CN105385802A - Casting technique for low-temperature high-tenacity nodular cast iron butterfly valve body - Google Patents
Casting technique for low-temperature high-tenacity nodular cast iron butterfly valve body Download PDFInfo
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- CN105385802A CN105385802A CN201510873728.XA CN201510873728A CN105385802A CN 105385802 A CN105385802 A CN 105385802A CN 201510873728 A CN201510873728 A CN 201510873728A CN 105385802 A CN105385802 A CN 105385802A
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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
- C21C1/00—Refining of pig-iron; Cast iron
- C21C1/10—Making spheroidal graphite cast-iron
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D1/00—Treatment of fused masses in the ladle or the supply runners before casting
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- 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
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Abstract
The invention relates to a casting technique for a low-temperature high-tenacity nodular cast iron butterfly valve body. The casting technique for the low-temperature high-tenacity nodular cast iron butterfly valve body comprises the first procedure of smelting, the second procedure of nodularization and inoculation, the third procedure of pouring and pulling out of a box, and the fourth procedure of heat treatment. The procedure of smelling comprises the first step of material preparation and the second step of smelling. According to the casting technique, strict material proportioning is conducted, material feeding for fusion is conducted in batches by two times, silicon carbide is added in the time interval between the two times of material feeding, and a traditional melting process is changed; a nodulizing agent is protected by combining a dam type nodulizing bag and a compacted nucleating agent, so that the nodulizing time and the nodulizing way are controlled; in addition, nodulization is conducted in batches, then mixing is conducted, and thus an ideal nodulizing effect is achieved; the chemical elements of a final product discharged out of a furnace are ideal, the metallography detection index is excellent, the mechanical property is excellent, and the requirement for operation of a valve in a low-temperature environment is completely met.
Description
Technical field
The invention belongs to Casting Technology field, be specifically related to a kind of casting technique of Low-temperature high-tenacity nodular cast iron butterfly type valve.
Background technology
The material of butterfly valve body is QT400-18L (GB1348-2009); Foreign standard: EN-GJS-400-18LT (DIN-EN1563-2012); Material requires: 1, tensile strength >=400MPa; 2, unit elongation >=18%; 3 ,-20 DEG C 3 sample mean ballistic work >=14J and single experimental value is not less than 12J (last type body sampling); 4, valve inner requires without casting flaws such as shrinkage porosites, and " X " X is no more than 3 grades.
Especially fluid (water, gas, oil) pipe-line transportation system field and chemical and medicine industry etc. field, coutroi velocity and the butterfly valve dammed is used in.Because the Working environment low temperature situation being applied to subzero less than 20 DEG C more.Therefore extremely harsh to the requirement of valve body.
But when factories many at present produces such foundry goods, technique is unstable, easily occurs that material is defective as tensile strength and low-temperature impact work is defective and inner easily occurs the defects such as shrinkage porosite, substandard requirement, cause waste product in batches.Do not reach the requirement of client, cause the losses such as claim.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind ofly makes that Low-temperature high-tenacity nodular cast iron butterfly type valve product performance are stablized, qualification rate is high, rate of reducing the number of rejects and seconds casting technique.
Technical scheme of the present invention:
A casting technique for Low-temperature high-tenacity nodular cast iron butterfly type valve, comprises the following steps:
One) melting operation
1, get the raw materials ready
Each material is taken: pig iron 12-22%, carbon steel 35-43%, foundry returns 41-49%, carburelant 1.0-2.0%, silicon carbide 0.1-0.3% and hot metal pretreatment agent 0.05-0.1% according to following mass percent proportioning;
2, melting
1) in electric furnace, drop into the pig iron, carburelant and carbon steel successively and carry out melting, the add-on of the described pig iron is step one) 1/3 of the pig iron full dose described in 1, the add-on of described carburelant is step one) full dose of the carburelant described in 1, the add-on of described carbon steel is step one) the carbon steel full dose described in 1 1/2.
