JPH0551698A - Steel for bolt and nut excellent in fire-resistance - Google Patents
Steel for bolt and nut excellent in fire-resistanceInfo
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- JPH0551698A JPH0551698A JP6063491A JP6063491A JPH0551698A JP H0551698 A JPH0551698 A JP H0551698A JP 6063491 A JP6063491 A JP 6063491A JP 6063491 A JP6063491 A JP 6063491A JP H0551698 A JPH0551698 A JP H0551698A
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Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、建築構造物に使用され
るボルトおよびナット用鋼であって、詳しくは、常温で
は高力六角ボルト(F10T)、六角ナット(F10) (JIS B 118
6)鋼や高力トルシア形ボルト(F10T) (JSS II 09)鋼と同
等の特性を示し、高温、特に 600℃で40kgf/mm2 以上の
耐力を有する耐火性に優れたボルトおよびナット用鋼に
関するものである。FIELD OF THE INVENTION The present invention relates to a steel for bolts and nuts used in building structures, and more specifically, high-strength hexagon bolts (F10T) and hexagon nuts (F10) (JIS B 118) at room temperature.
6) Steel for bolts and nuts that shows the same characteristics as steel and high-strength torcia bolt (F10T) (JSS II 09) steel and has a proof stress of 40 kgf / mm 2 or more at high temperatures, especially at 600 ° C. It is about.
【０００２】[0002]
【従来の技術】従来、建築構造用鋼材の締結には、JIS
B 1186に定められる高力六角ボルト(F10T)、六角ナット
(F10) やJSS II 09 に定められるトルシア形ボルト(F10
T)などが使用されているが、この種の鋼材は 350℃以上
の高温にさらされると著しく耐力が低下するため、建築
物に火災が発生した場合でもこれらの鋼材の温度が350
℃を超えないように耐火被覆を施すことが法令によって
義務付けられている。2. Description of the Related Art Conventionally, JIS has been used for fastening steel materials for building structures.
High-strength hexagon bolt (F10T) and hexagon nut specified in B 1186
(F10) and torcia bolts (F10
However, even if a fire occurs in a building, the temperature of these steels will be reduced to 350 ° C.
It is obligatory by law to apply fireproof coating so that the temperature does not exceed ℃.
【０００３】一方、昭和51年〜昭和61年に建設省で実施
された総合技術開発プロジェクト「建築物の防火設計法
の開発」の結果、「火災時の安定性」が数値シミュレー
ションおよび実験で確認されれば、耐火物の被覆厚さ
を薄くすること、鉄骨を無被覆で使用すること、が可
能となり、従来よりも鉄骨建築における耐火工法の選択
の自由度が大幅に改善された。即ち、この新耐火設計法
によれば、高温強度に優れた鋼材を使用することによ
り、法令で義務付けられる耐火被覆を削減或いは省略す
ることが可能となり、鉄骨建築の施工コスト、工数の削
減が期待される。On the other hand, as a result of a comprehensive technical development project "Development of fire protection design method for buildings" carried out by the Ministry of Construction from 1976 to 1986, "stability at fire" was confirmed by numerical simulation and experiment. By doing so, it becomes possible to reduce the coating thickness of the refractory material and to use the steel frame without coating, and the degree of freedom in selecting the refractory construction method in steel frame construction has been greatly improved compared to the conventional one. That is, according to this new fireproof design method, it is possible to reduce or omit the fireproof coating required by law by using steel materials having excellent high temperature strength, and it is expected to reduce the construction cost and man-hours of steel-framed construction. To be done.
【０００４】しかしながら、ステンレス鋼や熱間金型用
の合金工具鋼で代表される周知の耐熱鋼材は、高温強度
に優れるものの常温強度が高すぎて加工性に劣るほか、
価格も非常に高いため経済性の面からも建築構造物とし
ては適用が難しい。However, the well-known heat-resistant steel materials represented by stainless steel and alloy tool steels for hot molds are excellent in high temperature strength, but are too high in room temperature strength and poor in workability.
Since the price is also very high, it is difficult to apply as a building structure from the economical aspect.
