introduction metals form about a quarter of the earth crust by weight one of the earliest material used dated back to pre historic time some of the earliest metals used ...
Filetype Power Point PPT | Posted on 09 Sep 2022 | 2 years ago
The words contained in this file might help you see if this file matches what you are looking for:
...Introduction metals form about a quarter of the earth crust by weight one earliest material used dated back to pre historic time some include copper bronze and iron stone age discovery steel industrial revolution in th century all except gold are generally found chemically combined with other elements oxides sulphates commonly known as ores pure alloys metal that not mixed any materials listed periodic table e g fe cu zinc zn mixtures two or more formed together create new improved mechanical properties base brass stainless chromium alloy b ferrous non contain carbon do tin may slight traces contains primary is does classification can be divided into groups aluminum low medium high cast lead tool steels others extraction oxide three magnetite hematite taconite extracted using blast furnace steps washed crushed limestone coke mixture fed then melted product coal mainly convert...