CN114182055A - Production method of nodular iron casting and nodular iron casting prepared by adopting method - Google Patents
Production method of nodular iron casting and nodular iron casting prepared by adopting method Download PDFInfo
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- CN114182055A CN114182055A CN202111519466.9A CN202111519466A CN114182055A CN 114182055 A CN114182055 A CN 114182055A CN 202111519466 A CN202111519466 A CN 202111519466A CN 114182055 A CN114182055 A CN 114182055A
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- iron
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- 238000005266 casting Methods 0.000 title claims abstract description 66
- 229910001141 Ductile iron Inorganic materials 0.000 title claims abstract description 53
- 238000000034 method Methods 0.000 title claims abstract description 48
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 24
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 54
- 238000011081 inoculation Methods 0.000 claims abstract description 38
- 239000002054 inoculum Substances 0.000 claims abstract description 38
- 229910052742 iron Inorganic materials 0.000 claims abstract description 27
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 14
- 238000003723 Smelting Methods 0.000 claims abstract description 13
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 13
- 239000010959 steel Substances 0.000 claims abstract description 13
- 239000000463 material Substances 0.000 claims abstract description 9
- 239000004615 ingredient Substances 0.000 claims abstract description 4
- 238000010079 rubber tapping Methods 0.000 claims abstract description 4
- 238000010438 heat treatment Methods 0.000 claims description 20
- 229910000519 Ferrosilicon Inorganic materials 0.000 claims description 7
- NCJRLCWABWKAGX-UHFFFAOYSA-N [Si].[Ca].[Ba] Chemical group [Si].[Ca].[Ba] NCJRLCWABWKAGX-UHFFFAOYSA-N 0.000 claims description 5
- 229910000805 Pig iron Inorganic materials 0.000 claims description 4
- 238000002360 preparation method Methods 0.000 claims description 3
- 239000002245 particle Substances 0.000 claims description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 6
- 230000000694 effects Effects 0.000 abstract description 4
- 229910002804 graphite Inorganic materials 0.000 abstract description 4
- 239000010439 graphite Substances 0.000 abstract description 4
- 238000007689 inspection Methods 0.000 abstract description 3
- 239000007788 liquid Substances 0.000 abstract description 3
- 230000002035 prolonged effect Effects 0.000 abstract description 3
- 238000012797 qualification Methods 0.000 abstract description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000005275 alloying Methods 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000004321 preservation Methods 0.000 description 2
- 239000010936 titanium Substances 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910052788 barium Inorganic materials 0.000 description 1
- DSAJWYNOEDNPEQ-UHFFFAOYSA-N barium atom Chemical compound [Ba] DSAJWYNOEDNPEQ-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052755 nonmetal Inorganic materials 0.000 description 1
- 229910001562 pearlite Inorganic materials 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 229910052702 rhenium Inorganic materials 0.000 description 1
- WUAPFZMCVAUBPE-UHFFFAOYSA-N rhenium atom Chemical compound [Re] WUAPFZMCVAUBPE-UHFFFAOYSA-N 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
Images
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
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D5/00—Heat treatments of cast-iron
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/08—Making cast-iron alloys
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/08—Making cast-iron alloys
- C22C33/10—Making cast-iron alloys including procedures for adding magnesium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C37/00—Cast-iron alloys
- C22C37/04—Cast-iron alloys containing spheroidal graphite
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C37/00—Cast-iron alloys
- C22C37/10—Cast-iron alloys containing aluminium or silicon
-
- 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
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
The invention discloses a production method of nodular iron castings and the nodular iron castings prepared by the method, wherein the production method comprises a material mixing process; mixing scrap steel, nodular cast iron, a recarburizing agent and a nodulizing agent according to a certain proportion; a smelting process; adding the mixed ingredients into a smelting furnace for smelting to obtain molten iron; tapping molten iron and inoculating; adding a first inoculant for inoculation when molten iron is discharged from a furnace; spheroidizing inoculation process; adding a second inoculant into the spheroidizing process for inoculation; and a casting process, wherein a third inoculant is added in the casting process for casting stream inoculation. The effective time of the full-time pouring inoculation is prolonged. The quantity of graphite nodule distortion in a metallographic structure is reduced, the inoculation effect of the ladle tail casting iron liquid at the last stage of pouring is fully ensured, the mechanical property and the metallographic structure consistency of the whole ladle poured casting are improved, and the mechanical property and the metallographic structure qualification rate of the ductile iron casting made of a high-toughness material and the ladle tail inspection test block reach more than 95%.
