JPH04168228A - Method for annealing dead soft steel strip - Google Patents
Method for annealing dead soft steel stripInfo
- Publication number
- JPH04168228A JPH04168228A JP29512890A JP29512890A JPH04168228A JP H04168228 A JPH04168228 A JP H04168228A JP 29512890 A JP29512890 A JP 29512890A JP 29512890 A JP29512890 A JP 29512890A JP H04168228 A JPH04168228 A JP H04168228A
- Authority
- JP
- Japan
- Prior art keywords
- coil
- annealing
- inner cover
- steel strip
- hydrogen gas
- 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.)
- Pending
Links
- 238000000137 annealing Methods 0.000 title claims abstract description 49
- 238000000034 method Methods 0.000 title claims description 11
- 229910000831 Steel Inorganic materials 0.000 title abstract description 8
- 239000010959 steel Substances 0.000 title abstract description 8
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims abstract description 30
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 9
- 229910001209 Low-carbon steel Inorganic materials 0.000 claims description 13
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 7
- 229910000975 Carbon steel Inorganic materials 0.000 claims description 2
- 239000010962 carbon steel Substances 0.000 claims description 2
- 238000010438 heat treatment Methods 0.000 abstract description 7
- 238000013021 overheating Methods 0.000 abstract description 2
- 239000001257 hydrogen Substances 0.000 description 16
- 229910052739 hydrogen Inorganic materials 0.000 description 16
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 12
- 239000007789 gas Substances 0.000 description 10
- 229910052757 nitrogen Inorganic materials 0.000 description 6
- 230000002093 peripheral effect Effects 0.000 description 6
- 239000010960 cold rolled steel Substances 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- 238000007796 conventional method Methods 0.000 description 4
- 238000001816 cooling Methods 0.000 description 4
- 230000007547 defect Effects 0.000 description 4
- 238000005096 rolling process Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000001953 recrystallisation Methods 0.000 description 3
- 238000009864 tensile test Methods 0.000 description 3
- 238000012546 transfer Methods 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 238000010000 carbonizing Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000005261 decarburization Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000005485 electric heating Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229910052738 indium Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000005121 nitriding Methods 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 239000001294 propane Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Heat Treatment Of Sheet Steel (AREA)
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
この発明は、タイト焼鈍炉において、極低炭素鋼帯をほ
ぼ１００％の水素ガス雰囲気下で焼鈍する方法に関する
。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a method for annealing ultra-low carbon steel strip in a tight annealing furnace under a nearly 100% hydrogen gas atmosphere.
従来の技術
冷延鋼板や電気メツキ鋼板で超深絞り鋼板を製造するに
は、炭素含有量０．００６０ｗｔ％以下の極低炭素鋼材
を熱間圧延したのち、圧下率５０〜９０％の範囲で冷間
圧延し、その後再結晶温度以上の温度で連続焼鈍し、調
質圧延を施すか、あるいは炭素含有量０．０４〜０．０
６％の通常の冷延鋼帯をオーブンコイル焼鈍炉を用いて
脱炭焼鈍して調質圧延するのが一般的な製造方法である
。Conventional technology To produce ultra-deep drawn steel sheets using cold-rolled steel sheets or electroplated steel sheets, ultra-low carbon steel with a carbon content of 0.0060 wt% or less is hot-rolled and then rolled at a reduction rate of 50 to 90%. Cold rolled, then continuously annealed at a temperature higher than the recrystallization temperature, and temper rolled, or carbon content 0.04 to 0.0
A common manufacturing method is to decarburize an ordinary 6% cold-rolled steel strip using an oven coil annealing furnace and then temper-roll it.
しかしながら、連続焼鈍炉やオーブンコイル焼鈍炉を使
用することなく、タイト焼鈍炉を用いて超深絞り鋼板を
製造する場合があり得る。この場合、極低炭素鋼帯は、
通常の冷延鋼帯に比較して再結晶温度が高く、変態温度
も高い。このため、通常の冷延鋼帯の最適焼鈍温度であ
る６２０〜７００℃よりも高い温度で焼鈍する必要があ
り、コイル。However, there may be cases where an ultra-deep drawn steel plate is manufactured using a tight annealing furnace without using a continuous annealing furnace or an oven coil annealing furnace. In this case, the ultra-low carbon steel strip is
It has a higher recrystallization temperature and higher transformation temperature than ordinary cold rolled steel strip. For this reason, it is necessary to anneal the coil at a temperature higher than the optimum annealing temperature of 620-700°C for normal cold-rolled steel strips.
