WO2001044530A1 - New alloy and method for producing same - Google Patents
New alloy and method for producing same Download PDFInfo
- Publication number
- WO2001044530A1 WO2001044530A1 PCT/SE2000/002550 SE0002550W WO0144530A1 WO 2001044530 A1 WO2001044530 A1 WO 2001044530A1 SE 0002550 W SE0002550 W SE 0002550W WO 0144530 A1 WO0144530 A1 WO 0144530A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- cast iron
- magnesium
- inclusions
- alloy according
- sulfide
- Prior art date
Links
Classifications
-
- 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
- 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
- C21C1/00—Refining of pig-iron; Cast iron
- C21C1/10—Making spheroidal graphite 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
- 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
-
- 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
Definitions
- the present invention relates to a novel magnesium-treated cast iron containing inclusions, preferably manganese sulfide (MnS) or molybdenium sulfide (MoS 2 ) inclusions.
- the invention also relates to a procedure for preparing the novel cast iron, cast iron products comprising the novel cast iron, as well as using the novel iron for manufacturing cylinder blocks, cylinder heads, bedplates, transmission housings, axle housings or brake drums and discs.
- Magnesium treated cast irons such as compacted graphite iron (CGI) and ductile cast iron (SG) are widely used for a variety of applications. Unfortunately, however, in comparison to conventional grey cast iron these alloys are relatively difficult to machine. This factor has prevented their application to many high volume products which require large amounts of machining.
- CGI compacted graphite iron
- SG ductile cast iron
- CGI and SG Although the higher strength, stiffness and ductility of CGI and SG relative to conventional grey cast irons accounts for much the difference in machinability between these materials, other factors may also be active.
- One such factor is the presence of 1-5 ⁇ m diameter manganese sulfide (MnS) inclusions in grey cast iron. These inclusions are known to adhere to the cutting edge of the machining tools, thus forming a protective layer and reducing tool wear. The effect is particularly significant at high cutting speeds (400-1 000 m/min) when using cubic boron nitride (CBN) or ceramic cutting materials. It is also known that high sulfur and manganese additions improve the machinability of steels. Such steel alloys are referred to in the trade as "free-machining steels".
- the mechanism for improved machinability relates to the formation of a protective MnS layer on the cutting insert and/or a lubricating effect of the sulfide inclusions between the cutting insert and the workpiece and/or chip.
- manganese sulfide inclusions are not stable in magnesium-treated cast irons due to the lower free-energy of magnesium sulfide at ironmaking temperatures ( Figure 1). Therefore, a previous patent (SE 9800750-3), incorporated by reference, disclosed a method to convert the existing MgO.Si0 2 inclusions in magnesium-treated cast irons to soft calcium-bearing inclusions.
- MnS and MoS 2 are not stable in the presence of magnesium.
- said cast iron can also be formed by adding said sulfides directly to the iron after the magnesium reaction has taken place and an in situ equilibrium has been established between magnesium , oxygen and sulfur. Another option is to begin with a sulfur content in excess of the stoichiometric amount required to combine with the added magnesium, thus ensureing an amount of left-over sulfur to promote the formation of the desired sulfide inclusions.
- inclusion-fo ⁇ ning compound generally relates to all non-metallic non-organic compounds with hexagonal or face-centred cubic crystal structures and melting points of at least 1100 °C.
- manganese sulfide or molybdenium sulfide is used in relation to the present invention.
- the present invention relates to a magnesium-treated cast iron containing inclusions which either lubricate the cutting insert or contribute to the formation of a protective layer on the cutting edge of the insert.
- the inclusions preferably consist of manganese sulfide (MnS) or molybdenium sulfide (MoS 2 ).
- the sulfides are added to a molten base iron as 1 - 100 ⁇ m particles. In the presence of heat (1400 - 1500 °C), these particles will become individual spheroids with a uniformly distributed by the convection currents present in the molten iron.
- This base iron is then treated with magnesium at the last possible moment, preferably when the molten cast iron has been poured into a mould.
- the present invention will be disclosed with reference to the enclosed figure 1 which shows temperature dependencies of free precipitation energies ⁇ G S ° for some oxides, sulfides, oxysulfides, nitrides and carbides in molten iron.
- reaction [1] proceeds rapidly to the right. It is therefore important to delay reaction [1] until the last possible moment to prevent reduction of the desired MnS inclusions.
- the magnesium addition be made as late as possible, preferably just before the iron is dispensed into the mould or in-the-mould itself.
- the present invention requires that the molten cast iron is not treated with magnesium until the last possible moment before casting.
- the magnesium can be added immediately before dispensing the molten iron into the mould, but preferably the magnesium is added to the melt after dispensing the molten iron into the mould.
- the amount of magnesium added in this step is calibrated in advance. Typically the magnesium content of the final cast iron melt is 0.001 - 0.030% (wt).
- MnS particles or other known solid lubricant particles, such as MoS 2
- a post-addition of MnS particles, or other known solid lubricant particles, such as MoS 2 may be made to the iron after the magnesium reaction has taken place and an in-situ equilibrium has been established between magnesium, oxygen and sulfur. This will allow the MnS or MoS 2 particles to remain in the solidified casting.
- 1 - 100 ⁇ m manganese sulfide particles of are added.
- the addition of these particles result in an amount of manganese in the final melt of at least 0.1 % (wt), and typically about 0.6 %.
- An amount of of about 4 kg manganese sulfide per tonne molten cast iron is typically added, corresponding to
- a proposed composition for such a master alloy for adding either MnS or MoS 2 particles is as follows:
- this alternative method comprises the steps of a) preparing a molten base iron according toper se known methods; b) adding a predetermined amount of magnesium to the molten base iron and allowing establishment of an equilibrium between magnesium, oxygen and sulfur; c) adding a predetermined amount of manganese sulfide and/or molybdenium sulfide; and finally d) casting the melt according to per se known methods.
