KR100380727B1 - Wear resistance plate for hot rolled coil side guide - Google Patents

Wear resistance plate for hot rolled coil side guide Download PDF

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Publication number
KR100380727B1
KR100380727B1 KR1019960069472A KR19960069472A KR100380727B1 KR 100380727 B1 KR100380727 B1 KR 100380727B1 KR 1019960069472 A KR1019960069472 A KR 1019960069472A KR 19960069472 A KR19960069472 A KR 19960069472A KR 100380727 B1 KR100380727 B1 KR 100380727B1
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South Korea
Prior art keywords
hot rolled
less
side guide
rolled coil
wear resistance
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KR1019960069472A
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Korean (ko)
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KR19980050635A (en
Inventor
심상대
진원
이치규
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주식회사 포스코
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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
    • C21D8/0226—Hot rolling
    • 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
    • C22C38/004—Very low carbon steels, i.e. having a carbon content of less than 0,01%
    • 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
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/005—Ferrite
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/009—Pearlite

Abstract

PURPOSE: A wear resistance plate for hot rolled coil side guide is provided which is less worn out and capable of improving coiling shape of hot rolled coil. CONSTITUTION: In a work for side guide plate(5) installed between hot rolling mill and down coiler to guide side of hot rolled strip(1) led in the down coiler, the wear resistance plate for hot rolled coil side guide is characterized in that the work comprises 0.1 wt.% or less of C, 0.01 to 0.48 wt.% of Si, 0.23 to 1.4 wt.% of Mn, 0.03 wt.% or less of P, 0.03 wt.% or less of S and a balance of Fe and inevitable impurities, wherein carbon content of the work is 0.2% or less, structure of the work has polygonal ferrite and pearlite of high temperature phase, volume fraction of the pearlite is in the range of 13.2 to 14.8%, and wherein the wear resistance steel has 78 KJ/m¬2 or more of impact energy and 38.4% or more of elongation.

Description

열연코일 측면가이드용 내마모판Abrasion Resistant Plates for Hot Rolled Coil Side Guides

본 발명은 열연코일을 권취할 때 열연판을 안내하는 측면가이드판에 관한 것으로, 보다 상세하게는 열연코일의 에지부 마모 발생을 억제할 수 있는 측면가이드용 내마모판(wear plate)에 관한 것이다.The present invention relates to a side guide plate for guiding a hot rolled plate when the hot rolled coil is wound, and more particularly, to a wear plate for a side guide that can suppress the occurrence of edge wear of the hot rolled coil. .

일반으로 열간압연에서부터 권취까지의 공정은, 제1도와 같이, 강슬라브를 조압연기(2)를 통해 일정두께의 바(bar)로 압연한 다음, 사상압연기(3)에 의해 마무리열간압연하고, 열간압연된 강판(1)은 측면가이드판(5)에 의해 안내되어 하부권취기(4)를 통해 열연코일로 권취하는 공정으로 이루어진다. 상기 측면가이드판(5)은 열연판(1)이 하부권취기(4)에서 일정형상을 유지한 채 권취되도록 인입되는 열연판(1)의 양측면을 안내하는 역할을 하는데, 이때 측면가이드판은 열연판과 계속적인 접촉으로 인해 마모가 심할 수 있다. 특히, 열연권취공정에서는 일반강, 스테인레스강 등 다양한 강종이 거치게 되기 때문에 강종에 따라 그 마모 정도도 크게 달라질 수 있다. 보다 중요한 것은 측면가이드판의 마모를 방지하기 위해서 경도가 큰 소재를 사용하면 반대로 열연제품의 에지부에서 마모가 발생되어 제품에 손상을 입히게 되기 때문에 측면가이드판은 열연판과의 상대적인 마모 특성을 고려해야 한다. 예를들면, 일반강 대비 강도가 낮은 스테인레스강을 열연권취시 측면가이드판 또는 열연판 에지부에서는 칩(chip) 형태의 결함이 생기면 상기 칩들이 열연코일내에 인입되어 권취코일의 형상을 불균일하게 하는 문제가 있다.In general, the process from hot rolling to winding is performed by rolling the steel slab to a bar having a predetermined thickness through the rough rolling mill 2, as shown in FIG. 1, and then finishing hot rolling by the finishing mill 3, Hot rolled steel sheet (1) is guided by the side guide plate (5) consists of a process of winding with a hot rolled coil through the lower winding machine (4). The side guide plate (5) serves to guide both sides of the hot rolled plate (1) is drawn so that the hot rolled sheet (1) is wound while maintaining a constant shape in the lower winding machine (4), the side guide plate Continuous contact with the hot rolled sheet can cause severe wear. In particular, in the hot rolled winding process, since various steel grades, such as general steel and stainless steel, pass through, the degree of wear may vary greatly depending on the steel grade. More importantly, when a hard material is used to prevent wear of the side guide plate, the side guide plate should consider the wear characteristics relative to the hot rolled plate because the wear occurs at the edge of the hot rolled product. do. For example, in the case of hot-rolled stainless steel having a lower strength than general steel, if chip-shaped defects occur in the side guide plate or hot-rolled sheet edge, the chips are introduced into the hot-rolled coil to uneven shape of the coil. there is a problem.

