KR100344531B1 - Composition for manufacturing bolts/nuts for KP mechanical joint and bolts /nuts thereof - Google Patents

Composition for manufacturing bolts/nuts for KP mechanical joint and bolts /nuts thereof Download PDF

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KR100344531B1
KR100344531B1 KR1020000064728A KR20000064728A KR100344531B1 KR 100344531 B1 KR100344531 B1 KR 100344531B1 KR 1020000064728 A KR1020000064728 A KR 1020000064728A KR 20000064728 A KR20000064728 A KR 20000064728A KR 100344531 B1 KR100344531 B1 KR 100344531B1
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nuts
bolts
composition
weight
bolt
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KR20010007995A (en
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서지홍
민호진
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주식회사 하이테크화스너
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    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/18Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/42Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/04Ferrous alloys, e.g. steel alloys containing manganese
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/02Ferrous alloys, e.g. steel alloys containing silicon

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatment Of Articles (AREA)
  • Mutual Connection Of Rods And Tubes (AREA)

Abstract

본 발명은 케이피(KP) 미케니칼 조인트용 볼트/너트 제조용 조성물 및 그 볼트/너트에 관한 것으로, 탄소 0.20중량% 이하, 망간 1.25중량% 이하, 유황 0.05중량% 이하, 크롬 0.8중량% 이상, 니켈 0.25중량% 이상, 구리 0.20중량% 이상의 조성에 나머지가 철로 구성되며 이 조성물을 케이피(KP) 미케니칼 조인트용 볼트/너트로 제조하여 사용할 경우 우수한 내식성을 유지하며 기존 구상흑연주철재 볼트/너트보다 기계가공성과 기타 기계적 성질을 용이하게 할 수 있는 뛰어난 효과가 있다.The present invention relates to a composition for manufacturing bolts / nuts for KP mechanical joints and bolts / nuts thereof, wherein the carbon content is 0.20% by weight or less, manganese 1.25% by weight, sulfur 0.05% by weight, chromium 0.8% by weight, Nickel 0.25% by weight or more, 0.20% by weight of copper, the remainder is composed of iron, and the composition is used as a bolt / nut for KP mechanical joints to maintain excellent corrosion resistance. It has a superior effect to facilitate machinability and other mechanical properties than nuts.

Description

케이피 미케니칼 조인트용 볼트/너트 제조용 조성물 및 그 볼트/너트 {Composition for manufacturing bolts/nuts for KP mechanical joint and bolts /nuts thereof}Composition for manufacturing bolts / nuts for KP mechanical joint and bolts / nuts}

본 발명은 케이피(KP) 미케니칼 조인트(mechanical joint)용 볼트/너트 제조용 조성물 및 그 볼트/너트에 관한 것으로, 더욱 상세하게는 우수한 내식성을 유지하며 기존 구상흑연주철재 볼트/너트보다 기계가공성과 기타 기계적 성질을 용이하게 할 수 있는 케이피 미케니칼 조인트용 볼트/너트 제조용 조성물 및 그 볼트/너트에 관한 것이다.The present invention relates to a composition for manufacturing bolts / nuts for KP mechanical joints and their bolts / nuts, and more particularly, to maintains excellent corrosion resistance and is more machinable than conventional nodular cast iron bolts / nuts. And a composition for manufacturing bolts / nuts for captive mechanical joints which can facilitate the mechanical properties and other bolts / nuts thereof.

일반적으로, 지중(땅속) 또는 지상에 배관하여 압력 또는 무압력에서 상수도, 공업용수도, 농업용 수도, 하수도 등과 같이 물의 수송에 사용되는 관으로는 덕타일 주철관(ductile iron pipe)이 통상 사용된다.In general, a ductile iron pipe is generally used as a pipe used for transporting water such as tap water, industrial water, agricultural water, sewage, etc. under pressure or no pressure by pipe to ground or in the ground.

