KR20000034395A - Ferrite type stainless steel excellent in toughness in welding unit - Google Patents

Ferrite type stainless steel excellent in toughness in welding unit Download PDF

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KR20000034395A
KR20000034395A KR1019980051724A KR19980051724A KR20000034395A KR 20000034395 A KR20000034395 A KR 20000034395A KR 1019980051724 A KR1019980051724 A KR 1019980051724A KR 19980051724 A KR19980051724 A KR 19980051724A KR 20000034395 A KR20000034395 A KR 20000034395A
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toughness
stainless steel
content
less
type stainless
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KR1019980051724A
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Korean (ko)
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최두열
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이구택
포항종합제철 주식회사
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Publication of KR20000034395A publication Critical patent/KR20000034395A/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
    • C22C38/001—Ferrous alloys, e.g. steel alloys containing N
    • 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
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
    • 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
    • C22C38/48—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

Abstract

PURPOSE: Ferrite type stainless steel is provided to improve the toughness in a welding unit by adding nickel without reducing the content of chromium and molybdenum. CONSTITUTION: A ferrite type stainless steel contains lower than 0.03wt% of carbon, 0.04wt% of nitrogen, 0.02wt% of oxygen, 1.0wt% of silicon, 1.0wt% of manganese, 0.03wt% of phosphorus, 0.5wt% of copper, 0.2wt% of aluminum, 5.0wt% of molybdenum, 1.0wt% of titanium-niobium, 18-30wt% of chromium and the rest such as iron and impurities. About 1.0-3.0wt% of nickel is added to the ferrite type stainless steel to enhance the toughness in a welding unit.

Description

용접부에서의 인성이 우수한 페라이트계 스테인레스강Ferritic stainless steel with excellent toughness in welds

본 발명은 페라이트계 스테인레스강에 관한 것이며, 특히, 용접부에서의 인성이 우수한 페라이트계 스테인레스강에 관한 것이다.The present invention relates to a ferritic stainless steel, and more particularly, to a ferritic stainless steel excellent in toughness at the weld.

일반적으로, 페라이트계 스테인레스강(ferrite type stainless steel)은 고가의 Ni을 함유하는 오스테나이트계 스테인레스강(austenite type stainless steel)에 비교해서 가격이 낮으면서, 내식성 및 응력부식균열 저항성이 우수하여 건자재, 구조재, 각종 부품 등으로 광범위하게 사용되고 있다. 또한, 페라이트계 스테인레스강은 용접부가 취약하여 기계적 강도 및 용접성이 그렇게 중요하지 않은 자동차부품 및 화학공업용 장치에는 많이 사용되지만 그 응용범위가 다소 제한적인 재료이다.In general, ferrite type stainless steel is lower in price compared to austenitic stainless steel containing expensive Ni, and has excellent corrosion resistance and stress corrosion cracking resistance. It is widely used for structural materials and various parts. In addition, ferritic stainless steel is a material that is widely used in automobile parts and chemical industry devices where the weld strength is weak and the mechanical strength and weldability are not so important, but its application range is somewhat limited.

이런 페라이트계 스테인레스강에 있어 인성을 향상시키려면 Cr, Mo, C, N, O 함량을 줄여야 한다. 그러나, Cr, Mo 의 함량을 줄이면 내식성이 저하되고, C, N, O 함량을 감소시키기 위해서는 공정상의 어려움이 있을 뿐만 아니라 비용이 많이 소요된다. 그리고, 용접부에서는 용접시 대기로부터 유입되는 N, O 에 의해 인성 및 내식성의 저하를 유발한다.In order to improve toughness in such ferritic stainless steels, the Cr, Mo, C, N, O content should be reduced. However, reducing the content of Cr, Mo lowers the corrosion resistance, and in order to reduce the content of C, N, O, there are not only difficulties in the process but also costly. In the welding section, the toughness and the corrosion resistance are deteriorated by N and O introduced from the atmosphere during welding.