の焼付き疵の発生や雰囲気ガス中の窒素の吸窒等の問題
が生じる。Problems such as the occurrence of seizure defects and the adsorption of nitrogen in the atmospheric gas occur.
一般的なベル型タイト焼鈍炉は、第３図に示すとおり、
焼鈍する鋼帯コイル（１）にインナーカバー（２）をか
ぶせたのち加熱ベル（３）をかぶせ、インナーカバー（
２）内に還元性ガスを吹込んで空気を追出し、その外側
からバーナー（４）あるいは電気加熱によりコイル（１
）を加熱する。A typical bell-shaped tight annealing furnace is shown in Figure 3.
After covering the steel strip coil (1) to be annealed with the inner cover (2), the heating bell (3) is placed over the inner cover (
2) Reducing gas is blown into the interior to expel air, and the coil (1) is heated from the outside using a burner (4) or electric heating.
).
還元性ガスとして従来から多く使用されるものは、光輝
度の要求から酸化成分、炭化成分が少ないこと、および
製造方法が容易で安価なことから、アンモニア分解ガス
に窒素を混合し、あるいはプロパンガスなどに窒素を混
合し、水素６〜２０％、残部窒素からなる還元性ガスで
ある。Reducing gases that have traditionally been widely used are ammonia decomposition gas mixed with nitrogen, or propane gas, which is low in oxidizing and carbonizing components due to brightness requirements, and is easy and inexpensive to produce. It is a reducing gas consisting of 6 to 20% hydrogen and the balance nitrogen.
加熱処理終了後、加熱ベル（３）を取除き、冷却ベル（
５）に取替え、冷却したのち、調質圧延等に供している
。After the heating process is completed, remove the heating bell (3) and replace the cooling bell (
5), and after cooling, it is subjected to temper rolling, etc.
なお、（６）はインナーカバー（２）内封流ファン、（
７）は対流ファン（６）のモーターである。In addition, (6) is the inner cover (2) internal flow fan, (
7) is the motor of the convection fan (6).
このベル型タイト焼鈍炉でのバーナーからコイルへの熱
伝達は、インナーカバー（２）および還元性雰囲気ガス
を介して行なわれる。Heat transfer from the burner to the coil in this bell-shaped tight annealing furnace is performed via the inner cover (2) and the reducing atmosphere gas.
このため、コイル（１）の外周部と内周部では、インナ
ーカバー（２）からの距離に差が生じ、輻射熱の影響が
異なるため、半径方向で温度差が生じる。このコイル（
１）の外周部と内周部の温度差は、外周部が内周部より
１０〜２０℃高くなり、コイル外周部がオーバーヒート
気味になり、焼付き疵が発生し易くなる。For this reason, there is a difference in the distance from the inner cover (2) between the outer circumferential portion and the inner circumferential portion of the coil (1), and the effects of radiant heat are different, resulting in a temperature difference in the radial direction. This coil (
Regarding the temperature difference between the outer peripheral part and the inner peripheral part in 1), the outer peripheral part is 10 to 20 degrees Celsius higher than the inner peripheral part, and the outer peripheral part of the coil tends to be overheated, making it easy to cause seizure defects.
また、Ｔｉを添加した極低炭素鋼帯は、Ｔ１とＮの結合
力が極めて強いため、焼鈍雰囲気中にＮ２が存在すると
、吸窒現象が生じ、機械試験値特性を劣化させる場合が
ある。Further, in the ultra-low carbon steel strip to which Ti is added, the bonding force between T1 and N is extremely strong, so if N2 is present in the annealing atmosphere, a nitrification phenomenon occurs, which may deteriorate the mechanical test value characteristics.