그러나, 이러한 덕타일 주철관은 해안지역 및 습지배관시 전식, 부식이 발생하였으며 중량이 무거운 등 내식성, 작업성 및 경제성 등에서 많은 단점이 있었다.However, these ductile cast iron pipes have a number of disadvantages in corrosion resistance, workability and economic efficiency such as corrosion and corrosion occurred in the coastal area and wetland piping.

이에 따라, 이러한 덕타일 주철관과는 그 용도는 동일하면서 그 단점인 내식성, 작업성 및 경제성을 개선할 수 있도록 개발된 배관으로 현재 수도용 폴리에틸렌관이 현재 널리 사용되고 있다.Accordingly, the use of the ductile cast iron pipe is the same, but the pipe is developed to improve the corrosion resistance, workability and economical disadvantages of the current polyethylene pipe for water is currently widely used.

이러한 수도용 폴리에틸렌관은 KP식 폴리에틸렌 직관 연결부 및 접합부속, 압륜, 고무링, 볼트, 너트로 이루어진 부품들로 배관된다. 배관작업은 먼저 파이프 끝부분에 압륜과 고무링을 끼우고 직관 연결부에 삽입할 파이프를 삽입한 후, 고무링과 압륜을 직관 연결부에 밀착시킨 다음 직관 연결부와 압륜을 결합하여 복스렌지로 압착시키면 배관이 완료된다.This water polyethylene pipe is piped with parts consisting of KP type polyethylene straight pipe connection and joint, pressure ring, rubber ring, bolt, nut. For pipe work, first, insert the pressure ring and rubber ring at the end of the pipe, insert the pipe to be inserted into the straight pipe connection part, and then close the rubber ring and the pressure wheel to the straight pipe connection part, and then combine the straight pipe connection part and the pressure ring and compress it with a box range. Is complete.

이러한 배관작업시 사용되는 볼트 및 너트는 통상 FCD 재질로 이루어져 있다. FCD란 구상흑연주철(Spheroidal graphite cast iron)로서, 주철(Fe)에 마그네슘 (Mg)이나 코발트(Co)를 미량 첨가함으로써 흑연을 구상화한 것으로 특히 강에 가까운 성질을 가지고 있다.Bolts and nuts used in such piping work is usually made of FCD material. FCD is spheroidal graphite cast iron, which spheroidized graphite by adding a small amount of magnesium (Mg) or cobalt (Co) to cast iron (Fe), and is particularly close to steel.

그러나, 기존 사용하던 구상흑연주철재 볼트/너트(FCD 2종)는 다음과 같은 문제점이 있다.However, the existing spherical graphite cast iron bolts / nuts (FCD 2 types) have the following problems.

먼저 상기 볼트/너트는 사형 주조물로 내부외부 결함 발생의 빈도가 높고, 나사산의 정밀도, 조도에 의한 내외부 결함으로 인한 가공성이 불량하다. 또한, 주물기술에 의해 로트별 차이가 커져 강도가 일정치 않으며 강도가 필요이상으로 높은 문제점이 있다. 또한, 외부충격, 측압, 인장시 외력에 약하며 온도변화에 따른 적응성이 떨어진다. 또한, 생산단가가 높으므로 비경제적이며, 너트 체결시 볼트의 산이 뭉그러짐 발생과다로 볼트 조립시 작업자의 숙련도에 따른 불량 발생빈도가 높은 문제점이 있었다.First, the bolts / nuts are sand castings, which have a high frequency of internal and external defects, and are poor in workability due to internal and external defects due to thread accuracy and roughness. In addition, the difference between the lot by the casting technology increases the strength is not constant, there is a problem that the strength is higher than necessary. In addition, it is weak to external force during external impact, side pressure and tension, and is inadequate to temperature change. In addition, the production cost is high, it is uneconomical, there is a problem that the occurrence of defects according to the skill of the operator when assembling the bolt due to excessive generation of the acid of the bolt when tightening the nut.

