WO2011078500A2 - Ｃｇｉ 주철 및 그 제조방법 - Google Patents

Ｃｇｉ 주철 및 그 제조방법 Download PDF

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Publication number
WO2011078500A2
WO2011078500A2 PCT/KR2010/008730 KR2010008730W WO2011078500A2 WO 2011078500 A2 WO2011078500 A2 WO 2011078500A2 KR 2010008730 W KR2010008730 W KR 2010008730W WO 2011078500 A2 WO2011078500 A2 WO 2011078500A2
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WO
WIPO (PCT)
Prior art keywords
cast iron
magnesium
weight
carbon
present
Prior art date
Application number
PCT/KR2010/008730
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English (en)
French (fr)
Korean (ko)
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WO2011078500A3 (ko
Inventor
양식
심동섭
Original Assignee
두산인프라코어 주식회사
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Priority to EP10839697.9A priority Critical patent/EP2518174B1/en
Priority to CN201080058709.7A priority patent/CN102666896B/zh
Priority to US13/518,516 priority patent/US20120301346A1/en
Publication of WO2011078500A2 publication Critical patent/WO2011078500A2/ko
Publication of WO2011078500A3 publication Critical patent/WO2011078500A3/ko

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    • 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
    • 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
    • C21C1/08—Manufacture of cast-iron
    • 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
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/0006—Adding metallic additives
    • 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

