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IRON-BASED ALLOY AND METHOD FOR PRODUCING IRON-BASED ALLOY meetings

Foreign code F200010174
Posted date Jun 3, 2020
Country WIPO
International application number 2019JP034481
International publication number WO 2020050229
Date of international filing Sep 2, 2019
Date of international publication Mar 12, 2020
Priority data
  • P2018-165465 (Sep 4, 2018) JP
Title IRON-BASED ALLOY AND METHOD FOR PRODUCING IRON-BASED ALLOY meetings
Abstract The present invention provides an iron-based alloy having excellent corrosion resistance and high strength, and a method for producing the iron-based alloy. An iron-based alloy of the present invention includes Cr: 10-22 mass%, W: 1-12 mass%, and C: 0.1-2.3 mass%, with the balance being unavoidable impurities and Fe, and is made of a cast material having a structure essentially composed of austenite, or, a quenched material having a structure essentially composed of martensite, and in which carbide is precipitated. Additionally, the iron-based alloy may include Cu: 0.5-6 mass%, and/or, Ni: 0.5-2.5 mass%, and at least one among Al, Mo, and Si: 1-3 mass%.
Outline of related art and contending technology BACKGROUND ART
Resin in the market, and is excellent in strength and heat resistance of the super market, as well as the electronics industry and the automotive industry has been increased rapidly. In particular, the automobile companies, CO2 emission reduction (improvement of fuel efficiency) in order to achieve a reduction in the weight of the vehicle body in the tackle, the weight of the vehicle accounts for 6-7 of the steel material referred to as substitution and actively advanced, as the most effective means, are subjected to the resin component. In addition, improve the comfort and safety for the purpose of ' car-electronics' are sought, the heat resistance and excellent durability in a high-function super employed ubiquitously.
Is super, polyamide 11, or polyphenylene sulfide (PPS) resin 12 (PA11,12), and the type of fluorocarbon resin or the like, strength and operating temperature, and chemical resistance characteristics, depending on the use environment is obtained. Of the resin used in the field of automobile engineering plastic, PPS resin, and then to the PA11,12 is frequently used, the casing of the ignition coil, head lamp reflector, such as a fuel pump impeller used in the application. In addition, the PPS resin, heat resistance, heat check-resistant, excellent in chemical resistance, such as ECU and the sensor in recent years the demand of the electrical component case increases. Used in the field in the electrical and electronic engineering plastic resin, in view of the worldwide-precision molding, excellent flame retardance of the PPS resin most demand, a micro switch or CD drive is employed in the optical pickup and the like. On the other hand, in a car or in the electronics industry is vigorous Japan, PPS resin and is inverted and the demand of PA11,12 demand, continuously occupy the top.
High added value in this way, the world market and the domestic market is expected to be a rapid increase in the PPS resin, the molding step are the largest of the problem, use of the part of the life of the molding machine. PPS resin, corrosion of the molten plasticized at the time ' (SO2) increasing the gas' is generated, a device that can withstand harsh use environment develop a member that has been a problem. In addition, in order to improve the strength of the components added to the wear due to the hardened filler (glass fibers: GF) also becomes serious example is generated. Therefore, the mold for molding a thermoplastic such as the coding device and the metal parts in contact with the molten resin is damaged significantly corrosive wear, filling failure or defect early plasticized, suffers from a problem that malfunction or the like shape. In recent years, been made of the filler is increased, its risk is becoming more and more serious situation is minimized.
In order to solve such a problem, the conventional PPS resin-molding plastic in the device, relatively good corrosion resistance, Fe-Cr system is capable of hardening by quenching an alloy such as (SKD11,SUS420J2,SUS440C) or, hard chromium plating and titanium nitride coating is used. However, Fe-Cr-based alloy such as SKD11 is not corrosion resistance and wear resistance is not sufficient, the plasticized device regularly measuring the dimensions of parts, and in the case of wear than the reference value, when the surface roughness is visually confirmed, a constant based on the record operation until the number of shots in the case of using, such as before the failure occurs in the exchange of the countermeasure is set in the current state of the art. In addition, the surface treatment of the coating or the like, since the problem of peeling, can be used for a long time is difficult.
Therefore, the Fe-Cr-based alloy or the like SKD11, instead of the coating, the thermoplastic resin for molding the coding device and as the mold material, or martensitic stainless steel is used has been proposed (for example, see Patent Document 1 to 3).
Scope of claims (In Japanese)[請求項1]
 Cr:10~22質量%、W:1~12質量%、C:0.1~2.3質量%を含み、残部が不可避不純物とFeとから成ることを特徴とする鉄基合金。

