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the hardness of iron decreases with increase in brittleness in general..
however when the temp is increased, the elasticity increases and the brittleness reduces, it continues to show the increasing trend in hardness until a transition temperature, after which the hardness starts decreasing again.
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The main difference between cast-iron and steel?
Steel is an alloy of carbon and iron. If the percentage of carbon is more than 2% then it is called cast iron.
What is the effect carbon content on steel?
Carbon is primary hardening element in steel. Hardness and tensile strength increases as carbon content increases upto 0.85%. Ductility and weldability decreases as carbon content increases. If the solution of carbon and liquid iron is solidified slowly the carbon tends to separate out in the form of graphite flakes (Grey cast iron). It is easily machinable. If the same iron is cast and colled quickly, it is hard and has a higher tensile strength, is difficult to machine (white cast iron).
Is malleable iron a cast iron or wrought iron?
Malleable means can be hammered. Cast iron will crack or break into pieces; it's not malleable. The word wrought means hammered. You could have used a dictionary for definitions; this isn't really an engineering question. The cast iron with carbon content of less than 0.2% is called wrought iron or pure iron. Wrought iron is very soft, plastic and easily deformed, but its strength and hardness are lower, so not widely used. Malleable cast iron is produced from white cast iron, which is made from hot liquid iron with certain chemical components. The white cast iron needs to be treated by malleablizing, such as graphitizing or oxidation and decarbonization, then its metallographic structures or chemical components will be changed, so can become into malleable cast iron. +++ So yes, Malleable Iron is a Cast Iron, but a much less brittle species enabling it to be used almost as a grade of steel. It is an important mechanical-engineering material. ' Wrought Iron was the ancestor of Mild Steel but became obsolete and no longer made, by the early 20C. It was very uneconomical, as well as very labour-intensive in very unpleasant conditions to make; and its internal structure and inconsistent quality rendered it totally unsuitable for the new engineering demands developing rapidly from the 1850s onwards.
What is the Indian standard of SG 500 7 grade cast iron?
This is Speroidal Graphite iron casting. Mechanical Properties required are as followed, Tensile Strength ( MPa ) - Min. 500 Min. 0.2 % Proof Stress ( MPa) - Min. 320 Elongation ( % ) - Min. 7 Brinell Hardness (BHN ) - 160-240 Predominant Constituent of Matrix - Ferrite + Pearlite. Regards, Sujit Doijad 09762225010 s.doijad@rediffmail.com
Is cast iron different from iron?
cast iron consists of 2% - 4% of carbon in it. cast iron is pig iron remelted and thereby refined together with definite amount of limestone,steel scrap, and spoiled castings. it consists of small % of sulphur, silicon,phosphorus and manganese wrought iron is highly refined iron with a small amount of slag forged out into fibres. it consists of 99% iron. it is almost the purest form of iron. it is highly ductile,rusts extremely quickly, it cannot be heat treated