본 발명은 종래의 이와 같은 문제점들을 감안하여 안출한 것으로, 우수한 내식성을 유지하며 기존 구상흑연주철재 볼트/너트보다 기계가공성과 기타 기계적 성질을 용이하게 할 수 있는 케이피 미케니칼 조인트용 볼트/너트 제조용 조성물을 제공하는데 그 목적이 있다.The present invention has been made in view of the above-described problems of the prior art, and maintains excellent corrosion resistance and bolt / nut for KP mechanical joints that can facilitate the machinability and other mechanical properties than the existing spherical graphite cast iron bolt / nut It is an object to provide a composition for preparation.

본 발명의 다른 목적은 상기 조성물로 제조될 수 있는 케이피 미케니칼 조인트용 볼트/너트를 제공하는데 있다.It is another object of the present invention to provide a bolt / nut for a KP mechanical joint that can be prepared from the composition.

본 발명의 상기 목적은 탄소 0.20중량% 이하, 망간 1.25중량% 이하, 유황 0.05중량% 이하, 크롬 0.8중량% 이상, 니켈 0.25중량% 이상, 구리 0.20중량% 이상의 조성에 나머지가 철로 구성되는 케이피 미케니칼 조인트용 볼트/너트 제조용 조성물을 제공함으로써 달성될 수 있다.The above object of the present invention is a cape rice composed of 0.20% by weight of carbon, 1.25% by weight of manganese, 0.05% by weight of sulfur, 0.8% by weight of chromium, 0.25% by weight of nickel and 0.20% by weight of copper. It can be achieved by providing a composition for making bolts / nuts for chemical joints.

본 발명의 다른 목적은 우수한 내식성을 유지하며 기존 구상흑연주철재 볼트/너트보다 기계가공성과 기타 기계적 성질을 용이하게 할 수 있는 케이피 미케니칼 조인트용 볼트/너트를 제공함으로써 달성될 수 있다.Another object of the present invention can be achieved by providing bolt / nuts for KP mechanical joints that can maintain excellent corrosion resistance and can facilitate machinability and other mechanical properties than existing spherical graphite cast iron bolts / nuts.

이하, 본 발명의 구체적인 구성 및 작용 효과를 설명하지만 본 발명의 권리범위는 본 발명 케이피 미케니칼 조인트용 볼트/너트 제조용 조성물을 구성하는 성분의 종류와 수치를 변경하는 것에도 미치는 것은 물론이다.Hereinafter, although the specific structure and effect of this invention are demonstrated, it is a matter of course that the scope of the present invention also changes the kind and numerical value of the component which comprise the composition for manufacturing the bolt / nut for KP mechanical joint of this invention.

이하, 본 발명의 케이피 미케니칼 조인트용 볼트/너트 조성물의 구성을 설명하기로 한다.Hereinafter, the structure of the bolt / nut composition for KP mechanical joint of this invention is demonstrated.

본 발명 케이피 미케니칼 조인트용 볼트/너트 조성물과 종래 FCD 재질의 볼트/너트의 화학성분을 하기 표 1을 통해 살펴보면 다음과 같다.Looking at the chemical composition of the bolt / nut composition for the KPK mechanical joint and the bolt / nut of the conventional FCD material as follows.

화학성분(조성) 비교표Chemical composition (composition) comparison table 화학성분(%)Chemical composition (%) 비고Remarks CC SiSi MnMn PP SS CrCr CuCu NiNi 본 발명The present invention AWWA11-8.5AWWA11-8.5 0.20이하0.20 or less -- 1.25이하1.25 and below -- 0.05이하0.05 or less 0.8이상0.8 or more 0.2이상0.2 or more 0.25이상0.25 or more Cr+Cu+Ni=1.25 이상Cr + Cu + Ni = 1.25 or more FCDFCD 0종0 species KSD 4302KSD 4302 2.5이상2.5 or more 2.5이하2.5 or less 0.4이하0.4 or less 0.08이하Less than 0.08 0.02이하0.02 or less -- -- -- 참고Reference 1∼6종1 to 6 types 2.5이상2.5 or more -- -- -- 0.02이하0.02 or less -- -- -- 기존사용볼트(FCD 2종)Conventional Bolts (FCD Type 2) [참고] AWWA : 미국수도협회, American Water Works Association[Reference] AWWA: American Water Works Association

