quenching with or without subsequent tempering
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/56—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering characterised by the quenching agents
    • C21D1/60—Aqueous agents
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C33/00—Making ferrous alloys
    • C22C33/04—Making ferrous alloys by melting
    • C22C33/06—Making ferrous alloys by melting using master alloys
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/005—Ferrous alloys, e.g. steel alloys containing rare earths, i.e. Sc, Y, Lanthanides
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

Abstract

The present invention relates to cast steel fields, and in particular to a kind of cast steel for adding rare earth element.The invention discloses a kind of cast steels for adding rare earth element, which is characterized in that the cast steel is by percentage to the quality, it consists of the following compositions: C:0.12%~0.28%, Si:0.7%~1.3%, Mn:0.3%~0.9%, Cr:3%~9%, Mo:0.01%~0.5%, V:0.05%~1%, Al:0.01%~0.05%, rare earth elements RE: 0.2%~0.6%, S≤0.03%, P≤0.03%, surplus Fe.Although the cast steel hardness that the present invention solves existing addition rare earth element is very high, often toughness is insufficient.

Description

A kind of cast steel adding rare earth element
Technical field
The present invention relates to cast steel fields, and in particular to a kind of cast steel for adding rare earth element.
Background technique
The materials such as steel due to atmospheric corrosion caused by economic loss occupy very big specific gravity in material failure.And cast steel The steel material very big as the dosage in atmospheric environment is valued by people its corrosive research for a long time.And A large amount of research surface, rare earth element can not only improve the raising of the corrosion resistance of steel by refinement crystal grain etc., moreover it is possible to Other special-effects are enough generated, such as addition rare-earth yttrium can be improved the high-temperature oxidation resistance of stainless steel.
China is rare earth resources and yield rare earth big country the most abundant in the world, while being also the steel of output of steel first Big country, if it is possible to the beneficial effect that rare earth plays carbon steel is efficiently used, it is micro- by being added in mild steel and steel alloy The rare earth of amount, to improve the quality of steel to enhance the international competitiveness of China's steel.However, existing addition rare earth element Although cast steel hardness is very high, often toughness is insufficient.
Summary of the invention
In view of the above-mentioned problems, the present invention provide it is a kind of add rare earth element cast steel, by percentage to the quality, by below at It is grouped as:
C:0.12%~0.28%, Si:0.7%~1.3%, Mn:0.3%~0.9%, Cr:3%~9%, Mo: 0.01%~0.5%, V:0.05%~1%, Al:0.01%~0.05%, rare earth elements RE: 0.2%~0.6%, S≤ 0.03%, P≤0.03%, surplus Fe；
The rare earth elements RE is made of the mixture that mass ratio is La:Ce:Y=1~4:6:2；
The raw material of the cast steel, consist of the following compositions in parts by weight:
40~50 parts of the pig iron, 15~25 parts of steel scrap, 2.5~4.5 parts of ferrosilicon, 1.2~2.4 parts of manganese iron, 7~15 parts of ferrochrome, 0.2~2 part of molybdenum-iron, 1.1~2.1 parts of vanadium iron, 0.01~0.05 part of aluminum shot, 0.3~0.8 part of rare earth elements RE.
Preferably, the cast steel by percentage to the quality, consists of the following compositions:
C:0.18%~0.22%, Si:1.0%~1.2%, Mn:0.7%~0.9%, Cr:5%~7%, Mo: 0.05%~0.1%, V:0.05%~1%, Al:0.03%~0.04%, rare earth elements RE: 0.3%~0.5%, S≤ 0.03%, P≤0.03%, surplus Fe；
The rare earth elements RE is made of the mixture that mass ratio is La:Ce:Y=3:6:2；
The raw material of the cast steel, consist of the following compositions in parts by weight:
44~48 parts of the pig iron, 28~22 parts of steel scrap, 3.8~4.3 parts of ferrosilicon, 2.0~2.4 parts of manganese iron, 9~12 parts of ferrochrome, 0.8~1.2 part of molybdenum-iron, 1.1~2.1 parts of vanadium iron, 0.03~0.05 part of aluminum shot, 0.5~0.7 part of rare earth elements RE.
