KR0147754B1 - Iron alloy for valve of concrete pump car - Google Patents

Iron alloy for valve of concrete pump car

Info

Publication number
KR0147754B1
KR0147754B1 KR1019950013642A KR19950013642A KR0147754B1 KR 0147754 B1 KR0147754 B1 KR 0147754B1 KR 1019950013642 A KR1019950013642 A KR 1019950013642A KR 19950013642 A KR19950013642 A KR 19950013642A KR 0147754 B1 KR0147754 B1 KR 0147754B1
Authority
KR
South Korea
Prior art keywords
valve
concrete pump
pump car
concrete
present
Prior art date
Application number
KR1019950013642A
Other languages
Korean (ko)
Other versions
KR960041392A (en
Inventor
지용권
양승호
Original Assignee
유상부
삼성중공업주식회사
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
Application filed by 유상부, 삼성중공업주식회사 filed Critical 유상부
Priority to KR1019950013642A priority Critical patent/KR0147754B1/en
Publication of KR960041392A publication Critical patent/KR960041392A/en
Application granted granted Critical
Publication of KR0147754B1 publication Critical patent/KR0147754B1/en

Links

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
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • 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
    • C22C38/20—Ferrous alloys, e.g. steel alloys containing chromium with copper
    • 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
    • C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
    • 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
    • C22C38/32—Ferrous alloys, e.g. steel alloys containing chromium with boron
    • 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
    • C22C38/34—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of silicon
    • 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
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
    • 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
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Reciprocating Pumps (AREA)
  • Details Of Reciprocating Pumps (AREA)

Abstract

본 발명은 콘크리트 펌프카의 밸브용 철기합금에 관한 것으로 특히 자갈, 모래, 시켄트, 물등이 혼합된 콘크리트를 접근하기 곤란한 원하는 위치에 공급하는 콘크리트 펌프카의 밸브용 철기합금에 관한 것이다.The present invention relates to a ferrous alloy for a valve of a concrete pump car, and more particularly to a ferrous alloy for a valve of a concrete pump car for supplying a concrete concrete mixed with gravel, sand, secant, water, etc. to a desired location difficult to access.

본 발명은 구성부품을 중량 %로 C: 1~4.5%, Si: 2.5%이하, Mn: 0.4~2%, Cr : 0.5~35%, 나머지Fe 및 불순물로 조성되어 내마모성이 우수한 콘크리트 펌프카의 밸브용 철기합금을 제공한다.The present invention is composed of a component by weight of C: 1 to 4.5%, Si: 2.5% or less, Mn: 0.4 to 2%, Cr: 0.5 to 35%, the rest of the Fe and impurity concrete pump car valves Provide ferrous alloys.

Description

내마모성이 우수한 콘크리트 펌프카의 밸브용 철기합금Iron alloy for valves in concrete pump cars with high wear resistance

제1도(a)는 콘크리트 펌프카의 스윙밸브의 구조도.1 (a) is a structural diagram of a swing valve of a concrete pump car.

제1도(b)는 제1도(a)의 플레이트 사시도.FIG. 1 (b) is a perspective view of the plate of FIG.

제1도(c)는 제1도(a)의 링의 사시도.FIG. 1c is a perspective view of the ring of FIG.

제2도는 콘크리트 펌프카의 슬라이딩 밸브의 구조도.2 is a structural diagram of a sliding valve of a concrete pump car.

제3도는 경도에 따른 재료의 내마모성 비교 그래프이다.3 is a graph of abrasion resistance comparison of materials with hardness.

* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings

11,21 : 플레이트 12 : 링11,21: plate 12: ring

13 : 유압실린더 14 : 분사관13: hydraulic cylinder 14: injection pipe

15 : 챔버 16 : 피스톤 로드15 chamber 16: piston rod

21 : 밸브 플레이트 22 : 하부 밸브플레이트21: valve plate 22: lower valve plate

23 : 상부 밸브플레이트 24 : 로드23: upper valve plate 24: rod

본 발명은 콘크리트 펌프카의 밸브용 철기합금에 관한 것으로, 특히 자갈, 모래, 시멘트, 물 등이 혼합된 콘크리트를 접근하기 곤란한 위치에 공급하는 콘크리트 펌프카의 밸브에 사용되는 내마모특성이 우수한 밸브용 철기합금에 관한 것이다.The present invention relates to a ferrous alloy for valves of concrete pump cars, in particular valves for iron valves having excellent wear resistance characteristics used in the valves of concrete pump cars to supply concrete, mixed with gravel, sand, cement, water, etc. Relates to an alloy.

콘크리트 펌프카는 자갈, 모래, 시멘트, 물등이 혼합된 콘크리트를 접근하기 곤란한 위치에 공급하는 것을 목적으로 하는 건설기계로서 콘크리트 펌프카를 적당한 위치에 안착시키고 유압실린더에 직결하는 콘크리트 실린더(보통 2개)에 호퍼에서 콘크리트가 이송되어 오면 콘크리트 펌프카 밸브 피스톤의 작동으로 분사관과 호스를 통해 현장타설에 콘크리트를 공급하게 되어 있다.Concrete pump car is a construction machine that aims to supply concrete mixed with gravel, sand, cement, water, etc. in a location that is difficult to access. When concrete is transported from the hopper, the concrete pump car valve piston acts to supply concrete to the cast through the injection pipe and hose.

이와 같은 콘크리트 펌프카의 밸브에는 제1도와 같은 구조를 갖는 스윙밸브와 제2도와 같은 구조를 갖는 슬라이딩 밸브가 있다.The valve of the concrete pump car includes a swing valve having a structure as shown in FIG. 1 and a sliding valve having a structure as shown in FIG.

스윙밸브는 플레이트(11), 링(12), 유압실린더(13), 분사관(14), 챔버(15) 및 피스톤로드(16)로 이루어지고, 슬라이딩 밸브는 상기 구성품의 플레이트(11), 링(12) 대신에 밸브 플레이트(21), 하부 플레이트(22), 상부 플레이트(23) 및 로드(24)로 이루어진다.The swing valve consists of a plate 11, a ring 12, a hydraulic cylinder 13, an injection pipe 14, a chamber 15 and a piston rod 16, the sliding valve is a plate 11 of the components, Instead of the ring 12 it consists of a valve plate 21, a lower plate 22, an upper plate 23 and a rod 24.

이와 같은 밸브의 구성부품들은 콘크리트 공급작업시에 자갈, 모래, 시멘트, 물로 이루어진 콘크리트에 의해 마모가 극심해짐으로써 밸브가 제 기능을 발휘하지 못하고 내구성이 낮아지는 문제점이 있었다.Such components of the valve have a problem in that the valve is not functioning and the durability is lowered due to the extreme wear caused by concrete made of gravel, sand, cement, and water during the concrete supply operation.

이러한 문제를 해소하기 위한 방안으로 종래 콘크리트 펌프카 밸브의 부품들을 크롬, 몰리브덴 등이 함유된 합금강을 고주파 열처리하는 방법이 사용되고 있지만, 상기 종래 밸브부품의 실제 경도는 HRC 45~53 정도이었다.In order to solve this problem, a method of high frequency heat treatment of alloy steel containing chromium, molybdenum and the like of conventional concrete pump car valve parts is used, but the actual hardness of the conventional valve parts was about HRC 45 to 53.

한편, 제3도에 도시된 바와 같이 자갈, 모래, 시멘트 등에 대한 금속의 내마모성은 그 경도에 비례하는 것을 알 수 있으며, 이러한 이유로 낮은 경도치를 가지고 있는 종래의 합금강들은 내마모성이 향상되지 내구성에 대한 문제점을 해결하지 못하였다.On the other hand, as shown in Figure 3 it can be seen that the wear resistance of the metal to the gravel, sand, cement, etc. is proportional to the hardness, for this reason, conventional alloy steels having a low hardness value does not improve the wear resistance is a problem for durability Did not solve.

