KR20030052885A - Grate ber with superior heat and wear resistance - Google Patents

Grate ber with superior heat and wear resistance Download PDF

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KR20030052885A
KR20030052885A KR1020010083015A KR20010083015A KR20030052885A KR 20030052885 A KR20030052885 A KR 20030052885A KR 1020010083015 A KR1020010083015 A KR 1020010083015A KR 20010083015 A KR20010083015 A KR 20010083015A KR 20030052885 A KR20030052885 A KR 20030052885A
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wear resistance
grate
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ber
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KR1020010083015A
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Korean (ko)
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박재현
김영섭
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재단법인 포항산업과학연구원
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Priority to KR1020010083015A priority Critical patent/KR20030052885A/en
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    • 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
    • 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
    • C22C38/54—Ferrous alloys, e.g. steel alloys containing chromium with nickel 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
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing 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
    • C22C38/04—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
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
    • 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
    • C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
    • 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
    • C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium

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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)

Abstract

PURPOSE: Provided is a grate bar for use in pallet in sintering machine is provided, which has superior heat and wear resistance. CONSTITUTION: The grate bar comprises C 1 to 2.5 wt.%, Mn 0.5 to 1.5 wt.%, 0.02 wt.% or less of P, 0.02 wt.% or less of S, Si 0.5 to 2 wt.%, Ni 1 to 2 wt.%, Cr 15 to 30 wt.%, B 0.1 to 2 wt.%, Mo 0.5 to 1.5 wt.%, W 0.2 to 1.3 wt.%, one or more than two elements selected from Nb 0.2 to 1.5 wt.%, V 0.2 to 1.5 wt.% and Ti 0.2 to 1.5 wt.%, a balance of Fe and incidental impurities.

Description

내열 및 내마모특성이 우수한 그레이트바{Grate ber with superior heat and wear resistance}Great bar with superior heat and wear resistance

본 발명은 제철소 소결공장 소결기 대차에 설치되어 장입원료의 지지 및 통기용 틈새를 형성하는 그레이트바(grate bar)에 관한 것으로서, 보다 상세하게는 기존재에 비해 내열 및 내마모 특성이 우수한 고수명용 그레이트바에 관한 것이다.The present invention relates to a grate bar that is installed in a sintering plant sinter plant bogie of a steelworks to form a gap for support of a feedstock and aeration, and more specifically, for high lifespan, which has excellent heat and wear resistance characteristics compared to existing materials. It's about the Great Bar.

일반적으로, 제철소에서는 소결광을 만들기 위해 소결광의 원료가 탑재된 컨베이어 벨트형의 대차를 연속적으로 고온로속에 통과시키게 되는데, 이때 소결원료의 통기도 유지 및 지지를 위해 그레이트바를 대차 바닥에 설치하여 사용하게 된다.In general, steel mills continuously pass a conveyor belt-type bogie loaded with sintered ore raw materials into a high temperature furnace to make sintered ore. At this time, a great bar is installed at the bottom of the bogie to maintain and support the sintered raw material. .

이러한 그레이트바는 Fe-Cr계 주물을 사용하여 제조되어 왔으며, 그 성분은 중량％로, C:1.2~1.8％, Mn:0.5~1％, P:0.04％이하, S:0.03％이하, Si:1~2％, Ni:1~1.5％, Cr:28％이상, 전부 Fe 및 기타 불가피한 불순물로 구성되었다.These great bars have been manufactured using Fe-Cr based castings, and the components are in weight%, C: 1.2 to 1.8%, Mn: 0.5 to 1%, P: 0.04% or less, S: 0.03% or less, Si 1: 2%, Ni: 1-1.5%, Cr: 28% or more, all composed of Fe and other unavoidable impurities.

상기와 같은 그레이트바의 경우, 고온내식성은 다소 우수하나 1,000℃ 이상의 온도에서도 일시적으로 노출됨에 따라 고온변형이 발생하고, 소결광 낙하시에 소결광과의 마찰에 의해 마모되어, 주기적으로 교체하여 사용됨으로써, 정비비와자재비를 증가시키는 문제가 있었다.In the case of the great bar as described above, the high temperature corrosion resistance is somewhat excellent, but as the temporary exposure even at a temperature of 1,000 ° C or more, high temperature deformation occurs, and it is worn by friction with the sintered ore during the dropping of the sintered ore, and is periodically replaced, There was a problem of increasing maintenance and materials costs.

