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 […]
Tempering is possible because of the instability of the martensite, the principal constituent of hardened steel. Low temperature draws, from 300′ F to 400’F (150′ – 205′ C)
Method: Sand Casting, Resin Sand Casting Material: Gray Iron , Ductile Iron Good surface finish and strictly dimension control
ASTM A48 / A48M – 03(2008) Standard Specification for Gray Iron Castings, casting material standard.
HARDENING Hardening is the process of heating a piece of steel to a temperature within or above its critcal range and then cooling it in rapidly. If the carbon content of the steel is known, the proper temperature to which the steel should be heated may be obtained by reference to the iron – iron […]
Ductile iron, also called ductile cast iron, spheroidal graphite iron, or nodular cast iron. While most varieties of cast iron are brittle, ductile iron is much more flexible and elastic, due to its nodular graphite inclusions.
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.