Final Material Used

Final Material

We will be using HSLA(High Strength low-alloy Steel) to manufacture our crane. It provides better mechanical properties or more resistance to corrosion as compared to carbon steel. HSLA steels vary from other steels as they are made to meet a specific mechanical property and not to a specific chemical property. It has small amount of alloying elements like copper,nickel , nitrogen, vanadium, chromium, molybdenum, titanium, calcium, rare earth elements . These elements are intended to alter the microstructure of carbon steels, which is usually a ferrite-pearlite aggregate, to produce a very fine dispersion of alloycarbides in an almost pure ferrite matrix. This eliminates the toughness-reducing effect of a pearlitic volume fraction, yet maintains and increases the material's strength by refining the grain size, which in the case of ferrite increases yield strength by 50% for every halving of the mean grain diameter. The yield strength of HSLA steel lies between 250-590 megapascal. HSLA steels require around 30% more power to form as compared to carbon steels because of its great strength.
To increase corrosion resistance elements like Copper, silicon, chromium, nickel and phosphorus are added. Increased formability is needed because HSLA steels have directionally sensitive properties. Impact Strength and formability vary significantly when tested transversely and longitudinally to the grain. HSLA steels when treated for sulphide shape control have directional characteristic reduced substantially.
HSLA steels are lighter as compared to carbon steel with same strength and due to fine layer of ferrite (almost pure iron) and cementite in pearlite HSLA steels are more resistant to rust than most carbon steel