본 발명은 상기와 같은 제반 문제점을 해결하기 위하여 창안된 것으로서, 종래의 성분에 고온에서 안정한 탄화물 형성원소를 첨가하여, 고온 내식성은 종래와 유사하면서 내열 및 내마모특성이 향상된 그레이트바를 제공하는데 그 목적이 있다.The present invention was devised to solve the above problems, and by adding carbide-forming elements stable at high temperature to the conventional components, the high temperature corrosion resistance is similar to the conventional, but provides a great bar with improved heat and abrasion resistance. There is this.

상기와 같은 목적을 달성하기 위한 본 발명의 내열 및 내마모특성이 우수한 그레이트바는, 중량％로, C:1~2.5％, Mn:0.5~1.5％, P:0.02％이하, S:0.02％이하, Si:0.5~2％, Ni:1~2％, Cr:15~30％, B:0.1-2％, Mo:0.5~1.5％, W:0.2~1.3％를 함유하고, 여기에 Nb:0.2~1.5％및 Ti:0.2~1.5％으로 이루어지는 그룹중 1종 또는 2종 이상이 추가로 함유되고, 잔부 Fe 및 기타 불가피한 불순물로 구성된다.The great bar which is excellent in the heat resistance and abrasion resistance of this invention for achieving the above objective is a weight%, C: 1-2.5%, Mn: 0.5-1.5%, P: 0.02% or less, S: 0.02% Hereinafter, Si: 0.5-2%, Ni: 1-2%, Cr: 15-30%, B: 0.1-2%, Mo: 0.5-1.5%, W: 0.2-1.3% are contained, Nb here 1 type (s) or 2 or more types of group which consist of 0.2 to 1.5% and Ti: 0.2 to 1.5% is further contained, and it consists of remainder Fe and other unavoidable impurities.

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

본 발명에서는, 그레이트바(grate bar)의 내열 및 내마모특성을 동시에 향상 시키기 위하여 고온에서 안정한 탄화물 형성원소를 첨가하게 된다.In the present invention, in order to simultaneously improve the heat and wear resistance of the grate bar, a carbide forming element stable at high temperature is added.

즉, B, Mo, W, Nb, V 및 Ti 등의 합금원소들은 탄화물 형성원소로서, 고온에서 안정하기 때문에, 이들 원소를 첨가하여 그레이트바를 제조하면, 고온 및 내마모특성이 향상된다.That is, alloying elements such as B, Mo, W, Nb, V, and Ti are carbide forming elements, and are stable at high temperatures. Therefore, when the great bar is prepared by adding these elements, high temperature and wear resistance characteristics are improved.

후술하는 바와 같은 실시예의 결과로부터, 본 발명에 따른 그레이트바는, 중량％로, C:1~2.5％, Mn:0.5~1.5％, P:0.02％이하, S:0.02％이하, Si:0.5~2％,Ni:1~2％, Cr:15~30％, B:0.1-2％, Mo:0.5~1.5％, W:0.2~1.3％를 함유하고, 여기에 Nb:0.2~1.5％, V:0.2~1.5％ 및 Ti:0.2~1.5％으로 이루어지는 그룹중 1종 또는 2종 이상이 추가로 함유되고, 잔부 Fe 및 기타 불가히한 불순물로 구성된다.From the result of the Example as mentioned later, the Great Bar which concerns on this invention is C%-2.5%, Mn: 0.5-1.5%, P: 0.02% or less, S: 0.02% or less, Si: 0.5 by weight%. 2%, Ni: 1-2%, Cr: 15-30%, B: 0.1-2%, Mo: 0.5-1.5%, W: 0.2-1.3%, Nb: 0.2-1.5% , V: 0.2 to 1.5% and Ti: 0.2 to 1.5% of the group further contains one or two or more, and is composed of the balance Fe and other impossible impurities.

이하, 각 성분의 조성범위에 대하여 설명한다.Hereinafter, the composition range of each component is demonstrated.

