WO1995020686A1 - Acier moule a forte teneur en manganese et resistant a l'usure - Google Patents

Acier moule a forte teneur en manganese et resistant a l'usure Download PDF

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Publication number
WO1995020686A1
WO1995020686A1 PCT/JP1994/000130 JP9400130W WO9520686A1 WO 1995020686 A1 WO1995020686 A1 WO 1995020686A1 JP 9400130 W JP9400130 W JP 9400130W WO 9520686 A1 WO9520686 A1 WO 9520686A1
Authority
WO
WIPO (PCT)
Prior art keywords
wear
steel
wear resistance
amount
manganese
Prior art date
Application number
PCT/JP1994/000130
Other languages
English (en)
Japanese (ja)
Inventor
Saburo Kunioka
Hiroshi Toriyama
Original Assignee
Shinhokoku Steel Corporation
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to JP4-191446A priority Critical patent/JP3005363B2/ja
Priority claimed from JP4-191446A external-priority patent/JP3005363B2/ja
Application filed by Shinhokoku Steel Corporation filed Critical Shinhokoku Steel Corporation
Priority to CA002159358A priority patent/CA2159358C/fr
Priority to US08/532,768 priority patent/US5601782A/en
Priority to PCT/JP1994/000130 priority patent/WO1995020686A1/fr
Priority to EP94905234A priority patent/EP0692548B1/fr
Priority to AU58918/94A priority patent/AU673050B2/en
Publication of WO1995020686A1 publication Critical patent/WO1995020686A1/fr

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/38—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of manganese

