JP5005178B2 - Cast steel beam-to-column joint hardware with excellent weldability and impact resistance - Google Patents
Cast steel beam-to-column joint hardware with excellent weldability and impact resistance Download PDFInfo
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本発明は鉄骨建築物の鉄骨柱と鉄骨梁の接合部に使用される仕口用の鋳鋼製柱梁接合金物に係り、溶接割れの発生を防止し、機械的強度を大きく確保しつつ、外力に対する耐衝撃性に優れた鋳鋼製柱梁接合金物に関するものである。 The present invention relates to a cast steel column beam joint for a joint used for a joint between a steel column and a steel beam in a steel building, and prevents the occurrence of weld cracks, while ensuring a large mechanical strength, and an external force. The present invention relates to a cast-steel beam-to-column metal fitting having excellent impact resistance against the above.
従来、鉄骨建築物の構造部材としては、一般的にＨ型鋼等の形鋼や平板等の圧延鋼材からなる鋼材が広く用いられている。
鉄骨建築物の柱と梁の仕口部は、前述の圧延材からなる鋼材を加工して製作することが一般的であり、手間と技量を必要とされると共に、コスト高になる問題があった。
従って、柱と梁との仕口部が複雑な形状となる場合には、比較的安価に大量生産することが出来る鋳鋼製が使用されることもあった。
しかしながら、建築物の構造部材に使用される鋳鋼には、建築構造用として適した機械的性質を加味した鋳鋼の規格が定められておらず、ＪＩＳ規格に溶接構造用鋳鋼としてＳＣＷ材が規格化されているのみである。
この溶接構造用鋳鋼で柱梁接合金物に使われるＳＣＷ材の例としてＳＣＷ４８０の機械的性質および化学成分の規格値を表１に示す。
Conventionally, as a structural member of a steel building, a steel material made of a rolled steel material such as a shape steel such as an H-shaped steel or a flat plate has been widely used.
Steel and steel building columns and beam joints are generally manufactured by processing the steel materials made of the above-mentioned rolled materials, which requires labor and skill and increases costs. It was.
Therefore, when the joint portion between the column and the beam has a complicated shape, cast steel that can be mass-produced at a relatively low cost may be used.
However, for cast steel used for structural members of buildings, there is no standard for cast steel that takes into account mechanical properties suitable for use in building structures. SCW materials are standardized as cast steel for welded structures in JIS standards. It has only been done.
Table 1 shows the standard values of the mechanical properties and chemical components of SCW480 as an example of the SCW material used for the beam-to-column joint metal in this welded structural cast steel.
炭素（Ｃ）：強度を高めるのに非常に有効だが、延性や衝撃特性を低下させる。また、強度確保を炭素（Ｃ）に頼ると溶接性が損なわれる。
ケイ素（Ｓｉ）：強度を高めるのに有効だが、延性や衝撃特性を低下させる。添加による効果は少ないが、多量に添加すると溶接性を低下させる。
マンガン（Ｍｎ）：強度確保と延性や衝撃特性改善に有効な元素だが、多量に添加すると延性や衝撃特性を低下させる。
リン（Ｐ）：不純物元素で、含有量は低い方がいいが脱リンにコストがかかる。溶接性・冷間加工性、衝撃特性を劣化させる。
硫黄（Ｓ）：リンとともに不純物元素であり、鋼中に硫黄系介在物を形成し、鋼材の異方性、特に板厚方向特性に影響を及ぼす。
ニッケル（Ｎｉ）：低温における衝撃特性を増加させる。また耐食性を向上させる働きがあるが高価である。
クロム（Ｃｒ）：耐摩擦性、耐食性を増加させる。また、焼入れ性を改善し、強度を高めるが、溶接熱影響部を硬化させ、溶接低温割れを起しやすくする。
Carbon (C): Very effective in increasing strength, but reduces ductility and impact properties. Further, if the strength is relied on carbon (C), the weldability is impaired.
Silicon (Si): Effective for increasing strength, but reduces ductility and impact properties. The effect of addition is small, but if it is added in a large amount, the weldability is lowered.
Manganese (Mn): An element effective for securing strength and improving ductility and impact properties. However, if added in a large amount, it decreases ductility and impact properties.
Phosphorus (P): Impurity element. Low content is better, but cost is high for dephosphorization. Degradation of weldability, cold workability and impact properties.
Sulfur (S): An impurity element together with phosphorus, forms sulfur-based inclusions in the steel, and affects the anisotropy of the steel material, particularly the thickness direction characteristics.
Nickel (Ni): Increases impact properties at low temperatures. Moreover, although it has a function which improves corrosion resistance, it is expensive.
Chromium (Cr): Increases friction resistance and corrosion resistance. Moreover, although hardenability is improved and intensity | strength is improved, a welding heat affected zone is hardened and it makes it easy to raise | generate a cold crack in welding.
また、溶接性を評価する指標として炭素当量（Ｃｅｑ）が使われることが多いが、ＳＣＷ４８０では炭素当量０．４５以下と規定されている。
炭素当量（Ｃｅｑ）は含まれる化学成分の重量比を用いてＣｅｑ＝Ｃ＋Ｍｎ／６＋Ｓｉ／２４＋Ｎｉ／４０+Ｃｒ／５＋Ｍｏ／４＋Ｖ／１４で求めれられるが、この指標は、炭素量が０．２０％を超えるような高炭素で、合金元素の重量比の合計が８％以下の低合金鋼に適しているとされる。
In addition, although carbon equivalent (Ceq) is often used as an index for evaluating weldability, SCW480 specifies that carbon equivalent is 0.45 or less.
The carbon equivalent (Ceq) is calculated by the weight ratio of the chemical components contained, and Ceq = C + Mn / 6 + Si / 24 + Ni / 40 + Cr / 5 + Mo / 4 + V / 14, but this index indicates that the carbon content is 0.20%. It is said that it is suitable for a low alloy steel having a high carbon content exceeding 8% and a total alloy element weight ratio of 8% or less.
なお、強度確保を炭素（Ｃ）に頼った高炭素の場合、延性や衝撃特性が低下し、溶接性も低下するため、最近では低炭素で低合金鋼の溶接性を評価する指標として、溶接割れ感受性組成（ＰＣＭ）が提案されている。溶接割れ感受性組成（ＰＣＭ）は、炭素（Ｃ）を始め、銅（Ｃｕ）、ニッケル（Ｎｉ）、クロム（Ｃｒ）、モリブデン（Ｍｏ）、バナジウム（Ｖ）、ボロン（Ｂ）などの合金成分の溶接性に与える影響を考慮して、ＰＣＭ＝Ｃ＋Ｓｉ／３０＋Ｍｎ／２０＋Ｃｕ／２０＋Ｎｉ／６０＋Ｃｒ／２０＋Ｍｏ／１５＋Ｖ／１０＋５Ｂで表される。低炭素鋼が望ましいとされるような建築構造用としてはＰＣＭ：０．２９以下が望ましいとされている。
一方、本出願人は、先に特開２００１−３３６２１５号で下記表２に示すような化学成分を有する建築構造用鋳鋼を提案し、これによれば降伏点、引張強さ、降伏比、伸び、耐衝撃性に優れ、溶接不良の発生を抑えられることを報告している。
In addition, in the case of high carbon that relies on carbon (C) for securing strength, ductility and impact properties are reduced, and weldability is also lowered. Recently, as an index for evaluating the weldability of low-alloy steel with low carbon, welding Crack sensitive compositions (PCM) have been proposed. Weld cracking susceptibility composition (PCM) is an alloy component such as carbon (C), copper (Cu), nickel (Ni), chromium (Cr), molybdenum (Mo), vanadium (V), and boron (B). In consideration of the effect on weldability, PCM = C + Si / 30 + Mn / 20 + Cu / 20 + Ni / 60 + Cr / 20 + Mo / 15 + V / 10 + 5B. It is said that PCM: 0.29 or less is desirable for building structures where low carbon steel is desirable.
On the other hand, the present applicant previously proposed a cast steel for building structure having chemical components as shown in Table 2 below in JP-A-2001-336215, and according to this, yield point, tensile strength, yield ratio, elongation It has been reported that it has excellent impact resistance and can suppress the occurrence of poor welding.
しかしながら、特開２００１−３３６２１５号提案の該建築構造用鋳鋼によっても、必ずしも満足されるような溶接性と機械的強度を大きく確保しつつ、外力に対する耐衝撃性に優れた鋳鋼製柱梁接合金物は得られなかった。
本発明は溶接性と機械的強度を大きく確保しつつ、外力に対する耐衝撃性に優れた鋳鋼製柱梁接合金物を提案することを課題とする。
However, even with the cast steel for building structure proposed in Japanese Patent Laid-Open No. 2001-336215, a cast steel beam-to-column joint hardware excellent in impact resistance against external force while ensuring large weldability and mechanical strength that are always satisfied. Was not obtained.
An object of the present invention is to propose a cast steel beam-to-column joint hardware excellent in impact resistance against external force while ensuring large weldability and mechanical strength.
本出願人はさらに検討を行い、該鋳鋼に含まれる化学成分の内、重量比で炭素（Ｃ）を０．１８％以下、ケイ素（Ｓｉ）を０．５５％以下、マンガン（Ｍｎ）を１．６０％以下、リン（Ｐ）を０．０２０％以下、硫黄（Ｓ）を０．００８％以下とし、溶接割れ感受性組成（ＰＣＭ）が０．２９以下を満足するものに於いて、銅（Ｃｕ）、ニッケル（Ｎｉ）、クロム（Ｃｒ）、モリブデン（Ｍｏ）、バナジウム（Ｖ）、ボロン（Ｂ）の重量比で表されるＰＣＭＥ＝Ｃｕ／２０＋Ｎｉ／６０＋Ｃｒ／２０＋Ｍｏ／１５＋Ｖ／１０＋５Ｂが０．０２８以下を満足すれば溶接性等を確保しつつ、耐衝撃性を大きく改善できることを見出し本発明を完成した。
さらに、該鋳鋼に含まれる化学成分の内、重量比で銅（Ｃｕ）を０．２０％以下、ニッケル（Ｎｉ）を０．１０％以下、クロム（Ｃｒ）を０．２５％以下、モリブデン（Ｍｏ）を０．１０％以下、バナジウム（Ｖ）を０．０１％以下、ボロン（Ｂ）を０．０００３％以下とすれば、安定して耐衝撃性の向上を図れることを発明した。即ち、
本発明は以下の通りである。
The applicant has further studied, and among the chemical components contained in the cast steel, carbon (C) is 0.18% or less, silicon (Si) is 0.55% or less, and manganese (Mn) is 1 by weight. .60% or less, phosphorus (P) is 0.020% or less, sulfur (S) is 0.008% or less, and the weld crack susceptibility composition (PCM) is 0.29 or less. PCME = Cu / 20 + Ni / 60 + Cr / 20 + Mo / 15 + V / 10 + 5B represented by a weight ratio of Cu), nickel (Ni), chromium (Cr), molybdenum (Mo), vanadium (V), and boron (B) is 0.00. The present invention has been completed by finding that impact resistance can be greatly improved while securing weldability and the like if 028 or less is satisfied.
Further, among the chemical components contained in the cast steel, copper (Cu) is 0.20% or less, nickel (Ni) is 0.10% or less, chromium (Cr) is 0.25% or less, and molybdenum ( It was invented that if the Mo) is 0.10% or less, the vanadium (V) is 0.01% or less and the boron (B) is 0.0003% or less, the impact resistance can be stably improved. That is,
The present invention is as follows.
（１）鉄骨柱と鉄骨梁を接合する鋳鋼製柱梁接合金物において、該鋳鋼製柱梁接合金物を構成し、炭素（Ｃ）、ケイ素（Ｓｉ）、マンガン（Ｍｎ）、リン（Ｐ）、硫黄（Ｓ）、銅（Ｃｕ）、ニッケル（Ｎｉ）、クロム（Ｃｒ）、モリブデン（Ｍｏ）、バナジウム（Ｖ）、ボロン（Ｂ）、残部Ｆｅ及び不可避的不純物よりなる鋳鋼が、その含まれる化学成分の内、重量比で炭素（Ｃ）を０．１８％以下、ケイ素（Ｓｉ）を０．５５％以下、マンガン（Ｍｎ）を１．６０％以下、リン（Ｐ）を０．０２０％以下、硫黄（Ｓ）を０．００８％以下とし、且つ溶接割れ感受性組成（ＰＣＭ＝Ｃ＋Ｓｉ／３０＋Ｍｎ／２０＋Ｃｕ／２０＋Ｎｉ／６０＋Ｃｒ／２０＋Ｍｏ／１５＋Ｖ／１０＋５Ｂ）が０．２９以下を満足すると共に、銅（Ｃｕ）、ニッケル（Ｎｉ）、クロム（Ｃｒ）、モリブデン（Ｍｏ）、バナジウム（Ｖ）、ボロン（Ｂ）の重量比で表されるＰＣＭＥ＝Ｃｕ／２０＋Ｎｉ／６０＋Ｃｒ／２０＋Ｍｏ／１５＋Ｖ／１０＋５ＢがＰＣＭＥ≦０．０２８を満たすことを特徴とする鋳鋼製柱梁接合金物。
（２）鋳鋼製柱梁接合金物を構成する鋳鋼に含まれる化学成分の内、重量比で銅（Ｃｕ）を０．２０％以下、ニッケル（Ｎｉ）を０．１０％以下、クロム（Ｃｒ）を０．２５％以下、モリブデン（Ｍｏ）を０．１０％以下、バナジウム（Ｖ）を０．０１％以下、ボロン（Ｂ）を０．０００３％以下としたことを特徴とする（１）記載の鋳鋼製柱梁接合金物。
(1) In the cast steel beam-to-column joint hardware that joins the steel column and the steel beam, the cast steel beam-to-beam joint metal is constituted of carbon (C), silicon (Si), manganese (Mn), phosphorus (P), Chemicals containing cast steel composed of sulfur (S), copper (Cu), nickel (Ni), chromium (Cr), molybdenum (Mo), vanadium (V), boron (B), balance Fe and inevitable impurities Of the components, carbon (C) is 0.18% or less, silicon (Si) is 0.55% or less, manganese (Mn) is 1.60% or less, and phosphorus (P) is 0.020% or less by weight. , with sulfur (S) and 0.008% or less, and weld cracking susceptibility composition (PCM = C + Si / 30 + Mn / 20 + Cu / 20 + Ni / 60 + Cr / 20 + Mo / 15 + V / 10 + 5B) satisfies 0.29 or less, copper (Cu ), Nicke PCME = Cu / 20 + Ni / 60 + Cr / 20 + Mo / 15 + V / 10 + 5B represented by the weight ratio of (Ni), chromium (Cr), molybdenum (Mo), vanadium (V), and boron (B) satisfies PCME ≦ 0.028. it shall be the said to satisfy cast steel beam bonding hardware.
(2) Of the chemical components contained in the cast steel constituting the cast steel column beam joint metal, the weight ratio of copper (Cu) is 0.20% or less, nickel (Ni) is 0.10% or less, and chromium (Cr). 0.25% or less, molybdenum (Mo) is 0.10% or less, vanadium (V) is 0.01% or less, and boron (B) is 0.0003% or less. (1) Cast steel column beam joint hardware.
本発明によって、溶接性と機械的強度を大きく確保しつつ、外力に対する耐衝撃性に優れた鋳鋼製柱梁接合金物を提供することができる。 According to the present invention, it is possible to provide a cast steel beam-to-column joint hardware excellent in impact resistance against external force while ensuring large weldability and mechanical strength.
本発明に係る鋳鋼製柱梁接合金物は図１に示すような鉄骨建築物の鉄骨柱１と鉄骨梁２の接合部に使用される仕口用の柱梁接合金物３で、一般に角形断面の角型柱状体からなる。
本発明の鋳鋼製柱梁接合金物は上記の通りであるが、建築構造用としては低炭素鋼が望ましいとされることから炭素量を０．１８％以下とし、衝撃特性を低下させるＳｉを０．５５％以下とし、強度確保と延性や衝撃特性からＭｎの量は１．６０以下とする。溶接性を考慮し、溶接割れ感受性組成（ＰＣＭ）＝Ｃ＋Ｓｉ／３０＋Ｍｎ／２０＋Ｃｕ／２０＋Ｎｉ／６０＋Ｃｒ／２０＋Ｍｏ／１５＋Ｖ／１０＋５Ｂは０．２９以下となるようにする。
また、不純物元素であり溶接性、衝撃特性を劣化させるリン（Ｐ）と、鋼材の異方性、方向特性に影響を及ぼす硫黄（Ｓ）は、除去にコストがかかるため、建築構造用としてその影響を最小限にとどめることが出来るとされるそれぞれ０．０２０％以下、０．００８％以下とする。
A cast steel beam-column joint according to the present invention is a joint beam-beam joint 3 for a joint used for a joint between a steel column 1 and a
Although the cast steel beam-column joint hardware of the present invention is as described above, low carbon steel is desirable for building structures. Therefore, the carbon content is set to 0.18% or less, and Si, which reduces impact characteristics, is reduced to 0. The amount of Mn is 1.60 or less from the viewpoint of securing strength, ductility and impact properties. Considering weldability, weld cracking susceptibility composition (PCM) = C + Si / 30 + Mn / 20 + Cu / 20 + Ni / 60 + Cr / 20 + Mo / 15 + V / 10 + 5B is set to 0.29 or less.
Moreover, phosphorus (P), which is an impurity element and deteriorates weldability and impact characteristics, and sulfur (S), which affects the anisotropy and direction characteristics of steel materials, are expensive to remove. 0.020% or less and 0.008% or less, respectively, which are said to be able to minimize the influence.
さらに、本出願人の検討によれば、溶接割れ感受性組成（ＰＣＭ）が０．２９以下を満足する中で、強度向上に効果のある炭素とマンガンに着目し、銅（Ｃｕ）、ニッケル（Ｎｉ）、クロム（Ｃｒ）、モリブデン（Ｍｏ）、バナジウム（Ｖ）、ボロン（Ｂ）の重量比で表される指標ＰＣＭＥ＝Ｃｕ／２０＋Ｎｉ／６０＋Ｃｒ／２０＋Ｍｏ／１５＋Ｖ／１０＋５Ｂを見出し、種々検討した結果、強度向上に効果のある炭素とマンガンの量を多くすることができるようにすると、溶接性に優れたものとすることができるとともに、耐衝撃性を示すシャルピー衝撃エネルギーを著しく向上されることを、実験により確認し、溶接割れ感受性組成（ＰＣＭ）が０．２９以下を満足する中で、銅（Ｃｕ）、ニッケル（Ｎｉ）、クロム（Ｃｒ）、モリブデン（Ｍｏ）、バナジウム（Ｖ）、ボロン（Ｂ）の重量比で表される指標ＰＣＭＥ＝Ｃｕ／２０＋Ｎｉ／６０＋Ｃｒ／２０＋Ｍｏ／１５＋Ｖ／１０＋５Ｂを０．０２８以下とすることにより溶接性と機械的強度を大きく確保しつつ、外力に対する耐衝撃性に優れた鋳鋼製柱梁接合金物の提供が可能となった。 Further, according to the study by the present applicant, while satisfying the weld cracking susceptibility composition (PCM) of 0.29 or less, attention is paid to carbon and manganese effective in improving the strength, and copper (Cu), nickel (Ni ), Chromium (Cr), Molybdenum (Mo), Vanadium (V), Boron (B) The index represented by the weight ratio PCME = Cu / 20 + Ni / 60 + Cr / 20 + Mo / 15 + V / 10 + 5B was found and variously examined. By making it possible to increase the amount of carbon and manganese that are effective in improving the strength, it is possible to achieve excellent weldability and to significantly improve the Charpy impact energy that indicates impact resistance. Confirmed by experiments, while the weld cracking susceptibility composition (PCM) satisfies 0.29 or less, copper (Cu), nickel (Ni), chromium (Cr), molybdenum The index PCME = Cu / 20 + Ni / 60 + Cr / 20 + Mo / 15 + V / 10 + 5B represented by the weight ratio of (Mo), vanadium (V), and boron (B) is 0.028 or less, so that weldability and mechanical strength are achieved. It has become possible to provide cast steel beam-to-column joints with excellent impact resistance against external forces while ensuring a large amount.
