CN105385802B - The casting technique of Low-temperature high-tenacity nodular cast iron butterfly type valve - Google Patents
The casting technique of Low-temperature high-tenacity nodular cast iron butterfly type valve Download PDFInfo
- Publication number
- CN105385802B CN105385802B CN201510873728.XA CN201510873728A CN105385802B CN 105385802 B CN105385802 B CN 105385802B CN 201510873728 A CN201510873728 A CN 201510873728A CN 105385802 B CN105385802 B CN 105385802B
- Authority
- CN
- China
- Prior art keywords
- iron
- molten iron
- nodularization
- inovulant
- temperature
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- 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
-
- 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
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
The present invention relates to a kind of casting technique of Low-temperature high-tenacity nodular cast iron butterfly type valve, comprise the following steps：One) melting process：1st, get the raw materials ready；2nd, melting；Two) nodularization and process is bred；Three) pour into a mould, pull out case process；Four) heat treatment step；The strict proportioning that this technique passes through raw material; the melting timesharing that feeds intake is operated in batches, and carborundum is added between feeding intake twice, changes traditional melting process; the inovulant for closing compacting using dam formula nodularization inclusion protects nodulizer; to control time and the mode of nodularization, and it is that nodularization is remixed in batches, reaches preferable nodularization effect; chemical composition is preferable after the stove of final products; metallographic Testing index is excellent, and mechanical property is had outstanding performance, and fully meets the service requirement of valve low temperature environment.
Description
Technical field
The invention belongs to Casting Technology field, and in particular to a kind of casting of Low-temperature high-tenacity nodular cast iron butterfly type valve
Technique.
Background technology
The material of butterfly valve body is QT400-18L (GB1348-2009)；Foreign standard：EN-GJS-400-18LT
(DINEN1563-2012)；Material requirement：1st, tensile strength >=400MPa；2nd, elongation percentage >=18%；3rd, -20 DEG C of 3 samples are put down
Equal ballistic work >=14J and single experiment value is not less than 12J (last type body sampling)；4th, valve inner requirement is cast without shrinkage porosite etc.
Defect is made, " X " optical check is no more than 3 grades.
Be specifically employed in fluid (water, gas, oil) field such as pipe-line transportation system field and chemical and medicine industry, coutroi velocity and
The butterfly valve dammed.Because the more low temperature situations for being applied to subzero less than 20 DEG C of working environment.Therefore the requirement to valve body is extremely
It is harsh.
But when the factory of many produces such casting at present, technique is unstable, easily there is material unqualified as anti-
Tensile strength and low-temperature impact work it is unqualified and it is internal easily there are the defects such as shrinkage porosite, substandard requirement causes batch useless
Product.Do not reach the requirement of client, cause the loss such as claim.
The content of the invention
The technical problems to be solved by the invention, which are to provide one kind, makes Low-temperature high-tenacity nodular cast iron butterfly type valve properties of product
Stable, qualification rate is high, the casting technique for rate of reducing the number of rejects and seconds.
Technical scheme：
A kind of casting technique of Low-temperature high-tenacity nodular cast iron butterfly type valve, comprises the following steps：
One) melting process
1st, get the raw materials ready
Each material is weighed according to following mass percent proportioning：Pig iron 12-22%, carbon steel 35-43%, foundry returns 41-
49%th, carburant 1.0-2.0%, carborundum 0.1-0.3% and molten iron pretreating agent 0.05-0.1%；
2nd, melting
1) put into the pig iron, carburant and carbon steel successively into electric furnace to be melted, the addition of the pig iron is step
One) pig iron full dose described in 1 1/3, the addition of the carburant be step one) full dose of carburant described in 1, institute
The addition for stating carbon steel is step one) 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, carborundum and foundry returns are thrown successively in 1
Enter in electric furnace；
3) it is being not less than 1360 DEG C, is being not above at a temperature of 1450 DEG C, heating adds step one after 5 minutes) described in 1