2) after melting 1-2 minute by step one) the remaining pig iron, residue carbon steel, silicon carbide and foundry returns drop in electric furnace successively in 1;
3) be not less than 1360 DEG C, not higher than at the temperature of 1450 DEG C, heating and add step one after 5 minutes) the hot metal pretreatment agent described in 1, leave standstill 1-2 minute;
4) molten iron temperature is come out of the stove at 1520-1580 DEG C;
Two) nodularization and breed operation
1, dam formula nodularization bag is through molten iron preheating;
2, in side bottom described nodularization bag, drop into nodulizing agent, and cover the thick silicon barium calcium nucleating agent of 4-5mm, then cover the iron filings of spheroidal graphite pig-casting machine processing, then tamp, finally add a cover spheroidal graphite cast iron cover plate; Described nodulizing agent consumption is the 1.5-2.5% of molten iron total amount, and the silicon barium calcium nucleating agent that described 4-5mm is thick accounts for the 0.5-1.5% of molten iron total amount;
3, described step one) 4) molten iron pour the 60-65% of molten iron total amount in stove into from electric furnace to nodularization bag, pour opposite side bottom described nodularization bag into, after reaching the spheroidizing reacion time after pouring into, pour remaining molten iron in electric furnace into;
4, leave standstill 1-2 minute, cover poly-slag agent simultaneously and carry out pulling out slag;
5, ladle-to-ladlely to breed
5.1, casting ladle is through molten iron preheating;
5.2, bottom casting ladle, the silicon barium calcium nucleating agent of casting ladle splendid attire weight of molten iron 0.5-1% is thrown in, silicon barium calcium nucleating agent granularity 1-3mm;
5.3, in casting ladle, pour the molten iron after nodularization into, in hot metal ladle, when pouring half molten iron into, again add the silicon barium calcium nucleating agent accounting for weight of molten iron 0.2%, silicon barium calcium nucleating agent granularity 1-3mm;
5.4, leave standstill within 0.5-1 minute, pull out slag simultaneously;
Three) pour into a mould, pull out case operation
1, step 2 is used) molten iron temperature of 5.4 pours into a mould when 1380-1450 DEG C, controls the hardness Type B sclerometer of die cavity and be greater than 85;
2, with stream instant inoculation: watering in beam, adding sulphur, the oxygen nucleating agent of building weight of molten iron 0.1% with stream, sulphur, oxygen nucleating agent granularity 0.2-0.8mm;
3, the duration of pouring is controlled; Need terminate to be no more than 10 minutes in nodularization to be poured;
4, to be cast complete 4 hours after, after casting temperature is no more than 550 DEG C unpack pull out part;
5, remove dead head and form blank;
Four) heat treatment step
1, after blank being loaded heat treatment furnace, control temperature intensification per hour is not more than 90 DEG C, is warming up to 720-770 DEG C;
2,3 hours are incubated;
3, cold stoking cooling, is cooled to 550-600 DEG C and comes out of the stove, continue to be cooled to normal temperature after coming out of the stove.
Further, described step one) electric furnace is medium-frequency induction furnace in 2.
Further, described step 2) casting ladle is dam type pouring ladle in 5.1.
Further, described step one) 1 material of getting the raw materials ready need meet following standard-required:
The pig iron: adopt high-quality spheroidal graphite cast iron pig iron Q10:
Chemical composition: one-level one class one group:
C＞3.4％、Si0.5-1％、Mn＜0.1％、S≤0.02％、P≤0.03％、Ti≤0.03％，
Impurity element Cr, V, Pb, Bi, As, B, Al, Mo, Sn sum≤0.085%
Surface quality: clean surface, without slag, without sand material, non-corroding, lumpiness is even;
Carbon steel: non-corroding, inclusion-free, minimum thickness is not less than 5mm;
Foundry returns: the foundry returns using 400-18, foundry returns needs to carry out Shot Blasting;
Carburelant: adopt the special carburelant of spheroidal graphite cast iron namely through the carburelant of high temperature drying graphitization processing;
Fixed carbon >=98%, sulphur content≤0.05%, ash content≤0.5%, fugitive constituent≤0.5%, moisture≤0.5%, N≤400Ppm, granularity 1-5mm;
Silicon carbide: carborundum content 90%, silicon content 60-63%, carbon content 25-28%, granularity 0.2-10mm;
Hot metal pretreatment agent: siliceous 65%;
Described step 2) in nucleating agent and nodulizing agent and described step 3) in sulphur, oxygen breed and meet following standard-required:
Nodulizing agent: adopt QRMg6Re2 nodulizing agent;
Mg5-7％、Re1.5-2.5％、Si42-44％、Ca2-3％、Al≤0.5％、Ti≤0.05％，
Content of magnesia≤1%;
Lumpiness: 5-25mm;
Nucleating agent: adopt silicon barium calcium and sulphur, oxygen nucleating agent;
Barinoc silicon barium calcium nucleating agent Si72-77%, Bi2-3%, Ca1-2%, Al0.8-1.5%, granularity 1-3mm;
Sulphur, oxygen nucleating agent granularity 0.2-0.8mm.