Definitions

  • the present invention relates to cast iron and a method for manufacturing the same, and more particularly, by controlling the content of the components added to the iron, castability is improved, having a stable tensile strength and yield strength and a manufacturing method thereof will be.
  • the cast iron according to the present invention corresponds in particular to hypereutectic compacted graphite iron (CGI) cast iron which is applicable to the cylinder block of a high power diesel engine.
  • CGI hypereutectic compacted graphite iron
  • gray cast iron The material commonly used in conventional cylinder blocks is cast iron, common grade cast iron is usually gray cast iron. Gray cast iron is called gray cast iron because it is gray when the carbon is separated and formed into graphite when cast.
  • cast iron In general, cast iron has a lot of difference depending on the shape, size, and distribution of graphite contained in the matrix. Generally, the cast iron, called cast iron, has a tensile strength of about 15 to 20 kg / mm 2 . Gray cast iron as described above has excellent castability, vibration damping ability, and thermal conductivity, but has a limitation in being used as a cylinder block material of a high explosion pressure engine because of its low strength.
  • Spherical graphite cast iron is a cast iron that has improved the properties of such gray cast iron.
  • Spherical graphite cast iron is cast iron that improves toughness by converting graphite present in ordinary cast iron (gray cast iron) tissues into spherical tissues from the original lobe-like tissues.
  • Such nodular cast iron is also called nodular cast iron or ductile cast iron.
  • the spheroidal graphite cast iron has excellent abrasion resistance, heat resistance, corrosion resistance, and the like, and has a higher elastic modulus than general gray cast iron, has a Brinell hardness of about 200, and is also better than normal cast iron having the same hardness.
  • spherical graphite cast iron has the high strength required by the cylinder block, but lacks castability to make a complicated shape, and has a low thermal conductivity, and thus is limited to be applied to a cylinder block having a complicated shape.
  • CGI composite graphite iron
  • the CGI cast iron precisely increases the content of magnesium (Mg) when tapping a nodular graphite iron melt obtained by melting a nodular cast iron material in a furnace with a ladle, which is a mechanism for transferring a molten metal melted in a furnace to another place. Can be manufactured by controlling.
  • Mg magnesium
  • the present invention has an object to provide a cast iron having a stable physical properties and structure by precisely controlling the amount of magnesium (Mg).
  • Mg magnesium
  • the present invention also aims to establish a chemical composition and manufacturing method capable of producing cast iron for cylinder blocks applicable to high power high horsepower diesel engines having stable tensile strength and yield strength and having appropriate hardness.
  • the present invention is 3.65 to 3.75 wt% of carbon (C), 2.0 to 2.25 wt% of silicon (Si), 0.3 to 0.6 wt% of manganese (Mn), 1.2 to 1.4 wt% of copper (Cu), and tin (Sn). ) 0.07 to 0.10% by weight, magnesium (Mg) 0.008 to 0.018% by weight, phosphorus (P) 0.04% by weight or less, sulfur (S) 0.02% by weight and the remaining amount of iron (Fe) is provided.
  • the tensile strength of the cast iron is in the range of 500 to 600 MPa.
  • the yield strength of the cast iron (Yield Strength) is in the range of 350 to 450Mpa.
  • the Brinell hardness value (BHW) of the cast iron is in the range of 255 to 280.
  • the carbon equivalent (CE: Carbon Equivalent) of the cast iron is in the range of 4.35 to 4.5.
  • the nodularity of graphite formed by carbon in the cast iron may be about 5 to 20%.
  • the present invention also relates to 3.65 to 3.75 wt% of carbon (C), 2.0 to 2.25 wt% of silicon (Si), 0.3 to 0.6 wt% of manganese (Mn), 0.04 wt% or less of phosphorus (P), and sulfur (S). ) Melting the cast iron material containing 0.02% by weight or less and the remaining amount of iron (Fe) in the furnace to produce a cast iron wontang; 1.2 to 1.4 wt% of copper (Cu), 0.07 to 0.10 wt% of tin (Sn), and 0.008 to 0.018 wt% of magnesium (Mg) are placed in a ladle, which is a container for tapping the molten cast iron molten metal in the furnace.
  • C carbon
  • Si silicon
  • Mn manganese
  • P phosphorus
  • S sulfur
  • the prepared cast iron wontang is melted with the ladle disposed by 1.2 to 1.4 wt% of the copper (Cu), 0.07 to 0.10 wt% of tin (Sn), and 0.008 to 0.018 wt% of magnesium (Mg) to prepare a cast iron melt. step; Determining the amount of magnesium to be added by grasping the magnesium content contained in the cast iron melt contained in the ladle; Adding magnesium to the cast iron melt contained in the ladle in an amount of magnesium to be added determined above; And injecting the molten cast iron added with magnesium into a mold.
  • the cast iron molten metal is poured into the ladle to become stable CGI.
  • the graphite is crystallized to obtain CGI cast iron having stable mechanical properties.
  • the carbon equivalent (CE: Carbon Equivalent) in the cast iron wontang is adjusted to be about 4.35 ⁇ 4.5.
  • the tapping temperature of the raw water is adjusted to 1520 ⁇ 10 °C.
  • the magnesium addition step may be inoculated magnesium using a magnesium inoculant in the form of a wire (wire).