発明が解決しようとする課題
前記ベル型タイト焼鈍炉でのコイル外周部と内周部での
温度差の発生を防止する方法としては、コイル外径をイ
ンナーカバー内径に比較して小さくし、あるいはインナ
ーカバーを二重構造にする等によって、インナーカバー
の温度差による輻射熱の影響を緩和している。しかし、
いずれにしても焼鈍炉の能率が著しく低下する。Problems to be Solved by the Invention As a method for preventing a temperature difference between the outer circumference and the inner circumference of the coil in the bell-shaped tight annealing furnace, the outer diameter of the coil is made smaller than the inner diameter of the inner cover, or By making the inner cover have a double structure, etc., the effects of radiant heat due to temperature differences between the inner covers are alleviated. but,
In either case, the efficiency of the annealing furnace is significantly reduced.
さらに、外部加熱方式の焼鈍炉も考えられたが、外部加
熱のため設備そのものが大きくなり、また、加熱雰囲気
の吹出し口部での温度差が生じる等の問題があった。Furthermore, an annealing furnace using an external heating method has been considered, but the equipment itself becomes large due to external heating, and there are also problems such as a temperature difference occurring at the outlet of the heated atmosphere.
さらに、Ｔｉを添加した極低炭素鋼帯は、Ｔ１とＮの結
合力が極めて強いため、焼鈍雰囲気中にＮ２が存在する
と、鋼中に侵入し機械試験値特性を劣化させる加窒現象
を生じるという欠点がある。Furthermore, in ultra-low carbon steel strips containing Ti, the bonding force between T1 and N is extremely strong, so if N2 is present in the annealing atmosphere, it will penetrate into the steel and cause a nitriding phenomenon that deteriorates the mechanical test value characteristics. There is a drawback.
この発明の目的は、前記従来方式のタイト焼鈍炉におい
て、コイル外周部と内周部の温度差の発生を防止し、コ
イル外周部における過熱を防止できると共に、焼鈍効率
を向上できる極低炭素鋼帯の焼鈍方法を提供するにある
。An object of the present invention is to use an ultra-low carbon steel that can prevent a temperature difference between the outer circumference and the inner circumference of the coil, prevent overheating at the outer circumference of the coil, and improve annealing efficiency in the conventional tight annealing furnace. The present invention provides a method for annealing a strip.
課題を解決するための手段
本発明者らは、前記目的を達成すべく種々検討の結果、
ほぼ１００％濃度の水素ガス雰囲気下で焼鈍することに
よって、水素ガスの高熱伝導性により焼鈍雰囲気の熱伝
達が促進され、インナーカバーとの距離の差に基づく輻
射熱の影響が抑制されてコイルの外周部と内周部の温度
差を低減できることを見い出し、この発明に到達した。Means for Solving the Problems As a result of various studies to achieve the above object, the present inventors have found that
By annealing in a nearly 100% hydrogen gas atmosphere, the high thermal conductivity of hydrogen gas promotes heat transfer in the annealing atmosphere, suppressing the influence of radiant heat due to the difference in distance from the inner cover, and reducing the outer periphery of the coil. The inventors have discovered that it is possible to reduce the temperature difference between the outer circumferential portion and the inner peripheral portion, and have arrived at this invention.
すなわちこの発明は、タイト焼鈍炉において、炭素含有
量０．００６ｗｔ％以下の極低炭素鋼帯のコイルを、水
素濃度ほぼ１００％の水素ガス雰囲気下、焼鈍温度６８
０〜７５０℃で焼鈍するのである。That is, the present invention anneales a coil of ultra-low carbon steel strip with a carbon content of 0.006 wt% or less in a tight annealing furnace in a hydrogen gas atmosphere with a hydrogen concentration of approximately 100%.
It is annealed at 0 to 750°C.