Description
Technical Field
The invention relates to the technical field of nodular cast iron, in particular to a production method of a nodular cast iron piece and the nodular cast iron piece prepared by the method.
Background
The inoculation treatment process of the nodular cast iron in the prior casting production generally adopts a double inoculation treatment process of wire feeding spheroidization and inoculation at the same time and stream inoculation during pouring. The double inoculation process is a relatively mature inoculation process in the current nodular cast iron production field, so that the production process parameters are reasonably controlled to meet the requirements of the metallographic structure of the product material.
However, when cast-state high-performance and high-toughness nodular iron castings such as QT400-15/18, QT500-7 or QT600-7 are produced, the contents of metal and non-metal elements influencing spheroidization in cast pig iron, particularly the content of metallic titanium (Ti), are not effectively controlled, the content is higher, and the pouring time is longer. When the test block is taken from the tail of the ladle, the elongation (A%) of the toughness index of the casting is obviously reduced, and the elongation of the casting is unqualified in severe cases. In addition, the effective pouring time of inoculation is not prolonged, so that the inoculation of the casting is declined in the later pouring period, and the distortion number of graphite nodules is large.
Disclosure of Invention
Therefore, the invention provides a production method of a nodular iron casting and the nodular iron prepared by the method, which aim to solve at least one problem in the prior art.
In order to achieve the above purpose, the invention provides the following technical scheme:
according to the present invention, there is provided a method for producing a ductile iron casting, characterized by comprising:
a material preparation process; mixing scrap steel, nodular cast iron, a recarburizing agent and a nodulizing agent according to a certain proportion;
a smelting process; adding the mixed ingredients into a smelting furnace for smelting to obtain molten iron; tapping molten iron and inoculating; adding a first inoculant for inoculation when molten iron is discharged from a furnace;
spheroidizing inoculation process; adding a second inoculant into the spheroidizing process for inoculation;
a casting process; and adding a third inoculant in the pouring process for pouring stream inoculation.
Furthermore, the production method of the nodular iron casting also comprises a heat treatment process, wherein the cast is subjected to heat treatment.
Further, the weight ratio of the scrap steel, the nodular cast iron, the recarburizing agent and the nodulizing agent is 10-20: 50-68: 10-45: 17-25.
Further, the first inoculant is ferrosilicon, and the weight ratio of the first inoculant to the molten iron is 0.1-0.9%.
Further, the second inoculant is 75# ferrosilicon, and the weight ratio of the second inoculant to the molten iron is 0.2-0.5%.
Further, the third inoculant is silicon-calcium-barium, and the weight ratio of the silicon-calcium-barium to the molten iron is 1% -3%.
Further, the particle size of the first inoculant is 0.8-3 mm.
Further, in the heat treatment step, the heat treatment temperature is 620 ℃.
Further, the casting temperature in the casting step is 1300 ℃ to 1325 ℃.
The invention also discloses a nodular iron casting which is prepared by the production method of the nodular iron casting.
The invention has the following advantages:
the production method of the nodular iron casting adopts a triple inoculation treatment process, adds an inoculation procedure, and prolongs the effective time of full-time pouring inoculation. The quantity of graphite nodule distortion in a metallographic structure is reduced, the inoculation effect of the ladle tail casting iron liquid at the last stage of pouring is fully ensured, the mechanical property and the metallographic structure consistency of the whole ladle poured casting are improved, and the mechanical property and the metallographic structure qualification rate of the ductile iron casting made of a high-toughness material and the ladle tail inspection test block reach more than 95%.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It should be apparent that the drawings in the following description are merely exemplary, and that other embodiments can be derived from the drawings provided by those of ordinary skill in the art without inventive effort.