Molten iron pretreating agent, stand 1-2 minutes；
4) molten iron temperature is come out of the stove at 1520-1580 DEG C；
Two) nodularization and process is bred
1st, dam formula nodularization bag is preheated through molten iron；
2nd, nodulizer is put into the nodularization bag bottom side, and covers the thick silicon barium calcium inovulants of 4-5mm, is then covered
The mach iron filings of lid spheroidal graphite cast-iron, then tamp, and are finally capped spheroidal graphite cast-iron cover plate；The nodulizer consumption is molten iron total amount
1.5-2.5%, silicon barium calcium the inovulant thick 4-5mm accounts for the 0.5-1.5% of molten iron total amount；
3rd, the step one) molten iron 4) pours into the 60-65% of molten iron total amount in stove from electric furnace to nodularization bag, pours into described
Nodularization bag bottom opposite side, pours into after finishing and reaches remaining molten iron in electric furnace is poured into after the spheroidizing reacion time；
4th, 1-2 minutes are stood, is skimmed while covering Slag conglomeration agent；
5th, it is ladle-to-ladle to breed
5.1st, casting ladle is preheated through molten iron；
5.2nd, the silicon barium calcium inovulant that casting ladle contains weight of molten iron 0.5-1%, silicon barium calcium inovulant are delivered to casting ladle bottom
Granularity 1-3mm；
5.3rd, the molten iron poured into casting ladle after nodularization, adds and accounts for molten iron weight again when pouring into half molten iron into ladle
The silicon barium calcium inovulant of amount 0.2%, silicon barium calcium inovulant granularity 1-3mm；
5.4th, stand and skim simultaneously for 0.5-1 minutes；
Three) pour into a mould, pull out case process
1st, using step 2) 5.4 molten iron temperature poured into a mould at 1380-1450 DEG C, controls the hardness Type B of die cavity hard
Degree meter is more than 85；
2nd, with stream instant inoculation：In beam is poured, the casting sulphur of weight of molten iron 0.1%, oxygen inovulant are added with stream, sulphur,
Oxygen inovulant granularity 0.2-0.8mm；
3rd, the duration of pouring is controlled；It need to terminate to be poured no more than 10 minutes in nodularization；
4th, it is to be cast complete 4 hours after, casting temperature be no more than 550 DEG C after unpack pulls out part；
5th, dead head formation blank is removed；
Four) heat treatment step
1st, blank is loaded after heat-treatment furnace, control temperature heats up no more than 90 DEG C per hour, is warming up to 720-770 DEG C；
2nd, 3 hours are incubated；
3rd, cold stoking is cooled down, and is cooled to 550-600 DEG C and is come out of the stove, normal temperature is continued cool to after coming out of the stove.
Further, the step one) electric furnace is medium-frequency induction furnace in 2.
Further, the step 2) casting ladle is dam type pouring ladle in 5.1.
Further, the step one) 1 material got the raw materials ready need to meet the requirement of following standard：
The pig iron：Using high-quality spheroidal graphite cast iron pig iron Q10：
Chemical composition：One group of one class of one-level：
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, no slag, without sand material, non-corroding, lumpiness is uniform；
Carbon steel：Non-corroding, free from admixture, minimum thickness are not less than 5mm,；
Foundry returns：Using 400-18 foundry returns, foundry returns needs to carry out Shot Blasting；
Carburant：It is the carburant Jing Guo high temperature drying graphitization processing using the special carburant of spheroidal graphite cast-iron；
Fixed carbon >=98%, sulphur content≤0.05%, ash content≤0.5%, fugitive constituent≤0.5%, moisture≤0.5%, N≤
400ppm, granularity 1-5mm；
Carborundum：Carborundum content 90%, silicon content 60-63%, phosphorus content 25-28%, granularity 0.2-10mm；
Molten iron pretreating agent：Siliceous 65%；
The step 2) in inovulant and nodulizer and the step 3) in sulphur, oxygen breeds and meets following standard
It is required that：
Nodulizer：Using QR Mg6Re2 nodulizers；
Mg5-7%, Re1.5-2.5%, Si42-44%, Ca2-3%, Al≤0.5%, Ti≤0.05%,
Content of magnesia≤1%；
Lumpiness：5-25mm；
Inovulant：Using silicon barium calcium and sulphur, oxygen inovulant；
Barinoc silicon barium calcium inovulant Si72-77%, Bi2-3%, Ca1-2%, Al0.8-1.5%, granularity 1-3mm；
Sulphur, oxygen inovulant granularity 0.2-0.8mm.
Further, the spheroidizing reacion time, according to 2-3 minutes per ton calculating, determines according to furnace volume.
Further, the step one) 2,3) add molten iron pretreating agent after stand 2 minutes.
