CN103725949B - The production method of high Ni austenite spheroidal iron vapor pipe - Google Patents
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Abstract
The present invention relates to a kind of production method of high Ni austenite spheroidal iron vapor pipe, complete through batching, fusing, spheroidizing, cast and stokehold chemical examination.Charge composition is: the pig iron 30% ± 0,5%, steel scrap 10% ± 0.5%, foundry returns 20% ± 0.5%, high purity nickel 30% ± 0.3%, manganeseirom 1% ± 0.1%, ferro-silicon 6.4% ± 0.2%, ferrochrome 2.2% ± 0.1% and electrolytic copper 0.4% ± 0.1%.During fusing, first add high purity nickel, after add other alloy, the Si content of base iron is 3.4% ~ 3.6%; During spheroidizing, nodulizing agent select Mg content 18% ~ 20% Ni-Mg alloy; The spheroidization treatment temperature of molten iron is 1600 DEG C ~ 1620 DEG C; During cast, adopt long-acting nucleating agent and 75FeSi, add-on is 0.5% of fusing weight; And adopting the instant inoculation of fusing weight 0.2%, teeming temperature is 1420 DEG C ~ 1460 DEG C.Experiment proves, adopt the Diesel Engine Exhaust Pipe that the production technique of the present invention is manufactured, yield rate reaches more than 90%.
Description
Technical field
The present invention relates to the foundry engieering of field of metallurgy, specifically the production method of high-temperature-resistant exhaust pipe.
Background technology
Power Diesel Engine Exhaust Pipe peculiar to vessel adopts common vermicular cast iron and the casting of high silicon spheroidal graphite cast iron to form.Stokehold is through compactedization, nodularization and inoculation.The tolerable temperature of conventional vapor pipe is less than 600 DEG C.The high temperature steel Ni content about 20% of the Cr25-Ni20 of Europe VI standard in 2005; The high temperature steel Ni content about 35% of the X-Ni-Si-Cr35-5-2 in European standard NFEN13835 standard, part import charges is expensive.This high Ni ductile iron production technique is harsh, and stokehold process is slightly inconsiderate, will cause waste product, there is following difficult point in actual production:
A) cast difficulty large: carbon amounts is low, smelting temperature high (>=1580 DEG C), teeming temperature high (about 1460 DEG C), and body shrinks large, poor fluidity, mushy freezing, feeding difficulty, shrinkage porosite tendency is large, and product yield is low.
B) geometry, dimensional requirement are high: part has the three-port structure of curvature of space, Liang Ge garden flange, five angle flanges, and the face of splitting is curved surface.Conventional wall thickness only has 10mm. thickness wall thickness 60mm, and wall thickness difference great disparity, exists independent thermal center.Five angle flange jib-length 600mm, are not easy to water completely.The variation off tolerance of thickness of flange, part length, mutual alignment size is narrow: ± 0.1 mechanical workout not easily ensures.
C) the part requirements water test: 0.6MPa, pressurize 15Min.
D) belong to high alloy material, component requirements is tight:
The chemical composition required in (table 1) European standard NFEN13835
Because alloy content is up to 40%, cause iron liquid to produce serious super cooling tendency, greying is bad, abnormal nodularizing, and in addition, the air-breathing tendency of alloy is larger, and fusing point is also higher, strict to the requirement of equipment.
E) material performance requirement is high:
The mechanical property required in (table 2) NFEN13835
| Material | Tensile strength σb / MPa | Yield strength σ0. 2 / MPa | Elongation δ( %) | HB |
| X-Ni-Si-Cr35-5-2 | ≥370 | ≥200 | ≥10 | 140～190 |
Summary of the invention
The object of the invention is to, the Foundry Production novel process of a kind of desirable Langaloy X-Ni-Si-Cr35-5-2 is provided, improve casting qualified rate, realize production domesticization.
concrete technical scheme of the present invention is:
The production technique of the Langaloy X-Ni-Si-Cr35-5-2 of the present invention, mainly chemically examined through batching, fusing, spheroidizing, cast and stokehold chemical composition, idiographic flow is as follows:
the flow process the first step: charge composition
According to stokehold chemical composition requirement, contain in charge composition: the pig iron 30% ± 0,5%, the add-on of steel scrap 10% ± 0.5%, foundry returns 20% ± 0.5%, high purity nickel 30% ± 0.3%, manganeseirom 1% ± 0.1%, ferro-silicon 6.4% ± 0.2%, ferrochrome 2.2% ± 0.1% and electrolytic copper 0.4% ± 0.1%.