- a final option for the stabilisation of MnS in the standard CGI or SG base iron is to increase the sulfur content beyond the typical level of 0.005 - 0.020 % S. In this way , the higher amount of sulfur increases the probability that MnS will form, and indeed survive until the moment of solidification. Thus, the presence of 0.04 % sulfur or more, in the CGI or SG base iron has been shown to result in the presence of MnS inclusions in the final cast products, thus improving their machinability.
Landscapes
- 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)
- Treatment Of Steel In Its Molten State (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
Description
Claims
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE60003952T DE60003952T2 (en) | 1999-12-17 | 2000-12-15 | NEW ALLOY AND PRODUCTION METHOD THEREFOR |
KR1020027007747A KR20020062761A (en) | 1999-12-17 | 2000-12-15 | New alloy and method for producing same |
US10/149,653 US7081151B2 (en) | 1999-12-17 | 2000-12-15 | Alloy and method for producing same |
JP2001545607A JP2003517099A (en) | 1999-12-17 | 2000-12-15 | Novel alloy and its manufacturing method |
AU25639/01A AU2563901A (en) | 1999-12-17 | 2000-12-15 | New alloy and method for producing same |
EP00989092A EP1252353B1 (en) | 1999-12-17 | 2000-12-15 | New alloy and method for producing same |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE9904668A SE9904668D0 (en) | 1999-12-17 | 1999-12-17 | New alloy and method for producing same |
SE9904668-2 | 1999-12-17 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2001044530A1 true WO2001044530A1 (en) | 2001-06-21 |
Family
ID=20418204
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/SE2000/002550 WO2001044530A1 (en) | 1999-12-17 | 2000-12-15 | New alloy and method for producing same |
Country Status (8)
Country | Link |
---|---|
EP (1) | EP1252353B1 (en) |
JP (1) | JP2003517099A (en) |
KR (1) | KR20020062761A (en) |
AU (1) | AU2563901A (en) |
DE (1) | DE60003952T2 (en) |
RU (1) | RU2002119009A (en) |
SE (1) | SE9904668D0 (en) |
WO (1) | WO2001044530A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN111676383A (en) * | 2020-06-09 | 2020-09-18 | 江苏亚峰合金材料有限公司 | Vermiculizer for heat-resistant cast iron and preparation method thereof |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4874576A (en) * | 1988-01-23 | 1989-10-17 | Metallgesellschaft Aktiengesellschaft | Method of producing nodular cast iron |
SE512201C2 (en) * | 1998-03-06 | 2000-02-14 | Sintercast Ab | Process for the preparation of Mg-treated iron with improved processability |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS616250A (en) * | 1984-12-10 | 1986-01-11 | Honda Motor Co Ltd | Corrosion resistant cast iron |
SE8701987L (en) * | 1987-05-26 | 1988-11-15 | Fischer Ag Georg | MAGNESIUM TREATED, COOLING ANGLE CAST IRON MATERIAL |
GB9207139D0 (en) * | 1992-04-01 | 1992-05-13 | Brico Eng | Sintered materials |
JP3763603B2 (en) * | 1996-01-30 | 2006-04-05 | 日本ピストンリング株式会社 | Abrasion-resistant cast iron and method for producing the same |
JPH108121A (en) * | 1996-06-25 | 1998-01-13 | Hitachi Metals Ltd | Inoculant for producing cv graphite cast iron and production of cv graphite cast iron using the inoculant |
SE520028C2 (en) * | 1998-07-03 | 2003-05-13 | Sintercast Ab | Process for the preparation of compact graphite iron alloy, this article, and the use of compact graphite alloy |
-
1999
- 1999-12-17 SE SE9904668A patent/SE9904668D0/en unknown
-
2000
- 2000-12-15 KR KR1020027007747A patent/KR20020062761A/en not_active Application Discontinuation
- 2000-12-15 EP EP00989092A patent/EP1252353B1/en not_active Expired - Lifetime
- 2000-12-15 DE DE60003952T patent/DE60003952T2/en not_active Expired - Fee Related
- 2000-12-15 RU RU2002119009/02A patent/RU2002119009A/en unknown
- 2000-12-15 JP JP2001545607A patent/JP2003517099A/en active Pending
- 2000-12-15 AU AU25639/01A patent/AU2563901A/en not_active Abandoned
- 2000-12-15 WO PCT/SE2000/002550 patent/WO2001044530A1/en not_active Application Discontinuation
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4874576A (en) * | 1988-01-23 | 1989-10-17 | Metallgesellschaft Aktiengesellschaft | Method of producing nodular cast iron |
SE512201C2 (en) * | 1998-03-06 | 2000-02-14 | Sintercast Ab | Process for the preparation of Mg-treated iron with improved processability |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN111676383A (en) * | 2020-06-09 | 2020-09-18 | 江苏亚峰合金材料有限公司 | Vermiculizer for heat-resistant cast iron and preparation method thereof |
Also Published As
Publication number | Publication date |
---|---|
EP1252353A1 (en) | 2002-10-30 |
RU2002119009A (en) | 2005-01-10 |
AU2563901A (en) | 2001-06-25 |
SE9904668D0 (en) | 1999-12-17 |
DE60003952T2 (en) | 2004-05-27 |
JP2003517099A (en) | 2003-05-20 |
KR20020062761A (en) | 2002-07-29 |
EP1252353B1 (en) | 2003-07-16 |
DE60003952D1 (en) | 2003-08-21 |
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