Definitions

  • the present invention relates to a wear-resistant high-manganese steel used for parts having excellent impact resistance and wear resistance, such as a blade of an ore crusher and a caterpillar show for a transport machine.
  • Construction equipment used for crushing ore at various mines is equipped with various parts such as crusher blades, caterpillar shows for transport equipment, bucket blades, rails, rail points, and the like.
  • the materials for these parts are required to have a minimum strength level as a structural member and to be excellent in wear resistance, impact resistance, corrosion resistance, and the like.
  • high manganese steels such as the headfield steels (1 to 1.3% carbon, 11.5 to 13% manganese), exhibit an austenite structure at room temperature and have a low yield point. Due to its high tensile strength and remarkable work hardening, the hardness and wear resistance are increased by cold working or surface sliding. Usually, hardened steel is heated to more than 150 ° C and quenched, the surface is hard and the inside is more tough.It has both abrasion and impact resistance. Tough steel.
  • Japanese Patent Application Laid-Open Nos. 54-43818, 57-39158, and 55-5335-13 describe Ti, Abrasion-resistant high-manganese steel and high-carbon manganese whose crystal grains are refined by adding small amounts of various carbide-forming elements such as V, Cu, Zr, Ce, Mo, W, and Nb.
  • a wear-resistant high manganese steel in which a small amount of spherical carbide is precipitated on a steel base is described.
  • the wear resistance is improved to some extent by the precipitation strengthening of the spherical carbides.
  • the austenitic base material itself is not improved, and the impact resistance is required. It is difficult to obtain sufficient wear resistance while maintaining the level.
  • the present invention has been made in order to solve the above-mentioned problems, and an object of the present invention is to provide a wear-resistant high-manganese steel excellent in wear resistance and impact resistance.
  • C is 1.3 to 1.4%
  • Si is 0.05 to 0.20%
  • Mn is 14.0% by weight.
  • C is determined in consideration of the balance between the amount of the carbide forming element and the Mn content. If the C content is less than 1.3%, a sufficient amount of carbides will not be precipitated and formed to strengthen the matrix, resulting in insufficient wear resistance. On the other hand, if the C content is more than 1.4%, the amount of precipitated carbides will be excessive and the impact resistance will decrease. The reason for this is that the toughness of the alloy steel generally improves as the content ratio of Mn to C (MnZC ratio) increases.
  • Si is added to high carbon high manganese steel in an amount of about 0.2 to 1.0% by weight.
  • the purpose of the addition of Si is to refine the molten metal and to improve the flow of the molten metal during production. These objectives can also be achieved by refining the melt using other means and consequently minimizing non-metallic inclusions, thus making the austenitic substrate essentially brittle. Excessive addition of Si to be converted is not preferred. For this reason, the upper limit of the amount of 51 was set to 0.2%, and the toughness was improved as much as possible.
  • the lower limit of the Si content was set to 0.05% because Si enters inevitably from scraps and the like, and is slightly used for purification as a deoxidizer. It can contribute at all. However, since the function as a deoxidizing agent can be substituted for ⁇ , the amount of Si should be as low as possible to prevent excessive deoxidation. It is most preferable that the Si content is in the range of 0.08 to 0.15%.
  • Mn is a major element that stabilizes the austenitic body, and in order to improve toughness, the Mn / C ratio must exceed a predetermined value. It is necessary to add it so that The required amount is determined by the carbon content. To obtain good toughness, the amount of C
  • the Cr enhances hardenability and decreases strength and toughness, which enhances power and wear resistance.
  • the lower limit of the Cr content is set to 0.5% because if it is less than this, practical wear resistance cannot be obtained.
  • the upper limit of the amount of Cr is set to 1.5%, because if it exceeds this, practical impact resistance cannot be obtained.
  • V is a powerful carbide-forming element, and when added in a small amount, improves the proof stress and refines the crystal grains, thereby contributing to the improvement of the wear resistance. However, excessive addition decreases the toughness. In order to balance wear resistance and impact resistance, the lower limit of V content was set to 0.3% and the upper limit was set to 0.8%.
  • T i is a strong carbide-forming element like V, and the addition of a small amount makes the crystal grains finer. Therefore, an excessive force that contributes to the improvement of wear resistance Excessive addition decreases the toughness.
  • the lower limit of the Ti amount was set to 0.2% and the upper limit was set to 0.4%.
  • Mo when added in a small amount, improves the yield point without lowering the toughness, improves the hardenability and the tempering resistance, and improves the wear resistance by forming carbides. For this reason, Mo is an element effective in preventing the occurrence of cracks in a thick-walled product. In order to exert such effects, the amount of Mo should be 0.5% or more. There is a need to. However, the effect of the addition of Mo saturates at 1.0%, so the upper limit was set to 1.0%.
  • FIG. 1 is a photograph showing a metal structure (magnification: 200 times) of a wear-resistant high manganese steel according to an example of the present invention.
  • Figure 2 shows a photograph showing the metal structure (magnification: 200 times) of conventional steel.
  • Figure 3 is a photograph showing the metal structure (magnification: 200 times) of conventional steel.
  • Table 1 shows an example of the composition of various steels of Example 1 and Comparative Examples 1 to 4, respectively. Comparative Example 2 does not contain molybdenum, and Comparative Example 4 does not contain vanadium.
  • Table 2 shows the results of examining various mechanical properties of the various steels of Example 1 and Comparative Examples 1 to 4. Mechanical properties were investigated for each of the following items: tensile strength, elongation, drawing, hardness, and impact value. Hardness is expressed in Brinell. The impact value was determined by a 2 mm V notch Charpy test.
  • Fig. 1 shows a sample taken from the stainless steel of Example 1 and the metal structure thereof was magnified 200 times. Granular and angular carbides are seen to precipitate in the crystal grains. In addition to these relatively large carbides, fine carbides are found throughout the austenitic body. This Such fine carbides are a mixture of vanadium carbide, titanium carbide, molybdenum carbide, and chromium carbide, and are extremely hard and contribute to improvement in wear resistance without impairing the required toughness. is there.
  • Figure 2 shows a sample taken from the stainless steel of Comparative Example 4 and its metal structure was magnified 200 times. A small amount of spherical molybdenum carbides is dispersed and precipitated in the grains, but the austenite base remains unchanged.
  • Figure 3 shows a sample taken from the stainless steel of Comparative Example 3 and its metallographic structure enlarged to 200 times. A small amount of spherical molybdenum carbide is dispersed and precipitated in the grains, but the austenite base remains as it is.
  • the steel according to the present invention has significantly improved wear resistance as compared with the conventional steel. For this reason, the life of various parts such as the ore crusher blades and caterpillars for transport machinery can be greatly extended.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Powder Metallurgy (AREA)
  • Heat Treatment Of Articles (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Manufacture Of Metal Powder And Suspensions Thereof (AREA)