한편, 종래에는 상기 측면가이드부재로서 주로 SS400 강종을 사용하였는데, 상기 강종은 다양한 열연판을 권취하는 과정에서 열연판의 양측의 마모량을 크게 하고 그 마모형상도 거칠어지는 이상마모가 발생하곤 하였다.On the other hand, conventionally used SS400 steel grade as the side guide member, the steel type used to increase the amount of wear on both sides of the hot-rolled sheet in the process of winding various hot-rolled plate and the abnormal wear that the wear shape is also rough.

이에 본 발명은 기존의 측면가이드부재 대신 열연판과 가이드부재와의 상대마모량을 고려하여 다양한 열연판의 종류에 관계없이 제품과 측면가이드부재에 모두 마모이 적도 마모형상이 부드러운 새로운 내마모판을 제공하는데 그 목적이 있다.Therefore, the present invention provides a new wear-resistant plate having a soft wear shape with low wear on both the product and the side guide member, regardless of the type of the various hot rolled plates in consideration of the relative wear amount between the hot rolled plate and the guide member instead of the existing side guide member. The purpose is.

도1은 열간압연기의 개략 구성도1 is a schematic configuration diagram of a hot rolling mill

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

1.....열연판 2.....조압연기1 ..... hot rolled plate 2 ..... crude rolling mill

3.....사상압연기 4.....하부권취기3 ..... Three rolling mill 4 ..... lower winding machine

5.....측면가이드판5 ..... Side guide plate

상기 목적달성을 위한 본 발명은 열간압연기와 권취기 사이에 설치되어 권취기에 인입되는 열연판의 측면을 안내하는 측면가이드판용 소재에 있어서,In the present invention for achieving the above object in the material for the side guide plate is installed between the hot rolling mill and the winder to guide the side of the hot rolled plate introduced into the winder,

상기 소재는 중량%로, C: 0.1%이하, Si: 0.01-0,48%, Mn. 0.23·-1.4%, P: 0.03%이하, S: 0.03%이하, 및 잔부는 Fe와 불가피한 불순물로 조성되며, 탄소당량이 0.2%이하이고, 또한 그 조직은 고온상의 폴리고널 페라이트(polygonal ferrite)와 펄라이트를 갖고, 상기 펄라이트의 부피분율이 13.2-14.8% 범위인 열연코일측면가이드용 내마모판에 관한 것이다.The material is by weight, C: 0.1% or less, Si: 0.01-0,48%, Mn. 0.23 · -1.4%, P: 0.03% or less, S: 0.03% or less, and the balance is composed of Fe and unavoidable impurities, the carbon equivalent is 0.2% or less, and the structure is a high-temperature polygonal ferrite It relates to a wear-resistant plate for hot-rolled coil side guides having a pearlite and a volume fraction of the pearlite in the range of 13.2-14.8%.

이하, 본 발명에 대하여 상세히 설명한다.EMBODIMENT OF THE INVENTION Hereinafter, this invention is demonstrated in detail.

