CN103725949A - Method for producing high-Ni austenite ductile iron exhaust pipe - Google Patents
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Abstract
The invention relates to a method for producing a high-Ni austenite ductile iron exhaust pipe. The method is finished by the following steps: batching, melting, spheroidizing, casting and testing in front of the furnace. The furnace charge comprises the following components: 30+/-0.5 percent of cast iron, 10+/-0.5 percent of steel scrap, 20+/-0.5 percent of foundry returns, 30+/-0.3 percent of high purity nickel, 1+/-0.1 percent of manganese iron alloy, 6.4+/-0.2 percent of ferrosilicon, 2.2+/-0.1 percent of ferrochrome and 0.4+/-0.1 percent of electrolytic copper. The method comprises the following steps: adding the high purity nickel during melting, and adding the other alloys, wherein the Si content of base iron is 3.4-3.6 percent; selecting Ni-Mg alloy of which the Mg content is 18-20 percent during spheroidizing, and the spheroidizing temperature of molten iron is 1600-1620 DEG C; during casting, adopting a long-acting inoculant and 75FeSi, wherein the addition amount is 0.5 percent of the melting weight; and performing instantaneous inoculation by adopting the melting weight of 0.2 percent, wherein the casting temperature is 1420-1460 DEG C. The experiment proves that the yield of a diesel engine exhaust pipe manufactured by the production process in the invention is over 90 percent.
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 wriggling, nodularization and inoculation.The tolerable temperature of conventional vapor pipe is less than 600 ℃.The high temperature steel Ni content approximately 20% of the Cr25-Ni20 of Europe VI standard in 2005; The high temperature steel Ni content approximately 35% of X-Ni-Si-Cr35-5-2 in European standard NF EN13835 standard, part import charges costliness.This high Ni ductile iron production technique harshness, stokehold is processed slightly inconsiderate, will cause waste product, has following difficult point in actual production:
A) casting difficulty is large: carbon amount is low, smelting temperature high (>=1 580 ℃), and teeming temperature high (1460 ℃ of left and right), 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, and five angle flanges, 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 full.The variation off tolerance of thickness of flange, part length, mutual alignment size is narrow: ± 0.1 mechanical workout is difficult for guaranteeing.
C) part requires the water test: 0.6MPa, pressurize 15Min.
D) belong to high alloy material, composition requires tight:
The chemical composition requiring in (table 1) European standard NF EN13835
Because alloy content is up to 40%, cause iron liquid to produce serious super cooling tendency, greying is bad, abnormal nodularizing, 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 requiring in (table 2) NF EN13835
| 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 present invention's Langaloy X-Ni-Si-Cr35-5-2, mainly completes through batching, fusing, spheroidizing, cast and the chemical examination of stokehold chemical composition, and idiographic flow is as follows:
the flow process the first step: charge composition
According to stokehold chemical composition requirement, in charge composition, contain: 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----material cost can be reduced; The remaining Mg----that simultaneously contains 0.04-0.05% in foundry returns can effectively improve nodularization rate, mechanical property and the heat resisting temperature of material;
In charge composition, the C content that has improved alloy by improving the add-on of the pig iron improves C, and its effect is as follows:
1 raising C content can promote the spheroidizing effect of aluminium alloy, and C belongs to promotion graphite element, and the globular graphite that can effectively increase in alloy graining process is separated out quantity.
After 2 globular graphite quantity increase, the graphitization expansion effect of alloy in process of setting improves, and the body that can effectively reduce in alloy graining process shrinks tendency, 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 melt after forming molten bath and add again high purity nickel in power transmission, finally add other alloy.After whole stove alloy melts clearly, composition detection is carried out in sampling.
Before spheroidizing, base iron chemical composition is carried out according to following table:
The Si content of base iron (referring to not do the molten iron of spheroidizing) is controlled between 3.4%～3.6%.In base iron Composition Control, according to the chemical composition requirement in European standard NF EN13835, the nodulizing agent and the nucleating agent that while considering aluminium alloy spheroidizing, use belong to ferro-silicon, can increase the silicon content of aluminium alloy, for guaranteeing that 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 selects Mg content at 18%～20% Ni-Mg alloy.This be 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 mixing " principle, can effectively 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 graphite in molten steel solidification process separate out and grow into spherical insufficient, therefore nodularization is affected to the content requirement of element M g higher, mass data check analysis after quantitative chemical composition analysis by mechanicl test, metallurgical analysis, alloy and batch production is reached a conclusion: when remaining Mg content >=0.080% of high Ni austenite ductile cast iron, can obtain the austenite ductile cast iron that nodularization rate is higher; When remaining Mg content≤0.080%, easily cause abnormal nodularizing phenomenon; For guaranteeing remaining Mg content >=0.080%, we select Mg content at 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 guarantee remaining Mg content >=0.080%.