It is a further object to provide a kind of preparation methods of cast steel for adding rare earth element, including following step It is rapid:
Step 1, La, Ce and Y are weighed according to quantity and is placed in mechanical ball mill in ball mill under conditions of argon gas protection, obtain nanometer Rare earth elements RE；
Step 2, weigh according to quantity the pig iron and steel scrap investment electric furnace in melt, be added according to quantity weighed ferrosilicon, manganese iron, ferrochrome, Molybdenum-iron, vanadium iron, desulfurization after thawing, make S≤0.005%；Dephosphorization makes P≤0.005%；Slagging-off obtains mixing molten steel；
Step 3, by mixing molten steel through in ladle injection AOD furnace, oxygen decarburization makes carbon content reach technique requirement；
Step 4, the molten steel after step 3 decarburization is transferred in refining furnace, detects the content of each element, adds according to testing result Add one of ferrosilicon, manganese iron, ferrochrome, molybdenum-iron, vanadium iron or a variety of, adjust the content of each element, until reaching technique requirement, obtains To refining liquid steel；
Step 5, the oxygen content of refining liquid steel is detected, aluminum shot deoxidation is added, until the oxygen content of refining liquid steel is reduced to 200ppm, slagging-off；Stove evacuation will be refined, argon gas is passed through, keeps pressure in 15~20Pa, Nano Rare prepared by step 1 is added Earth elements RE is warming up to 1590~1610 DEG C, stirs 20~30min；
Step 6, cast molding obtains cast steel material, through Overheating Treatment, obtains the cast steel of addition rare earth element.
Preferably, the step of being heat-treated described in step 6 are as follows:
1) cast steel material is heated to 1060~1080 DEG C, keeps the temperature 2~4h, cools to room temperature with the furnace；
2) with the oxide layer on sander removal cast steel material surface；
3) cast steel material after polishing is heated to 880~920 DEG C, keeps the temperature 1~3h, it is cooling；
4) step 3) cast steel material after cooling is tempered at a temperature of 250~260 DEG C, keeps the temperature 1~3h, is air-cooled to room Temperature.
It is highly preferred that cast steel material is heated to 1070 DEG C, keeps the temperature 3h in the step 1).
It is highly preferred that the cast steel material after polishing is heated to 900 DEG C, keeps the temperature 2h in the step 3).
It is highly preferred that being cooled down in the step 3) using cooling medium, the cooling medium is the CaCl of saturation2 Solution.
It is highly preferred that the step 4) is, step 3) cast steel material after cooling is tempered at a temperature of 480 DEG C, is kept the temperature 2h is air-cooled to room temperature.
The invention has the benefit that
1. realize that cast steel deoxidation largely uses aluminum shot in the prior art, and the situation that aluminum shot is relatively low in oxygen content Under must largely add, and have little effect, the present invention, instead of a large amount of aluminum shot, has been reached and expected using a small amount of rare earth element Less than effect.Firstly, the fusing point for the rare earth elements RE added in the present invention is lower than molten steel temperature, therefore can be real in molten steel Now quickly dissolution and fusing；Secondly, have between rare earth elements RE and oxygen it is strong combine can, situation that can be lower in oxygen content Under, reaction in-situ occurs with oxygen and generates rare earth oxide.Therefore, the present invention by control oxygen and adds quantitative rare earth elements RE not The use for addressing only a large amount of aluminum shots extends the post-processing problem of steel-making time and slag particle；And the rare earth oxide that reaction generates The creep rupture strength that cast steel can also significantly be improved, reduces the creep rate of cast steel, improves the high-temperature mechanical property of cast steel；This Outside, rare earth metal RE can also be to Al2O3Equal field trashes play metamorphism, generate REAlO3Equal re inclusions, can greatly improve casting The fatigue life of steel.
2. rare earth elements RE used in the present invention has La, Ce and Y, the combination of La, Ce oxide, which has, improves cast steel corrosion resistant It loses, the performance of resistance to oxidation, the combination of Ce, Y oxide can be improved the dispersion hardening and mechanical performance resistant to high temperature of cast steel, lead to Reasonable proportion is crossed by after three kinds of rare earth elements mixing, the crystal grain refinement of cast steel can be made, improve yield strength, the plasticity of cast steel And toughness；Austenite bainite changes when slowing down cast steels melting, is conducive to the harden ability for improving steel.In addition, in wear-resisting, resistance to height The aspect of performance such as warm, corrosion-resistant are promoted.