따라서, 본 발명은 상기와 같은 문제점을 해결하기 위하여 안출된 것으로서 콘크리트 펌프카 밸브의 구성부품인 플레이트, 링, 로드 등에 내마모성이 우수한 소재를 적용하고 열처리를 행하여 내마모성을 향상시킴으로써 밸브의 기능을 잃지 않고 내구성을 증가시킨 콘크리트 펌프카의 밸브용 철기합금을 제공하는 것을 그 목적으로 한다.Therefore, the present invention is devised to solve the above problems, and applied to a plate, ring, rod, etc., which is a component of a concrete pump car valve, a material having excellent wear resistance, and performing heat treatment to improve wear resistance. It is an object of the present invention to provide a ferrous alloy for the valve of the concrete pump car increased.

상기와 같은 목적을 달성하기 위하여 본 발명은 구성부품을 중량%로 C : 1~4.5%, Si : 2.5% 이하, Mn : 0.2~2%, Cr : 0.5~35%, 그리고 Ni, Mo, B, Cu 중 1종 또는 2종 이상을 각각 5% 이하, 잔부 Fe 및 불순물로 조성된 것을 특징으로 하는 내마모성이 우수한 콘크리트 펌프카의 밸브용 철기합금을 제공한다.In order to achieve the above object, the present invention is a component by weight of C: 1 to 4.5%, Si: 2.5% or less, Mn: 0.2 to 2%, Cr: 0.5 to 35%, and Ni, Mo, B Provides a ferrous alloy for valves of a concrete pump car excellent in wear resistance, characterized in that one or two or more of Cu, 5% or less, the balance of Fe and impurities.

이하 본 발명을 상세히 설명한다.Hereinafter, the present invention will be described in detail.

본 발명에서 사용되는 소재는 Fe를 주성분으로 하는 철기합금으로 각 성분의 양은 중량%로 C : 1~4.5%, Si : 2.5% 이하, Mn : 0.4~2%, Cr : 0.5~35%, 각각 5%이하의 Ni, Mo, B, Cu 중 1종 또는 2종 이상, 그리고 잔부 Fe 및 불순물이다.The material used in the present invention is an iron-based alloy containing Fe as a main component, the amount of each component in weight% C: 1 ~ 4.5%, Si: 2.5% or less, Mn: 0.4 ~ 2%, Cr: 0.5 ~ 35%, respectively 1% or 2 or more of Ni, Mo, B, and Cu below 5%, and remainder Fe and an impurity.

이하 상기 합금의 수치한정의 이유에 대하여 설명한다.The reason for the numerical limitation of the alloy is described below.

C 및 Mn은 재료의 강도와 경도를 높이기 위해 필수적으로 요구되는 원소이며 특히 C는 Si, Mn의 양에 따라 감소할 수 있으나, 4.5wt% 이상에서는 주입성이 크게 저하하며, 탄화물 형성을 위해서는 최소 1wt% 이상 요구되므로 1~4.5wt%로 제한한다.C and Mn are essential elements to increase the strength and hardness of the material. Especially, C can be reduced depending on the amount of Si and Mn, but the implantability is greatly deteriorated at 4.5wt% or more, and minimum to form carbide. 1wt% or more is required, so limit to 1 ~ 4.5wt%.

Mn은 유황과 화합하여 유화망간(MnS)을 형성함으로써 유황의 해를 없애주는 역할을 하므로 최소한 0.4wt% 이상 첨가되며, 탄소량 감소시 최고 2wt% 까지 함유할 수 있으나 그 이상에서는 절삭성이 감소하고 내마모성에 효과가 없으므로 제한한다.Mn combines with sulfur to form manganese emulsifier (MnS) to remove sulfur. Therefore, Mn is added at least 0.4wt% and can contain up to 2wt% when carbon is reduced. It has no effect on wear resistance, so it is limited.

