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October 19, 2005

鉄と鉄鋼がわかる本

tetsutotekkou
 【今週の一冊】
 ●『鉄と鉄鋼がわかる本』

  編著:新日本製鉄(株)(日本実業出版社)
   2004.11 / ¥1,890

-----------------------------------
 ◆ 燃える一言 ◆

 『世界の最先端を行く日本の鉄鋼製造技術は、宇宙からの贈り物である鉄を、
       いかに私たちの生活の進歩に役立つようにしていくかという、
                  いわば「現代の錬金術」でしょう。』

-----------------------------------
 私たちに日常生活において、そして「ものづくり」の現場において、切って
 も切り離せない材料といえば、何といっても「鉄」でしょう。
 
 いや、鉄こそが「切っても切り離せる」金属なのです。
 
 ・・冒頭から訳の分からんことを書きましたが、「溶断」で「切り離せる」
 身近な金属は、実は鉄しかないのです。
 
 他の金属の酸化物は、元の金属よりも溶融温度が高くなってしまいますが、
 酸化鉄は溶融温度が鉄よりも下がるという、稀有な特徴があるため、ガス溶
 断ができ、高い生産性を持っているのです。
 
 
 このように、あまりに身近でありながら、多彩な特徴をもつ「鉄」の魅力を、
 余すところなく伝えているのが本書です。
 
 
 まず、鉄を生み出すシンボル的存在が「高炉(溶鉱炉)」です。
 
 酸化鉄として存在する「鉄鉱石」を、コークスと共に加熱し、還元すること
 で「溶銑」と呼ばれる鉄を取り出します。
 
 一見、ただの円筒に見える「高炉」ですが、鉄鉱石とコークスを同心円状に
 適切な比率で投入したり、Fe2O3→Fe3O4→FeO→Feへと徐々に還元するために
 シミュレーションと温度計測により制御する技術は、複雑極まります。
 
 
 こうしてできた「溶銑」は、炭素含有量が高く、また燐や硫黄などの不純物
 を含むため、次に「転炉」が活躍します。
 
 「溶銑」を転炉に注ぎ込む様子は、製鉄所の印象的なシーンですが、転炉で
 は上部から高圧で酸素を吹き込むことで発熱させ、炭素を酸化し、また不純
 物をスラグ化して取り除いて、低炭素で不純物の少ない鋼が精錬されるので
 す。
 
 製鉄の基本となる工程はこれだけなのですが、要求される高機能な鉄鋼材料
 を生み出すために、製鉄技術は今もなお、進歩しています。
 
 
 次に、ユーザーが使いやすい形の「鉄鋼製品」として加工せねばなりません
 が、板やレール、パイプなど馴染み深いものはほとんど「圧延」で作られて
 います。
 
 板を加工するのは、ちょうど麺棒でうどん粉を薄く延ばすのと似ていますが、
 似ても似つかないのが「硬さ」です。
 
 
 鉄の場合、圧延ロールに幅1mmあたり2トン近くの荷重がかかるため、ロ
 ールが曲がり、板の中央付近が端よりも厚くなる「クラウン」と呼ばれる現
 象が起きます。
 
 それを抑えようと中央部の圧力を強くすると、真ん中だけ延びて波打ってし
 まいますし、ハイテンなどの硬い材料の場合はロールの曲がりにより端だけ
 伸びて、やはり波打ってしまいます。
 
 出口では時速100kmにもなる高速ラインで、鋼の温度や硬さから圧延荷重、ロ
 ール隙間、回転数を制御し、クラウン等の形状を制御するのは、これまた至
 難の技です。
 
 
 地球で最も量が多い元素で、飛び抜けて可採埋蔵量も多い鉄。
 
 生物の体内でも、酸素を運ぶ血液中のヘモグロビンとして活躍する鉄分。
 
 まるで花が咲くように美しい結晶が、その姿を変えながら、我々の生活を力
 強く支えてくれていることを、イラストや写真を交えて、実に分かりやすく
 学ぶことができる一冊です。
 ----------------------------------
 ◇ カンドコロ! ◇
 
 鉄の弱点、といえば「錆」。
 
 防錆の代表が「めっき」であり、中でも「亜鉛めっき」が代表だ。
 
 「亜鉛めっき」では、皮膜に少々の欠陥があっても、防錆効果がある。
 
 それは、鉄よりも亜鉛のほうがイオン化傾向が大きいため、水分に鉄イオン
 が溶ける前に、亜鉛が優先して溶け出すからだ。
 
 これを「犠牲防食型皮膜」という。

───────────────────────────────────
 ◆ 熱い行動 ◆
 鉄と炭素の状態図と、結晶の写真を関連づけて眺めてみよう。
 
 ものづくりの基本は、「育ちより氏」。
 後工程でいじり回す前に、材料を徹底的に調査しよう。
-----------------------------------
 ◆ 燃えるゲージ ◆ | 炎 | 炎 | 火 | (炎3つが満点)
-----------------------------------
 第1章:鉄の生い立ちと、鉄鋼製品ができるまで
 第2章:鉄鉱石から鉄を生み出す
 第3章:鋼を生み出す
 第4章:形を造り込む
 第5章:鉄と鉄をつなぐ
 第6章:やわらかくて強い、そしてさびない鉄を!
 第7章:鉄に願いを

|

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Comments

 なんか最近、日立金属さんがHPM-MAGICとかいうプラスチック用金型材料の販売を開始したらしいですね。これらの分類の中でHPM-MAGICはどこの位置付けになるのでしょうか。

Posted by: 東海林 | April 27, 2008 at 08:48 AM

 残念ながら、そういった材料にはめぐり合えません。構造用鋼では、感動ではなく安心が売りだからです。性能をもとめる特殊鋼は感動ものですが、規格化大量生産主義者が跋扈している昨今、かなりの専門性があるところでしか理解されていない。鉄鋼材料の研究開発の谷は、むしろ世間を知らない鉄鋼開発者と現状を変えたくない鉄鋼流通業者のなかで、密やかに作り出されているのです。

Posted by: アムロ | August 19, 2008 at 11:42 PM

 そうですよね。業界に覇権を作り出そうとしたM商事、だけど具体的な地球温暖化の技術開発はメーカーしか出来ない。流通は評論家で物知りぶっているが、どんなに言説を弄しても技術を作ることが出来ない点ではインプット/アウトプット制御型のブラックボックス無関心主義者なのです。そういう人々が地球環境配慮へ否定的な書物を多数出版しています。お前は人間か?と怒りたくなります。
 

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