CN108246982A - A kind of preparation method of slim rich chromium cast iron pipe - Google Patents
A kind of preparation method of slim rich chromium cast iron pipe Download PDFInfo
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- CN108246982A CN108246982A CN201711393772.6A CN201711393772A CN108246982A CN 108246982 A CN108246982 A CN 108246982A CN 201711393772 A CN201711393772 A CN 201711393772A CN 108246982 A CN108246982 A CN 108246982A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/22—Moulds for peculiarly-shaped castings
- B22C9/24—Moulds for peculiarly-shaped castings for hollow articles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C3/00—Selection of compositions for coating the surfaces of moulds, cores, or patterns
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/02—Sand moulds or like moulds for shaped castings
-
- 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
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- 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
- C21D1/26—Methods of annealing
-
- 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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/08—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tubular bodies or pipes
- C21D9/085—Cooling or quenching
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- 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
- C22C33/00—Making ferrous alloys
- C22C33/08—Making cast-iron alloys
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C37/00—Cast-iron alloys
- C22C37/06—Cast-iron alloys containing chromium
- C22C37/08—Cast-iron alloys containing chromium with nickel
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C37/00—Cast-iron alloys
- C22C37/10—Cast-iron alloys containing aluminium or silicon
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- 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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
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- 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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
-
- 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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/56—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.7% by weight of carbon
Abstract
The present invention relates to tubing technical field more particularly to a kind of preparation method of slim rich chromium cast iron pipe, including：(1) steel scrap, ferrochrome, ferrosilicon, ferromanganese and electrolytic nickel are chosen and is put into medium frequency induction melting furnace and is smelted, vanadium iron is added in after it is completely melt, slag former slagging-off is added in after its fusing, obtains mixture I；(2) it is blown into inert gas from melting furnace bottom to be stirred, while self-thermo furnace top is blown into the inert gas for being mixed with oxygen；(3) deoxidation treatment；(4) it is poured into a mould when molten iron temperature control is to 1600~1650 DEG C；When casting temperature is less than 250 DEG C of shake outs；(5) annealing, quenching treatment；(6) temper；Up to the slim rich chromium cast iron pipe；The present invention by the improvement for the treatment of process, improve decarburization in rich chromium cast iron pipe, dephosphorization effect, improve hardness, the cracking resistance of its finished product；Meanwhile the fastidious technology difficulty for reducing slim rich chromium cast iron pipe for passing through casting craft.
Description
Technical field
The present invention relates to tubing technical field more particularly to a kind of preparation methods of slim rich chromium cast iron pipe.
Background technology
Cast iron pipe is the pipe of cylinder iron cast molding as its name suggests.Traditional, cast iron pipe is widely used in feeding water, arrange
Water and gas conveying tube line；In industrial heat galvanic couple, also exist a kind of added with high chromium alloy material and through special process one
The rich chromium cast iron pipe of secondary property casting and forming, its protection sleeve pipe as industrial heat galvanic couple have wear-resistant, corrosion-resistant, resistance to height
The features such as temperature and heat conduction are excellent, be operated in washed away with burn into, ideal thermocouple protective casing under hot conditions, can be
It is used for a long time within 1100 DEG C, maximum operating temperature is 1200 DEG C, stable and reliable for performance, can improve the service life of thermocouple
Decades of times.It is the best protection casing of the temperature measuring equipments such as sulphuric acid fluidized bed roaster, carbon baking furnace, non-ferrous smelting furnace.
The measurement end that the thickness of rich chromium cast iron pipe is timely transmitted to the temperature of testing medium thermocouple is affected,
If the wall thickness of rich chromium cast iron pipe is larger, effect wear-resisting, wear-resistant well can be no doubt played, still, for heat
Transmitting has certain hysteresis quality, for needing accurate control temperature or the fast-changing place of temperature, the excessive Gao Ge of wall thickness
Cast iron pipe produces large effect for the temperature survey of thermocouple, and thermocouple may be caused not adapt to place premise temperature
Quick, efficient measurement, in addition, reduce rich chromium cast iron pipe wall thickness for cost control be also it is extremely advantageous.It is for this purpose, thin
Type rich chromium cast iron pipe comes into being, and still, in the prior art, in order to obtain excellent abrasion resistance, needs to select complicated component
Alterant, increase the difficulty of smelting process, while the addition of alterant is so that the mobility of alloying component is deteriorated, and unfavorable
In the molding of thin-wall pipe.
