Engineering Materials
Tensile strength of steel can be safely increased by

Adding carbon up to 6.3%
Adding carbon up to 2.8%
Adding small quantities of copper
Adding carbon up to 0.83%

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Engineering Materials
Chromium in steel

Improves cutting ability and reduces hardenability
Refines grain size and produces less tendency to carburisation, improves corrosion and heat resistant properties
Gives ductility, toughness, tensile strength and anti-corrosion properties
Improves wear resistance, cutting ability and toughness

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