우선, 본 발명의 내마모판은 탄소강을 기본으로 하는데, 소재내에 함유되는 탄소 성분은 0.1중량%(이하, 단지 '%')이하가 바람직하다. 소재내의 탄소함량이 증가하면 경도와 강도가 향상되지만 0.1%이상인 경우에는 오히려 마모량이 커져 바람직하지 않다.First, the wear-resistant plate of the present invention is based on carbon steel, and the carbon component contained in the material is preferably 0.1% by weight or less (hereinafter, only '%'). Increasing the carbon content in the material improves the hardness and strength, but in the case of 0.1% or more, the wear amount is rather large, which is not preferable.

또한, 실리콘은 0.01-0.48% 정도가 바람직한데, 그 이유는 Si 함유량이 0.01%미만이면 소재내에 적층결함에너지(stacking fault energy)가 증가되어 크로스슬립(cross slip)에 의해 인장강도가 작아지고, 0.48%이상이면 인성이 작아지기 때문이다.In addition, silicon is preferably about 0.01-0.48%, because if the Si content is less than 0.01%, the stacking fault energy is increased in the material, and the tensile strength is decreased by the cross slip. It is because toughness will become small when it is 0.48% or more.

또한, 망간의 함량이 1.4%이상이면 기지조직내의 탄소 용해도가 감소하여 망간탄화물 석출에 의한 입계취화가 일어나고, 0.23%미만이면 저온 인성이 저하되어 바람직하지 않다.In addition, if the content of manganese is 1.4% or more, the carbon solubility in the matrix structure is reduced, grain boundary embrittlement due to precipitation of manganese carbide occurs, and if less than 0.23%, low-temperature toughness is lowered, which is not preferable.

또한, 상기 인 이나 황은 강중 불가피하게 함유되는 불순원소로서, 그 함량이 많아지면 소재내 균열이 발생할 수 있기 때문에 가능한 한 0.03%이하로 억제함이 바람직하다.In addition, the phosphorus or sulfur is an impure element that is inevitably contained in the steel, it is preferable to suppress as much as possible 0.03% or less because the content in the material may cause cracks.

또한, 탄소당량이 0.2%이상인 경우 소재의 마모량이 급격히 증가될 수 있기 때문에 탄소당량은 0.2%이하로 제한함이 바람직하다.In addition, when the carbon equivalent is more than 0.2%, since the wear amount of the material can be sharply increased, the carbon equivalent is preferably limited to 0.2% or less.

한편, 본 발명의 내마모판은 상기한 조성범위를 만족하면서 그 조직이 고온상의 폴리고널 페라이트(polygonal ferrite)와 펄라이트로 이루어진 탄소강이 바람직하다. 이때 상기 펄라이트(pearlite)의 부피분율은 약 13.2-14.8% 정도로 포함되는 것이 보다 바람직한데, 만일 펄라이트의 부피분율이 13.2%미만이면 상대적으로 폴리고널 페라이트의 분율이 적어져 취화되어 열연코일에 의해 측면가이드판의 손상정도가 심화되어 바람직하지 않다. 또한 펄라이트의 부피분율이 약 14.8%을 초과하면 경도가 증가되고 이에 따라 열연코일판에 마모가 심화되어 바람직하지 않다.On the other hand, the wear-resistant plate of the present invention preferably satisfies the above composition range, the carbon steel is composed of a high-temperature polygonal ferrite and pearlite. At this time, the volume fraction of pearlite (pearlite) is more preferably included about 13.2-14.8%. If the volume fraction of pearlite is less than 13.2%, the fraction of polygonal ferrite is relatively small and is embrittled to form a side by hot rolled coil. The degree of damage of the guide plate is deepened, which is undesirable. In addition, when the volume fraction of the pearlite exceeds about 14.8%, the hardness is increased, thereby increasing wear on the hot rolled coil plate, which is not preferable.

이와같은 내마모판은 충격에너지가 78KJ/㎡이상, 연신율이 38.4%이상을 유지한다.Such abrasion resistant plates have an impact energy of 78KJ / ㎡ or more and an elongation of 38.4% or more.

이하, 본 발명을 실시예를 통해 구체적으로 설명한다.Hereinafter, the present invention will be described in detail through examples.