Invention content
In view of this, the purpose of the present invention is to provide a kind of preparation method of slim rich chromium cast iron pipe, slim height is reduced
The smelting difficulty of chrome cast iron pipe, improves its yield rate.
To achieve these goals, the present invention is achieved by the following scheme：A kind of slim rich chromium cast iron pipe
Preparation method includes the following steps：
(1) steel scrap, ferrochrome, ferrosilicon, ferromanganese and electrolytic nickel are chosen and is put into medium frequency induction melting furnace and is smelted, treats it
Vanadium iron is added in after being completely melt, slag former slagging-off is added in after its fusing, obtains mixture I；
(2) it is blown into inert gas from melting furnace bottom to be stirred, while self-thermo furnace top is blown into the inertia for being mixed with oxygen
Gas；
(3) mixture I is warming up to 1560~1580 DEG C, adds in aluminium powder and carry out deoxidation treatment as deoxidier；
(4) casting sand mold of the slim rich chromium cast iron pipe is manufactured using water-glass sand, treats molten iron temperature control to 1600~1650
DEG C when poured into a mould；When casting temperature is less than 250 DEG C of shake outs；
(5) annealing, quenching treatment：By the shove charge below 200 DEG C of pending workpiece, then it is warming up to the speed of 50 DEG C/h
500 DEG C, 1~1.5h is kept the temperature, is then warming up to 1050 DEG C to be no more than the temperature rise speed of 100 DEG C/h, keeps the temperature 1~2h, then will
Workpiece quick tapping carries out air quenching；
(6) temper：250~300 DEG C are warming up to the temperature rise speed of 40 DEG C/h, 1.3~1.5h is kept the temperature, then proceedes to
450~500 DEG C are warming up to, 2~3h is kept the temperature, is subsequently cooled to room temperature to get the slim rich chromium cast iron pipe.
In the present invention, it is blown by inert gas to the bottom of smelting furnace, oxygen is mixed with reference to what self-thermo furnace top was blown into
Inert gas, sufficient carbonization treatment is carried out to the molten iron that is completely melt；In addition, by the reinforcement of stirring action in molten bath,
Slag fluidity improves, more conducively the effect of dephosphorization.Under preferable case, in the step (2), self-thermo furnace top is blown into mixed
Have in the inert gas of oxygen, the volume ratio of inert gas and oxygen is 1：(0.3~0.6).
Using being poured into a mould at a high temperature of 1600~1650 DEG C, the flow effect of molten iron is improved, reduces slim rich chromium cast iron
The technology difficulty of pipe in addition in shake out, controls the temperature of casting less than 250 DEG C, and casting cannot be encountered during shake out
Part.
Further, according to the present invention, in the step (4), water-glass sand molding sand intracavitary is painted with Zircon powder alcohol group
Coating.The Zircon powder alcohol group dope includes 80~85% zirconium English powder, 1~2.5% binding agent, 2~2.8% suspension
Agent, 0.1~0.4% auxiliary agent, remaining is isopropanol, and the percentage composition is mass percent.Wherein, the binding agent
It is organobentonite that such as phenolic resin, the suspending agent, which can be enumerated, and the auxiliary agent is antifoaming agent.
Further, it according to the present invention, in the step (4), after the molten iron of cast 1/2, is spread on molten iron level
Upper antioxidant, the dosage of the antioxidant are the 0.2~0.8% of weight of molten iron, then proceed to pour molten iron.Specifically
, the antioxidant can enumerate such as RLHY-31 (purchased from Beijing Rong Li Heng Ye Science and Technology Ltd.s), RLHY-12 and (be purchased from
Beijing Rong Li Heng Ye Science and Technology Ltd.s).It is covered on molten iron by the antioxidant, prevents gas from entering in molten iron, improved
Anti-oxidation ability.