作 用
この発明においては、タイト焼鈍炉を用い、炭素含有量
０．００６０重量％以下の極低炭素鋼帯のコイルを、水
素濃度ほぼ１００％の水素ガス雰囲気下、焼鈍温度６８
０〜７５０℃で焼鈍する。このため、インナーカバー内
の焼鈍ガス雰囲気は、水素濃度がほぼ１００％の水素雰
囲気となり、従来の水素濃度６〜２０％に比較して約５
〜１７倍となる。この水素の高熱伝導性（窒素の約７倍
）のため、インナーカバーの円周方向での温度差ならび
に半径方向での熱伝導性に基づくコイル外周部と内周部
の温度差の発生は、ほぼ１００％の水素ガス雰囲気によ
る熱伝達の促進により抑制されるのである。Function In this invention, a coil of ultra-low carbon steel strip with a carbon content of 0.0060% by weight or less is annealed at a temperature of 68% in a hydrogen gas atmosphere with a hydrogen concentration of approximately 100% using a tight annealing furnace.
Anneal at 0-750°C. Therefore, the annealing gas atmosphere inside the inner cover becomes a hydrogen atmosphere with a hydrogen concentration of almost 100%, which is about 5% compared to the conventional hydrogen concentration of 6 to 20%.
~17 times. Due to the high thermal conductivity of hydrogen (approximately 7 times that of nitrogen), the temperature difference between the outer circumference and inner circumference of the coil due to the temperature difference in the circumferential direction of the inner cover and the thermal conductivity in the radial direction is This is suppressed by the promotion of heat transfer by the nearly 100% hydrogen gas atmosphere.
なお、極低炭素鋼帯としては、普通の炭素系、Ｔｉ添加
、Ｎｂ添加、Ｔｉ、Ｎｂ複合添加の炭素鋼帯の炭素含有
量を０．００６ｗｔ％以下としたのは、０、００６ｗｔ
％を超えると、脱炭焼鈍が必要となり、タイト焼鈍炉で
は焼鈍不可能となるからである。In addition, as an ultra-low carbon steel strip, the carbon content of ordinary carbon-based, Ti-added, Nb-added, Ti, Nb composite-added carbon steel strip is 0.006 wt% or less.
%, decarburization annealing becomes necessary and annealing becomes impossible in a tight annealing furnace.
焼鈍雰囲気中の水素濃度をほぼ１００％としたのは、イ
ンナーカバー内でのより均一な熱伝導性を確保するため
である。このような水素ガスとしては、水を原料とし電
気分解して得た濃度９９．８％の未清浄水素あるいは濃
度１００％の清浄水素を使用することができる。The hydrogen concentration in the annealing atmosphere was set to approximately 100% in order to ensure more uniform thermal conductivity within the inner cover. As such hydrogen gas, unpurified hydrogen with a concentration of 99.8% obtained by electrolyzing water as a raw material or clean hydrogen with a concentration of 100% can be used.
焼鈍温度を６８０〜７５０℃としたのは、６８０℃未満
では結晶粒の成長が十分でなく、所望の機械的特性が得
られない。また７５０℃を超えると焼鈍過程の再結晶時
の異常粒成長が生じ、機械的特性が悪化するからである
。The reason why the annealing temperature is 680 to 750°C is that if it is lower than 680°C, the growth of crystal grains is insufficient and desired mechanical properties cannot be obtained. Further, if the temperature exceeds 750°C, abnormal grain growth occurs during recrystallization during the annealing process, resulting in deterioration of mechanical properties.
また、高濃度水素ガス雰囲気下で焼鈍を行うため、水素
の高熱伝導性により焼鈍効率が向上する。Furthermore, since annealing is performed in a highly concentrated hydrogen gas atmosphere, the annealing efficiency is improved due to the high thermal conductivity of hydrogen.