Si는 내열성을 부여하고 기지조직인 α 페라이트를 강화하는 효과가 있으나 2.5wt% 이상에서는 취성이 있는 화합물이 나타나며 결정입계에 망상의 페라이트가 생기게 하므로 절삭가공성을 해쳐 제한한다.Si has the effect of imparting heat resistance and reinforcing the α ferrite, which is a matrix structure, but brittle compounds appear at 2.5wt% or more, and thus, the machinable ferrite is formed at the grain boundaries, thereby limiting the machinability.

Cr은 본 발명에서 고경도, 저마찰계수, 내식, 내열성을 향상시키는데 매우 중요한 원소로서 35wt%까지 첨가하며 그 이상은 효과가 증대되지 않으므로 제한하며, 최소한0.5wt% 이상을 첨가하여야 그 효과가 나타난다.Cr is a very important element to improve the high hardness, low friction coefficient, corrosion resistance, and heat resistance in the present invention is added up to 35wt% and the effect is not increased because it is limited, at least 0.5wt% or more is added to show the effect .

한편, Ni,Mo, Cu, B는 재료의 경도를 높이고 마찰특성을 더욱 개선하기 위하여 각각 5Wt% 이내로 단독 또는 복합 첨가될 수 있다.On the other hand, Ni, Mo, Cu, B may be added alone or in combination within 5Wt%, respectively, in order to increase the hardness of the material and further improve the friction characteristics.

예를 들어 Ni는 다량의 규소에 의한 흑연화조직 조대화 방지 원소로 Cr, Mo, Cu 등의 다른 합금과 함께 인장강도, 절삭성, 경도, 내충격성을 증가시키므로 5wt% 이하 범위로 첨가한다.For example, Ni is an element for preventing coarsening of graphitized structure by a large amount of silicon and increases the tensile strength, machinability, hardness, and impact resistance together with other alloys such as Cr, Mo, and Cu, and therefore, Ni is added in the range of 5wt% or less.

Mo은 피로에 효과가 있으며 고온에서의 강도를 증가시키고 경화능을 증가시킬 뿐 아니라 내마모성 향상을 위한 열처리시 효과가 특히 크고 소입효과를 균일하게 하므로 5wt% 이하로 첨가한다.Mo is effective in fatigue and increases the strength at high temperatures and increases the hardenability, and is added at 5wt% or less because the effect is particularly large and the quenching effect is uniform to improve abrasion resistance.

Cu는 주철조직을 본질적으로 변화시키지는 않으나 소지를 치밀하게 하고 인장강도, 항절강도, 경도 등을 첨가량에 따라 직선적으로 증가시키며 내마모성, 내마찰성, 내충격성, 내부식성을 증가시키고 Cr과 함께 내열성을 증가시키므로 5wt% 이하로 첨가한다.Cu does not inherently change the cast iron structure, but it densifies the base and increases the tensile strength, tensile strength, hardness, etc. linearly with the added amount. Add to 5wt% or less as it increases.

B은 칠(Chill)을 형성하여 백선을 발생시키기 쉬우며 다량의 사용할 때에는 주물의 두께가 두터운 것이라도 풀림에 의해 흑연화하지 않으므로 5wt% 이하로 첨가한다.B is easy to generate white line by forming chill, and when used in a large amount, even if the casting thickness is thick, it is not graphitized by annealing, so it is added at 5wt% or less.

[실시예]EXAMPLE

이하 실시예를 들어 본 발명을 보다 구체적으로 설명한다.The present invention will be described in more detail with reference to the following Examples.

하기 표1과 같은 조성으로 이루어진 합금으로 플레이트, 링, 로드 등의 콘크리트 펌프카 밸브의 구성부품을 제조한다.To manufacture the components of the concrete pump car valves, such as plates, rings, rods with an alloy consisting of the composition shown in Table 1.