[請求項2]
 さらに、Cu:0.5~6質量%、および/または、Ni:0.5~2.5質量%を含むことを特徴とする請求項1記載の鉄基合金。

[請求項3]
 さらに、Al、MoおよびSiのうちの少なくとも1つを、1~3質量%含むことを特徴とする請求項1または2記載の鉄基合金。

[請求項4]
 鋳造材から成ることを特徴とする請求項1乃至3のいずれか1項に記載の鉄基合金。

[請求項5]
 ビッカース硬度がHV250以上であることを特徴とする請求項4記載の鉄基合金。

[請求項6]
 マルテンサイトを主体とし、M 23C 6型炭化物が析出した組織を有することを特徴とする請求項1乃至3のいずれか1項に記載の鉄基合金。

[請求項7]
 ビッカース硬度がHV400以上であることを特徴とする請求項6記載の鉄基合金。

[請求項8]
 転位密度が0.2×10 16m -2以上であり、ビッカース硬度がHV380以上であることを特徴とする請求項6または7記載の鉄基合金。

[請求項9]
 転位密度が0.7×10 16m -2以上であり、ビッカース硬度がHV500以上であることを特徴とする請求項6または7記載の鉄基合金。

[請求項10]
 樹脂成型用の可塑化装置または金型に用いられることを特徴とする請求項1乃至9のいずれか1項に記載の鉄基合金。

[請求項11]
 Cr:10~22質量%、W:1~12質量%、C:0.1~2.3質量%を含み、残部が不可避不純物とFeとから成る原料を鋳造することを特徴とする鉄基合金の製造方法。

[請求項12]
 前記原料は、さらに、Cu:0.5~6質量%、および/または、Ni:0.5~2.5質量%を含むことを特徴とする請求項11記載の鉄基合金の製造方法。

[請求項13]
 前記原料は、さらに、Al、MoおよびSiのうちの少なくとも1つを、1~3質量%含むことを特徴とする請求項11または12記載の鉄基合金の製造方法。

[請求項14]
 前記原料を鋳造した材料、または、鋳造後に加工した材料を、600℃~1250℃で0.5~24時間の熱処理後、急冷することにより、マルテンサイトを主体とし、M 23C 6型炭化物が析出した組織を有する鉄基合金を製造することを特徴とする請求項11乃至13のいずれか1項に記載の鉄基合金の製造方法。
  • Applicant
  • ※All designated countries except for US in the data before July 2012
  • TOHOKU UNIVERSITY
  • Inventor
  • YAMANAKA KENTA
  • CHIBA AKIHIKO
IPC(International Patent Classification)
Specified countries National States: AE AG AL AM AO AT AU AZ BA BB BG BH BN BR BW BY BZ CA CH CL CN CO CR CU CZ DE DJ DK DM DO DZ EC EE EG ES FI GB GD GE GH GM GT HN HR HU ID IL IN IR IS JO JP KE KG KH KN KP KR KW KZ LA LC LK LR LS LU LY MA MD ME MG MK MN MW MX MY MZ NA NG NI NO NZ OM PA PE PG PH PL PT QA RO RS RU RW SA SC SD SE SG SK SL SM ST SV SY TH TJ TM TN TR TT TZ UA UG US UZ VC VN ZA ZM ZW
ARIPO: BW GH GM KE LR LS MW MZ NA RW SD SL SZ TZ UG ZM ZW
EAPO: AM AZ BY KG KZ RU TJ TM
EPO: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
OAPI: BF BJ CF CG CI CM GA GN GQ GW KM ML MR NE SN ST TD TG
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