Further, it in the step (6), is set on the slim rich chromium cast iron pipe of cooling and shaping along its pipe range side
Cutting to arrangement is stitched, and the thermometric end of the cutting seam far from thermocouple is set, and the length for cutting seam is less than slim high chromium casting
The pipe range of iron pipe, and the tube wall between adjacent cutting seam curves inwardly in the circumferential, it is adjacent in the circumferential to cut under preferable case
Spacing between slot is 1~1.5mm.When specifically used, the setting stitched by the cutting, when the rich chromium cast iron pipe sleeve is connected on heat
In galvanic couple protection pipe, the coupling mechanism force of the slim rich chromium cast iron pipe and protecting tube is not only increased, meanwhile, by the external world
During impact, which can effectively improve shock proof ability, it is ensured that the service life of the thermocouple.
Slim rich chromium cast iron pipe of the present invention includes the component of following weight percentage：C 1.5~2.9%, Cr
25~30%, Mn 0.8~1.2%, Mo 0.1~0.5%, V 0.4~1.3%, Ni 0.2~0.6%, Al 0.2~
1.0%th, Si≤1.0%, surplus Fe；
In the rich chromium cast iron pipe, the content of control P, S are less than 0.02%；
The selection of chemical composition of the present invention and its proportioning composition so that casting is both resisted with enough intensity and toughness
The trend of cracking, and reach corresponding hardness requirement, and meet preferable Production Practice of Casting Technologies.
C, Cr elements are very crucial in rich chromium cast iron component, and which determine the quantity and class of the carbide in rich chromium cast iron
Type, and the quantity of carbide and type and the intensity and abrasion resistance of material are closely related, it is contemplated that take into account hardness and wear-resistant
Performance and the crack resistance when being cast as slim rich chromium cast iron pipe, in rich chromium cast iron pipe of the present invention, the percentage composition of C
Percentage composition for 1.5~2.9%, Cr is 25~30%.
Mn elements can expand austenite phase field accordingly in the component of rich chromium cast iron pipe, be the stable element of austenite,
But Mn it is violent reduce Ms point temperature so that rich chromium cast iron pipe there are more retained austenite, is unfavorable for after quenching
Wear resistence, according to the present invention, percentage composition of the Mn elements in rich chromium cast iron pipe is 0.8~1.2%；Ni elements are not allowed
Readily carbonizable substance can effectively improve quenching degree in the base, but Ni can also reduce Ms point temperature, be unfavorable for carrying for abrasion resistance
Height, therefore, in the present invention, the percentage composition of Ni elements is 0.2~0.6%.
Si elements reduce the quenching degree of rich chromium cast iron pipe as the graphitizing element in rich chromium cast iron pipe, but Si
There is the effect of deoxidation, the form of carbide can be improved, therefore, in rich chromium cast iron pipe of the present invention, answer suitable control Si first
The percentage composition of element makes its percentage composition be no more than 1.0%.In the present invention, P element and S elements can in rich chromium cast iron pipe shape
Into being mingled with, material formation is isolated, it is very big on the tearing tendency influence of follow-up finished product, stringent controller content is needed, the present invention
In, the content of P, S should strictly be controlled to be less than 0.02%.
Further, according to the present invention, the slim rich chromium cast iron pipe includes the component of following weight percentage：C
1.8~2.5%, Cr 26~29%, Mn 0.9~1.1%, Mo 0.2~0.4%, V 0.5~1.1%, Ni0.3~0.5%,
Al 0.3~0.8%, surplus Fe.
It is further preferred that the slim rich chromium cast iron pipe includes the component of following weight percentage：C2.3wt%,
Cr 28wt%, Mn 1.0wt%, Mo 0.3wt%, V 0.8wt%, Ni 0.4wt%, Al 0.6wt%, surplus Fe.
Compared with prior art, the preparation method of slim rich chromium cast iron pipe provided by the invention, passes through changing for treatment process
Into, improve decarburization in rich chromium cast iron pipe, dephosphorization effect, improve hardness, the cracking resistance of its finished product；Meanwhile by pouring work
The fastidious technology difficulty for reducing slim rich chromium cast iron pipe of skill.
Specific embodiment
In order to be easy to understand the technical means, the creative features, the aims and the efficiencies achieved by the present invention, tie below
Specific embodiment is closed, the present invention is furture elucidated.
