निम्नलिखित में से किसे इंजीनियरिंग सामग्रियों की मूलभूत संपत्ति श्रेणी के रूप में वर्गीकृत नहीं किया गया है?

Match the following alloying elements with their effects on the properties of steel: A. Copper - (iii) Improves corrosion resistance but reduces ductility B. Nickel - (i) Improves impact toughness and cold brittle tendency C. Manganese - (iv) Increases strength but reduces weldability D. Aluminium - (ii) Increases strength Select the correct match:

Which of the following is NOT an objective or function of alloying steel?