그래서, 페라이트계 스테인레스강을 용접할 경우에는 N, O 의 유입을 막기 위하여 Ar 과 같은 불활성 기체, 즉 보호가스를 피용접재의 상부 및 하부에서 공급하면서 용접한다. 그러나, 충분한 보호가스를 공급하더라도 어느 정도의 N, O 의 유입은 불가피하다. 특히, 배면차단(back shielding)이 불가능한 용접시공의 경우, 용접금속에서의 N, O 의 함량이 크게 증가하여 인성 및 내식성이 크게 저하된다. 그러므로, 용접시의 N, O 함량의 증가를 고려하면 모재의 N, O 의 함량을 대폭적으로 낮춰야 하지만, 이런 N, O 를 정련하는 정련비용이 크게 증대되는 또 다른 문제점이 유발된다.Therefore, when welding ferritic stainless steel, inert gas such as Ar, that is, a protective gas, is welded while being supplied from the upper and lower portions of the material to be welded in order to prevent the inflow of N and O. However, even if sufficient protective gas is supplied, the inflow of N and O to some extent is inevitable. In particular, in the case of welding construction where back shielding is not possible, the content of N and O in the weld metal is greatly increased, so that toughness and corrosion resistance are greatly reduced. Therefore, considering the increase in the N, O content during welding, the content of N, O of the base material should be drastically lowered, but another problem is caused that the refining cost of refining such N, O is greatly increased.

따라서, 본 발명은 앞서 설명한 바와 같은 종래 기술의 문제점을 해결하기 위하여 안출된 것으로서, Cr, Mo 의 함량을 감소시키지 않고 별도의 Ni 을 첨가함으로써 용접부에서의 인성을 향상시킬 수 있는 페라이트계 스테인레스강을 제공하는 데 그 목적이 있다.Accordingly, the present invention has been made in order to solve the problems of the prior art as described above, by adding a separate Ni without reducing the content of Cr, Mo to ferritic stainless steel that can improve the toughness in the weld portion The purpose is to provide.

앞서 설명한 바와 같은 목적을 달성하기 위한 본 발명은, C : 0.03 중량% 이하, N : 0.04 중량% 이하, O : 0.02 중량% 이하, Si : 1.0 중량% 이하, Mn : 1.0 중량% 이하, P : 0.03 중량% 이하, S 0.004 중량% 이하, Cu : 0.5 중량% 이하, Al : 0.2 중량% 이하, Mo : 5.0 중량% 이하, Ti+Nb : 1.0 중량% 이하, Cr : 18∼30 중량%, 그 나머지가 Fe 및 불순물을 포함하고, 여기에 Ni 을 1.0 ∼ 3.0 중량% 첨가함으로써 용접부에서의 인성을 향상시킨다.The present invention for achieving the object as described above, C: 0.03% by weight or less, N: 0.04% by weight or less, O: 0.02% by weight or less, Si: 1.0% by weight or less, Mn: 1.0% by weight or less, P: 0.03 wt% or less, S 0.004 wt% or less, Cu: 0.5 wt% or less, Al: 0.2 wt% or less, Mo: 5.0 wt% or less, Ti + Nb: 1.0 wt% or less, Cr: 18-30 wt%, the The remainder contains Fe and impurities, and the toughness in a weld part is improved by adding 1.0-3.0 weight% of Ni to it.

아래에서는, 본 발명에서 규정한 성분의 함유량에 대해서 설명하겠다. 아래에서 사용되는 %는 중량%를 나타낸다.Below, content of the component prescribed | regulated by this invention is demonstrated. % Used below represents weight%.