Embodiment 1
A kind of slim rich chromium cast iron pipe includes the component of following weight percentage：C 2.3wt%, Cr 28wt%, Mn
1.0wt%, Mo 0.3wt%, V 0.8wt%, Ni 0.4wt%, Al 0.6wt%, Si≤1.0wt%, surplus Fe；
In the rich chromium cast iron pipe, the content of control P, S are less than 0.02wt%；
The preparation method of above-mentioned slim rich chromium cast iron pipe includes：
(1) steel scrap, ferrochrome, ferrosilicon and manganese are matched by standard of the weight percentage of above-mentioned C, Cr, Mn, Si, S, P
Iron；Vanadium iron is matched by standard of the weight percentage of V, Mo；Electricity is matched by standard of the weight percentage of Ni
Solve nickel；
Steel scrap, ferrochrome, ferrosilicon, ferromanganese and electrolytic nickel and being put into medium frequency induction melting furnace is smelted, treats it completely
Vanadium iron is added in after fusing, slag former slagging-off is added in after its fusing, obtains mixture I；
(2) it is blown into inert gas from melting furnace bottom to be stirred, while self-thermo furnace top is blown into the inertia for being mixed with oxygen
Gas, wherein, in the mixed gas that self-thermo furnace top is blown into, the volume ratio of inert gas and oxygen is 1：0.4.
(3) mixture I is warming up to 1570 DEG C, adds in aluminium powder and carry out deoxidation treatment as deoxidier；
(4) casting sand mold of the slim rich chromium cast iron pipe is manufactured using water-glass sand, water-glass sand molding sand intracavitary is painted with
Zircon powder alcohol group dope, the Zircon powder alcohol group dope include 83% zirconium English powder, 1.5% phenolic resin, 2.5% it is outstanding
Floating agent, 0.3% antifoaming agent, remaining is isopropanol, and the percentage composition is mass percent；
It is poured into a mould when molten iron temperature control is to 1630 DEG C；After the molten iron of cast 1/2, sprinkled on molten iron level anti-oxidation
The dosage of agent RLHY-31, the antioxidant RLHY-31 are the 0.5% of weight of molten iron, then proceed to pour molten iron；
When casting temperature is less than 250 DEG C of shake outs；
(5) annealing, quenching treatment：By the shove charge below 200 DEG C of pending workpiece, then it is warming up to the speed of 50 DEG C/h
500 DEG C, 1.2h is kept the temperature, is then warming up to 1050 DEG C to be no more than the temperature rise speed of 100 DEG C/h, 1.5h is kept the temperature, then by workpiece
Quick tapping carries out air quenching；
(6) temper：280 DEG C are warming up to the temperature rise speed of 40 DEG C/h, 1.4h is kept the temperature, then proceedes to be warming up to 480
DEG C, 3h is kept the temperature, is subsequently cooled to room temperature to get the slim rich chromium cast iron pipe.
Embodiment 2
A kind of slim rich chromium cast iron pipe includes the component of following weight percentage：C 1.8wt%, Cr 26wt%, Mn
0.9wt%, Mo 0.2wt%, V 0.5wt%, Ni 0.3wt%, Al 0.3wt%, Si≤1.0wt%, surplus Fe；
In the rich chromium cast iron pipe, the content of control P, S are less than 0.02wt%；
The preparation method of above-mentioned slim rich chromium cast iron pipe includes：
(1) steel scrap, ferrochrome, ferrosilicon and manganese are matched by standard of the weight percentage of above-mentioned C, Cr, Mn, Si, S, P
Iron；Vanadium iron is matched by standard of the weight percentage of V, Mo；Electricity is matched by standard of the weight percentage of Ni
Solve nickel；
Steel scrap, ferrochrome, ferrosilicon, ferromanganese and electrolytic nickel and being put into medium frequency induction melting furnace is smelted, treats it completely
Vanadium iron is added in after fusing, slag former slagging-off is added in after its fusing, obtains mixture I；
(2) it is blown into inert gas from melting furnace bottom to be stirred, while self-thermo furnace top is blown into the inertia for being mixed with oxygen
Gas, wherein, in the mixed gas that self-thermo furnace top is blown into, the volume ratio of inert gas and oxygen is 1：0.4.