Further, the step 2) molten iron that pours into nodularization bag in 3 is the 63% of molten iron total amount.
Further, the step 2) 2 nodularization temperature is 1515-1525 DEG C.
The present invention has the advantages that compared with prior art：This technique is fed intake molten by the strict proportioning of raw material
Melt timesharing to operate in batches, carborundum is added between feeding intake twice, change traditional melting process, utilize dam formula nodularization bag
Nodulizer is protected with reference to the inovulant of compacting, to control time and the mode of nodularization, and is that nodularization is remixed in batches, reaches
Chemical composition is preferable after preferable nodularization effect, the stove of final products, and metallographic Testing index is excellent, and mechanical property is had outstanding performance,
Fully meet the service requirement of valve low temperature environment.
Embodiment
The explanation by taking 2000kg electric furnace as an example.
Embodiment 1
A kind of casting technique of Low-temperature high-tenacity nodular cast iron butterfly type valve, comprises the following steps：
One) melting process
1st, get the raw materials ready
Each material is weighed according to following mass percent proportioning：Pig iron 400kg, carbon steel 775kg, foundry returns 785kg, increasing
Carbon agent 33kg, carborundum 5kg and molten iron pretreating agent 2kg；
Wherein raw material is chosen：
The pig iron：Using high-quality spheroidal graphite cast iron pig iron Q10：
Chemical composition：One group of one class of one-level：
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, no slag, without sand material, non-corroding, lumpiness is uniform；
Carbon steel：Non-corroding, free from admixture, minimum thickness are not less than 5mm；
Foundry returns：Using 400-18 foundry returns, foundry returns needs to carry out Shot Blasting；
Carburant：It is the carburant Jing Guo high temperature drying graphitization processing using the special carburant of spheroidal graphite cast-iron；
Fixed carbon >=98%, sulphur content≤0.05%, ash content≤0.5%, fugitive constituent≤0.5%, moisture≤0.5%, N≤
400ppm, granularity 1-5mm；
Carborundum：Carborundum content 90%, silicon content 60-63%, phosphorus content 25-28%, granularity 0.2-10mm；
Molten iron pretreating agent：Siliceous 65%；
2nd, melting
1) put into the pig iron, carburant and carbon steel successively into medium-frequency induction furnace to be melted, the addition of the pig iron
Measure as step one) described in 1 the 1/3 of pig iron full dose, the addition of the carburant be step one) carburant described in 1
Full dose, the addition of the carbon steel is step one) carbon steel full dose described in 1 1/2；
2) after melting 2 minutes by step one) the remaining pig iron, remaining carbon steel, carborundum and foundry returns are put into successively in 1
In electric furnace；
3) step one is added after 5 minutes in 1390 DEG C of heating) molten iron pretreating agent described in 1, stand 1 minute；
4) molten iron temperature is come out of the stove at 1550 DEG C；
Two) nodularization and process is bred
1st, dam formula nodularization bag is preheated through molten iron；
2nd, nodulizer is put into the nodularization bag bottom side, and covers the thick silicon barium calcium inovulants of 4mm, is then covered
The mach iron filings of spheroidal graphite cast-iron, then tamp, and are finally capped spheroidal graphite cast-iron cover plate；The nodulizer 39kg, the 4mm thickness
Silicon barium calcium inovulant 20kg；
3rd, molten iron temperature is at 1520 DEG C, the step one) 2, molten iron 4) pour into molten iron in stove from electric furnace to nodularization bag
The 63% of total amount, pours into the nodularization bag bottom opposite side, pour into after finishing reach poured into after the spheroidizing reacion time in electric furnace remain
Remaining molten iron；
4th, 2 minutes are stood, is skimmed while covering Slag conglomeration agent；
5th, it is ladle-to-ladle to breed
5.1st, 500kg dam type pouring ladle is preheated through molten iron；
5.2nd, 4kg silicon barium calcium inovulant, silicon barium calcium inovulant granularity 1-3mm are delivered to casting ladle bottom；
5.3rd, the molten iron poured into casting ladle after nodularization, adds and accounts for molten iron weight again when pouring into half molten iron into ladle
Measure 1kg silicon barium calcium inovulant, silicon barium calcium inovulant granularity 1-3mm；
5.4th, stand and skim simultaneously for 1 minute；
Nodulizer：Using QR Mg6Re2 nodulizers；
Mg5-7%, Re1.5-2.5%, Si42-44%, Ca2-3%, Al≤0.5%, Ti≤0.05%,
Content of magnesia≤1%；
Lumpiness：5-25mm；
Inovulant：Barinoc silicon barium calcium inovulant Si72-77%, Bi2-3%, Ca1-2%, Al0.8-1.5%, granularity
1-3mm；
Three) pour into a mould, pull out case process
