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■■■■■■■■■■■■■■■■■■■ 川崎製鉄技報 KAWASAKI STEEL GIHO Vol. 32(2000) No.3 ■■■■■■■■■■■■■■■■■■■ |
| 地球環境にやさしい棒鋼・線材 Environmentally Friendly Bars and Wire Rod Steels 今村 晴幸(Haruyuki Imamura) 天野 虔一(Keniti Amano) 笹田 幹雄(Mikio Sasada) |
| 要旨 : 棒鋼・線材として供給される特殊鋼は，複雑な 2 次加工プロセスを経て最終製品となる。このため，環境負荷低減のためには，鋼材製造工程のみでなく，2 次加工，最終製品の利用および廃棄までを考慮した鋼材の開発が必要である。このような観点から開発された代表的な製品は，(1) 900 MPa 級高強度高靭性非調質鋼，(2) 800 MPa 級 TPCP 型高強度高靭性非調質鋼，(3) 軟化焼なまし，伸線工程省略鋼，(4) 機械構造用黒鉛鋼である。 |
| Synopsis : A complicated secondary machining process is usually applied to a steel for machine components, which is supplied in the form of either bar or wire rod. From the environmental point of view, steel makers should develop the steel according to a philosophy such as that of considering not only the simplification of manufacturing processes of bars and wire rods at the steel makers but also the simplification in the final use and disposal at the end users. Kawasaki Steel has developed many environmentally friendly steels based on the above-mentioned philosophy, and the typical products include (1) an as rolled 900 MPa class high tensile strength steel manufactured without a quenching and tempering process, (2) an 800 MPa class TPCP type steel with high tensile strength and excellent toughness also manufactured without a quenching and tempering process, (3) a steel manufactured without softening and drawing processes, and (4) a cold forgeable graphitized steel with excellent free cutting properties without a Pb addition. |
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