본 발명의 조성물은 상기 표 1에 기재한 바와 같이 필수조건 (그 물건의 구분)을 나타내는 기본적인 구성요소 (원소)로 표시되며, 철(Fe)이 주성분이며 최대 함량원소로서 C, Mn, S, 최소 함량원소로 Cr, Ni, Cu를 함유하며, 바람직한 원료성분으로서 탄소 0.20중량%, 망간 1.25중량%, 유황 0.05중량%, 크롬 0.8중량%, 니켈 0.25중량%, 구리 0.20중량% 및 철 97.25중량%을 함유하는 것이 바람직하다. 기타 가스나 불순물 함유량은 그 자체 성질에 커다란 영향을 주지 않으므로 표시하지 않는다.The composition of the present invention is represented by the basic components (elements) showing the essential conditions (classification of the article) as shown in Table 1, iron (Fe) is the main component and the maximum content element C, Mn, S, It contains Cr, Ni, and Cu as the minimum content elements, and is a preferred raw material as 0.20 wt% carbon, 1.25 wt% manganese, 0.05 wt% sulfur, 0.8 wt% chromium, 0.25 wt% nickel, 0.20 wt% copper, and 97.25 wt% iron. It is preferable to contain%. Other gas or impurity contents are not indicated because they do not significantly affect their own properties.

탄소(C)는 철강중 가장 중요한 원소로 그 함유량에 의해 철강의 성질이 대폭 좌우된다. 일반적으로 철의 인장강도와 내력은 탄소량의 증가에 따라 상승하지만 철의 신장과 비틀림 강도(torsional strength)는 역으로 감소하는 경향이 있다. 일반적으로 철에 있어서 담금질의 단단함은 0.8% 부근까지 탄소량의 증가에 따라 거의 비례적으로 상승하지만 그 이하는 변하지 않고 똑같은 값을 나타낸다.Carbon (C) is the most important element of steel and its properties greatly depend on its content. In general, the tensile strength and the strength of iron increase with the increase of carbon amount, but the elongation and torsional strength of iron tend to decrease inversely. In general, the hardening of iron hardens almost proportionally with the increase of the amount of carbon to around 0.8%, but the same does not change.

일반적으로 망간(Mn)은 필수적으로 담금질을 하여야 하는 원소이며, 규소(Si)는 제강의 과정에서 혼입되는 원소로 통상 현저한 영향은 인정되지 않는다.In general, manganese (Mn) is essentially an element to be quenched, and silicon (Si) is an element that is incorporated in the steelmaking process is usually not noticeable effects.

유황(S)이나 인(P)은 철강에 있어서 오히려 유해하다고 생각되는 원소로서 가능한 한 적게 함유하는 것이 바람직하다.It is preferable to contain sulfur (S) and phosphorus (P) as little as possible as an element considered to be rather harmful in steel.

본 발명의 특성원소로는 Cr, Cu, Ni이 있는데, 이들은 내식성을 강조하며 기계가공성과 기타 기계적 성질을 기존 FCD 볼트보다 용이하게 하기 위한 성분들이다.Characteristic elements of the present invention are Cr, Cu, Ni, these are the components to emphasize the corrosion resistance and to make the machinability and other mechanical properties easier than conventional FCD bolts.

이하, 본 발명의 구체적인 구성을 바람직한 실시예를 통하여 더욱 상세히 설명하지만, 이들 실시예는 본 발명을 설명하기 위한 것으로, 본 발명의 권리범위는 이들 실시예에 국한되지 않고, 제조공정의 순서 또는 수치의 변경에 의하여 당 업계에서 통상의 지식을 가진 자에게 있어서 얼마든지 변경될 수 있음은 물론이다.Hereinafter, the specific configuration of the present invention will be described in more detail with reference to preferred embodiments, but these embodiments are for explaining the present invention, the scope of the present invention is not limited to these embodiments, the order or numerical value of the manufacturing process Of course, it can be changed to those of ordinary skill in the art by the change of.

