41⟩ What is bright steel?
Bright steel contains 0.05 to 0.45% carbon and up to 0.2%lead.It is used for making set screws, bolts, pins which withstand high loads at longer time.
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42⟩ What is fusibility?
It is the property of metal due to which a metal becomes fluid when it is heated.
43⟩ What is high speed steel?
High speed steel is an alloy of 18% tungsten, 4% chromium,1% vanadium,4%cobalt and 0.7% carbon. This is generally used for making machine tools like lathe ,planer, shaper, taps , drills and milling cutters.
44⟩ Tell us why are cast iron seasoned before machining?
For easy machining and saving the cutting edge of the tool.
45⟩ Tell us how will you identify cast iron, mild steel and high carbon steel?
By spark: When a metal is held against grinding wheel it gives sparks. Cast iron gives thick and short sparks. Mild steel gives medium and dense sparks and High carbon steel gives long and dense sparks.
By hammering : When a blow of hammer is given with these metals there will be a deep spot on mild steel, less deep spot on high carbon steel and cast iron may break.
46⟩ Tell us why Is The Most Of Cutting Tools Made Out In H.s.s?
Because it resist the heat on the cutting edge of tool and it smoothly work in high speed.
47⟩ Tell me why Are Cast Iron Seasoned Before Machining?
For easy machining and saving the cutting edge of the tool.
48⟩ Tell me how does carbon affects the properties of steel?
If carbon content is higher the degree of hardness is more and the melting point is lower, If carbon percentage is lower it is easy to forging and forge welding.