Further, the spheroidizing reacion time calculated according to 2-3 per ton minute, determined according to furnace volume.
Further, described step one) 3 add after hot metal pretreatment agent and leave standstill 2 minutes.
Further, described step 2) molten iron of pouring nodularization bag in 3 into is 63% of molten iron total amount.
Further, described step 2) 2 nodularization temperature be 1515-1525 DEG C.
The present invention compared with prior art has following beneficial effect: this technique is by the strict proportioning of raw material; the melting timesharing that feeds intake operates in batches; silicon carbide is added between feeding intake at twice; change traditional melting process; formula nodularization inclusion in dam is utilized to close the nucleating agent protection nodulizing agent of compacting; to control time and the mode of nodularization; and be nodularization remix in batches; reach desirable nodularization effect; after the stove of the finished product, chemical composition is desirable; metallographic Testing index is excellent, and mechanical property is had outstanding performance, and meets the operating requirement of valve low temperature environment completely.
Embodiment
Illustrate for the electric furnace of 2000kg.
Embodiment 1
A casting technique for Low-temperature high-tenacity nodular cast iron butterfly type valve, comprises the following steps:
One) melting operation
1, get the raw materials ready
Each material is taken: pig iron 400kg, carbon steel 775kg, foundry returns 785kg, carburelant 33kg, silicon carbide 5kg and hot metal pretreatment agent 2kg according to following mass percent proportioning;
Its Raw is chosen:
The pig iron: adopt high-quality spheroidal graphite cast iron pig iron Q10:
Chemical composition: one-level one class one group:
C＞3.4％、Si0.5-1％、Mn＜0.1％、S≤0.02％、P≤0.03％、Ti≤0.03％，
Impurity element Cr, V, Pb, Bi, As, B, Al, Mo, Sn sum≤0.085%
Surface quality: clean surface, without slag, without sand material, non-corroding, lumpiness is even;
Carbon steel: non-corroding, inclusion-free, minimum thickness is not less than 5mm;
Foundry returns: the foundry returns using 400-18, foundry returns needs to carry out Shot Blasting;
Carburelant: adopt the special carburelant of spheroidal graphite cast iron namely through the carburelant of high temperature drying graphitization processing;
Fixed carbon >=98%, sulphur content≤0.05%, ash content≤0.5%, fugitive constituent≤0.5%, moisture≤0.5%, N≤400Ppm, granularity 1-5mm;
Silicon carbide: carborundum content 90%, silicon content 60-63%, carbon content 25-28%, granularity 0.2-10mm;
Hot metal pretreatment agent: siliceous 65%;
2, melting
1) in medium-frequency induction furnace, drop into the pig iron, carburelant and carbon steel successively and carry out melting, the add-on of the described pig iron is step one) 1/3 of the pig iron full dose described in 1, the add-on of described carburelant is step one) full dose of the carburelant described in 1, the add-on of described carbon steel is step one) the carbon steel full dose described in 1 1/2;
2) after melting 2 minutes by step one) the remaining pig iron, residue carbon steel, silicon carbide and foundry returns drop in electric furnace successively in 1;
3) step one is added 1390 DEG C of heating after 5 minutes) the hot metal pretreatment agent described in 1, leave standstill 1 minute;
4) molten iron temperature is come out of the stove at 1550 DEG C;
Two) nodularization and breed operation
1, dam formula nodularization bag is through molten iron preheating;