実 施 例
実施例１
第１表に示す組成からなる極低炭素鋼片を１２００℃に
加熱したのち粗圧延し、次いで仕上圧延開始温度９００
℃、巻取り温度６３０℃で仕上圧延して板厚２．３ｍｍ
に熱間圧延した。得られたコイルを冷間圧延した０、
４ｍｍの冷延鋼帯のコイルを、第３図に示すような円周
方向に４個のバーナーが３段に設けられたベル型タイト
焼鈍炉において、炉温９００℃、コイル温度７３５℃、
焼鈍時間１６時間、インナーカバー内清浄水素（水素濃
度１００％）雰囲気下で焼鈍した。そして焼鈍後のコイ
ルの半径方向の温度差を測定したところ、第１図に示す
とおりであった。焼鈍完了後のコイルは徐々に冷却した
のち伸率０．６％の調質圧延を行い、得られた超深絞り
極低炭素鋼帯からＪ ＩＳ５号引張試験片を切出し、引
張試験を行い降伏点（以下ＹＰという）、引張強度（以
下ＴＳという）および伸び（以下Ｅｌという）を測定し
、ランクフォード値（以下ｒ値という）を求めた。その
結果を第２表に示す。Examples Example 1 An ultra-low carbon steel billet having the composition shown in Table 1 was heated to 1200°C, rough rolled, and then finished rolled at a starting temperature of 900°C.
Finish rolling at a coiling temperature of 630°C to a plate thickness of 2.3mm.
Hot rolled. The obtained coil was cold rolled 0,
A coil of 4 mm cold-rolled steel strip was heated in a bell-shaped tight annealing furnace equipped with four burners in three stages in the circumferential direction as shown in Fig. 3, at a furnace temperature of 900°C, a coil temperature of 735°C,
The inner cover was annealed in an atmosphere of clean hydrogen (hydrogen concentration 100%) for 16 hours. The temperature difference in the radial direction of the coil after annealing was measured, and the results were as shown in FIG. After completion of annealing, the coil was gradually cooled and then subjected to temper rolling with an elongation rate of 0.6%. JIS No. 5 tensile test pieces were cut from the obtained ultra-deep drawn ultra-low carbon steel strip and subjected to a tensile test to determine yield. Point (hereinafter referred to as YP), tensile strength (hereinafter referred to as TS) and elongation (hereinafter referred to as El) were measured, and the Lankford value (hereinafter referred to as r value) was determined. The results are shown in Table 2.
同様に従来法としてインナーカバー内を水素１１％、窒
素８９％の雰囲気とした以外は、前記と同一条件で焼鈍
を行った。そして焼鈍後のコイルの半径方向の温度を測
定すると共に、徐々に冷却したのち同じ伸率で調質圧延
を行い、同様に引張試験を実施した。その結果を第２図
および第２表に示す。Similarly, as a conventional method, annealing was performed under the same conditions as above except that the inside of the inner cover was made into an atmosphere of 11% hydrogen and 89% nitrogen. Then, the temperature in the radial direction of the coil after annealing was measured, and after gradual cooling, skin pass rolling was performed at the same elongation rate, and a tensile test was conducted in the same manner. The results are shown in FIG. 2 and Table 2.
以下余白
第 １ 表 （ｗｔ２：）（注）単位
： Ｙ Ｐ、 Ｔ Ｓ ： ｋｇｆ／ｍｍ”、Ｅ ｌ
： ％
水素１１％と窒素８９％の混合ガスを還元性ガスとして
使用した従来法の場合は、第２図に示すとおりコイルの
半径方向の温度差が１０〜２０’Ｃである。Margin below Table 1 (wt2:) (Note) Unit: Y P, T S: kgf/mm”, E l
:% In the case of the conventional method using a mixed gas of 11% hydrogen and 89% nitrogen as the reducing gas, the temperature difference in the radial direction of the coil is 10 to 20'C, as shown in FIG.
これに対し本発明法の場合は、第１図に示すとおりコイ
ルの半径方向の温度差が５℃以下に低減している。On the other hand, in the case of the method of the present invention, as shown in FIG. 1, the temperature difference in the radial direction of the coil is reduced to 5° C. or less.
このため、本発明法の場合は、焼鈍時のコイル半径方向
の温度差が軽減され、焼鈍時のコイルの半径方向の温度
差に基づく焼付き疵の発生は見られなかった。Therefore, in the case of the method of the present invention, the temperature difference in the radial direction of the coil during annealing was reduced, and no seizure defects were observed due to the temperature difference in the radial direction of the coil during annealing.
