KR900000280B1 - High tensile structural steel with favourable weldability - Google Patents
High tensile structural steel with favourable weldability Download PDFInfo
- Publication number
- KR900000280B1 KR900000280B1 KR1019840007613A KR840007613A KR900000280B1 KR 900000280 B1 KR900000280 B1 KR 900000280B1 KR 1019840007613 A KR1019840007613 A KR 1019840007613A KR 840007613 A KR840007613 A KR 840007613A KR 900000280 B1 KR900000280 B1 KR 900000280B1
- Authority
- KR
- South Korea
- Prior art keywords
- steel
- high tensile
- weldability
- structural steel
- favourable
- Prior art date
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
- 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
- C22C38/18—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
- C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Steel (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
Description
본 발명은 다음 합금성분으로된 양호한 용접성을 갖는 고인장 구조용 강재(鋼材)에 관한 것이다.The present invention relates to a high tensile structural steel having good weldability of the following alloy components.
질소고정을 위한 알루미늄 그리고 또는 티타늄.Aluminum and / or titanium for nitrogen fixation.
일반적으로 양호한 용접성을 갖는 이러한 고인장 구조용 강재는 물을 이용한 팍칭과 템퍼링으로 양호한 특성을 소유하게 된다. 예를 들어, 아메리칸 스틸 T1 및 N-A-XTRA를 인용할 수 있다.In general, these high tensile structural steels with good weldability possess good properties due to watering and tempering. For example, American Steel T1 and N-A-XTRA can be cited.
그러나 실제로는 물을 이용한 팍칭과 템퍼링이 항상 실행가능한 것은 아니며, 오일을 이용한 켄칭과 템퍼링이 주로 이용되고 있는 실정이다. 아울러 오일팍칭 및 템퍼링된 강은 예를 들어, 내부응력의 감소와 화염절단 및 용접중 변형의 감소등과 같이 물을 이용하여 퀀칭 및 템퍼링된 것보다 여러 가지면에서 유리한 특성을 갖는다.In practice, however, watering and tempering are not always feasible, and quenching and tempering with oil are mainly used. In addition, oil-packed and tempered steels have many advantages over those quenched and tempered with water, such as, for example, reduced internal stresses, flame cutting and reduced strain during welding.
본 발명의 목적은 오일팍칭과 템퍼링에 적합하고 높은 인장강도를 갖는 양호한 용접성을 지니는 강을 제공하는데 있다.It is an object of the present invention to provide a steel having good weldability with high tensile strength and suitable for oil patching and tempering.
처음 언급된 형태의 고인장 구조용 강재를 기초로 하여 이러한 문제점은 니오븀의 함량이 약 0.005-0.03중량%, 특히 0.008-0.02중량%인 본 발명의 강에 의하여 해결될 수 있다.On the basis of the high tensile structural steel of the type mentioned first, this problem can be solved by the steel of the present invention having a niobium content of about 0.005-0.03% by weight, in particular 0.008-0.02% by weight.
본 발명의 강은 화학적인 조성이 오일팍칭 및 템퍼링에 적합하다. 따라서, 본 발명에 따른 강은 물을 이용한 팍칭 및 템퍼링이 불가능하거나 바람직하지 못한 경우에 처리될 수 있다. 본 발명에 따른 강을 이용하는 경우 물을 이용한 팍칭 및 템퍼링된 강과 인장강도와 용접성이 동일하다.The steel of the present invention is chemically suitable for oil patching and tempering. Thus, the steel according to the invention can be treated if it is impossible or undesirable to pack and temper with water. In the case of using the steel according to the present invention, the tensile strength and weldability are the same as those of water-packed and tempered steel.
다른 방법으로서 티타늄은 약 0.02-0.08중량%, 특히 0.030-0.060중량%의 함량이 증가된 알루미늄으로 대체할 수 있다. 알루미늄, 니오븀 및 붕소의 조합은 특히 중요하다. 붕소가 합금된 열처리 가능한 구조용 강재는 알려진지 오래 되었으나 이들은 붕소질화물(붕소 침탄질화물)의 형성을 방지하도록 질소고정에 필요한 티타늄이 합금된다. 그러나, 상당량의 탄소가 티타늄과 결합되어 티타늄이 순수질화물을 형성하지 못하며 탄소함량이 높은 침탄질화물을 형성하게 된다. 티타늄 침탄질화물 조직은 강의 품질을 향상시키지 못하는 2차 조직에서 부분적으로 눈에 보이는 매우 조약한 결정 또는 결정질이다. 티타늄 대신에 알루미늄을 사용하는 경우 질화물만이 형성되어 우선 석출형태로 특정 조건하에서는 가지의 강도강화에 기여한다. 질소 그리고/또는 탄소와 결합되지 않는 경우 합금원소 붕소는 변태를 지연시켜 경화 및 탬퍼링 감도를 향상시킨다. 또한 이에 따라서 마르덴사이트 단계에서 변태가 일어날 수 있다. 즉, 낮은 냉각속도에서도 오일 경화중에 변태된다.As an alternative, titanium can be replaced with aluminum having an increased content of about 0.02-0.08% by weight, in particular 0.030-0.060% by weight. The combination of aluminum, niobium and boron is particularly important. Boron alloyed heat treatable structural steels have long been known, but they are alloyed with titanium, which is required for nitrogen fixation to prevent the formation of boron nitride (boron carburized nitride). However, a significant amount of carbon is combined with titanium to prevent titanium from forming pure nitride and to form carburized nitride having a high carbon content. Titanium carbonitride tissue is a very coarse crystal or crystalline that is partially visible in secondary tissues that do not improve the quality of the steel. When aluminum is used instead of titanium, only nitride is formed, which first forms a precipitate, which contributes to the strengthening of branches under certain conditions. Boron alloying elements, when not combined with nitrogen and / or carbon, delay transformation and improve hardening and tampering sensitivity. Also, accordingly, transformation may occur at the mardensite stage. In other words, the transformation occurs during oil curing even at a low cooling rate.