【０００５】このようなことから、特開平２−247355号
公報に、新耐火設計法に基づく締結部材として、高温特
性に優れたボルトおよびナットと、これらの経済的な製
造方法が提案されている。しかし、この発明のボルトお
よびナットでも 600℃での耐力は高々35.8kgf/mm2 程度
しかなく、建築構造物用耐火ボルトおよびナットとして
は高温耐力が十分にあるとは言い難い。Under these circumstances, Japanese Patent Laid-Open No. 2-247355 proposes bolts and nuts having excellent high-temperature characteristics and economical manufacturing methods thereof as fastening members based on the new fireproof design method. .. However, even with the bolts and nuts of the present invention, the proof stress at 600 ° C. is only about 35.8 kgf / mm 2 at most, and it cannot be said that the high temperature proof stress is sufficient for the fireproof bolts and nuts for building structures.
【０００６】[0006]
【発明が解決しようとする課題】本発明の課題は、高温
耐力をより高めたボルトおよびナット用鋼、具体的に
は、新耐火設計法に基づく建築用耐火鋼材の締結にあた
り、従来の高力六角ボルト(F10T)、六角ナット(F10)鋼
や高力トルシア形ボルト(F10T)鋼と同等の常温特性を示
し、火災時における高温特性がこれらのボルトおよびナ
ット鋼よりも遙かに高い、 600℃で40kgf/mm2 以上の耐
力を有するボルトおよびナット用鋼を提供することにあ
る。DISCLOSURE OF THE INVENTION The object of the present invention is to improve the high-temperature yield strength of steel for bolts and nuts, and more specifically, to consolidate fire-resistant steel materials for construction based on the new fire-resistant design method. It has room temperature characteristics equivalent to those of hexagon bolts (F10T), hexagon nut (F10) steel, and high-strength torcia type bolt (F10T) steel, and its high-temperature characteristics during fire are much higher than those of these bolts and nut steels. To provide a steel for bolts and nuts having a proof stress of 40 kgf / mm 2 or more at ℃.
【０００７】[0007]
【課題を解決するための手段】本発明者は、上記の課題
を達成するため鋼材の化学組成および組織について研究
を行った結果、下記の知見を得た。The present inventor has obtained the following findings as a result of research on the chemical composition and structure of a steel material in order to achieve the above object.
【０００８】1) Moを適正量添加したうえでＣの添加量
を調整することにより、高温における耐力の低下が抑制
される。1) By adding an appropriate amount of Mo and then adjusting the amount of C added, a decrease in yield strength at high temperatures can be suppressed.
【０００９】2) NbをCrおよびMoとともに複合添加し、
且つＮ量を適正に調整することにより、高温における耐
力の低下が著しく抑制される。2) Adding Nb together with Cr and Mo,
In addition, by appropriately adjusting the N content, the decrease in yield strength at high temperatures is significantly suppressed.
【００１０】3) 含有成分を適正に調整したうえで鋼の
組織を焼入れ焼戻し組織にすることにより、常温強度お
よび高温強度が改善される。3) The normal temperature strength and the high temperature strength are improved by appropriately adjusting the contained components and by making the structure of the steel into a quenched and tempered structure.
【００１１】4) 上記の成分に加えて、ＶおよびNiの１
種以上を適正量添加すると、高温での耐力の低下が一層
抑制される。4) In addition to the above components, 1 of V and Ni
Addition of an appropriate amount of seeds or more further suppresses the decrease in yield strength at high temperatures.
【００１２】上記知見に基づく本発明は下記の化学組成
および組織を有するボルトおよびナット用鋼を要旨とす
る。The present invention based on the above findings has as its gist a steel for bolts and nuts having the following chemical composition and structure.
【００１３】(I)重量％で、Ｃ：0.18〜0.33％、Si：0.1
0〜0.50％、Mn：0.40〜1.30％、Cr：0.45〜1.50％、M
o：0.25〜0.65％、Nb： 0.005〜0.15％、Al： 0.005〜
0.10％、Ｎ：0.005 〜 0.030％を含有し、残部がFeおよ
び不可避不純物からなり、焼入れ焼戻し組織を有する耐
火性に優れたボルトおよびナット用鋼。(I)% by weight, C: 0.18 to 0.33%, Si: 0.1
0 to 0.50%, Mn: 0.40 to 1.30%, Cr: 0.45 to 1.50%, M
o: 0.25 to 0.65%, Nb: 0.005 to 0.15%, Al: 0.005 to
Steel for bolts and nuts containing 0.10%, N: 0.005 to 0.030%, the balance consisting of Fe and unavoidable impurities, and having a quenched and tempered structure and excellent in fire resistance.