また、第２表に示すとおり、本発明法の場合は、十分良
好な機械試験値特性を得たが、従来法の場合は、焼鈍時
の吸窒現象の影響からか機械試験値特性が劣化している
。In addition, as shown in Table 2, in the case of the method of the present invention, sufficiently good mechanical test value characteristics were obtained, but in the case of the conventional method, the mechanical test value characteristics deteriorated, probably due to the influence of the nitrification phenomenon during annealing. are doing.
発明の効果、
以上述べたとおり、この発明方法によれば、水素濃度ほ
ぼ１００％の水素ガス雰囲気中で極低炭素鋼帯をタイト
焼鈍することによって、焼鈍時のコイルの半径方向の温
度差を著しく小さくでき、高温焼鈍時のコイルの焼付き
疵の発生を防止でき、また、吸窒現象を生じることもな
く、機械試験値特性の良好な製品を得ることができる。Effects of the Invention As described above, according to the method of the present invention, by tightly annealing an ultra-low carbon steel strip in a hydrogen gas atmosphere with a hydrogen concentration of approximately 100%, the temperature difference in the radial direction of the coil during annealing can be reduced. It is possible to significantly reduce the size of the coil, prevent the occurrence of seizure defects in the coil during high-temperature annealing, and obtain a product with good mechanical test value characteristics without causing the nitrification phenomenon.
第１図は実施例１のこの発明におけるコイル半径方向の
温度分布を示す説明図、第２図は実施例１の従来法にお
けるコイル半径方向の温度分布を示す説明図、第３図は
ベル型タイト焼鈍炉の概略説明図である。
１・・・コイル、 ２・ インナーカバー、３
・・・加熱ベル、 ４・・バーナー、５・・・冷
却ベル、 ６・・・対流ファン、７・・モーター
、
出 願 人 住友金属工業株式会社Figure 1 is an explanatory diagram showing the temperature distribution in the radial direction of the coil in the present invention of Example 1, Figure 2 is an explanatory diagram showing the temperature distribution in the radial direction of the coil in the conventional method of Example 1, and Figure 3 is a bell-shaped diagram. It is a schematic explanatory view of a tight annealing furnace. 1... Coil, 2. Inner cover, 3
... Heating bell, 4. Burner, 5. Cooling bell, 6. Convection fan, 7. Motor, Applicant: Sumitomo Metal Industries, Ltd.
Claims (1)
％以下の極低炭素鋼帯のコイルを、ほぼ１００％の水素
ガス雰囲気下、焼鈍温度６８０〜７５０℃で焼鈍するこ
とを特徴とする極低炭素鋼帯の焼鈍方法。1 In a tight annealing furnace, a coil of ultra-low carbon steel strip with a carbon content of 0.006% by weight or less is annealed at an annealing temperature of 680 to 750°C in an almost 100% hydrogen gas atmosphere. Method of annealing carbon steel strip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29512890A JPH04168228A (en) | 1990-10-30 | 1990-10-30 | Method for annealing dead soft steel strip |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29512890A JPH04168228A (en) | 1990-10-30 | 1990-10-30 | Method for annealing dead soft steel strip |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04168228A true JPH04168228A (en) | 1992-06-16 |
Family
ID=17816651
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP29512890A Pending JPH04168228A (en) | 1990-10-30 | 1990-10-30 | Method for annealing dead soft steel strip |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04168228A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05117757A (en) * | 1991-10-25 | 1993-05-14 | Kobe Steel Ltd | Manufacture of cold rolled steel sheet excellent in press formability |
| JP2007092134A (en) * | 2005-09-29 | 2007-04-12 | Jfe Steel Kk | Cold-rolled steel sheet excellent in chemical conversion treatment, and manufacturing method therefor |
-
1990
- 1990-10-30 JP JP29512890A patent/JPH04168228A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05117757A (en) * | 1991-10-25 | 1993-05-14 | Kobe Steel Ltd | Manufacture of cold rolled steel sheet excellent in press formability |
| JP2007092134A (en) * | 2005-09-29 | 2007-04-12 | Jfe Steel Kk | Cold-rolled steel sheet excellent in chemical conversion treatment, and manufacturing method therefor |
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