1st, using step 2) 5.4 molten iron temperature poured into a mould at 1420 DEG C, controls the hardness Type B hardometer of die cavity
More than 85；
2nd, with stream instant inoculation：In beam is poured, the casting sulphur of weight of molten iron 0.1%, oxygen inovulant are added with stream, sulphur,
Oxygen inovulant granularity 0.2-0.8mm；The iron water amount for adding casting molten iron with stream is determined according to the size of model casting；
3rd, the duration of pouring is controlled：It need to terminate to be poured for 9 minutes in nodularization；
4th, it is to be cast complete 4.5 hours after, 540 DEG C of casting temperature is unpacked and pulls out part；
5th, dead head formation blank is removed；
Four) heat treatment step
1st, blank is loaded after heat-treatment furnace, control temperature heats up 90 DEG C per hour, is warming up to 770 DEG C；
2nd, 3 hours are incubated；
3rd, cold stoking is cooled down, and is cooled to 600 DEG C and is come out of the stove, normal temperature is continued cool to after coming out of the stove.
Embodiment 2
Difference from Example 1 is：
In step one) 1, weigh each material according to weight when getting the raw materials ready：Pig iron 380kg, carbon steel 787kg, melt down
Expect 797kg, carburant 20kg, carborundum 4kg and molten iron pretreating agent 2kg；
In step 2) 3, molten iron temperature at 1520 DEG C, the step one) 2, molten iron 4) pours into from electric furnace to nodularization bag
The 60% of molten iron total amount in stove, pours into the nodularization bag bottom opposite side, pours into after finishing and poured into after reaching the spheroidizing reacion time
Remaining molten iron in electric furnace；
After four) 1, by blank loading heat-treatment furnace, control temperature heats up 85 DEG C per hour, is warming up to 755 DEG C.
The difference from Example 1 of embodiment 3 is：
A kind of casting technique of Low-temperature high-tenacity nodular cast iron butterfly type valve, comprises the following steps：
One) melting process
1st, get the raw materials ready
Each material is weighed according to following mass percent proportioning：Pig iron 380kg, carbon steel 787kg, foundry returns 797kg, increasing
Carbon agent 20kg, carborundum 4kg and molten iron pretreating agent 2kg；
2nd, melting
1) put into the pig iron, carburant and carbon steel successively into medium-frequency induction furnace to be melted, the addition of the pig iron
Measure as step one) described in 1 the 1/3 of pig iron full dose, the addition of the carburant be step one) carburant described in 1
Full dose, the addition of the carbon steel is step one) carbon steel full dose described in 1 1/2；
2) after melting 2 minutes by step one) the remaining pig iron, remaining carbon steel, carborundum, foundry returns are put into successively in 1
In electric furnace；
3) at 1420 DEG C, heating adds step one after 5 minutes) molten iron pretreating agent described in 1, stand 1 minute；
4) molten iron temperature is come out of the stove at 1570 DEG C；
Two) nodularization and process is bred
1st, dam formula nodularization bag is preheated through molten iron；
2nd, nodulizer is put into the nodularization bag bottom side, and covers the thick silicon barium calcium inovulants of 4.5mm, is then covered
The mach iron filings of lid spheroidal graphite cast-iron, then tamp, and are finally capped spheroidal graphite cast-iron cover plate；The nodulizer 42kg, the 4.5mm
Thick silicon barium calcium inovulant 15kg；
3rd, molten iron temperature is at 1515 DEG C, the step one) 2, molten iron 4) pour into molten iron in stove from electric furnace to nodularization bag
The 65% of total amount, pours into the nodularization bag bottom opposite side, pour into after finishing reach poured into after the spheroidizing reacion time in electric furnace remain
Remaining molten iron；
4th, 1.5 minutes are stood, is skimmed while covering Slag conglomeration agent；
5th, it is ladle-to-ladle to breed
Three) pour into a mould, pull out case process
1st, using step 2) 5.4 molten iron temperature poured into a mould at 1400 DEG C, controls the hardness Type B hardometer of die cavity
More than 85；
2nd, with stream instant inoculation；
3rd, the duration of pouring is controlled：It need to terminate to be poured for 8 minutes in nodularization；
4th, it is to be cast complete 4 hours after, 400 DEG C of casting temperature is unpacked and pulls out part；
5th, dead head formation blank is removed；
Four) heat treatment step
1st, blank is loaded after heat-treatment furnace, control temperature heats up no more than 75 DEG C per hour, is warming up to 720 DEG C；
2nd, 3 hours are incubated；
3rd, cold stoking is cooled down, and is cooled to 580 DEG C and is come out of the stove, normal temperature is continued cool to after coming out of the stove.