【００１４】(II)上記(I) に記載の成分に加えて更に、
0.01〜0.15重量％のＶおよび0.10〜0.60重量％のNiのう
ちの１種以上を含有し、焼入れ焼戻し組織を有する耐火
性に優れたボルトおよびナット用鋼。(II) In addition to the components described in (I) above,
A steel for bolts and nuts containing 0.01 to 0.15% by weight of V and 0.10 to 0.60% by weight of Ni, and having a quenching and tempering structure and excellent fire resistance.
【００１５】[0015]
【作用】以下に、本発明における鋼の化学組成および組
織を上記のように限定する理由を説明する。The reason for limiting the chemical composition and structure of steel in the present invention as described above will be explained below.
【００１６】Ａ）鋼の化学組成 Ｃ：Ｃは所望の強度を確保するために添加するが、その
含有量が0.18％未満では添加効果に乏しく、一方、Moの
共存下でＣ含有量が0.33％を超えるとかえって高温での
耐力が低下することになるので、その含有量を0.18〜0.
33％とした。A) Chemical composition of steel C: C is added in order to secure desired strength, but if the content is less than 0.18%, the effect of addition is poor, while in the presence of Mo, the content of C is 0.33. %, The yield strength at high temperature will rather decrease, so the content should be 0.18-0.
33%.
【００１７】Si：Siは鋼の脱酸および強度増加のために
有効な元素であるが、その含有量が0.10％未満では所望
の効果が得られず、0.50％を超えると靱性が劣化するの
みならず、冷間加工性も劣化するようになるので、その
含有量を0.10〜0.50％とした。Si: Si is an element effective for deoxidizing steel and increasing strength, but if its content is less than 0.10%, the desired effect cannot be obtained, and if it exceeds 0.50%, the toughness only deteriorates. However, cold workability also deteriorates, so the content was made 0.10 to 0.50%.
【００１８】Mn：Mnは脱酸のほか強度および靱性を確保
するのに有効な元素である。しかし、その含有量が0.40
％未満では所望の強度が得られず、1.30％を超えると強
度および靱性の向上効果が飽和し、コストのみが上昇す
ることになるので、その含有量を0.40〜1.30％とした。Mn: Mn is an element effective for ensuring strength and toughness in addition to deoxidation. However, its content is 0.40
If it is less than 1.0%, the desired strength cannot be obtained, and if it exceeds 1.30%, the effect of improving the strength and toughness is saturated and only the cost is increased, so the content was made 0.40 to 1.30%.
【００１９】Cr：Crは常温強度および高温強度を向上さ
せる作用がある。特に、MoおよびNbとの複合添加で著し
く高温強度を向上させるが、その含有量が0.45％未満で
は所望の効果が得られず、1.50％を超えると冷間加工性
が劣化するようになるので、その含有量を0.45〜1.50％
とした。Cr: Cr has an effect of improving room temperature strength and high temperature strength. In particular, the combined addition of Mo and Nb significantly improves the high temperature strength, but if the content is less than 0.45% the desired effect is not obtained, and if it exceeds 1.50% the cold workability deteriorates. , Its content 0.45 ~ 1.50%
And
【００２０】Mo：Moは高温強度の向上に極めて有効な元
素であり、特に、CrおよびNbとの複合添加でその効果が
著しい。しかし、その含有量が0.25％未満では所望の高
温強度が得られず、0.65％を超えると前記の効果が飽和
し、経済的に不利を招くことになるので、その含有量を
0.25〜0.65％とした。Mo: Mo is an extremely effective element for improving the high temperature strength, and its effect is particularly remarkable when it is added in combination with Cr and Nb. However, if the content is less than 0.25%, the desired high-temperature strength cannot be obtained, and if it exceeds 0.65%, the above effect is saturated, which is economically disadvantageous.
It was set to 0.25 to 0.65%.
【００２１】Nb：Nbは本発明において重要な元素であ
り、微量の添加で高温強度を向上させる。Nb: Nb is an important element in the present invention, and its addition at a trace amount improves high temperature strength.