2, in side bottom described nodularization bag, drop into nodulizing agent, and cover the thick silicon barium calcium nucleating agent of 4mm, then cover the iron filings of spheroidal graphite pig-casting machine processing, then tamp, finally add a cover spheroidal graphite cast iron cover plate; The silicon barium calcium nucleating agent 20kg that described nodulizing agent 39kg, described 4mm are thick;
3, molten iron temperature is 1520 DEG C time, described step one) 2,4) molten iron pour 63% of molten iron total amount in stove into from electric furnace to nodularization bag, pour opposite side bottom described nodularization bag into, after reaching the spheroidizing reacion time after pouring into, pour remaining molten iron in electric furnace into;
4, leave standstill 2 minutes, cover poly-slag agent simultaneously and carry out pulling out slag;
5, ladle-to-ladlely to breed
5.1, the dam type pouring ladle of 500kg is through molten iron preheating;
5.2, bottom casting ladle, the silicon barium calcium nucleating agent of 4kg is thrown in, silicon barium calcium nucleating agent granularity 1-3mm;
5.3, in casting ladle, pour the molten iron after nodularization into, in hot metal ladle, when pouring half molten iron into, again add the silicon barium calcium nucleating agent accounting for weight of molten iron 1kg, silicon barium calcium nucleating agent granularity 1-3mm;
5.4, leave standstill within 1 minute, pull out slag simultaneously;
Nodulizing agent: adopt QRMg6Re2 nodulizing agent;
Mg5-7％、Re1.5-2.5％、Si42-44％、Ca2-3％、Al≤0.5％、Ti≤0.05％，
Content of magnesia≤1%;
Lumpiness: 5-25mm;
Nucleating agent: Barinoc silicon barium calcium nucleating agent Si72-77%, Bi2-3%, Ca1-2%, Al0.8-1.5%, granularity 1-3mm;
Three) pour into a mould, pull out case operation
1, step 2 is used) molten iron temperature of 5.4 pours into a mould, controls the hardness Type B sclerometer of die cavity and be greater than 85 1420 DEG C time;
2, with stream instant inoculation: watering in beam, adding sulphur, the oxygen nucleating agent of building weight of molten iron 0.1% with stream, sulphur, oxygen nucleating agent granularity 0.2-0.8mm; Adding the iron water amount of building molten iron with stream is determine according to the size of model casting;
3, the duration of pouring is controlled: need terminate to be poured for 9 minutes in nodularization;
4, to be cast complete 4.5 hours after, casting temperature 540 DEG C unpack pulls out part;
5, remove dead head and form blank;
Four) heat treatment step
1, after blank being loaded heat treatment furnace, control temperature intensification per hour 90 DEG C, is warming up to 770 DEG C;
2,3 hours are incubated;
3, cold stoking cooling, is cooled to 600 DEG C and comes out of the stove, continue to be cooled to normal temperature after coming out of the stove.
Embodiment 2
Difference from Example 1 is:
In step one) 1, take each material according to weight when getting the raw materials ready: pig iron 380kg, carbon steel 787kg, foundry returns 797kg, carburelant 20kg, silicon carbide 4kg and hot metal pretreatment agent 2kg;
In step 2) 3, molten iron temperature is 1520 DEG C time, described step one) 2,4) molten iron pour 60% of molten iron total amount in stove into from electric furnace to nodularization bag, pour opposite side bottom described nodularization bag into, after reaching the spheroidizing reacion time after pouring into, pour remaining molten iron in electric furnace into;
Four) 1, blank is loaded heat treatment furnace after, control temperature intensification per hour 85 DEG C, is warming up to 755 DEG C.