High Ni austenite ductile cast iron spheroidizing adopts " Sanming City therapy " to process; As Fig. 2:
Described " Sanming City therapy ", is that nodulizing agent is first packed in nodularization dykes and dams, after consolidation is paved, then nucleating agent is covered on nodulizing agent, finally with steel plate, covers on nucleating agent.Nodulizing agent add-on be liquid heavy 0.8%, innoculant adding quantity be liquid heavy 1.2%.
Adopt " Sanming City therapy " can postpone the nodularization time of molten iron, if spheroidizing reacion will occur contact with molten iron too early with nucleating agent of nodulizing agent in advance, cause molten iron to occur too early decaying spheroidisation, finally have influence on material and the performance of alloy.
The spheroidization treatment temperature of molten iron is selected 1600 ℃～1620 ℃---due to features such as the alloy content of material are higher, and castability is poor, therefore spheroidization treatment temperature is slightly higher.
flow process the 4th step: cast
After spheroidizing finishes, aluminium alloy is transported to cast scene with spheroidizing bag and carries out casting pouring.
During cast, adopt long-acting nucleating agent INOCULIN 390 (production of Jiangsu Fushi Ke Zhong Co., Ltd) and 75FeSi, add-on is 0.5% of fusing weight; And adopt 0.2% the INOCULIN 400 (nucleating agent that Jiangsu Fushi Ke Zhong Co., Ltd produces) of fusing weight as instant inoculation, in casting process, with stream, to pour.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 badly, 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%) that contains calcium, barium----by comprehensive action, can make this nucleating agent all have good inoculation(effect) in low-sulfur, high-sulfur cast iron; Nucleating agent (the Bi:0.8%-1.3%) [baric in INOCULIN 390 nucleating agent compositions that use contains Bi, in INOCULIN 400 nucleating agent compositions containing Bi], can significantly improve unit surface number of graphite ball, refinement graphite pebbles, improve the nodularization rate high Ni austenite ductile cast iron that especially casting fluidity is poor, viscosity is high.
Teeming temperature is selected 1420 ℃～1460 ℃ and is poured into a mould, the too low phenomenons such as the sticky bag of foundry goods cold shut, whitening, abnormal nodularizing and molten iron that there will be of teeming temperature
Because the contraction 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.
At the heat energy-saving position of foundry goods, increase technique chill---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 at the heat energy-saving position of foundry goods, guarantee the Equilibrium Solidification of foundry goods.
Use high-precision metal mould: Common Difference & Cooperation meet Js (deviation=IT12/2) class precision and require---reduce to greatest extent the process redundancy of foundry goods, guarantee dimensional stability, be conducive to eliminate the shrinkage porosite tendency of heat energy-saving position, improve the chill effect of chill, guarantee dense structure's property of Mechanical processing of casting face.
the invention has the beneficial effects as follows:
The 18PA6B Diesel Engine Exhaust Pipe that adopts the present invention's production technique to manufacture, completed self-made components installation, experimental results show that, 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 embodiment, the present invention will be further described.
The production technique of following embodiment, all completes through batching, fusing, spheroidizing, cast and the chemical examination of stokehold chemical composition, as shown in Figure 1; High Ni austenite ductile cast iron spheroidizing adopts " Sanming City therapy " to process, as shown in Figure 2.
embodiment 1the vapor pipe of producing 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, after fusing forms molten bath, add again high purity nickel, finally add other alloy.After whole stove alloy melts clearly, sampling is carried out composition detection by spectrum real-time analysis.
Before spheroidizing, base iron chemical composition is carried out 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 selects Mg content at 18%～20% Ni-Mg alloy.
High Ni austenite ductile cast iron spheroidizing adopts " Sanming City therapy " to process.
