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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク History of the steel industry (1970–present) ： ウィキペディア英語版 History of the steel industry (1970–present) The global steel industry has been going through major changes since 1970. China has emerged as a major producer and consumer, as has India to a lesser extent. Consolidation has been rapid in Europe. ==Material for development== The volume of steel consumed has been the barometer for measuring development and economic progress. Whether it is construction or industrial goods, steel is the basic raw material. Lighter metals and stronger alloys have been developed. Plastics and synthetics have replaced steel in many areas. Steel is made from ores still found in abundance around the world. Technological developments have brought down the time for transformation from iron ore to steel to within a day. Even after decades of use, it can be sent back to the furnaces as scrap, melted and remade into new qualities of steel. It is the most recycled material in the world. In developed countries, recycling accounts for almost half of the steel produced. Another major feature is the continuous improvement of steel grades. Half of today's steel grades were not available ten years ago. Just take the example of the most commonly used steel – rods or bars, used as reinforcement material with cement concrete. It used to be plain bars even in the sixties, then came the ribbed bars, followed by the cold twisted deformed bars and now it is thermo mechanically treated bars. Each development has added to the strength of construction. Older varieties of steel have been improved upon and newer grades introduced. The process continues. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「History of the steel industry (1970–present)」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.