본 발명에 따른 구조용 강재의 경우 그 인성은 낮은 템퍼링단계에서도 현저하므로 템퍼링온도는 광범위한 범위내에서 변화가능하다 이렇게 하여 항복강도는 화학적인 조성의 변화없이 500N/mm2-100N/mm2의 범위까지 변화될 수 있으며 요구조건을 충족시킬 수 있다. 여기에서 온도는 약 200。-600℃이다. 이러한 잇점은 특히 소량의 고인장강을 특성이 상이하게 생산하여야 하는 경우 유리한다. 따라서 상이한 판두께에 따른 냉각조건을 보상하는 것이 가능하고 기계적인 특성에 대하여 구조적인 차이를 보상하는 것이 가능하다.In the case of structural steel according to the invention that the toughness is low it is remarkable, so the tempering temperature can be varied within a wide range in the tempering step to thus yield strength chemical shift range of 500N / mm 2 -100N / mm 2 without the composition Can be changed and meet the requirements. The temperature here is about 200 ° -600 ° C. This advantage is particularly advantageous when small quantities of high tensile steel must be produced with different properties. It is therefore possible to compensate for cooling conditions according to different plate thicknesses and to compensate for structural differences in terms of mechanical properties.
본 발명의 구조용 강재에 있어서는 니오븀함량이 낮은 것이 특히 중요하다. 상기 원소의 효과는 함량이 0.005 중량% 정도에서도 얻어짐이 조사에 의하여 입증되었다. 상기 한계치 이상에서는 석출경화효과가 적어 별로 잇점이 없다. 본 발명에 따른 강에 있어서 이러한 효과는 실제로 모든 열처리 가능한 강의 경우와 마찬가지로 용접중의 강도손실, 소위 열영향부에서의 경도저하가 이루어짐을 감안할때에 낮은 단련온도에서 특히 유익하다. 기지에서의 석출경화는 이러한 강도손실을 방지한다. 또한 이는 원소 바나듐의 경우와 같이, 니오븀침탄질화물은 매우 안정하므로 가능한 응력제거 열처리와 이에 따른 취화효과의 경우에 있어서 새로운 석출에 수반되어 열영향부에서 침탄질화물의 용해가 일어나지 않는 것은 니오븀함량이 낮기 때문이라고 생각된다.In the structural steel of the present invention, it is particularly important that the niobium content is low. The effect of the element was proved by the investigation that the content was obtained even at about 0.005% by weight. Above the threshold, the precipitation hardening effect is small, so there is no advantage. In the steel according to the invention this effect is particularly advantageous at low annealing temperatures, in view of the fact that the strength loss during welding, the so-called hardness reduction in the heat affected zone, as in the case of virtually all heat treatable steels, is achieved. Precipitation hardening at the site prevents this strength loss. In addition, as in the case of elemental vanadium, niobium sedimentation carbonitride is very stable, so in the case of possible stress relief heat treatment and consequent embrittlement effect, the niobium content is low that the dissolution of carburization nitride does not occur in the heat affected zone due to new precipitation. I think it is.
이와 같이 본 발명의 강은 예를 들어, 경량구조물(가동 구조물), 선박용 마스트 및 지지프레임의 생산에 있어서 극고응력이 예상되는 것에 이용가능하다.Thus, the steel of the present invention can be used, for example, in which extremely high stress is expected in the production of lightweight structures (movable structures), marine masts and support frames.
본 발명에 따른 고인성 구조용 강재는 낮은 온도에서도 그 인성이 크므로 본 형태의 강은 잠수정과 같이 높은 응력이 필요한 비교적 낮은 온도에서 유익하게 사용될 수 있다.Since the high toughness structural steel according to the present invention has high toughness even at low temperatures, this type of steel can be advantageously used at relatively low temperatures requiring high stresses, such as submersibles.