3. heat treatment process of the invention uses the step of annealing-polishing-quenching-tempering, there is the cast iron prepared Higher hardness and tensile strength.Wherein, in heat treatment process step 1), the hardness of cast steel with annealing temperature raising And increase, when reaching within the scope of 1060~1080 DEG C, hardness is maximum；In heat treatment step 2) in, it is gone by the way of polishing Except the oxide layer that cast steel surface is generated by calcination, be conducive to the effect of subsequent quenching and tempering；In heat treatment step 3) in, The present invention uses a kind of CaCl that low-cost cooling medium is saturated2Solution is cooling after being quenched, which has high temperature The characteristic of rapid cooling medium temperature slow cooling, i.e., when sample is begun to cool, the water contained in cooling medium can be such that steel is quickly cooled down, and prevent steel In there is pro-eutectoid ferrite and pearlite, when water vapor completely after cooling medium will be sintered on the surface of the workpiece, play guarantor The effect of temperature extends middle warm area fringe time, and therefore, the cast steel low-temperature impact toughness obtained in this way can greatly promote；In Heat treatment step 4) in, with the raising of tempering temperature, the toughness of cast steel first increases to be reduced afterwards, and tensile strength gradually increases, this The tempering temperature of invention setting is lower than the prior art, and tempering temperature is set as 250~260 DEG C, is tempered within this temperature range, Cast steel toughness after cooling can then reach best state.
4. cast steel prepared by the present invention not only yield strength with higher, toughness also with higher, and system used Preparation Method is simply easily controllable, suitable for the application in terms of industrial production.
Specific embodiment
In order to make it easy to understand, the present invention is described in detail below by specific embodiment.It needs to particularly point out It is that specific embodiment is merely to explanation, it is clear that those skilled in the art can carry out the present invention each according to illustrating herein Kind amendment changes, these modifications and variations will be also included within the scope of the application.
Embodiment 1
A kind of preparation method for the cast steel adding rare earth element, comprising the following steps:
Step 1,0.12 part of La, 0.36 part of Ce and 0.12 part of Y are weighed and is placed in machine in ball mill under conditions of argon gas protection Tool ball milling obtains nano rare earth elements RE；
Step 2, it weighs and melts in 45 parts of pig iron and 20 parts of steel scrap investment electric furnaces, 3 parts of ferrosilicon, 1.8 parts of manganese iron, 12 parts are added Ferrochrome, 1.2 parts of molybdenum-irons, 1.6 parts of vanadium iron, desulfurization after thawing make S≤0.005%；Dephosphorization makes P≤0.005%；Slagging-off, obtains Mix molten steel；
Step 3, by mixing molten steel through in ladle injection AOD furnace, oxygen decarburization makes carbon content reach technique requirement；
Step 4, the molten steel after step 3 decarburization is transferred in refining furnace, detects the content of each element, and according to testing result One of ferrosilicon, manganese iron, ferrochrome, molybdenum-iron, vanadium iron or a variety of are added, the content of each element is adjusted, until reach technique requirement, Obtain refining liquid steel；
Step 5,0.03 part of aluminum shot deoxidation is added in the oxygen content for detecting refining liquid steel, until the oxygen content of refining liquid steel drops Down to 200ppm, slagging-off；Stove evacuation will be refined, argon gas is passed through, keeps pressure in 18Pa, Nano Rare prepared by step 1 is added Earth elements RE is warming up to 1600 DEG C, stirs 25min；
Step 6, cast molding obtains cast steel material；
Step 7, it is heat-treated:
1) cast steel material is heated to 1070 DEG C, keeps the temperature 3h, cools to room temperature with the furnace；
2) with the oxide layer on sander removal cast steel material surface；
3) cast steel material after polishing is heated to 900 DEG C, 2h is kept the temperature, with the CaCl of saturation2Solution is as cooling medium Carry out cooling treatment；
4) step 3) cast steel material after cooling is tempered at a temperature of 255 DEG C, keeps the temperature 2h, is air-cooled to room temperature；
Obtain the cast steel of product addition rare earth element.