In charge composition, select 20% high Ni foundry returns----can material cost be reduced; Remaining Mg----simultaneously containing 0.04-0.05% in foundry returns effectively can improve the Oxygen potential of material, mechanical property and heat resisting temperature;
In charge composition, the C content that improve alloy by the add-on improving the pig iron improves C, and its effect is as follows:
1 improves the spheroidizing effect that C content can promote aluminium alloy, and C belongs to promotion graphite element, and the globular graphite that can effectively increase in alloy graining process separates out quantity.
After 2 globular graphite quantity increase, the graphitization expansion effect of alloy in process of setting improves, and effectively can reduce the body shrinkage tendency in alloy graining process, can eliminate the shrinkage defect of foundry goods.
flow process second step: fusing
Because the fusing point of nickel is higher than iron, in medium-frequency induction furnace, first add the pig iron and steel scrap, therefore should carry out adding high purity nickel again after fusing forms molten bath in power transmission, finally add other alloy.After whole stove alloy is melting down, composition detection is carried out in sampling.
Before spheroidizing, base iron chemical composition performs according to following table:
The Si content of base iron (referring to the molten iron not doing spheroidizing) is controlled between 3.4% ~ 3.6%.In base iron Composition Control, according to the chemical composition requirement in European standard NFEN13835, the nodulizing agent used when considering aluminium alloy spheroidizing and nucleating agent belong to ferro-silicon, the silicon content of aluminium alloy can be increased, for guaranteeing that the alloy si content after spheroidizing is between 4.5% ~ 5.5%, through calculating, the Si content of base iron is controlled between 3.4% ~ 3.6%.
flow process the 3rd step: the spheroidizing technology of traditional method
After aluminium alloy composition detection is qualified, by toppling over of aluminium alloy pack processing---carry out spheroidizing.
Nodulizing agent select Mg content 18% ~ 20% Ni-Mg alloy.This is because: the Mg content of common ferrosilicon magnesium alloy is lower, and molten iron treatment temp is high, and Mg scaling loss is serious, is difficult to reach nodularization effect, and the present invention is high by Ni-Mg alloy melting point, " similar mix " principle, effectively can put forward heavy alloyed residual Mg level; In addition, because the fusing point of high Ni spheroidal graphite cast iron is high, the features such as alloy flowability is poor, viscosity is large, setting rate is very fast, cause the precipitation of graphite in molten steel solidification process and grow into spherical insufficient, therefore the content requirement of element M g is affected on nodularization higher, reached a conclusion by the quantitative chemical composition analysis of mechanicl test, metallurgical analysis, alloy and the mass data check analysis after producing in batches: when remaining Mg content >=0.080% of high Ni austenite ductile cast iron, the austenite ductile cast iron that Oxygen potential is higher can be obtained; When remaining Mg content≤0.080%, easily cause abnormal nodularizing phenomenon; For ensureing remaining Mg content >=0.080%, we select Mg content 18% ~ 20% Ni-Mg alloy as nodulizing agent, the burn out rate of Mg calculates by 40%, when nodulizing agent add-on is 0.8%, can ensure remaining Mg content >=0.080%.
High Ni austenite ductile cast iron spheroidizing adopts " sandwich " to process; As Fig. 2:
Described " sandwich ", is first loaded by nodulizing agent in nodularization dykes and dams, after consolidation is paved, then covers on nodulizing agent by nucleating agent, finally cover on nucleating agent with steel plate.Nodulizing agent add-on be liquid heavy 0.8%, innoculant adding quantity be liquid heavy 1.2%.
Adopt " sandwich " that the nodularization time of molten iron can be postponed, if nodulizing agent and too early the contacting with molten iron of nucleating agent, in advance spheroidizing reacion will occur, and cause molten iron to occur decaying spheroidisation too early, and finally have influence on material and the performance of alloy.
The spheroidization treatment temperature of molten iron selects 1600 DEG C ~ 1620 DEG C---because the alloy content of material is higher, and the features such as castability difference, therefore spheroidization treatment temperature is slightly higher.
flow process the 4th step: cast
After spheroidizing terminates, aluminium alloy spheroidizing bag is transported to cast scene and carries out casting pouring.