The spheroidization treatment temperature of molten iron is selected 1600 ℃～1620 ℃---due to features such as the alloy content of material are higher, and castability is poor, therefore spheroidization treatment temperature is slightly higher.
flow process the 4th step: after spheroidizing finishes, aluminium alloy is transported to cast scene with spheroidizing bag and carries out casting pouring.
During cast, adopt long-acting nucleating agent INOCULIN 390 (production of Jiangsu Fushi Ke Zhong Co., Ltd) and 75FeSi, add-on is 0.5% of fusing weight; And adopt 0.2% the INOCULIN 400 (nucleating agent that Jiangsu Fushi Ke Zhong Co., Ltd produces) of fusing weight as instant inoculation, in casting process, with stream, to pour.
During cast, use the nucleating agent (Ca:0.5%-1.5%, Ba:8%-11%) that contains calcium, barium; The nucleating agent (Bi:0.8%-1.3%) that use contains Bi.
Teeming temperature is selected 1420 ℃～1460 ℃ and is poured into a mould.
Because the contraction tendency of high Ni alloy is larger, the thick large part of foundry goods arranges insulated feeder.
Heat energy-saving position at foundry goods increases technique chill, guarantees the Equilibrium Solidification of foundry goods.
Use high-precision metal mould: Common Difference & Cooperation meet the requirement of Js (deviation=IT12/2) class precision.
embodiment 2
1) stokehold chemical composition is carried out according to following table:
Charge composition: according to stokehold chemical composition requirement, carry 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%-
0.1% add-on.＋－
In base iron Composition Control, we are according to the chemical composition requirement in European standard NF EN13835, the nodulizing agent and the nucleating agent that while considering aluminium alloy spheroidizing, use belong to ferro-silicon, can increase the final silicon content of aluminium alloy, for guaranteeing that 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 badly, and foundry goods is easy to produce shrinkage cavity and porosity defect.Adopt long-acting nucleating agent: INOCULIN 390 and 75FeSi, add-on is divided and is 0.5% of fusing weight, and adopts 0.2% INOCULIN 400 of fusing weight as instant inoculation, in casting process, with stream, pours for this reason;
3) in charge composition process, select 40% high Ni foundry returns to carry out proportioning, in foundry returns, contain the remaining Mg of 0.04-0.05%, can effectively improve nodularization rate, mechanical property and the heat resisting temperature of material;
4) use the nucleating agent (Ca:1.0%, Ba:10%) that contains calcium, barium;
5) use the nucleating agent (Bi1.3%) that contains Bi;
7) nodulizing agent selects Mg content at 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 " Sanming City therapy " to process (as described in Example 1).
10) spheroidization treatment temperature of molten iron is selected 1600 ℃～1620 ℃, and teeming temperature is selected 1420 ℃～1460 ℃ and poured into a mould.
11) because the contraction tendency of high Ni alloy is larger, the thick large flange position of thermal center arranges insulated feeder.
12) at the heat energy-saving position of foundry goods, increase technique chill.
13) use high-precision metal mould: Common Difference & Cooperation meet the requirement of Js (deviation=IT12/2) class precision.
embodiment 3
1) stokehold chemical composition is carried out 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 NF EN13835, the nodulizing agent and the nucleating agent that while considering aluminium alloy spheroidizing, use belong to ferro-silicon, can increase the final silicon content of aluminium alloy, for guaranteeing that 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: INOCULIN 390 and 75FeSi, add-on is divided and is 0.5% of fusing weight, and adopts 0.2% INOCULIN 400 of fusing weight as instant inoculation, in casting process, with stream, pours;
3) in charge composition process, select 60% high Ni foundry returns to carry out proportioning, in foundry returns, contain the remaining Mg of 0.04-0.05%;
4) use the nucleating agent (Ca:0.5%-1.5%, Ba:8%-11%) that contains calcium, barium, by comprehensive action, can make this nucleating agent all have good inoculation(effect) in low-sulfur, high-sulfur cast iron;
5) use the nucleating agent (Bi:1.0%) that contains Bi;
7) nodulizing agent selects Mg content at 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 " Sanming City therapy " to process (as embodiment 1):
10) spheroidization treatment temperature of molten iron is selected 1600 ℃～1620 ℃, and teeming temperature is selected 1420 ℃～1460 ℃ and poured into a mould;
11) the thick large flange position of thermal center arranges insulated feeder;
12) at the heat energy-saving position of foundry goods, increase technique chill;
13) use high-precision metal mould: Common Difference & Cooperation meet the requirement of Js (deviation=IT12/2) class precision.