Embodiment 3 difference from Example 1 is:
A casting technique for Low-temperature high-tenacity nodular cast iron butterfly type valve, comprises the following steps:
One) melting operation
1, get the raw materials ready
Each material is taken: pig iron 380kg, carbon steel 787kg, foundry returns 797kg, carburelant 20kg, silicon carbide 4kg and hot metal pretreatment agent 2kg according to following mass percent proportioning;
2, melting
1) in medium-frequency induction furnace, drop into the pig iron, carburelant and carbon steel successively and carry out melting, the add-on of the described pig iron is step one) 1/3 of the pig iron full dose described in 1, the add-on of described carburelant is step one) full dose of the carburelant described in 1, the add-on of described carbon steel is step one) the carbon steel full dose described in 1 1/2;
2) after melting 2 minutes by step one) the remaining pig iron, residue carbon steel, silicon carbide, foundry returns drop in electric furnace successively in 1;
3) at 1420 DEG C, heat and add step one after 5 minutes) the hot metal pretreatment agent described in 1, leave standstill 1 minute;
4) molten iron temperature is come out of the stove at 1570 DEG C;
Two) nodularization and breed operation
1, dam formula nodularization bag is through molten iron preheating;
2, in side bottom described nodularization bag, drop into nodulizing agent, and cover the thick silicon barium calcium nucleating agent of 4.5mm, then cover the iron filings of spheroidal graphite pig-casting machine processing, then tamp, finally add a cover spheroidal graphite cast iron cover plate; The silicon barium calcium nucleating agent 15kg that described nodulizing agent 42kg, described 4.5mm are thick;
3, molten iron temperature is 1515 DEG C time, described step one) 2,4) molten iron pour 65% of molten iron total amount in stove into from electric furnace to nodularization bag, pour opposite side bottom described nodularization bag into, after reaching the spheroidizing reacion time after pouring into, pour remaining molten iron in electric furnace into;
4, leave standstill 1.5 minutes, cover poly-slag agent simultaneously and carry out pulling out slag;
5, ladle-to-ladlely to breed
Three) pour into a mould, pull out case operation
1, step 2 is used) molten iron temperature of 5.4 pours into a mould, controls the hardness Type B sclerometer of die cavity and be greater than 85 1400 DEG C time;
2, with stream instant inoculation;
3, the duration of pouring is controlled: need terminate to be poured for 8 minutes in nodularization;
4, to be cast complete 4 hours after, casting temperature 400 DEG C unpack pulls out part;
5, remove dead head and form blank;
Four) heat treatment step
1, after blank being loaded heat treatment furnace, control temperature intensification per hour is not more than 75 DEG C, is warming up to 720 DEG C;
2,3 hours are incubated;
3, cold stoking cooling, is cooled to 580 DEG C and comes out of the stove, continue to be cooled to normal temperature after coming out of the stove.
The blank of above embodiment technical scheme samples respectively and detects, and metallographic examination sampling requirement is sampled as last type test lug or test lug of cast; Last type foundry goods body sampling of mechanical property sampling requirement.
Finished product is through inspection:
Chemical composition after stove: C3.5-3.7%Si1.9-2.1%Mn≤0.19%S≤0.015%P≤0.035%Mg (residual) 0.036-0.048%Re (residual) 0.012-0.025%Ni0.15-0.3%Sb0.003%-0.005%Cu≤0.1%Cr≤0.02Mo≤0.01%Bi≤0.015%Ti≤0.03%Pb≤0.02%Al≤0.005%V≤0.02%
Metallographic examination: Oxygen potential >=85% (more than 90% is I level graphite) matrix ferrite F >=90% cementite≤1%; Without iron phosphide eutectic.
Mechanical property: adopt the test block of 25mm " Y " type, need casting two groups, one group is as cast condition inspection, and one group is
Check after thermal treatment.
Tensile strength sigma b >=415Mpa
Yield strength σ 0.2 >=250MPa;
Unit elongation 6 >=18%;
Normal temperature ballistic work >=13J;
More than body hardness 140HB.
Hot metal pretreatment agent, multiple nucleating agent and nodulizing agent are all that casting industry routine is selected.
Molten iron preheating refers to pour in casting ladle and nodularization bag with the molten iron of melting carries out short stay, repeatedly carry out adding after pouring out, the inner wall temperature of casting ladle and nodularization bag is made to rise to molten iron temperature, such operation is the routine operation of casting field, also flame heat temperature raising can be used, can according to demand and environmental selection.