During cast, adopt long-acting nucleating agent INOCULIN390 (production of Jiangsu Fushi Ke Zhong Co., Ltd) and 75FeSi, add-on is 0.5% of fusing weight; And adopt the INOCULIN400 of 0.2% of fusing weight (nucleating agent that Jiangsu Fushi Ke Zhong Co., Ltd produces) as instant inoculation, to pour with stream in casting process.Its objective is and improve following situation: austenite spheroidal iron is faster than common magnesium iron inoculation fade, particularly containing Cr austenite spheroidal iron, breed bad, foundry goods is easy to produce shrinkage cavity and porosity defect.
During cast, use the nucleating agent (Ca:0.5%-1.5%, Ba:8%-11%) containing calcium, barium----this nucleating agent can be made in low-sulfur, high-sulfur cast iron all to have good inoculation(effect) by comprehensive action; Use nucleating agent (the Bi:0.8%-1.3%) [baric in INOCULIN390 nucleating agent composition containing Bi, containing Bi in INOCULIN400 nucleating agent composition], the number of graphite ball of unit surface, refinement graphite pebbles can be significantly improved, improve the Oxygen potential high Ni austenite ductile cast iron that especially casting fluidity is poor, viscosity is high.
Teeming temperature selects 1420 DEG C ~ 1460 DEG C to pour into a mould, and teeming temperature is too low there will be the phenomenons such as the sticky bag of foundry goods cold shut, whitening, abnormal nodularizing and molten iron
Because the shrinkage tendency of high Ni alloy is larger, the thick large part of foundry goods must arrange insulated feeder, especially at thick large flange position, is conducive to feeding and the die cavity exhaust of foundry goods.
Technique chill is increased at the heat energy-saving position of foundry goods---due to spheroidal graphite cast iron mushy freezing feature, especially high Ni austenite ductile cast iron setting time section, Feeding channel are narrow, must increase technique chill, ensure the Equilibrium Solidification of foundry goods at the heat energy-saving position of foundry goods.
Use high-precision metal mould: Common Difference & Cooperation meet Js (deviation=IT12/2) class precision and require---reduce the process redundancy of foundry goods to greatest extent, ensure dimensional stability, be conducive to the shrinkage porosite tendency eliminating heat energy-saving position, improve the chill effect of chill, ensure dense structure's property in Mechanical processing of casting face.
the invention has the beneficial effects as follows:
Adopt the 18PA6B Diesel Engine Exhaust Pipe that the production technique of the present invention is manufactured, complete self-made components installation, experiment proves, foundry goods is after process water examination, yield rate can reach more than 90% (being 0 originally), so the present invention has successfully grasped the core technology that austenite ductile cast iron pipeline section is produced, and has broken away from the expensive predicament of this type of part of import.
Accompanying drawing explanation
Fig. 1 is Production Flow Chart schematic diagram of the present invention;
Fig. 2 is the casting ladle schematic diagram of the embodiment of the present invention.
Embodiment
Below in conjunction with three embodiments, the present invention will be further described.
The production technique of following embodiment, is all through batching, fusing, spheroidizing, cast and stokehold chemical composition and has chemically examined, as shown in Figure 1; High Ni austenite ductile cast iron spheroidizing adopts " sandwich " to process, as shown in Figure 2.
embodiment 1produce the vapor pipe of the discharge high-temperature gas of 18PA6B diesel engine, its processing step is as follows:
1) stokehold chemical composition is:
the flow process the first step: according to stokehold chemical composition requirement, carry out accurate charge composition calculating, determine the add-on of the pig iron 30%, steel scrap 10%, foundry returns 20%, high purity nickel 30%, manganeseirom 1%, ferro-silicon 6.4%, ferrochrome 2.56% and electrolytic copper 0.4%.
In charge composition, select 20% high Ni foundry returns;
flow process second step: fusing.First add the pig iron and steel scrap, add high purity nickel again behind formation molten bath to be melted, finally add other alloy.After whole stove alloy is melting down, samples and carry out composition detection by spectrum real-time analysis.
Before spheroidizing, base iron chemical composition performs according to following table:
The Si content of base iron is controlled between 3.4% ~ 3.6%.
flow process the 3rd step: after aluminium alloy composition detection is qualified, aluminium alloy is poured in spheroidizing bag---carry out spheroidizing.
Nodulizing agent select Mg content 18% ~ 20% Ni-Mg alloy.
High Ni austenite ductile cast iron spheroidizing adopts " sandwich " to process.