실시예 1. 케이피 미케니칼 조인트용 볼트/너트의 원소성분 조성Example 1 Elemental Composition of Bolts / Nuts for KP Mechanical Joint

원료성분으로 탄소 0.20중량%, 망간 1.25중량%, 유황 0.05중량%, 크롬 0.8중량%, 니켈 0.25중량%, 구리 0.20중량%, 철 97.25중량%를 혼합 조성하였다.0.20% by weight of carbon, 1.25% by weight of manganese, 0.05% by weight of sulfur, 0.8% by weight of chromium, 0.25% by weight of nickel, 0.20% by weight of copper, and 97.25% by weight of iron were mixed as raw materials.

실시예 2. 케이피 미케니칼 조인트용 볼트/너트의 제조Example 2. Fabrication of KP Mechanical Joint Bolts / Nuts

상기 실시예 1의 조성비율에 따라 조성된 조성물을 사용하여 통상의 열간성형 방법에 의하여 케이피 미케니칼 조인트용 볼트/너트를 제조하였다.Using the composition formulated according to the composition ratio of Example 1 to prepare a bolt / nut for KP mechanical joint by a conventional hot forming method.

실시예 3. 본 발명 제품의 기계적 특성 평가Example 3 Evaluation of Mechanical Properties of the Product of the Invention

상기 실시예 2에 따라 제조된 본 발명 케이피 미케니칼 조인트용 볼트/너트를 종래 제품들과 몇가지 기계적인 특성을 비교하여 제품 특성을 평가하였다(표 2, 표 3).The mechanical properties of the inventive KP mechanical joint bolts / nuts prepared according to Example 2 were compared with those of conventional products to evaluate product characteristics (Table 2 and Table 3).

인장강도(Ultimate tensile strength)는 어떤 재료를 당겨서 판단하는데 요하는 최대하중을 재료의 최초의 단면적으로 제한값을 말하는 것으로, 통상 재료의 강도를 나타내는 표준으로 하고 있으며 단위는 kgf/mm2또는 N/mm2로 나타내었다.Ultimate tensile strength is the limit of the initial cross-sectional area of a material to determine the maximum load required to pull a material and is usually a standard for indicating the strength of a material and is measured in kgf / mm 2 or N / mm. 2 .

내력 또는 내력강도(yield strength)는 인장시험에 있어서 항복점이 뚜렷이 나타나지 않는 재료에서는 적당한 영구변형 (보통 0.2%)를 일으켰을때의 하중을 원래의 단면적으로 나눈 값을 의미한다.Yield strength or yield strength is the value obtained by dividing the original cross section by the load at which a moderate permanent strain (usually 0.2%) is produced in a material where the yield point is not apparent in the tensile test.

연신율 또는 신율(elongation)은 재료의 인장시험을 할때 재료가 늘어나는 배율을 의미한다.Elongation or elongation refers to the rate at which the material stretches during the tensile test of the material.

경도 (hardness)는 물체의 기계적 경질과 연질의 정도를 나타내는 수치를 의미하며, 본 실시예에서는 브레넬 경도(BRINELL)인 HB로 나타내었다.Hardness means a numerical value representing the degree of mechanical hardness and softness of the object. In this embodiment, the hardness is denoted by HB, which is a BRINELL hardness.

기계적 성질 대비표Mechanical property comparison table 기호sign 인장시험Tensile test 참고경도 (HB)Reference Hardness (HB) 비 고Remarks 인장강도(N/mm2)Tensile Strength (N / mm 2 ) 내력 (N/mm2)Load capacity (N / mm 2 ) 연신율(%)Elongation (%) 본 발명The present invention 370 이상370 or more 310 이상310 or more 20 이상More than 20 52∼10052-100 FCD 2종FCD Type 2 GCD 450GCD 450 450 이상More than 450 280 이상280 or more 10 이상over 10 143∼217143-217 현재 사용중인 볼트Current bolt