Claims (8)
1. a casting technique for Low-temperature high-tenacity nodular cast iron butterfly type valve, is characterized in that: comprise the following steps:
One) melting operation
1, get the raw materials ready
Each material is taken: pig iron 12-22%, carbon steel 35-43%, foundry returns 41-49%, carburelant 1.0-2.0%, silicon carbide 0.1-0.3% and hot metal pretreatment agent 0.05-0.1% according to following mass percent proportioning;
2, melting
1) in electric furnace, drop into the pig iron, carburelant and carbon steel successively and carry out melting, the add-on of the described pig iron is step one) 1/3 of the pig iron full dose described in 1, the add-on of described carburelant is step one) full dose of the carburelant described in 1, the add-on of described carbon steel is step one) the carbon steel full dose described in 1 1/2;
2) after melting 1-2 minute by step one) the remaining pig iron, residue carbon steel, silicon carbide and foundry returns drop in electric furnace successively in 1;
3) be not less than 1360 DEG C, not higher than at the temperature of 1450 DEG C, heating and add step one after 5 minutes) the hot metal pretreatment agent described in 1, leave standstill 1-2 minute;
4) molten iron temperature is come out of the stove at 1520-1580 DEG C;
Two) nodularization and breed operation
1, dam formula nodularization bag is through molten iron preheating;
2, in side bottom described nodularization bag, drop into nodulizing agent, and cover the thick silicon barium calcium nucleating agent of 4-5mm, then cover the iron filings of spheroidal graphite pig-casting machine processing, then tamp, finally add a cover spheroidal graphite cast iron cover plate; Described nodulizing agent consumption is the 1.5-2.5% of molten iron total amount, and the silicon barium calcium nucleating agent that described 4-5mm is thick accounts for the 0.5-1.5% of molten iron total amount;
3, described step one) 4) molten iron pour the 60-65% of molten iron total amount in stove into from electric furnace to nodularization bag, pour opposite side bottom described nodularization bag into, after reaching the spheroidizing reacion time after pouring into, pour remaining molten iron in electric furnace into;
4, leave standstill 1-2 minute, cover poly-slag agent simultaneously and carry out pulling out slag;
5, ladle-to-ladlely to breed
5.1, casting ladle is through molten iron preheating;
5.2, bottom casting ladle, the silicon barium calcium nucleating agent of casting ladle splendid attire weight of molten iron 0.5-1% is thrown in, silicon barium calcium nucleating agent granularity 1-3mm;
5.3, in casting ladle, pour the molten iron after nodularization into, in hot metal ladle, when pouring half molten iron into, again add the silicon barium calcium nucleating agent accounting for weight of molten iron 0.2%, silicon barium calcium nucleating agent granularity 1-3mm;
5.4, leave standstill within 0.5-1 minute, pull out slag simultaneously;
Three) pour into a mould, pull out case operation
1, step 2 is used) molten iron temperature of 5.4 pours into a mould when 1380-1450 DEG C, controls the hardness Type B sclerometer of die cavity and be greater than 85;
2, with stream instant inoculation: watering in beam, adding sulphur, the oxygen nucleating agent of building weight of molten iron 0.1% with stream, sulphur, oxygen nucleating agent granularity 0.2-0.8mm;
3, the duration of pouring is controlled: need terminate to be no more than 10 minutes in nodularization and be poured;
4, to be cast complete 4 hours after, after casting temperature is no more than 550 DEG C unpack pull out part;
5, remove dead head and form blank;
Four) heat treatment step
1, after blank being loaded heat treatment furnace, control temperature intensification per hour is not more than 90 DEG C, is warming up to 720-770 DEG C;
2,3 hours are incubated;
3, cold stoking cooling, is cooled to 550-600 DEG C and comes out of the stove, continue to be cooled to normal temperature after coming out of the stove.
2. the casting technique of Low-temperature high-tenacity nodular cast iron butterfly type valve according to claim 1, is characterized in that: described step one) electric furnace is medium-frequency induction furnace in 2.
3. the casting technique of Low-temperature high-tenacity nodular cast iron butterfly type valve according to claim 1, is characterized in that: described step 2) casting ladle is dam type pouring ladle in 5.1.