C는 1~2.5％ 함유되는 것이 바람직하다. 함량이 1％ 미만이면, 경도가 저하되고, 탄화물 형성이 용이하기 않으며, 2.5％ 보다 많으면, 경도는 향상되나 내충격성이 저하되어 바람직하지 않다.It is preferable to contain 1 to 2.5% of C. If the content is less than 1%, the hardness decreases, and carbide formation is not easy. If the content is more than 2.5%, the hardness is improved, but the impact resistance is lowered, which is not preferable.

Mn은 0.5~1.5％ 첨가되는 것이 바람직한데, 그 이유는, 0.5％ 미만으로 함유되면, 충격치는 증가하나 경도가 낮아지고, 1.5％ 보다 많으면, 내충격성이 악화되기 때문이다.It is preferable to add 0.5 to 1.5% of Mn because the impact value increases when the content is less than 0.5%, but the hardness decreases, and when more than 1.5%, the impact resistance deteriorates.

P와 S는 각각 그 함량이 0.02％보다 많으면, 내부결함이 많아지고, 내충격성이 감소하기 때문에, 각각 0.02％ 이하로 제한하는 것이 바람직하다.If the content of P and S is more than 0.02%, the number of internal defects increases and the impact resistance decreases. Therefore, the content of P and S is preferably limited to 0.02% or less, respectively.

Ni는 그 함량이 1％ 미만이면, 입자미세화 효과가 저하되어 경도가 좋지 않고, 2％ 보다 많으면, 고용강화 효과가 저하되어 경도향상에 도움이 되지 않기 때문에, 1~2％로 첨가하는 것이 바람직하다.If the content of Ni is less than 1%, the particle fineness effect is lowered and the hardness is not good. If the content of Ni is more than 2%, the solid solution strengthening effect is lowered and it does not help to improve the hardness, so it is preferably added at 1 to 2%. Do.

Cr은 고온에서의 내식성을 유지시켜 주는 가장 중요한 인자로서, 그 함량이 15％ 미만이면, 내식성이 좋지 않고, 30％ 보다 많더라도 내식성 향상에는 도움이 되지 않기 때문에, 15~30％로 첨가한느 것이 바람직하다.Cr is the most important factor for maintaining the corrosion resistance at high temperature. If the content is less than 15%, the corrosion resistance is not good, and even if more than 30%, it does not help to improve the corrosion resistance. It is preferable.

본 발명에서는, 탄화물형성에 의한 고온에서의 경도향상으로 내열 및 내마모특성을 증가시키기 위해, 상기와 같이 조성된 그레이트바에 B, Mo, W을 첨가하고, Nb, V 및 Ti으로 이루어지는 그룹 중 1종 또는 2종 이상을 첨가한다.In the present invention, in order to increase the heat resistance and abrasion resistance by improving the hardness at high temperature due to carbide formation, B, Mo, W is added to the above-described Great Bar, and 1 of the group consisting of Nb, V, and Ti Add species or two or more.

B은 그 함량이 0.1％ 미만이면, 탄화물형성 효과가 저하되고, 2％를 초과하면, 탄화물형성 효과가 미미하기 때문에, 0.1~2％로 첨가하는 것이 바람직하다.If the content of B is less than 0.1%, the carbide forming effect is lowered, and if it is more than 2%, the carbide forming effect is insignificant. Therefore, it is preferable to add B at 0.1 to 2%.

Mo는 그 함량이 0.5％ 미만이면, 경도상승 효과가 적고, 1.5％를 초과하면, 경도는 증가하나 충격치가 감소하기 때문에, 0.5~1.5％로 첨가하는 것이 바람직하다.If the content of Mo is less than 0.5%, the effect of increasing the hardness is small. If the content is more than 1.5%, the hardness increases, but the impact value decreases. Therefore, Mo is preferably added at 0.5 to 1.5%.

W는 그 함량이 0.2％ 미만이면, 탄화물형성에 의한 경도향상 효과가 저하되어 경도가 좋지 않고, 1.3％를 초과하면, 충격성이 저하되고, 가격이 비싸지기 때문에, 0.2~1.3％로 첨가하는 것이 바람직하다.When the content of W is less than 0.2%, the hardness improvement effect due to carbide formation is lowered and the hardness is not good. When W is more than 1.3%, the impact resistance is lowered and the price is expensive. desirable.