The structures, ratios, sizes, and the like shown in the present specification are only used for matching with the contents disclosed in the specification, so as to be understood and read by those skilled in the art, and are not used to limit the conditions that the present invention can be implemented, so that the present invention has no technical significance, and any structural modifications, changes in the ratio relationship, or adjustments of the sizes, without affecting the effects and the achievable by the present invention, should still fall within the range that the technical contents disclosed in the present invention can cover.
Fig. 1 is a flow diagram illustrating a method for producing ductile iron castings according to an exemplary embodiment.
Detailed Description
The present invention is described in terms of particular embodiments, other advantages and features of the invention will become apparent to those skilled in the art from the following disclosure, and it is to be understood that the described embodiments are merely exemplary of the invention and that it is not intended to limit the invention to the particular embodiments disclosed. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
According to an embodiment of the present invention, there is provided a method of producing a ductile iron casting, as shown in fig. 1, including:
a material preparation process;
s11, mixing the scrap steel, the nodular cast iron, the recarburizing agent and the nodulizing agent according to a certain proportion;
a smelting process;
s12, adding the mixed ingredients into a smelting furnace for smelting to obtain molten iron;
tapping molten iron and inoculating;
s13, adding a first inoculant for inoculation when molten iron is discharged from a furnace;
spheroidizing inoculation process;
s14, adding a second inoculant in the spheroidizing process for inoculation;
a casting process;
and S15, adding a third inoculant in the pouring process to perform pouring stream inoculation.
The production method of the nodular iron casting adopts a triple inoculation treatment process, and compared with a double inoculation treatment process in the prior art, the production method increases an inoculation procedure, and prolongs the effective time of full-time pouring inoculation. The quantity of graphite nodule distortion in a metallographic structure is reduced, the inoculation effect of the ladle tail casting iron liquid at the last stage of pouring is fully ensured, the mechanical property and the metallographic structure consistency of the whole ladle poured casting are improved, and the mechanical property and the metallographic structure qualification rate of the ductile iron casting made of a high-toughness material and the ladle tail inspection test block reach more than 95%.
The production method of the nodular iron casting also comprises a heat treatment process, wherein the heat treatment process is carried out on the cast after pouring. And (4) refining and homogenizing the structure of the cast through a heat treatment process. In the heat treatment process, the heat treatment temperature is 620 ℃, the heat treatment time is in direct proportion to the thickness of the casting, and for example, when the thickness of the casting is 3 mm, the heat treatment time is about 1 hour.
The weight ratio of the scrap steel, the nodular cast iron, the recarburizing agent and the nodulizing agent is 10-20: 50-68: 10-45: 17-25. The scrap steel, the nodular cast iron, the recarburizer and the nodulizer can be prepared by adopting raw materials in the prior art, wherein the scrap steel, the nodular cast iron, the recarburizer and the nodulizer can simultaneously enter a smelting furnace and then are uniformly stirred.
The first inoculant is ferrosilicon, and the weight ratio of the first inoculant to the molten iron is 0.1-0.9%. The inoculation time is proportional to the weight, and for example, if the weight of the first inoculant is 30 grams, the whole inoculant can be added into the molten iron within 1 minute. The granularity of the first inoculant is 0.8-3 mm, and the first inoculant can be conveniently blended into molten iron.
The second inoculant is 75# ferrosilicon, and the weight ratio of the second inoculant to the molten iron is 0.2-0.5%. Wherein, by adding 75 ferrosilicon, the carbon content in the nodular iron casting can be reduced, and the impact toughness of the nodular iron casting is improved.