4. the casting technique of Low-temperature high-tenacity nodular cast iron butterfly type valve according to claim 1, is characterized in that: described step one) 1 material of getting the raw materials ready need meet following standard-required:
The pig iron: adopt high-quality spheroidal graphite cast iron pig iron Q10:
Chemical composition: one-level one class one group:
C＞3.4％、Si0.5-1％、Mn＜0.1％、S≤0.02％、P≤0.03％、Ti≤0.03％，
Impurity element Cr, V, Pb, Bi, As, B, Al, Mo, Sn sum≤0.085%
Surface quality: clean surface, without slag, without sand material, non-corroding, lumpiness is even;
Carbon steel: non-corroding, inclusion-free, minimum thickness is not less than 5mm;
Foundry returns: the foundry returns using 400-18, foundry returns needs to carry out Shot Blasting;
Carburelant: adopt the special carburelant of spheroidal graphite cast iron namely through the carburelant of high temperature drying graphitization processing;
Fixed carbon >=98%, sulphur content≤0.05%, ash content≤0.5%, fugitive constituent≤0.5%, moisture≤0.5%, N≤400Ppm, granularity 1-5mm;
Silicon carbide: carborundum content 90%, silicon content 60-63%, carbon content 25-28%, granularity 0.2-10mm;
Hot metal pretreatment agent: siliceous 65%;
Described step 2) in nucleating agent and nodulizing agent and described step 3) in sulphur, oxygen breed and meet following standard-required:
Nodulizing agent: adopt QRMg6Re2 nodulizing agent;
Mg5-7%, Re1.5-2.5%, Si42-44%, Ca2-3%, Al≤0.5%, Ti≤0.05%, content of magnesia≤1%;
Lumpiness: 5-25mm;
Nucleating agent: adopt silicon barium calcium and sulphur, oxygen nucleating agent;
Barinoc silicon barium calcium nucleating agent Si72-77%, Bi2-3%, Ca1-2%, Al0.8-1.5%, granularity 1-3mm;
Sulphur, oxygen nucleating agent granularity 0.2-0.8mm.
5. the casting technique of Low-temperature high-tenacity nodular cast iron butterfly type valve according to claim 1, is characterized in that: the spheroidizing reacion time calculated according to 2-3 per ton minute, determined according to furnace volume.
6. the casting technique of the Low-temperature high-tenacity nodular cast iron butterfly type valve according to any one of claim 1-5, is characterized in that: described step one) 3 add after hot metal pretreatment agent and leave standstill 2 minutes.
7. the casting technique of Low-temperature high-tenacity nodular cast iron butterfly type valve according to claim 6, is characterized in that: described step 2) molten iron of pouring nodularization bag in 3 into is 63% of molten iron total amount.
8. the casting technique of Low-temperature high-tenacity nodular cast iron butterfly type valve according to claim 7, is characterized in that: described step 2) the nodularization temperature of 2 is 1515-1525 DEG C.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510873728.XA CN105385802B (en) | 2015-12-03 | 2015-12-03 | The casting technique of Low-temperature high-tenacity nodular cast iron butterfly type valve |
Applications Claiming Priority (1)
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| CN105689647A (en) * | 2016-03-16 | 2016-06-22 | 繁昌县华彩铸造有限公司 | Casting process for outlet water valve |
| CN106435342A (en) * | 2016-08-31 | 2017-02-22 | 常州宏賸科技股份有限公司 | Casting technology of low-temperature and high-tenacity spheroidal graphite cast iron butterfly valve containing carbides |
| CN106834893A (en) * | 2017-02-25 | 2017-06-13 | 喀左金牛铸造有限公司 | A kind of production technology of cast high-strength high-toughness spheroidal graphite cast-iron |
| CN108202131A (en) * | 2016-12-16 | 2018-06-26 | 江苏泽茗精密机械制造股份有限公司 | The casting technique of turbocharger housing |
| CN108531803A (en) * | 2018-05-18 | 2018-09-14 | 中信重工机械股份有限公司 | A kind of casting method of spheroidal graphite cast-iron valve body |
| CN108687308A (en) * | 2018-08-08 | 2018-10-23 | 溧阳市新力机械铸造有限公司 | A kind of casting method of gearbox casting device and gearbox |
| CN109338026A (en) * | 2018-11-15 | 2019-02-15 | 四川海科机械制造有限公司 | The manufacturing process of high temperature spheroidal graphite cast-iron |
