JPH0730389B2 - Annealing method - Google Patents
Annealing methodInfo
- Publication number
- JPH0730389B2 JPH0730389B2 JP61193072A JP19307286A JPH0730389B2 JP H0730389 B2 JPH0730389 B2 JP H0730389B2 JP 61193072 A JP61193072 A JP 61193072A JP 19307286 A JP19307286 A JP 19307286A JP H0730389 B2 JPH0730389 B2 JP H0730389B2
- Authority
- JP
- Japan
- Prior art keywords
- steel material
- furnace
- treated steel
- less
- dew point
- 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 - Lifetime
Links
- 238000000137 annealing Methods 0.000 title claims description 24
- 238000000034 method Methods 0.000 title claims description 9
- 229910000831 Steel Inorganic materials 0.000 claims description 61
- 239000010959 steel Substances 0.000 claims description 61
- 239000000463 material Substances 0.000 claims description 46
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims description 22
- 238000005554 pickling Methods 0.000 claims description 13
- 238000001816 cooling Methods 0.000 claims description 11
- 238000010438 heat treatment Methods 0.000 claims description 10
- 238000002791 soaking Methods 0.000 claims description 7
- 238000005096 rolling process Methods 0.000 claims description 4
- 238000005491 wire drawing Methods 0.000 claims description 4
- 239000007789 gas Substances 0.000 description 24
- 239000000203 mixture Substances 0.000 description 5
- 239000002436 steel type Substances 0.000 description 5
- 238000005261 decarburization Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000010583 slow cooling Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 238000005255 carburizing Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 230000007935 neutral effect Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000006722 reduction reaction Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Landscapes
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は鋼材をその機械的性質を改善する目的で焼なま
しする方法に関するものである。特に、焼なまし後の酸
洗工程を改善する焼なまし方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method of annealing a steel material for the purpose of improving its mechanical properties. In particular, it relates to an annealing method for improving the pickling step after annealing.
鋼の機械的性質を改善するために行なわれる球状化焼な
ましは一般に処理鋼材をAc1変態点付近の温度に加熱・
均熱した後、徐冷することにより鋼中の炭素を球状化せ
しめるものであるが、その加熱による鋼材表面が酸化或
いは還元、および、脱炭或いは浸炭するのを防ぐため従
来から炉内雰囲気ガスをその処理鋼材に対して中性でし
かも無脱炭無浸炭性ガスに成分調整する必要はあった。
即ち従来から焼なまし時の雰囲気ガスにはH2,CO等の還
元性ガスとN2ガスとの混合ガス（吸熱形ガス）が使用さ
れているが、その混合ガスが酸化性か中性か或いは還元
性かはその処理鋼材の鋼種によって異なり特に中性を保
つにはその成分コントロールがその鋼種に合わせて非常
に厳格に行なわなければならず不適切な調整はすぐに品
質を損うこととなるので大変に神経を使うところであり
不良品も生じ易い状況であった。また、その混合ガスが
浸炭性か脱炭性かについても同様にその処理鋼材によっ
て決るのでその成分調整についても非常に難しく熟練を
要するものであった。従って鋼種を変更した場合に新た
にその鋼種にあわせた成分コントロールが必要であっ
た。しかも、これらの雰囲気ガスは大気が混合すると爆
発するので危険でもあった。さらに、焼なまし後の酸洗
工程の改善が望まれていた。Spheroidizing annealing, which is performed to improve the mechanical properties of steel, generally involves heating the treated steel to a temperature near the Ac 1 transformation point.
After soaking, the carbon in the steel is spheroidized by slow cooling.However, in order to prevent the steel surface from being oxidized or reduced, and decarburized or carburized by heating, the atmospheric gas in the furnace has been conventionally used. It was necessary to adjust the composition of the treated steel to be neutral and decarburization-free carburizing gas.