The blank of above example technical scheme is separately sampled to be detected, metal lographic examination sampling requirement is sampled as cast
Last type test lug or test lug；Last type casting body sampling of mechanical property sampling requirement.
Finished product is through examining：
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≤
The V of the Al of the Bi of the Mo of 0.1% Cr≤0.02≤0.01%≤0.015% Ti≤0.03%Pb≤0.02%≤0.005%≤
0.02%
Metal lographic examination：The cementite of Oxygen potential >=85% (more than 90% be I grades graphite) matrix ferrite F >=90%≤
1%；Without iron phosphide eutectic.
Mechanical property：Using the test block of 25mm Y-shapeds, it is necessary to cast two groups, one group is that as cast condition is examined, and one group is inspection after heat treatment
Test.
Tensile strength sigma b >=415Mpa
0.2 >=250MPa of yield strength σ；
Elongation percentage 6 >=18%；
Normal temperature ballistic work >=13J；
More than body hardness 140HB.
Molten iron pretreating agent, a variety of inovulants and nodulizer are all casting industry conventional selections.
Molten iron preheating, which refers to be poured into casting ladle and nodularization bag with the molten iron of melting, carries out short stay, is being added instead after pouring out
It is multiple to carry out, the inner wall temperature of casting ladle and nodularization bag is risen to molten iron temperature, such operation is the routine operation of casting field,
Flame heat temperature raising can be used, can according to demand and environmental selection.
Claims (8)
1. a kind of casting technique of Low-temperature high-tenacity nodular cast iron butterfly type valve, it is characterised in that：Comprise the following steps：
One) melting process
1st, get the raw materials ready
Each material is weighed according to following mass percent proportioning：Pig iron 12-22%, carbon steel 35-43%, foundry returns 41-49%,
Carburant 1.0-2.0%, carborundum 0.1-0.3% and molten iron pretreating agent 0.05-0.1%；
2nd, melting
1) put into the pig iron, carburant and carbon steel successively into electric furnace to be melted, the addition of the pig iron is step one) 1
Described in pig iron full dose 1/3, the addition of the carburant be step one) full dose of carburant described in 1, the carbon
The addition of plain steel is step one) 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, carborundum and foundry returns put into electricity successively in 1
In stove；
3) it is being not less than 1360 DEG C, is being not above at a temperature of 1450 DEG C, heating adds step one after 5 minutes) iron described in 1
Water pretreatment agent, stands 1-2 minutes；
4) molten iron temperature is come out of the stove at 1520-1580 DEG C；
Two) nodularization and process is bred
1st, dam formula nodularization bag is preheated through molten iron；
2nd, nodulizer is put into the nodularization bag bottom side, and covers the thick silicon barium calcium inovulants of 4-5mm, ball is then covered
The black mach iron filings of cast iron, then tamp, and are finally capped spheroidal graphite cast-iron cover plate；The nodulizer consumption is molten iron total amount
1.5-2.5%, silicon barium calcium the inovulant thick 4-5mm accounts for the 0.5-1.5% of molten iron total amount；
3rd, the step one) molten iron 4) pours into the 60-65% of molten iron total amount in stove from electric furnace to nodularization bag, pours into the nodularization
Bottom opposite side is wrapped, is poured into after finishing and is reached remaining molten iron in electric furnace is poured into after the spheroidizing reacion time；
4th, 1-2 minutes are stood, is skimmed while covering Slag conglomeration agent；
5th, it is ladle-to-ladle to breed
5.1st, casting ladle is preheated through molten iron；
5.2nd, the silicon barium calcium inovulant that casting ladle contains weight of molten iron 0.5-1%, silicon barium calcium inovulant granularity are delivered to casting ladle bottom
1-3mm；