【００２２】特に、CrおよびMoとの複合添加で高温強度
を著しく向上させる。その効果を確保するためには 0.0
05％以上の含有量を必要とする。しかし、0.15％を超え
て含有してもその効果は飽和するのみならず、熱間加工
性および冷間加工性を劣化させることになるので、その
含有量を 0.005〜0.15％とした。In particular, the composite addition of Cr and Mo significantly improves the high temperature strength. 0.0 to secure the effect
Requires a content of 05% or more. However, even if the content exceeds 0.15%, not only the effect is saturated but also the hot workability and cold workability are deteriorated, so the content is made 0.005 to 0.15%.
【００２３】Al：Alは鋼の脱酸の安定化および均質化を
図るのに有効な元素である。しかし、その含有量が 0.0
05％未満では所望の効果を得ることができず、0.10％を
超えて含有してもその効果は飽和してしまい、逆に介在
物の増大により疵が発生し、靱性を劣化させることにな
るので、その含有量を 0.005〜0.10％とした。Al: Al is an element effective for stabilizing and homogenizing deoxidation of steel. However, its content is 0.0
If it is less than 05%, the desired effect cannot be obtained, and if it is contained in excess of 0.10%, the effect is saturated, and conversely, the increase of inclusions causes flaws and deteriorates the toughness. Therefore, the content is set to 0.005 to 0.10%.
【００２４】Ｎ：Ｎは本発明鋼の成分系では高温強度の
向上に寄与する有効な元素であるが、その含有量が 0.0
05％未満では所望の効果が得られないので、下限を0.00
5 ％とした。一方、低合金鋼において 0.030％を超える
Ｎ量を含有させることは難しいので、上限を 0.030％と
した。N: N is an effective element that contributes to the improvement of high temperature strength in the composition system of the steel of the present invention, but its content is 0.0
If it is less than 05%, the desired effect cannot be obtained, so the lower limit is 0.00.
It was set to 5%. On the other hand, it is difficult to make the low alloy steel contain N in excess of 0.030%, so the upper limit was made 0.030%.
【００２５】ＶおよびNi：Ｖには常温強度および高温強
度を向上させる作用があり、Niには強度と靱性を向上さ
せる作用があるので、より以上の高強度や靭性を求めら
れる場合は、必要に応じて１種以上添加してもよい。し
かし、Ｖの場合には0.01％未満では所望の効果が得られ
ず、0.15％を超えるとその効果が飽和し、コストの上昇
を招くのみならず、靭性の劣化をきたすので、Ｖを添加
する場合は0.01〜0.15％の含有量とするのがよい。一
方、Niの場合にも0.10％未満ではその効果に乏しく、0.
60％を超えると冷間加工性の劣化をきたすようになるの
で、Niを添加する場合は0.10〜0.60％の含有量とするの
がよい。V and Ni: V has an effect of improving room temperature strength and high temperature strength, and Ni has an effect of improving strength and toughness. Therefore, when higher strength or toughness is required, it is necessary. You may add 1 or more types according to the. However, in the case of V, if less than 0.01%, the desired effect cannot be obtained, and if it exceeds 0.15%, the effect is saturated and not only the cost rises but also the toughness deteriorates. Therefore, V is added. In this case, the content should be 0.01 to 0.15%. On the other hand, in the case of Ni as well, its effect is poor at less than 0.10%.
If it exceeds 60%, the cold workability will be deteriorated. Therefore, when Ni is added, the content should be 0.10 to 0.60%.
【００２６】Ｂ）鋼の組織 上記の化学組成を有する鋼であっても、その組織がフェ
ライト、パーライト、高温ベイナイトといったいわゆる
高温変態生成物からなるものでは目的とする常温強度お
よび高温強度が得られない。常温強度が従来のボルトお
よびナット用鋼と同等以上で、高温強度、特に 600℃で
の耐力が40kgf/mm2 以上のものとするためには、焼入れ
および焼戻し処理して、鋼の組織を焼入れ焼戻し組織と
する必要がある。B) Steel Microstructure Even if the steel has the above chemical composition, if the microstructure consists of so-called high temperature transformation products such as ferrite, pearlite and high temperature bainite, the desired room temperature strength and high temperature strength can be obtained. Absent. In order to have room temperature strength equal to or higher than that of conventional bolt and nut steels, and high temperature strength, especially yield strength at 600 ° C of 40kgf / mm 2 or more, quenching and tempering treatment is performed to quench the steel structure. A tempered structure is required.