That is, conventionally, a mixed gas (endothermic gas) of a reducing gas such as H 2 or CO and an N 2 gas has been used as an atmosphere gas at the time of annealing, but the mixed gas is oxidative or neutral. Whether it is reducing or reducing depends on the steel type of the treated steel, and in order to maintain neutrality, the composition control must be performed very strictly according to the steel type, and improper adjustment will immediately deteriorate quality. Therefore, it was very nervous and defective products were likely to occur. Further, whether the mixed gas is carburizing or decarburizing is also determined depending on the treated steel material, so that it is very difficult to adjust the composition and requires skill. Therefore, when the steel type was changed, it was necessary to newly control the composition according to the steel type. Moreover, these atmospheric gases are dangerous because they explode when the atmosphere is mixed. Furthermore, improvement of the pickling process after annealing has been desired.
本発明は上記問題を解消しようとするもので、その第１
の発明は、酸洗処理あるいは線引加工が施され表面に厚
さ３μｍ以下の酸化鉄スケールが形成された処理鋼材を
炉内に装入し、該炉内に高純度のN2ガスを充満させ露点
を−35℃以下に保って該炉内を気密に密閉し、該処理鋼
材をO2分圧比が10-14atm以下の条件にて700〜800℃の焼
鈍温度に加熱・均熱した後、該処理鋼材をその密閉状態
のままで600〜650℃に徐冷することを特徴とする。The present invention is intended to solve the above problems, and firstly,
Of the present invention, a treated steel material having an iron oxide scale with a thickness of 3 μm or less formed on the surface by pickling or drawing is charged into the furnace, and the furnace is filled with high-purity N 2 gas. Then, the inside of the furnace was hermetically sealed while keeping the dew point at −35 ° C. or lower, and the treated steel material was heated and soaked at an annealing temperature of 700 to 800 ° C. under the condition that the O 2 partial pressure ratio was 10 −14 atm or less. After that, the treated steel material is gradually cooled to 600 to 650 ° C. in the hermetically sealed state.
また、第２の発明は、酸洗処理あるいは線引加工が施さ
れ表面に厚さ３μｍ以下の酸化鉄スケールが形成された
処理鋼材を炉内に装入し、該炉内に高純度のN2ガスを充
満させ露点を−35℃以下に保って該炉内を気密に密閉
し、該処理鋼材をO2分圧比が10-14atm以下の条件にて70
0〜800℃の焼鈍温度に加熱・均熱した後、該処理鋼材を
その密閉状態のままで600〜650℃に徐冷し、該処理鋼材
をO2濃度が10ppm以下で露点が10℃以下のN2ガス雰囲気
を充満させた冷却室に移して150℃以下に冷却するよう
にしたことを特徴とする。The second invention is that a treated steel material having an iron oxide scale with a thickness of 3 μm or less formed on the surface by pickling or drawing is charged into the furnace, and the high-purity N is charged in the furnace. 2 The gas is filled and the dew point is kept at -35 ° C or lower to hermetically seal the inside of the furnace, and the treated steel material is O 2 at a partial pressure ratio of 10 -14 atm or less.
After heating and soaking to an annealing temperature of 0 to 800 ° C., the treated steel material is gradually cooled to 600 to 650 ° C. in the closed state, and the treated steel material has an O 2 concentration of 10 ppm or less and a dew point of 10 ° C. or less. It is characterized in that it is moved to a cooling chamber filled with N 2 gas atmosphere and cooled to 150 ° C. or lower.
また、第３の発明は、表面に10μｍ以上の厚さの酸化鉄
スケールが形成された圧延肌の処理鋼材を炉内に装入
し、該炉内に高純度のN2ガスを充満させ露点を−18℃以
下に保って該炉内を気密に密閉し、該処理鋼材をO2分圧
比が10-12atm以下の条件にて700〜800℃の焼鈍温度に加
熱・均熱した後、該処理鋼材をその密閉状態のままで60
0〜650℃に徐冷することを特徴とする。A third aspect of the present invention is to charge a rolled surface treated steel material having an iron oxide scale with a thickness of 10 μm or more on the surface into a furnace, and fill the furnace with high-purity N 2 gas to form a dew point. Is kept at -18 ° C or lower to hermetically seal the inside of the furnace, and the treated steel material is heated and soaked to an annealing temperature of 700 to 800 ° C under an O 2 partial pressure ratio of 10 -12 atm or less, The treated steel is left in its sealed state 60
It is characterized by slow cooling to 0 to 650 ° C.