  • the cast iron according to the present invention it is possible to predict the spheroidization rate of the graphite contained in the cast iron through the content of magnesium contained in the molten cast iron, it is possible to estimate the range of the strength according to the spheroidization rate.
  • the content of magnesium may vary depending on the strength required, so that the content of magnesium may be 0.008 to 0.018% by weight in order to be applied to a cylinder block of a high power diesel engine.
  • the amount of magnesium (Mg) is precisely controlled, and the amount of copper (Cu) and tin (Sn) is controlled so that tensile strength in the range of 500 to 600 MPa, yield strength in the range of 350 to 450 MPa, and 255 Cast iron having Brinell hardness in the range of from 280 to 280 may be provided.
  • Cast iron according to the present invention has a stable tensile strength and yield strength and has an appropriate hardness, it can be applied to the manufacture of cylinder block applicable to high power high horsepower diesel engine.
  • a CGI cast iron having a homogeneous structure with a high strength enough to be used for cylinder blocks for high horsepower diesel engines by finely controlling the amount of magnesium (Mg).
  • Mg magnesium
  • Cu copper
  • Sn tin
  • 1 is a graph illustrating the relationship between magnesium (Mg) content and the spheroidization rate of graphite.
  • FIG. 2 is a graph illustrating the relationship between the spheroidization rate of graphite, tensile strength, and yield strength.
  • Figure 3 is a diagram showing the relationship between magnesium (Mg) content and tensile strength and the appearance of the representative structure of cast iron.
  • Mg magnesium
  • 1 MPa corresponds to 1 N / mm 2 .
  • Figure 4 briefly shows an example of the manufacturing process of cast iron according to the present invention.
  • Cast iron according to the present invention is 3.65 to 3.75% by weight of carbon (C), 2.0 to 2.25% by weight of silicon (Si), 0.3 to 0.6% by weight of manganese (Mn), 1.2 to 1.4% by weight of copper (Cu), 0.07-0.10 weight percent tin (Sn) and 0.008-0.18 weight percent magnesium (Mg); Phosphorus (P) comprises up to 0.04% by weight and sulfur (S) comprises up to 0.02% by weight; It contains the balance of iron (Fe).
  • Cast iron of the present invention is based on iron (Fe),
  • Carbon is added for crystallization of compacted graphite.
  • the carbon content is less than 3.65 wt%, the chilling behavior is observed in the thin-walled part, and 3.75 wt% Exceeding% causes graphite spheroidization shrinkage and poor flow. Therefore, in order to prevent such a defect in a high-strength cylinder block having a variety of thickness in the present invention, the content of carbon is limited to 3.65 ⁇ 3.75% by weight.
  • Silicon when added in the optimum ratio with carbon, maximizes the amount of compacted graphite and increases the strength of cast iron.
  • the silicon content is less than 2.0% by weight, the problem of lowering the amount of reinforced graphite crystals occurs, and if the content exceeds 2.25% by weight, the ductility is lowered, so that the content is 2.0 to 2.25% by weight. Set it.
  • Manganese is added for the refinement of graphite and stabilization of pearlite.
  • the content of manganese is less than 0.3% by weight, the hardness decreases, and when it exceeds 0.6% by weight, brittleness increases, so that the content of 0.3 ⁇ Set to 0.6% by weight.
  • Copper is an element for strengthening graphite, and is an element necessary for securing strength because it serves to promote and refine pearlite production.
  • the content of copper is set to 1.2 to 1.4% by weight.
  • Tin is a very powerful pearlite production promoting element and, like copper, is added for the purpose of improving strength.
  • the content of tin is less than 0.07% by weight, a decrease in strength is caused, and when it is added in excess of 0.10% by weight, brittleness is rapidly increased, so the content is set to 0.07 to 0.10% by weight. do.
  • the graphite when the magnesium content is less than 0.008% by weight, the graphite is flattened, and when the content of magnesium is more than 0.018% by weight, the spheroidization rate of the graphite is increased to cause shrinkage, so that the content is 0.008 to 0.018% by weight. It is limited to a range.
  • Phosphorus is also a kind of impurities that are naturally added in the manufacturing process of cast iron in the air. This phosphorus also serves to stabilize the pearlite, but when the content exceeds 0.04% by weight, brittleness increases rapidly, which is associated with shrinkage defects due to segregation. Therefore, in the cast iron according to the present invention, it is preferable to manage the phosphorus content to be 0.04% by weight or less.
  • Sulfur acts as a source of compacted graphite, but when the content exceeds 0.02% by weight, the addition of more magnesium is required for the production of reinforced graphite. That is, if the content of sulfur in the magnesium content is limited to more than a certain range, the problem that the graphite is compacted (compacted graphite) occurs. Therefore, in the cast iron according to the present invention, the content of sulfur should be controlled to 0.02% by weight or less.
  • Iron is the main body of cast iron according to the invention.
  • the remaining component other than the above components is iron.
  • the carbon equivalent is set to 4.35 to 4.5.
  • the carbon equivalent (CE) is defined as carbon + (silicon +) X 1/3, the value can be adjusted to control the properties and quality of the product.