5.3rd, the molten iron poured into casting ladle after nodularization, adds and accounts for weight of molten iron again when pouring into half molten iron into ladle
0.2% silicon barium calcium inovulant, silicon barium calcium inovulant granularity 1-3mm；
5.4th, stand and skim simultaneously for 0.5-1 minutes；
Three) pour into a mould, pull out case process
1st, using step 2) 5.4 molten iron temperature poured into a mould at 1380-1450 DEG C, controls the hardness Type B hardometer of die cavity
More than 85；
2nd, with stream instant inoculation：In beam is poured, sulphur, the oxygen inovulant of casting weight of molten iron 0.1% are added with stream, sulphur, oxygen are pregnant
Educate agent granularity 0.2-0.8mm；
3rd, the duration of pouring is controlled：It need to terminate to be poured no more than 10 minutes in nodularization；
4th, it is to be cast complete 4 hours after, casting temperature be no more than 550 DEG C after unpack pulls out part；
5th, dead head formation blank is removed；
Four) heat treatment step
1st, blank is loaded after heat-treatment furnace, control temperature heats up no more than 90 DEG C per hour, is warming up to 720-770 DEG C；
2nd, 3 hours are incubated；
3rd, cold stoking is cooled down, and is cooled to 550-600 DEG C and is come out of the stove, normal temperature is continued cool to 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, it is characterised in that：The step
It is rapid that 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, it is characterised in that：The step
It is rapid that two) 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, it is characterised in that：The step
Rapid one) 1 material got the raw materials ready need to meet following standard requirement：
The pig iron：Using high-quality spheroidal graphite cast iron pig iron Q10：
Chemical composition：One group of one class of one-level：
C ＞ 3.4%, Si 0.5-1%, 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, no slag, without sand material, non-corroding, lumpiness is uniform；
Carbon steel：Non-corroding, free from admixture, minimum thickness are not less than 5mm；
Foundry returns：Using 400-18 foundry returns, foundry returns needs to carry out Shot Blasting；
Carburant：It is the carburant Jing Guo high temperature drying graphitization processing using the special carburant of spheroidal graphite cast-iron；
Fixed carbon >=98%, sulphur content≤0.05%, ash content≤0.5%, fugitive constituent≤0.5%, moisture≤0.5%, N≤
400ppm, granularity 1-5mm；
Carborundum：Carborundum content 90%, silicon content 60-63%, phosphorus content 25-28%, granularity 0.2-10mm；
Molten iron pretreating agent：Siliceous 65%；
The step 2) in inovulant and nodulizer and the step 3) in sulphur, oxygen breed meet following standard will
Ask：
Nodulizer：Using QR Mg6Re2 nodulizers；
Mg 5-7%, Re 1.5-2.5%, Si 42-44%, Ca 2-3%, Al≤0.5%, Ti≤0.05%, content of magnesia
≤ 1%；
Lumpiness：5-25mm；
Inovulant：Using silicon barium calcium and sulphur, oxygen inovulant；
Barinoc silicon barium calcium inovulants Si 72-77%, Bi 2-3%, Ca 1-2%, Al 0.8-1.5%, granularity 1-3mm；
Sulphur, oxygen inovulant granularity 0.2-0.8mm.
5. the casting technique of Low-temperature high-tenacity nodular cast iron butterfly type valve according to claim 1, it is characterised in that：Nodularization is anti-
According to 2-3 minutes per ton calculating between seasonable, determined according to furnace volume.
6. the casting technique of the Low-temperature high-tenacity nodular cast iron butterfly type valve according to claim any one of 1-5, its feature exists
In：The step one) 2,3) add molten iron pretreating agent after stand 2 minutes.
7. the casting technique of Low-temperature high-tenacity nodular cast iron butterfly type valve according to claim 6, it is characterised in that：The step
The rapid molten iron that nodularization bag two) is poured into 3 is the 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, it is characterised in that：The step
It is rapid two) 2 nodularization temperature be 1515-1525 DEG C.