さらに、第４の発明は、表面に10μｍ以上の厚さの酸化
鉄スケールが形成された圧延肌の処理鋼材を炉内に装入
し、該炉内に高純度のN2ガスを充満させ露点を−18℃以
下に保って該炉内を気密に密閉し、該処理鋼材をO2分圧
比が10-12atm以下の条件にて700〜800℃の焼鈍温度に加
熱・均熱した後、該処理鋼材をその密閉状態のままで60
0〜650℃に徐冷し、その後該処理鋼材を大気中にて強制
冷却するようにしたことを特徴とする。Further, a fourth invention is to introduce into the furnace a treated steel material for rolling skin having an iron oxide scale with a thickness of 10 μm or more formed on the surface thereof, and to fill the furnace with high-purity N 2 gas to form a dew point. Is kept at -18 ° C or lower to hermetically seal the inside of the furnace, and the treated steel material is heated and soaked to an annealing temperature of 700 to 800 ° C under an O 2 partial pressure ratio of 10 -12 atm or less, The treated steel is left in its sealed state 60
It is characterized in that it is gradually cooled to 0 to 650 ° C. and then the treated steel material is forcibly cooled in the atmosphere.
炉内を低露点で高純度のN2ガス雰囲気に保つことによっ
て、鋼材を酸化，還元および脱浸炭を起こすことなく焼
なましできるようにすると共に、酸化鉄の脱スケース性
を容易にする。By maintaining a high-purity N 2 gas atmosphere with a low dew point in the furnace, it is possible to anneal steel materials without causing oxidation, reduction, and decarburization, and to facilitate the desquatting of iron oxide.
第１の発明は、酸洗或いは線引することによって表面に
ほとんどスケールのない状態（スケール厚さが３μｍ以
下）の処理鋼材について焼なましを行うもので、該処理
鋼材を気密性の高いバッチ式炉に装入して密閉する。そ
して該炉内に市販品の露点が−50℃以下の高純度（O2濃
度１〜2ppm）のN2ガスまたは液体窒素をガス化して供給
することにより該炉内に高純度のN2ガスを充満させる。
そして炉内の電熱ヒータまたはラジアントチューブの加
熱により炉内温度を徐々に上昇させ鋼材を700〜800℃の
焼鈍温度にて均熱させる。そのときN2ガス中に残留して
いる微量のO2は炉壁や鋼材トレイ等によって吸収される
ことからO2濃度は加熱により自然と下がってO2分圧比10
-12atm以下になる。その後該鋼材はその炉内で密閉状態
のままで650℃に徐冷し、空気中に取り出す。なお、上
記処理鋼材は露点が−35℃以下にてトータル脱炭深さが
約0.15mm（JIS規格の約半分の値）になり、露点が−35
℃以下でないと脱炭による不具合（表面にアンコ状にス
ケールができる。）が生じる。本発明ではこのようにス
ケールのない状態で熱処理できることで後酸洗も容易に
なる。The first invention is to perform annealing on a treated steel material having almost no scale on the surface (scale thickness of 3 μm or less) by pickling or drawing, and treating the treated steel material in a highly airtight batch. Insert in a furnace and seal tightly. And the dew point of a commercially available product in the furnace is -50 ° C. or less high purity (O 2 concentration 1-2 ppm) N 2 gas or high-purity N 2 gas in the furnace by gasifying and supplying liquid nitrogen. Fill up.
Then, the temperature inside the furnace is gradually raised by heating an electric heater or a radiant tube in the furnace so that the steel material is soaked at an annealing temperature of 700 to 800 ° C. At that time, the trace amount of O 2 remaining in the N 2 gas is absorbed by the furnace wall, steel tray, etc., so the O 2 concentration naturally decreases by heating, and the O 2 partial pressure ratio of 10
-12 atm or less. After that, the steel material is gradually cooled to 650 ° C. in the furnace in a hermetically sealed state and taken out into the air. In addition, the above treated steel has a total decarburization depth of about 0.15 mm (about half the value of JIS standard) at a dew point of -35 ° C or less, and a dew point of -35 ° C.