Through detecting, each element content of the product cast steel as made from above-mentioned preparation method are as follows:
C:0.2%, Si:1.2%, Mn:0.8%, Cr:6%, Mo:0.36%, V:0.71%, Al:0.03%, La: 0.08%, Ce:0.24%, Y:0.08%, S:0.012%, P:0.008%, surplus are Fe and inevitable impurity.
Embodiment 2
A kind of preparation method for the cast steel adding rare earth element, comprising the following steps:
Step 1,0.04 part of La, 0.12 part of Ce and 0.04 part of Y are weighed and is placed in machine in ball mill under conditions of argon gas protection Tool ball milling obtains nano rare earth elements RE；
Step 2, it weighs and melts in 40 parts of pig iron and 15 parts of steel scrap investment electric furnaces, 2.5 parts of ferrosilicon, 1.2 parts of manganese iron, 7 are added Part ferrochrome, 0.2 part of molybdenum-iron, 1.1 parts of vanadium iron, desulfurization after thawing make S≤0.005%；Dephosphorization makes P≤0.005%；Slagging-off, obtains To mixing molten steel；
Step 3, by mixing molten steel through in ladle injection AOD furnace, oxygen decarburization makes carbon content reach technique requirement；
Step 4, the molten steel after step 3 decarburization is transferred in refining furnace, detects the content of each element, and according to testing result One of ferrosilicon, manganese iron, ferrochrome, molybdenum-iron, vanadium iron or a variety of are added, the content of each element is adjusted, until reach technique requirement, Obtain refining liquid steel；
Step 5,0.01 part of aluminum shot deoxidation is added in the oxygen content for detecting refining liquid steel, until the oxygen content of refining liquid steel drops Down to 200ppm, slagging-off；Stove evacuation will be refined, argon gas is passed through, keeps pressure in 15Pa, Nano Rare prepared by step 1 is added Earth elements RE is warming up to 1590 DEG C, stirs 20min；
Step 6, cast molding obtains cast steel material；
Step 7, it is heat-treated:
1) cast steel material is heated to 1060 DEG C, keeps the temperature 2h, cools to room temperature with the furnace；
2) with the oxide layer on sander removal cast steel material surface；
3) cast steel material after polishing is heated to 880 DEG C, 1h is kept the temperature, with the CaCl of saturation2Solution is as cooling medium Carry out cooling treatment；
4) step 3) cast steel material after cooling is tempered at a temperature of 250 DEG C, keeps the temperature 1h, is air-cooled to room temperature；
Obtain the cast steel of product addition rare earth element.
Through detecting, each element content of the product cast steel as made from above-mentioned preparation method are as follows:
C:0.13%, Si:0.8%, Mn:0.3%, Cr:3.7%, Mo:0.07%, V:0.12%, Al:0.01%, La: 0.04%, Ce:0.12%, Y:0.04%, S:0.025%, P:0.018%, surplus are Fe and inevitable impurity.
Embodiment 3
A kind of raw material for the cast steel adding rare earth element, consist of the following compositions in parts by weight:
50 parts of the pig iron, 25 parts of steel scrap, 4.5 parts of ferrosilicon, 2.4 parts of manganese iron, 15 parts of ferrochrome, 2 parts of molybdenum-iron, 2.1 parts of vanadium iron, aluminum shot 0.05 part, 0.16 part of rare-earth elements La, 0.48 part of rare earth element ce, 0.16 part of rare earth element y；
The preparation method of the cast steel of above-mentioned addition rare earth element, comprising the following steps:
Step 1,0.16 part of La, 0.48 part of Ce and 0.16 part of Y are weighed and is placed in machine in ball mill under conditions of argon gas protection Tool ball milling obtains nano rare earth elements RE；
Step 2, it weighs and melts in 50 parts of pig iron and 25 parts of steel scrap investment electric furnaces, 4.5 parts of ferrosilicon, 2.4 parts of manganese iron, 15 are added Part ferrochrome, 2 parts of molybdenum-irons, 2.1 parts of vanadium iron, desulfurization after thawing make S≤0.005%；Dephosphorization makes P≤0.005%；Slagging-off, obtains Mix molten steel；
Step 3, by mixing molten steel through in ladle injection AOD furnace, oxygen decarburization makes carbon content reach technique requirement；
Step 4, the molten steel after step 3 decarburization is transferred in refining furnace, detects the content of each element, and according to testing result One of ferrosilicon, manganese iron, ferrochrome, molybdenum-iron, vanadium iron or a variety of are added, the content of each element is adjusted, until reach technique requirement, Obtain refining liquid steel；
Step 5,0.05 part of aluminum shot deoxidation is added in the oxygen content for detecting refining liquid steel, until the oxygen content of refining liquid steel drops Down to 200ppm, slagging-off；Stove evacuation will be refined, argon gas is passed through, keeps pressure in 20Pa, Nano Rare prepared by step 1 is added Earth elements RE is warming up to 1610 DEG C, stirs 30min；
Step 6, cast molding obtains cast steel material；
Step 7, it is heat-treated:
1) cast steel material is heated to 1080 DEG C, keeps the temperature 4h, cools to room temperature with the furnace；
2) with the oxide layer on sander removal cast steel material surface；
3) cast steel material after polishing is heated to 880 DEG C, 3h is kept the temperature, with the CaCl of saturation2Solution is as cooling medium Carry out cooling treatment；
4) step 3) cast steel material after cooling is tempered at a temperature of 260 DEG C, keeps the temperature 3h, is air-cooled to room temperature；
Finally obtain the cast steel of product addition rare earth element.
