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Phosphorus is added to steel mold for which of the following reason?

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in Casting-Forming-Welding I by (687k points)
Phosphorus is added to steel mold for which of the following reason?

(a) It increases strength and hardness of steel

(b) It increases refractoriness of steel

(c) It increases porosity of steel

(d) It increases finishing of steel

The question was posed to me in my homework.

Asked question is from Mold Materials topic in section Molding and Core Sands of Casting-Forming-Welding I

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Best answer
The correct choice is (a) It increases strength and hardness of steel

Best explanation: Phosphorus has the ability to increase strength and hardness of steel material when added to it in the right compostion (2-4%).

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