【００２７】なお、鋼の組織を焼入れ焼戻し組織とする
際の焼入れ処理は、熱間加工後の高温の鋼を直ちに急冷
して焼入れするいわゆる直接焼入れ法によって行っても
よく、熱間加工後の高温の鋼を一旦室温まで冷却した
後、再加熱して焼入れする方法によって行ってもよい。The quenching treatment for making the structure of the steel into a quenched and tempered structure may be carried out by a so-called direct quenching method in which the high temperature steel after hot working is immediately quenched and quenched. The high temperature steel may be once cooled to room temperature, then reheated and quenched.
【００２８】[0028]
【実施例】表１に示す化学組成の鋼を通常の方法によっ
て溶製した。表１において、鋼Ａ〜Ｆは本発明鋼、鋼Ｇ
〜Ｋは成分のいずれかが本発明で規定する含有量の範囲
から外れた比較鋼である。EXAMPLE Steels having the chemical compositions shown in Table 1 were melted by a usual method. In Table 1, steels A to F are steels of the present invention and steels G
K is a comparative steel in which any of the components is out of the range of the content specified in the present invention.
【００２９】次いで、これらの本発明鋼および比較鋼を
連続鋳造法或いは造塊法によって鋼片となした後、1200
〜1250℃の温度に加熱してから、25mm径の丸棒に熱間圧
延し、一部のものは熱間圧延後、 920〜1020℃の温度か
ら直ちに焼入れを行った。他のものは熱間圧延後、一旦
室温まで冷却し、 850〜930 ℃の温度に再加熱して焼入
れを行った。しかるのち、全ての丸棒を 420〜 680℃の
温度で焼戻しを行い、その組織が焼入れ焼戻し組織にな
るように調整した。Next, these invented steels and comparative steels were made into billets by a continuous casting method or an ingot making method, and then 1200
After heating to a temperature of ~ 1250 ° C, it was hot-rolled into a round bar with a diameter of 25 mm, and some of them were hot-rolled and then immediately quenched from a temperature of 920-1020 ° C. Others were hot-rolled, once cooled to room temperature, and then reheated to a temperature of 850 to 930 ° C for quenching. After that, all the round bars were tempered at a temperature of 420 to 680 ° C. and adjusted so that the structure became a quenched and tempered structure.
【００３０】こうして得られた焼入れ焼戻し後の丸棒か
ら試験片を切り出し、常温および600℃における引張特
性を調査した。その結果を焼入れおよび焼戻し温度とと
もに表２に示す。Test pieces were cut out from the round bar after quenching and tempering thus obtained, and the tensile properties at room temperature and 600 ° C. were investigated. The results are shown in Table 2 together with the quenching and tempering temperatures.
【００３１】[0031]
【表１】 [Table 1]
【００３２】[0032]
【表２】 [Table 2]
【００３３】表２から、本発明鋼は常温強度および高温
強度ともに良好な特性値を有しており、新耐火設計法に
基づく締結部材（ボルト、ナット）用鋼として優れた鋼
であることがわかる。これに対して比較鋼は常温強度は
本発明鋼とほぼ同等であるが、高温強度が著しく低い。From Table 2, it can be seen that the steel of the present invention has good characteristic values in both room temperature strength and high temperature strength, and is an excellent steel for fastening members (bolts, nuts) based on the new fireproof design method. Recognize. On the other hand, the comparative steel has almost the same room temperature strength as the steel of the present invention, but the high temperature strength is remarkably low.
【００３４】[0034]
【発明の効果】以上説明したように、本発明鋼は高温特
性が著しく改善されている上に、常温強度も高いから、
新耐火設計法に基づく建築用耐火鋼材の締結のためのボ
ルトおよびナット用鋼として利用することができる。As described above, the steel of the present invention has significantly improved high temperature properties and high room temperature strength.
It can be used as steel for bolts and nuts for fastening construction fireproof steel materials based on the new fireproof design method.
Claims (2)
0.50％、Mn：0.40〜1.30％、Cr：0.45〜1.50％、Mo：0.
25〜0.65％、Nb： 0.005〜0.15％、Al： 0.005〜0.10
％、Ｎ：0.005 〜 0.030％を含有し、残部がFeおよび不
可避不純物からなり、焼入れ焼戻し組織を有する耐火性
に優れたボルトおよびナット用鋼。1. By weight%, C: 0.18-0.33%, Si: 0.10-
0.50%, Mn: 0.40 to 1.30%, Cr: 0.45 to 1.50%, Mo: 0.