Through detecting, each element content of the product cast steel as made from above-mentioned preparation method are as follows:
C:0.22%, Si:1.2%, Mn:0.9%, Cr:7%, Mo:0.1%, V:0.98%, Al:0.04%, La: 0.16%, Ce:0.48%, Y:0.16%, S:0.025%, P:0.018%, surplus are Fe and inevitable impurity.
Comparative example 1
A kind of commercially available cast steel added with rare earth element, quantization, which studies, by mass percentage is divided into: C:0.11~ 0.14；Si:0.20~0.30；Mn:0.80~1.0；Cr:9.00~9.60；Mo:1.40~1.60；Ni:0.10~0.20；Co: 0.90~1.10；V:0.18~0.22；N:0.015~0.030；Nb:0.05~0.07；B:0.008~0.013；Rare earth: 0.01 ~0.05；P≤0.015；S≤0.010；Cu≤0.10；As≤0.025；Sb≤0.001；Sn≤0.015；A1≤0.010；H≤ 7ppm；O≤90ppm, remaining is Fe and inevitable impurity；Wherein, rare earth is by two kinds or more in Ce, La, Y, Pr, Nd The mischmetal of kind composition.
For the contents of the present invention that illustrate being more clear, the present invention is to embodiment 1, embodiment 2, embodiment 3 and comparison Example 1 has carried out performance detection, and the results are shown in Table 1:
1 performance test results of table
As seen from the above table, although in terms of hardness, cast steel prepared by the embodiment of the present invention 1,2,3 is slightly below comparative example 1；But in 3 embodiments of the invention, tensile strength is in 1000MPa or so, and for impact flexibility (- 40 DEG C) in 50J or so, surrender is strong > 800MPa, elongation percentage > 20%, contraction percentage of area > 35% are spent, above-mentioned performance is above comparative example 1.
Finally it should be noted that the above embodiments are merely illustrative of the technical solutions of the present invention, rather than the present invention is protected The limitation of range is protected, although explaining in detail referring to preferred embodiment to the present invention, those skilled in the art are answered Work as understanding, it can be with modification or equivalent replacement of the technical solution of the present invention are made, without departing from the reality of technical solution of the present invention Matter and range.

Claims (8)

1. a kind of cast steel for adding rare earth element, which is characterized in that the cast steel by percentage to the quality, consists of the following compositions:
C:0.12%~0.28%, Si:0.7%~1.3%, Mn:0.3%~0.9%, Cr:3%~9%, Mo:0.01%~ 0.5%, V:0.05%~1%, Al:0.01%~0.05%, rare earth elements RE: 0.2%~0.6%, S≤0.03%, P≤ 0.03%, surplus Fe；
The rare earth elements RE is made of the mixture that mass ratio is La:Ce:Y=1~4:6:2；
The raw material of the cast steel, consist of the following compositions in parts by weight:
40~50 parts of the pig iron, 15~25 parts of steel scrap, 2.5~4.5 parts of ferrosilicon, 1.2~2.4 parts of manganese iron, 7~15 parts of ferrochrome, molybdenum-iron 0.2~2 part, 1.1~2.1 parts of vanadium iron, 0.01~0.05 part of aluminum shot, 0.3~0.8 part of rare earth elements RE.