Above-mentioned three embodiment (i.e. three stoves) mechanical property of product and the test data of metallographic structure are as shown in the table:
| Numbering | σb / MPa | σ0. 2 / MPa | δ( %) | HB | Nodularization rate | Matrix |
| 1＃ | 334.4 | 182.6 | 5.0 | 137 | Graphite is excessively cold | The a large amount of L(ledeburites 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 has directly affected the mechanical property of this material, and simultaneously also the mechanical property to this material and metallographic structure have considerable influence for Ni, Si, residual Mg amount.
Nodulizing agent final selected, due to Mg content 6% left and right of ADLLOY6RE nodulizing agent, Mg content is lower, add-on is larger, and it contains higher rare earth, thus select Mg content in 20% left and right the Ni-Mg20 nodulizing agent containing rare earth not, add-on 0.8%.
Selecting of nucleating agent, nucleating agent adopts the INOCULIN of Fushi section 390, and 75FeSi add-on is each 0.5%, and adopts 0.2% Fushi section INOCULIN 400 nucleating agents as instant inoculation, in casting process, with stream, pours.INOCULIN 390, containing very high barium, promotes the formation of a large amount of nucleus, the significant prolongation inoculation fade time in the process breeding; The comprehensive action of calcium, barium makes this nucleating agent all have good inoculation(effect) in low-sulfur, high-sulfur cast iron.INOCULIN 400 is take 75SiFe as basic iron alloy, contains Bi, is suitable for magnesium iron, can significantly improve the number of graphite ball of unit surface, and refinement graphite pebbles improves nodularization rate.
5.1.1, the debug results after process optimization
By the optimization to testing and measuring technology, applicant manufactures experimently continuously and has produced 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 | Nodularization rate | 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 (5)
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 are as follows:
the first step: charge composition
According to stokehold chemical composition requirement, in charge composition, contain: 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%;
In charge composition, select 20% high Ni foundry returns;
second step: fusing
After power transmission melts formation molten bath, add high purity nickel, finally add other alloy;
The Si content of base iron is controlled between 3.4%～3.6%;
the 3rd step: spheroidizing
After aluminium alloy composition detection is qualified, aluminium alloy is poured in spheroidizing bag---carry out spheroidizing;
Nodulizing agent selects Mg content at 18%～20% Ni-Mg alloy;
The spheroidization treatment temperature of molten iron is selected 1600 ℃～1620 ℃;
the 4th step: cast
After spheroidizing finishes, aluminium alloy is transported to cast scene with spheroidizing bag and carries out casting pouring;
During cast, adopt long-acting nucleating agent INOCULIN 390 and 75FeSi, add-on is 0.5% of fusing weight; And adopt 0.2% INOCULIN 400 of fusing weight as instant inoculation, in casting process, with stream, pour;
During cast, use contain calcium Ca:0.5%-1.5%,, the nucleating agent of barium 8%-11%;
Teeming temperature is 1420 ℃～1460 ℃ 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 the 3rd step, adopt " Sanming City therapy " to process, that is, nodulizing agent is first packed in nodularization dykes and dams, after consolidation is paved, again nucleating agent is covered on nodulizing agent, finally with steel plate, cover on nucleating agent, 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 2, is characterized in that: described " Sanming City therapy " processed, nodulizing agent add-on be liquid heavy 0.8%, innoculant adding quantity be liquid heavy 1.2%.
4. 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 the 4th step, in the thick large part of foundry goods, especially, at thick large flange position, is provided with insulated feeder.
5. 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 the 4th step, is provided with technique chill at the heat energy-saving position of foundry goods.
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| CN104818376A (en) * | 2015-05-08 | 2015-08-05 | 柳州金盾机械有限公司 | Tempering process of air exhaust tube of loading machine |
| 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 |
| CN106521297A (en) * | 2016-11-26 | 2017-03-22 | 西峡县西泵特种铸造有限公司 | Method for reducing internal defects of high-nickel austenite ductile iron turbine shell |
| CN111531129A (en) * | 2020-05-07 | 2020-08-14 | 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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