Abstract

L'invention concerne un acier moulé à forte teneur en manganèse. Cet acier présente une excellente résistance à l'usure et aux chocs. Il comprend entre 1,3 et 1,4 % (en poids, et les pourcentages suivants sont également donnés en poids) de carbone, 0,05 - 0,20 % de silicium, 14,0 - 15,0 % de manganèse, 0,5 - 1,5 % de chrome, 0,3 - 0,8 % de vanadium, 0,2 - 0,4 % de titane, 0,5 - 1,0 % de molybdène, le reste se composant de fer et d'impuretés inévitables.
PCT/JP1994/000130 1992-06-26 1994-01-31 Acier moule a forte teneur en manganese et resistant a l'usure WO1995020686A1 (fr)

Priority Applications (6)

Application Number Priority Date Filing Date Title
JP4-191446A JP3005363B2 (ja) 1992-06-26 耐摩耗性高マンガン鋳鋼
CA002159358A CA2159358C (fr) 1994-01-31 1994-01-31 Acier moule a forte teneur en manganese et resistant a l'usure
US08/532,768 US5601782A (en) 1992-06-26 1994-01-31 Abrasive resistant high manganese cast steel
PCT/JP1994/000130 WO1995020686A1 (fr) 1992-06-26 1994-01-31 Acier moule a forte teneur en manganese et resistant a l'usure
EP94905234A EP0692548B1 (fr) 1992-06-26 1994-01-31 Acier moule a forte teneur en manganese et resistant a l'usure
AU58918/94A AU673050B2 (en) 1994-01-31 1994-01-31 Wear-resisting high-manganese cast steel

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP4-191446A JP3005363B2 (ja) 1992-06-26 耐摩耗性高マンガン鋳鋼
PCT/JP1994/000130 WO1995020686A1 (fr) 1992-06-26 1994-01-31 Acier moule a forte teneur en manganese et resistant a l'usure

Publications (1)

Publication Number Publication Date
WO1995020686A1 true WO1995020686A1 (fr) 1995-08-03

Family

ID=26435267

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP1994/000130 WO1995020686A1 (fr) 1992-06-26 1994-01-31 Acier moule a forte teneur en manganese et resistant a l'usure

Country Status (2)

Country Link
EP (1) EP0692548B1 (fr)
WO (1) WO1995020686A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10041156B2 (en) 2012-12-26 2018-08-07 Posco High strength austenitic-based steel with remarkable toughness of welding heat-affected zone and preparation method therefor
MX2017004258A (es) * 2014-10-01 2017-06-06 Nippon Steel & Sumitomo Metal Corp Material de acero de alta resistencia para pozos de petróleo y productos tubulares para la industria del petróleo.
US10227681B2 (en) 2015-10-21 2019-03-12 Caterpillar Inc. High manganese steel with enhanced wear and impact characteristics
EP3835446A4 (fr) * 2018-09-12 2021-10-13 JFE Steel Corporation Matériau en acier et son procédé de fabrication

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6144934B2 (fr) * 1979-04-28 1986-10-06 Daido Steel Co Ltd
JPS628509B2 (fr) * 1979-02-16 1987-02-23 Daido Steel Co Ltd

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE743476C (de) * 1940-03-28 1943-12-27 Roehrenwerke Ag Deutsche Austenitischer Manganstahl fuer Gegenstaende mit glatter Brennkante
US3556777A (en) * 1968-04-04 1971-01-19 Rexarc Inc Ferrous alloy containing high manganese and chromium
US4039328A (en) * 1975-08-11 1977-08-02 Jury Donatovich Novomeisky Steel

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS628509B2 (fr) * 1979-02-16 1987-02-23 Daido Steel Co Ltd
JPS6144934B2 (fr) * 1979-04-28 1986-10-06 Daido Steel Co Ltd

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP0692548A4 *

Also Published As

Publication number Publication date
JPH06145899A (ja) 1994-05-27
EP0692548B1 (fr) 1999-03-24
EP0692548A1 (fr) 1996-01-17
EP0692548A4 (fr) 1996-05-29

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