The spheroidization treatment temperature of molten iron selects 1600 DEG C ~ 1620 DEG C---because the alloy content of material is higher, and the features such as castability difference, therefore spheroidization treatment temperature is slightly higher.
flow process the 4th step: after spheroidizing terminates, aluminium alloy spheroidizing bag is transported to cast scene and carries out casting pouring.
During cast, adopt long-acting nucleating agent INOCULIN390 (production of Jiangsu Fushi Ke Zhong Co., Ltd) and 75FeSi, add-on is 0.5% of fusing weight; And adopt the INOCULIN400 of 0.2% of fusing weight (nucleating agent that Jiangsu Fushi Ke Zhong Co., Ltd produces) as instant inoculation, to pour with stream in casting process.
During cast, use the nucleating agent (Ca:0.5%-1.5%, Ba:8%-11%) containing calcium, barium; Use the nucleating agent (Bi:0.8%-1.3%) containing Bi.
Teeming temperature selects 1420 DEG C ~ 1460 DEG C to pour into a mould.
Because the shrinkage tendency of high Ni alloy is larger, the thick large part of foundry goods arranges insulated feeder.
Increase technique chill at the heat energy-saving position of foundry goods, ensure the Equilibrium Solidification of foundry goods.
Use high-precision metal mould: Common Difference & Cooperation meet Js (deviation=IT12/2) class precision requirement.
embodiment 2
1) stokehold chemical composition performs according to following table:
Charge composition: according to stokehold chemical composition requirement, carries out accurate charge composition calculating,
Pig iron 30%+0,5%, steel scrap 10%-0.5%, foundry returns 20%+0.5%, high purity nickel 30%-0.3%, manganeseirom 1%+0.1%, ferro-silicon 6.4%-0.2%, ferrochrome 2.2%+0.1% and electrolytic copper 0.4%-
The add-on of 0.1%.＋－
In base iron Composition Control, we are according to the chemical composition requirement in European standard NFEN13835, the nodulizing agent used when considering aluminium alloy spheroidizing and nucleating agent belong to ferro-silicon, the final silicon content of aluminium alloy can be increased, for guaranteeing that the alloy si content after spheroidizing is between 4.5% ~ 5.5%, through calculating, the Si content of base iron is controlled between 3.4% ~ 3.6%.
2) austenite spheroidal iron is faster than common magnesium iron inoculation fade, particularly containing Cr austenite spheroidal iron, breeds bad, and foundry goods is easy to produce shrinkage cavity and porosity defect.Adopt long-acting nucleating agent: INOCULIN390 and 75FeSi for this reason, add-on divide be fusing weight 0.5%, and adopt fusing weight 0.2% INOCULIN400 as instant inoculation, pour with stream in casting process;
3) select 40% high Ni foundry returns to carry out proportioning in charge composition process, the remaining Mg containing 0.04-0.05% in foundry returns, effectively can improve the Oxygen potential of material, mechanical property and heat resisting temperature;
4) nucleating agent (Ca:1.0%, Ba:10%) containing calcium, barium is used;
5) nucleating agent (Bi1.3%) containing Bi is used;
7) nodulizing agent select Mg content 18% Ni-Mg alloy;
8) remaining Mg content >=0.080% of high Ni austenite ductile cast iron;
9) high Ni austenite ductile cast iron spheroidizing mode adopts " sandwich " to carry out processing (as described in Example 1).
10) spheroidization treatment temperature of molten iron selects 1600 DEG C ~ 1620 DEG C, and teeming temperature selects 1420 DEG C ~ 1460 DEG C to pour into a mould.
11) shrinkage tendency due to high Ni alloy is larger, and the thick large flange position of thermal center arranges insulated feeder.
12) technique chill is increased at the heat energy-saving position of foundry goods.
13) high-precision metal mould is used: Common Difference & Cooperation meet Js (deviation=IT12/2) class precision requirement.
embodiment 3
1) stokehold chemical composition performs according to following table:
Charge composition: pig iron 30%-0,5%, the add-on of steel scrap 10%+0.5%, foundry returns 20%-0.5%, high purity nickel 30%+0.3%, manganeseirom 1%-0.1%, ferro-silicon 6.4%+0.2%, ferrochrome 2.2%-0.1% and electrolytic copper 0.4%+0.1%.
In base iron Composition Control, according to the chemical composition requirement in European standard NFEN13835, the nodulizing agent used when considering aluminium alloy spheroidizing and nucleating agent belong to ferro-silicon, the final silicon content of aluminium alloy can be increased, for guaranteeing that the alloy si content after spheroidizing is between 4.5% ~ 5.5%, through calculating, the Si content of base iron is controlled between 3.4% ~ 3.6%.