C 및 N 은 페라이트계 스테인레스강에 있어서 입내에 고용되어 가공성을 저하시킬 뿐만 아니라, 탄화물, 질화물 등을 생성시킴으로써 인성을 저하시킨다. 이런 이유로, C 및 N 의 함량은 낮을수록 좋으므로 상한을 각각 0.03%, 0.04%로 설정한다.C and N are dissolved in the mouth in ferritic stainless steel to reduce workability, and also reduce toughness by generating carbides, nitrides and the like. For this reason, the lower the contents of C and N, the better, so the upper limits are set to 0.03% and 0.04%, respectively.

O 는 균열의 시작장소인 산화물계 게재물을 생성시켜 용접부의 인성을 저하시킨다. 이런 이유로, O 의 함량은 낮을수록 좋으므로 상한을 0.02%로 설정한다.O creates an oxide-based inclusion that is the starting point of the crack, thereby reducing the toughness of the weld. For this reason, the lower the O content is, the better, so the upper limit is set to 0.02%.

Si 는 탈산제로 유효한 원소이며, 내고온 산화성을 개선시키는 작용을 한다. 또한, 용강 중의 포화질소량을 감소시켜 주는 역할을 하여 용접부의 가공성 및 인성을 개선하는 데 유효하다. 그러나, 과다한 Si 를 첨가하면 소재의 가공성이 손상되므로 Si 의 함량의 상한을 1.0%로 설정한다.Si is an effective element as a deoxidizer and functions to improve high temperature oxidation resistance. In addition, it serves to reduce the amount of saturated nitrogen in the molten steel is effective in improving the workability and toughness of the weld. However, if excessive Si is added, the workability of the material is impaired, so the upper limit of the content of Si is set to 1.0%.

Mn 은 탈산제로 유효한 원소이며, 고용강화 효과가 있다. 그러나, 과다한 Mn 을 첨가하면 내식성 저하의 원인이 되므로 Mn 의 함량의 상한을 1.0%로 설정한다.Mn is an effective deoxidizer and has a solid solution effect. However, addition of excessive Mn causes deterioration of corrosion resistance, so the upper limit of the Mn content is set to 1.0%.

P 은 내식성 및 인성을 저하시키므로 P 의 함량의 상한을 0.03%로 설정한다.Since P reduces corrosion resistance and toughness, the upper limit of the content of P is set to 0.03%.

S 은 내식성을 저하시키므로 S 의 함량의 상한을 0.004%로 설정한다.Since S reduces corrosion resistance, the upper limit of the content of S is set to 0.004%.

Cu 는 환원성 분위기에서 내식성을 증가시키지만 0.5% 이상 첨가시 내공식성(표면에 미소구멍이 형성되는 것), 응력부식저항성 및 열간가공성을 감소시키므로 Cu 의 함량의 상한을 0.5%로 설정한다.Cu increases the corrosion resistance in a reducing atmosphere, but when 0.5% or more is added, the corrosion resistance (the formation of micropores on the surface), the stress corrosion resistance and the hot workability are reduced, so the upper limit of the Cu content is set to 0.5%.

Al 은 탈산제로 유효한 원소이며, 인성을 증가시켜주는 효과가 있다. 그러나, 과다한 Al 의 첨가는 Al 산화물이 형성되어 내식성이 감소되므로 Al 의 함량의 상한을 0.2%로 설정한다.Al is an effective deoxidizer and has the effect of increasing toughness. However, excessive addition of Al forms the upper limit of the Al content to 0.2% because Al oxide is formed and corrosion resistance is reduced.

Ti 및 Nb 은 필요에 따라 첨가되는 합금원소이며, 내식성 및 인성에 유해한 Cr 탄화물 및 질화물 생성을 억제시켜 주는 효과가 있다. 또한, 고온강도 향상에도 유효하다. 그러나, C 및 N 와의 관계에서 과다하게 첨가하면 인성의 저하를 초래한다. 따라서, Ti 및 Nb 의 함량의 합계량을 1.0%이하로 하는 것이 필요하다.Ti and Nb are alloy elements added as needed, and have an effect of suppressing the formation of Cr carbide and nitride, which are harmful to corrosion resistance and toughness. It is also effective for improving high temperature strength. However, excessive addition in the relationship with C and N causes a decrease in toughness. Therefore, it is necessary to make the total amount of content of Ti and Nb into 1.0% or less.