The third inoculant is silicon-calcium-barium, and the weight ratio of the silicon-calcium-barium inoculant to the molten iron is 1-3%. By adding alloying elements, the crystal grains of the product can be refined, and the performance of the product can be improved.
Through the triple inoculation process, the treatment by adopting a micro-alloying technology can be realized, and the alloy for promoting the formation of pearlite is added into the molten iron, so that the mechanical property of the nodular iron casting is improved. The effective pouring time after the production inoculation treatment of the nodular iron castings can be prolonged. The metallographic structure of the full pouring time period is balanced and optimized. The metallurgical structure and the mechanical property of the high-toughness grade ductile iron, particularly the percent of pass of elongation (A/%) are effectively improved.
The casting temperature in the casting process is 1300-1325 ℃.
The invention also discloses a nodular iron casting which is prepared by the production method of the nodular iron casting.
The ductile iron casting prepared by the process has the advantages that the plasticity and the toughness of the material casting are obviously improved, and the elongation is greatly improved.
The properties of ductile iron castings are illustrated experimentally below.
Example 1
Taking QT400 as an example, scrap steel, nodular cast iron, a recarburizer and a nodulizer are mixed according to a certain ratio, wherein the weight of the scrap steel is 0.9 ton, the weight of the nodular cast iron is 5 ton, the weight of the recarburizer is 2.2 ton, the weight of the nodulizer is 2 ton, the weight of the first inoculant is 0.03 ton, the weight of the second inoculant is 0.03 ton, and the weight of the third inoculant is 0.2 ton.
The casting temperature was 1310 degrees celsius.
The temperature of the heat treatment is 620 ℃, the heat preservation time of the heat treatment is 1.5 hours, and the heating rate and the cooling rate are carried out by adopting the parameters in the prior art.
The nodular iron casting obtained by the method comprises 3.8% of carbon, 2.7% of silicon, 0.4% of manganese, 0.8% of magnesium, 4% of rhenium, 1% of calcium and 1% of barium.
The room temperature tensile strength is 550MPa, the room temperature impact performance is 100 joules, the elongation is 30 percent, and compared with the room temperature tensile strength of 440MPa and the elongation of 20 percent in the prior art, the method has remarkable improvement.
Example 2
Taking QT500 as an example, scrap steel, nodular pig iron, a carburant and a nodulizer are mixed according to a certain proportion, wherein the weight of the scrap steel is 1.5 tons, the weight of the nodular pig iron is 8 tons, the weight of the carburant is 3 tons, the weight of the nodulizer is 2.5 tons, the weight of a first inoculant is 0.02 ton, the weight of a second inoculant is 0.035 ton, and the weight of a third inoculant is 0.2 ton.
The casting temperature was 1310 degrees celsius.
The temperature of the heat treatment is 620 ℃, the heat preservation time of the heat treatment is 1.5 hours, and the heating rate and the cooling rate are carried out by adopting the parameters in the prior art.
The room temperature tensile strength is 640MPa, the room temperature impact performance is 120J, the elongation is 35%, and compared with the room temperature tensile strength of 520MPa and the elongation of 24% in the prior art, the method has remarkable improvement.
Although the invention has been described in detail above with reference to a general description and specific examples, it will be apparent to one skilled in the art that modifications or improvements may be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.
Claims (10)
1. A method of producing ductile iron castings, comprising:
a material preparation process; mixing scrap steel, nodular cast iron, a recarburizing agent and a nodulizing agent according to a certain proportion;
a smelting process; adding the mixed ingredients into a smelting furnace for smelting to obtain molten iron;
tapping molten iron and inoculating; adding a first inoculant for inoculation when molten iron is discharged from a furnace;
spheroidizing inoculation process; adding a second inoculant into the spheroidizing process for inoculation;
and in the casting process, a third inoculant is added in the casting process for casting stream inoculation.
2. The method for producing ductile iron castings according to claim 1, further comprising a heat treatment process for heat-treating the cast castings after pouring.