Nb, V 및 Ti는 그 함량이 각각 0.2~1.5％인 것이 바람직하다. 상기 원소들이 각각 0.2％ 미만으로 참가되면, 탄화물형성에 의한 경도향상 효과가 적고, 1.5％ 보다 많이 첨가되면, 함량 증가에 따른 효과의 상승을 기대할 수 없기 때문에 바람직하지 않다.Nb, V and Ti are preferably 0.2 to 1.5% in their content, respectively. If each of the elements participates in less than 0.2%, it is not preferable because the effect of improving the hardness due to carbide formation is small, and if more than 1.5% is added, the effect of increasing the content cannot be expected.

이하, 실시예를 통해 본 발명을 보다 상세히 설명한다Hereinafter, the present invention will be described in more detail with reference to Examples.

실시예Example

상기 표 1을 참조하면, 발명예 1∼3의 경우는 고온 강도가 125∼140HV로서, 종례예, 비교예들에 비하여 매우 높은 경도값을 나타내, 내열 및 내마모성이 우수한 것을 알수 있다.Referring to Table 1, in the case of Inventive Examples 1 to 3, the high temperature strength is 125 to 140 H V , which shows a very high hardness value compared to the case examples and the comparative examples, and it is understood that the heat resistance and the wear resistance are excellent.

본 발명에 따르면, 내열성 및 내마모성이 우수한 그레이트바가 제공됨에 따라 그레이트바의 사용 수명이 높아져, 그 교체에 소요되었던 자재비 및 정비비 등이 대폭 절감되는 효과가 있다.According to the present invention, as the great bar having excellent heat resistance and abrasion resistance is provided, the service life of the great bar is increased, and the material cost and maintenance cost required for the replacement are greatly reduced.

Claims (1)

중량％로, C:1~2.5％, Mn:0.5~1.5％, P:0.02％이하, S:0.02％이하, Si:0.5~2％, Ni:1~2％, Cr:15~30％, B:0.1-2％, Mo:0.5~1.5％, W:0.2~1.3％를 함유하고, 여기에 Nb:0.2~1.5％, V:0.2~1.5％ 및 Ti:0.2~1.5％으로 이루어지는 그룹중 1종 또는 2종 이상이 추가로 함유되고, 잔부 Fe 및 기타 불가피한 불순물로 구성되는 내열 및 내마모 특성이 우수한 그레이트바.By weight%, C: 1-2%, Mn: 0.5-1.5%, P: 0.02% or less, S: 0.02% or less, Si: 0.5-2%, Ni: 1-2%, Cr: 15-30% , B: 0.1-2%, Mo: 0.5-1.5%, W: 0.2-1.3%, where Nb: 0.2-1.5%, V: 0.2-1.5% and Ti: 0.2-1.5% A great bar which further contains 1 type (s) or 2 or more types, and is excellent in the heat and abrasion resistance property which consists of remainder Fe and other unavoidable impurities.
KR1020010083015A 2001-12-21 2001-12-21 Grate ber with superior heat and wear resistance KR20030052885A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100600036B1 (en) * 2004-12-21 2006-07-13 재단법인 포항산업과학연구원 A Jaw Plate with Imporved Wear Resisitance
WO2008111717A1 (en) * 2007-03-12 2008-09-18 Iucf-Hyu Fe based alloy having corrosion resistance and abrasion resistance and preparation method thereof
CN104775076A (en) * 2015-03-25 2015-07-15 江苏南山冶金机械制造有限公司 Perforator guide plate and manufacturing method thereof
KR20200011748A (en) 2018-07-25 2020-02-04 안동대학교 산학협력단 Thermal spraying powder, method of forming a thermal sprayed coating layer using the same and Grate bar with thermally sprayed coating layer

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100600036B1 (en) * 2004-12-21 2006-07-13 재단법인 포항산업과학연구원 A Jaw Plate with Imporved Wear Resisitance
WO2008111717A1 (en) * 2007-03-12 2008-09-18 Iucf-Hyu Fe based alloy having corrosion resistance and abrasion resistance and preparation method thereof
CN104775076A (en) * 2015-03-25 2015-07-15 江苏南山冶金机械制造有限公司 Perforator guide plate and manufacturing method thereof
KR20200011748A (en) 2018-07-25 2020-02-04 안동대학교 산학협력단 Thermal spraying powder, method of forming a thermal sprayed coating layer using the same and Grate bar with thermally sprayed coating layer

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