Question

Stainless steel contains in addition to iron-nickel and chromium which imparts:
A) Hardness to the alloy
B) Tensile strength to the alloy.
C) Luster to the alloy.
D) None of these.

Answer 1

Hint: We know that stainless steels are an iron-based alloy that contains several alloying elements to prevent the iron from rusting and also to provide heat resistant properties. Different types of stainless steel contain elements such as carbon, nitrogen, aluminum, silicon, etc. in a different composition.

Complete step by step answer:
Modern stainless steel may contain nickel, niobium, molybdenum, and titanium in addition to iron, carbon, and chromium. Nickel, niobium, molybdenum, and Chromium improve the corrosion resistance of stainless steel. Thus, stainless steel in addition to iron-nickel and chromium gives tensile strength to the alloy.

$\therefore $ option (B) is correct

Note:
Let us see the elements and its purpose which is alloyed with stainless steel.
Carbon: Carbon is alloyed with iron to increase the hardness and strength of iron.
Manganese: Manganese is alloyed to steel to enhance the hot working properties and also to increase toughness and hardenability.
Chromium: Chromium is added to resist the oxidation of iron and the resistance increases with the amount chromium alloyed with the iron.
Nickel: Nickel is added to form the corrosion and heat-resisting steels.
Molybdenum: Molybdenum is added to chromium-nickel alloyed steel to enhance the resistance to pitting and crevice corrosion particularly in chloride and sulfur environments.
Titanium: Titanium is added to increase the carbide stabilization particularly if the material is welded and it reacts with carbon to form titanium carbides which are stable and hard to dissolve in steel.