Question

1.SAE1020 means that .....
2 points
). A) Carbon content is 10%
B) Carbon content is 20%
C) Carbon steel with carbon content
10%
D) Carbon steel with carbon content
20%​

Answer 1

SAE1020 means that Carbon steel with carbon content

20%

Explanation:

• Carbon steel grade SAE 1020 is a low hardness and low tensile strength alloy.

• Chemical composition of Carbon steel SAE 1020, C=0.20%, Mn=0.45%, P=0.04% max, S=0.05% max

Answer 2

The correct answer for the given question is option D: Carbon steel with a carbon content of 20%.

• The alphanumeric letters given in the question represent the nomenclature system for alloys and steel. It is given by the Society of Automotive Engineers (SAE).
• The nomenclature comprises of numerals combination of four-digit which denotes the materials used in alloy and its composition.
• The steel's main material is represented by the first digit. The numeral value "1" in 1020 denotes that it is Carbon steel.
• The secondary components added or mixed in alloy denote the second digit. According to the 1020 nomenclature, "0" indicates that no such material has been added or mixed in the alloy.
• The last two digits represent the overall carbon content or its amount mixed in the alloy. The number "20" refers to the carbon content of the alloy, which is 0.20 percent.