2) adopt long-acting nucleating agent: INOCULIN390 and 75FeSi, add-on divide be fusing weight 0.5%, and adopt fusing weight 0.2% INOCULIN400 as instant inoculation, pour with stream in casting process;
3) 60% high Ni foundry returns is selected to carry out proportioning in charge composition process, the remaining Mg containing 0.04-0.05% in foundry returns;
4) use the nucleating agent (Ca:0.5%-1.5%, Ba:8%-11%) containing calcium, barium, this nucleating agent can be made in low-sulfur, high-sulfur cast iron all to have good inoculation(effect) by comprehensive action;
5) nucleating agent (Bi:1.0%) containing Bi is used;
7) nodulizing agent select Mg content 20% Ni-Mg alloy.
8) remaining Mg content >=0.080% of high Ni austenite ductile cast iron;
9) high Ni austenite ductile cast iron spheroidizing mode adopts " sandwich " to carry out processing (as embodiment 1):
10) spheroidization treatment temperature of molten iron selects 1600 DEG C ~ 1620 DEG C, and teeming temperature selects 1420 DEG C ~ 1460 DEG C to pour into a mould;
11) the thick large flange position of thermal center arranges insulated feeder;
12) technique chill is increased at the heat energy-saving position of foundry goods;
13) high-precision metal mould is used: Common Difference & Cooperation meet Js (deviation=IT12/2) class precision requirement.
The mechanical property of above-mentioned three embodiments (i.e. three stoves) product and the test data of metallographic structure as shown in the table:
| Numbering | σb / MPa | σ0. 2 / MPa | δ( %) | HB | Oxygen potential | Matrix |
| 1＃ | 334.4 | 182.6 | 5.0 | 137 | Graphite is excessively cold | The a large amount of L(ledeburite of A+) |
| 2＃ | 426.1 | 229.4 | 13.0 | 147 | VI+V,65% | The a large amount of L of A+ |
| 3＃ | 414.4 | 223.5 | 20.6 | 143 | VI+V,90% | A+ L |
The analysis of tune-up data in his-and-hers watches
By the test data analyzer to above three stoves, the graphite form of high Ni austenite spheroidal iron directly affects the mechanical property of this material, and simultaneously Ni, Si, residual Mg measure also has considerable influence to the mechanical property of this material and metallographic structure.
The final of nodulizing agent is selected, and because Mg content about 6%, the Mg comparision contents of ADLLOY6RE nodulizing agent is low, add-on is larger, and it contains higher rare earth, so select Mg content about 20% containing the Ni-Mg20 nodulizing agent of rare earth, add-on 0.8%.
Selecting of nucleating agent, nucleating agent adopts Fushi section INOCULIN390,75FeSi add-on each 0.5%, and adopts 0.2% Fushi section INOCULIN400 nucleating agent as instant inoculation, pours in casting process with stream.INOCULIN390, containing very high barium, promotes the formation of a large amount of nucleus, the significant prolongation inoculation fade time in the process bred; The comprehensive action of calcium, barium makes this nucleating agent all have good inoculation(effect) in low-sulfur, high-sulfur cast iron.INOCULIN400 is the iron alloy based on 75SiFe, containing Bi, is suitable for magnesium iron, can significantly improve the number of graphite ball of unit surface, refinement graphite pebbles, improves Oxygen potential.
5.1.1 the debug results, after process optimization
By the optimization to testing and measuring technology, applicant manufactures experimently continuously and produces 7 stoves, and result is all qualified, and mechanical property and metallographic structure see the following form:
| Numbering | σb / MPa | σ0. 2 / MPa | δ( %) | HB | Oxygen potential | Matrix |
| 1＃ | 424.4 | 297.1 | 20.8 | 140 | VI+V,90% | A+L |
| 2＃ | 442.1 | 300.6 | 26 | 142 | VI+V,91% | A+L |
| 3＃ | 424.4 | 237.3 | 29 | 142 | VI+V,92% | A+L |
| 4＃ | 391.8 | 210.9 | 13 | 152 | VI+V,90% | A+L |
| 5＃ | 427.5 | 231.6 | 29.2 | 140 | VI+V,92% | A+L |
| 6＃ | 410.9 | 221.9 | 17.6 | 144 | VI+V,90% | A+L |
| 7＃ | 427.7 | 256.4 | 16 | 152 | VI+V,90% | A+L |
By the trial-production of novel process produce we the most at last X-Ni-Si-Cr35-5-2 austenite ductile cast iron for the production of nuclear power 18PA6B Diesel Engine Exhaust Pipe.
