Chapter 8, Problem 1CQ

To determine

To fill in the blank with an appropriate word.

Answer to Problem 1CQ

In UNS system, the plain-carbon or low-alloy is designated with a letter G followed by five digits.

Explanation of Solution

Introduction:

Plain carbon or low alloy are the main materials that are used for building structures,bridges, automobiles etc. The main significant material of these alloys is carbon and sometimes manganese but in limited proportion (not more than $1.5\%$ ). The designation of the steel is given on the basis of type of alloy elements present in the steel.

The UNS system is used to designate the plain carbon or low alloy steels. The plain-carbon materials are designated by a number that starts with G followed by five digits.Out of five digits,the first four digits are same as of AISI/SAE designation.

For example, the AISI/SAE designation and UNS designation of the annealed steel is $1020$ and $\text{G10200}$ respectively.