Mo 은 필요에 따라 첨가되는 합금원소로 내식성의 향상에 유효하다. 그러나, 과다한 Mo 을 첨가하면 소재의 가공성 및 인성을 저하시키므로 Mo 의 함량의 상한을 5.0%로 설정한다.Mo is an alloying element added as needed and is effective for improving corrosion resistance. However, adding excessive Mo lowers the workability and toughness of the material, so the upper limit of the Mo content is set at 5.0%.

Cr 은 페라이트계 스테인레스강의 주요원소로 페라이트 단상의 조직을 확보하려면 18% 이상의 Cr 이 필요하다. 그러나, 과다한 Cr 첨가는 소재의 취화를 유발하고 제조를 매우 어렵게 한다. 따라서, Cr 의 함량의 상한을 30%로 설정한다.Cr is the main element of ferritic stainless steel and requires 18% Cr or more to secure the structure of ferrite single phase. However, excessive addition of Cr causes embrittlement of the material and makes the production very difficult. Therefore, the upper limit of the content of Cr is set to 30%.

Ni 은 일반적으로 페라이트계 스테인레스강에는 첨가하지 않으나, 1.0%이상을 첨가하면 C 및 N 의 고용도를 증가시켜 인성을 향상시킨다. 그러나, 과다하게 첨가하면 용접부에서 마르텐사이트상이 생성되어 인성 및 내식성이 저하되며, 4.0%이상은 오스테나이트 또는 이상계 스테인레스상이 되므로 Ni 의 함량의 상한을 3.0%이하로 선정한다.Ni is generally not added to ferritic stainless steel, but adding 1.0% or more increases the solid solubility of C and N to improve toughness. However, when excessively added, the martensite phase is formed in the welded portion, thereby reducing the toughness and corrosion resistance. Since the 4.0% or more becomes an austenite or an ideal stainless steel phase, the upper limit of the Ni content is selected to 3.0% or less.

앞서 설명한 바와 같은 각각의 특징을 갖는 성분 및 그 함유량은 페라이트계 스테인레스강의 성분 및 그 함유량으로서, 종래의 페라이트계 스테인레스강의 성분 및 그 함유량과 동일하거나 유사하다. 그러나, 본 발명의 페라이트계 스테인레스강에는 아래와 같은 실험방법에 의해 함유량이 결정된 Ni 이 첨가되어 있다.The components having respective characteristics as described above and their contents are the components of ferritic stainless steel and their contents, which are the same as or similar to those of the conventional ferritic stainless steel and their contents. However, Ni whose content is determined by the following experimental method is added to the ferritic stainless steel of this invention.

<실시예><Example>

주성분 19% Cr 에 서로 다른 함량의 Ni 을 첨가한 4㎜ 두께의 페라이트계 스테인레스강을 실험 시편으로 사용하였다. 이 때, 용접부의 인성을 평가하기 위하여 표 1에 나타낸 조건에 따라 용접을 실시하였다.4 mm thick ferritic stainless steels containing Ni as the main component of 19% Cr were used as test specimens. At this time, welding was performed in accordance with the conditions shown in Table 1 in order to evaluate the toughness of the welded portion.

용 접 방 법welding method 용 접 조 건Welding condition 보 호 가 스Protection guard 비 고Remarks LBW(Laser Beam Welding)Laser Beam Welding (LBW) 레이저 출력 : 5 kW용접속도 : 1.1m/분Laser power: 5 kW Connection degree: 1.1 m / min He, 40ℓ/minHe, 40ℓ / min CO2LaserCO 2 Laser

이와 같은 용접방법으로 실험 시편을 용접하여 테스트한 결과가 표 2 및 표 3에 각각 나타나 있다.The test results of the test specimens welded by the welding method are shown in Table 2 and Table 3, respectively.