25-0.65%, Nb: 0.005-0.15%, Al: 0.005-0.10
%, N: 0.005 to 0.030%, the balance being Fe and unavoidable impurities, and a steel for bolts and nuts having a quenching and tempering structure and excellent fire resistance.
〜0.15重量％のＶおよび0.10〜0.60重量％のNiのうちの
１種以上を含有し、焼入れ焼戻し組織を有する耐火性に
優れたボルトおよびナット用鋼。2. The composition according to claim 1, further comprising 0.01
Steel for bolts and nuts containing at least one of 0.1 to 0.15 wt% V and 0.10 to 0.60 wt% Ni, and having a quenching and tempering structure and excellent fire resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3060634A JP2551251B2 (en) | 1991-03-26 | 1991-03-26 | Steel for bolts and nuts with excellent fire resistance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3060634A JP2551251B2 (en) | 1991-03-26 | 1991-03-26 | Steel for bolts and nuts with excellent fire resistance |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0551698A true JPH0551698A (en) | 1993-03-02 |
| JP2551251B2 JP2551251B2 (en) | 1996-11-06 |
Family
ID=13147944
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3060634A Expired - Fee Related JP2551251B2 (en) | 1991-03-26 | 1991-03-26 | Steel for bolts and nuts with excellent fire resistance |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2551251B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0585889U (en) * | 1993-03-23 | 1993-11-19 | 金井 宏之 | Interior material |
| KR20200021754A (en) * | 2018-08-21 | 2020-03-02 | 주식회사 포스코 | High-strength wire rod with excellent hydrogen brittleness resistance, steel for volt using the same, and methods for manufacturing thereof |
| CN116024499A (en) * | 2022-12-28 | 2023-04-28 | 燕山大学 | Steel for 10.9-grade bolt resistant to hydrogen-induced delayed fracture and preparation method of 10.9-grade bolt |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59107063A (en) * | 1982-12-10 | 1984-06-21 | Daido Steel Co Ltd | Wire rod for bolt and its production |
| JPS6164815A (en) * | 1984-09-03 | 1986-04-03 | Sumitomo Metal Ind Ltd | Manufacture of high strength steel excellent in delay breakdown resistance |
| JPS6293343A (en) * | 1985-10-17 | 1987-04-28 | Daido Steel Co Ltd | Non-heattreated steel wire |
| JPS63161117A (en) * | 1986-12-24 | 1988-07-04 | Kobe Steel Ltd | Production of hot rolled steel products having high strength and high toughness |
| JPH02217437A (en) * | 1989-02-20 | 1990-08-30 | Sumitomo Metal Ind Ltd | Steel for cold working |
-
1991
- 1991-03-26 JP JP3060634A patent/JP2551251B2/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59107063A (en) * | 1982-12-10 | 1984-06-21 | Daido Steel Co Ltd | Wire rod for bolt and its production |
| JPS6164815A (en) * | 1984-09-03 | 1986-04-03 | Sumitomo Metal Ind Ltd | Manufacture of high strength steel excellent in delay breakdown resistance |
| JPS6293343A (en) * | 1985-10-17 | 1987-04-28 | Daido Steel Co Ltd | Non-heattreated steel wire |
| JPS63161117A (en) * | 1986-12-24 | 1988-07-04 | Kobe Steel Ltd | Production of hot rolled steel products having high strength and high toughness |
| JPH02217437A (en) * | 1989-02-20 | 1990-08-30 | Sumitomo Metal Ind Ltd | Steel for cold working |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0585889U (en) * | 1993-03-23 | 1993-11-19 | 金井 宏之 | Interior material |
| KR20200021754A (en) * | 2018-08-21 | 2020-03-02 | 주식회사 포스코 | High-strength wire rod with excellent hydrogen brittleness resistance, steel for volt using the same, and methods for manufacturing thereof |
| CN116024499A (en) * | 2022-12-28 | 2023-04-28 | 燕山大学 | Steel for 10.9-grade bolt resistant to hydrogen-induced delayed fracture and preparation method of 10.9-grade bolt |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2551251B2 (en) | 1996-11-06 |
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|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |