JP2907942B2 - Steel materials for building structures with excellent weather resistance and fire resistance - Google Patents
Steel materials for building structures with excellent weather resistance and fire resistanceInfo
- Publication number
- JP2907942B2 JP2907942B2 JP10745790A JP10745790A JP2907942B2 JP 2907942 B2 JP2907942 B2 JP 2907942B2 JP 10745790 A JP10745790 A JP 10745790A JP 10745790 A JP10745790 A JP 10745790A JP 2907942 B2 JP2907942 B2 JP 2907942B2
- Authority
- JP
- Japan
- Prior art keywords
- steel
- building structures
- proof stress
- strength
- weather resistance
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
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- Heat Treatment Of Steel (AREA)
Description
【発明の詳細な説明】 ＜産業上の利用分野＞ 本発明は、建築構造物に使用される鋼材に係わるもの
で、常温における強度、靭性および溶接性などはJIS規
格溶接構造用耐候性鋼材（SMA50）と同等の特性値を維
持した上で高温での耐力の一層の向上を図ったものであ
る。DETAILED DESCRIPTION OF THE INVENTION <Industrial application field> The present invention relates to a steel material used for a building structure. The strength, toughness, weldability, etc. at normal temperature of a weather-resistant steel material for a JIS standard welded structure ( SMA50), while maintaining the same characteristic values as above and further improving the proof stress at high temperatures.
＜従来の技術＞ 屋外に設置する柱や梁などの建築構造用鋼材として
は、JIS G 3114「溶接構造用耐候性熱間圧延鋼材」など
に規定されている鋼材が使用されているが、これらの鋼
材は350℃以上の高温になると著しく耐力が低下するた
め、建築物に火災が発生しても鋼材の温度が350℃以下
になるよう耐火被覆を施すことが義務づけられている。
このような耐火被覆の使用は施工コストを上昇させるだ
けでなく、建築物のデザイン美観を損なう。<Conventional technology> Steel materials specified in JIS G 3114 “Weatherproof hot-rolled steel materials for welded structures” are used as steel materials for building structures such as columns and beams installed outdoors. Since the steel material has a markedly reduced proof stress at temperatures higher than 350 ° C, it is mandatory to apply a fire-resistant coating so that the temperature of the steel material will be 350 ° C or less even if a fire occurs in the building.
The use of such refractory coatings not only increases construction costs, but also impairs the design aesthetics of the building.
耐火被覆の減厚または無使用を可能とするため高温に
おいても高い耐力を有する鋼材が求められている。A steel material having a high proof stress even at a high temperature is demanded in order to make the refractory coating thin or useless.
しかしながら、従来の1/2Mo鋼、1Cr−1/2Mo鋼などの
高温用鋼は、高温での耐力は高いが、常温での強度が高
すぎ加工性に難点があるとともに、溶接性もSMA50鋼な
どに比べて著しく劣るために、建築構造物用には適用で
きない。However, conventional high-temperature steels such as 1 / 2Mo steel and 1Cr-1 / 2Mo steel have high proof stress at high temperatures, but have too high strength at room temperature to have difficulties in workability and also have poor weldability with SMA50 steel. It cannot be used for building structures because it is significantly inferior to the above.
また、特公昭56−31867号公報、特開昭57−140855号
公報、特開昭57−174435号公報などに、上記1/2Mo鋼、1
Cr−1/2Mo鋼などの合金元素量を低減して溶接性を改良
した高温用鋼が示されているが、これらの鋼も建築構造
物用耐火鋼としては高温での耐力が十分とはいい難く、
しかも常温強度が高く、また、溶接性が劣るという欠点
もある。In addition, JP-B-56-31867, JP-A-57-140855, JP-A-57-174435 and the like, the above 1 / 2Mo steel, 1
High-temperature steels with improved weldability by reducing the amount of alloying elements such as Cr-1 / 2Mo steel have been shown, but these steels also do not have sufficient strength at high temperatures as fire-resistant steel for building structures. Difficult
In addition, there are disadvantages that the room temperature strength is high and the weldability is poor.
＜発明が解決しようとする課題＞ 本発明の目的は、従来の高温用低合金鋼に比べて溶接
性に優れ、また従来の溶接構造用耐候性鋼よりも高温強
度（特に降伏強さまたは耐力）が高く、かつ常温強度、
靭性、耐候性などは同等である経済的な建築構造物用耐
候性耐火鋼材を提供することにある。<Problems to be Solved by the Invention> An object of the present invention is to improve the weldability as compared with conventional low-alloy steels for high temperatures, and to provide high-temperature strength (particularly yield strength or proof stress) compared to conventional weatherable steels for welded structures. ) High and room temperature strength,
It is an object of the present invention to provide an economical weather-resistant refractory steel material for a building structure having the same toughness and weather resistance.
＜課題を解決するための手段＞ 本発明者らは、上記目的を達成すべく鋼材の成分組成
について鋭意検討した。その結果、Moを適正量添加した
うえで、Mn含有量を限定することにより高温での耐力低
下を抑制できること、及びCu、Cr、Niなどの含有で耐候
性を維持できること、さらにＶを微量添加してPCMの増
大を抑えて常・高温の耐力が確保できることの知見を得
た。これにより、常温強度、靭性、溶接性は従来の溶接
耐耐候性構造用鋼と同等以上であって、しかも高温にお
ける耐力、例えば600℃における耐力が常温における耐
力の67％とすることができることを見出したものであ
る。<Means for Solving the Problems> The present inventors have diligently studied the component composition of a steel material to achieve the above object. As a result, after adding an appropriate amount of Mo, it is possible to suppress a decrease in proof stress at high temperatures by limiting the Mn content, and it is possible to maintain weather resistance by containing Cu, Cr, Ni, etc., and to add a small amount of V the normally-high-temperature yield strength by suppressing the increase of P CM was obtained a finding that can be secured to. As a result, the room temperature strength, toughness, and weldability are equal to or higher than those of conventional welded weathering resistant structural steel, and the proof stress at high temperatures, for example, the proof stress at 600 ° C can be 67% of the proof stress at normal temperature. It was found.
すなわち、本発明は、重量％にて、C:0.03〜0.15％、
Si:0.05〜0.70％、Mn:0.10〜0.80％、Mo:0.20〜0.80
％、Cu:0.20〜1.00％、Cr:0.40超〜1.00％、Ni:0.05〜
0.50％を含有し、残部がFe及び不可避的不純物よりな
り、かつ下記に示す炭素当量（Ceq）が0.45％以下であ
ることを特徴とする建築構造用耐候性耐火鋼材であり、
また、重量％にて、C:0.03〜0.15％、Si:0.05〜0.70
％、Mn:0.10〜0.80％、Mo:0.20〜0.80％、Cu:0.20〜1.0
0％、Cr:0.40超〜1.00％、Ni:0.05〜0.50％を含み、さ
らにV:0.005〜0.10％を含有し、残部がFe及び不可避的
不純物よりなり、かつ下記に示す炭素当量（Ceq）が0.4
5％以下であることを特徴とする建築構造用耐候性耐火
鋼である。That is, the present invention provides, by weight%, C: 0.03 to 0.15%,
Si: 0.05-0.70%, Mn: 0.10-0.80%, Mo: 0.20-0.80
%, Cu: 0.20 to 1.00%, Cr: 0.40 to 1.00%, Ni: 0.05 to
0.50%, the balance consists of Fe and inevitable impurities, and the carbon equivalent (Ceq) shown below is 0.45% or less, a weather-resistant fire-resistant steel material for building structures,
Also, by weight%, C: 0.03 to 0.15%, Si: 0.05 to 0.70
%, Mn: 0.10 to 0.80%, Mo: 0.20 to 0.80%, Cu: 0.20 to 1.0
0%, Cr: more than 0.40 to 1.00%, Ni: 0.05 to 0.50%, V: 0.005 to 0.10%, the balance is Fe and unavoidable impurities, and the carbon equivalent (Ceq) shown below Is 0.4
It is a weather-resistant fire-resistant steel for building structures characterized by being 5% or less.
＜作 用＞ まず、この発明で、成分組成を上記の範囲に限定した
理由について説明する。 <Operation> First, the reason for limiting the component composition to the above range in the present invention will be described.
C:0.03〜0.15wt％（以下単に％と表記） Ｃは所定の強度を確保するために添加するが、0.03％
未満では効果がなく、また0.15％を超えると溶接性、靭
性が阻害されるため、上限を0.15％とし、下限を0.03％
とした。C: 0.03 to 0.15 wt% (hereinafter simply referred to as%) C is added to secure a predetermined strength.
If the amount is less than 0.15%, there is no effect, and if it exceeds 0.15%, the weldability and toughness are impaired.
And
Si:0.05〜0.70％ Siは製鋼時の脱酸剤及び強度向上元素として添加する
が、0.05％未満ではその効果がなく、また0.70％を超え
ると靭性が著しく低下するので0.05〜0.70％の範囲とし
た。Si: 0.05-0.70% Si is added as a deoxidizing agent and a strength improving element at the time of steel making. However, if it is less than 0.05%, there is no effect, and if it exceeds 0.70%, the toughness is remarkably reduced, so the range is 0.05-0.70%. And
Mn:0.10〜0.80％ Mnは常温強度を確保するために0.10％以上添加する
が、Mnの多量添加は常温耐力の向上効果に比べ、高温に
おける耐力向上効果が小さく、溶接性も劣化させるの
で、Mn量の上限を0.80％とした。Mn: 0.10 to 0.80% Mn is added at 0.10% or more in order to secure room temperature strength. The upper limit of the Mn content was set to 0.80%.
第１図に、600℃における降伏点または耐力と常温に
おけるそれとの比と、Mn量との関係を示す。同図から明
らかなように、Mnが0.80％を超えると高温における降伏
点、耐力は常温強度に比べ急激に低下している。FIG. 1 shows the relationship between the yield point or proof stress at 600 ° C. and the ratio between it at room temperature and the amount of Mn. As is clear from the figure, when Mn exceeds 0.80%, the yield point and proof stress at high temperatures are sharply reduced as compared with the room temperature strength.
Mo:0.20〜0.80％ Moは高温強度の向上に著しく有効な元素であるが、0.
20％未満ではその効果が少ないが、0.80％を超すと溶接
性、靭性を劣化させるとともに経済的にも不利となるた
め上限を0.80％、下限を0.20％とした。Mo: 0.20 to 0.80% Mo is an element that is remarkably effective in improving high-temperature strength.
If it is less than 20%, the effect is small, but if it exceeds 0.80%, the weldability and toughness are deteriorated and it is economically disadvantageous. Therefore, the upper limit is set to 0.80% and the lower limit is set to 0.20%.
Cu:0.20〜1.00％、Cr:0.40超〜1.00％、 Ni:0.05〜0.50％ Cu、Cr、Niは耐候性向上に有効な元素であり、また強
度向上にも有効な元素である。Cuは0.2％未満では、Cr
は0.40％以下では、Niは0.05％未満ではこれらの効果が
少ないのでこれを下限とした。一方、Cuは１％を超える
と熱間加工性を劣化合させるので上限を1.00％とした。
Crは溶接性の点から上限を1.00％とした。Niは耐候性向
上効果が0.50％以上では少なく、経済性の点から上限を
0.50％とした。Cu: 0.20 to 1.00%, Cr: more than 0.40 to 1.00%, Ni: 0.05 to 0.50% Cu, Cr and Ni are effective elements for improving weather resistance and also for improving strength. If Cu is less than 0.2%, Cr
If the content is 0.40% or less, and if the content of Ni is less than 0.05%, these effects are small. On the other hand, if Cu exceeds 1%, the hot workability deteriorates, so the upper limit was made 1.00%.
The upper limit of Cr is set to 1.00% from the viewpoint of weldability. Ni has little effect of improving weather resistance at 0.50% or more.
0.50%.
V:0.005〜0.10％ Ｖは常温及び高温強度の向上に有効な元素であり、0.
005％以上添加するが、0.10％を超すと溶接性及び靭性
が低下するため上限を0.10％とした。V: 0.005 to 0.10% V is an element effective for improving the strength at room temperature and high temperature.
005% or more is added, but if it exceeds 0.10%, the weldability and toughness decrease, so the upper limit was made 0.10%.
上記各成分の限定範囲に加え、常温強度、溶接性をJI
S規格溶接構造用耐候性SMA50などと同程度とするため、
炭素当量（Ceq）の上限を0.45％とした。In addition to the above-mentioned limited ranges of each component, JI
In order to make it the same level as S-standard welded structure weather resistance SMA50, etc.
The upper limit of the carbon equivalent (Ceq) was set to 0.45%.
この発明鋼を製造するに当たっては、転炉または電気
炉で溶製し、ついで連続鋳造または造塊→分塊法によっ
てスラブとしたのち、厚板圧延あるいは条鋼圧延によっ
て鋼板または形鋼とする方法がとりわけ有利に適合する
が、かような構造法だけに限定されるものではない。ま
た、圧延後の冷却は、放冷あるいは加速冷却を施すこと
ができる。加速冷却により合金元素量の低減が可能であ
り、有利である。In producing the steel of the present invention, a method of smelting in a converter or an electric furnace, and then forming a slab by continuous casting or ingot-forming → ingot-forming method, and then forming a steel plate or a shaped steel by plate rolling or strip rolling. It is particularly advantageous but not limited to such a construction method. In addition, cooling after rolling can be performed by cooling or accelerated cooling. Advantageously, the amount of alloying elements can be reduced by accelerated cooling.
＜実施例＞ 第１表に示す成分組成の溶鋼から200mm厚のスラブを
作製し、熱間圧延により40〜80mmの鋼板とし、室温まで
放冷したもの及び熱間圧延後600℃まで加速冷却し、そ
の後放冷したものについて、常温及び600℃での引張特
性、０℃における母材及び入熱50kJ/cmの溶接ボンド部
の靭性大気暴露試験（工業地帯１年間）による腐食減量
を第２表に示す。<Example> A 200 mm thick slab was prepared from molten steel having the composition shown in Table 1 and was hot-rolled into a 40-80 mm steel sheet. The steel sheet was allowed to cool to room temperature and accelerated to 600 ° C after hot rolling. Table 2 shows the tensile properties at room temperature and 600 ° C, and the corrosion loss of the base metal at 0 ° C and the weld bond at a heat input of 50 kJ / cm in a tough air exposure test (one year in an industrial area). Shown in
第１表中A,B,D,F鋼が本発明鋼、Ｈ〜Ｋ鋼が比較鋼で
ある。Ｈ鋼は通常の溶接構造用圧延鋼材SM50で、腐食減
量が多く、高温での耐力低下が著しい。Ｈ鋼以外はCu、
Cr（Ni）を含有しており、腐食減量は少なく良好な耐候
性を備えている。Ｉ鋼は通常の溶接構造用耐候性鋼材SM
A50で、高温での耐力が著しく低下している。In Table 1, A, B, D, and F steels are steels of the present invention, and H to K steels are comparative steels. H steel is a normal rolled steel material for welded structure SM50, which has a large amount of corrosion loss and a remarkable decrease in proof stress at high temperatures. Cu, except H steel
Contains Cr (Ni), has low corrosion weight loss, and has good weather resistance. Steel I is a normal weather resistant steel material for welded structures SM
At A50, the proof stress at high temperatures is significantly reduced.
Ｊ鋼は本発明の成分範囲からMn量の上限を超えている
もので、高温での耐力低下が大きい。Ｋ鋼は本発明のCe
qの上限を超えているもので、高温強度は十分である
が、常温強度が過度に高く、溶接性が劣っている。J steel exceeds the upper limit of the Mn content from the component range of the present invention, and has a large decrease in proof stress at high temperatures. K steel is the Ce of the present invention.
Since the value exceeds the upper limit of q, the high temperature strength is sufficient, but the room temperature strength is excessively high and the weldability is poor.
これに対し、本発明鋼のA,B,D,F鋼は耐候性に優れ、
高温での耐力低下も小さく、溶接ボンド部の靭性も良好
で、建築構造物用耐候性耐火材として優れた鋼である。In contrast, A, B, D, and F steels of the present invention have excellent weather resistance,
It is a steel that has a small decrease in proof stress at high temperatures and good toughness of the weld bond, and is excellent as a weather-resistant refractory material for building structures.
＜発明の効果＞ 本発明鋼は屋外の建築構造物に使用される鋼材とし
て、常温強度、靭性、溶接性は従来の溶接構造用耐候性
圧延鋼材と同等であって、しかも高温における耐力低下
が小さく、従来鋼の350℃までの許容応力を600℃まで上
昇させることができるようになり、耐火被覆の減少など
建築物の施工上極めて高い効果が得られる。 <Effect of the Invention> The steel of the present invention is used as a steel material for outdoor building structures, and has room temperature strength, toughness, and weldability equivalent to those of a conventional weather-resistant rolled steel material for a welded structure. It is small, and the allowable stress of conventional steel up to 350 ° C can be increased to 600 ° C, and extremely high effects on building construction such as reduction of fireproof coating can be obtained.
