Engineering Materials
The presence of hydrogen in steel causes

Corrosion resistance
Embrittlement
Reduced neutron absorption cross-section
Improved Weldability

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Engineering Materials
Aluminium bronze contains

92.5% aluminium, 4% copper, 2% nickel, and 1.5% Mg
90% magnesium and 9% aluminium with some copper
94% aluminium, 4% copper and 0.5% Mn, Mg, Si and Fe
10% aluminium and 90% copper

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Engineering Materials
In a hardening process, the hypo-eutectoid steel is

Heated from 30°C to 50°C above the upper critical temperature and then cooled suddenly in a suitable cooling medium
Heated from 30°C to 50°C above the upper critical temperature and then cooled in still air
Heated below or closes to the lower critical temperature and then cooled slowly
Heated from 30°C to 50°C above the upper critical temperature and then cooled slowly in the furnace

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Engineering Materials
The brown smoke during the operation of a Bessemer converter indicates that the

Silicon and manganese has burnt and carbon has started oxidizing
The converter must be titled to remove the contents of the converter
Air is burning out silicon and manganese
The brown smoke does not occur during the operation of a Bessemer converter

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