Monthly Archives: November 2009

Heat treatment of Metals (5)

ANNEALING The primary purpose of annealing is to soften hard steel so that it maybe machined or cold worked. This is usually accomplished by heating the steel to slightly above the critical temperature, holding it htere until the remperature of the piece is uniform throughout, and then cooling at a slowly controlled rate so that […]


Manhole Covers

Mothed: Sand Casting, Green Sand Casting or Resin Sand Casitng Material: Cast Ductile Iron, Cast Gray Iron. Standards: En124 Manhole covers (sometimes known as inspection covers) are the metal covers that are used to cover over large or small holes created in the road surface to gain access to the equipment underneath.

Manhole Cover Casting
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