| CN109852758A (en) * | 2019-03-25 | 2019-06-07 | 河南旭锐合金新材料制造有限公司 | A kind of forming method of spheroidal graphite cast-iron |
| CN111451444A (en) * | 2020-05-21 | 2020-07-28 | 宜宾普什联动科技有限公司 | Casting method of high-horsepower engine box body casting |
| CN111926238A (en) * | 2020-07-13 | 2020-11-13 | 河北裕龙科技股份有限公司 | Production process of high-strength high-toughness high-speed rail brake pad |
| CN112553395A (en) * | 2020-12-09 | 2021-03-26 | 大连瑞谷科技有限公司 | Spheroidizing process for nodular cast iron for production of retainer |
| CN113416900A (en) * | 2021-06-28 | 2021-09-21 | 南京晓庄学院 | Alloy-enhanced high-carbon-based carbon steel casting material and casting method thereof |
| CN115213360A (en) * | 2022-05-17 | 2022-10-21 | 宁波日星铸业有限公司 | Preparation method of nodular cast iron for wind driven generator hub |
| CN115533040A (en) * | 2022-10-13 | 2022-12-30 | 安徽博煊铸造有限公司 | Casting method of high-density high-pressure-resistant nodular valve body |
| CN115533040B (en) * | 2022-10-13 | 2024-05-31 | 安徽博煊铸造有限公司 | Casting method of high-density high-pressure-resistant spherical ink valve body |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105689647A (en) * | 2016-03-16 | 2016-06-22 | 繁昌县华彩铸造有限公司 | Casting process for outlet water valve |
| CN106435342A (en) * | 2016-08-31 | 2017-02-22 | 常州宏賸科技股份有限公司 | Casting technology of low-temperature and high-tenacity spheroidal graphite cast iron butterfly valve containing carbides |
| CN108202131A (en) * | 2016-12-16 | 2018-06-26 | 江苏泽茗精密机械制造股份有限公司 | The casting technique of turbocharger housing |
| CN106834893A (en) * | 2017-02-25 | 2017-06-13 | 喀左金牛铸造有限公司 | A kind of production technology of cast high-strength high-toughness spheroidal graphite cast-iron |
| CN106834893B (en) * | 2017-02-25 | 2018-05-08 | 喀左金牛铸造有限公司 | A kind of production technology of cast high-strength high-toughness spheroidal graphite cast-iron |
| CN108531803A (en) * | 2018-05-18 | 2018-09-14 | 中信重工机械股份有限公司 | A kind of casting method of spheroidal graphite cast-iron valve body |
| CN108531803B (en) * | 2018-05-18 | 2019-11-22 | 中信重工机械股份有限公司 | A kind of casting method of spheroidal graphite cast-iron valve body |
| CN108687308A (en) * | 2018-08-08 | 2018-10-23 | 溧阳市新力机械铸造有限公司 | A kind of casting method of gearbox casting device and gearbox |
| CN109338026A (en) * | 2018-11-15 | 2019-02-15 | 四川海科机械制造有限公司 | The manufacturing process of high temperature spheroidal graphite cast-iron |
| CN109852758A (en) * | 2019-03-25 | 2019-06-07 | 河南旭锐合金新材料制造有限公司 | A kind of forming method of spheroidal graphite cast-iron |
| CN111451444A (en) * | 2020-05-21 | 2020-07-28 | 宜宾普什联动科技有限公司 | Casting method of high-horsepower engine box body casting |
| CN111926238A (en) * | 2020-07-13 | 2020-11-13 | 河北裕龙科技股份有限公司 | Production process of high-strength high-toughness high-speed rail brake pad |
| CN111926238B (en) * | 2020-07-13 | 2022-02-15 | 河北裕龙科技股份有限公司 | Production process of high-strength high-toughness high-speed rail brake pad |
| CN112553395A (en) * | 2020-12-09 | 2021-03-26 | 大连瑞谷科技有限公司 | Spheroidizing process for nodular cast iron for production of retainer |
| CN112553395B (en) * | 2020-12-09 | 2022-06-24 | 大连瑞谷科技有限公司 | Spheroidizing process for nodular cast iron for production of retainer |
| CN113416900A (en) * | 2021-06-28 | 2021-09-21 | 南京晓庄学院 | Alloy-enhanced high-carbon-based carbon steel casting material and casting method thereof |
| CN115213360A (en) * | 2022-05-17 | 2022-10-21 | 宁波日星铸业有限公司 | Preparation method of nodular cast iron for wind driven generator hub |
| CN115213360B (en) * | 2022-05-17 | 2024-04-09 | 宁波日星铸业有限公司 | Preparation method of spheroidal graphite cast iron for hub of wind driven generator |
| CN115533040A (en) * | 2022-10-13 | 2022-12-30 | 安徽博煊铸造有限公司 | Casting method of high-density high-pressure-resistant nodular valve body |
| CN115533040B (en) * | 2022-10-13 | 2024-05-31 | 安徽博煊铸造有限公司 | Casting method of high-density high-pressure-resistant spherical ink valve body |
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