[실시예]EXAMPLE

표1과 같은 조성 및 물성을 갖는 3종류의 강을 이용하여 가이드판을 제작하고, 이를 열간압연기와 권취기 사이에 설치한 다음, 각 열연권취를 실시한 후의 각가이드판에 대한 마모정도를 살펴보았다.The guide plate was made by using three kinds of steels having the composition and physical properties as shown in Table 1, installed between the hot rolling mill and the winding machine, and the wear degree of each guide plate after each hot rolling was examined. .

[표 1]TABLE 1

상기표1에 나타난 바와 같이, 기존의 강종을 사용한 가이드판에 비해 본 발명강을 사용한 가이드판의 경우 마모량이 매우 적음을 알 수 있었다.As shown in Table 1, it was found that the amount of wear is very small in the case of the guide plate using the present invention steel compared to the guide plate using the existing steel species.

상술한 바와 같이, 본 발명의 내마모판은 기존의 측면가이드판 소재에 비하여 열연판과 가이드판의 상대마모량이 적어 다양한 열연판이 권취되는 경우에도 열간압연기의 후단에 설치되는 측면가이드판의 수명이 연장될 수 있을 뿐만아니라 무엇보다도 정확한 가이드역할로 열연코일의 권취형상을 일정하게 유지하면서도 칩형태의 개재물에 의한 권취조업불량을 크게 감소할 수 있는 효과가 있다.As described above, the wear-resistant plate of the present invention has a relative wear amount between the hot rolled plate and the guide plate as compared with the conventional side guide plate material, so that even if various hot rolled plates are wound, the life of the side guide plate installed at the rear end of the hot rolling mill Not only can it be extended, but above all, the winding guide of the hot rolled coil can be kept constant by the accurate guide role, and the winding operation failure by the chip-shaped inclusions can be greatly reduced.

Claims (2)

열간압연기와 권취기 사이에 설치되어 권취기에 인입되는 열연판의 측면을 안내하는 측면가이드판용 소재에 있어서,In the material for the side guide plate installed between the hot rolling mill and the winding machine to guide the side surface of the hot rolled sheet drawn into the winding machine, 상기 소재는 중량%로, C: 0.1%이하, Si: 0.01-0.48%, Mn: 0.23-1.4%, P: 0.03%이하, S: 0.03%이하, 및 잔부는 Fe와 불가피한 불순물로 조성되며, 탄소함량이 0.2%이하이고, 또한 그 조직은 고온상의 폴리고널 페라이트(polygonal ferrite)와 펄라이트를 갖고, 상기 펄라이트의 부피분율이 13.2-14.8% 범위임을 특징으로 하는 열연코일 측면가이드용 내마모판The material is by weight, C: 0.1% or less, Si: 0.01-0.48%, Mn: 0.23-1.4%, P: 0.03% or less, S: 0.03% or less, and the balance is composed of Fe and inevitable impurities, The carbon content is 0.2% or less, and its structure has a high-temperature polygonal ferrite and pearlite, and the volume fraction of the pearlite is 13.2-14.8%. 제1항에 있어서, 상기 내마모강은 충격에너지가 78KJ/㎡이상이고, 연신율이 38.4%이상임을 특징으로 하는 내마모판The wear resistant plate according to claim 1, wherein the wear resistant steel has an impact energy of 78 KJ / m 2 or more and an elongation of 38.4% or more.
KR1019960069472A 1996-12-21 1996-12-21 Wear resistance plate for hot rolled coil side guide KR100380727B1 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100954201B1 (en) 2007-12-24 2010-04-21 주식회사 포스코 Hot-rolled steel sheet superior in tensile strength and elongation and manufacturing method thereof

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5544551A (en) * 1978-09-25 1980-03-28 Nippon Steel Corp Production of low yield ratio high tension hot rolled steel plate of superior ductility
JPH06200351A (en) * 1992-12-28 1994-07-19 Kobe Steel Ltd High strength hot rolled steel plate excellent in stretch-flange formability

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5544551A (en) * 1978-09-25 1980-03-28 Nippon Steel Corp Production of low yield ratio high tension hot rolled steel plate of superior ductility
JPH06200351A (en) * 1992-12-28 1994-07-19 Kobe Steel Ltd High strength hot rolled steel plate excellent in stretch-flange formability

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100954201B1 (en) 2007-12-24 2010-04-21 주식회사 포스코 Hot-rolled steel sheet superior in tensile strength and elongation and manufacturing method thereof

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