2. the cast steel of addition rare earth element according to claim 1, which is characterized in that by percentage to the quality, the casting Steel consists of the following compositions:
C:0.18%~0.22%, Si:1.0%~1.2%, Mn:0.7%~0.9%, Cr:5%~7%, Mo:0.05%~ 0.1%, V:0.05%~1%, Al:0.03%~0.04%, rare earth elements RE: 0.3%~0.5%, S≤0.03%, P≤ 0.03%, surplus Fe；
The rare earth elements RE is made of the mixture that mass ratio is La:Ce:Y=3:6:2；
The raw material of the cast steel, consist of the following compositions in parts by weight:
44~48 parts of the pig iron, 28~22 parts of steel scrap, 3.8~4.3 parts of ferrosilicon, 2.0~2.4 parts of manganese iron, 9~12 parts of ferrochrome, molybdenum-iron 0.8~1.2 part, 1.1~2.1 parts of vanadium iron, 0.03~0.05 part of aluminum shot, 0.5~0.7 part of rare earth elements RE.
3. a kind of preparation method of cast steel is used to prepare the cast steel of addition rare earth element as claimed in claim 1 or 2, It is characterized in that, comprising the following steps:
Step 1, La, Ce and Y are weighed according to quantity and is placed in mechanical ball mill in ball mill under conditions of argon gas protection, obtain nano rare earth Elements RE；
Step 2, weigh according to quantity the pig iron and steel scrap investment electric furnace in melt, be added according to quantity weighed ferrosilicon, manganese iron, ferrochrome, molybdenum-iron, Vanadium iron, desulfurization after thawing, makes S≤0.005%；Dephosphorization makes P≤0.005%；Slagging-off obtains mixing molten steel；
Step 3, by mixing molten steel through in ladle injection AOD furnace, oxygen decarburization makes carbon content reach technique requirement；
Step 4, the molten steel after step 3 decarburization is transferred in refining furnace, detects the content of each element, adds silicon according to testing result One of iron, manganese iron, ferrochrome, molybdenum-iron, vanadium iron are a variety of, adjust the content of each element, until reaching technique requirement, obtain essence Make steel liquid；
Step 5, the oxygen content of refining liquid steel is detected, aluminum shot deoxidation is added, until the oxygen content of refining liquid steel is reduced to 200ppm, Slagging-off；Stove evacuation will be refined, argon gas is passed through, keeps pressure in 15~20Pa, nano rare earth element prepared by step 1 is added RE is warming up to 1590~1610 DEG C, stirs 20~30min；
Step 6, cast molding obtains cast steel material, through Overheating Treatment, obtains the cast steel of addition rare earth element.
4. the preparation method of cast steel according to claim 3, which is characterized in that the step of being heat-treated in the step 6 has Body is as follows:
1) cast steel material is heated to 1060~1080 DEG C, keeps the temperature 2~4h, cools to room temperature with the furnace；
2) with the oxide layer on sander removal cast steel material surface；
3) cast steel material after polishing is heated to 880~920 DEG C, keeps the temperature 1~3h, it is cooling；
4) step 3) cast steel material after cooling is tempered at a temperature of 250~260 DEG C, keeps the temperature 1~3h, is air-cooled to room temperature.
5. the preparation method of cast steel according to claim 4, which is characterized in that in the step 1), by cast steel material plus Heat keeps the temperature 3h to 1070 DEG C.
6. the preparation method of cast steel according to claim 4, which is characterized in that in the step 3), by the casting after polishing Steel material is heated to 900 DEG C, keeps the temperature 2h.
7. the preparation method of cast steel according to claim 4, which is characterized in that in the step 3), using cooling medium It is cooled down, the cooling medium is the CaCl of saturation2Solution.
8. the preparation method of cast steel according to claim 5, which is characterized in that the step 4) is, step 3) is cooling Cast steel material afterwards is tempered at a temperature of 480 DEG C, is kept the temperature 2h, is air-cooled to room temperature.
CN201910880787.8A 2019-09-18 2019-09-18 Cast steel added with rare earth elements Expired - Fee Related CN110527925B (en)

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