상기 합금으로 구성부품을 제조한 후 소정의 방식으로 열처리를 실시한다.After the component is manufactured from the alloy, heat treatment is performed in a predetermined manner.

이와 같이 열처리를 행한 본 발명의 상기 밸브의 구성부품의 경도를 측정한 결과 표1에 도시된 바와 같이 HRC 55~70을 나타내었다.As a result of measuring the hardness of the components of the valve of the present invention subjected to the heat treatment as shown in Table 1 it was shown HRC 55 ~ 70.

또한, Cr, Mo 등이 함유된 합금강을 사용하여 밸브 구성부품을 제조한 후 본 발명과 같은 방법으로 고주파 처리한 종래의 밸브의 경도를 측정한 결과는 HRC 50~53의 범위를 나타내었다.In addition, the results of measuring the hardness of the conventional valves prepared by high-frequency treatment in the same manner as the present invention after manufacturing valve components using alloy steel containing Cr, Mo and the like showed the range of HRC 50-53.

상기 표1에서 P와 S는 불가피한 불순물이다.In Table 1, P and S are inevitable impurities.

상기 표1에 나타낸 바와 같이 종래 콘크리트 펌프카의 밸브 구성부품의 경도치(HRC 50~53)보다 본 발명에 따른 밸브 구성부품의 경도치(HRC 60~63)가 훨씬 높으며 그에 따라 경도치에 비례하는 내마모성의 성질상 본 발명이 우수하다는 것을 쉽게 알 수 있다.As shown in Table 1, the hardness value (HRC 60-63) of the valve component according to the present invention is much higher than the hardness value (HRC 50-53) of the valve component of the conventional concrete pump car, which is proportional to the hardness value. It can be easily seen that the present invention is excellent in terms of wear resistance.

상기한 바와 같이 본 발명은 플레이트, 링, 로드 등의 콘크리트 펌프가 밸브의 구성부품을 고경도의 소재를 사용하여 형성한 후 열처리하여 제조함으로써 자갈, 모래, 시멘트, 물로 이루어진 콘크리트에 대하여 우수한 내마모성을 가지게 되어 밸브의 기능을 떨어뜨리지 않고 내구수명을 향상시킬 수 있는 효과가 있다.As described above, according to the present invention, a concrete pump such as a plate, a ring, or a rod is formed by heat treatment after forming a component of a valve using a material of high hardness, thereby providing excellent wear resistance against concrete made of gravel, sand, cement, and water. It has the effect of improving the durability life without degrading the function of the valve.

Claims (1)

중량%로 C : 1~4.5%, Si : 2.5% 이하, Mn : 0.2~2%, Cr : 0.5~35%, 그리고 Ni, Mo, B, Cu 중 1종 또는 2종 이상이 각각 5% 이하 첨가되며 잔부 Fe 및 불순물로 조성된 것을 특징으로 하는 내마모성이 우수한 콘크리트 펌프카의 밸브용 철기합금.By weight%, C: 1 ~ 4.5%, Si: 2.5% or less, Mn: 0.2 ~ 2%, Cr: 0.5 ~ 35%, and one or two or more of Ni, Mo, B, and Cu, respectively, 5% or less Iron base alloy for valves of concrete pump cars with excellent wear resistance, characterized in that the addition is made of the balance Fe and impurities.
KR1019950013642A 1995-05-29 1995-05-29 Iron alloy for valve of concrete pump car KR0147754B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1019950013642A KR0147754B1 (en) 1995-05-29 1995-05-29 Iron alloy for valve of concrete pump car

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1019950013642A KR0147754B1 (en) 1995-05-29 1995-05-29 Iron alloy for valve of concrete pump car

Publications (2)

Publication Number Publication Date
KR960041392A KR960041392A (en) 1996-12-19
KR0147754B1 true KR0147754B1 (en) 1998-11-02