5.2, the exploration of moulding process
The moulding process of high Ni ductile iron exhaust pipe is groped
Claims (4)
1. the production method of high Ni austenite spheroidal iron vapor pipe, this Langaloy X-Ni-Si-Cr35-5-2 system has chemically examined through batching, fusing, spheroidizing, cast and stokehold chemical composition, it is characterized in that: Production Flow Chart and processing method as follows:
the first step: charge composition
According to stokehold chemical composition requirement, charge composition is: the pig iron 30% ± 0,5%, steel scrap 10% ± 0.5%, high Ni foundry returns 20% ± 0.5%, high purity nickel 30% ± 0.3%, manganeseirom 1% ± 0.1%, ferro-silicon 6.4% ± 0.2%, ferrochrome 2.2% ± 0.1% and electrolytic copper 0.4% ± 0.1%;
In charge composition, select 20% high Ni foundry returns;
second step: fusing
Because the fusing point of nickel is higher than iron, in medium-frequency induction furnace, first add the pig iron and steel scrap, carry out adding high purity nickel after fusing forms molten bath in power transmission, finally add other alloy;
The Si content of base iron is controlled between 3.4% ~ 3.6%;
3rd step: spheroidizing
After aluminium alloy composition detection is qualified, aluminium alloy is poured in spheroidizing bag---carry out spheroidizing;
Nodulizing agent select Mg content 18% ~ 20% Ni-Mg alloy;
The spheroidization treatment temperature of molten iron selects 1600 DEG C ~ 1620 DEG C;
4th step: cast
After spheroidizing terminates, aluminium alloy spheroidizing bag is transported to cast scene and carries out casting pouring;
During cast, adopt long-acting nucleating agent INOCULIN390 and 75FeSi, add-on is 0.5% of fusing weight; And adopt the INOCULIN400 of 0.2% of fusing weight as instant inoculation, pour with stream in casting process;
During cast, use the nucleating agent containing calcium Ca:0.5%-1.5%, barium 8%-11%;
Teeming temperature is 1420 DEG C ~ 1460 DEG C and pours into a mould.
2. the production method of high Ni austenite spheroidal iron vapor pipe according to claim 1, it is characterized in that: the austenite ductile cast iron spheroidizing of described 3rd step, " sandwich " is adopted to process, namely, nodulizing agent is first loaded in nodularization dykes and dams, after consolidation is paved, again nucleating agent is covered on nodulizing agent, finally cover on nucleating agent with steel plate, nodulizing agent add-on be liquid heavy 0.8%, innoculant adding quantity be liquid heavy 1.2%.
3. the production method of high Ni austenite spheroidal iron vapor pipe according to claim 1, is characterized in that: the burning note technique of described 4th step, at the thick large flange position of foundry goods, is provided with insulated feeder.
4. the production method of high Ni austenite spheroidal iron vapor pipe according to claim 3, is characterized in that: the burning note technique of described 4th step, is provided with technique chill at the heat energy-saving position of foundry goods.
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| CN104985142A (en) * | 2015-07-09 | 2015-10-21 | 西峡县众德汽车部件有限公司 | High-nickel austenite nodular cast iron spheroidizing method and spheroidizing ladle |
| CN106521297B (en) * | 2016-11-26 | 2018-05-11 | 西峡县西泵特种铸造有限公司 | A kind of method for reducing Form in High Nickel Austenite Nodular Cast Iron turbine case internal flaw |
| CN111531129B (en) * | 2020-05-07 | 2022-10-14 | 陕西柴油机重工有限公司 | Method for improving hardness of speed reducer box body of cast iron pumping unit |
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| CN103074465A (en) * | 2012-12-12 | 2013-05-01 | 青岛三合山精密铸造有限公司 | Molten steel purifying and casting method |
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| CN102836968A (en) * | 2012-09-17 | 2012-12-26 | 辽宁远宇重工机械有限公司 | Forging method of high nickel ductile iron pressure-containing member for low temperature gas compression machinery used at temperature of minus 76 DEG C to minus 121 DEG C |
| CN103074465A (en) * | 2012-12-12 | 2013-05-01 | 青岛三合山精密铸造有限公司 | Molten steel purifying and casting method |
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