(3) mixture I is warming up to 1570 DEG C, adds in aluminium powder and carry out deoxidation treatment as deoxidier；
(4) casting sand mold of the slim rich chromium cast iron pipe is manufactured using water-glass sand, water-glass sand molding sand intracavitary is painted with
Zircon powder alcohol group dope, the Zircon powder alcohol group dope include 82% zirconium English powder, 1.3% phenolic resin, 2.2% it is outstanding
Floating agent, 0.2% antifoaming agent, remaining is isopropanol, and the percentage composition is mass percent；
It is poured into a mould when molten iron temperature control is to 1620 DEG C；After the molten iron of cast 1/2, sprinkled on molten iron level anti-oxidation
The dosage of agent RLHY-31, the antioxidant RLHY-31 are the 0.3% of weight of molten iron, then proceed to pour molten iron；
When casting temperature is less than 250 DEG C of shake outs；
(5) annealing, quenching treatment：By the shove charge below 200 DEG C of pending workpiece, then it is warming up to the speed of 50 DEG C/h
500 DEG C, 1.2h is kept the temperature, is then warming up to 1050 DEG C to be no more than the temperature rise speed of 100 DEG C/h, keeps the temperature 1h, it is then that workpiece is fast
Speed, which is come out of the stove, carries out air quenching；
(6) temper：260 DEG C are warming up to the temperature rise speed of 40 DEG C/h, 1.3h is kept the temperature, then proceedes to be warming up to 460
DEG C, 2h is kept the temperature, is subsequently cooled to room temperature to get the slim rich chromium cast iron pipe.
Embodiment 3
A kind of slim rich chromium cast iron pipe includes the component of following weight percentage：C 2.5wt%, Cr 29wt%, Mn
1.1wt%, Mo 0.4wt%, V 1.1wt%, Ni 0.5wt%, Al 0.8wt%, Si≤1.0wt%, surplus Fe；
In the rich chromium cast iron pipe, the content of control P, S are less than 0.02wt%；
The preparation method of above-mentioned slim rich chromium cast iron pipe includes：
(1) steel scrap, ferrochrome, ferrosilicon and manganese are matched by standard of the weight percentage of above-mentioned C, Cr, Mn, Si, S, P
Iron；Vanadium iron is matched by standard of the weight percentage of V, Mo；Electricity is matched by standard of the weight percentage of Ni
Solve nickel；
Steel scrap, ferrochrome, ferrosilicon, ferromanganese and electrolytic nickel and being put into medium frequency induction melting furnace is smelted, treats it completely
Vanadium iron is added in after fusing, slag former slagging-off is added in after its fusing, obtains mixture I；
(2) it is blown into inert gas from melting furnace bottom to be stirred, while self-thermo furnace top is blown into the inertia for being mixed with oxygen
Gas, wherein, in the mixed gas that self-thermo furnace top is blown into, the volume ratio of inert gas and oxygen is 1：0.5.
(3) mixture I is warming up to 1570 DEG C, adds in aluminium powder and carry out deoxidation treatment as deoxidier；
(4) casting sand mold of the slim rich chromium cast iron pipe is manufactured using water-glass sand, water-glass sand molding sand intracavitary is painted with
Zircon powder alcohol group dope, the Zircon powder alcohol group dope include 84% zirconium English powder, 2.3% phenolic resin, 2.6% it is outstanding
Floating agent, 0.3% antifoaming agent, remaining is isopropanol, and the percentage composition is mass percent；
It is poured into a mould when molten iron temperature control is to 1640 DEG C；After the molten iron of cast 1/2, sprinkled on molten iron level anti-oxidation
The dosage of agent RLHY-31, the antioxidant RLHY-31 are the 0.6% of weight of molten iron, then proceed to pour molten iron；
When casting temperature is less than 250 DEG C of shake outs；
(5) annealing, quenching treatment：By the shove charge below 200 DEG C of pending workpiece, then it is warming up to the speed of 50 DEG C/h
500 DEG C, 1.4h is kept the temperature, is then warming up to 1050 DEG C to be no more than the temperature rise speed of 100 DEG C/h, keeps the temperature 2h, it is then that workpiece is fast
Speed, which is come out of the stove, carries out air quenching；
(6) temper：290 DEG C are warming up to the temperature rise speed of 40 DEG C/h, 1.4h is kept the temperature, then proceedes to be warming up to 490
DEG C, 2.5h is kept the temperature, is subsequently cooled to room temperature to get the slim rich chromium cast iron pipe.