3. The method for producing the ductile iron casting according to claim 1, wherein the weight ratio of the scrap steel, the ductile pig iron, the recarburizing agent and the nodulizing agent is 10-20: 50-68: 10-45: 17-25.
4. The method of claim 1, wherein the first inoculant is ferrosilicon in a ratio of 0.1-0.9 wt% based on the weight of molten iron.
5. The method as claimed in claim 1, wherein said second inoculant is ferrosilicon 75 in a ratio of 0.2-0.5% by weight to the weight of the molten iron.
6. The method as claimed in claim 1, wherein said third inoculant is silicon calcium barium in a ratio of 1-3% by weight of iron melt.
7. The method of claim 1, wherein the first inoculant has a particle size of 0.8-3 mm.
8. The method for manufacturing ductile iron castings according to claim 2, wherein the heat treatment temperature in the heat treatment process is 620 degrees celsius.
9. The method for producing ductile iron castings according to claim 1, wherein the casting temperature in the casting process is 1300 ℃ to 1325 ℃.
10. A ductile iron casting characterized by being produced by the method for producing a ductile iron casting according to any one of claims 1 to 9.
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| CN202111519466.9A CN114182055A (en) | 2021-12-13 | 2021-12-13 | Production method of nodular iron casting and nodular iron casting prepared by adopting method |
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| CN202111519466.9A CN114182055A (en) | 2021-12-13 | 2021-12-13 | Production method of nodular iron casting and nodular iron casting prepared by adopting method |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20140271330A1 (en) * | 2011-10-07 | 2014-09-18 | Akebono Brake Industry Co., Ltd. | Method for producing spheroidal graphite cast iron and vehicle component using said spheroidal graphite cast iron |
| CN104152793A (en) * | 2014-08-29 | 2014-11-19 | 荆州市巨鲸传动机械有限公司 | Method for controlling mass and composition of QT500-7 thick walled casting |
| US20140348694A1 (en) * | 2011-12-22 | 2014-11-27 | Akebono Brake Industry Co., Ltd | Process for producing spheroidal-graphite cast iron, and spheroidal-graphite cast iron member obtained from said spheroidal-graphite cast iron |
| CN105886692A (en) * | 2016-04-22 | 2016-08-24 | 锦州捷通铁路机械制造有限公司 | Production technology of - 70 DEG C ultra-low temperature and high tenacity ductile cast iron |
| CN110578084A (en) * | 2019-10-19 | 2019-12-17 | 锦州捷通铁路机械股份有限公司 | Production process of as-cast full-ferrite nodular cast iron material |
-
2021
- 2021-12-13 CN CN202111519466.9A patent/CN114182055A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20140271330A1 (en) * | 2011-10-07 | 2014-09-18 | Akebono Brake Industry Co., Ltd. | Method for producing spheroidal graphite cast iron and vehicle component using said spheroidal graphite cast iron |
| US20140348694A1 (en) * | 2011-12-22 | 2014-11-27 | Akebono Brake Industry Co., Ltd | Process for producing spheroidal-graphite cast iron, and spheroidal-graphite cast iron member obtained from said spheroidal-graphite cast iron |
| CN104152793A (en) * | 2014-08-29 | 2014-11-19 | 荆州市巨鲸传动机械有限公司 | Method for controlling mass and composition of QT500-7 thick walled casting |
| CN105886692A (en) * | 2016-04-22 | 2016-08-24 | 锦州捷通铁路机械制造有限公司 | Production technology of - 70 DEG C ultra-low temperature and high tenacity ductile cast iron |
| CN110578084A (en) * | 2019-10-19 | 2019-12-17 | 锦州捷通铁路机械股份有限公司 | Production process of as-cast full-ferrite nodular cast iron material |
Non-Patent Citations (1)
| Title |
|---|
| 肖连华: "球墨铸铁轧辊的球化孕育处理分析与应用", 《现代铸铁》 * |
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