Claims (1)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU22585/83A AU573553B2 (en) | 1983-12-20 | 1983-12-20 | High tensile structural steel with favourable weldability |
AU22585 | 1983-12-20 |
Publications (2)
Publication Number | Publication Date |
---|---|
KR850004999A KR850004999A (en) | 1985-08-19 |
KR900000280B1 true KR900000280B1 (en) | 1990-01-24 |
Family
ID=3711774
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
KR1019840007613A KR900000280B1 (en) | 1983-12-20 | 1984-12-03 | High tensile structural steel with favourable weldability |
Country Status (9)
Country | Link |
---|---|
KR (1) | KR900000280B1 (en) |
AU (1) | AU573553B2 (en) |
BR (1) | BR8406524A (en) |
CA (1) | CA1271650A (en) |
EG (1) | EG17092A (en) |
IL (1) | IL73465A (en) |
MX (1) | MX162376A (en) |
NZ (1) | NZ210174A (en) |
ZA (1) | ZA849877B (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
BR8404270A (en) * | 1984-08-27 | 1986-04-01 | Marchesan Implement & Maquin | STEEL COMPOSITION FOR AGRICOLE DISCS |
-
1983
- 1983-12-20 AU AU22585/83A patent/AU573553B2/en not_active Ceased
-
1984
- 1984-10-31 MX MX203233A patent/MX162376A/en unknown
- 1984-11-09 IL IL73465A patent/IL73465A/en unknown
- 1984-11-09 NZ NZ210174A patent/NZ210174A/en unknown
- 1984-11-12 EG EG698/84A patent/EG17092A/en active
- 1984-11-26 CA CA000468597A patent/CA1271650A/en not_active Expired - Fee Related
- 1984-12-03 KR KR1019840007613A patent/KR900000280B1/en not_active IP Right Cessation
- 1984-12-18 BR BR8406524A patent/BR8406524A/en unknown
- 1984-12-19 ZA ZA849877A patent/ZA849877B/en unknown
Also Published As
Publication number | Publication date |
---|---|
EG17092A (en) | 1991-08-30 |
NZ210174A (en) | 1988-04-29 |
KR850004999A (en) | 1985-08-19 |
BR8406524A (en) | 1985-10-15 |
ZA849877B (en) | 1985-06-17 |
MX162376A (en) | 1991-05-02 |
AU2258583A (en) | 1985-06-27 |
CA1271650A (en) | 1990-07-17 |
IL73465A (en) | 1987-10-20 |
IL73465A0 (en) | 1985-02-28 |
AU573553B2 (en) | 1988-06-16 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US5288347A (en) | Method of manufacturing high strength and high toughness stainless steel | |
US3251682A (en) | Low-alloy tough steel | |
US2858206A (en) | Nickel-free, low-alloy, high-strength steel | |
US3348981A (en) | High tension low temperature tough steel | |
ES2971876T3 (en) | Procedure for manufacturing a thick steel plate with excellent low temperature strain aging impact properties | |
JPH10152746A (en) | Boron steel gear excellent in fatigue resistance and its production | |
CN112048668B (en) | High-hardness steel for shield cutter and manufacturing method thereof | |
US2516125A (en) | Alloy steel | |
KR900000280B1 (en) | High tensile structural steel with favourable weldability | |
US3463677A (en) | Weldable high strength steel | |
US3834897A (en) | Low-carbon,high-strength structural steel with good weldability | |
EP3730655A1 (en) | High strength steel sheet and manufacturing method therefor | |
JP2768062B2 (en) | Manufacturing method of high strength tough steel | |
KR920010228B1 (en) | Making process for mooring chain steel having a good weldabilty | |
KR900000279B1 (en) | Process for production of high-hardness hardened and tempered special steel and special steel alloy | |
JPS58224116A (en) | Production of seamless steel pipe having excellent resistance to sulfide stress corrosion cracking | |
US4060431A (en) | Heat-treatable steel | |
JP3228008B2 (en) | High-strength martensitic stainless steel excellent in stress corrosion cracking resistance and method for producing the same | |
JPH0978184A (en) | Case hardening steel excellent ion cold workability and crystalline grain coarsening characteristic | |
US4216014A (en) | Low temperature steel alloy | |
KR102359299B1 (en) | Ultra-high strength, high co-ni secondary hardening martensitic steel and its manufacturing method | |
KR102498150B1 (en) | Armored steel havinh high hardness and excellent low-temperature impact toughness and method for manufacturing thereof | |
KR102498142B1 (en) | Armored steel havinh high hardness and excellent low-temperature impact toughness and method for manufacturing thereof | |
US20050169790A1 (en) | Steel for components of chemical installations | |
KR102498147B1 (en) | Armored steel havinh high hardness and excellent low-temperature impact toughness and method for manufacturing thereof |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
A201 | Request for examination | ||
E902 | Notification of reason for refusal | ||
E902 | Notification of reason for refusal | ||
G160 | Decision to publish patent application | ||
E701 | Decision to grant or registration of patent right | ||
GRNT | Written decision to grant | ||
FPAY | Annual fee payment |
Payment date: 19930224 Year of fee payment: 4 |
|
LAPS | Lapse due to unpaid annual fee |