Question

What is the percentage of carbon in hard steel?
A.$0.1$ to $0.4$
B.$1.5$ to $2.5$
C.$2.5$ to $3.5$
D.$0.5$to $1.5$

Answer 1

We have to know that, carbon steel is a typical sort of steel that is a combination of iron and carbon. It's anything but a higher carbon content, lower liquefying point and more prominent sturdiness contrasted with hardened steel. Carbon steel is a steel with carbon content from about $0.05$ up to $3.8$ percent by weight. The meaning of carbon steel from the american iron and steel institute states.

Complete answer:
We have to know that, the term carbon steel may likewise be utilized concerning steel which isn't tempered steel; in this utilization carbon steel may incorporate combination prepares. High carbon steel has various uses like processing machines, cutting instruments (like etches) and high strength wires. These applications require a lot better microstructure, which works on the strength.
As the carbon rate content increases, steel can get more diligently and more grounded through heat treating; nonetheless, it turns out to be less flexible. Despite the warmth treatment, a higher carbon content lessens weldability. In carbon prepares, the higher carbon content brings down the dissolving point.
Hard steel generally alludes to extinguished or extinguished and tempered steel.
The level of carbon in hard steel is $0.5$ to $1.5$ .

Therefore,the correct option is (D).

Note:
High-pliable prepares are low-carbon, or prepared at the lower end of the medium-carbon range, which have extra alloying fixings to expand their solidarity, wear properties or explicitly rigidity. These alloying fixings incorporate chromium, molybdenum, silicon, manganese, nickel, and vanadium. Debasements, for example, phosphorus and sulfur have their greatest passable substance limited.