さらに、該鋳鋼に含まれる化学成分の内、重量比で銅（Ｃｕ）を０．２０％以下、ニッケル（Ｎｉ）を０．１０％以下、クロム（Ｃｒ）を０．２５％以下、モリブデン（Ｍｏ）を０．１０％以下、バナジウム（Ｖ）を０．０１％以下、ボロン（Ｂ）を０．０００３％以下とすれば、不純物元素が少なく、安定して耐衝撃性の向上を期待できる。 Further, among the chemical components contained in the cast steel, copper (Cu) is 0.20% or less, nickel (Ni) is 0.10% or less, chromium (Cr) is 0.25% or less, and molybdenum ( If Mo) is 0.10% or less, vanadium (V) is 0.01% or less, and boron (B) is 0.0003% or less, the amount of impurity elements is small, and stable improvement in impact resistance can be expected. .
［実施例１］
本発明の請求項１に示す化学成分の重量比内とした図１に示すような角形中空断面の角型柱状体からなる鋳鋼製柱梁接合金物を鋳造により１５ロット製作した。その際、焼ならし９１０℃を３時間、焼戻し６３０℃を３時間の熱処理を加えた。表３に含まれる化学成分の重量比における最大値と最小値および平均値を示す。溶接割れ感受性組成（ＰＣＭ）の平均値は０．２４である。ＰＣＭＥ＝Ｃｕ／２０＋Ｎｉ／６０＋Ｃｒ／２０＋Ｍｏ／１５＋Ｖ／１０＋５Ｂの平均値は０．０１３である。
製作した鋳鋼製柱梁接合金物から ＪＩＳ Ｚ ２２０１及びＪＩＳ Ｚ ２２０２に基づき試験片を切り出し、ＪＩＳ Ｚ ２２４１及びＪＩＳ Ｚ ２２４２に定められた引張試験及び衝撃試験方法に基づき、機械的性質、シャルピー衝撃エネルギーを測定した。その結果を表６に示す。
[Example 1]
Fifteen lots of cast steel beam-to-column joints made of square columnar bodies having a square hollow cross section as shown in FIG. 1 within the weight ratio of chemical components shown in claim 1 of the present invention were produced by casting. At that time, heat treatment was performed at normalizing 910 ° C. for 3 hours and tempering 630 ° C. for 3 hours. The maximum value, the minimum value, and the average value in the weight ratio of the chemical components included in Table 3 are shown. The average value of the weld cracking susceptibility composition (PCM) is 0.24. The average value of PCME = Cu / 20 + Ni / 60 + Cr / 20 + Mo / 15 + V / 10 + 5B is 0.013.
Test pieces were cut out from the manufactured cast steel beam-column joints in accordance with JIS Z 2201 and JIS Z 2202, and mechanical properties and Charpy impact energy were determined based on the tensile test and impact test methods defined in JIS Z 2241 and JIS Z 2242. Was measured. The results are shown in Table 6.