Family

ID=19415708

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1019950013642A KR0147754B1 (en) 1995-05-29 1995-05-29 Iron alloy for valve of concrete pump car

Country Status (1)

Country Link
KR (1) KR0147754B1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107312980A (en) * 2017-06-12 2017-11-03 苏州优霹耐磨复合材料有限公司 A kind of boracic iron-based hard facing alloy
CN108456820A (en) * 2018-01-19 2018-08-28 江苏双星特钢有限公司 A kind of dual alloy composite hammer head and its manufacturing method
CN112226671A (en) * 2020-09-29 2021-01-15 安徽索立德铸业有限公司 Wear-resistant corrosion-resistant alloy for water pump casting and preparation method thereof

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20020074936A (en) * 2001-03-22 2002-10-04 코리아지에이취(주) Abrasion alloy for against slurry
MA44552B1 (en) * 2016-06-24 2020-11-30 Weir Minerals Australia Ltd Erosion and corrosion resistant white cast iron
CN115354208B (en) * 2022-07-25 2023-10-31 安徽新马铸造科技有限公司 High-chromium alloy composite wear-resistant steel ball

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107312980A (en) * 2017-06-12 2017-11-03 苏州优霹耐磨复合材料有限公司 A kind of boracic iron-based hard facing alloy
CN108456820A (en) * 2018-01-19 2018-08-28 江苏双星特钢有限公司 A kind of dual alloy composite hammer head and its manufacturing method
CN112226671A (en) * 2020-09-29 2021-01-15 安徽索立德铸业有限公司 Wear-resistant corrosion-resistant alloy for water pump casting and preparation method thereof

Also Published As

Publication number Publication date
KR960041392A (en) 1996-12-19

Similar Documents

Publication Publication Date Title
EP1384794B1 (en) Spheroidal cast iron particulary for piston rings and method for its production
EP2057297B1 (en) Improved powder metallurgy composition
US6702905B1 (en) Corrosion and wear resistant alloy
AU2013344748B2 (en) Method for the production of high-wear-resistance martensitic cast steel and steel with said characteristics
KR20170055560A (en) High-hardness low-alloy wear-resistant steel sheet and method of manufacturing the same
US5188659A (en) Sintered materials and method thereof
KR20170073715A (en) High-Performance Low-Alloy Wear-Resistant Steel Sheet and Method of Manufacturing the Same
GB2153846A (en) Cast iron alloy for grinding media
KR20150034581A (en) High-hardness, high-toughness, wear-resistant steel plate and manufacturing method thereof
GB2248454A (en) Sintered materials
KR970043238A (en) Steels and spare parts for manufacturing separate mechanical parts
JPH08253846A (en) Iron-based alloy for mold for plastic
KR0147754B1 (en) Iron alloy for valve of concrete pump car
JPS6126754A (en) Double-layered cylinder liner having superior wear resistance
US5261975A (en) Steel for ball and roller bearings
EP0613960B1 (en) Heat-resistant, austenitic cast steel and exhaust equipment member made thereof
JP2006037177A (en) Age-hardening steel
KR20020028913A (en) Sintered steel material
KR20210010781A (en) Rod for hydraulic breaker and method for manufacturing the same
JP4504736B2 (en) Austenitic cast steel product and manufacturing method thereof
KR960006038B1 (en) Chrom-carbide type alloy
KR100309214B1 (en) Conveying components for concrete pump car
RU2378096C1 (en) Material for overlaying welding of rollers for continuous-casting plant by open or close arc
KR101776491B1 (en) High strength spring steel having excellent corrosion resistance
JPS57188647A (en) Steel pipe with wear resistance

Legal Events

Date Code Title Description
A201 Request for examination
E902 Notification of reason for refusal
E701 Decision to grant or registration of patent right
GRNT Written decision to grant
FPAY Annual fee payment

Payment date: 20010402

Year of fee payment: 4

LAPS Lapse due to unpaid annual fee