If the temperature is not lower than ℃, problems due to decarburization (anchored scales will be formed on the surface) will occur. In the present invention, since the heat treatment can be carried out in a scale-free state as described above, post pickling can be facilitated.
また、第２の発明は、上記処理鋼材を同じく酸洗或いは
線引により表面にほとんどスケールがない処理鋼材を第
１の発明と同様O2分圧比10-12atm以下の高純度N2ガス雰
囲気中で700〜800℃に加熱・均熱した後、同炉内で650
℃に徐冷し、その後該処理鋼材を第１発明のように空気
中に取り出すことなくO2濃度10ppm以下、露点10℃以下
のN2ガス雰囲気を充満させた冷却室に移し、該冷却室に
て150℃以下に冷却してから空気中に取り出すものであ
る。なおこの冷却室のO2濃度は10ppm以下で、露点は10
℃以下に保たれていないと酸化スケールの厚さが２μｍ
以上となり表面が変色する。従ってこの冷却室の雰囲気
条件は上記値が保たれなければならない。この場合処理
鋼材をスケールのない状態で熱処理させ無酸化冷却する
ので、後酸洗が省略できるだけでなく線引品の場合には
後酸洗の省略と共にスキンパスが省略できるなど所要工
程数を大幅に減らすことができる。A second aspect of the present invention is the same as the first aspect of the present invention, in which the treated steel material is treated with pickling or wire drawing and has almost no scale on the surface, and a high purity N 2 gas atmosphere with an O 2 partial pressure ratio of 10 -12 atm or less is used. After heating and soaking at 700-800 ℃ in the furnace, 650 in the same furnace
Then, the treated steel material is transferred to a cooling chamber filled with an N 2 gas atmosphere having an O 2 concentration of 10 ppm or less and a dew point of 10 ° C. or less without being taken out into the air as in the first invention. It is taken out into the air after being cooled to 150 ° C or less. The O 2 concentration in this cooling chamber was 10 ppm or less, and the dew point was 10
If the temperature is not kept below ℃, the thickness of oxide scale is 2μm
As described above, the surface is discolored. Therefore, the atmospheric conditions of this cooling chamber must be kept at the above values. In this case, the treated steel is heat-treated in a scale-free state and non-oxidatively cooled, so that not only can post-pickling be omitted, but in the case of a wire drawing product, the post-pickling can be omitted and a skin pass can be omitted. Can be reduced.
また、第３の発明は表面に例えば10〜15μｍの比較的厚
い酸化鉄スケールが形成された圧延肌の処理鋼材を焼な
まししようとするもので、この処理鋼材を上記第１の発
明と同様の炉内に装入し該炉内をO2分圧比10-12atm以
下、露点−18℃以下なるようにして該処理鋼材を同じく
700〜800℃に加熱・均熱し同炉内で650℃に徐冷した後
大気中に取り出す。このときは露点−18℃以下にてトー
タル脱炭深さが0.15mm以下になり第１及び第２の発明に
比較すると、このように当初からスケールが形成されて
いる処理鋼材の場合はその処理条件を露点，O2分圧比と
もに大幅に緩やかにできるので処理コストが軽減でき
る。The third invention is intended to anneal a treated steel material with a rolling surface having a relatively thick iron oxide scale of, for example, 10 to 15 μm formed on its surface. This treated steel material is the same as the first invention. Of the treated steel material in such a manner that the O 2 partial pressure ratio in the furnace is 10 −12 atm or less and the dew point is −18 ° C. or less.
It is heated to 700-800 ℃, soaked, gradually cooled to 650 ℃ in the same furnace, and then taken out into the atmosphere. At this time, the total decarburization depth becomes 0.15 mm or less at a dew point of -18 ° C or less, and in comparison with the first and second inventions, in the case of the treated steel material in which the scale is formed from the beginning as described above, the treatment is performed. Both dew point and O 2 partial pressure ratio can be greatly relaxed, so processing costs can be reduced.