Priority Applications (1)
| 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)
| 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 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105385802A CN105385802A (en) | 2016-03-09 |
| CN105385802B true CN105385802B (en) | 2017-07-14 |
Family
ID=55418575
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510873728.XA Active CN105385802B (en) | 2015-12-03 | 2015-12-03 | The casting technique of Low-temperature high-tenacity nodular cast iron butterfly type valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105385802B (en) |
Families Citing this family (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| CN113416900B (en) * | 2021-06-28 | 2022-02-01 | 南京晓庄学院 | Alloy-enhanced high-carbon-based carbon steel casting material and casting method thereof |
| 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 |
| 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 |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101649369B (en) * | 2009-08-28 | 2012-03-21 | 河南省四达仙龙实业有限公司 | Melting process for producing synthetic cast iron by utilizing SiC carburizing siliconizing |
| CN101708540A (en) * | 2009-11-16 | 2010-05-19 | 江苏力源金河铸造有限公司 | Process for nodular cast iron cylinder body |
| CN101760689B (en) * | 2009-12-30 | 2011-11-30 | 山东汇金股份有限公司 | Method for producing low-temperature impact resistance high-strength nodular cast iron |
| CN103882175B (en) * | 2014-03-31 | 2016-04-27 | 江苏力源金河铸造有限公司 | The method of a kind of molten iron production two kinds of trade mark low-temperature spheroidal irons |
-
2015
- 2015-12-03 CN CN201510873728.XA patent/CN105385802B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN105385802A (en) | 2016-03-09 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105385802B (en) | The casting technique of Low-temperature high-tenacity nodular cast iron butterfly type valve | |
| CN101716651B (en) | Method for casting turbo supercharger volute shell casting for large ship | |
| CN101760689B (en) | Method for producing low-temperature impact resistance high-strength nodular cast iron | |
| CN106811676A (en) | A kind of high-intensity high-tenacity as cast condition QT700 10 and its production method | |
| CN1112266C (en) | Casting technology and apparatus for producing die-cast ingot, castings and conticast billet | |
| CN108085580A (en) | A kind of high intensity, high tenacity cast condition ductile iron and its production method | |
| CN101585078A (en) | Method for casting as-cast high-tenacity cast iron bearing cover of locomotive | |
| CN102230140B (en) | Martensitic wear resistant steel production technology | |
| CN104480382B (en) | Method for preparing centrifugal nodular cast iron pipe | |
| CN106191640A (en) | A kind of ductile cast iron material and preparation method thereof | |
| CN109609836B (en) | Production method of as-cast thick large-section nodular cast iron and cast product thereof | |
| CN106435342A (en) | Casting technology of low-temperature and high-tenacity spheroidal graphite cast iron butterfly valve containing carbides | |
| CN103352161A (en) | Ductile iron casting and casting process thereof | |
| CN104152793B (en) | QT500-7 heavy section casting quality and the method for Composition Control | |
| CN103882175A (en) | Method for producing two brand numbers of low-temperature ductile irons by adopting molten iron | |
| CN101407015B (en) | Method for manufacturing vermicular cast iron trolley body | |
| CN105441782A (en) | Ductile iron casting and manufacturing method thereof | |
| CN105755360A (en) | Preparation technology of vermicular cast iron with high pearlite and stable vermiculation | |
| CN102978486A (en) | Aluminum alloy casting forming method for valve clack of sluice valve | |
| CN103436810A (en) | Production process for steel casting of martensitic wear-resistant steel | |
| CN108220752A (en) | A kind of high-strength high temperature-resistant spheroidal graphite cast-iron and nodular cast iron pipe fittings casting technique | |
| CN102078956B (en) | Method for casting mechanical arm casting of robot | |
| KR101605905B1 (en) | Cgi cast iron and preparation method thereof | |
| CN102433494B (en) | High-strength low-stress cast iron material and preparation process thereof | |
| CN103451512A (en) | Method of obtaining as-cast pearlitic ductile iron by adding alloy elements |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB02 | Change of applicant information | ||
| CB02 | Change of applicant information |
Address after: 050000 Huaihe Road, Shijiazhuang hi tech Zone, Hebei, No. 191 Applicant after: Hebei Yulong Polytron Technologies Inc Address before: 050000 Shijiazhuang high tech Industrial Development Zone, Emei Road, Hebei Applicant before: Hebei Yulong Casting Co., Ltd. |
|
| GR01 | Patent grant | ||
| GR01 | Patent grant |