NONO Ni(wt%)Ni (wt%) C(ppm)C (ppm) N(ppm)N (ppm) O(ppm)O (ppm) 모재Base material 용접부Weld 모재Base material 용접부Weld 모재Base material 용접부Weld 1One 0.40.4 7575 100100 110110 290290 6060 250250 22 2.02.0 8080 9595 117117 300300 5050 220220 33 2.62.6 8282 110110 114114 280280 5050 240240 44 3.53.5 8080 110110 115115 310310 5555 250250

표 2는 모재와 용접금속에서의 C, N 및 O 의 함량을 나타낸 것으로서, 용접금속에서의 N 및 O 의 함량이 용접시 대기로부터의 유입으로 인하여 크게 증가됨을 알 수 있다. 이런 N 및 O 의 증가는 질화물 및 산화물을 생성시켜 인성을 저하시킨다.Table 2 shows the contents of C, N and O in the base metal and the weld metal, and it can be seen that the content of N and O in the weld metal is greatly increased due to inflow from the atmosphere during welding. This increase in N and O produces nitrides and oxides that lower the toughness.

NONO Ni(wt%)Ni (wt%) DBTT(℃)DBTT (℃) 모재Base material 용접부Weld 1One 0.40.4 1010 6060 22 2.02.0 00 1010 33 2.62.6 00 1010 44 3.53.5 00 2020

표 3은 Ni 의 함량변화에 따른 모재 및 용접부의 인성변화를 나타낸 것이다. 여기에서, 연성 취성 천이온도(DBTT)가 낮을수록 인성이 높음을 의미한다. 표 3에서 알 수 있듯이, 모재는 Ni 의 함량이 증가함에 따라 인성이 크게 증가하지 않았다. 그러나, 용접부의 경우 Ni 의 함량이 0.4%, 즉 통상의 페라이트계 스테인레스강의 Ni 의 함량에서는 DBTT 가 60℃를 보였지만, Ni 의 함량이 2.0%, 2.6%에서는 DBTT 가 10℃로 인성이 크게 향상되었다. 그러나, Ni 의 함량이 3.5%에서는 입계에서의 마르텐사이트상의 생성으로 DBTT 가 20℃로 증가하였다.Table 3 shows the change in the toughness of the base metal and the welded part according to the change of the Ni content. Here, the lower the soft brittle transition temperature (DBTT) means that the toughness is higher. As can be seen from Table 3, the base material did not significantly increase the toughness with increasing Ni content. However, in the welded part, the Ni content was 0.4%, that is, DBTT was 60 ° C in the Ni content of the conventional ferritic stainless steel, but the DBTT was 10 ° C in the Ni content of 2.0% and 2.6%. . However, at the Ni content of 3.5%, the DBTT increased to 20 ° C due to the formation of martensite phase at the grain boundary.

앞서 설명한 바와 같은 실험결과를 기초로 할 때, 1.0 ∼ 3.0%의 Ni 이 첨가된 페라이트계 스테인레스강이 용접부에서 인성이 우수하다는 것을 알 수 있었다.Based on the experimental results as described above, it can be seen that the ferritic stainless steel added with 1.0 to 3.0% of Ni has excellent toughness in the welded portion.

앞서 상세히 설명한 바와 같이 본 발명의 용접부에서의 인성이 우수한 페라이트계 스테인레스강은 Cr 및 Mo 의 감소 없이 1.0 ∼ 3.0%의 Ni 을 첨가함으로써 용접부에서의 인성을 향상시킬 수 있다.As described in detail above, the ferritic stainless steel having excellent toughness in the weld portion of the present invention can improve the toughness in the weld portion by adding 1.0 to 3.0% of Ni without reducing Cr and Mo.