第４の発明は第３の発明と同じく表面に10〜15μｍの厚
い酸化鉄スケールが形成された圧延肌の処理鋼材を焼き
なまししようとするもので、該処理鋼材を第３の発明と
同じくO2分圧比10-12atm以下、露点−18℃以下にて700
〜800℃に加熱・均熱し、該処理鋼材を同炉内で600℃に
徐冷した後、該処理鋼材を５℃/minの冷却速度で大気中
にて強制冷却する。この急冷によって鋼材表面のスケー
ルにクラックが発生し酸液の浸透が良くなることで酸洗
効果が向上する。なお、大気中での冷却速度が上記のよ
うに５℃/minよりも遅い場合には充分なクラックが発生
しないので脱スケール性悪くなるおそれがある。このた
め冷却速度は５℃/min以上が望ましい。A fourth invention is intended to annealing processing steel of the third aspect of the present invention and also rolling skin thick iron oxide scales 10~15μm is formed on the surface, like O 2 and the processing steel third invention 700 at a partial pressure ratio of 10 -12 atm or less and a dew point of -18 ° C or less
After heating and soaking to ~ 800 ° C and gradually cooling the treated steel material to 600 ° C in the same furnace, the treated steel material is forcibly cooled in the atmosphere at a cooling rate of 5 ° C / min. This rapid cooling causes cracks on the scale on the surface of the steel material to improve the penetration of the acid solution, thereby improving the pickling effect. When the cooling rate in the atmosphere is slower than 5 ° C./min as described above, sufficient cracks do not occur, which may deteriorate the descaling property. Therefore, it is desirable that the cooling rate be 5 ° C / min or more.
このように本発明の焼なまし方法は、気密性の高い炉内
に処理鋼材を密閉状に装入し低露点、高純度のN2ガス雰
囲気中にて加熱・均熱および徐冷をするものであるの
で、従来の混合ガスを使用するのと異なり鋼種による成
分調整を必要としないので操業が容易になり、品質を向
上できると共に、ガス爆発のおそれも解消されるなど顕
著な効果がある。また、焼なまし後の酸洗工程を改善す
るという効果がある。As described above, the annealing method of the present invention is to hermetically charge the treated steel material in a highly airtight furnace, and perform heating, soaking and slow cooling in a N 2 gas atmosphere of low dew point and high purity. Since it does not require composition adjustment by steel type unlike conventional mixed gas, it has a remarkable effect such as easy operation, quality improvement and elimination of gas explosion. . Further, it has an effect of improving the pickling process after annealing.
Claims (4)
厚さ３μｍ以下の酸化鉄スケールが形成された処理鋼材
を炉内に装入し、該炉内に高純度のN2ガスを充満させ露
点を−35℃以下に保って該炉内を気密に密閉し、該処理
鋼材をO2分圧比が10-14atm以下の条件にて700〜800℃の
焼鈍温度に加熱・均熱した後、該処理鋼材をその密閉状
態のままで600〜650℃に徐冷することを特徴とする鋼材
の焼なまし方法。1. A treated steel material having an iron oxide scale of 3 μm or less in thickness, which has been subjected to pickling treatment or wire drawing, is charged into a furnace, and high purity N 2 gas is charged into the furnace. The furnace is air-tightly filled with the dew point kept at −35 ° C. or lower, and the treated steel material is heated / annealed to an annealing temperature of 700 to 800 ° C. under an O 2 partial pressure ratio of 10 −14 atm or less. After that, the treated steel material is gradually cooled to 600 to 650 ° C. in the hermetically sealed state, and the steel material is annealed.