종래 제품과 본 발명의 볼트/너트의 비교Comparison between the conventional product and the bolt / nut of the present invention 순위ranking 내 용Contents FCDFCD 본 발명The present invention 1One 외관(흠집 및 고스름, 이음매)Appearance (scratches and icing, seams) ×× 22 경제성 (소재/가공)Economic feasibility (material / processing) 33 부식성 (내식성)Corrosion (corrosion resistance) 44 가공성 및 정밀도Machinability and Precision ×× 55 생산방식Production method 사형주조Death Casting 열간성형Hot forming 66 내후성 (기후변화)Weatherability (Climate Change) 77 외부충격 (타격, 인장, 기타)External Shock (Strike, Seal, etc.) ×× 88 생산성 (대량생산)Productivity (Mass Production) 99 제품의 균일성 (로트별)Product uniformity (by lot) ×× [범례] ○: 양호 △: 보통 ×: 불량[Legend] ○: Good △: Normal ×: Poor

상기 특성비교 표 3에서 명백한 바와 같이, 본 발명의 케이피 미케니칼 조인트용 볼트/너트는 종래 FCD재 볼트/너트에 비하여 외관, 경제성, 가공성, 정밀도, 내충격성 등에서 모두 현저히 증가 향상되었음을 알 수 있다.As is apparent from Table 3, the KP mechanical joint bolt / nut of the present invention is significantly improved in appearance, economy, workability, precision, impact resistance, etc., compared to the conventional FCD material bolt / nut. .

이상에서 설명한 바와 같이, 본 발명에 따른 케이피 미케니칼 조인트용 볼트/너트는 종래의 FCD재 볼트/너트와 거의 동일한 내식성을 유지하면서도 기계가공성과 기타 기계적 성질을 개선시킬 수 있는 뛰어난 효과가 있으므로 상수도, 공업용수도, 농업용 수도, 하수도 등의 배관 산업상 매우 유용한 발명인 것이다.As described above, the KP mechanical joint bolt / nut according to the present invention has an excellent effect of improving machinability and other mechanical properties while maintaining almost the same corrosion resistance as conventional FCD material bolts / nuts. The invention is very useful in the piping industry, such as industrial water, agricultural water, sewage.

Claims (2)

탄소 0.20중량%, 망간 1.25중량%, 유황 0.05중량%, 크롬 0.8중량%, 니켈 0.25중량% 및 구리 0.20중량%의 조성에 나머지가 철로 구성됨을 특징으로 하는 케이피 미케니칼 조인트용 볼트/너트 제조용 조성물.For the manufacture of bolts / nuts for KP mechanical joints, characterized in that the remainder consists of iron in a composition of 0.20% carbon, 1.25% manganese, 0.05% sulfur, 0.8% chromium, 0.25% nickel and 0.20% copper. Composition. 삭제delete
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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59136443A (en) * 1983-07-25 1984-08-06 Hitachi Ltd Bolt material excellent in stress, corrosion, cracking resistance
JPH02156048A (en) * 1988-12-09 1990-06-15 Kawasaki Steel Corp Chromium steel excellent in corrosion resistance
KR950018584A (en) * 1993-12-24 1995-07-22 석진철 High toughness bolt steel and manufacturing method
JPH10195606A (en) * 1997-01-08 1998-07-28 Nippon Steel Corp Steel excellent in pickling adaptability and corrosion resistance
KR19990001314A (en) * 1997-06-13 1999-01-15 오오마쓰 세이이찌 Pressure Resistance Synthetic Resin Pipe

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59136443A (en) * 1983-07-25 1984-08-06 Hitachi Ltd Bolt material excellent in stress, corrosion, cracking resistance
JPH02156048A (en) * 1988-12-09 1990-06-15 Kawasaki Steel Corp Chromium steel excellent in corrosion resistance
KR950018584A (en) * 1993-12-24 1995-07-22 석진철 High toughness bolt steel and manufacturing method
JPH10195606A (en) * 1997-01-08 1998-07-28 Nippon Steel Corp Steel excellent in pickling adaptability and corrosion resistance
KR19990001314A (en) * 1997-06-13 1999-01-15 오오마쓰 세이이찌 Pressure Resistance Synthetic Resin Pipe

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