  • the tensile strength of the cast iron is 500 ⁇ 600MPa
  • yield strength is 350 ⁇ 450MPa.
  • the nodularity rate of the graphite formed by the carbon is 5 to 20%.
  • the carbon (C) 3.65 ⁇ 3.75% by weight, silicon (Si) 2.0 ⁇ 2.25% by weight, manganese (Mn) 0.3 ⁇ 0.6% by weight, phosphorus (P)
  • the cast iron material containing more than 0 and less than 0.04% by weight, sulfur (S) is more than 0 and less than 0.02% by weight and the remaining amount of iron (Fe) in the furnace 100 to prepare a cast iron melt 110 molten metal.
  • the produced cast iron melt bath was melted with the ladle 200 disposed by 1.2 to 1.4 wt% of copper (Cu), 0.07 to 0.10 wt% of tin (Sn), and 0.008 to 0.018 wt% of magnesium (Mg).
  • the melt 110 is prepared.
  • the tapping temperature may be adjusted to be 1520 ⁇ 10 ° C.
  • the carbon equivalent (CE: Carbon Equivalent) in the cast iron wontang can be adjusted to be 4.35 ⁇ 4.5.
  • the amount of magnesium to be added is determined by grasping the magnesium content contained in the molten cast iron contained in the ladle 200.
  • the molten cast iron contained in the ladle contains a predetermined amount of magnesium. Nevertheless, in order to take into account the loss of magnesium during ladle transfer and to control the magnesium content more precisely, once again the magnesium content contained in the molten cast iron contained in the ladle is again determined, and when it is determined that addition of magnesium is necessary, Add magnesium.
  • the thermal analyzer 300 may be used to determine the magnesium content.
  • the amount of magnesium to be added determined above is added to the cast iron melt contained in the ladle. According to an example of the present invention, magnesium may be added using magnesium 500 in the form of wire.
  • inoculants commonly used in the manufacture of cast iron may be added.
  • silicone based inoculants may be further added.
  • the silicone-based inoculant may be purchased commercially available. The type and content of the inoculant can be easily selected and determined by those skilled in the art as needed.
  • the other inoculants may also be wire 500.
  • the molten solution to which magnesium is added is injected into the mold 400 to complete cast iron.
  • a raw water containing carbon (C), silicon (Si), manganese (Mn), phosphorus (P) was prepared.
  • Sulfur (S) is an element that is inevitably included in the manufacturing raw material and manufacturing process of cast iron, but not added separately, but the content is less than 0.02% by weight.
  • a carbon equivalent (CE) was measured using a CE meter to adjust the content of carbon, and the raw water was prepared by adjusting it to 1,146 ⁇ 1 ° C based on TL (liquid line temperature).
  • Ladle was prepared by adding magnesium (Mg), copper (Cu) and tin (Sn), and the raw water was tapped into the ladle while maintaining the tapping temperature uniformly around about 1,520 ° C.
  • the amount of magnesium to be added was determined by thermal analysis of the tapping hot water in consideration of the amount of magnesium to be finally included, and magnesium in the form of a wire was adjusted in the mold at 1,410 ⁇ 10 ° C.
  • the carbon equivalent (C.E.), tensile strength (TS), yield strength (YS), hardness (Hardness) and nodularity of the cast iron prepared according to the composition of Table 1 were measured and shown in Table 2.
  • Hardness here is Brinell hardness, and HBW Brinell hardness value.
  • Example 1 4.410 514.0 422.0 267.3 17.8
  • Example 2 4.420 521.0 342.5 259.5 8.5
  • Example 3 4.410 537.0 418.5 260.5 7.5
  • Example 4 4.410 550.8 418.8 273.3 11.6
  • Example 5 4.400 562.5 424.5 265.0 18.0
  • Example 6 4.420 570.0 434.0 271.3 19.9
  • Example 7 4.430 576.3 427.3 261.8 18.2
  • Example 8 4.380 579.5 441.8 279.0 14.4
  • Example 9 4.430 584.0 430.8 272.5 18.3
  • Example 10 4.420 584.8 438.3 269.0 21.1 Comparative Example 1 4.560 356.3 371.0 261.5 9.2 Comparative Example 2 4.410 412.5 345.8 244.3 17.5
  • Comparative Example 5 4.460 481.0 390.0 248.0 Not measurable Comparative Example 6 4.370 60
  • cast iron according to an embodiment of the present invention has a tensile strength in the range of 500 to 600 MPa (N / mm 2 ), and yield strength of 350 to 450 MPa (N / mm 2). It can be seen that the HBW Brinell hardness value is in the range of 255 to 280.
  • the cast iron according to the present invention has stable tensile strength and yield strength and has an appropriate hardness, and thus can be easily applied to the manufacture of a cylinder block applicable to a high power high horsepower diesel engine.
  • the results of observing the relationship between the spheroidization rate and magnesium content of the cast iron is shown in FIG.
  • the sphericity ratio was found to be in the range of 5 to 20%.
  • the relationship between the tensile strength and yield strength according to the spheroidization rate of the CGI cast iron prepared above may be referred to FIGS. 2 and 3.
  • the tensile strength and the yield strength can be cast iron in the range of 500 ⁇ 600MPa and 350 ⁇ 450Mpa, respectively, to have a good quality.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
PCT/KR2010/008730 2009-12-22 2010-12-08 Ｃｇｉ 주철 및 그 제조방법 WO2011078500A2 (ko)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP10839697.9A EP2518174B1 (en) 2009-12-22 2010-12-08 Cgi cast iron and a production method for the same
CN201080058709.7A CN102666896B (zh) 2009-12-22 2010-12-08 适用于高输出功率的柴油发动机的气缸体的cgi铸铁及其制造方法
US13/518,516 US20120301346A1 (en) 2009-12-22 2010-12-08 Cgi cast iron and production method for the same