또한, 본 발명의 페라이트계 스테인레스강은 용접부의 인성이 우수함으로 기존에는 사용되지 못했던 여러 분야에 광범위하게 응용될 수 있다.In addition, the ferritic stainless steel of the present invention can be widely applied to various fields that have not been used because of the excellent toughness of the weld.

이상에서 본 발명의 용접부에서의 인성이 우수한 페라이트계 스테인레스강에 대한 기술사상을 첨부도면과 함께 서술하였지만 이는 본 발명의 가장 양호한 실시예를 예시적으로 설명한 것이지 본 발명을 한정하는 것은 아니다.The technical idea of the ferritic stainless steel having excellent toughness in the welded part of the present invention has been described above with the accompanying drawings, but this is only illustrative of the best embodiment of the present invention and is not intended to limit the present invention.

Claims (1)

페라이트계 스테인레스강에 있어서,In ferritic stainless steel, C : 0.03 중량% 이하, N : 0.04 중량% 이하, O : 0.02 중량% 이하, Si : 1.0 중량% 이하, Mn : 1.0 중량% 이하, P : 0.03 중량% 이하, S 0.004 중량% 이하, Cu : 0.5 중량% 이하, Al : 0.2 중량% 이하, Mo : 5.0 중량% 이하, Ti+Nb : 1.0 중량% 이하, Cr : 18∼30 중량%, 그 나머지가 Fe 및 불순물을 포함하고, 여기에 Ni 을 1.0 ∼ 3.0 중량% 첨가함으로써 용접부에서의 인성이 향상되는 것을 특징으로 하는 용접부에서의 인성이 우수한 페라이트계 스테인레스강.C: 0.03 wt% or less, N: 0.04 wt% or less, O: 0.02 wt% or less, Si: 1.0 wt% or less, Mn: 1.0 wt% or less, P: 0.03 wt% or less, S 0.004 wt% or less, Cu: 0.5% by weight or less, Al: 0.2% by weight or less, Mo: 5.0% by weight or less, Ti + Nb: 1.0% by weight or less, Cr: 18-30% by weight, the remainder includes Fe and impurities, and Ni is added thereto. A ferritic stainless steel having excellent toughness in a welded portion, wherein the toughness in the welded portion is improved by adding 1.0 to 3.0% by weight.
KR1019980051724A 1998-11-30 1998-11-30 Ferrite type stainless steel excellent in toughness in welding unit KR20000034395A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101309921B1 (en) * 2011-08-01 2013-09-17 주식회사 포스코 Welded Steel Pipe Having Excellent Spinning Formability And Method of Manufacturing The Same

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Publication number Priority date Publication date Assignee Title
JPS5487629A (en) * 1977-12-23 1979-07-12 Nippon Steel Corp Method of producing ferrite stainless steel for welded construction
JPS56158850A (en) * 1980-05-13 1981-12-07 Nippon Yakin Kogyo Co Ltd Ferrite stainless steel with superior corrosion resistance, formability and weldability
KR920702434A (en) * 1990-03-24 1992-09-04 가히 미끼 Ferritic series heat resistant stainless steel with excellent low temperature toughness, weldability and heat resistance

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5487629A (en) * 1977-12-23 1979-07-12 Nippon Steel Corp Method of producing ferrite stainless steel for welded construction
JPS56158850A (en) * 1980-05-13 1981-12-07 Nippon Yakin Kogyo Co Ltd Ferrite stainless steel with superior corrosion resistance, formability and weldability
KR920702434A (en) * 1990-03-24 1992-09-04 가히 미끼 Ferritic series heat resistant stainless steel with excellent low temperature toughness, weldability and heat resistance

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101309921B1 (en) * 2011-08-01 2013-09-17 주식회사 포스코 Welded Steel Pipe Having Excellent Spinning Formability And Method of Manufacturing The Same

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