By Gupta, H. N. Gupta, R. C. Mittal, Arun
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Extra resources for Manufacturing Processes, 2nd Edition
The property of red hardness comes from addition of tungsten. S. 75–1%, rest iron. Tungsten is a costly metal. It has been found that molybdenum can also impart ‘‘red hardness’’ to steel and actually half per cent of molybdenum can replace one per cent of tungsten. Molybdenum is far cheaper than tungsten. S. S. with molybdenum are known as M-series steels. S. has a composition of tungsten 6%, molybdenum 6%, chromium 4% and vanadium 2%, besides iron and carbon. S. is called super high speed steel.
In a rolling mill attached to a steel plant, the starting point is a cast ingot of steel which is broken down progressively into blooms, billets and slabs. The slabs are further hot rolled into plate, sheet, rod, bar, rails and other structural shapes like angles, channels etc. Conversion of steel into such commercially important sections is usually done in another rolling mill called merchant mill. 45 46 Manufacturing Processes Rolling is a very convenient and economical way of producing commercially important sections.
Composition: 1–4% Silicon, rest mainly copper. Possesses extremely good corrosion resistance. Can be cold worked and strain-hardened. Used for boiler fitting and marine fittings. (iii) Manganese bronze. Composition: 40% zinc and 55–60% copper with 3–5% manganese. It is essentially a brass to which manganese has been added. It is used for ship’s propellers. (iv) Beryllium bronze. Beryllium is very costly. So is this alloy. It contains about 2% Be. It has very good mechanical properties and can be cold worked and age-hardened.