Embodiment 4
A kind of slim rich chromium cast iron pipe includes the component of following weight percentage：C 1.5wt%, Cr 25wt%, Mn
0.8wt%, Mo 0.1wt%, V 0.4wt%, Ni 0.2wt%, Al 0.2wt%, Si≤1.0wt%, surplus Fe；
In the rich chromium cast iron pipe, the content of control P, S are less than 0.02wt%；
The preparation method of above-mentioned slim rich chromium cast iron pipe includes：
(1) steel scrap, ferrochrome, ferrosilicon and manganese are matched by standard of the weight percentage of above-mentioned C, Cr, Mn, Si, S, P
Iron；Vanadium iron is matched by standard of the weight percentage of V, Mo；Electricity is matched by standard of the weight percentage of Ni
Solve nickel；
Steel scrap, ferrochrome, ferrosilicon, ferromanganese and electrolytic nickel and being put into medium frequency induction melting furnace is smelted, treats it completely
Vanadium iron is added in after fusing, slag former slagging-off is added in after its fusing, obtains mixture I；
(2) it is blown into inert gas from melting furnace bottom to be stirred, while self-thermo furnace top is blown into the inertia for being mixed with oxygen
Gas, wherein, in the mixed gas that self-thermo furnace top is blown into, the volume ratio of inert gas and oxygen is 1：0.3.
(3) mixture I is warming up to 1560 DEG C, adds in aluminium powder and carry out deoxidation treatment as deoxidier；
(4) casting sand mold of the slim rich chromium cast iron pipe is manufactured using water-glass sand, water-glass sand molding sand intracavitary is painted with
Zircon powder alcohol group dope, the Zircon powder alcohol group dope include 80% zirconium English powder, 1% phenolic resin, 2% suspension
Agent, 0.1% antifoaming agent, remaining is isopropanol, and the percentage composition is mass percent；
It is poured into a mould when molten iron temperature control is to 1600~1650 DEG C；After the molten iron of cast 1/2, sprinkled on molten iron level
The dosage of antioxidant RLHY-31, the antioxidant RLHY-31 are the 0.2% of weight of molten iron, then proceed to pour iron
Water；
When casting temperature is less than 250 DEG C of shake outs；
(5) annealing, quenching treatment：By the shove charge below 200 DEG C of pending workpiece, then it is warming up to the speed of 50 DEG C/h
500 DEG C, 1h is kept the temperature, is then warming up to 1050 DEG C to be no more than the temperature rise speed of 100 DEG C/h, keeps the temperature 1h, it is then that workpiece is quick
It comes out of the stove and carries out air quenching；
(6) temper：250 DEG C are warming up to the temperature rise speed of 40 DEG C/h, 1.3h is kept the temperature, then proceedes to be warming up to 450
DEG C, 2h is kept the temperature, is subsequently cooled to room temperature to get the slim rich chromium cast iron pipe.
Embodiment 5
A kind of slim rich chromium cast iron pipe includes the component of following weight percentage：C 2.9wt%, Cr 30wt%, Mn
1.2wt%, Mo 0.5wt%, V 1.3wt%, Ni 0.6wt%, Al 1.0wt%, Si≤1.0wt%, surplus Fe；
In the rich chromium cast iron pipe, the content of control P, S are less than 0.02wt%；
The preparation method of above-mentioned slim rich chromium cast iron pipe includes：
(1) steel scrap, ferrochrome, ferrosilicon and manganese are matched by standard of the weight percentage of above-mentioned C, Cr, Mn, Si, S, P
Iron；Vanadium iron is matched by standard of the weight percentage of V, Mo；Electricity is matched by standard of the weight percentage of Ni
Solve nickel；
Steel scrap, ferrochrome, ferrosilicon, ferromanganese and electrolytic nickel and being put into medium frequency induction melting furnace is smelted, treats it completely
Vanadium iron is added in after fusing, slag former slagging-off is added in after its fusing, obtains mixture I；
(2) it is blown into inert gas from melting furnace bottom to be stirred, while self-thermo furnace top is blown into the inertia for being mixed with oxygen
Gas, wherein, in the mixed gas that self-thermo furnace top is blown into, the volume ratio of inert gas and oxygen is 1：0.6.