厚さ３μｍ以下の酸化鉄スケールが形成された処理鋼材
を炉内に装入し、該炉内に高純度のN2ガスを充満させ露
点を−35℃以下に保って該炉内を気密に密閉し、該処理
鋼材をO2分圧比が10-14atm以下の条件にて700〜800℃の
焼鈍温度に加熱・均熱した後、該処理鋼材をその密閉状
態のままで600〜650℃に徐冷し、該処理鋼材をO2濃度が
10ppm以下で露点が10℃以下のN2ガス雰囲気を充満させ
た冷却室に移して150℃以下に冷却するようにしたこと
を特徴とする鋼材の焼なまし方法。2. A treated steel material having an iron oxide scale with a thickness of 3 μm or less formed on the surface by pickling or wire drawing is charged into a furnace, and high purity N 2 gas is charged into the furnace. The furnace is air-tightly filled with the dew point kept at −35 ° C. or lower, and the treated steel material is heated / annealed to an annealing temperature of 700 to 800 ° C. under an O 2 partial pressure ratio of 10 −14 atm or less. After that, the treated steel material is gradually cooled to 600 to 650 ° C. in the sealed state, and the treated steel material has an O 2 concentration of
A method for annealing steel material, comprising transferring to a cooling chamber filled with an N 2 gas atmosphere having a dew point of 10 ° C. or less and a dew point of 10 ° C. or less and cooling the steel material to 150 ° C. or less.
が形成された圧延肌の処理鋼材を炉内に装入し、該炉内
に高純度のN2ガスを充満させ露点を−18℃以下に保って
該炉内を気密に密閉し、該処理鋼材をO2分圧比が10-12a
tm以下の条件にて700〜800℃の焼鈍温度に加熱・均熱し
た後、該処理鋼材をその密閉状態のままで600〜650℃に
徐冷することを特徴とする鋼材の焼なまし方法。3. A treated steel material having a rolling surface having an iron oxide scale with a thickness of 10 μm or more formed on its surface is charged into a furnace, and the furnace is filled with high-purity N 2 gas to have a dew point of −18. The furnace is hermetically sealed at a temperature of not higher than 0 ° C., and the treated steel material has an O 2 partial pressure ratio of 10 −12 a.
After annealing and soaking at an annealing temperature of 700 to 800 ° C. under the condition of tm or less, the treated steel material is gradually cooled to 600 to 650 ° C. in the hermetically sealed state, and a method of annealing steel material. .
が形成された圧延肌の処理鋼材を炉内に装入し、該炉内
に高純度のN2ガスを充満させ露点を−18℃以下に保って
該炉内を気密に密閉し、該処理鋼材をO2分圧比が10-12a
tm以下の条件にて700〜800℃の焼鈍温度に加熱・均熱し
た後、該処理鋼材をその密閉状態のままで600〜650℃に
徐冷し、その後該処理鋼材を大気中にて強制冷却するよ
うにしたことを特徴とする鋼材の焼なまし方法。4. A treated steel material having a rolled surface having an iron oxide scale with a thickness of 10 μm or more formed on its surface is charged into a furnace, and the furnace is filled with high-purity N 2 gas to have a dew point of −18. The furnace is hermetically sealed at a temperature of not higher than 0 ° C., and the treated steel material has an O 2 partial pressure ratio of 10 −12 a.
After heating and soaking to an annealing temperature of 700 to 800 ° C under the conditions of tm or less, the treated steel is gradually cooled to 600 to 650 ° C in its sealed state, and then the treated steel is forced in the atmosphere. A method for annealing a steel material, characterized in that it is cooled.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61193072A JPH0730389B2 (en) | 1986-08-19 | 1986-08-19 | Annealing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61193072A JPH0730389B2 (en) | 1986-08-19 | 1986-08-19 | Annealing method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6350416A JPS6350416A (en) | 1988-03-03 |
| JPH0730389B2 true JPH0730389B2 (en) | 1995-04-05 |
Family
ID=16301737
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61193072A Expired - Lifetime JPH0730389B2 (en) | 1986-08-19 | 1986-08-19 | Annealing method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0730389B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103014261B (en) * | 2012-11-27 | 2015-04-08 | 大连经济技术开发区圣洁真空技术开发有限公司 | Link plate balling and annealing technology |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS52156707A (en) * | 1976-06-23 | 1977-12-27 | Kobe Steel Ltd | Atmospheric gas controlling in continuous annealing furnace |
| US4334938A (en) * | 1980-08-22 | 1982-06-15 | Air Products And Chemicals, Inc. | Inhibited annealing of ferrous metals containing chromium |
-
1986
- 1986-08-19 JP JP61193072A patent/JPH0730389B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6350416A (en) | 1988-03-03 |
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