実施例１と比べて溶接割れ感受性組成（ＰＣＭ）を同等に、銅（Ｃｕ）、ニッケル（Ｎｉ）、クロム（Ｃｒ）、モリブデン（Ｍｏ）、バナジウム（Ｖ）、ボロン（Ｂ）の添加を増やし、同様にして鋳鋼製柱梁接合金物を鋳造により１３ロット製作した。その際、同様に焼ならし９１０℃を３時間、焼戻し６３０℃を３時間の熱処理を加えた。表４に含まれる化学成分の重量比における最大値と最小値および平均値を示す。溶接割れ感受性組成（ＰＣＭ）の平均値は０．２４である。ＰＣＭＥ＝Ｃｕ／２０＋Ｎｉ／６０＋Ｃｒ／２０＋Ｍｏ／１５＋Ｖ／１０＋５Ｂの平均値は０．０２４である。
同様に機械的性質、シャルピー衝撃エネルギーを測定した。その結果を表６に示す。
Compared to Example 1, the weld cracking susceptibility composition (PCM) is equivalent, and the addition of copper (Cu), nickel (Ni), chromium (Cr), molybdenum (Mo), vanadium (V), and boron (B) is increased. Similarly, 13 lots of cast steel beam-to-column joints were produced by casting. At that time, heat treatment was similarly performed at 910 ° C. for 3 hours and tempering 630 ° C. for 3 hours. Table 4 shows the maximum value, the minimum value, and the average value in the weight ratio of the chemical components. The average value of the weld cracking susceptibility composition (PCM) is 0.24. The average value of PCME = Cu / 20 + Ni / 60 + Cr / 20 + Mo / 15 + V / 10 + 5B is 0.024.
Similarly, mechanical properties and Charpy impact energy were measured. The results are shown in Table 6.
実施例１と比べて溶接割れ感受性組成（ＰＣＭ）を同等に、銅（Ｃｕ）、ニッケル（Ｎｉ）、クロム（Ｃｒ）、モリブデン（Ｍｏ）、バナジウム（Ｖ）、ボロン（Ｂ）を添加して重量比を増やし、同様にして鋳鋼製柱梁接合金物を鋳造により１ロット製作した。その際、同様に焼ならし９１０℃を３時間、焼戻し６３０℃を３時間の熱処理を加えた。表５に含まれる化学成分値を示す。溶接割れ感受性組成（ＰＣＭ）の値は０．２５である。ＰＣＭＥ＝Ｃｕ／２０＋Ｎｉ／６０＋Ｃｒ／２０＋Ｍｏ／１５＋Ｖ／１０＋５Ｂの値は０．０４５である。
同様に機械的性質、シャルピー衝撃エネルギーを測定した。その結果を表６に示す。
Compared to Example 1, the weld cracking susceptibility composition (PCM) is equivalent, and copper (Cu), nickel (Ni), chromium (Cr), molybdenum (Mo), vanadium (V), and boron (B) are added. The weight ratio was increased, and one lot of cast steel beam-to-column joints was produced in the same manner. At that time, heat treatment was similarly performed at 910 ° C. for 3 hours and tempering 630 ° C. for 3 hours. The chemical component values included in Table 5 are shown. The value of the weld crack susceptibility composition (PCM) is 0.25. The value of PCME = Cu / 20 + Ni / 60 + Cr / 20 + Mo / 15 + V / 10 + 5B is 0.045.
Similarly, mechanical properties and Charpy impact energy were measured. The results are shown in Table 6.
本発明は鉄骨建築物の鉄骨柱と鉄骨梁の接合部に使用される仕口用の鋳鋼製柱梁接合金物として好適に利用できる。 INDUSTRIAL APPLICABILITY The present invention can be suitably used as a cast steel beam-column joint hardware for a joint used in a joint portion between a steel column and a steel beam of a steel building.
１、鉄骨柱
２、鉄骨梁
３、柱梁接合金物
1.
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