(3) mixture I is warming up to 1580 DEG C, adds in aluminium powder and carry out deoxidation treatment as deoxidier；
(4) casting sand mold of the slim rich chromium cast iron pipe is manufactured using water-glass sand, water-glass sand molding sand intracavitary is painted with
Zircon powder alcohol group dope, the Zircon powder alcohol group dope include 85% zirconium English powder, 2.5% phenolic resin, 2.8% it is outstanding
Floating agent, 0.4% antifoaming agent, remaining is isopropanol, and the percentage composition is mass percent；
It is poured into a mould when molten iron temperature control is to 1650 DEG C；After the molten iron of cast 1/2, sprinkled on molten iron level anti-oxidation
The dosage of agent RLHY-31, the antioxidant RLHY-31 are the 0.8% of weight of molten iron, then proceed to pour molten iron；
When casting temperature is less than 250 DEG C of shake outs；
(5) annealing, quenching treatment：By the shove charge below 200 DEG C of pending workpiece, then it is warming up to the speed of 50 DEG C/h
500 DEG C, 1.5h is kept the temperature, is then warming up to 1050 DEG C to be no more than the temperature rise speed of 100 DEG C/h, keeps the temperature 2h, it is then that workpiece is fast
Speed, which is come out of the stove, carries out air quenching；
(6) temper：300 DEG C are warming up to the temperature rise speed of 40 DEG C/h, 1.5h is kept the temperature, then proceedes to be warming up to 500
DEG C, 3h is kept the temperature, is subsequently cooled to room temperature to get the slim rich chromium cast iron pipe.
Slim rich chromium cast iron pipe is cast by the component and implementation of above-described embodiment, wall thickness 0.1mm carries out it
Correlated performance is tested and test result is recorded in table 1.
Basic principle, main feature and the features of the present invention of the present invention has been shown and described above.The technology of the industry
Personnel are it should be appreciated that the present invention is not limited to the above embodiments, and the above embodiments and description only describe this
The principle of invention, without departing from the spirit and scope of the present invention, various changes and improvements may be made to the invention, these changes
Change and improvement is both fallen in the range of claimed invention.The scope of protection of present invention is by appended claims
And its equivalent thereof.
Claims (4)
1. a kind of preparation method of slim rich chromium cast iron pipe, it is characterised in that：Include the following steps：
(1) steel scrap, ferrochrome, ferrosilicon, ferromanganese and electrolytic nickel are chosen and is put into medium frequency induction melting furnace and is smelted, treats it completely
Vanadium iron is added in after fusing, slag former slagging-off is added in after its fusing, obtains mixture I；
(2) it is blown into inert gas from melting furnace bottom to be stirred, while self-thermo furnace top is blown into the inert gas for being mixed with oxygen；
(3) mixture I is warming up to 1560~1580 DEG C, adds in aluminium powder and carry out deoxidation treatment as deoxidier；
(4) casting sand mold of the slim rich chromium cast iron pipe is manufactured using water-glass sand, when molten iron temperature control is to 1600~1650 DEG C
It is poured into a mould；When casting temperature is less than 250 DEG C of shake outs；
(5) annealing, quenching treatment：By the shove charge below 200 DEG C of pending workpiece, then 500 are warming up to the speed of 50 DEG C/h
DEG C, 1~1.5h is kept the temperature, is then warming up to 1050 DEG C to be no more than the temperature rise speed of 100 DEG C/h, 1~2h is kept the temperature, then by workpiece
Quick tapping carries out air quenching；
(6) temper：250~300 DEG C are warming up to the temperature rise speed of 40 DEG C/h, 1.3~1.5h is kept the temperature, then proceedes to heat up
To 450~500 DEG C, 2~3h is kept the temperature, is subsequently cooled to room temperature to get the slim rich chromium cast iron pipe.
2. the preparation method of slim rich chromium cast iron pipe according to claim 1, it is characterised in that：In step (2), self-thermo furnace
What top was blown into is mixed in the inert gas of oxygen, and the volume ratio of inert gas and oxygen is 1：(0.3~0.6).
3. the preparation method of slim rich chromium cast iron pipe according to claim 1, it is characterised in that：In step (4), waterglass
Zircon powder alcohol group dope is painted in sand mold sand chamber.
4. the preparation method of slim rich chromium cast iron pipe according to claim 1, it is characterised in that：In step (4), pouring into a mould
After 1/2 molten iron, sprinkle antioxidant on molten iron level, the dosage of the antioxidant for weight of molten iron 0.2~
0.8%, it then proceedes to pour molten iron.
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Application publication date: 20180706 |