第１図は600℃における耐力と常温における耐力の比に
及ぼすMn量の影響を示すグラフである。FIG. 1 is a graph showing the effect of the amount of Mn on the ratio between the proof stress at 600 ° C. and the proof stress at room temperature.
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 平２−85336（ＪＰ，Ａ) 特開 平２−254133（ＪＰ，Ａ) 特開 平３−39418（ＪＰ，Ａ) 特開 平３−173715（ＪＰ，Ａ) 特開 平３−180442（ＪＰ，Ａ) 特開 平２−254134（ＪＰ，Ａ) (58)調査した分野(Int.Cl.6，ＤＢ名) C22C 38/00 - 38/60 ────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-2-85336 (JP, A) JP-A-2-254133 (JP, A) JP-A-3-39418 (JP, A) JP-A-3-39418 173715 (JP, A) JP-A-3-180442 (JP, A) JP-A-2-254134 (JP, A) (58) Fields investigated (Int. Cl. 6 , DB name) C22C 38/00-38 / 60
Claims (2)
下記に示す炭素当量（Ceq）が0.45％以下であることを
特徴とする建築構造用耐候性耐火鋼材。 記 [Claim 1] C: 0.03 to 0.15%, Si: 0.05 to 0.70%, Mn: 0.10 to 0.80%, Mo: 0.20 to 0.80%, Cu: 0.20 to 1.00%, Cr: more than 0.40% by weight% 1.00%, Ni: 0.05 to 0.50%, the balance being Fe and unavoidable impurities, and the carbon equivalent (Ceq) shown below is 0.45% or less. . Record
物よりなり、かつ下記に示す炭素当量（Ceq）が0.45％
以下であることを特徴とする建築構造用耐候性耐火鋼。 記 2. In% by weight, C: 0.03 to 0.15%, Si: 0.05 to 0.70%, Mn: 0.10 to 0.80%, Mo: 0.20 to 0.80%, Cu: 0.20 to 1.00%, Cr: more than 0.40 ~ 1.00%, Ni: 0.05 to 0.50%, V: 0.005 to 0.10%, the balance is Fe and unavoidable impurities, and the carbon equivalent (Ceq) shown below is 0.45%
A weather-resistant fire-resistant steel for building structures characterized by the following. Record
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10745790A JP2907942B2 (en) | 1990-04-25 | 1990-04-25 | Steel materials for building structures with excellent weather resistance and fire resistance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10745790A JP2907942B2 (en) | 1990-04-25 | 1990-04-25 | Steel materials for building structures with excellent weather resistance and fire resistance |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH046245A JPH046245A (en) | 1992-01-10 |
| JP2907942B2 true JP2907942B2 (en) | 1999-06-21 |
Family
ID=14459657
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10745790A Expired - Fee Related JP2907942B2 (en) | 1990-04-25 | 1990-04-25 | Steel materials for building structures with excellent weather resistance and fire resistance |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2907942B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102560256A (en) * | 2012-02-29 | 2012-07-11 | 江苏省沙钢钢铁研究院有限公司 | Fire-resistant weather-resistant steel with excellent low temperature toughness and preparation method for fire-resistant weather-resistant steel |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4586489B2 (en) * | 2004-10-22 | 2010-11-24 | 住友金属工業株式会社 | Steel and structures with excellent beach weather resistance |
| CN103774787A (en) * | 2014-01-22 | 2014-05-07 | 百安力钢结构应用科技有限公司 | Structural thin-walled cold-bending component |
| CN109680205A (en) * | 2019-03-04 | 2019-04-26 | 徐超 | A kind of preparation method of boiler material |
-
1990
- 1990-04-25 JP JP10745790A patent/JP2907942B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102560256A (en) * | 2012-02-29 | 2012-07-11 | 江苏省沙钢钢铁研究院有限公司 | Fire-resistant weather-resistant steel with excellent low temperature toughness and preparation method for fire-resistant weather-resistant steel |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH046245A (en) | 1992-01-10 |
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