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR10-2009-0128817 2009-12-22
KR1020090128817A KR101605905B1 (ko) 2009-12-22 2009-12-22 Ｃｇｉ 주철 및 그 제조방법

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WO2011078500A2 true WO2011078500A2 (ko) 2011-06-30
WO2011078500A3 WO2011078500A3 (ko) 2011-11-10

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US (1) US20120301346A1 (zh)
EP (1) EP2518174B1 (zh)
KR (1) KR101605905B1 (zh)
CN (2) CN102666896B (zh)
WO (1) WO2011078500A2 (zh)

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EP2785882B1 (en) * 2011-11-30 2016-01-20 Federal-Mogul Corporation High modulus wear resistant gray cast iron for piston ring applications
CN103195689A (zh) * 2013-04-24 2013-07-10 东莞市金瑞五金制品有限公司 一种压缩机
KR102279874B1 (ko) * 2014-12-24 2021-07-20 두산인프라코어 주식회사 구상 흑연 주철 및 이의 제조방법, 이로부터 제조된 유압기기용 부품
KR102388131B1 (ko) * 2015-02-04 2022-04-19 현대두산인프라코어(주) 컴팩트 흑연 주철 및 이를 포함하는 엔진 부품
WO2018079887A1 (ko) * 2016-10-28 2018-05-03 한국생산기술연구원 편상 흑연 주철 및 주물과 그 제조방법
CN112322962B (zh) * 2020-11-06 2022-04-12 中原内配集团股份有限公司 一种蠕墨铸铁及其制备方法
CN114836680A (zh) * 2021-02-01 2022-08-02 上海海立电器有限公司 铸件材料、压缩机气缸及其铸造方法、转子式压缩机

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Also Published As

Publication number Publication date
CN102666896A (zh) 2012-09-12
KR20110072048A (ko) 2011-06-29
US20120301346A1 (en) 2012-11-29
CN103938067A (zh) 2014-07-23
CN103938067B (zh) 2017-07-28
KR101605905B1 (ko) 2016-03-23
EP2518174A2 (en) 2012-10-31
EP2518174B1 (en) 2015-07-22
EP2518174A4 (en) 2014-05-07
CN102666896B (zh) 2014-10-29
WO2011078500A3 (ko) 2011-11-10

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